remove voice code make optimizations. Fix channels race conditions. add reply function

android/app/src/main/AndroidManifest.xml

@@ -16,8 +16,6 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
-    <!-- Microphone permission (required for voice messages) -->
-    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
 
     <application
         android:label="meshcore_open"

ios/Runner/Info.plist

@@ -53,7 +53,5 @@
 	<string>This app uses Bluetooth to communicate with MeshCore devices.</string>
 	<key>NSBluetoothPeripheralUsageDescription</key>
 	<string>This app uses Bluetooth to communicate with MeshCore devices.</string>
-	<key>NSMicrophoneUsageDescription</key>
-	<string>This app needs microphone access to record voice messages.</string>
 </dict>
 </plist>

lib/connector/meshcore_connector.dart

@@ -21,7 +21,6 @@ import '../services/path_history_service.dart';
 import '../services/app_settings_service.dart';
 import '../services/background_service.dart';
 import '../services/notification_service.dart';
-import '../services/voice_message_service.dart';
 import '../storage/channel_message_store.dart';
 import '../storage/channel_order_store.dart';
 import '../storage/channel_settings_store.dart';
@@ -46,6 +45,9 @@ enum MeshCoreConnectionState {
 }
 
 class MeshCoreConnector extends ChangeNotifier {
+  // Message windowing to limit memory usage
+  static const int _messageWindowSize = 200;
+
   MeshCoreConnectionState _state = MeshCoreConnectionState.disconnected;
   BluetoothDevice? _device;
   BluetoothCharacteristic? _rxCharacteristic;
@@ -113,9 +115,6 @@ class MeshCoreConnector extends ChangeNotifier {
   final ContactSettingsStore _contactSettingsStore = ContactSettingsStore();
   final ContactStore _contactStore = ContactStore();
   final UnreadStore _unreadStore = UnreadStore();
-  final VoiceMessageService _voiceMessageService = VoiceMessageService.instance;
-  final Map<String, _VoiceAssembly> _voiceAssemblies = {};
-  _VoiceSendSession? _voiceSendSession;
   final Map<int, bool> _channelSmazEnabled = {};
   final Map<String, bool> _contactSmazEnabled = {};
   final Set<String> _knownContactKeys = {};
@@ -124,23 +123,13 @@ class MeshCoreConnector extends ChangeNotifier {
   String? _activeContactKey;
   int? _activeChannelIndex;
   List<int> _channelOrder = [];
-  int _lastVoiceTimestampSeconds = 0;
 
   // Getters
   MeshCoreConnectionState get state => _state;
   BluetoothDevice? get device => _device;
   String? get deviceId => _deviceId;
   String get deviceIdLabel => _deviceId ?? 'Unknown';
-  bool get isVoiceSending => _voiceSendSession != null;
 
-  void cancelVoiceSend() {
-    final session = _voiceSendSession;
-    if (session == null) return;
-    session.cancel();
-    _voiceSendSession = null;
-    _updateVoiceMessageStatus(session.messageId, MessageStatus.failed);
-    notifyListeners();
-  }
   String get deviceDisplayName {
     if (_selfName != null && _selfName!.isNotEmpty) {
       return _selfName!;
@@ -227,12 +216,6 @@ class MeshCoreConnector extends ChangeNotifier {
     if (messages == null) return;
     final removed = messages.remove(message);
     if (!removed) return;
-    if (message.isVoice && message.voicePath != null) {
-      final file = File(message.voicePath!);
-      if (await file.exists()) {
-        await file.delete();
-      }
-    }
     await _messageStore.saveMessages(contactKeyHex, messages);
     notifyListeners();
   }
@@ -241,13 +224,43 @@ class MeshCoreConnector extends ChangeNotifier {
     if (_loadedConversationKeys.contains(contactKeyHex)) return;
     _loadedConversationKeys.add(contactKeyHex);
 
-    final messages = await _messageStore.loadMessages(contactKeyHex);
+    final allMessages = await _messageStore.loadMessages(contactKeyHex);
-    if (messages.isNotEmpty) {
+    if (allMessages.isNotEmpty) {
-      _conversations[contactKeyHex] = messages;
+      // Keep only the most recent N messages in memory to bound memory usage
+      final windowedMessages = allMessages.length > _messageWindowSize
+          ? allMessages.sublist(allMessages.length - _messageWindowSize)
+          : allMessages;
+
+      _conversations[contactKeyHex] = windowedMessages;
       notifyListeners();
     }
   }
 
+  /// Load older messages for a contact (pagination)
+  Future<List<Message>> loadOlderMessages(
+    String contactKeyHex, {
+    int count = 50,
+  }) async {
+    final allMessages = await _messageStore.loadMessages(contactKeyHex);
+    final currentMessages = _conversations[contactKeyHex] ?? [];
+
+    if (allMessages.length <= currentMessages.length) {
+      return []; // No more messages to load
+    }
+
+    final currentOffset = allMessages.length - currentMessages.length;
+    final fetchCount = count.clamp(0, currentOffset);
+    final startIndex = currentOffset - fetchCount;
+
+    final olderMessages = allMessages.sublist(startIndex, currentOffset);
+
+    // Prepend to current conversation
+    _conversations[contactKeyHex] = [...olderMessages, ...currentMessages];
+    notifyListeners();
+
+    return olderMessages;
+  }
+
   List<ChannelMessage> getChannelMessages(Channel channel) {
     return _channelMessages[channel.index] ?? [];
   }
@@ -376,13 +389,43 @@ class MeshCoreConnector extends ChangeNotifier {
 
   /// Load persisted channel messages for a specific channel
   Future<void> _loadChannelMessages(int channelIndex) async {
-    final messages = await _channelMessageStore.loadChannelMessages(channelIndex);
+    final allMessages = await _channelMessageStore.loadChannelMessages(channelIndex);
-    if (messages.isNotEmpty) {
+    if (allMessages.isNotEmpty) {
-      _channelMessages[channelIndex] = messages;
+      // Keep only the most recent N messages in memory to bound memory usage
+      final windowedMessages = allMessages.length > _messageWindowSize
+          ? allMessages.sublist(allMessages.length - _messageWindowSize)
+          : allMessages;
+
+      _channelMessages[channelIndex] = windowedMessages;
       notifyListeners();
     }
   }
 
+  /// Load older channel messages (pagination)
+  Future<List<ChannelMessage>> loadOlderChannelMessages(
+    int channelIndex, {
+    int count = 50,
+  }) async {
+    final allMessages = await _channelMessageStore.loadChannelMessages(channelIndex);
+    final currentMessages = _channelMessages[channelIndex] ?? [];
+
+    if (allMessages.length <= currentMessages.length) {
+      return []; // No more messages to load
+    }
+
+    final currentOffset = allMessages.length - currentMessages.length;
+    final fetchCount = count.clamp(0, currentOffset);
+    final startIndex = currentOffset - fetchCount;
+
+    final olderMessages = allMessages.sublist(startIndex, currentOffset);
+
+    // Prepend to current conversation
+    _channelMessages[channelIndex] = [...olderMessages, ...currentMessages];
+    notifyListeners();
+
+    return olderMessages;
+  }
+
   /// Load all persisted channel messages on startup
   Future<void> loadAllChannelMessages({int? maxChannels}) async {
     final channelCount = maxChannels ?? _maxChannels;
@@ -876,16 +919,10 @@ class MeshCoreConnector extends ChangeNotifier {
     int? customPathLen,
   }) async {
     if (!isConnected || text.isEmpty) return;
-    if (_voiceSendSession != null) {
-      debugPrint('Voice send in progress, skipping text send.');
-      return;
-    }
 
     // If custom path is provided, temporarily update the contact's path
     if (customPath != null && customPathLen != null && customPathLen >= 0) {
       await setContactPath(contact, customPath, customPathLen);
-      // Small delay to ensure the path update is processed
-      await Future.delayed(const Duration(milliseconds: 50));
     }
 
     PathSelection? autoSelection;
@@ -901,7 +938,6 @@ class MeshCoreConnector extends ChangeNotifier {
             Uint8List.fromList(autoSelection.pathBytes),
             autoSelection.pathBytes.length,
           );
-          await Future.delayed(const Duration(milliseconds: 50));
         }
       }
     }
@@ -943,143 +979,11 @@ class MeshCoreConnector extends ChangeNotifier {
     }
   }
 
-  Future<void> sendVoiceMessage({
+  Future<void> setContactPath(
-    required Contact contact,
+    Contact contact,
-    required Uint8List codec2Bytes,
+    Uint8List customPath,
-    required String voicePath,
+    int pathLen,
-    required int durationMs,
+  ) async {
-    int? timestampSeconds,
-  }) async {
-    if (!isConnected || codec2Bytes.isEmpty) return;
-    if (_voiceSendSession != null) return;
-
-    final voiceTimestampSeconds = timestampSeconds ?? _nextVoiceTimestampSeconds();
-    final chunks = _voiceMessageService.buildVoiceChunks(codec2Bytes);
-    if (chunks.isEmpty) return;
-
-    final messageId = const Uuid().v4();
-    final message = Message(
-      senderKey: contact.publicKey,
-      text: 'Voice message',
-      timestamp: DateTime.fromMillisecondsSinceEpoch(voiceTimestampSeconds * 1000),
-      isOutgoing: true,
-      isCli: false,
-      status: MessageStatus.pending,
-      messageId: messageId,
-      forceFlood: false,
-      isVoice: true,
-      voicePath: voicePath,
-      voiceDurationMs: durationMs,
-      voiceCodec: VoiceMessageService.codecName,
-    );
-
-    _addMessage(contact.publicKeyHex, message);
-    notifyListeners();
-
-    final session = _VoiceSendSession(
-      contact: contact,
-      messageId: messageId,
-      chunks: chunks,
-      timestampSeconds: voiceTimestampSeconds,
-    );
-    _voiceSendSession = session;
-    notifyListeners();
-
-    unawaited(_sendVoiceChunks(session));
-  }
-
-  int reserveVoiceTimestampSeconds() {
-    return _nextVoiceTimestampSeconds();
-  }
-
-  int _nextVoiceTimestampSeconds() {
-    final nowSeconds = DateTime.now().millisecondsSinceEpoch ~/ 1000;
-    if (nowSeconds <= _lastVoiceTimestampSeconds) {
-      _lastVoiceTimestampSeconds += 1;
-    } else {
-      _lastVoiceTimestampSeconds = nowSeconds;
-    }
-    return _lastVoiceTimestampSeconds;
-  }
-
-  Future<void> _sendVoiceChunks(_VoiceSendSession session) async {
-    for (var i = 0; i < session.chunks.length; i++) {
-      if (session.isCancelled) return;
-      final ok = await _sendVoiceChunk(session, i);
-      if (!ok) {
-        if (session.isCancelled) return;
-        _updateVoiceMessageStatus(session.messageId, MessageStatus.failed);
-        _voiceSendSession = null;
-        notifyListeners();
-        return;
-      }
-    }
-    if (session.isCancelled) return;
-    _updateVoiceMessageStatus(session.messageId, MessageStatus.delivered);
-    _voiceSendSession = null;
-    notifyListeners();
-  }
-
-  Future<bool> _sendVoiceChunk(_VoiceSendSession session, int index) async {
-    if (session.isCancelled) return false;
-    session.beginChunk(index);
-    await sendFrame(
-      buildSendTextMsgFrame(
-        session.contact.publicKey,
-        session.chunks[index],
-        forceFlood: false,
-        attempt: 0,
-        timestampSeconds: session.timestampSeconds,
-      ),
-    );
-
-    try {
-      await session.sentCompleter!.future.timeout(const Duration(seconds: 10));
-    } catch (_) {
-      return false;
-    }
-
-    final timeoutMs = session.expectedTimeoutMs;
-    final confirmTimeout = timeoutMs != null && timeoutMs > 0
-        ? Duration(milliseconds: timeoutMs)
-        : const Duration(seconds: 30);
-
-    try {
-      await session.confirmCompleter!.future.timeout(confirmTimeout);
-    } catch (_) {
-      return false;
-    }
-    return true;
-  }
-
-  void _updateVoiceMessageStatus(String messageId, MessageStatus status) {
-    for (final entry in _conversations.entries) {
-      final messages = entry.value;
-      final index = messages.indexWhere((m) => m.messageId == messageId);
-      if (index == -1) continue;
-      messages[index] = messages[index].copyWith(status: status);
-      _messageStore.saveMessages(entry.key, messages);
-      break;
-    }
-  }
-
-  void _handleVoiceMessageSent(Uint8List ackHash, int timeoutMs, {required bool isFlood}) {
-    final session = _voiceSendSession;
-    if (session == null) return;
-    session.handleSent(ackHash, timeoutMs);
-    if (isFlood) {
-      // Flooded sends may not emit send-confirmed; unblock voice chunking.
-      session.handleConfirmed(ackHash);
-    }
-  }
-
-  void _handleVoiceSendConfirmed(Uint8List ackHash) {
-    final session = _voiceSendSession;
-    if (session == null) return;
-    session.handleConfirmed(ackHash);
-  }
-
-  Future<void> setContactPath(Contact contact, Uint8List customPath, int pathLen) async {
     if (!isConnected) return;
 
     await sendFrame(buildUpdateContactPathFrame(
@@ -1091,12 +995,8 @@ class MeshCoreConnector extends ChangeNotifier {
     ));
   }
 
-  Future<void> sendChannelMessage(Channel channel, String text) async {
+  Future<void> sendChannelMessage(Channel channel, String text) async{
     if (!isConnected || text.isEmpty) return;
-    if (_voiceSendSession != null) {
-      debugPrint('Voice send in progress, skipping channel send.');
-      return;
-    }
 
     final message = ChannelMessage.outgoing(text, _selfName ?? 'Me', channel.index);
     _addChannelMessage(channel.index, message);
@@ -1120,9 +1020,9 @@ class MeshCoreConnector extends ChangeNotifier {
     _conversations.remove(contact.publicKeyHex);
     _loadedConversationKeys.remove(contact.publicKeyHex);
     _contactLastReadMs.remove(contact.publicKeyHex);
-    unawaited(_unreadStore.saveContactLastRead(
+    _unreadStore.saveContactLastRead(
       Map<String, int>.from(_contactLastReadMs),
-    ));
+    );
     _messageStore.clearMessages(contact.publicKeyHex);
     notifyListeners();
   }
@@ -1250,9 +1150,9 @@ class MeshCoreConnector extends ChangeNotifier {
     // Delete by setting empty name and zero PSK
     await sendFrame(buildSetChannelFrame(index, '', Uint8List(16)));
     _channelLastReadMs.remove(index);
-    unawaited(_unreadStore.saveChannelLastRead(
+    _unreadStore.saveChannelLastRead(
       Map<int, int>.from(_channelLastReadMs),
-    ));
+    );
     // Refresh channels after deleting
     await getChannels();
   }
@@ -1505,9 +1405,9 @@ class MeshCoreConnector extends ChangeNotifier {
     if (contact != null) {
       if (contact.type == advTypeRepeater) {
         _contactLastReadMs.remove(contact.publicKeyHex);
-        unawaited(_unreadStore.saveContactLastRead(
+        _unreadStore.saveContactLastRead(
           Map<String, int>.from(_contactLastReadMs),
-        ));
+        );
       }
       // Check if this is a new contact
       final isNewContact = !_knownContactKeys.contains(contact.publicKeyHex);
@@ -1656,9 +1556,6 @@ class MeshCoreConnector extends ChangeNotifier {
           pathBytes: contact.pathLength < 0 ? Uint8List(0) : contact.path,
         );
       }
-      if (_tryHandleVoiceChunk(message)) {
-        return;
-      }
       if (contact != null) {
         _updateContactLastMessageAt(contact.publicKeyHex, message.timestamp);
       }
@@ -1784,124 +1681,9 @@ class MeshCoreConnector extends ChangeNotifier {
     return text;
   }
 
-  bool _tryHandleVoiceChunk(Message message) {
-    if (message.isOutgoing || message.isCli) return false;
-    final chunk = _voiceMessageService.tryParseChunk(message.text);
-    if (chunk == null) return false;
-    _updateContactLastMessageAt(
-      message.senderKeyHex,
-      message.timestamp,
-      notify: true,
-    );
-    final timestampSeconds = message.timestamp.millisecondsSinceEpoch ~/ 1000;
-    final key = _voiceAssemblyKey(message.senderKeyHex, timestampSeconds);
-    final assembly = _voiceAssemblies.putIfAbsent(
-      key,
-      () => _VoiceAssembly(
-        senderKey: message.senderKey,
-        senderKeyHex: message.senderKeyHex,
-        timestampSeconds: timestampSeconds,
-        totalChunks: chunk.count,
-      ),
-    );
-    if (assembly.totalChunks != chunk.count) {
-      _voiceAssemblies.remove(key);
-      return true;
-    }
-    assembly.addChunk(chunk);
-    if (assembly.isComplete) {
-      _voiceAssemblies.remove(key);
-      unawaited(_finalizeVoiceAssembly(assembly, message));
-    }
-    _cleanupVoiceAssemblies();
-    if (_isSyncingQueuedMessages) {
-      _handleQueuedMessageReceived();
-    }
-    return true;
-  }
 
-  String _voiceAssemblyKey(String senderKeyHex, int timestampSeconds) {
-    return '$senderKeyHex:$timestampSeconds';
-  }
 
-  Future<void> _finalizeVoiceAssembly(_VoiceAssembly assembly, Message chunkMessage) async {
-    final codec2Bytes = assembly.assemble();
-    if (codec2Bytes.isEmpty) return;
-    final existing = _conversations[assembly.senderKeyHex];
-    if (existing != null) {
-      final alreadyAdded = existing.any((message) {
-        if (!message.isVoice) return false;
-        final tsSeconds = message.timestamp.millisecondsSinceEpoch ~/ 1000;
-        return tsSeconds == assembly.timestampSeconds;
-      });
-      if (alreadyAdded) return;
-    }
-    String? filePath;
-    int durationMs = 0;
-    try {
-      final pcmBytes = _voiceMessageService.decodeCodec2ToPcm(codec2Bytes);
-      durationMs = _voiceMessageService.durationMsForCodec2Bytes(codec2Bytes);
-      final fileName = _voiceMessageService.buildVoiceFileName(
-        senderKeyHex: assembly.senderKeyHex,
-        timestampSeconds: assembly.timestampSeconds,
-      );
-      filePath = await _voiceMessageService.writeWavFile(
-        pcmBytes: pcmBytes,
-        fileName: fileName,
-      );
-    } catch (e) {
-      debugPrint('Voice decode failed: $e');
-      return;
-    }
 
-    final message = Message(
-      senderKey: assembly.senderKey,
-      text: 'Voice message',
-      timestamp: DateTime.fromMillisecondsSinceEpoch(assembly.timestampSeconds * 1000),
-      isOutgoing: false,
-      isCli: false,
-      status: MessageStatus.delivered,
-      isVoice: true,
-      voicePath: filePath,
-      voiceDurationMs: durationMs,
-      voiceCodec: VoiceMessageService.codecName,
-      pathLength: chunkMessage.pathLength,
-      pathBytes: chunkMessage.pathBytes,
-    );
-
-    _addMessage(assembly.senderKeyHex, message);
-    _maybeMarkActiveContactRead(message);
-    notifyListeners();
-
-    if (_appSettingsService != null) {
-      final settings = _appSettingsService!.settings;
-      if (settings.notificationsEnabled && settings.notifyOnNewMessage) {
-        final contact = _contacts.cast<Contact?>().firstWhere(
-          (c) => c != null && c.publicKeyHex == assembly.senderKeyHex,
-          orElse: () => null,
-        );
-        _notificationService.showMessageNotification(
-          contactName: contact?.name ?? 'Unknown',
-          message: 'Voice message',
-          contactId: assembly.senderKeyHex,
-        );
-      }
-    }
-  }
-
-  void _cleanupVoiceAssemblies() {
-    if (_voiceAssemblies.isEmpty) return;
-    final cutoff = DateTime.now().subtract(const Duration(minutes: 3));
-    final expiredKeys = <String>[];
-    for (final entry in _voiceAssemblies.entries) {
-      if (entry.value.startedAt.isBefore(cutoff)) {
-        expiredKeys.add(entry.key);
-      }
-    }
-    for (final key in expiredKeys) {
-      _voiceAssemblies.remove(key);
-    }
-  }
 
   String _channelDisplayName(int channelIndex) {
     for (final channel in _channels) {
@@ -2030,7 +1812,6 @@ class MeshCoreConnector extends ChangeNotifier {
       if (_retryService != null) {
         _retryService!.updateMessageFromSent(ackHash, timeoutMs);
       }
-      _handleVoiceMessageSent(ackHash, timeoutMs, isFlood: isFlood);
     } else {
       // Fallback to old behavior
       for (var messages in _conversations.values) {
@@ -2059,7 +1840,6 @@ class MeshCoreConnector extends ChangeNotifier {
       if (_retryService != null) {
         _retryService!.handleAckReceived(ackHash, tripTimeMs);
       }
-      _handleVoiceSendConfirmed(ackHash);
     } else {
       // Fallback to old behavior
       for (var messages in _conversations.values) {
@@ -2138,9 +1918,9 @@ class MeshCoreConnector extends ChangeNotifier {
     final existing = _contactLastReadMs[contactKeyHex] ?? 0;
     if (timestampMs <= existing) return;
     _contactLastReadMs[contactKeyHex] = timestampMs;
-    unawaited(_unreadStore.saveContactLastRead(
+    _unreadStore.saveContactLastRead(
       Map<String, int>.from(_contactLastReadMs),
-    ));
+    );
     if (notify) {
       notifyListeners();
     }
@@ -2150,9 +1930,9 @@ class MeshCoreConnector extends ChangeNotifier {
     final existing = _channelLastReadMs[channelIndex] ?? 0;
     if (timestampMs <= existing) return;
     _channelLastReadMs[channelIndex] = timestampMs;
-    unawaited(_unreadStore.saveChannelLastRead(
+    _unreadStore.saveChannelLastRead(
       Map<int, int>.from(_channelLastReadMs),
-    ));
+    );
     if (notify) {
       notifyListeners();
     }
@@ -2306,16 +2086,48 @@ class MeshCoreConnector extends ChangeNotifier {
   bool _addChannelMessage(int channelIndex, ChannelMessage message) {
     _channelMessages.putIfAbsent(channelIndex, () => []);
     final messages = _channelMessages[channelIndex]!;
-    final existingIndex = _findChannelRepeatIndex(messages, message);
+
+    // Parse reply info from message text
+    final replyInfo = ChannelMessage.parseReplyMention(message.text);
+    ChannelMessage processedMessage = message;
+
+    if (replyInfo != null) {
+      // Find original message by sender name (most recent match)
+      final originalMessage = _findMessageBySender(messages, replyInfo.mentionedNode);
+
+      if (originalMessage != null) {
+        // Create new message with reply metadata
+        processedMessage = ChannelMessage(
+          senderKey: message.senderKey,
+          senderName: message.senderName,
+          text: replyInfo.actualMessage,
+          timestamp: message.timestamp,
+          isOutgoing: message.isOutgoing,
+          status: message.status,
+          repeats: message.repeats,
+          repeatCount: message.repeatCount,
+          pathLength: message.pathLength,
+          pathBytes: message.pathBytes,
+          pathVariants: message.pathVariants,
+          channelIndex: message.channelIndex,
+          messageId: message.messageId,
+          replyToMessageId: originalMessage.messageId,
+          replyToSenderName: originalMessage.senderName,
+          replyToText: originalMessage.text,
+        );
+      }
+    }
+
+    final existingIndex = _findChannelRepeatIndex(messages, processedMessage);
     var isNew = true;
     if (existingIndex >= 0) {
       isNew = false;
       final existing = messages[existingIndex];
-      final mergedPathBytes = _selectPreferredPathBytes(existing.pathBytes, message.pathBytes);
+      final mergedPathBytes = _selectPreferredPathBytes(existing.pathBytes, processedMessage.pathBytes);
-      final mergedPathVariants = _mergePathVariants(existing.pathVariants, message.pathVariants);
+      final mergedPathVariants = _mergePathVariants(existing.pathVariants, processedMessage.pathVariants);
       final mergedPathLength = _mergePathLength(
         existing.pathLength,
-        message.pathLength,
+        processedMessage.pathLength,
         mergedPathBytes.length,
       );
       messages[existingIndex] = existing.copyWith(
@@ -2325,7 +2137,7 @@ class MeshCoreConnector extends ChangeNotifier {
         pathVariants: mergedPathVariants,
       );
     } else {
-      messages.add(message);
+      messages.add(processedMessage);
     }
 
     // Save to persistent storage
@@ -2336,6 +2148,16 @@ class MeshCoreConnector extends ChangeNotifier {
     return isNew;
   }
 
+  ChannelMessage? _findMessageBySender(List<ChannelMessage> messages, String mentionedNode) {
+    // Search backwards for most recent message from this sender
+    for (int i = messages.length - 1; i >= 0; i--) {
+      if (messages[i].senderName == mentionedNode && !messages[i].isOutgoing) {
+        return messages[i];
+      }
+    }
+    return null;
+  }
+
   int _findChannelRepeatIndex(List<ChannelMessage> messages, ChannelMessage incoming) {
     for (int i = messages.length - 1; i >= 0; i--) {
       final existing = messages[i];
@@ -2456,8 +2278,6 @@ class MeshCoreConnector extends ChangeNotifier {
     _maxChannels = _defaultMaxChannels;
     _isSyncingQueuedMessages = false;
     _queuedMessageSyncInFlight = false;
-    _voiceAssemblies.clear();
-    _voiceSendSession = null;
 
     _setState(MeshCoreConnectionState.disconnected);
     _scheduleReconnect();
@@ -2477,6 +2297,10 @@ class MeshCoreConnector extends ChangeNotifier {
     _notifySubscription?.cancel();
     _reconnectTimer?.cancel();
     _receivedFramesController.close();
+
+    // Flush pending unread writes before disposal
+    _unreadStore.flush();
+
     super.dispose();
   }
 }
@@ -2525,92 +2349,4 @@ class _ParsedText {
   });
 }
 
-class _VoiceAssembly {
-  _VoiceAssembly({
-    required this.senderKey,
-    required this.senderKeyHex,
-    required this.timestampSeconds,
-    required this.totalChunks,
-  });
 
-  final Uint8List senderKey;
-  final String senderKeyHex;
-  final int timestampSeconds;
-  final int totalChunks;
-  final DateTime startedAt = DateTime.now();
-  final Map<int, Uint8List> _chunks = {};
-
-  bool get isComplete => _chunks.length == totalChunks;
-
-  void addChunk(VoiceChunk chunk) {
-    _chunks.putIfAbsent(chunk.index, () => chunk.bytes);
-  }
-
-  Uint8List assemble() {
-    if (!isComplete) return Uint8List(0);
-    final builder = BytesBuilder(copy: false);
-    for (var i = 0; i < totalChunks; i++) {
-      final part = _chunks[i];
-      if (part == null) return Uint8List(0);
-      builder.add(part);
-    }
-    return builder.takeBytes();
-  }
-}
-
-class _VoiceSendSession {
-  _VoiceSendSession({
-    required this.contact,
-    required this.messageId,
-    required this.chunks,
-    required this.timestampSeconds,
-  });
-
-  final Contact contact;
-  final String messageId;
-  final List<String> chunks;
-  final int timestampSeconds;
-
-  int currentChunkIndex = -1;
-  Uint8List? expectedAckHash;
-  int? expectedTimeoutMs;
-  Completer<void>? sentCompleter;
-  Completer<void>? confirmCompleter;
-  bool _cancelled = false;
-
-  bool get isCancelled => _cancelled;
-
-  void beginChunk(int index) {
-    currentChunkIndex = index;
-    expectedAckHash = null;
-    expectedTimeoutMs = null;
-    sentCompleter = Completer<void>();
-    confirmCompleter = Completer<void>();
-  }
-
-  void handleSent(Uint8List ackHash, int timeoutMs) {
-    if (sentCompleter == null || sentCompleter!.isCompleted) return;
-    expectedAckHash = Uint8List.fromList(ackHash);
-    expectedTimeoutMs = timeoutMs > 0 ? timeoutMs : null;
-    sentCompleter!.complete();
-  }
-
-  void handleConfirmed(Uint8List ackHash) {
-    if (confirmCompleter == null || confirmCompleter!.isCompleted) return;
-    final expected = expectedAckHash;
-    if (expected == null) return;
-    if (!listEquals(expected, ackHash)) return;
-    confirmCompleter!.complete();
-  }
-
-  void cancel() {
-    if (_cancelled) return;
-    _cancelled = true;
-    if (sentCompleter != null && !sentCompleter!.isCompleted) {
-      sentCompleter!.completeError(StateError('cancelled'));
-    }
-    if (confirmCompleter != null && !confirmCompleter!.isCompleted) {
-      confirmCompleter!.completeError(StateError('cancelled'));
-    }
-  }
-}

lib/main.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import 'package:media_kit_fork/media_kit_fork.dart';
 
 import 'connector/meshcore_connector.dart';
 import 'screens/scanner_screen.dart';
@@ -12,10 +11,13 @@ import 'services/notification_service.dart';
 import 'services/ble_debug_log_service.dart';
 import 'services/background_service.dart';
 import 'services/map_tile_cache_service.dart';
+import 'storage/prefs_manager.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  MediaKit.ensureInitialized();
+
+  // Initialize SharedPreferences cache
+  await PrefsManager.initialize();
 
   // Initialize services
   final storage = StorageService();

lib/models/channel_message.dart

@@ -34,6 +34,10 @@ class ChannelMessage {
   final Uint8List pathBytes;
   final List<Uint8List> pathVariants;
   final int? channelIndex;
+  final String messageId;
+  final String? replyToMessageId;
+  final String? replyToSenderName;
+  final String? replyToText;
 
   ChannelMessage({
     this.senderKey,
@@ -48,7 +52,12 @@ class ChannelMessage {
     Uint8List? pathBytes,
     List<Uint8List>? pathVariants,
     this.channelIndex,
-  })  : pathBytes = pathBytes ?? Uint8List(0),
+    String? messageId,
+    this.replyToMessageId,
+    this.replyToSenderName,
+    this.replyToText,
+  })  : messageId = messageId ?? '${timestamp.millisecondsSinceEpoch}_${senderName.hashCode}_${text.hashCode}',
+        pathBytes = pathBytes ?? Uint8List(0),
         pathVariants = _mergePathVariants(
           pathBytes ?? Uint8List(0),
           pathVariants,
@@ -63,6 +72,9 @@ class ChannelMessage {
     int? pathLength,
     Uint8List? pathBytes,
     List<Uint8List>? pathVariants,
+    String? replyToMessageId,
+    String? replyToSenderName,
+    String? replyToText,
   }) {
     return ChannelMessage(
       senderKey: senderKey,
@@ -77,6 +89,10 @@ class ChannelMessage {
       pathBytes: pathBytes ?? this.pathBytes,
       pathVariants: pathVariants ?? this.pathVariants,
       channelIndex: channelIndex,
+      messageId: messageId,
+      replyToMessageId: replyToMessageId ?? this.replyToMessageId,
+      replyToSenderName: replyToSenderName ?? this.replyToSenderName,
+      replyToText: replyToText ?? this.replyToText,
     );
   }
 
@@ -207,4 +223,24 @@ class ChannelMessage {
     }
     return true;
   }
+
+  static ReplyInfo? parseReplyMention(String text) {
+    final regex = RegExp(r'^@\[([^\]]+)\]\s+(.+)$', dotAll: true);
+    final match = regex.firstMatch(text);
+    if (match == null) return null;
+    return ReplyInfo(
+      mentionedNode: match.group(1)!,
+      actualMessage: match.group(2)!,
+    );
+  }
+}
+
+class ReplyInfo {
+  final String mentionedNode;
+  final String actualMessage;
+
+  ReplyInfo({
+    required this.mentionedNode,
+    required this.actualMessage,
+  });
 }

lib/models/message.dart

@@ -10,10 +10,6 @@ class Message {
   final bool isOutgoing;
   final bool isCli;
   final MessageStatus status;
-  final bool isVoice;
-  final String? voicePath;
-  final int? voiceDurationMs;
-  final String? voiceCodec;
 
   // NEW: Retry logic fields
   final String? messageId;
@@ -34,10 +30,6 @@ class Message {
     required this.isOutgoing,
     this.isCli = false,
     this.status = MessageStatus.pending,
-    this.isVoice = false,
-    this.voicePath,
-    this.voiceDurationMs,
-    this.voiceCodec,
     this.messageId,
     this.retryCount = 0,
     this.estimatedTimeoutMs,
@@ -63,10 +55,6 @@ class Message {
     int? pathLength,
     Uint8List? pathBytes,
     bool? isCli,
-    bool? isVoice,
-    String? voicePath,
-    int? voiceDurationMs,
-    String? voiceCodec,
   }) {
     return Message(
       senderKey: senderKey,
@@ -75,10 +63,6 @@ class Message {
       isOutgoing: isOutgoing,
       isCli: isCli ?? this.isCli,
       status: status ?? this.status,
-      isVoice: isVoice ?? this.isVoice,
-      voicePath: voicePath ?? this.voicePath,
-      voiceDurationMs: voiceDurationMs ?? this.voiceDurationMs,
-      voiceCodec: voiceCodec ?? this.voiceCodec,
       messageId: messageId,
       retryCount: retryCount ?? this.retryCount,
       estimatedTimeoutMs: estimatedTimeoutMs ?? this.estimatedTimeoutMs,
@@ -117,7 +101,6 @@ class Message {
       isOutgoing: false,
       isCli: false,
       status: MessageStatus.delivered,
-      isVoice: false,
       pathBytes: Uint8List(0),
     );
   }
@@ -135,7 +118,6 @@ class Message {
       isOutgoing: true,
       isCli: false,
       status: MessageStatus.pending,
-      isVoice: false,
       pathLength: pathLength,
       pathBytes: pathBytes,
     );

lib/screens/channel_chat_screen.dart

@@ -32,6 +32,8 @@ class ChannelChatScreen extends StatefulWidget {
 class _ChannelChatScreenState extends State<ChannelChatScreen> {
   final TextEditingController _textController = TextEditingController();
   final ScrollController _scrollController = ScrollController();
+  ChannelMessage? _replyingToMessage;
+  final Map<String, GlobalKey> _messageKeys = {};
 
   @override
   void initState() {
@@ -60,6 +62,41 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
     }
   }
 
+  void _setReplyingTo(ChannelMessage message) {
+    setState(() {
+      _replyingToMessage = message;
+    });
+  }
+
+  void _cancelReply() {
+    setState(() {
+      _replyingToMessage = null;
+    });
+  }
+
+  Future<void> _scrollToMessage(String messageId) async {
+    final key = _messageKeys[messageId];
+    if (key == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Original message not found'),
+          duration: Duration(seconds: 2),
+        ),
+      );
+      return;
+    }
+
+    final targetContext = key.currentContext;
+    if (targetContext == null) return;
+
+    await Scrollable.ensureVisible(
+      targetContext,
+      duration: const Duration(milliseconds: 300),
+      curve: Curves.easeInOut,
+      alignment: 0.3,
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -149,12 +186,16 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
                   return ListView.builder(
                     controller: _scrollController,
                     padding: const EdgeInsets.all(8),
-                    cacheExtent: 0,
-                    addAutomaticKeepAlives: false,
                     itemCount: messages.length,
                     itemBuilder: (context, index) {
                       final message = messages[index];
-                      return _buildMessageBubble(message);
+                      if (!_messageKeys.containsKey(message.messageId)) {
+                        _messageKeys[message.messageId] = GlobalKey();
+                      }
+                      return Container(
+                        key: _messageKeys[message.messageId]!,
+                        child: _buildMessageBubble(message),
+                      );
                     },
                   );
                 },
@@ -214,6 +255,10 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
                       ),
                       const SizedBox(height: 4),
                     ],
+                    if (message.replyToMessageId != null) ...[
+                      _buildReplyPreview(message),
+                      const SizedBox(height: 8),
+                    ],
                     if (poi != null)
                       _buildPoiMessage(context, poi, isOutgoing)
                     else if (gifId != null)
@@ -282,6 +327,79 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
     );
   }
 
+  Widget _buildReplyPreview(ChannelMessage message) {
+    final connector = context.read<MeshCoreConnector>();
+    final isOwnNode = message.replyToSenderName == connector.selfName;
+    final replyText = message.replyToText ?? '';
+
+    final gifId = _parseGifId(replyText);
+    final poi = _parsePoiMessage(replyText);
+
+    Widget contentPreview;
+    if (gifId != null) {
+      contentPreview = Row(
+        children: [
+          Icon(Icons.gif_box, size: 14, color: Colors.grey[600]),
+          const SizedBox(width: 4),
+          Text('GIF', style: TextStyle(fontSize: 12, color: Colors.grey[700])),
+        ],
+      );
+    } else if (poi != null) {
+      contentPreview = Row(
+        children: [
+          Icon(Icons.location_on_outlined, size: 14, color: Colors.grey[600]),
+          const SizedBox(width: 4),
+          Text('Location', style: TextStyle(fontSize: 12, color: Colors.grey[700])),
+        ],
+      );
+    } else {
+      contentPreview = Text(
+        replyText,
+        maxLines: 2,
+        overflow: TextOverflow.ellipsis,
+        style: TextStyle(
+          fontSize: 12,
+          color: Colors.grey[700],
+          fontStyle: FontStyle.italic,
+        ),
+      );
+    }
+
+    return GestureDetector(
+      onTap: () => _scrollToMessage(message.replyToMessageId!),
+      child: Container(
+        padding: const EdgeInsets.all(8),
+        decoration: BoxDecoration(
+          color: Colors.black.withValues(alpha: 0.05),
+          borderRadius: BorderRadius.circular(8),
+          border: Border(
+            left: BorderSide(
+              color: Theme.of(context).colorScheme.primary,
+              width: 3,
+            ),
+          ),
+        ),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'Reply to ${message.replyToSenderName}',
+              style: TextStyle(
+                fontSize: 11,
+                fontWeight: FontWeight.bold,
+                color: isOwnNode
+                    ? Theme.of(context).colorScheme.primary
+                    : Theme.of(context).colorScheme.onSurface,
+              ),
+            ),
+            const SizedBox(height: 2),
+            contentPreview,
+          ],
+        ),
+      ),
+    );
+  }
+
   String? _parseGifId(String text) {
     final trimmed = text.trim();
     final match = RegExp(r'^g:([A-Za-z0-9_-]+)$').firstMatch(trimmed);
@@ -412,22 +530,84 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
     return colors[hash.abs() % colors.length];
   }
 
-  Widget _buildMessageComposer() {
+  Widget _buildReplyBanner() {
-    final connector = context.watch<MeshCoreConnector>();
+    final message = _replyingToMessage!;
-    final maxBytes = maxChannelMessageBytes(connector.selfName);
     return Container(
-      padding: const EdgeInsets.all(8),
+      width: double.infinity,
+      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
       decoration: BoxDecoration(
-        color: Theme.of(context).colorScheme.surface,
+        color: Theme.of(context).colorScheme.secondaryContainer,
-        boxShadow: [
+        border: Border(
-          BoxShadow(
+          bottom: BorderSide(
-            color: Colors.black.withValues(alpha: 0.1),
+            color: Theme.of(context).dividerColor,
-            blurRadius: 4,
+            width: 1,
-            offset: const Offset(0, -2),
+          ),
+        ),
+      ),
+      child: Row(
+        children: [
+          Icon(
+            Icons.reply,
+            size: 18,
+            color: Theme.of(context).colorScheme.onSecondaryContainer,
+          ),
+          const SizedBox(width: 8),
+          Expanded(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  'Replying to ${message.senderName}',
+                  style: TextStyle(
+                    fontSize: 12,
+                    fontWeight: FontWeight.bold,
+                    color: Theme.of(context).colorScheme.onSecondaryContainer,
+                  ),
+                ),
+                Text(
+                  message.text,
+                  maxLines: 1,
+                  overflow: TextOverflow.ellipsis,
+                  style: TextStyle(
+                    fontSize: 11,
+                    color: Theme.of(context).colorScheme.onSecondaryContainer.withValues(alpha: 0.7),
+                  ),
+                ),
+              ],
+            ),
+          ),
+          IconButton(
+            icon: const Icon(Icons.close, size: 18),
+            onPressed: _cancelReply,
+            color: Theme.of(context).colorScheme.onSecondaryContainer,
+            padding: EdgeInsets.zero,
+            constraints: const BoxConstraints(),
           ),
         ],
       ),
-      child: Row(
+    );
+  }
+
+  Widget _buildMessageComposer() {
+    final connector = context.watch<MeshCoreConnector>();
+    final maxBytes = maxChannelMessageBytes(connector.selfName);
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        if (_replyingToMessage != null) _buildReplyBanner(),
+        Container(
+          padding: const EdgeInsets.all(8),
+          decoration: BoxDecoration(
+            color: Theme.of(context).colorScheme.surface,
+            boxShadow: [
+              BoxShadow(
+                color: Colors.black.withValues(alpha: 0.1),
+                blurRadius: 4,
+                offset: const Offset(0, -2),
+              ),
+            ],
+          ),
+          child: Row(
         children: [
           IconButton(
             icon: const Icon(Icons.gif_box),
@@ -491,7 +671,9 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
             color: Theme.of(context).colorScheme.primary,
           ),
         ],
-      ),
+          ),
+        ),
+      ],
     );
   }
 
@@ -500,16 +682,23 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
     if (text.isEmpty) return;
 
     final connector = context.read<MeshCoreConnector>();
+
+    String messageText = text;
+    if (_replyingToMessage != null) {
+      messageText = '@[${_replyingToMessage!.senderName}] $text';
+    }
+
     final maxBytes = maxChannelMessageBytes(connector.selfName);
-    if (utf8.encode(text).length > maxBytes) {
+    if (utf8.encode(messageText).length > maxBytes) {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(content: Text('Message too long (max $maxBytes bytes).')),
       );
       return;
     }
 
-    connector.sendChannelMessage(widget.channel, text);
+    connector.sendChannelMessage(widget.channel, messageText);
     _textController.clear();
+    _cancelReply();
   }
 
   String _formatTime(DateTime time) {
@@ -539,6 +728,14 @@ class _ChannelChatScreenState extends State<ChannelChatScreen> {
         child: Column(
           mainAxisSize: MainAxisSize.min,
           children: [
+            ListTile(
+              leading: const Icon(Icons.reply),
+              title: const Text('Reply'),
+              onTap: () {
+                Navigator.pop(sheetContext);
+                _setReplyingTo(message);
+              },
+            ),
             ListTile(
               leading: const Icon(Icons.copy),
               title: const Text('Copy'),

lib/screens/channels_screen.dart

@@ -7,7 +7,10 @@ import 'package:provider/provider.dart';
 
 import '../connector/meshcore_connector.dart';
 import '../models/channel.dart';
+import '../utils/dialog_utils.dart';
+import '../utils/disconnect_navigation_mixin.dart';
 import '../utils/route_transitions.dart';
+import '../widgets/empty_state.dart';
 import '../widgets/quick_switch_bar.dart';
 import '../widgets/unread_badge.dart';
 import 'channel_chat_screen.dart';
@@ -27,7 +30,8 @@ class ChannelsScreen extends StatefulWidget {
   State<ChannelsScreen> createState() => _ChannelsScreenState();
 }
 
-class _ChannelsScreenState extends State<ChannelsScreen> {
+class _ChannelsScreenState extends State<ChannelsScreen>
+    with DisconnectNavigationMixin {
   @override
   void initState() {
     super.initState();
@@ -39,6 +43,12 @@ class _ChannelsScreenState extends State<ChannelsScreen> {
   @override
   Widget build(BuildContext context) {
     final connector = context.watch<MeshCoreConnector>();
+
+    // Auto-navigate back to scanner if disconnected
+    if (!checkConnectionAndNavigate(connector)) {
+      return const SizedBox.shrink();
+    }
+
     final allowBack = !connector.isConnected;
 
     return PopScope(
@@ -77,23 +87,13 @@ class _ChannelsScreenState extends State<ChannelsScreen> {
             final channels = connector.channels;
 
             if (channels.isEmpty) {
-              return Center(
+              return EmptyState(
-                child: Column(
+                icon: Icons.tag,
-                  mainAxisAlignment: MainAxisAlignment.center,
+                title: 'No channels configured',
-                  children: [
+                action: FilledButton.icon(
-                    Icon(Icons.tag, size: 64, color: Colors.grey[400]),
+                  onPressed: () => _addPublicChannel(context, connector),
-                    const SizedBox(height: 16),
+                  icon: const Icon(Icons.public),
-                    Text(
+                  label: const Text('Add Public Channel'),
-                      'No channels configured',
-                      style: TextStyle(fontSize: 16, color: Colors.grey[600]),
-                    ),
-                    const SizedBox(height: 24),
-                    FilledButton.icon(
-                      onPressed: () => _addPublicChannel(context, connector),
-                      icon: const Icon(Icons.public),
-                      label: const Text('Add Public Channel'),
-                    ),
-                  ],
                 ),
               );
             }
@@ -190,14 +190,17 @@ class _ChannelsScreenState extends State<ChannelsScreen> {
             ),
           ],
         ),
-        onTap: () {
+        onTap: () async {
           connector.markChannelRead(channel.index);
-          Navigator.push(
+          await Future.delayed(const Duration(milliseconds: 50));
-            context,
+          if (context.mounted) {
-            MaterialPageRoute(
+            Navigator.push(
-              builder: (context) => ChannelChatScreen(channel: channel),
+              context,
-            ),
+              MaterialPageRoute(
-          );
+                builder: (context) => ChannelChatScreen(channel: channel),
+              ),
+            );
+          }
         },
         onLongPress: () => _showChannelActions(context, connector, channel),
       ),
@@ -218,17 +221,23 @@ class _ChannelsScreenState extends State<ChannelsScreen> {
             ListTile(
               leading: const Icon(Icons.edit_outlined),
               title: const Text('Edit channel'),
-              onTap: () {
+              onTap: () async {
                 Navigator.pop(context);
-                _showEditChannelDialog(context, connector, channel);
+                await Future.delayed(const Duration(milliseconds: 100));
+                if (context.mounted) {
+                  _showEditChannelDialog(context, connector, channel);
+                }
               },
             ),
             ListTile(
               leading: const Icon(Icons.delete_outline, color: Colors.red),
               title: const Text('Delete channel', style: TextStyle(color: Colors.red)),
-              onTap: () {
+              onTap: () async {
                 Navigator.pop(context);
-                _confirmDeleteChannel(context, connector, channel);
+                await Future.delayed(const Duration(milliseconds: 100));
+                if (context.mounted) {
+                  _confirmDeleteChannel(context, connector, channel);
+                }
               },
             ),
           ],
@@ -261,27 +270,7 @@ class _ChannelsScreenState extends State<ChannelsScreen> {
 
   Future<void> _disconnect(BuildContext context) async {
     final connector = context.read<MeshCoreConnector>();
-    final confirmed = await showDialog<bool>(
+    await showDisconnectDialog(context, connector);
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('Disconnect'),
-        content: const Text('Are you sure you want to disconnect from this device?'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context, false),
-            child: const Text('Cancel'),
-          ),
-          TextButton(
-            onPressed: () => Navigator.pop(context, true),
-            child: const Text('Disconnect'),
-          ),
-        ],
-      ),
-    );
-
-    if (confirmed == true) {
-      await connector.disconnect();
-    }
   }
 
   void _showAddChannelDialog(BuildContext context) {
@@ -402,9 +391,11 @@ class _ChannelsScreenState extends State<ChannelsScreen> {
 
                 Navigator.pop(context);
                 connector.setChannel(selectedIndex, name, psk);
-                ScaffoldMessenger.of(context).showSnackBar(
+                if (context.mounted) {
-                  SnackBar(content: Text('Channel "$name" added')),
+                  ScaffoldMessenger.of(context).showSnackBar(
-                );
+                    SnackBar(content: Text('Channel "$name" added')),
+                  );
+                }
               },
               child: const Text('Add'),
             ),

lib/screens/chat_screen.dart

@@ -1,13 +1,10 @@
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 import 'package:latlong2/latlong.dart';
-import 'package:record/record.dart';
 
 import '../connector/meshcore_connector.dart';
 import '../connector/meshcore_protocol.dart';
@@ -15,14 +12,12 @@ import '../helpers/utf8_length_limiter.dart';
 import '../models/channel_message.dart';
 import '../models/contact.dart';
 import '../models/message.dart';
-import '../services/voice_message_service.dart';
 import '../services/path_history_service.dart';
 import 'channel_message_path_screen.dart';
 import 'map_screen.dart';
 import '../utils/emoji_utils.dart';
 import '../widgets/gif_message.dart';
 import '../widgets/gif_picker.dart';
-import '../widgets/voice_message.dart';
 
 class ChatScreen extends StatefulWidget {
   final Contact contact;
@@ -37,16 +32,6 @@ class _ChatScreenState extends State<ChatScreen> {
   final _textController = TextEditingController();
   final _scrollController = ScrollController();
   bool _forceFlood = false;
-  final AudioRecorder _voiceRecorder = AudioRecorder();
-  StreamSubscription<Uint8List>? _voiceStreamSubscription;
-  BytesBuilder _voiceBuffer = BytesBuilder(copy: false);
-  Timer? _voiceRecordTimer;
-  bool _isRecordingVoice = false;
-  Message? _pendingVoiceMessage;
-  Uint8List? _pendingVoiceCodec2Bytes;
-  int? _pendingVoiceTimestampSeconds;
-  int? _pendingVoiceDurationMs;
-  String? _pendingVoicePath;
 
   @override
   void initState() {
@@ -62,11 +47,6 @@ class _ChatScreenState extends State<ChatScreen> {
     context.read<MeshCoreConnector>().setActiveContact(null);
     _textController.dispose();
     _scrollController.dispose();
-    _voiceRecordTimer?.cancel();
-    _voiceStreamSubscription?.cancel();
-    unawaited(_voiceRecorder.stop());
-    _voiceRecorder.dispose();
-    unawaited(_clearPendingVoicePreview(deleteFile: true, notify: false));
     super.dispose();
   }
 
@@ -204,8 +184,6 @@ class _ChatScreenState extends State<ChatScreen> {
     return ListView.builder(
       controller: _scrollController,
       padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 16),
-      cacheExtent: 0,
-      addAutomaticKeepAlives: false,
       itemCount: messages.length,
       itemBuilder: (context, index) {
         final message = messages[index];
@@ -221,9 +199,6 @@ class _ChatScreenState extends State<ChatScreen> {
 
   Widget _buildInputBar(MeshCoreConnector connector) {
     final maxBytes = maxContactMessageBytes();
-    final isVoiceBusy = connector.isVoiceSending;
-    final voiceSupported = Platform.isAndroid || Platform.isIOS;
-    final hasPendingVoice = _pendingVoiceMessage != null;
     final colorScheme = Theme.of(context).colorScheme;
     return Container(
       padding: const EdgeInsets.all(8),
@@ -236,93 +211,59 @@ class _ChatScreenState extends State<ChatScreen> {
       child: SafeArea(
         child: Row(
           children: [
-            if (voiceSupported)
-              IconButton(
-                icon: Icon(_isRecordingVoice ? Icons.stop_circle : Icons.mic),
-                onPressed: (isVoiceBusy || hasPendingVoice) ? null : () => _toggleVoiceRecording(connector),
-                tooltip: _isRecordingVoice ? 'Stop recording' : 'Record voice',
-              ),
             IconButton(
               icon: const Icon(Icons.gif_box),
-              onPressed: (_isRecordingVoice || isVoiceBusy || hasPendingVoice)
+              onPressed: () => _showGifPicker(context),
-                  ? null
-                  : () => _showGifPicker(context),
               tooltip: 'Send GIF',
             ),
             Expanded(
-              child: hasPendingVoice
+              child: ValueListenableBuilder<TextEditingValue>(
-                  ? _buildVoicePreview(colorScheme)
+                valueListenable: _textController,
-                  : ValueListenableBuilder<TextEditingValue>(
+                builder: (context, value, child) {
-                      valueListenable: _textController,
+                  final gifId = _parseGifId(value.text);
-                      builder: (context, value, child) {
+                  if (gifId != null) {
-                        final gifId = _parseGifId(value.text);
+                    return Row(
-                        if (gifId != null) {
+                      children: [
-                          return Row(
+                        Expanded(
-                            children: [
+                          child: GifMessage(
-                              Expanded(
+                            url: 'https://media.giphy.com/media/$gifId/giphy.gif',
-                                child: GifMessage(
+                            backgroundColor: colorScheme.surfaceContainerHighest,
-                                  url: 'https://media.giphy.com/media/$gifId/giphy.gif',
+                            fallbackTextColor:
-                                  backgroundColor: colorScheme.surfaceContainerHighest,
+                                colorScheme.onSurface.withValues(alpha: 0.6),
-                                  fallbackTextColor:
+                            width: 160,
-                                      colorScheme.onSurface.withValues(alpha: 0.6),
+                            height: 110,
-                                  width: 160,
-                                  height: 110,
-                                ),
-                              ),
-                              const SizedBox(width: 8),
-                              IconButton(
-                                icon: const Icon(Icons.close),
-                                onPressed: () => _textController.clear(),
-                              ),
-                            ],
-                          );
-                        }
-
-                        return TextField(
-                          controller: _textController,
-                          enabled: !_isRecordingVoice && !isVoiceBusy,
-                          inputFormatters: [
-                            Utf8LengthLimitingTextInputFormatter(maxBytes),
-                          ],
-                          decoration: const InputDecoration(
-                            hintText: 'Type a message...',
-                            border: OutlineInputBorder(),
-                            contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 12),
                           ),
-                          textInputAction: TextInputAction.send,
+                        ),
-                          onSubmitted: (_isRecordingVoice || isVoiceBusy)
+                        const SizedBox(width: 8),
-                              ? null
+                        IconButton(
-                              : (_) => _sendMessage(connector),
+                          icon: const Icon(Icons.close),
-                        );
+                          onPressed: () => _textController.clear(),
-                      },
+                        ),
+                      ],
+                    );
+                  }
+
+                  return TextField(
+                    controller: _textController,
+                    inputFormatters: [
+                      Utf8LengthLimitingTextInputFormatter(maxBytes),
+                    ],
+                    decoration: const InputDecoration(
+                      hintText: 'Type a message...',
+                      border: OutlineInputBorder(),
+                      contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 12),
                     ),
+                    textInputAction: TextInputAction.send,
+                    onSubmitted: (_) => _sendMessage(connector),
+                  );
+                },
+              ),
             ),
             const SizedBox(width: 8),
-            if (isVoiceBusy)
+            IconButton.filled(
-              IconButton.filled(
+              icon: const Icon(Icons.send),
-                icon: const Icon(Icons.stop_circle),
+              onPressed: () => _sendMessage(connector),
-                onPressed: () => _cancelVoiceSend(connector),
+            ),
-                tooltip: 'Cancel voice send',
-              )
-            else if (hasPendingVoice) ...[
-              IconButton(
-                icon: const Icon(Icons.close),
-                onPressed: () => _clearPendingVoicePreview(deleteFile: true),
-                tooltip: 'Discard voice message',
-              ),
-              IconButton.filled(
-                icon: const Icon(Icons.send),
-                onPressed: () => _sendPendingVoice(connector),
-                tooltip: 'Send voice message',
-              ),
-            ]
-            else
-              IconButton.filled(
-                icon: const Icon(Icons.send),
-                onPressed: (_isRecordingVoice || isVoiceBusy)
-                    ? null
-                    : () => _sendMessage(connector),
-              ),
           ],
         ),
       ),
@@ -377,208 +318,6 @@ class _ChatScreenState extends State<ChatScreen> {
     });
   }
 
-  void _cancelVoiceSend(MeshCoreConnector connector) {
-    connector.cancelVoiceSend();
-    if (!mounted) return;
-    ScaffoldMessenger.of(context).showSnackBar(
-      const SnackBar(content: Text('Voice send canceled')),
-    );
-  }
-
-  Future<void> _toggleVoiceRecording(MeshCoreConnector connector) async {
-    if (_isRecordingVoice) {
-      await _stopVoiceRecording(connector);
-    } else {
-      await _startVoiceRecording();
-    }
-  }
-
-  Future<void> _startVoiceRecording() async {
-    if (_isRecordingVoice) return;
-    final hasPermission = await _voiceRecorder.hasPermission();
-    if (!hasPermission) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Microphone permission denied')),
-      );
-      return;
-    }
-
-    _voiceBuffer = BytesBuilder(copy: false);
-    try {
-      final stream = await _voiceRecorder.startStream(
-        const RecordConfig(
-          encoder: AudioEncoder.pcm16bits,
-          sampleRate: VoiceMessageService.sampleRate,
-          numChannels: VoiceMessageService.channels,
-        ),
-      );
-      _voiceStreamSubscription = stream.listen((data) {
-        _voiceBuffer.add(data);
-      });
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('Failed to start recording: $e')),
-      );
-      return;
-    }
-    _voiceRecordTimer?.cancel();
-    _voiceRecordTimer = Timer(
-      const Duration(seconds: VoiceMessageService.maxRecordSeconds),
-      () => _stopVoiceRecording(context.read<MeshCoreConnector>()),
-    );
-    setState(() {
-      _isRecordingVoice = true;
-    });
-  }
-
-  Future<void> _stopVoiceRecording(MeshCoreConnector connector) async {
-    if (!_isRecordingVoice) return;
-    _voiceRecordTimer?.cancel();
-    await _voiceRecorder.stop();
-    await _voiceStreamSubscription?.cancel();
-    _voiceStreamSubscription = null;
-    final pcmBytes = _voiceBuffer.takeBytes();
-    setState(() {
-      _isRecordingVoice = false;
-    });
-    if (pcmBytes.isEmpty) return;
-    await _prepareVoicePreview(connector, pcmBytes);
-  }
-
-  Future<void> _prepareVoicePreview(MeshCoreConnector connector, Uint8List pcmBytes) async {
-    final voiceService = VoiceMessageService.instance;
-    try {
-      final codec2Bytes = voiceService.encodePcmToCodec2(pcmBytes);
-      if (codec2Bytes.isEmpty) return;
-      final timestampSeconds = connector.reserveVoiceTimestampSeconds();
-      final durationMs = voiceService.durationMsForCodec2Bytes(codec2Bytes);
-      final decodedPcm = voiceService.decodeCodec2ToPcm(codec2Bytes);
-      final fileName = voiceService.buildVoiceFileName(
-        senderKeyHex: widget.contact.publicKeyHex,
-        timestampSeconds: timestampSeconds,
-        outgoing: true,
-      );
-      final voicePath = await voiceService.writeWavFile(
-        pcmBytes: decodedPcm,
-        fileName: fileName,
-      );
-
-      final previewMessage = Message(
-        senderKey: widget.contact.publicKey,
-        text: 'Voice message',
-        timestamp: DateTime.fromMillisecondsSinceEpoch(timestampSeconds * 1000),
-        isOutgoing: true,
-        isCli: false,
-        status: MessageStatus.pending,
-        isVoice: true,
-        voicePath: voicePath,
-        voiceDurationMs: durationMs,
-        voiceCodec: VoiceMessageService.codecName,
-      );
-
-      if (!mounted) return;
-      setState(() {
-        _pendingVoiceMessage = previewMessage;
-        _pendingVoiceCodec2Bytes = codec2Bytes;
-        _pendingVoiceTimestampSeconds = timestampSeconds;
-        _pendingVoiceDurationMs = durationMs;
-        _pendingVoicePath = voicePath;
-      });
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('Voice message failed: $e')),
-      );
-    }
-  }
-
-  Widget _buildVoicePreview(ColorScheme colorScheme) {
-    final message = _pendingVoiceMessage;
-    if (message == null) {
-      return const SizedBox.shrink();
-    }
-
-    return Container(
-      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
-      decoration: BoxDecoration(
-        color: colorScheme.surfaceContainerHighest,
-        borderRadius: BorderRadius.circular(12),
-      ),
-      child: VoiceMessageBubble(
-        message: message,
-        backgroundColor: colorScheme.surfaceContainerHighest,
-        textColor: colorScheme.onSurface,
-        metaColor: colorScheme.onSurface.withValues(alpha: 0.7),
-        isOutgoing: true,
-      ),
-    );
-  }
-
-  Future<void> _sendPendingVoice(MeshCoreConnector connector) async {
-    final codec2Bytes = _pendingVoiceCodec2Bytes;
-    final voicePath = _pendingVoicePath;
-    final durationMs = _pendingVoiceDurationMs;
-    final timestampSeconds = _pendingVoiceTimestampSeconds;
-
-    if (codec2Bytes == null ||
-        codec2Bytes.isEmpty ||
-        voicePath == null ||
-        voicePath.isEmpty ||
-        durationMs == null ||
-        timestampSeconds == null) {
-      return;
-    }
-    if (!connector.isConnected) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Not connected to a MeshCore device')),
-      );
-      return;
-    }
-    if (connector.isVoiceSending) {
-      return;
-    }
-
-    await connector.sendVoiceMessage(
-      contact: widget.contact,
-      codec2Bytes: codec2Bytes,
-      voicePath: voicePath,
-      durationMs: durationMs,
-      timestampSeconds: timestampSeconds,
-    );
-    unawaited(_clearPendingVoicePreview(deleteFile: false));
-  }
-
-  Future<void> _clearPendingVoicePreview({required bool deleteFile, bool notify = true}) async {
-    final path = _pendingVoicePath;
-    if (notify && mounted) {
-      setState(() {
-        _pendingVoiceMessage = null;
-        _pendingVoiceCodec2Bytes = null;
-        _pendingVoiceTimestampSeconds = null;
-        _pendingVoiceDurationMs = null;
-        _pendingVoicePath = null;
-      });
-    } else {
-      _pendingVoiceMessage = null;
-      _pendingVoiceCodec2Bytes = null;
-      _pendingVoiceTimestampSeconds = null;
-      _pendingVoiceDurationMs = null;
-      _pendingVoicePath = null;
-    }
-    if (deleteFile && path != null && path.isNotEmpty) {
-      try {
-        final file = File(path);
-        if (await file.exists()) {
-          await file.delete();
-        }
-      } catch (_) {
-        return;
-      }
-    }
-  }
 
   void _showPathHistory(BuildContext context) {
     final connector = Provider.of<MeshCoreConnector>(context, listen: false);
@@ -1279,15 +1018,14 @@ class _ChatScreenState extends State<ChatScreen> {
         child: Column(
           mainAxisSize: MainAxisSize.min,
           children: [
-            if (!message.isVoice)
+            ListTile(
-              ListTile(
+              leading: const Icon(Icons.copy),
-                leading: const Icon(Icons.copy),
+              title: const Text('Copy'),
-                title: const Text('Copy'),
+              onTap: () {
-                onTap: () {
+                Navigator.pop(sheetContext);
-                  Navigator.pop(sheetContext);
+                _copyMessageText(message.text);
-                  _copyMessageText(message.text);
+              },
-                },
+            ),
-              ),
             ListTile(
               leading: const Icon(Icons.delete_outline),
               title: const Text('Delete'),
@@ -1297,8 +1035,7 @@ class _ChatScreenState extends State<ChatScreen> {
               },
             ),
             if (message.isOutgoing &&
-                message.status == MessageStatus.failed &&
+                message.status == MessageStatus.failed)
-                !message.isVoice)
               ListTile(
                 leading: const Icon(Icons.refresh),
                 title: const Text('Retry'),
@@ -1412,15 +1149,7 @@ class _MessageBubble extends StatelessWidget {
                       ),
                       const SizedBox(height: 4),
                     ],
-                    if (message.isVoice)
+                    if (poi != null)
-                      VoiceMessageBubble(
-                        message: message,
-                        backgroundColor: bubbleColor,
-                        textColor: textColor,
-                        metaColor: metaColor,
-                        isOutgoing: isOutgoing,
-                      )
-                    else if (poi != null)
                       _buildPoiMessage(context, poi, textColor, metaColor)
                     else if (gifId != null)
                       GifMessage(

lib/screens/contacts_screen.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -7,8 +9,11 @@ import '../models/contact.dart';
 import '../models/contact_group.dart';
 import '../storage/contact_group_store.dart';
 import '../utils/contact_search.dart';
+import '../utils/dialog_utils.dart';
+import '../utils/disconnect_navigation_mixin.dart';
 import '../utils/emoji_utils.dart';
 import '../utils/route_transitions.dart';
+import '../widgets/empty_state.dart';
 import '../widgets/quick_switch_bar.dart';
 import '../widgets/repeater_login_dialog.dart';
 import '../widgets/unread_badge.dart';
@@ -46,7 +51,8 @@ class ContactsScreen extends StatefulWidget {
   State<ContactsScreen> createState() => _ContactsScreenState();
 }
 
-class _ContactsScreenState extends State<ContactsScreen> {
+class _ContactsScreenState extends State<ContactsScreen>
+    with DisconnectNavigationMixin {
   final TextEditingController _searchController = TextEditingController();
   String _searchQuery = '';
   ContactSortOption _sortOption = ContactSortOption.lastSeen;
@@ -54,6 +60,7 @@ class _ContactsScreenState extends State<ContactsScreen> {
   bool _showUnreadOnly = false;
   final ContactGroupStore _groupStore = ContactGroupStore();
   List<ContactGroup> _groups = [];
+  Timer? _searchDebounce;
 
   @override
   void initState() {
@@ -63,6 +70,7 @@ class _ContactsScreenState extends State<ContactsScreen> {
 
   @override
   void dispose() {
+    _searchDebounce?.cancel();
     _searchController.dispose();
     super.dispose();
   }
@@ -82,16 +90,13 @@ class _ContactsScreenState extends State<ContactsScreen> {
   @override
   Widget build(BuildContext context) {
     final connector = context.watch<MeshCoreConnector>();
-    final allowBack = !connector.isConnected;
 
-    if (!connector.isConnected) {
+    // Auto-navigate back to scanner if disconnected
-      WidgetsBinding.instance.addPostFrameCallback((_) {
+    if (!checkConnectionAndNavigate(connector)) {
-        if (context.mounted) {
+      return const SizedBox.shrink();
-          Navigator.popUntil(context, (route) => route.isFirst);
-        }
-      });
     }
 
+    final allowBack = !connector.isConnected;
     final theme = Theme.of(context);
 
     return PopScope(
@@ -245,27 +250,7 @@ class _ContactsScreenState extends State<ContactsScreen> {
     BuildContext context,
     MeshCoreConnector connector,
   ) async {
-    final confirmed = await showDialog<bool>(
+    await showDisconnectDialog(context, connector);
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('Disconnect'),
-        content: const Text('Are you sure you want to disconnect from this device?'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context, false),
-            child: const Text('Cancel'),
-          ),
-          TextButton(
-            onPressed: () => Navigator.pop(context, true),
-            child: const Text('Disconnect'),
-          ),
-        ],
-      ),
-    );
-
-    if (confirmed == true) {
-      await connector.disconnect();
-    }
   }
 
   Widget _buildContactsBody(BuildContext context, MeshCoreConnector connector) {
@@ -276,23 +261,10 @@ class _ContactsScreenState extends State<ContactsScreen> {
     }
 
     if (contacts.isEmpty && _groups.isEmpty) {
-      return Center(
+      return const EmptyState(
-        child: Column(
+        icon: Icons.people_outline,
-          mainAxisAlignment: MainAxisAlignment.center,
+        title: 'No contacts yet',
-          children: [
+        subtitle: 'Contacts will appear when devices advertise',
-            Icon(Icons.people_outline, size: 64, color: Colors.grey[400]),
-            const SizedBox(height: 16),
-            Text(
-              'No contacts yet',
-              style: TextStyle(fontSize: 16, color: Colors.grey[600]),
-            ),
-            const SizedBox(height: 8),
-            Text(
-              'Contacts will appear when devices advertise',
-              style: TextStyle(fontSize: 14, color: Colors.grey[500]),
-            ),
-          ],
-        ),
       );
     }
 
@@ -326,8 +298,12 @@ class _ContactsScreenState extends State<ContactsScreen> {
               contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
             ),
             onChanged: (value) {
-              setState(() {
+              _searchDebounce?.cancel();
-                _searchQuery = value.toLowerCase();
+              _searchDebounce = Timer(const Duration(milliseconds: 300), () {
+                if (!mounted) return;
+                setState(() {
+                  _searchQuery = value.toLowerCase();
+                });
               });
             },
           ),

lib/screens/device_screen.dart

@@ -2,6 +2,8 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import '../connector/meshcore_connector.dart';
+import '../utils/dialog_utils.dart';
+import '../utils/disconnect_navigation_mixin.dart';
 import '../utils/route_transitions.dart';
 import '../widgets/quick_switch_bar.dart';
 import 'channels_screen.dart';
@@ -17,7 +19,8 @@ class DeviceScreen extends StatefulWidget {
   State<DeviceScreen> createState() => _DeviceScreenState();
 }
 
-class _DeviceScreenState extends State<DeviceScreen> {
+class _DeviceScreenState extends State<DeviceScreen>
+    with DisconnectNavigationMixin {
   bool _showBatteryVoltage = false;
   int _quickIndex = 0;
 
@@ -25,13 +28,9 @@ class _DeviceScreenState extends State<DeviceScreen> {
   Widget build(BuildContext context) {
     return Consumer<MeshCoreConnector>(
       builder: (context, connector, child) {
-        // If disconnected, pop back to scanner
+        // Auto-navigate back to scanner if disconnected
-        if (!connector.isConnected) {
+        if (!checkConnectionAndNavigate(connector)) {
-          WidgetsBinding.instance.addPostFrameCallback((_) {
+          return const SizedBox.shrink();
-            if (context.mounted) {
-              Navigator.popUntil(context, (route) => route.isFirst);
-            }
-          });
         }
 
         final theme = Theme.of(context);
@@ -286,26 +285,6 @@ class _DeviceScreenState extends State<DeviceScreen> {
     BuildContext context,
     MeshCoreConnector connector,
   ) async {
-    final confirmed = await showDialog<bool>(
+    await showDisconnectDialog(context, connector);
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('Disconnect'),
-        content: const Text('Are you sure you want to disconnect from this device?'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context, false),
-            child: const Text('Cancel'),
-          ),
-          TextButton(
-            onPressed: () => Navigator.pop(context, true),
-            child: const Text('Disconnect'),
-          ),
-        ],
-      ),
-    );
-
-    if (confirmed == true) {
-      await connector.disconnect();
-    }
   }
 }

lib/services/app_settings_service.dart

@@ -1,7 +1,7 @@
 import 'dart:convert';
 import 'package:flutter/foundation.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 import '../models/app_settings.dart';
+import '../storage/prefs_manager.dart';
 
 class AppSettingsService extends ChangeNotifier {
   static const String _settingsKey = 'app_settings';
@@ -17,7 +17,7 @@ class AppSettingsService extends ChangeNotifier {
   }
 
   Future<void> loadSettings() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = prefs.getString(_settingsKey);
 
     if (jsonStr != null) {
@@ -36,7 +36,7 @@ class AppSettingsService extends ChangeNotifier {
     _settings = newSettings;
     notifyListeners();
 
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = jsonEncode(_settings.toJson());
     await prefs.setString(_settingsKey, jsonStr);
   }

lib/services/map_marker_service.dart

@@ -1,16 +1,16 @@
-import 'package:shared_preferences/shared_preferences.dart';
+import '../storage/prefs_manager.dart';
 
 class MapMarkerService {
   static const String _removedKey = 'map_removed_marker_ids';
 
   Future<Set<String>> loadRemovedIds() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final items = prefs.getStringList(_removedKey) ?? const [];
     return items.toSet();
   }
 
   Future<void> saveRemovedIds(Set<String> ids) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     await prefs.setStringList(_removedKey, ids.toList());
   }
 }

lib/services/path_history_service.dart

@@ -10,6 +10,10 @@ class PathHistoryService extends ChangeNotifier {
   final Map<String, int> _autoRotationIndex = {};
   final Map<String, _FloodStats> _floodStats = {};
 
+  // LRU cache eviction tracking
+  static const int _maxCachedContacts = 50;
+  final List<String> _cacheAccessOrder = [];
+
   static const int _maxHistoryEntries = 100;
   static const int _autoRotationTopCount = 3;
 
@@ -91,6 +95,8 @@ class PathHistoryService extends ChangeNotifier {
       return const PathSelection(pathBytes: [], hopCount: -1, useFlood: true);
     }
 
+    _trackAccess(contactPubKeyHex);
+
     final selections = ranked
         .map((path) => PathSelection(
               pathBytes: path.pathBytes,
@@ -208,6 +214,8 @@ class PathHistoryService extends ChangeNotifier {
     );
 
     _cache[contactPubKeyHex] = updatedHistory;
+    _trackAccess(contactPubKeyHex);
+    _evictIfNeeded();
     _storage.savePathHistory(contactPubKeyHex, updatedHistory);
 
     notifyListeners();
@@ -216,12 +224,15 @@ class PathHistoryService extends ChangeNotifier {
   List<PathRecord> getRecentPaths(String contactPubKeyHex) {
     final history = _cache[contactPubKeyHex];
     if (history != null) {
+      _trackAccess(contactPubKeyHex);
       return history.recentPaths;
     }
 
     _loadHistoryFromStorage(contactPubKeyHex).then((loaded) {
       if (loaded != null) {
         _cache[contactPubKeyHex] = loaded;
+        _trackAccess(contactPubKeyHex);
+        _evictIfNeeded();
         notifyListeners();
       }
     });
@@ -236,16 +247,23 @@ class PathHistoryService extends ChangeNotifier {
 
   PathRecord? getFastestPath(String contactPubKeyHex) {
     final history = _cache[contactPubKeyHex];
+    if (history != null) {
+      _trackAccess(contactPubKeyHex);
+    }
     return history?.fastest;
   }
 
   PathRecord? getMostRecentPath(String contactPubKeyHex) {
     final history = _cache[contactPubKeyHex];
+    if (history != null) {
+      _trackAccess(contactPubKeyHex);
+    }
     return history?.mostRecent;
   }
 
   Future<void> clearPathHistory(String contactPubKeyHex) async {
     _cache.remove(contactPubKeyHex);
+    _cacheAccessOrder.remove(contactPubKeyHex);
     _autoRotationIndex.remove(contactPubKeyHex);
     _floodStats.remove(contactPubKeyHex);
     await _storage.clearPathHistory(contactPubKeyHex);
@@ -314,6 +332,20 @@ class PathHistoryService extends ChangeNotifier {
     final stats = _floodStats.putIfAbsent(contactPubKeyHex, () => _FloodStats());
     stats.lastUsed = DateTime.now();
   }
+
+  void _trackAccess(String contactPubKeyHex) {
+    _cacheAccessOrder.remove(contactPubKeyHex);
+    _cacheAccessOrder.add(contactPubKeyHex);
+  }
+
+  void _evictIfNeeded() {
+    while (_cache.length > _maxCachedContacts && _cacheAccessOrder.isNotEmpty) {
+      final oldest = _cacheAccessOrder.removeAt(0);
+      _cache.remove(oldest);
+      _autoRotationIndex.remove(oldest);
+      _floodStats.remove(oldest);
+    }
+  }
 }
 
 class _FloodStats {

lib/services/storage_service.dart

@@ -1,6 +1,6 @@
 import 'dart:convert';
-import 'package:shared_preferences/shared_preferences.dart';
 import '../models/path_history.dart';
+import '../storage/prefs_manager.dart';
 
 class StorageService {
   static const String _pathHistoryPrefix = 'path_history_';
@@ -9,14 +9,14 @@ class StorageService {
 
   Future<void> savePathHistory(
       String contactPubKeyHex, ContactPathHistory history) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_pathHistoryPrefix$contactPubKeyHex';
     final jsonStr = jsonEncode(history.toJson());
     await prefs.setString(key, jsonStr);
   }
 
   Future<ContactPathHistory?> loadPathHistory(String contactPubKeyHex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_pathHistoryPrefix$contactPubKeyHex';
     final jsonStr = prefs.getString(key);
 
@@ -31,13 +31,13 @@ class StorageService {
   }
 
   Future<void> clearPathHistory(String contactPubKeyHex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_pathHistoryPrefix$contactPubKeyHex';
     await prefs.remove(key);
   }
 
   Future<void> clearAllPathHistories() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final keys = prefs.getKeys();
     final pathHistoryKeys =
         keys.where((key) => key.startsWith(_pathHistoryPrefix));
@@ -48,7 +48,7 @@ class StorageService {
   }
 
   Future<Map<String, String>> loadPendingMessages() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = prefs.getString(_pendingMessagesKey);
 
     if (jsonStr == null) return {};
@@ -62,20 +62,20 @@ class StorageService {
   }
 
   Future<void> savePendingMessages(Map<String, String> pending) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = jsonEncode(pending);
     await prefs.setString(_pendingMessagesKey, jsonStr);
   }
 
   Future<void> clearPendingMessages() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     await prefs.remove(_pendingMessagesKey);
   }
 
   /// Save a repeater password by public key hex
   Future<void> saveRepeaterPassword(
       String repeaterPubKeyHex, String password) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final passwords = await loadRepeaterPasswords();
     passwords[repeaterPubKeyHex] = password;
     final jsonStr = jsonEncode(passwords);
@@ -84,7 +84,7 @@ class StorageService {
 
   /// Load all saved repeater passwords (map of pubKeyHex -> password)
   Future<Map<String, String>> loadRepeaterPasswords() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = prefs.getString(_repeaterPasswordsKey);
 
     if (jsonStr == null) return {};
@@ -105,7 +105,7 @@ class StorageService {
 
   /// Remove a saved repeater password
   Future<void> removeRepeaterPassword(String repeaterPubKeyHex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final passwords = await loadRepeaterPasswords();
     passwords.remove(repeaterPubKeyHex);
     final jsonStr = jsonEncode(passwords);
@@ -114,7 +114,7 @@ class StorageService {
 
   /// Clear all saved repeater passwords
   Future<void> clearAllRepeaterPasswords() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     await prefs.remove(_repeaterPasswordsKey);
   }
 }

lib/services/voice_message_service.dart

@@ -1,220 +0,0 @@
-import 'dart:convert';
-import 'dart:io';
-import 'dart:typed_data';
-
-import 'package:path/path.dart' as path;
-import 'package:path_provider/path_provider.dart';
-
-import 'codec2_ffi.dart';
-
-class VoiceMessageService {
-  static const int sampleRate = 8000;
-  static const int channels = 1;
-  static const int bitsPerSample = 16;
-  static const int maxRecordSeconds = 5;
-  static const int chunkRawBytes = 90;
-  static const String codecName = 'codec2_1300';
-  static const String chunkPrefix = 'V1|';
-
-  static final VoiceMessageService instance = VoiceMessageService._();
-
-  VoiceMessageService._();
-
-  Future<Directory> ensureVoiceDir() async {
-    final docs = await getApplicationDocumentsDirectory();
-    final dir = Directory(path.join(docs.path, 'voice'));
-    if (!await dir.exists()) {
-      await dir.create(recursive: true);
-    }
-    return dir;
-  }
-
-  String buildVoiceFileName({
-    required String senderKeyHex,
-    required int timestampSeconds,
-    bool outgoing = false,
-  }) {
-    final suffix = outgoing ? 'out' : 'in';
-    return 'voice_${senderKeyHex}_${timestampSeconds}_$suffix.wav';
-  }
-
-  List<String> buildVoiceChunks(Uint8List codec2Bytes) {
-    if (codec2Bytes.isEmpty) return [];
-    final chunks = <Uint8List>[];
-    for (var offset = 0; offset < codec2Bytes.length; offset += chunkRawBytes) {
-      final end = (offset + chunkRawBytes).clamp(0, codec2Bytes.length).toInt();
-      chunks.add(Uint8List.fromList(codec2Bytes.sublist(offset, end)));
-    }
-    final count = chunks.length;
-    return List<String>.generate(count, (index) {
-      final encoded = _base64UrlEncodeNoPad(chunks[index]);
-      return '$chunkPrefix$index/$count|$encoded';
-    });
-  }
-
-  VoiceChunk? tryParseChunk(String text) {
-    final trimmed = text.trim();
-    if (!trimmed.startsWith(chunkPrefix)) return null;
-    final match = RegExp(r'^V1\|(\d+)/(\d+)\|([A-Za-z0-9_-]+)$').firstMatch(trimmed);
-    if (match == null) return null;
-    final idx = int.tryParse(match.group(1) ?? '');
-    final count = int.tryParse(match.group(2) ?? '');
-    final payload = match.group(3);
-    if (idx == null || count == null || payload == null) return null;
-    if (idx < 0 || count <= 0 || idx >= count) return null;
-    try {
-      final bytes = _base64UrlDecode(payload);
-      return VoiceChunk(index: idx, count: count, bytes: bytes);
-    } catch (_) {
-      return null;
-    }
-  }
-
-  Uint8List encodePcmToCodec2(Uint8List pcmBytes) {
-    final session = Codec2Ffi.instance.createSession();
-    try {
-      final samplesPerFrame = session.samplesPerFrameValue;
-      final pcmSamples = _toInt16(pcmBytes);
-      final frameCount = (pcmSamples.length + samplesPerFrame - 1) ~/ samplesPerFrame;
-      final builder = BytesBuilder(copy: false);
-
-      for (var frameIndex = 0; frameIndex < frameCount; frameIndex++) {
-        final start = frameIndex * samplesPerFrame;
-        final end = (start + samplesPerFrame).clamp(0, pcmSamples.length).toInt();
-        final frame = Int16List(samplesPerFrame);
-        final copyLen = end - start;
-        if (copyLen > 0) {
-          frame.setRange(0, copyLen, pcmSamples.sublist(start, end));
-        }
-        final encoded = session.encodePcmFrame(frame);
-        builder.add(encoded);
-      }
-
-      return builder.takeBytes();
-    } finally {
-      session.dispose();
-    }
-  }
-
-  Uint8List decodeCodec2ToPcm(Uint8List codec2Bytes) {
-    final session = Codec2Ffi.instance.createSession();
-    try {
-      final bytesPerFrame = session.bytesPerFrameValue;
-      if (bytesPerFrame <= 0) return Uint8List(0);
-      final frameCount = codec2Bytes.length ~/ bytesPerFrame;
-      final builder = BytesBuilder(copy: false);
-
-      for (var frameIndex = 0; frameIndex < frameCount; frameIndex++) {
-        final start = frameIndex * bytesPerFrame;
-        final frameBytes = codec2Bytes.sublist(start, start + bytesPerFrame);
-        final decoded = session.decodeCodecFrame(frameBytes);
-        builder.add(Uint8List.view(
-          decoded.buffer,
-          decoded.offsetInBytes,
-          decoded.lengthInBytes,
-        ));
-      }
-
-      return builder.takeBytes();
-    } finally {
-      session.dispose();
-    }
-  }
-
-  int durationMsForCodec2Bytes(Uint8List codec2Bytes) {
-    final session = Codec2Ffi.instance.createSession();
-    try {
-      final bytesPerFrame = session.bytesPerFrameValue;
-      final samplesPerFrame = session.samplesPerFrameValue;
-      if (bytesPerFrame <= 0 || samplesPerFrame <= 0) return 0;
-      final frameCount = codec2Bytes.length ~/ bytesPerFrame;
-      final frameDurationMs = (samplesPerFrame * 1000 / sampleRate).round();
-      return frameCount * frameDurationMs;
-    } finally {
-      session.dispose();
-    }
-  }
-
-  Future<String> writeWavFile({
-    required Uint8List pcmBytes,
-    required String fileName,
-  }) async {
-    final dir = await ensureVoiceDir();
-    final filePath = path.join(dir.path, fileName);
-    final wavHeader = _buildWavHeader(
-      pcmDataSize: pcmBytes.length,
-      sampleRate: sampleRate,
-      channels: channels,
-      bitsPerSample: bitsPerSample,
-    );
-    final file = File(filePath);
-    final builder = BytesBuilder(copy: false);
-    builder.add(wavHeader);
-    builder.add(pcmBytes);
-    await file.writeAsBytes(builder.takeBytes(), flush: true);
-    return filePath;
-  }
-
-  Uint8List _buildWavHeader({
-    required int pcmDataSize,
-    required int sampleRate,
-    required int channels,
-    required int bitsPerSample,
-  }) {
-    final byteRate = sampleRate * channels * (bitsPerSample ~/ 8);
-    final blockAlign = channels * (bitsPerSample ~/ 8);
-    final buffer = BytesBuilder(copy: false);
-    buffer.add(ascii.encode('RIFF'));
-    buffer.add(_le32(36 + pcmDataSize));
-    buffer.add(ascii.encode('WAVE'));
-    buffer.add(ascii.encode('fmt '));
-    buffer.add(_le32(16));
-    buffer.add(_le16(1));
-    buffer.add(_le16(channels));
-    buffer.add(_le32(sampleRate));
-    buffer.add(_le32(byteRate));
-    buffer.add(_le16(blockAlign));
-    buffer.add(_le16(bitsPerSample));
-    buffer.add(ascii.encode('data'));
-    buffer.add(_le32(pcmDataSize));
-    return buffer.takeBytes();
-  }
-
-  Uint8List _le16(int value) {
-    final data = ByteData(2)..setUint16(0, value, Endian.little);
-    return data.buffer.asUint8List();
-  }
-
-  Uint8List _le32(int value) {
-    final data = ByteData(4)..setUint32(0, value, Endian.little);
-    return data.buffer.asUint8List();
-  }
-
-  Int16List _toInt16(Uint8List bytes) {
-    final evenLength = bytes.lengthInBytes - (bytes.lengthInBytes % 2);
-    if (evenLength <= 0) return Int16List(0);
-    return Int16List.view(bytes.buffer, bytes.offsetInBytes, evenLength ~/ 2);
-  }
-
-  String _base64UrlEncodeNoPad(Uint8List bytes) {
-    return base64Url.encode(bytes).replaceAll('=', '');
-  }
-
-  Uint8List _base64UrlDecode(String encoded) {
-    final paddedLength = (encoded.length + 3) ~/ 4 * 4;
-    final padded = encoded.padRight(paddedLength, '=');
-    return base64Url.decode(padded);
-  }
-}
-
-class VoiceChunk {
-  final int index;
-  final int count;
-  final Uint8List bytes;
-
-  VoiceChunk({
-    required this.index,
-    required this.count,
-    required this.bytes,
-  });
-}

lib/storage/channel_message_store.dart

@@ -1,15 +1,15 @@
 import 'dart:convert';
 import 'dart:typed_data';
-import 'package:shared_preferences/shared_preferences.dart';
 import '../models/channel_message.dart';
 import '../helpers/smaz.dart';
+import 'prefs_manager.dart';
 
 class ChannelMessageStore {
   static const String _keyPrefix = 'channel_messages_';
 
   /// Save messages for a specific channel
   Future<void> saveChannelMessages(int channelIndex, List<ChannelMessage> messages) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_keyPrefix$channelIndex';
 
     // Convert messages to JSON
@@ -21,7 +21,7 @@ class ChannelMessageStore {
 
   /// Load messages for a specific channel
   Future<List<ChannelMessage>> loadChannelMessages(int channelIndex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_keyPrefix$channelIndex';
 
     final jsonString = prefs.getString(key);
@@ -38,14 +38,14 @@ class ChannelMessageStore {
 
   /// Clear messages for a specific channel
   Future<void> clearChannelMessages(int channelIndex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_keyPrefix$channelIndex';
     await prefs.remove(key);
   }
 
   /// Clear all channel messages
   Future<void> clearAllChannelMessages() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final keys = prefs.getKeys().where((k) => k.startsWith(_keyPrefix));
     for (var key in keys) {
       await prefs.remove(key);
@@ -67,6 +67,10 @@ class ChannelMessageStore {
       'pathBytes': base64Encode(msg.pathBytes),
       'pathVariants': msg.pathVariants.map(base64Encode).toList(),
       'repeats': msg.repeats.map(_repeatToJson).toList(),
+      'messageId': msg.messageId,
+      'replyToMessageId': msg.replyToMessageId,
+      'replyToSenderName': msg.replyToSenderName,
+      'replyToText': msg.replyToText,
     };
   }
 
@@ -96,6 +100,10 @@ class ChannelMessageStore {
               .toList() ??
           const [],
       channelIndex: json['channelIndex'] as int?,
+      messageId: json['messageId'] as String?,
+      replyToMessageId: json['replyToMessageId'] as String?,
+      replyToSenderName: json['replyToSenderName'] as String?,
+      replyToText: json['replyToText'] as String?,
     );
   }
 

lib/storage/channel_order_store.dart

@@ -1,16 +1,16 @@
 import 'dart:convert';
-import 'package:shared_preferences/shared_preferences.dart';
+import 'prefs_manager.dart';
 
 class ChannelOrderStore {
   static const String _key = 'channel_order';
 
   Future<void> saveChannelOrder(List<int> order) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     await prefs.setString(_key, jsonEncode(order));
   }
 
   Future<List<int>> loadChannelOrder() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final raw = prefs.getString(_key);
     if (raw == null || raw.isEmpty) return [];
     try {

lib/storage/channel_settings_store.dart

@@ -1,16 +1,16 @@
-import 'package:shared_preferences/shared_preferences.dart';
+import 'prefs_manager.dart';
 
 class ChannelSettingsStore {
   static const String _smazKeyPrefix = 'channel_smaz_';
 
   Future<bool> loadSmazEnabled(int channelIndex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_smazKeyPrefix$channelIndex';
     return prefs.getBool(key) ?? false;
   }
 
   Future<void> saveSmazEnabled(int channelIndex, bool enabled) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_smazKeyPrefix$channelIndex';
     await prefs.setBool(key, enabled);
   }

lib/storage/contact_group_store.dart

@@ -1,12 +1,12 @@
 import 'dart:convert';
-import 'package:shared_preferences/shared_preferences.dart';
 import '../models/contact_group.dart';
+import 'prefs_manager.dart';
 
 class ContactGroupStore {
   static const String _key = 'contact_groups';
 
   Future<List<ContactGroup>> loadGroups() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final raw = prefs.getString(_key);
     if (raw == null || raw.isEmpty) return [];
 
@@ -25,7 +25,7 @@ class ContactGroupStore {
   }
 
   Future<void> saveGroups(List<ContactGroup> groups) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final encoded = jsonEncode(groups.map((group) => group.toJson()).toList());
     await prefs.setString(_key, encoded);
   }

lib/storage/contact_settings_store.dart

@@ -1,16 +1,16 @@
-import 'package:shared_preferences/shared_preferences.dart';
+import 'prefs_manager.dart';
 
 class ContactSettingsStore {
   static const String _smazKeyPrefix = 'contact_smaz_';
 
   Future<bool> loadSmazEnabled(String contactKeyHex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_smazKeyPrefix$contactKeyHex';
     return prefs.getBool(key) ?? false;
   }
 
   Future<void> saveSmazEnabled(String contactKeyHex, bool enabled) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_smazKeyPrefix$contactKeyHex';
     await prefs.setBool(key, enabled);
   }

lib/storage/contact_store.dart

@@ -1,15 +1,14 @@
 import 'dart:convert';
 import 'dart:typed_data';
 
-import 'package:shared_preferences/shared_preferences.dart';
-
 import '../models/contact.dart';
+import 'prefs_manager.dart';
 
 class ContactStore {
   static const String _key = 'contacts';
 
   Future<List<Contact>> loadContacts() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = prefs.getString(_key);
     if (jsonStr == null) return [];
 
@@ -22,7 +21,7 @@ class ContactStore {
   }
 
   Future<void> saveContacts(List<Contact> contacts) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonList = contacts.map(_toJson).toList();
     await prefs.setString(_key, jsonEncode(jsonList));
   }

lib/storage/message_store.dart

@@ -1,21 +1,21 @@
 import 'dart:convert';
 import 'dart:typed_data';
-import 'package:shared_preferences/shared_preferences.dart';
 import '../models/message.dart';
 import '../helpers/smaz.dart';
+import 'prefs_manager.dart';
 
 class MessageStore {
   static const String _keyPrefix = 'messages_';
 
   Future<void> saveMessages(String contactKeyHex, List<Message> messages) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_keyPrefix$contactKeyHex';
     final jsonList = messages.map(_messageToJson).toList();
     await prefs.setString(key, jsonEncode(jsonList));
   }
 
   Future<List<Message>> loadMessages(String contactKeyHex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_keyPrefix$contactKeyHex';
     final jsonString = prefs.getString(key);
     if (jsonString == null) return [];
@@ -29,7 +29,7 @@ class MessageStore {
   }
 
   Future<void> clearMessages(String contactKeyHex) async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final key = '$_keyPrefix$contactKeyHex';
     await prefs.remove(key);
   }
@@ -41,10 +41,6 @@ class MessageStore {
       'timestamp': msg.timestamp.millisecondsSinceEpoch,
       'isOutgoing': msg.isOutgoing,
       'isCli': msg.isCli,
-      'isVoice': msg.isVoice,
-      'voicePath': msg.voicePath,
-      'voiceDurationMs': msg.voiceDurationMs,
-      'voiceCodec': msg.voiceCodec,
       'status': msg.status.index,
       'messageId': msg.messageId,
       'retryCount': msg.retryCount,
@@ -69,10 +65,6 @@ class MessageStore {
       timestamp: DateTime.fromMillisecondsSinceEpoch(json['timestamp'] as int),
       isOutgoing: json['isOutgoing'] as bool,
       isCli: isCli,
-      isVoice: json['isVoice'] as bool? ?? false,
-      voicePath: json['voicePath'] as String?,
-      voiceDurationMs: json['voiceDurationMs'] as int?,
-      voiceCodec: json['voiceCodec'] as String?,
       status: MessageStatus.values[json['status'] as int],
       messageId: json['messageId'] as String?,
       retryCount: json['retryCount'] as int? ?? 0,

lib/storage/prefs_manager.dart

@@ -0,0 +1,33 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+/// Singleton wrapper for SharedPreferences to avoid redundant getInstance() calls.
+///
+/// BEFORE: Every storage operation called SharedPreferences.getInstance()
+/// AFTER: Single getInstance() on app startup, reused throughout lifecycle
+///
+/// This eliminates 30+ redundant platform channel calls across the app.
+class PrefsManager {
+  PrefsManager._();
+
+  static SharedPreferences? _instance;
+
+  /// Initialize the cached instance. Call this once during app startup in main().
+  static Future<void> initialize() async {
+    _instance ??= await SharedPreferences.getInstance();
+  }
+
+  /// Get the cached SharedPreferences instance.
+  /// Throws StateError if initialize() hasn't been called.
+  static SharedPreferences get instance {
+    if (_instance == null) {
+      throw StateError(
+          'PrefsManager not initialized. Call PrefsManager.initialize() in main() before use.');
+    }
+    return _instance!;
+  }
+
+  /// For testing: reset the instance
+  static void reset() {
+    _instance = null;
+  }
+}

lib/storage/unread_store.dart

@@ -1,13 +1,30 @@
+import 'dart:async';
 import 'dart:convert';
 
-import 'package:shared_preferences/shared_preferences.dart';
+import 'prefs_manager.dart';
 
+/// Storage for unread message tracking with debounced writes to reduce I/O.
 class UnreadStore {
   static const String _contactLastReadKey = 'contact_last_read';
   static const String _channelLastReadKey = 'channel_last_read';
 
+  // Debounce timers to batch rapid writes
+  Timer? _contactSaveTimer;
+  Timer? _channelSaveTimer;
+  static const Duration _saveDebounceDuration = Duration(milliseconds: 500);
+
+  // Pending write data
+  Map<String, int>? _pendingContactLastRead;
+  Map<int, int>? _pendingChannelLastRead;
+
+  /// Dispose timers when no longer needed
+  void dispose() {
+    _contactSaveTimer?.cancel();
+    _channelSaveTimer?.cancel();
+  }
+
   Future<Map<String, int>> loadContactLastRead() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = prefs.getString(_contactLastReadKey);
     if (jsonStr == null) return {};
 
@@ -19,14 +36,24 @@ class UnreadStore {
     }
   }
 
-  Future<void> saveContactLastRead(Map<String, int> lastReadMs) async {
+  /// Save contact last read timestamps with debouncing.
-    final prefs = await SharedPreferences.getInstance();
+  /// Writes are delayed by 500ms and batched to reduce I/O operations.
-    final jsonStr = jsonEncode(lastReadMs);
+  void saveContactLastRead(Map<String, int> lastReadMs) {
-    await prefs.setString(_contactLastReadKey, jsonStr);
+    _pendingContactLastRead = lastReadMs;
+
+    // Cancel existing timer
+    _contactSaveTimer?.cancel();
+
+    // Schedule new write
+    _contactSaveTimer = Timer(_saveDebounceDuration, () async {
+      if (_pendingContactLastRead != null) {
+        await _flushContactLastRead();
+      }
+    });
   }
 
   Future<Map<int, int>> loadChannelLastRead() async {
-    final prefs = await SharedPreferences.getInstance();
+    final prefs = PrefsManager.instance;
     final jsonStr = prefs.getString(_channelLastReadKey);
     if (jsonStr == null) return {};
 
@@ -38,10 +65,48 @@ class UnreadStore {
     }
   }
 
-  Future<void> saveChannelLastRead(Map<int, int> lastReadMs) async {
+  /// Save channel last read timestamps with debouncing.
-    final prefs = await SharedPreferences.getInstance();
+  /// Writes are delayed by 500ms and batched to reduce I/O operations.
-    final asString = lastReadMs.map((key, value) => MapEntry(key.toString(), value));
+  void saveChannelLastRead(Map<int, int> lastReadMs) {
+    _pendingChannelLastRead = lastReadMs;
+
+    _channelSaveTimer?.cancel();
+
+    _channelSaveTimer = Timer(_saveDebounceDuration, () async {
+      if (_pendingChannelLastRead != null) {
+        await _flushChannelLastRead();
+      }
+    });
+  }
+
+  Future<void> _flushContactLastRead() async {
+    if (_pendingContactLastRead == null) return;
+
+    final prefs = PrefsManager.instance;
+    final jsonStr = jsonEncode(_pendingContactLastRead);
+    await prefs.setString(_contactLastReadKey, jsonStr);
+    _pendingContactLastRead = null;
+  }
+
+  Future<void> _flushChannelLastRead() async {
+    if (_pendingChannelLastRead == null) return;
+
+    final prefs = PrefsManager.instance;
+    final asString =
+        _pendingChannelLastRead!.map((key, value) => MapEntry(key.toString(), value));
     final jsonStr = jsonEncode(asString);
     await prefs.setString(_channelLastReadKey, jsonStr);
+    _pendingChannelLastRead = null;
+  }
+
+  /// Immediately flush pending writes (call before app termination or disposal)
+  Future<void> flush() async {
+    _contactSaveTimer?.cancel();
+    _channelSaveTimer?.cancel();
+
+    await Future.wait([
+      _flushContactLastRead(),
+      _flushChannelLastRead(),
+    ]);
   }
 }

lib/utils/dialog_utils.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+import '../connector/meshcore_connector.dart';
+
+/// Shows a confirmation dialog before disconnecting from the device.
+/// Returns true if user confirmed and disconnect completed, false otherwise.
+Future<bool> showDisconnectDialog(
+  BuildContext context,
+  MeshCoreConnector connector,
+) async {
+  final confirmed = await showDialog<bool>(
+    context: context,
+    builder: (context) => AlertDialog(
+      title: const Text('Disconnect'),
+      content: const Text(
+          'Are you sure you want to disconnect from this device?'),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context, false),
+          child: const Text('Cancel'),
+        ),
+        TextButton(
+          onPressed: () => Navigator.pop(context, true),
+          child: const Text('Disconnect'),
+        ),
+      ],
+    ),
+  );
+
+  if (confirmed == true) {
+    await connector.disconnect();
+    return true;
+  }
+  return false;
+}

lib/utils/disconnect_navigation_mixin.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+import '../connector/meshcore_connector.dart';
+
+/// Mixin that automatically navigates back to scanner when disconnected.
+/// Use in State classes for screens that require active connection.
+mixin DisconnectNavigationMixin<T extends StatefulWidget> on State<T> {
+  /// Call this in your Widget build method to enable auto-navigation.
+  /// Returns true if still connected, false if navigation was triggered.
+  bool checkConnectionAndNavigate(MeshCoreConnector connector) {
+    if (!connector.isConnected) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) {
+          Navigator.popUntil(context, (route) => route.isFirst);
+        }
+      });
+      return false;
+    }
+    return true;
+  }
+}

lib/widgets/empty_state.dart

@@ -0,0 +1,46 @@
+import 'package:flutter/material.dart';
+
+/// A centered empty state display with icon, title, and optional subtitle/action.
+class EmptyState extends StatelessWidget {
+  final IconData icon;
+  final String title;
+  final String? subtitle;
+  final Widget? action;
+
+  const EmptyState({
+    super.key,
+    required this.icon,
+    required this.title,
+    this.subtitle,
+    this.action,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(icon, size: 64, color: Colors.grey[400]),
+          const SizedBox(height: 16),
+          Text(
+            title,
+            style: TextStyle(fontSize: 16, color: Colors.grey[600]),
+          ),
+          if (subtitle != null) ...[
+            const SizedBox(height: 8),
+            Text(
+              subtitle!,
+              style: TextStyle(fontSize: 14, color: Colors.grey[500]),
+              textAlign: TextAlign.center,
+            ),
+          ],
+          if (action != null) ...[
+            const SizedBox(height: 24),
+            action!,
+          ],
+        ],
+      ),
+    );
+  }
+}

lib/widgets/voice_message.dart

@@ -1,134 +0,0 @@
-import 'dart:async';
-
-import 'package:flutter/material.dart';
-import 'package:media_kit_fork/media_kit_fork.dart';
-
-import '../models/message.dart';
-
-class VoiceMessageBubble extends StatefulWidget {
-  final Message message;
-  final Color backgroundColor;
-  final Color textColor;
-  final Color metaColor;
-  final bool isOutgoing;
-
-  const VoiceMessageBubble({
-    super.key,
-    required this.message,
-    required this.backgroundColor,
-    required this.textColor,
-    required this.metaColor,
-    required this.isOutgoing,
-  });
-
-  @override
-  State<VoiceMessageBubble> createState() => _VoiceMessageBubbleState();
-}
-
-class _VoiceMessageBubbleState extends State<VoiceMessageBubble> {
-  late final Player _player;
-  StreamSubscription<Duration>? _durationSubscription;
-  StreamSubscription<bool>? _completeSubscription;
-  Duration _duration = Duration.zero;
-
-  @override
-  void initState() {
-    super.initState();
-    _player = Player();
-    final voicePath = widget.message.voicePath;
-    if (voicePath != null && voicePath.isNotEmpty) {
-      _player.open(Media(Uri.file(voicePath).toString()), play: false);
-    }
-    _durationSubscription = _player.stream.duration.listen((value) {
-      if (!mounted) return;
-      if (value > Duration.zero && value != _duration) {
-        setState(() {
-          _duration = value;
-        });
-      }
-    });
-    _completeSubscription = _player.stream.completed.listen((completed) {
-      if (!completed) return;
-      _player.seek(Duration.zero);
-      _player.pause();
-    });
-  }
-
-  @override
-  void dispose() {
-    _durationSubscription?.cancel();
-    _completeSubscription?.cancel();
-    _player.dispose();
-    super.dispose();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    final hasAudio = widget.message.voicePath != null && widget.message.voicePath!.isNotEmpty;
-    final fallbackDuration = Duration(milliseconds: widget.message.voiceDurationMs ?? 0);
-    final displayDuration = _duration > Duration.zero ? _duration : fallbackDuration;
-
-    return StreamBuilder<bool>(
-      stream: _player.stream.playing,
-      initialData: false,
-      builder: (context, playingSnapshot) {
-        final isPlaying = playingSnapshot.data ?? false;
-        return Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Row(
-              children: [
-                IconButton(
-                  icon: Icon(isPlaying ? Icons.pause : Icons.play_arrow),
-                  color: widget.textColor,
-                  onPressed: hasAudio
-                      ? () {
-                          if (isPlaying) {
-                            _player.pause();
-                          } else {
-                            _player.play();
-                          }
-                        }
-                      : null,
-                ),
-                Expanded(
-                  child: StreamBuilder<Duration>(
-                    stream: _player.stream.position,
-                    initialData: Duration.zero,
-                    builder: (context, positionSnapshot) {
-                      final position = positionSnapshot.data ?? Duration.zero;
-                      final progress = displayDuration.inMilliseconds > 0
-                          ? position.inMilliseconds / displayDuration.inMilliseconds
-                          : 0.0;
-                      return LinearProgressIndicator(
-                        value: progress.clamp(0.0, 1.0),
-                        backgroundColor: widget.metaColor.withValues(alpha: 0.2),
-                        valueColor: AlwaysStoppedAnimation<Color>(widget.textColor),
-                        minHeight: 4,
-                      );
-                    },
-                  ),
-                ),
-                const SizedBox(width: 8),
-                Text(
-                  _formatDuration(displayDuration),
-                  style: TextStyle(
-                    color: widget.metaColor,
-                    fontSize: 11,
-                  ),
-                ),
-              ],
-            ),
-          ],
-        );
-      },
-    );
-  }
-
-  String _formatDuration(Duration duration) {
-    final totalSeconds = duration.inSeconds;
-    final minutes = totalSeconds ~/ 60;
-    final seconds = totalSeconds % 60;
-    return '${minutes.toString().padLeft(2, '0')}:${seconds.toString().padLeft(2, '0')}';
-  }
-}

linux/flutter/generated_plugin_registrant.cc

@@ -6,14 +6,6 @@
 
 #include "generated_plugin_registrant.h"
 
-#include <media_kit_libs_linux/media_kit_libs_linux_plugin.h>
-#include <record_linux/record_linux_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
-  g_autoptr(FlPluginRegistrar) media_kit_libs_linux_registrar =
-      fl_plugin_registry_get_registrar_for_plugin(registry, "MediaKitLibsLinuxPlugin");
-  media_kit_libs_linux_plugin_register_with_registrar(media_kit_libs_linux_registrar);
-  g_autoptr(FlPluginRegistrar) record_linux_registrar =
-      fl_plugin_registry_get_registrar_for_plugin(registry, "RecordLinuxPlugin");
-  record_linux_plugin_register_with_registrar(record_linux_registrar);
 }

linux/flutter/generated_plugins.cmake

@@ -3,8 +3,6 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
-  media_kit_libs_linux
-  record_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -7,18 +7,14 @@ import Foundation
 
 import flutter_blue_plus_darwin
 import flutter_local_notifications
-import media_kit_libs_macos_audio
 import path_provider_foundation
-import record_macos
 import shared_preferences_foundation
 import sqflite_darwin
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FlutterBluePlusPlugin.register(with: registry.registrar(forPlugin: "FlutterBluePlusPlugin"))
   FlutterLocalNotificationsPlugin.register(with: registry.registrar(forPlugin: "FlutterLocalNotificationsPlugin"))
-  MediaKitLibsMacosAudioPlugin.register(with: registry.registrar(forPlugin: "MediaKitLibsMacosAudioPlugin"))
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
-  RecordMacOsPlugin.register(with: registry.registrar(forPlugin: "RecordMacOsPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
 }

pubspec.lock

@@ -1,14 +1,6 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      sha256: "2fde1607386ab523f7a36bb3e7edb43bd58e6edaf2ffb29d8a6d578b297fdbbd"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.0.7"
   args:
     dependency: transitive
     description:
@@ -138,7 +130,7 @@ packages:
     source: hosted
     version: "1.3.3"
   ffi:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: ffi
       sha256: "289279317b4b16eb2bb7e271abccd4bf84ec9bdcbe999e278a94b804f5630418"
@@ -304,14 +296,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.2"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      sha256: "492bd52f6c4fbb6ee41f781ff27765ce5f627910e1e0cbecfa3d9add5562604c"
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.7.2"
   intl:
     dependency: transitive
     description:
@@ -400,62 +384,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.11.1"
-  media_kit_fork:
-    dependency: "direct main"
-    description:
-      name: media_kit_fork
-      sha256: aa6e7bb6153545f64a3bcfcdeaf5d245328deedc004a17731bd0e0cf7b566981
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.0.3"
-  media_kit_libs_android_audio:
-    dependency: transitive
-    description:
-      name: media_kit_libs_android_audio
-      sha256: "8f8f9759e537e12d66f08bc4d5279eb1bb21a0ccc519ff3442c68a9f3b6dd68b"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.3.8"
-  media_kit_libs_audio:
-    dependency: "direct main"
-    description:
-      name: media_kit_libs_audio
-      sha256: "81bf506c234e81e3ec536ba72f8f700a928543c14c345220210cae0411636316"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.7"
-  media_kit_libs_ios_audio:
-    dependency: transitive
-    description:
-      name: media_kit_libs_ios_audio
-      sha256: "78ccf04e27d6b4ba00a355578ccb39b772f00d48269a6ac3db076edf2d51934f"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.4"
-  media_kit_libs_linux:
-    dependency: transitive
-    description:
-      name: media_kit_libs_linux
-      sha256: "2b473399a49ec94452c4d4ae51cfc0f6585074398d74216092bf3d54aac37ecf"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.2.1"
-  media_kit_libs_macos_audio:
-    dependency: transitive
-    description:
-      name: media_kit_libs_macos_audio
-      sha256: "3be21844df98f286de32808592835073cdef2c1a10078bac135da790badca950"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.4"
-  media_kit_libs_windows_audio:
-    dependency: transitive
-    description:
-      name: media_kit_libs_windows_audio
-      sha256: c2fd558cc87b9d89a801141fcdffe02e338a3b21a41a18fbd63d5b221a1b8e53
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.9"
   meta:
     dependency: transitive
     description:
@@ -489,7 +417,7 @@ packages:
     source: hosted
     version: "2.1.0"
   path:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: path
       sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
@@ -497,7 +425,7 @@ packages:
     source: hosted
     version: "1.9.1"
   path_provider:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: path_provider
       sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"
@@ -584,14 +512,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.1"
-  posix:
-    dependency: transitive
-    description:
-      name: posix
-      sha256: "6323a5b0fa688b6a010df4905a56b00181479e6d10534cecfecede2aa55add61"
-      url: "https://pub.dev"
-    source: hosted
-    version: "6.0.3"
   proj4dart:
     dependency: transitive
     description:
@@ -608,70 +528,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.1.5+1"
-  record:
-    dependency: "direct main"
-    description:
-      name: record
-      sha256: "6bad72fb3ea6708d724cf8b6c97c4e236cf9f43a52259b654efeb6fd9b737f1f"
-      url: "https://pub.dev"
-    source: hosted
-    version: "6.1.2"
-  record_android:
-    dependency: transitive
-    description:
-      name: record_android
-      sha256: "9aaf3f151e61399b09bd7c31eb5f78253d2962b3f57af019ac5a2d1a3afdcf71"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.5"
-  record_ios:
-    dependency: transitive
-    description:
-      name: record_ios
-      sha256: "69fcd37c6185834e90254573599a9165db18a2cbfa266b6d1e46ffffeb06a28c"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.5"
-  record_linux:
-    dependency: transitive
-    description:
-      name: record_linux
-      sha256: "235b1f1fb84e810f8149cc0c2c731d7d697f8d1c333b32cb820c449bf7bb72d8"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.2.1"
-  record_macos:
-    dependency: transitive
-    description:
-      name: record_macos
-      sha256: "842ea4b7e95f4dd237aacffc686d1b0ff4277e3e5357865f8d28cd28bc18ed95"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
-  record_platform_interface:
-    dependency: transitive
-    description:
-      name: record_platform_interface
-      sha256: b0065fdf1ec28f5a634d676724d388a77e43ce7646fb049949f58c69f3fcb4ed
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.4.0"
-  record_web:
-    dependency: transitive
-    description:
-      name: record_web
-      sha256: "3feeffbc0913af3021da9810bb8702a068db6bc9da52dde1d19b6ee7cb9edb51"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.2.2"
-  record_windows:
-    dependency: transitive
-    description:
-      name: record_windows
-      sha256: "223258060a1d25c62bae18282c16783f28581ec19401d17e56b5205b9f039d78"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.7"
   rxdart:
     dependency: transitive
     description:
@@ -680,14 +536,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.28.0"
-  safe_local_storage:
-    dependency: transitive
-    description:
-      name: safe_local_storage
-      sha256: e9a21b6fec7a8aa62cc2585ff4c1b127df42f3185adbd2aca66b47abe2e80236
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.1"
   shared_preferences:
     dependency: "direct main"
     description:
@@ -869,22 +717,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.3.1"
-  universal_platform:
-    dependency: transitive
-    description:
-      name: universal_platform
-      sha256: "64e16458a0ea9b99260ceb5467a214c1f298d647c659af1bff6d3bf82536b1ec"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.0"
-  uri_parser:
-    dependency: transitive
-    description:
-      name: uri_parser
-      sha256: "051c62e5f693de98ca9f130ee707f8916e2266945565926be3ff20659f7853ce"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.2"
   uuid:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -44,14 +44,8 @@ dependencies:
   crypto: ^3.0.3
   pointycastle: ^3.7.4
   http: ^1.2.0
-  ffi: ^2.1.3
   cached_network_image: ^3.4.1
   flutter_cache_manager: ^3.4.1
-  media_kit_fork: ^0.0.2
-  media_kit_libs_audio: ^1.0.5
-  path: ^1.9.0
-  path_provider: ^2.1.2
-  record: ^6.1.2
   flutter_foreground_task: ^6.1.2
 
 dev_dependencies:

third_party/codec2/.clang-format

@@ -1,168 +0,0 @@
----
-Language:        Cpp
-# BasedOnStyle:  Google
-AccessModifierOffset: -1
-AlignAfterOpenBracket: Align
-AlignConsecutiveMacros: false
-AlignConsecutiveAssignments: false
-AlignConsecutiveDeclarations: false
-AlignEscapedNewlines: Left
-AlignOperands:   true
-AlignTrailingComments: true
-AllowAllArgumentsOnNextLine: true
-AllowAllConstructorInitializersOnNextLine: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortBlocksOnASingleLine: Never
-AllowShortCaseLabelsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: All
-AllowShortLambdasOnASingleLine: All
-AllowShortIfStatementsOnASingleLine: WithoutElse
-AllowShortLoopsOnASingleLine: true
-AlwaysBreakAfterDefinitionReturnType: None
-AlwaysBreakAfterReturnType: None
-AlwaysBreakBeforeMultilineStrings: true
-AlwaysBreakTemplateDeclarations: Yes
-BinPackArguments: true
-BinPackParameters: true
-BraceWrapping:
-  AfterCaseLabel:  false
-  AfterClass:      false
-  AfterControlStatement: false
-  AfterEnum:       false
-  AfterFunction:   false
-  AfterNamespace:  false
-  AfterObjCDeclaration: false
-  AfterStruct:     false
-  AfterUnion:      false
-  AfterExternBlock: false
-  BeforeCatch:     false
-  BeforeElse:      false
-  IndentBraces:    false
-  SplitEmptyFunction: true
-  SplitEmptyRecord: true
-  SplitEmptyNamespace: true
-BreakBeforeBinaryOperators: None
-BreakBeforeBraces: Attach
-BreakBeforeInheritanceComma: false
-BreakInheritanceList: BeforeColon
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: false
-BreakConstructorInitializers: BeforeColon
-BreakAfterJavaFieldAnnotations: false
-BreakStringLiterals: true
-ColumnLimit:     80
-CommentPragmas:  '^ IWYU pragma:'
-CompactNamespaces: false
-ConstructorInitializerAllOnOneLineOrOnePerLine: true
-ConstructorInitializerIndentWidth: 4
-ContinuationIndentWidth: 4
-Cpp11BracedListStyle: true
-DeriveLineEnding: true
-DerivePointerAlignment: true
-DisableFormat:   false
-ExperimentalAutoDetectBinPacking: false
-FixNamespaceComments: true
-ForEachMacros:
-  - foreach
-  - Q_FOREACH
-  - BOOST_FOREACH
-IncludeBlocks:   Regroup
-IncludeCategories:
-  - Regex:           '^<ext/.*\.h>'
-    Priority:        2
-    SortPriority:    0
-  - Regex:           '^<.*\.h>'
-    Priority:        1
-    SortPriority:    0
-  - Regex:           '^<.*'
-    Priority:        2
-    SortPriority:    0
-  - Regex:           '.*'
-    Priority:        3
-    SortPriority:    0
-IncludeIsMainRegex: '([-_](test|unittest))?$'
-IncludeIsMainSourceRegex: ''
-IndentCaseLabels: true
-IndentGotoLabels: true
-IndentPPDirectives: None
-IndentWidth:     2
-IndentWrappedFunctionNames: false
-JavaScriptQuotes: Leave
-JavaScriptWrapImports: true
-KeepEmptyLinesAtTheStartOfBlocks: false
-MacroBlockBegin: ''
-MacroBlockEnd:   ''
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: None
-ObjCBinPackProtocolList: Never
-ObjCBlockIndentWidth: 2
-ObjCSpaceAfterProperty: false
-ObjCSpaceBeforeProtocolList: true
-PenaltyBreakAssignment: 2
-PenaltyBreakBeforeFirstCallParameter: 1
-PenaltyBreakComment: 300
-PenaltyBreakFirstLessLess: 120
-PenaltyBreakString: 1000
-PenaltyBreakTemplateDeclaration: 10
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 200
-PointerAlignment: Left
-RawStringFormats:
-  - Language:        Cpp
-    Delimiters:
-      - cc
-      - CC
-      - cpp
-      - Cpp
-      - CPP
-      - 'c++'
-      - 'C++'
-    CanonicalDelimiter: ''
-    BasedOnStyle:    google
-  - Language:        TextProto
-    Delimiters:
-      - pb
-      - PB
-      - proto
-      - PROTO
-    EnclosingFunctions:
-      - EqualsProto
-      - EquivToProto
-      - PARSE_PARTIAL_TEXT_PROTO
-      - PARSE_TEST_PROTO
-      - PARSE_TEXT_PROTO
-      - ParseTextOrDie
-      - ParseTextProtoOrDie
-    CanonicalDelimiter: ''
-    BasedOnStyle:    google
-ReflowComments:  true
-SortIncludes:    true
-SortUsingDeclarations: true
-SpaceAfterCStyleCast: false
-SpaceAfterLogicalNot: false
-SpaceAfterTemplateKeyword: true
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeCpp11BracedList: false
-SpaceBeforeCtorInitializerColon: true
-SpaceBeforeInheritanceColon: true
-SpaceBeforeParens: ControlStatements
-SpaceBeforeRangeBasedForLoopColon: true
-SpaceInEmptyBlock: false
-SpaceInEmptyParentheses: false
-SpacesBeforeTrailingComments: 2
-SpacesInAngles:  false
-SpacesInConditionalStatement: false
-SpacesInContainerLiterals: true
-SpacesInCStyleCastParentheses: false
-SpacesInParentheses: false
-SpacesInSquareBrackets: false
-SpaceBeforeSquareBrackets: false
-Standard:        Auto
-StatementMacros:
-  - Q_UNUSED
-  - QT_REQUIRE_VERSION
-TabWidth:        8
-UseCRLF:         false
-UseTab:          Never
-...
-

third_party/codec2/.github/workflows/cmake-sm1000.yml

@@ -1,43 +0,0 @@
-name: Build SM1000
-
-on: [pull_request]
-
-env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
-  BUILD_TYPE: Debug
-
-jobs:
-  build:
-    # The CMake configure and build commands are platform agnostic and should work equally
-    # well on Windows or Mac.  You can convert this to a matrix build if you need
-    # cross-platform coverage.
-    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    runs-on: ubuntu-22.04
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Install packages
-      shell: bash
-      run: |
-           sudo apt-get update
-           sudo apt-get install octave octave-common octave-signal liboctave-dev gnuplot sox p7zip-full python3-numpy valgrind 
-
-    - name: Install ST Standard Peripheral Library (SM1000)
-      working-directory: ${{github.workspace}}/stm32
-      shell: bash
-      run: git clone https://github.com/whimsicalraps/STM32F4xx_DSP_StdPeriph_Lib
-
-    - name: Install SM1000 prerequisites
-      working-directory: ${{github.workspace}}/stm32
-      shell: bash
-      run: sudo apt install gcc-arm-none-eabi
-
-    - name: Build SM1000
-      working-directory: ${{github.workspace}}/stm32
-      shell: bash
-      run: |
-           mkdir build_stm32
-           cd build_stm32
-           cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/STM32_Toolchain.cmake -DPERIPHLIBDIR=${{github.workspace}}/stm32/STM32F4xx_DSP_StdPeriph_Lib ..
-           make

third_party/codec2/.github/workflows/cmake.yml

@@ -1,58 +0,0 @@
-name: Build Codec2 for Linux
-
-on: [pull_request]
-
-env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
-  BUILD_TYPE: Debug
-
-jobs:
-  build:
-    # The CMake configure and build commands are platform agnostic and should work equally
-    # well on Windows or Mac.  You can convert this to a matrix build if you need
-    # cross-platform coverage.
-    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
-    runs-on: ubuntu-22.04
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Install packages
-      shell: bash
-      run: |
-           sudo apt-get update
-           sudo apt-get install octave octave-common octave-signal liboctave-dev gnuplot sox p7zip-full python3-numpy valgrind clang-format texlive-latex-base texlive-fonts-recommended texlive-fonts-extra texlive-latex-extra texlive-science texmaker texlive-bibtex-extra
-   
-    - name: Create Build Directory
-      shell: bash
-      run: mkdir $GITHUB_WORKSPACE/build_linux
-
-    - name: Configure codec2 CMake
-      shell: bash
-      working-directory: ${{github.workspace}}/build_linux
-      run: cmake -DUNITTEST=1 $GITHUB_WORKSPACE
-
-    - name: Build LPCNet and Run ctests
-      shell: bash
-      run: |
-           cd $HOME
-           git clone https://github.com/drowe67/LPCNet.git 
-           cd LPCNet && mkdir -p build_linux && cd build_linux 
-           cmake .. && make && ctest
-
-    - name: Build codec2 with LPCNet
-      working-directory: ${{github.workspace}}/build_linux
-      shell: bash
-      run: |
-           cmake -DLPCNET_BUILD_DIR=$HOME/LPCNet/build_linux -DUNITTEST=1 $GITHUB_WORKSPACE
-           make -j4
-      
-    - name: Run ctests
-      working-directory: ${{github.workspace}}/build_linux
-      shell: bash
-      run: ctest --output-on-failure
-
-    - name: Test library installation
-      working-directory: ${{github.workspace}}/build_linux
-      shell: bash
-      run: cmake --install . --prefix "$HOME/codec2_install" && rm -rf "$HOME/codec2_install"

third_party/codec2/.gitignore

@@ -1,8 +0,0 @@
-build_linux
-stm32/build_stm32
-stm32/libstm32f4.a
-stm32/unittest/lib/python/__pycache__/
-stm32/unittest/src/libstm32f4.a
-stm32/unittest/src/*.map
-stm32/unittest/test_run/
-*.pyc

third_party/codec2/COPYING

@@ -1,502 +0,0 @@
-                  GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 2.1, February 1999
-
- Copyright (C) 1991, 1999 Free Software Foundation, Inc.
- 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-[This is the first released version of the Lesser GPL.  It also counts
- as the successor of the GNU Library Public License, version 2, hence
- the version number 2.1.]
-
-                            Preamble
-
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-this license or the ordinary General Public License is the better
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-
-  When we speak of free software, we are referring to freedom of use,
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-CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
-LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
-RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
-FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
-SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
-DAMAGES.
-
-                     END OF TERMS AND CONDITIONS
-
-           How to Apply These Terms to Your New Libraries
-
-  If you develop a new library, and you want it to be of the greatest
-possible use to the public, we recommend making it free software that
-everyone can redistribute and change.  You can do so by permitting
-redistribution under these terms (or, alternatively, under the terms of the
-ordinary General Public License).
-
-  To apply these terms, attach the following notices to the library.  It is
-safest to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least the
-"copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the library's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Lesser General Public
-    License as published by the Free Software Foundation; either
-    version 2.1 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Lesser General Public License for more details.
-
-    You should have received a copy of the GNU Lesser General Public
-    License along with this library; if not, see 
-    <http://www.gnu.org/licenses/>. 
-
-Also add information on how to contact you by electronic and paper mail.
-
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the library, if
-necessary.  Here is a sample; alter the names:
-
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the
-  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
-
-  <signature of Ty Coon>, 1 April 1990
-  Ty Coon, President of Vice
-
-That's all there is to it!

third_party/codec2/README.md

@@ -1,293 +0,0 @@
-# Codec 2 README
-
-Codec 2 is an open source (LGPL 2.1) low bit rate speech codec: http://rowetel.com/codec2.html written in C99 standard C.
-
-Also included:
-
-  + The FreeDV API for digital voice over radio. FreeDV is an open source digital voice protocol that integrates modems, codecs, and FEC [README_freedv](README_freedv.md)
-  + HF OFDM and FSK modems, FEC used in the FreeDV API
-  + APIs for packet data over radio [README_data](README_data.md)
-  + An STM32 embedded version of FreeDV 1600/700D/700E for the [SM1000](stm32/README.md)
-
-## Old Code and Deprecated Features
-
-In July 2023 this repo was refactored, older code can be found in https://github.com/drowe67/codec2-dev. 
-
-We are currently conducting a major re-development of Codec 2, new speech coding, modems, and FreeDV modes are under active development.  We have limited resources available for maintenance or development on features that may soon be replaced (with the exception of major bugs).  We'd rather put our efforts into new features! Modes and Features we are not actively maintaining at present, and likely to be superseded in the near future include:
-1. FreeDV 1600, 700C, 700D, 700E, 2020.
-1. Codec 2 modes with the exception of Codec 2 3200 for M17.
-1. Our fork of LPCNet.
-1. The stm32/SM1000 firmware (paused until new modes available).
-
-The code supporting these modes won't be going away any time soon (and we will continue to include any modes/code in popular use), but we have chosen not to actively develop it at this time.
-
-## Pull Requests, Feature Requests
-
-We have a process for considering Feature Requests and Pull Requests that we will guide you through.
-
-If you have a Feature Request, please answer the questions in the [Feature Request Form](https://freedv.org/wp-content/uploads/sites/8/2024/03/FreeDV-027-Feature-Request-Form-V1.1.pdf), and submit your answers as a GitHub Issue.
-
-Before writing any code or submitting a PR - **please discuss** the PR with developers by raising a GitHub Issue. We have many years of experience and a carefully considered plan for Codec 2 development, and can guide you on work that will most benefit this project.
-
-Some key guidelines about the code in the `codec2` repo:
-1. Only code that is required to build, test, or document libcodec2 goes in codec2.
-2. Experimental work, code used for algorithm development, should probably go into some other repo.
-3. Only widely used “production” code goes in codec2. If it has an user base of < 2 (e.g. personal projects, early R&D) - it should probably be application code or a fork.
-
-## Ports to non C99 Compilers
-
-For Windows applications (built with MSVC or any compiler) we recommend linking with our [cross-compiled](#building-for-windows) Codec 2 DLLs.  This lets you enjoy the benefits of our carefully developed, tested and maintained codebase without having to develop and maintain your own fork.
-
-We have standardized on C99 and develop and test using gcc on a Linux platform.  Our focus needs to be on what’s unique about our project – the speech codec and modem waveforms, and we lack the resources to support multiple compilers.  If you want to build Codec 2 using a non-standard compiler like MSVC and certain embedded compilers you will need to maintain your own Codec 2 fork (a very large commitment).  If you decide to fork Codec 2 to a non C99 compiler - please ensure you port the ctests and that they all pass.  If the tests have not been ported or do not pass - it's not Codec 2.
-
-## Quickstart
-
-1. Install packages (Debian/Ubuntu):
-   ```
-   sudo apt install git build-essential cmake
-   ```
-   Fedora/RH distros:
-   ```
-   sudo dnf groupinstall "Development Tools" "C Development Tools and Libraries"
-   sudo dnf install cmake
-   ```
-   
-1. Build Codec 2:
-   ```
-   git clone https://github.com/drowe67/codec2.git
-   cd codec2
-   mkdir build_linux
-   cd build_linux
-   cmake ..
-   make
-   ```
-
-1. Listen to Codec 2:
-   ```
-   cd codec2/build_linux
-   ./demo/c2demo ../raw/hts1a.raw hts1a_c2.raw
-   aplay -f S16_LE ../raw/hts1a.raw
-   aplay -f S16_LE hts1a_c2.raw
-   ```
-1. Compress, decompress and then play a file using Codec 2 at 2400 bit/s:
-   ```
-   ./src/c2enc 2400 ../raw/hts1a.raw hts1a_c2.bit
-   ./src/c2dec 2400 hts1a_c2.bit hts1a_c2_2400.raw 
-   ```
-   which can be played with:
-   ```
-   aplay -f S16_LE hts1a_c2_2400.raw
-   ```
-   Or using Codec 2 using 700C (700 bits/s):
-   ```
-   ./src/c2enc 700C ../raw/hts1a.raw hts1a_c2.bit
-   ./src/c2dec 700C hts1a_c2.bit hts1a_c2_700.raw
-   aplay -f S16_LE hts1a_c2_700.raw
-   ```
-1. If you prefer a one-liner without saving to files:
-   ```
-   ./src/c2enc 1300 ../raw/hts1a.raw - | ./src/c2dec 1300 - - | aplay -f S16_LE
-   ```
-
-1. Or you can use your microphone and headphones to encode and listen to the result on the fly:
-   ```
-   br=1300; arecord -f S16_LE -c 1 -r 8000 | ./src/c2enc $br - - | ./src/c2dec $br - - | aplay -f S16_LE -
-   ```
-   
-## FreeDV 2020 support (building with LPCNet)
-
-1. Build LPCNet:
-   ```
-   cd ~
-   git clone https://github.com/drowe67/LPCNet
-   cd LPCNet && mkdir build_linux && cd build_linux
-   cmake .. 
-   make
-   ```
-
-1. Build Codec 2 with LPCNet support:
-   ```
-   cd ~/codec2/build_linux && rm -Rf *
-   cmake -DLPCNET_BUILD_DIR=~/LPCNet/build_linux ..
-   make
-   ```
-
-## Documentation
-
-An algorithm description can be found in `doc/codec2.pdf`.
-
-## Programs
-
-+ See `demo` directory for simple examples of using Codec and the FreeDV API.
-
-+ `c2demo` encodes a file of speech samples, then decodes them and saves the result.
-
-+ `c2enc` encodes a file of speech samples to a compressed file of encoded bits.  `c2dec` decodes a compressed file of bits to a file of speech samples.
-
-+ `c2sim` is a simulation/development version of Codec 2.  It allows selective use of the various Codec 2 algorithms.  For example switching phase modelling or quantisation on and off.
-
-+ `freedv_tx` & `freedv_rx` are command line implementations of the FreeDV protocol, which combines Codec 2, modems, and Forward Error Correction (FEC).
-  
-+ `cohpsk_*` are coherent PSK (COHPSK) HF modem command line programs.
-
-+ `fdmdv_*` are differential PSK HF modem command line programs (README_fdmdv).
-
-+ `fsk_*` are command line programs for a non-coherent FSK modem (README_fsk).
-
-+ `ldpc_*` are LDPC encoder/decoder command line programs, based on the CML library.
-
-+ `ofdm_*` are OFDM PSK HF modem command line programs (README_ofdm).
-
-## Building and Running Unit Tests
-
-CTest is used as a test framework, with support from [GNU Octave](https://www.gnu.org/software/octave/) scripts.
-
-1. Install GNU Octave and libraries on Ubuntu with:
-   ```
-   sudo apt install octave octave-common octave-signal liboctave-dev gnuplot python3-numpy sox valgrind clang-format texmaker texlive-bibtex-extra texlive-science
-   ```
-1. To build and run the tests:
-   ```
-   cd ~/codec2
-   rm -Rf build_linux && mkdir build_linux
-   cd build_linux
-   cmake -DUNITTEST=1 ..
-   make
-   ```
-
-1. To just run tests without rebuilding:
-   ```
-   ctest
-   ```
-
-1. To get a verbose run (e.g. for test debugging):
-   ```
-   ctest -V
-   ```
-
-1. To just run a single test:
-   ```
-   ctest -R test_OFDM_modem_octave_port
-   ```
-
-1. To list the available tests:
-   ```
-   ctest -N
-   ```
-
-1. Many Octave scripts rely on the CML LDPC library.  To run these from the Octave CLI, you need to set
-   the `CML_PATH` environment variable.  A convenient way to do this is using a `.octaverc` file
-   in your `codec/octave` directory.  For example on a Linux machine, create a `.octaverc` file:
-   ```
-   setenv("CML_PATH","../build_linux/cml")
-   ```  
-   
-## Directories
-```
-cmake       - cmake support files
-demo        - Simple Codec 2 and FreeDv API demo applications
-doc         - documentation
-octave      - Octave scripts used to support ctests
-src         - C source code for Codec 2, FDMDV modem, COHPSK modem, FreeDV API
-raw         - speech files in raw format (16 bits signed linear 8 kHz)
-stm32       - STM32F4 microcontroller and SM1000 FreeDV Adaptor support
-unittest    - Code to perform and support testing. Part of Debug build.
-wav         - speech files in wave file format
-```
-## GDB and Dump Files
-
-1. To compile with debug symbols for using gdb:
-   ```
-   cd ~/codec2
-   rm -Rf build_linux && mkdir build_linux
-   cd build_linux
-   CFLAGS=-g cmake ..
-   make
-   ```
-
-## Building for Windows
-
-We develop and test on Linux to the [C99 standard](#ports-to-non-c99-compilers). We recommend using MinGW to cross compile for Windows.
-
-On Ubuntu Linux:
-   ```
-   sudo apt-get install mingw-w64
-   mkdir build_windows && cd build_windows
-   cmake .. -DCMAKE_TOOLCHAIN_FILE=/home/david/freedv-dev/cmake/Toolchain-Ubuntu-mingw32.cmake -DUNITTEST=FALSE -DGENERATE_CODEBOOK=/home/david/codec2/build_linux/src/generate_codebook 
-   make
-   ```
-   
-This will create a working `libcodec2.dll` file for use with other applications (e.g. FreeDV GUI which is in wide spread use on Windows).  Please note the utility/development command line applications (e.g. `freedv_rx.exe`) may not work exactly the same on the Windows CLI compared to running on a Unix machine/shell.  For example pipes may not function as expected, and ctests are not supported.  Our primary development and test environment is Linux, and we lack the resources to support and maintain these applications for other operating systems.
-
-## Including Codec 2 in an Android project
-
-In an Android Studio 'NDK' project (a project that uses 'native' code)
-Codec 2 can be added to the project in the following way.
-
-1. Add the Codec 2 source tree to your app (e.g. in app/src/main/codec2)
-   (e.g. as a git sub-module).
-
-1. Add Codec 2 to the CMakeList.txt (app/src/main/cpp/CMakeLists.txt):
-
-    ```
-    # Sets lib_src_DIR to the path of the target CMake project.
-    set( codec2_src_DIR ../codec2/ )
-    # Sets lib_build_DIR to the path of the desired output directory.
-    set( codec2_build_DIR ../codec2/ )
-    file(MAKE_DIRECTORY ${codec2_build_DIR})
-
-    add_subdirectory( ${codec2_src_DIR} ${codec2_build_DIR} )
-
-    include_directories(
-	    ${codec2_src_DIR}/src
-	    ${CMAKE_CURRENT_BINARY_DIR}/../codec2
-    )
-    ```
-     
-1. Add Codec 2 to the target_link_libraries in the same file.
-
-## Building Codec 2 for Microcontrollers
-
-Codec 2 requires a hardware Floating Point Unit (FPU) to run in real time.
-
-Two build options have been added to support building on microcontrollers:
-1. Setting the `cmake` variable MICROCONTROLLER_BUILD disables position independent code (-fPIC is not used).  This was required for the IMRT1052 used in Teensy 4/4.1).
-
-1. On ARM machines, setting the C Flag \_\_EMBEDDED\_\_ and linking with the ARM CMSIS library will improve performance on ARM-based microcontrollers. \_\_REAL\_\_ and FDV\_ARM\_MATH are additional ARM-specific options that can be set to improve performance if required, especially with OFDM modes.
-
-A CMakeLists.txt example for a microcontroller is below:
-
-```
-set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
-set(MICROCONTROLLER_BUILD 1)
-
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mlittle-endian -ffunction-sections -fdata-sections -g -O3")
-set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -ffunction-sections -fdata-sections")
-
-add_definitions(-DCORTEX_M7 -D__EMBEDDED__)
-add_definitions(-DFREEDV_MODE_EN_DEFAULT=0 -DFREEDV_MODE_1600_EN=1 -DFREEDV_MODE_700D_EN=1 -DFREEDV_MODE_700E_EN=1 -DCODEC2_MODE_EN_DEFAULT=0 -DCODEC2_MODE_1300_EN=1 -DCODEC2_MODE_700C_EN=1)
-                    
-FetchContent_Declare(codec2
-    GIT_REPOSITORY https://github.com/drowe67/codec2.git
-    GIT_TAG origin/main
-    GIT_SHALLOW ON
-    GIT_PROGRESS ON
-)
-FetchContent_GetProperties(codec2)
-if(NOT ${codec2_POPULATED})
-    FetchContent_Populate(codec2)
-endif()
-set(CMAKE_REQUIRED_FLAGS "")
-
-set(LPCNET OFF CACHE BOOL "")
-add_subdirectory(${codec2_SOURCE_DIR} ${codec2_BINARY_DIR} EXCLUDE_FROM_ALL)
-```
-
-## Building Debian packages
-
-To build Debian packages, simply run the "cpack" command after running "make". This will generate the following packages:
-
-+ codec2: Contains the .so and .a files for linking/executing applications dependent on Codec2.
-* codec2-dev: Contains the header files for development using Codec2.
-
-Once generated, they can be installed with "dpkg -i" (once LPCNet is installed). If LPCNet is not desired, CMakeLists.txt can be modified to remove that dependency.

third_party/codec2/README_cohpsk.md

@@ -1,43 +0,0 @@
-# README_cohpsk.md
-
-## Introduction
-
-## Quickstart
-
-1. BER test in AWGN channel with just less that 2% average bit error rate:
-
-   ```
-    $ ./cohpsk_get_test_bits - 5600 | ./cohpsk_mod - - | ./ch - - --No -30 --Fs 7500 | ./cohpsk_demod - - | ./cohpsk_put_test_bits -
-    <snip>
-    SNR3k(dB):  3.41 C/No: 38.2 PAPR:  8.1 
-    BER: 0.017 Nbits: 5264 Nerrors: 92
-
-  ```
-
-2. Plot some of the demod internal states, used to chase down freq offset problemL
-
-   ```
-    $ cd build_linux/src
-    $ ./cohpsk_get_test_bits - 5600 | ./cohpsk_mod - -  | ./ch - - --No -40 -f -20 --Fs 7500 | ./cohpsk_demod -o cohpsk_demod.txt - - | ./cohpsk_put_test_bits -
-    $ cd ../../octave
-    $ octave --no-gui
-    $ cohpsk_demod_plot("../build_linux/src/cohpsk_demod.txt")    
-   ```
-
-3. Run Octave<-> tests
-
-   ```
-   $ cd ~/codec2/build_linux/unittest
-   $ ./tochpsk
-   $ cd ~/codec2/octave
-   $ octave --no-gui
-   octave> tcohpsk
-   ```
-   
-## References
-
-## C Code
-
-## Octave Scripts
-
-

third_party/codec2/README_data.md

@@ -1,378 +0,0 @@
-# README_data.md
-
-# Introduction
-
-FreeDV can be used to send data over radio channels.  Two APis are supported:
-+ VHF packet data channel which uses Ethernet style framing.
-+ Raw frames of modem data over VHF and HF channels.
-
-## Credits
-
-The VHF data channel was developed by Jeroen Vreeken.
-
-## Quickstart
-
-Raw modem frame API:
-
-1. Let's send a 128 byte frame containing some text over the modem:
-   ```sh
-   padding=$(head -c 115 < /dev/zero | tr '\0' '-'); echo "Hello World" $padding > in.txt
-   ./src/freedv_data_raw_tx --bursts 1 datac3 in.txt - | ./src/freedv_data_raw_rx --framesperburst 1 datac3 - - 
-   Hello World --------
-   ```
-   Note we've padded the input frame to 126 bytes, the DATAC3 framesize (less CRC).
-
-VHF packet data API:
-
-1. Simple test using mode 2400A and VHF packet data
-
-   ```sh
-   $ cd ~/codec2/build_linux
-   $ ./src/freedv_data_tx 2400A - --frames 15 | ./src/freedv_data_rx 2400A -  
-
-   ```
-   You can listen to the modem signal using:
-   ```sh
-   $ ./src/freedv_data_tx 2400A - --frames 15 | aplay -f S16_LE -r 48000
-
-   ```
-
-2. Same for 2400B and 800XA
-
-   ```sh
-   $ ./src/freedv_data_tx 2400B - --frames 15 | ./src/freedv_data_rx 2400B -  
-   $ ./src/freedv_data_tx 800XA - --frames 15 | ./src/freedv_data_rx 800XA -  
-
-   ```
-
-3. Using a different callsign and secondary station id
-
-   ```sh
-   $ ./src/freedv_data_tx 2400A - --callsign T3ST --ssid 15 --frames 15 | src/freedv_data_rx 2400A -  
-   ```
-
-# Raw Data using the FreeDV API
-
-The raw data API can be used to send frames of bytes over radio channels.   The frames are protected with FEC and have a 16-bit checksum to verify correct transmission.  However the raw data API may lose frames due to channel impairments, loss of sync, or acquisition delays.  The caller must handle these situations.  The caller is also responsible for segmentation/re-assembly of the modem frames into larger blocks of data.
-
-Several modes are available which support FSK and OFDM modulation. FSK is aimed at VHF And UHF applications, and the OFDM modes have been optimised for multipath HF radio channels.
-
-For simple examples of how use the FreeDV API with raw data frames, see the demo programs [freedv_data1_tx.c](demo/freedv_data1_tx.c) and [freedv_data1_rx.c](src/freedv_data1_rx.c) The full featured sample programs [freedv_data_raw_tx.c](src/freedv_data_raw_tx.c) and [freedv_data_raw_rx.c](src/freedv_data_raw_rx.c) can be used to experiment with the raw data API.  
-
-## FSK LDPC Raw Data Mode
-
-The FSK_LDPC mode uses 2 or 4 FSK in combination with powerful LDPC codes, and was designed for VHF or UHF AWGN channels. Parameters such as the number of FSK tones, sample rate, symbol rate, and LDPC code can be selected at initialisation time.  The frame format is:
-```
-| Preamble | UW | payload data | CRC | parity | UW | payload data | CRC | parity | ........... |
-           | frame 1 -------------------------| frame 2 -------------------------| ... frame n |
-```
-Only one preamble is transmitted for each data burst, which can contain as many frames as you like.  Each frame starts with a 32 bit Unique Word (UW), then the FEC codeword consisting of the data and parity bits.  At the end of the data bits, we reserve 16 bits for a CRC.
-
-Here is an example of sending some text:
-```
-$ cd codec2/build_linux/src
-$ echo 'Hello World                    ' |
-  ./freedv_data_raw_tx FSK_LDPC - - 2>/dev/null |
-  ./freedv_data_raw_rx FSK_LDPC - - 2>/dev/null |
-  hexdump -C
-00000000  48 65 6c 6c 6f 20 57 6f  72 6c 64 20 20 20 20 20  |Hello World     |
-00000010  20 20 20 20 20 20 20 20  20 20 20 20 20 20        |              ..|
-00000020
-```
-Notes:
-1. The input data is padded to 30 bytes.  The (512,256) code sends 256 data bits every frame, we reserve 16 for a CRC, so there are 240 bits, or 30 bytes of payload data required for one frame.
-1. The '2>/dev/null' command redirects stderr to nowhere, removing some of the debug information the test programs usually display to make this example easier to read.
-
-When testing, it's convenient to use an internal source of test data. Here is an example where we send a single burst of 10 test frames:
-```
-$ cd codec2/build_linux/src
-$ ./freedv_data_raw_tx --testframes 10 FSK_LDPC /dev/zero - | ./freedv_data_raw_rx --testframes FSK_LDPC - /dev/null
-Nbits: 50 N: 4000 Ndft: 1024
-bits_per_modem_frame: 256 bytes_per_modem_frame: 32
-bytes_per_modem_frame: 32
-Frequency: Fs:  8.0 kHz Rs:  0.1 kHz Tone1:  1.0 kHz Shift:  0.2 kHz M: 2
-
-frames processed: 131  output bytes: 320 output_packets: 10
-BER......: 0.0000 Tbits:  5440 Terrs:     0
-Coded BER: 0.0000 Tbits:  2560 Terrs:     0
-```
-The default is 100 bits/s 2FSK. The (512,256) code sends 256 data bits (32 bytes) with every codeword, the remaining 256 bits reserved for parity.  The `--testframes` mode reports `320 output bytes` (10 frames where sent), and `Tbits: 2560`, so all of our data made it through.
-
-In real world operation, 16 of the data bits are reserved for a CRC, leaving 240 payload data bits per frame. Taking into account the overhead of the UW, CRC, and parity bits, we send 240 payload data bits for every out of 544, so the payload data rate in this example is (240/512)*(100 bits/s) = 44.1 bits/s.
-
-We can add some channel noise using the `ch` tool and see how it performs:
-```
-$ ./freedv_data_raw_tx --testframes 1 --bursts 10 FSK_LDPC /dev/zero - |
-  ./ch - - --No -5 --ssbfilt 0 |
-  ./freedv_data_raw_rx --testframes -v FSK_LDPC - /dev/null
-<snip>
-frames processed: 336  output bytes: 320 output_packets: 10
-BER......: 0.0778 Tbits:  5440 Terrs:   423
-SNR3k(dB): -13.00 C/No: 21.8 PAPR:  7.5
-Coded BER: 0.0000 Tbits:  2560 Terrs:     0
-```
-The `ch` stderr reporting is mixed up with the testframes results but we can see that over a channel with a -13dB SNR, we obtained a raw bit error rate of 0.0778 (nearly 8%).  However the LDPC code cleaned that up nicely and still received all 10 packets with no errors.
-
-Here is an example running 4FSK at 20000 bits/s (10000 symbols/s), at a sample rate of 200 kHz:
-```
-$./freedv_data_raw_tx -m 4 --Fs 200000 --Rs 10000 --tone1 10000 --shift 10000 --testframes 100 --bursts 10 FSK_LDPC /dev/zero - |
- ./ch - - --No -12 --ssbfilt 0 |
- ./freedv_data_raw_rx -m 4 --testframes -v --Fs 200000 --Rs 10000 FSK_LDPC --mask 10000 - /dev/null
- <snip>
- frames processed: 5568  output bytes: 30144 output_packets: 942
-BER......: 0.0691 Tbits: 528224 Terrs: 36505
-Coded BER: 0.0022 Tbits: 248576 Terrs:   535
-```
-Some notes on this example:
-1. We transmit 10 bursts, each of 100 frames in length, 1000 packets total.  There are a couple of frames silence between each burst.  This gives the acquisition algorithms a good work out.
-1. Only 942 packets make it though this rather noisy channel, a 6% Packet Error Rate (PER).  In a real world application, a higher protocol layer would need to detect this, and arrange for re-transmission of missing packets.  If the SNR was a few dB better, all 1000 packets would likely make it through.  If it was 1dB worse, nothing would get through; LDPC codes have a very sharp "knee" in the PER versus SNR curve.
-1. Our first tone `--tone` is at 10kHz, and each tone is spaced `--shift` by 10kHz, so we have FSK tones at 10,20,30, and 40 kHz.  For good performance, FSK tones must be spaced by at least the symbol rate Rs.
-1. Although the `ch` utility is designed for 8kHz sample rate operation, it just operates on sampled signals, so it's OK to use at higher sample rates.  It does have some internal filtering so best to keep your signal well away from 0 and (sample rate)/2.  The SNR measurement is calibrated to a 3000 Hz noise bandwidth, so won't make much sense at other sample rates.  The third argument `-12` sets the noise level of the channel.
-1. The `--mask` frequency offset algorithm is used, which gives better results on noisy channels, especially for 4FSK.
-
-## Reading Further
-
-1. Examples in the [ctests](CMakeLists.txt).
-1. [FSK_LDPC blog post](http://www.rowetel.com/?p=7467)
-
-# OFDM Raw Data modes for HF Radio
-
-These modes use an OFDM modem with powerful LDPC codes and are designed for sending data over HF radio channels with multipath fading.  The current modes supported are:
-
-| FreeDV Mode | RF bandwidth (Hz) | Payload data rate bits/s | Payload bytes/frame | FEC | Duration (sec) | MPP test | Use case |
-| :-: | :-: | :-: | :-: | :-: | :-: | :-: | :-: |
-| DATAC0 | 500 | 291 | 14 | (256,128) | 0.44 | 70/100 at 0dB | Reverse link ACK packets |
-| DATAC1 | 1700 | 980 | 510 | (8192,4096) | 4.18 | 92/100 at 5dB | Forward link data (medium SNR) |
-| DATAC3 | 500 | 321 | 126 | (2048,1024) | 3.19 | 74/100 at 0dB | Forward link data (low SNR) |
-| DATAC4 | 250 | 87 | 56 | (1472,448) | 5.17 | 90/100 at -4dB | Forward link data (low SNR) |
-| DATAC13 | 200 | 64 | 14 | (384,128) | 2.0 | 90/100 at -4dB | Reverse link ACK packets (low SNR) |
-| DATAC14 | 250 | 58 | 3 | (112,56) | 0.69 | 90/100 at -2dB | Reverse link ACK packets (low SNR) |
-
-Notes:
-1. 16 bits (2 bytes) per frame are reserved for a 16 bit CRC, e.g. for `datac3` we have 128 byte frames, and 128-2=126 bytes/frame of payload data.
-1. SNR is the target operating point SNR for each mode.
-1. "MPP test" is the number of packets received/transmitted on a simulated MultiPath Poor channel (1Hz Doppler spread, 2ms delay) at the operating point SNR.
-
-From the callers point of view, the frame format of each burst is:
-```
-| Preamble | payload data | CRC | payload data | CRC | ........... | Postamble | 
-           | frame 1 -----------| frame 2 -----------| ... frame N |
-```
-In the next layer down, each frame is comprised of several OFDM "modem frames", that contain pilot, unique word, and FEC symbols to handle synchronisation and error correction over the challenging HF channel.  The preamble and postamble are used to locate the burst and estimate it's frequency offset.  Having both a pre and postamble increases the probability of successful detection of the burst in a fading channel. Here are some single frame bursts on a MPP channel at 5dB SNR:
-
-![](doc/pre_post_amble_mpp.png)
-
-You can see what a mess the MPP channel makes.  Sometimes we find the pre-amble, other times the post-amble.  Using both increases the probability of detecting the burst, it's a form of time diversity.  If the probability of missing the pre-amble is P(fail)=0.1, then the probability of missing the pre and post-amble is P(fail)*P(fail)=0.01. If we find either we can work out where the burst starts and start demodulating.
-
-Here is an example of sending 3 bursts of 2 frames/burst, a total of 6 frames:
-```
-./src/freedv_data_raw_tx --framesperburst 2 --bursts 3 --testframes 6 DATAC0 /dev/zero - |
-./src/freedv_data_raw_rx --framesperburst 2 --testframes DATAC0 - /dev/null --vv
-<snip>
-BER......: 0.0000 Tbits:  1536 Terrs:     0
-Coded BER: 0.0000 Tbits:   768 Terrs:     0
-Coded PER: 0.0000 Tpkts:     6 Tpers:     0
-```
-
-Lets add some noise and a 20 Hz frequency offset:
-```
-./src/freedv_data_raw_tx --framesperburst 2 --bursts 3 --testframes 6 DATAC0 /dev/zero - |
-./src/ch - - --No -14 -f 20 |
-./src/freedv_data_raw_rx --framesperburst 2 --testframes DATAC0 - /dev/null
-<snip>
-mark:space: 0.79 SNR offset: -1.03
-ch: SNR3k(dB):    -0.96  C/No....:    33.82
-ch: peak.....: 16394.23  RMS.....:  9814.35   CPAPR.....:  4.46 
-ch: Nsamples.:    33440  clipped.:     0.00%  OutClipped:  0.03%
-modembufs:     35 bytes:    84 Frms.:     6 SNRAv: -1.15
-BER......: 0.0319 Tbits:  1536 Terrs:    49
-Coded BER: 0.0000 Tbits:   768 Terrs:     0
-Coded FER: 0.0000 Tfrms:     6 Tfers:     0
-```
-We still received 6 frames OK (Tpkts field), but in this case there was a raw BER of about 3% which the FEC cleaned up nicely (Coded BER 0.0).  Just above that we can see the "SNR offset" and "ch: SNR3k" fields.  In the silence between bursts the modem signal has zero power, which biases the SNR measured by the `ch` channel simulation tool.  This bias is the "SNR offset".  So the true SNR for this test is actually:
-```
-SNR = -1.15 - (-1.03) = -0.12 dB
-```
-The same offset applies the the Peak to Average Power measurement (CPAPR) returned by the `ch` tool, but in the other direction.  So the unbiased CPAPR is:
-```
-CPAPR = 4.46 - 1.03 = 3.43 dB
-```
-CPAPR refers to the PAPR of the complex valued signal.
-
-In the `raw` directory is a real world off-air sample of a signal sent between Adelaide and Melbourne (800km) using about 20W on 40m.  This can be decoded with:
-```
-./src/freedv_data_raw_rx datac1 --framesperburst 1 --testframes ../raw/test_datac1_006.raw /dev/null --vv
-<snip>
-BER......: 0.0134 Tbits: 73728 Terrs:   986
-Coded BER: 0.0000 Tbits: 36864 Terrs:     0
-Coded PER: 0.0000 Tpkts:     9 Tpers:     0
-```
-
-It's also useful to listen to the file, you can hear co-channel SSB, the bursts starting and stopping, and some fading:
-```
-aplay -f S16_LE ../raw/test_datac1_006.raw
-```
-
-Here is a spectrogram (waterfall on it's side - time flows from left to right, frequency on the Y axis):
-
-![](doc/test_datac1_006_spectrogram.png)
-
-The multipath channel carves notches out of the signal, and the level rises and falls.  The 27 carriers of the `datac1` channel can also be observed.  The SSB is the fuzz along the top. The SNR varied between 8 and 16dB. The fading is even more obvious on the scatter diagram:
-
-![](doc/test_datac1_006_scatter.png)
-
-The X shape is due to the level of each carrier changing with the fading.  In some cases a carrier is faded down to zero.  The FEC helps clean up any errors due to faded carriers.
-
-## Modem Performance and Throughput
-
-The following curves illustrate the OFDM raw data mode performance and throughput over AWGN and MPP channels:
-
-![](doc/c_tx_comp.png)
-![](doc/c_tx_comp_thruput.png)
-
-The signalling modes (`datac0` and `datac13`) tend to have a "long PER tail" at they are short in duration compared to the fading period.  The throughput curve can be used as a guide for "gear shifting" between modes. These curves were generated by [snr_curves.sh](../unittest/raw_data_curves/snr_curves.sh)
-
-## SNR estimation and clipping
-
-The modem estimates the SNR of every received packet, which can be useful for selecting the best mode to maximise bit rate while minimising packet error rate.
-
-Clipping (compression) is enabled by default on each modem waveform to maximise the Peak to Average Power Ratio (PAPR).  Power amplifiers are usually rated in terms of peak power (PEP). For a given peak power, clipping increases SNR over the channel by 3-4dB.
-
-Clipping works by introducing controlled distortion, which affects the SNR estimator in the modem.  When clipping is enabled, the SNR reported will start to roll off. If clipping is disabled, the modem will report a more accurate SNR.
-
-This command line demonstrates the effect:
-```
-./src/freedv_data_raw_tx datac3 /dev/zero - --testframes 10 --bursts 10 --clip 1 | ./src/ch - - --No -100 --fading_dir unittest | ./src/freedv_data_raw_rx datac3 - /dev/null --testframes --framesperburst 1 -v
-```
-Try adjusting `--clip` and `No` argument of `ch` (noise level) for different modes.  Note the SNR estimates returned from `freedv_data_raw_rx` compared to the SNR from the channel simulator `ch`. You will notice clipping also increases the RMS power and reduces the PER for a given channel noise power.  CPAPR will also reduce with clipping enabled.
-
-The following plots illustrate the SNR estimates versus actual channel SNR with and without compression (clipping).  Note that even with the uncompressed waveform there is a small offset of around 1dB, possibly due to modem implementation loss or noise in the frequency, phase, or timing estimators.
-
-![](doc/snrest_snr_ctx.png)
-![](doc/snrest_snr_ctxc.png)
-
-## Reading Further
-
-1. See the raw data example in Quickstart section above.
-1. For simple examples of how use the FreeDV API, see the demo programs [freedv_datac1_tx.c](demo/freedv_datac1_tx.c) and [freedv_datac1_rx.c](demo/freedv_datac1_rx.c) 
-1. [freedv_data_raw_tx.c](src/freedv_data_raw_tx.c) and [freedv_data_raw_rx.c](src/freedv_data_raw_rx.c) are more full deatured example programs.  
-1. The modem waveforms designs are described in this [spreadsheet](doc/modem_codec_frame_design.ods).
-1. Examples in the [ctests](CMakeLists.txt) (look for "FreeDV API raw data")
-1. [Codec 2 HF Data Modes Part 1 blog post](http://www.rowetel.com/?p=7167)
-1. [HF Data Acquisition](https://github.com/drowe67/codec2/pull/171) GitHub Pull Request
-1. [datac4 & datac13](https://github.com/drowe67/codec2/pull/364) GitHub Pull Request
-1. [FreeDATA](https://freedata.app/) uses these modems
-
-# VHF Packet Data Channel
-
-The FreeDV VHF data channel operates on a packet level. The FreeDV modems however typically operate on a fixed frame base. This means that data packets have to be sent in multiple frames.
-
-The packet format is modeled after Ethernet. As a result, any protocol that is compatible with Ethernet can potentially be used over a FreeDV data link. (There are of course practical limits. Browsing the world wide web with just a few hundred bits per second will not be a pleasant experience.)
-
-## Header optimization
-
-When there are no packets available for transmission a small 'filler' packet with just the sender's address will be sent.
-When there is a packet available not all of the header needs to be sent. The sender's address can often be left out if it was already sent in a previous frame. Likewise when the packet has no specific destination but is targeted at a multicast address, this can also be transmitted in a single bit as opposed to a 6 byte broadcast address.
-
-
-## Addressing
-
-Since the format is based on Ethernet, a 6 byte sender and destination address is used. It is possible to encode an ITU compatible callsign in these bytes. See http://dmlinking.net/eth_ar.html for more info. Or have a look at freedv_data_tx.c and freedv_data_rx.c for an actual implementation.
-
-## Packet types
-
-The 2 byte EtherType field is used to distinguish between various protocols.
-
-## Checks
-
-Not all channels are perfect, and especially since a packet is split up over multiple frames, bits might get lost. Each packet therefore has a CRC which is checked before it is accepted.  Note there is No FEC on 2400A/2400B/800XA.
-
-## Available modes
-
-The data channel is available for modes 2400A, 2400B and 800XA.
-
-## API
-
-The data channel is part of the regular FreeDV API.
-
-### Initialization
-
-After creating a new freedv instance with freedv_open(), a few more calls need to be done before the data channel is usable.
-
-  ```
-   void freedv_set_data_header             (struct freedv *freedv, unsigned char *header);
-  ```
-
-The address that will be used for 'filler' packets must be set. The freedv_set_data_header() function must be called with a 6 byte header.
-
-  ```
-   typedef void (*freedv_callback_datarx)(void *, unsigned char *packet, size_t size);
-   typedef void (*freedv_callback_datatx)(void *, unsigned char *packet, size_t *size);
-   void freedv_set_callback_data           (struct freedv *freedv, freedv_callback_datarx datarx, freedv_callback_datatx datatx, void *callback_state);
-  ```
-
-Using freedv_set_callback_data() two callback functions can be provided. The datarx callback will be used whenever a new data packet has been successfully received. The datatx callback will be used when a new data packet is required for transmission.
-
-### Operation
-
-  ```
-   void freedv_datatx  (struct freedv *f, short mod_out[]);
-  ```
-
-During normal operation the freedv_datatx() function can be used whenever a data frame has to be sent. If no data is available it will request new data using the datatx callback. The callback function is allowed to set 'size' to zero if no data is available or if it wishes to send an address frame.
-
-For reception the regular freedv_rx() functions can be used as received data will automatically be reported using the datarx callback. Be aware that these functions return the actual number of received speech samples. When a data frame is received the return value will be zero. This may lead to 'gaps' in the audio stream which will have to be filled with silence.
-
-### Examples
-
-The freedv_data_tx and freedv_data_rx test programs implement the minimum needed to send and receive data packets.
-
-## Mixing voice and data
-
-Encoding only voice data is easy with the FreeDV API. Simply use the freedv_tx() function and provide it with speech samples.
-Likewise encoding only data is also easy. Make sure to provide a source of data frames using the freedv_set_callback_data() function, and use the freedv_datatx() function to generate frames.
-
-However there are many use cases where one would like to transmit a mix of voice and data. For example one might want to transmit their callsign in a machine readable format, or a short position report. There are a few ways to do this:
-
-### Data bursts at start and/or end of transmission
-
-This method simply transmits voice frames during the transmission, except for a few moments. For example when the user keys the radio the software uses the freedv_datatx() function for a number of frames before switching to regular voice frames.
-Likewise when the user releases the key the software may hold it for a number of frames to transmit data before it releases the actual radio.
-
-Be careful though: depending on your setup (radio, PC, soundcard, etc) the generated frames and the keying of your radio might not be perfectly in sync and the first or last frames might be lost in the actual transmission. Make sure to take this into account when using this method.
-
-### Data and voice interleaved
-
-Another method is to generate a mixed stream of frames. Compared to a small burst at the beginning or end a lot more data can be sent. We only need a way to choose between voice or data such that the recovered speech at the other side is not impacted.
-
-#### Detect voice activity
-
-When it is possible to determine activity in the voice signal (and it almost always is) this presence can be used to insert a data frame by calling freedv_datatx() instead of freedv_tx()/freedv_codectx(). This method is used in the freedv_mixed_tx demo program. When the option --codectx is given the codec2 library is used to determine the activity.
-
-  ```
-   $ ./src/freedv_mixed_tx 2400A ../raw/hts1a.raw - --codectx | src/freedv_data_rx 2400A -
-   $ ./src/freedv_mixed_tx 2400A ../raw/hts1a.raw - | src/freedv_data_rx 2400A -
-  ```
-
-The advantage of this method is that the audio is not distorted, there was nothing (or near nothing) to distort. A drawback is that constant voice activity may mean there are insufficient frames for data.
-
-### Receiving mixed voice and data
-
-Receiving and decoding a mixed voice and data stream is (almost) as easy as receiving a regular voice-only transmission.
-One simply uses the regular API calls for reception of speech samples. In addition, the callback functions are used for data.
-There is one caveat though: when a data frame is received the API functions (like freedv_rx) will return zero as this is the amount of codec/voice data received.
-For proper playback silence (or comfort noise) should be inserted for the duration of a frame to restore the timing of the original source speech samples.
-An example of how this is done is provided in freedv_mixed_rx
-
-  ```
-   $ ./src/freedv_mixed_tx 2400A ../raw/hts1a.raw - | src/freedv_mixed_rx 2400A - ./hts1a_out.raw
-  ```
-
-### Insert a data frame periodically
-
-This is a very simple method, simply insert a data frame every n frames, (e.g. once every 10 seconds). Since single FreeDV frames are relatively short (tens of milliseconds) the effect on received audio will be minor. The advantage of this method is that one can create a guaranteed amount of data bandwidth. A drawback is some interruption in the audio that may be noticed.
-
-### Combination of the above.
-
-A combination of the two methods may also be used. Send data when no voice is active and insert a frame when this does not occur for a long time.
-

third_party/codec2/README_fdmdv.md

@@ -1,106 +0,0 @@
-# README_fdmdv
-
-## Introduction
-
-A 1400 bit/s (nominal) Frequency Division Multiplexed Digital Voice (FDMDV) modem based on [FreeDV 1600 Specification](https://freedv.org/freedv-specification).  Used for FreeDV 1600.
-
-The FDMDV modem was first implemented in GNU Octave, then ported to C. Algorithm development is generally easier in Octave, but for real-time work we need the C version.  Automated units tests ensure the operation of the Octave and C versions are identical.
-
-## Quickstart
-
-Built as part of codec2, see [README](README.md) for build instructions.
-
-1. Generate some test bits and modulate them:
-    ```
-    $ cd codec2/build_linux/src
-    $ ./fdmdv_get_test_bits test.c2 1400
-    $ ./fdmdv_mod test.c2 test.raw
-    $ play -t .s16 -r 8000 test.raw
-    ```
-    
-1. Two seconds of test frame data modulated and sent out of sound device:
-    ```
-    $ ./fdmdv_get_test_bits - 2800 | ./fdmdv_mod - - | play -t .s16 -r 8000 -
-    ```
-    
-1. Send 14000 modulated bits (10 seconds) to the demod and count errors:
-    ```
-    $  ./fdmdv_get_test_bits - 14000 | ./fdmdv_mod - - | ./fdmdv_demod - - 14 demod_dump.txt | ./fdmdv_put_test_bits -
-    bits 13664  errors 0  BER 0.0000
-    ```
-    Use Octave to look at plots of 1 second (1400 bits) of modem operation:
-    ```
-    $ cd codec2/octave
-    $ octave-cli
-    octave:1> fdmdv_demod_c("../build_linux/src/demod_dump.txt",14000)
-    ```
-    
-1. Test with timing slips due to sample clock offset of 1000ppm:
-    ```
-    $ ./fdmdv_get_test_bits - 30000 | ./fdmdv_mod - - | sox -t raw -t .s16 -r 8000 - -t .s16 -r 7990 - | ./fdmdv_demod - - 14 demod_dump.txt | ./fdmdv_put_test_bits -
-    octave:98> fdmdv_demod_c("../build_linux/src/demod_dump.txt",28000)
-    27552 bits  0 errors  BER: 0.0000
-    ```
-
-1. Run Octave simulation of entire modem and AWGN channel:
-    ```
-    $ cd codec2/octave
-    $ octave-cli
-    octave:1> fdmdv_ut
-    ```
-    
-    
-## References
-
-1. [FreeDV 1600 Specification](https://freedv.org/freedv-specification)
-1. [Testing a FDMDV Modem](http://www.rowetel.com/blog/?p=2433)
-
-## C Code
-
-| File | Description |
-| --- | --- |
-| src/fdmdv_mod.c | C version of modulator that takes a file of bits and converts it to a raw file of modulated samples |
-| src/fdmdv_demod.c | C version of demodulator that takes a raw file of modulated samples and outputs a file of bits. Optionally dumps demod states to a text file which can be plotted using the Octave script fdmdv_demod_c.m |
-| src/codec2_fdmdv.h | Header file that exposes FDMDV C API functions |
-| src/fdmdv.c | C functions that implement the FDMDV modem |
-| src/fdmdv-internal.h | Internal states and constants for FDMDV modem, shouldn't be exposed to application program |
-| unittest/tfdmdv.c | Used to conjunction with unittest/tfdmdv.m to automatically test C FDMDV functions against Octave versions |
-
-## Octave Scripts
-
-Note these require some Octave packages to be installed, see [README](README.md)
-
-| File | Description |
-| --- | --- |
-| fdmdv.m | Functions and variables that implement the Octave version of the FDMDV modem |
-| fdmdv_ut.m | Unit test for fdmdv Octave code, useful while developing algorithm.  Includes tx/rx plus basic channel simulation |
-| fdmdv_mod.m | Octave version of modulator that outputs a raw file. The modulator is driven by a test frame of bits.  This can then be played over a real channel or through a channel simulator like PathSim.  The sample rate can be changed using "sox" to simulate differences in tx/rx sample clocks |
-| fdmdv_demod.m | Demodulator program that takes a raw file as input, and works out the bit error rate using known test frames.  Can be used to test the demod performance with off-air signals, or signals that have been passed through a channel simulator |
-| fdmdv_demod_c.m | Takes an output text file from the C demod fdmdv_demod.c and produces plots and measures BER. Useful for evaluating fdmdv_demod.c performance. The plots produced are identical to the Octave version fdmdv_demod.m, allowing direct comparison of the C and Octave versions |
-| tfdmdv.m | Automatic tests that compare the Octave and C versions of the FDMDV modem functions.  First run unittest/tfdmdv, this will generate a text file with test vectors from the C version.  Then run the Octave script tfdmdv and it will generate Octave versions of the test vectors and compare each vector with the C equivalent.  It plots the vectors and errors (green).  It also produces an automatic checklist based on test results.  If the Octave or C modem code is changed, this script should be used to ensure the C and Octave versions remain identical. This process has been wrapped up in the `ctest -R test_FDMDV_modem_octave_port`. |
-
-1. Typical fdmdv_ut run:
-    ```
-    octave:6> fdmdv_ut
-    Eb/No (meas): 7.30 (8.29) dB
-    bits........: 2464
-    errors......: 20
-    BER.........: 0.0081
-    PAPR........: 13.54 dB
-    SNR.........: 4.0 dB
-    ```
-    It also outputs lots of nice plots that show the operation of the modem.
-
-    For a 1400 bit/s DQPSK modem we expect about 1% BER for Eb/No = 7.3dB, which corresponds to SNR = 4dB (3kHz noise BW). The extra dB of measured power is due to the DBPSK pilot. Currently the noise generation code doesn't take the pilot power into account, so in this example the real SNR is actually 5dB.
-
-1. To generate 10 seconds of modulated signal:
-    ```
-    octave:8> fdmdv_mod("test.raw",1400*10);
-    ```
-    To demodulate 2 seconds of the test.raw file generated above:
-    ```
-    octave:9> fdmdv_demod("test.raw",1400*2);
-    2464 bits  0 errors  BER: 0.0000
-    ```
-    It also produces several plots showing the internal states of the demod.  Useful for debugging and observing what happens with various channels.
-

third_party/codec2/README_freedv.md

@@ -1,217 +0,0 @@
-# FreeDV Technology
-
-FreeDV is an open source digital voice protocol that integrates modems, speech codecs, and FEC.
-
-On transmit, FreeDV converts speech to a modem signal you can send over a radio channel.  On receive, FreeDV takes off air modem signals and converts them to speech samples.
-
-FreeDV is available as a GUI application, an open source library (FreeDV API), and in hardware (the SM1000 FreeDV adaptor).  FreeDV is part of the Codec 2 project.
-
-This document gives an overview of the technology inside FreeDV, and some additional notes on building/using the FreeDV 2020 and 2400A/2400B modes.
-
-![FreeDV mode knob](http://www.rowetel.com/images/codec2/mode_dv.jpg)
-
-## FreeDV API
-
-The general programming model is:
-  ```
-  speech samples -> FreeDV encode -> modulated samples (send over radio) -> FreeDV decode -> speech samples
-  ```
-
-The `codec2/demo` directory provides simple FreeDV API demo programs written in C and Python to help you get started, for example:
-
-```
-cd codec2/build_linux
-cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ./demo/freedv_700d_rx | aplay -f S16_LE
-```
-
-The current demo programs are as follows:
-
-| Program | Description |
-| --- | --- |
-| [c2demo.c](demo/c2demo.c) | Encode and decode speech with Codec 2 |
-| [freedv_700d_tx.c](demo/freedv_700d_tx.c) | Transmit a voice signal using the FreeDV API |
-| [freedv_700d_rx.c](demo/freedv_700d_rx.c) | Receive a voice signal using the FreeDV API |
-| [freedv_700d_rx.py](demo/freedv_700d_rx.py) | Receive a voice signal using the FreeDV API in Python |
-| [freedv_datac1_tx.c](demo/freedv_datac1_tx.c) | Transmit raw data frames using the FreeDV API |
-| [freedv_datac1_rx.c](demo/freedv_datac1_rx.c) | Receive raw data frames using the FreeDV API |
-| [freedv_datac0c1_tx.c](demo/freedv_datac0c1_tx.c) | Transmit two types of raw data frames using the FreeDV API |
-| [freedv_datac0c1_rx.c](demo/freedv_datac0c1_rx.c) | Receive two types of raw data frames using the FreeDV API |
-
-So also [freedv_api.h](src/freedv_api.h) and [freedv_api.c](src/freedv_api.c) for the full list of API functions.  Only a small set of these functions are needed for basic FreeDV use, please see the demo programs for minimal examples.
-
-The full featured command line demo programs [freedv_tx.c](src/freedv_tx.c) & [freedv_rx.c](src/freedv_rx.c) demonstrate many features of the API:
-
-```
-$ ./freedv_tx 1600 ../../raw/hts1.raw - | ./freedv_rx 1600 - - | aplay -f S16_LE
-$ cat freedv_rx_log.txt
-```
-
-Speech samples are input to the API as 16 bit signed integers.  Modulated samples can be in real 16 bit signed integer or complex float. The expected sample rates can be found with `freedv_get_speech_sample_rate()` and `freedv_get_modem_sample_rate()`. These are typically 8000 Hz but can vary depending on the current FreeDV mode.
-
-## FreeDV HF Modes
-
-These are designed for use with a HF SSB radio.
-
-| Mode | Date | Codec | Modem | RF BW | Raw bits/s | FEC | Text bits/s | SNR min | Multipath |
-| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
-| 1600  | 2012 | Codec2 1300 | 14 DQPSK + 1 DBPSK pilot carrier | 1125 | 1600 | Golay (23,12) | 25 | 4 | poor |
-| 700C  | 2017 | Codec2 700C | 14 carrier coherent QPSK + diversity | 1500 | 1400 | - | - | 2 | good |
-| 700D  | 2018 | Codec2 700C | 17 carrier coherent OFDM/QPSK | 1000 | 1900 | LDPC (224,112)  | 25 | -2 | fair |
-| 700E  | 2020 | Codec2 700C | 21 carrier coherent OFDM/QPSK | 1500 | 3000 | LDPC (112,56)  | 25 | 1 | good |
-| 2020  | 2019 | LPCNet 1733 | 31 carrier coherent OFDM/QPSK | 1600 | 3000 | LDPC (504,396)  | 22 | 2 | poor |
-| 2020B | 2022 | LPCNet 1733 | 29 carrier coherent OFDM/QPSK | 2100 | 4100 | LDPC (112,56) unequal  | 22.2 | 3 | good |
-| 2020C | 2022 | LPCNet 1733 | 29 carrier coherent OFDM/QPSK | 2100 | 4100 | LDPC (212,158) | 22.2 | 5 | good |
-
-Notes:
-
-1. *Raw bits/s* is the number of payload bits/s carried over the channel by the modem.  This consists of codec frames, FEC parity bits, unprotected text, and synchronisation information such as pilot and unique word bits.  The estimates are open to interpretation for the OFDM waveforms due to pilot symbol and cyclic prefix considerations (see spreadsheet).
-
-1. *RF BW* is the bandwidth of the RF signal over the air.  FreeDV is more bandwidth efficient than SSB.
-
-1. *Multipath* is the relative resilience of the mode to multipath fading, the biggest problem digital voice faces on HF radio channels.  Analog SSB would be rated as "good".
-
-1. *Text* is a side channel for low bit rate text such as your location and call sign.  It is generally unprotected by FEC, and encoded with varicode. The exception is if reliable_text support is turned on (see reliable_text.c/h); this results in text protected by LDPC(112,56) FEC with interleaving.
-
-1. *SNR Min* is for an AWGN channel (no multipath/fading).
-
-1. All of the modems use multiple parallel carriers running at a low symbol rate of around 50 Hz.  This helps combat the effects of multipath channels.
-
-1. Some of the Codec 2 modes (2400/1300/700C etc) happen to match the name of a FreeDV mode.  For example FreeDV 700C uses Codec 2 700C for voice compression. However FreeDV 700D *also* uses Codec 2 700C for voice compression, but has a very different modem waveform to FreeDV 700C.  Sorry for the confusing nomenclature.
-
-1. Coherent demodulation gives much better performance than differential, at the cost of some additional complexity.  Pilot symbols are transmitted regularly to allow the demod to estimate the reference phase of each carrier.
-
-1. The 1600 and 700C waveforms use parallel tone modems, later modes use OFDM.  OFDM gives tighter carrier packing which allows higher bit rates, but tends to suffer more from frequency offsets and delay spread.
-
-1. At medium to high SNRs, FreeDV 700C performs well (better than 700D) on fast fading multipath channels with large delay spread due its parallel tone design and high pilot symbol rate.  It employs transmit diversity which delivers BER performance similar to modes using FEC.  FreeDV 700C also has a short frame (40ms), so syncs fast with low latency.  Fast sync is useful on marginal channels that move between unusable and barely usable.
-
-1. FreeDV 700D uses an OFDM modem and was optimised for low SNR channels, with strong FEC but a low pilot symbol rate and modest (2ms) cyclic prefix which means its performance degrades on multipath channels with fast (> 1Hz) fading.  The use of strong FEC makes this mode quite robust to other channel impairments, such as static crashes, urban HF noise, and in-band interference.
-
-1. FEC was added fairly recently to FreeDV modes.  The voice codecs we use work OK at bit error rates of a few %, and packet error rates of 10%. Raw bit error rates on multipath channels often exceed 10%.  For reasonable latency (say 40ms) we need small codewords. Thus to be useful we require a FEC code that works at over 10% raw BER, has 1% output (coded) bit error rate, and a codeword of around 100 bits.  Digital voice has unusual requirements, most FEC codes are designed for data which is intolerant of any bit errors, and few operate over 10% raw BER.  Powerful FEC codes have long block lengths (1000's of bits) which leads to long latency.  However LDPC codes come close, and can also "clean up" other channel errors caused by static and interference.  The use of OFDM means we now have "room" for the extra bits required for FEC, so there is little cost in adding it, apart from latency.
-
-1. 2020B uses unequal error protection, only 11 bits from each 52 bit vocoder frame are protected by FEC.  This provides strong protection of the most important bits.  The effect is a gentle "slope" in the speech quality versus SNR curve, but with some audible errors even at high SNRs.  2020C has a LDPC code that protects all bits - it will have no audible errors at high SNRs, but will fall over at about 5dB SNR. 2020B and 2020C have a modem waveform similar to 700E - a high pilot symbol rate to  operate on fast fading channels.  Compared to 2020, B&C have a shorter frame duration (90ms), lower latency and faster sync, but require a few more dB SNR.
-
-## FreeDV VHF Modes
-
-These modes use constant amplitude modulation like FSK or FM, and are designed for VHF and above.  However 800XA can be run over HF or VHF on a SSB radio.
-
-| Mode | Date | Codec2 | Modem | RF BW | Raw bits/s | FEC | Text bits/s |
-| --- | --- | --- | --- | --- | --- | --- | --- |
-| 2400A | 2016 | 1300 | 4FSK | 5kHz | 2400 | Golay (23,12) | 50 |
-| 2400B | 2016 | 1300 | baseband/analog FM | analog FM | 2400 | Golay (23,12) | 50 |
-| 800XA | 2017 | 700C |  4FSK | 2000 | 800 | - | N |
-| FSK_LDPC | 2020 | - | 2 or 4 FSK |  user defined | user defined | LDPC | - | - |
-
-The FSK_LDPC mode is used for data, and has user defined bit rate and a variety of LDPC codes available.  It is discussed in [README_data](README_data.md)
-
-## FreeDV 2400A and 2400B modes
-
-FreeDV 2400A and FreeDV 2400B are modes designed for VHF radio. FreeDV 2400A is designed for SDR radios (it has a 5 kHz RF bandwidth), however FreeDV 2400B is designed to pass through commodity FM radios.
-
-Demos of FreeDV 2400A and 2400B:
-```
-$ ./freedv_tx 2400A ../../raw/ve9qrp_10s.raw - | ./freedv_rx 2400A - - | play -t .s16 -r 8000 -
-$ ./freedv_tx 2400B ../../raw/ve9qrp_10s.raw - | ./freedv_rx 2400B - - | play -t .s16 -r 8000 -
-```
-Note for FreeDV 2400A/2400B the modem signal sample rate is 48kHz.  To
-listen to the modem tones from FreeDV 2400B, or play them into a FM HT
-mic input:
-```
-$ ./freedv_tx 2400B ../../raw/ve9qrp_10s.raw - | play -t .s16 -r 48000 -
-```
-Simulate FreeDV 2400B passing through a 300 to 3000 Hz audio path using sox to filter:
-```
-$  ./freedv_tx 2400B ../../raw/ve9qrp_10s.raw - | sox -t .s16 -r 48000 - -t .s16 - sinc 300-3000 | ./freedv_rx 2400B - - | play -t .s16 -r 8000 -
-```
-
-## FreeDV 2020 support (building with LPCNet)
-
-1. Build LPCNet:
-   ```
-   $ cd ~
-   $ git clone https://github.com/drowe67/LPCNet
-   $ cd LPCNet && mkdir build_linux && cd build_linux
-   $ cmake ..
-   $ make
-   ```
-
-1. Build Codec 2 with LPCNet support:
-   ```
-   $ cd ~/codec2/build_linux && rm -Rf *
-   $ cmake -DLPCNET_BUILD_DIR=~/LPCNet/build_linux ..
-   $ make
-   ```
-
-## FreeDV 2020 tests with FreeDV API
-
-```
-$ cat ~/LPCNet/wav/wia.wav | ~/LPCNet/build_linux/src/lpcnet_enc -s | ./ofdm_mod --mode 2020 --ldpc --verbose 1 | ./ofdm_demod --mode 2020 --verbose 1 --ldpc | ~/LPCNet/build_linux/src/lpcnet_dec -s | aplay -f S16_LE -r 16000
-```
-Listen the reference tx:
-```
-$ cat ~/LPCNet/wav/wia.wav | ~/LPCNet/build_linux/src/lpcnet_enc -s | ./ofdm_mod --mode 2020 --ldpc --verbose 1 | aplay -f S16_LE
-```
-
-Listen the freedv_tx:
-```
-$ ./freedv_tx 2020 ~/LPCNet/wav/wia.wav - | aplay -f S16_LE
-```
-
-FreeDV API tx, with reference rx from above:
-```
-$ ./freedv_tx 2020 ~/LPCNet/wav/wia.wav - | ./ofdm_demod --mode 2020 --verbose 1 --ldpc | ~/LPCNet/build_linux/src/lpcnet_dec -s | aplay -f S16_LE -r 16000
-```
-
-FreeDV API tx and rx:
-```
-$ ./freedv_tx 2020 ~/LPCNet/wav/all.wav - | ./freedv_rx 2020 - - | aplay -f S16_LE -r 16000
-$ ./freedv_tx 2020 ~/LPCNet/wav/all.wav - --testframes | ./freedv_rx 2020 - /dev/null --testframes -vv
-```
-
-Simulated HF slow fading channel, 10.8dB SNR:
-```
-$ ./freedv_tx 2020 ~/LPCNet/wav/all.wav - | ./ch - - --No -30 --slow | ./freedv_rx 2020 - - | aplay -f S16_LE -r 16000
-```
-It falls down quite a bit with fast fading (--fast):
-
-AWGN (noise but no fading) channel, 2.8dB SNR:
-```
-$ ./freedv_tx 2020 ~/LPCNet/wav/all.wav - | ./ch - - --No -22 | ./freedv_rx 2020 - - | aplay -f S16_LE -r 16000
-```
-
-## Command lines for PER testing 700D/700E PER with clipper
-
-AWGN:
-```
-$ ./src/freedv_tx 700D ../raw/ve9qrp.raw - --clip 0 --testframes | ./src/ch - - --No -16 | ./src/freedv_rx 700D - /dev/null --testframes
-```
-MultiPath Poor (MPP):
-```
-$ ./src/freedv_tx 700D ../raw/ve9qrp.raw - --clip 0 --testframes | ./src/ch - - --No -24 --mpp --fading_dir unittest | ./src/freedv_rx 700D - /dev/null --testframes
-```
-
-Adjust `--clip [0|1]` and `No` argument of `ch` to obtain a PER of just less than 0.1, and note the SNR and PAPR reported by `ch`.  The use of the `ve9qrp` samples makes the test run for a few minutes, in order to get reasonable multipath channel results.
-
-Low SNR MPP channel 2020B command line:
-```
-cat ~/LPCNet/wav/all.wav | ~/LPCNet/build_linux/src/lpcnet_enc -x | ./src/ofdm_mod --mode 2020B --ldpc --clip --txbpf | ./src/ch - - --No -22 --mpd | ./src/ofdm_demod --mode 2020B --verbose 1 --ldpc | ~/LPCNet/build_linux/src/lpcnet_dec -x | aplay -f S16_LE -r 16000
-```
-
-## Reading Further
-
-1. [FreeDV web site](http://freedv.org)
-1. [FreeDV GUI User Manual](https://github.com/drowe67/freedv-gui/blob/master/USER_MANUAL.md)
-1. [Codec 2](http://rowetel.com/codec2.html)
-1. FreeDV can also be used for data [README_data](https://github.com/drowe67/codec2/blob/master/README_data.md)
-1. [FreeDV 1600 specification](https://freedv.org/freedv-specification)
-1. [FreeDV 700C blog post](http://www.rowetel.com/wordpress/?p=5456)
-1. [FreeDV 700D Released blog post](http://www.rowetel.com/wordpress/?p=6103)
-1. [FreeDV 2020 blog post](http://www.rowetel.com/wordpress/?p=6747)
-1. [FreeDV 2400A blog post](http://www.rowetel.com/?p=5119)
-1. [FreeDV 2400A & 2400B](http://www.rowetel.com/?p=5219)
-1. Technical information on various modem waveforms in the [modem codec frame design spreadsheet](https://github.com/drowe67/codec2/blob/master/doc/modem_codec_frame_design.ods)
-1. [Modems for HF Digital Voice Part 1](http://www.rowetel.com/wordpress/?p=5420)
-1. [Modems for HF Digital Voice Part 2](http://www.rowetel.com/wordpress/?p=5448)
-1. [FDMDV modem README](README_fdmdv.md)
-1. [OFDM modem README](README_ofdm.md)
-1. Many blog posts in the [rowetel.com blog archives](http://www.rowetel.com/?page_id=6172)
-

third_party/codec2/README_fsk.md

@@ -1,175 +0,0 @@
-# README_fsk
-
-A FSK modem with a non-coherent demodulator.  Performance is within a fraction of a dB of ideal.  The demodulator automagically estimates the tone frequencies and tracks frequency drift.
-
-Here is a typical Bit Error Rate (BER) versus Eb/No curve:
-
-![BER versus Eb/No curve](doc/fsk_modem_ber_8000_100.png)
-
-Note how close the theory line is to measured performance.
-
-This modem can demodulate FSK signals that sound like [this sample](doc/lockdown_3s.wav); and is used to receive images from the [edge of space](https://github.com/projecthorus/wenet):
-
-![HAB image from edge of space](doc/wenet_image.jpg)
-
-## Credits
-
-The Octave version of the modem was developed by David Rowe.  Brady O'Brien ported the modem to C, and wrote the C/Octave tests.  The modem is being maintained by David Rowe.  Mark Jessop has helped improve the modem operation by testing against various balloon telemtry waveforms.  Bill Cowley has developed the Log Likelihood Ratio (LLR) algorithms for 4FSK.
-
-## Quickstart
-
-1. Build codec2:
-   ```
-   $ cd codec2 && mkdir build_linux && cmake .. && make
-   ```
-
-1. Generate 1000 test bits, modulate them using 2FSK using a 8000 Hz sample rate, 100 bits/s, play on your sound card:
-   ```    
-   $ cd ~/codec2/build_linux/src
-   $ ./fsk_get_test_bits - 1000 | ./fsk_mod 2 8000 100 1200 1200 - - | aplay -f S16_LE
-   ```
-    The low tone frequency is 1200Hz, and the upper tone 1200 + 1200 = 2400Hz.
-
-1. Add the demodulator and measure the bit error rate over 10,000 bits of 100 bit/s 2FSK:
-   ```
-   $ ./fsk_get_test_bits - 10000 | ./fsk_mod 2 8000 100 1200 100 - - | ./fsk_demod 2 8000 100 - - | ./fsk_put_test_bits -
-   <snip>
-   [0099] BER 0.000, bits tested   9900, bit errors    0
-   PASS
-   ```
-   We get a Bit Error Rate (BER) of 0, as there is no channel noise to induce bit errors.
-   
-1. Same thing but this time with 4FSK, and less verbose output:
-   ```
-   $ ./fsk_get_test_bits - 10000 | ./fsk_mod 4 8000 100 1200 100 - - | ./fsk_demod 4 8000 100 - - | ./fsk_put_test_bits -q -
-   <snip>
-   [0099] BER 0.000, bits tested   9900, bit errors    0
-   PASS
-   ```
-
-1. Lets add some channel noise:
-   ```
-   $ ./fsk_get_test_bits - 10000 | ./fsk_mod 2 8000 100 1200 100 - - | ./ch - - --No -26 | ./fsk_demod 2 8000 100 - - | ./fsk_put_test_bits -b 0.015 -
-   <snip>
-   SNR3k(dB): -5.76 C/No: 29.0 PAPR:  3.0 
-   [0099] BER 0.010, bits tested   9900, bit errors  103
-   PASS
-   ```
-   The `ch` utility takes the FSK modulator signal, and adds calibrated noise to it (the `--No -26` value specifies the noise).  Try changing the noise level, and note how the Bit Error Rate (BER) changes.  The BER is 0.01, which is right on theory for this sort of FSK demodulator at this SNR (2FSK non-coherent demodulator Eb/No=9dB).  
-
-   The SNR is calculated using the signal power divided by the noise power in 3000 Hz.  The C/No value is the same thing, but uses a noise bandwidth of 1 Hz.  There is less noise power when you look at just 1Hz, so C/No is higher. Peak to Average Power ratio (PAPR) is 3dB as a FSK signal is just a single sine wave, and a sine wave peak is 3dB higher than it's average.
-
-1. You can visualise the C modem operation with a companion python script, for example:
-   ```
-   $ ./fsk_get_test_bits - 10000 | ./fsk_mod -p 10 4 8000 400 400 400 - - | ./fsk_demod -p 10 -t1 4 8000 400 - /dev/null 2>stats.txt
-   $ python ../../octave/plot_fsk_demod_stats.py stats.txt
-   ```
-
-1. Send some digital voice using FSK at 800 bits/s, and try the two 2400 bits/s FSK modes:
-   ```
-   $ ./freedv_tx 800XA ../../raw/ve9qrp.raw - | ./freedv_rx 800XA - - -vv | aplay -f S16_LE
-   $ ./freedv_tx 2400A ../../raw/ve9qrp.raw - | ./freedv_rx 2400A - - -vv | aplay -f S16_LE
-   $ ./freedv_tx 2400B ../../raw/ve9qrp.raw - | ./freedv_rx 2400B - - -vv | aplay -f S16_LE
-   ```
-
-1. LDPC encoded 4FSK, with framing:
-   ```
-   $ cd ~/codec2/build_linux/src
-   $ ./ldpc_enc /dev/zero - --code H_256_512_4 --testframes 200 |
-     ./framer - - 512 5186 | ./fsk_mod 4 8000 100 1000 100 - - |
-     ./ch - - --No -24 |
-     ./fsk_demod -s 4 8000 100 - - |
-     ./deframer - - 512 5186  |
-     ./ldpc_dec - /dev/null --code H_256_512_4 --testframes
-   <snip>
-   SNR3k(dB): -7.74 C/No: 27.0 PAPR:  3.0 
-   Raw   Tbits: 100352 Terr:   6701 BER: 0.067
-   Coded Tbits:  50176 Terr:    139 BER: 0.003
-         Tpkts:    196 Tper:      4 PER: 0.020
-   ```
-   In this example the unique word is the 16 bit sequence `5186`.  See also several ctests using these application. Other codes are also available:
-   ```
-   $ ./ldpc_enc --listcodes
-
-   H2064_516_sparse     rate 0.80 (2580,2064) 
-   HRA_112_112          rate 0.50 (224,112) 
-   HRAb_396_504         rate 0.79 (504,396) 
-   H_256_768            rate 0.33 (768,256) 
-   H_256_512_4          rate 0.50 (512,256) 
-   HRAa_1536_512        rate 0.75 (2048,1536) 
-   H_128_256_5          rate 0.50 (256,128)
-   ```
-   If you change the code you also need to change the `frameSizeBits` argument in `framer/deframer` (`512` in the example above).
-
-1. The FSK/LDPC/framer steps above have been combined in a FreeDV API mode.  See "FSK LDPC Raw Data Mode" in [README_data.md](README_data.md).
-
-1. FSK modem C files in ```codec2/src```:
-
-   | File | Description |
-   | ---  | --- |
-   | fsk.c/fsk.h | core FSK modem library |
-   | fsk_mod.c | command line modulator |
-   | fsk_demod.c | command line demodulator |
-   | fsk_get_test_bits.c | source of test bits |
-   | fsk_put_test_bits.c | test bit sync, counts bit errors and packet errors |
-   | fsk_mod_ext_vco.c | modulator that uses an external FSK oscillator |
-   | framer.c | adds a unique word to a frame of bits to implement frame sync for LDPC codewords |
-   | deframer.c | locates and strips a unique word to implement frame sync for LDPC codewords |
-   | tollr.c | converts bits to LLRs for testing LDPC framing |
-
-1. GNU Octave files in ```codec2/octave```:
-
-   | File | Description |
-   | ---  | --- |
-   | fsk_lib.m | Core FSK modem library |
-   | fsk_lib_demo.m | A demonstration of fsk_lib, runs a single point BER test |
-   | fsk_demod_file.m | Demodulates FSK signals from a file, useful for debugging FSK waveforms |
-   | tfsk.m | automated test that compares the C and Octave versions of the modem |
-   | fsk_lib_ldpc_demo.m | CML library LLR routines and LDPC codes with fsk_lib.m |
-   
-   You can run many of them from the Octave command line:
-   ```
-   $ octave --no-gui
-   octave:1> fsk_lib_demo
-   ```
-
-1. A suite of automated ctests that exercise the C and Octave code:
-   ```
-   $ cd ~/codec2/build_linux
-   $ ctest -R test_fsk
-   1/9 Test #39: test_fsk_lib ......................   Passed    3.37 sec
-   3/9 Test #41: test_fsk_modem_octave_port ........   Passed    4.17 sec
-   4/9 Test #42: test_fsk_modem_mod_demod ..........   Passed    0.06 sec
-   5/9 Test #43: test_fsk_2fsk_ber .................   Passed    0.24 sec
-   6/9 Test #44: test_fsk_4fsk_ber .................   Passed    0.12 sec
-   7/9 Test #45: test_fsk_4fsk_ber_negative_freq ...   Passed    0.07 sec
-   8/9 Test #46: test_fsk_4fsk_lockdown ............   Passed    2.84 sec
-   9/9 Test #47: test_fsk_vhf_framer ...............   Passed    0.06 sec
-   ```
-   These are written in ```codec2/CmakeLists.txt```, inspect them to find out how we test the modem.
-
-1. ```fsk_demod_file.m``` is useful for peering inside the modem, for example when debugging.
-   ```
-   $ cd ~/codec2/build_linux/src
-   $ ./fsk_get_test_bits - 1000 | ./fsk_mod 2 8000 100 1000 1000 - ../../octave/fsk.s16
-   $ octave --no-gui
-   octave:1> fsk_demod_file("fsk.s16",format="s16",8000,100,2)
-   ```
-   
-## Further Reading
-
-   Here are some links to projects and blog posts that use this modem:
-
-   1. [Horus Binary](https://github.com/projecthorus/horusbinary) High Altitude Balloon (HAB) telemetry protocol, 3 second updates, works at 7dB lower SNR that RTTY.
-   1. [Testing HAB Telemetry, Horus binary waveform](http://www.rowetel.com/?p=5906)
-   1. A really useful reference on a variety of modulation techniques from [Atlanta DSP](http://www.atlantarf.com/FSK_Modulation.php).  I keep this handy when experimenting with modems.
-   1. The [RTTY modem project](http://www.rowetel.com/?p=4629) that kicked off the FSK modem work.
-   1. [Wenet](https://github.com/projecthorus/wenet) - high speed SSTV images from balloons at the edge of space
-   1. [Wenet High speed SSTV images](http://www.rowetel.com/?p=5344)
-   1. [FreeDV 2400A and 2400B](http://www.rowetel.com/?p=5219), digital speech for VHF/UHF radios.
-   1. [HF FSK with Rpitx](http://www.rowetel.com/?p=6317), a zero hardware FSK transmitter using a Pi
-   1. [Eb/No and SNR worked Example](http://www.rowetel.com/wordpress/?p=4621)
-   1. [FSK LLR LDPC Code Experiments](https://github.com/drowe67/codec2/pull/129)
-   1. [FreeDV API FSK LDPC Raw Data Mode](README_data.md)
-
-

third_party/codec2/README_ofdm.md

@@ -1,252 +0,0 @@
-# README_ofdm
-
-An Orthogonal Frequency Division Multiplexed (OFDM) modem designed for digital voice over HF SSB.  Typical configuration for FreeDV 700D is 700 bit/s voice, a rate 0.5 LDPC code, and 1400 bit/s raw data rate over the channel.
-
-The OFDM modem was first implemented in GNU Octave, then ported to C. Algorithm development is generally easier in Octave, but for real time work we need the C version.  Automated units tests ensure the operation of the Octave and C versions are identical.
-
-## Credits
-
-Steve, David, Don, Richard
-
-## References
-
-1. Spreadsheet describing the [waveform design](doc/modem_codec_frame_design.ods)  The OFDM tab descrives the baseline 700D OFDM waveform.
-
-1. This modem can be used for sending [raw data frames](README_data.md) over HF channels.
-
-1. [Towards FreeDV 700D](https://www.rowetel.com/?p=5573)
-
-1. [FreeDV 700D - First Over The Air Tests](https://www.rowetel.com/?p=5630)
-
-1. [Steve Ports an OFDM modem from Octave to C](https://www.rowetel.com/?p=5824)
-
-1. [Modems for HF Digital Voice Part 1](http://www.rowetel.com/wordpress/?p=5420)
-
-1. [Modems for HF Digital Voice Part 2](http://www.rowetel.com/wordpress/?p=5448)
-
-# Examples
-
-Built as part of codec2-dev, see [README](README.md) for build instructions.
-
-1. Generate 10 seconds of test frame bits, modulate, and play audio
-   out of sound device (SoX v14.4.2):
-   ```
-   $  build_linux/src$ ./ofdm_mod --in /dev/zero --testframes 10 | play --type s16 --rate 8000 --channels 2 -
-   ```
-
-1. Generate 10 seconds of uncoded test frame bits, modulate, demodulate, count errors:
-   ```
-   $  build_linux/src$ ./ofdm_mod --in /dev/zero --testframes 10 | ./ofdm_demod --out /dev/null --testframes --verbose 1 --log demod_dump.txt
-   ```   
-   Use Octave to look at plots of C modem operation:
-   ```
-     $ cd ../../octave
-     $ octave --no-gui
-     octave:1> ofdm_demod_c("../build_linux/src/demod_dump.txt")
-   ```
-
-1. Run Octave versions of mod and demod (called tx and rx to avoid namespace clashes in Octave):
-   ```
-   $ cd ~/octave
-   $ octave --no-gui
-   octave:1> ofdm_tx("ofdm_test.raw","700D",10)
-   octave:1> ofdm_rx("ofdm_test.raw")
-   ```
-   The Octave modulator ofdm_tx can simulate channel impairments, for
-   example AWGN noise at 4dB SNR:
-   ```
-     octave:1> ofdm_tx("ofdm_test.raw", "700D", 10, 4)
-   ```
-   The Octave versions use the same test frames as C so can interoperate.
-   ```
-     build_linux/src$ ./ofdm_demod --in ../../octave/ofdm_test.raw --out /dev/null --testframes --verbose 1
-   ```
-
-1. Run mod/demod with LDPC FEC; 60 seconds, 3dB SNR:
-   ```
-     octave:6> ofdm_ldpc_tx('ofdm_test.raw',"700D",60,3)
-     octave:7> ofdm_ldpc_rx('ofdm_test.raw',"700D")
-   ```
-   C demodulator/LDPC decoder:
-   ```   
-   build_linux/src$ ./ofdm_demod --in ../../octave/ofdm_test.raw --out /dev/null --verbose 1 --testframes --ldpc
-   ```
-
-1. Pass Codec 2 700C compressed speech through OFDM modem:
-   ```
-   build_linux/src$ ./c2enc 700C ../../raw/ve9qrp_10s.raw - --bitperchar | ./ofdm_mod --ldpc | ./ofdm_demod --ldpc | ./c2dec 700C - - --bitperchar | play --type s16 --rate 8000 --channels 1 -
-   ```
-
-1. Listen to signal through simulated fading channel in C:
-   ```
-   build_linux/src$ ./c2enc 700C ../../raw/ve9qrp_10s.raw - --bitperchar | ./ofdm_mod --ldpc | ./ch - - --No -20 --mpg -f -5 | aplay -f S16
-   ```
-
-1. Run test frames through simulated channel in C:
-   ```
-   build_linux/src$ ./ofdm_mod --in /dev/zero --ldpc --testframes 20 | ./ch - - --No -24 -f -10 --mpp | ./ofdm_demod --out /dev/null --testframes --verbose 1 --ldpc
-   ```
-
-1. Run codec voice through simulated fast fading channel, just where it starts to fall over:
-   ```
-   build_linux/src$ ./c2enc 700C ../../raw/ve9qrp.raw - --bitperchar | ./ofdm_mod --ldpc | ./ch - - --No -24 -f -10 --mpp | ./ofdm_demod --ldpc --verbose 1 | ./c2dec 700C - - --bitperchar | aplay -f S16
-   ```
-
-1. FreeDV 1600 on the same channel conditions, roughly same quality at 8dB higher SNR:
-   ```
-   build_linux/src$ ./freedv_tx 1600 ../../raw/ve9qrp_10s.raw - | ./ch - - --No -30 -f -10 --mpp | ./freedv_rx 1600 - - | aplay -f S16
-   ```
-
-1. Using FreeDV API test programs:
-   ```
-   build_linux/src$ ./freedv_tx 700D ../../raw/hts1a.raw - --testframes | ./freedv_rx 700D - /dev/null --testframes
-   build_linux/src$ ./freedv_tx 700D ../../raw/hts1a.raw - | ./freedv_rx 700D - - | aplay -f S16
-   build_linux/src$ ./freedv_tx 700D ../../raw/ve9qrp.raw - | ./ch - - --No -26 -f -10 --mpp | ./freedv_rx 700D - - | aplay -f S16
-   ```
-
-## FreeDV 2020 extensions
-
-1.  20.5ms symbol period, 31 carrier waveform, (504,396) code, but only 312 data bits used, so we don't send unused data bits.  This means we need less carriers (so more power per carrier), and code rate is increased slightly:
-    ```
-    build_linux/src$ ./ofdm_mod --in /dev/zero --testframes 300 --mode 2020 --ldpc 1 --verbose 1 | ./ch - - --No -22 -f 10 --ssbfilt 1 | ./ofdm_demod --out /dev/null --testframes --mode 2020 --verbose 1 --ldpc
-
-    SNR3k(dB):  2.21 C/No: 37.0 PAPR:  9.6
-    BER......: 0.0505 Tbits: 874020 Terrs: 44148
-    Coded BER: 0.0096 Tbits: 649272 Terrs:  6230
-    ```
-
-## Acquisition tests
-
-1. Acquisition (getting sync) can be problematic in fading channels. Some special tests have been developed, that measure acquisition time on off air 700D samples at different time offsets:
-   ```
-   octave:61> ofdm_ldpc_rx("../wav/vk2tpm_004.wav", "700D", "", 5, 4)
-   build_linux/src$ ./ofdm_demod --in ../../wav/vk2tpm_004.wav --out /dev/null --verbose 2 --ldpc --start_secs 5 --len_secs 4
-   ```
-
-1. Different time offsets effectively tests the ability to sync on fading channel in different states.  Stats for a series of these tests can be obtained with:
-   ```
-   octave:61> ofdm_time_sync("../wav/vk2tpm_004.wav", 30)
-   <snip>
-   pass: 30 fails: 0 mean: 1.35 var 0.51
-   ```
-
-## Octave Acceptance Tests
-
-Here are some useful tests for the Octave, uncoded modem.
-
-The rate 1/2 LDPC code can correct up to about 10% raw BER, so a good test is to run the modem at Eb/No operating points that produce just less that BER=0.1. The BER2 measure truncates the effect of any start up transients, e.g. as the frequency offset is tracked out.
-
-1. HF Multipath:
-   ```
-   octave:580> ofdm_tx("ofdm_test.raw","700D",60,2,'mpm',20)
-   octave:581> ofdm_rx("ofdm_test.raw")
-   BER2.: 0.0803 Tbits: 84728 Terrs:  6803
-   ```
-
-1. AWGN:
-   ```
-   octave:582> ofdm_tx("ofdm_test.raw","700D",60,-2,'awgn')
-   octave:583> ofdm_rx("ofdm_test.raw")
-   BER2.: 0.0885 Tbits: 84252 Terrs:  7459
-   ```
-
-## C Acceptance Tests
-
-Here are some useful tests for the LDPC coded C version of the modem, useful to verify any changes.
-
-1. AWGN channel, -2dB:
-   ```
-   ./ofdm_mod --in /dev/zero --ldpc --testframes 60 --txbpf | ./ch - - --No -20 -f -10 | ./ofdm_demod --out /dev/null --testframes --verbose 1 --ldpc
-
-   SNR3k(dB): -1.85 C/No: 32.9 PAPR:  9.8
-   BER......: 0.0815 Tbits: 98532 Terrs:  8031
-   Coded BER: 0.0034 Tbits: 46368 Terrs:   157
-   ```
-
-1. Fading HF channel:
-   ```
-   ./ofdm_mod --in /dev/zero --ldpc --testframes 60 --txbpf | ./ch - - --No -24 -f -10 --fast | ./ofdm_demod --out /dev/null --testframes --verbose 1 --ldpc
-
-   SNR3k(dB):  2.15 C/No: 36.9 PAPR:  9.8
-   BER......: 0.1015 Tbits: 88774 Terrs:  9012
-   Coded BER: 0.0445 Tbits: 41776 Terrs:  1860
-   ```
-
-   Note: 10% Raw BER operating point on both channels, as per design.
-
-# Data Modes
-
-The OFDM modem can also support datac1/datac2/datac3 modes for packet data.  The OFDM modem was originally designed for very short (28 bit) voice codec packets.  For data, packets of hundreds to thousands of bits a desirable so we can use long, powerful FEC codewords, and reduce overhead.  The datac1/datac2/datac3 QPSK modes are currently under development.
-
-Here is an example of running the datac3 mode in a low SNR AWGN channel:
-
-```
-./src/ofdm_mod --mode datac3 --ldpc --in  /dev/zero --testframes 60 --verbose 1 | ./src/ch - - --No -20 | ./src/ofdm_demod --mode datac3 --ldpc --out /dev/null --testframes -v 1
-<snip>
-SNR3k(dB): -3.54 C/No: 31.2 PAPR: 10.4
-BER......: 0.1082 Tbits: 36096 Terrs:  3905 Tpackets:    47
-Coded BER: 0.0000 Tbits: 12032 Terrs:     0
-```
-Note despite the raw BER of 10%, 47/50 packets are received error free.
-
-# C Code
-
-| File | Description |
-| :-- | :-- |
-| ofdm.c | OFDM library |
-| codec2_ofdm.h | API header file for OFDM library |
-| ofdm_get_test_bits | Generate OFDM test frames |
-| ofdm_mod | OFDM modulator command line program |
-| ofdm_demod | OFDM demodulator command line program, supports uncoded (raw) and LDPC coded test frames, LDPC decoding of codec data, and can output LLRs to external LDPC decoder |
-| ofdm_put_test_bits | Measure BER in OFDM test frames |
-| unittest/tofdm | Run C port of modem to compare with octave version (see octave/tofdm) |
-| ch | C channel simulator |
-
-# Octave Scripts
-
-| File | Description |
-| :-- | :-- |
-| ofdm_lib | OFDM library |
-| ofdm_dev | Used for modem development, run various simulations |
-| ofdm_tx | Modulate test frames to a file of sample, cam add channel impairments |
-| ofdm_rx | Demod from a sample file and count errors |
-| tofdm | Compares Octave and C ports of modem |
-| ofdm_ldpc_tx | OFDM modulator with LDPC FEC |
-| ofdm_ldpc_rx | OFDM demodulator with LDPC FEC |
-
-## Specifications
-
-Nominal FreeDV 700D configuration:
-
-| Parameter | Value |
-| :-- | :-- |
-| Modem | OFDM, pilot assisted coherent QPSK |
-| Payload bits/s | 700 |
-| Text bits/s | 25 (note 4) |
-| Unique Word | 10 bits |
-| Carriers | 17 |
-| RF bandwidth | 944 Hz |
-| Symbol period | 18ms
-| Cyclic Prefix | 2ms (note 1)
-| Pilot rate | 1 in every 8 symbols |
-| Frame Period | 160ms |
-| FEC | rate 1/2 (224,112) LDPC |
-| Operating point | |
-|   AWGN | Eb/No -0.5dB SNR(3000Hz): -2.5dB (note 2) |
-|   HF Multipath | Eb/No  4.0dB SNR(3000Hz):  2.0dB (note 3) |
-|   Freq offset | +/- 60  Hz   (sync range) |
-| Freq drift | +/- 0.2 Hz/s (for 0.5 dB loss) |
-| Sample clock error | 1000 ppm |
-
-Notes:
-
-1. Modem can cope with up to 2ms of multipath
-1.
-   ```
-   Ideal SNR(3000) = Eb/No + 10*log10(Rb/B)
-                     = -1 + 10*log10(1400/3000)
-                     = -4.3 dB
-   ```
-   So we have about 1.8dB overhead for synchronisation, implementation loss,  and the text channel.
-1. "CCIR Poor" HF Multipath channel used for testing is two path, 1Hz Doppler, 1ms delay.
-1. The text channel is an auxiliary channel, unprotected by FEC, that typically carries callsign/location information for Ham stations.

third_party/codec2/cmake/GetDependencies.cmake.in

@@ -1,24 +0,0 @@
-# As this script is run in a new cmake instance, it does not have access to
-# the existing cache variables. Pass them in via the configure_file command.
-set(CMAKE_BINARY_DIR @CMAKE_BINARY_DIR@)
-set(CMAKE_SOURCE_DIR @CMAKE_SOURCE_DIR@)
-set(UNIX @UNIX@)
-set(WIN32 @WIN32@)
-set(CMAKE_CROSSCOMPILING @CMAKE_CROSSCOMPILING@)
-set(CMAKE_FIND_LIBRARY_SUFFIXES @CMAKE_FIND_LIBRARY_SUFFIXES@)
-set(CMAKE_FIND_LIBRARY_PREFIXES @CMAKE_FIND_LIBRARY_PREFIXES@)
-set(CMAKE_SYSTEM_LIBRARY_PATH @CMAKE_SYSTEM_LIBRARY_PATH@)
-set(CMAKE_FIND_ROOT_PATH @CMAKE_FIND_ROOT_PATH@)
-set(CODEC2_DLL ${CMAKE_BINARY_DIR}/src/libcodec2.dll)
-
-include(${CMAKE_SOURCE_DIR}/cmake/GetPrerequisites.cmake)
-get_prerequisites(${CODEC2_DLL} _deps 1 0 "" "")
-foreach(_runtime ${_deps})
-    message("Looking for ${_runtime}")
-    find_library(RUNTIME_${_runtime} ${_runtime})
-    message("${RUNTIME_${_runtime}}")
-    if(RUNTIME_${_runtime})
-        file(INSTALL DESTINATION "${CMAKE_INSTALL_PREFIX}/bin"
-        TYPE EXECUTABLE FILES "${RUNTIME_${_runtime}}")
-    endif()
-endforeach()

third_party/codec2/cmake/config.h.in

@@ -1,23 +0,0 @@
-/*--------------------------------------------------------------------------
- ** This file is autogenerated from config.h.in 
- ** during the cmake configuration of your project. If you need to make changes
- ** edit the original file NOT THIS FILE.
- ** --------------------------------------------------------------------------*/
-#ifndef _CONFIGURATION_HEADER_GUARD_H_
-#define _CONFIGURATION_HEADER_GUARD_H_
-
-#define SIZEOF_INT @SIZEOF_INT@
-#cmakedefine HAVE_STDLIB_H @HAVE_STDLIB_H@
-#cmakedefine HAVE_STRING_H @HAVE_STRING_H@
-#cmakedefine HAVE_FLOOR    @HAVE_FLOOR@
-#cmakedefine HAVE_CEIL     @HAVE_CEIL@
-#cmakedefine HAVE_MEMSET   @HAVE_MEMSET@
-#cmakedefine HAVE_POW      @HAVE_POW@
-#cmakedefine HAVE_SQRT     @HAVE_SQRT@
-#cmakedefine HAVE_SIN      @HAVE_SIN@
-#cmakedefine HAVE_COS      @HAVE_COS@
-#cmakedefine HAVE_ATAN2    @HAVE_ATAN2@
-#cmakedefine HAVE_LOG10    @HAVE_LOG10@
-#cmakedefine HAVE_ROUND    @HAVE_ROUND@
-#cmakedefine HAVE_GETOPT   @HAVE_GETOPT@
-#endif

third_party/codec2/cmake/version.h.in

@@ -1,37 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: version.h
-  AUTHOR......: Tomas Härdin
-  DATE CREATED: 03 November 2017
-
-  Codec 2 VERSION #defines
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2017 Tomas Härdin
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-//this functions both as an include guard and your typical HAVE macro
-#ifndef CODEC2_HAVE_VERSION
-#define CODEC2_HAVE_VERSION
-
-#define CODEC2_VERSION_MAJOR @CODEC2_VERSION_MAJOR@
-#define CODEC2_VERSION_MINOR @CODEC2_VERSION_MINOR@
-#cmakedefine CODEC2_VERSION_PATCH @CODEC2_VERSION_PATCH@
-#define CODEC2_VERSION "@CODEC2_VERSION@"
-
-#endif //CODEC2_HAVE_VERSION

third_party/codec2/codec2.pc.in

@@ -1,10 +0,0 @@
-prefix=@CMAKE_INSTALL_PREFIX@
-libdir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBDIR@
-includedir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@
-
-Name: codec2
-Description: A speech codec for 2400 bit/s and below
-Requires: 
-Version: @CODEC2_VERSION@
-Libs: -L${libdir} -lcodec2
-Cflags: -I${includedir} -I${includedir}/codec2

third_party/codec2/codec2.podspec

@@ -1,18 +0,0 @@
-Pod::Spec.new do |s|
-  s.name             = 'codec2'
-  s.version          = '1.2.0'
-  s.summary          = 'Codec2 voice codec'
-  s.description      = 'Codec2 voice codec library (LGPL-2.1)'
-  s.homepage         = 'https://www.rowetel.com/codec2.html'
-  s.license          = { :type => 'LGPL-2.1', :file => 'COPYING' }
-  s.author           = { 'David Rowe' => 'david@rowetel.com' }
-  s.source           = { :path => '.' }
-  s.platform         = :ios, '12.0'
-  s.source_files     = 'src/**/*.{c,h}'
-  s.public_header_files = 'src/codec2.h'
-  s.pod_target_xcconfig = {
-    'HEADER_SEARCH_PATHS' => '"$(PODS_TARGET_SRCROOT)/src" "$(PODS_TARGET_SRCROOT)/include"',
-  }
-  s.compiler_flags   = '-std=gnu11'
-  s.libraries        = 'm'
-end

third_party/codec2/demo/CMakeLists.txt

@@ -1,17 +0,0 @@
-add_definitions(-DFLOATING_POINT -DVAR_ARRAYS)
-include_directories(../src)
-
-add_executable(c2demo c2demo.c)
-target_link_libraries(c2demo codec2)
-add_executable(freedv_700d_tx freedv_700d_tx.c)
-target_link_libraries(freedv_700d_tx codec2)
-add_executable(freedv_700d_rx freedv_700d_rx.c)
-target_link_libraries(freedv_700d_rx codec2)
-add_executable(freedv_datac1_tx freedv_datac1_tx.c)
-target_link_libraries(freedv_datac1_tx codec2)
-add_executable(freedv_datac1_rx freedv_datac1_rx.c)
-target_link_libraries(freedv_datac1_rx codec2)
-add_executable(freedv_datac0c1_tx freedv_datac0c1_tx.c)
-target_link_libraries(freedv_datac0c1_tx codec2)
-add_executable(freedv_datac0c1_rx freedv_datac0c1_rx.c)
-target_link_libraries(freedv_datac0c1_rx codec2)

third_party/codec2/demo/c2demo.c

@@ -1,77 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: c2demo.c
-  AUTHOR......: David Rowe
-  DATE CREATED: 15/11/2010
-
-  Encodes and decodes a file of raw speech samples using Codec 2.
-  Demonstrates use of Codec 2 function API.
-
-  cd codec2/build_linux
-  ./demo/c2demo ../raw/hts1a.raw his1a_out.raw
-  aplay -f S16_LE hts1a_out.raw
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2010 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "codec2.h"
-
-int main(int argc, char *argv[]) {
-  struct CODEC2 *codec2;
-  FILE *fin;
-  FILE *fout;
-
-  if (argc != 3) {
-    printf("usage: %s InputRawSpeechFile OutputRawSpeechFile\n", argv[0]);
-    exit(1);
-  }
-
-  if ((fin = fopen(argv[1], "rb")) == NULL) {
-    fprintf(stderr, "Error opening input speech file: %s\n", argv[1]);
-    exit(1);
-  }
-
-  if ((fout = fopen(argv[2], "wb")) == NULL) {
-    fprintf(stderr, "Error opening output speech file: %s\n", argv[2]);
-    exit(1);
-  }
-
-  /* Note only one set of Codec 2 states is required for an encoder
-     and decoder pair. */
-  codec2 = codec2_create(CODEC2_MODE_1300);
-  size_t nsam = codec2_samples_per_frame(codec2);
-  short speech_samples[nsam];
-  /* Bits from the encoder are packed into bytes */
-  unsigned char compressed_bytes[codec2_bytes_per_frame(codec2)];
-
-  while (fread(speech_samples, sizeof(short), nsam, fin) == nsam) {
-    codec2_encode(codec2, compressed_bytes, speech_samples);
-    codec2_decode(codec2, speech_samples, compressed_bytes);
-    fwrite(speech_samples, sizeof(short), nsam, fout);
-  }
-
-  codec2_destroy(codec2);
-  fclose(fin);
-  fclose(fout);
-
-  return 0;
-}

third_party/codec2/demo/freedv_700d_rx.c

@@ -1,55 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: freedv_700d_rx.c
-  AUTHOR......: David Rowe
-  DATE CREATED: April 2021
-
-  Demo receive program for FreeDV API (700D mode), see freedv_700d_tx.c for
-  instructions.
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2021 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "freedv_api.h"
-
-int main(int argc, char *argv[]) {
-  struct freedv *freedv;
-
-  freedv = freedv_open(FREEDV_MODE_700D);
-  assert(freedv != NULL);
-
-  /* note API functions to tell us how big our buffers need to be */
-  short speech_out[freedv_get_n_max_speech_samples(freedv)];
-  short demod_in[freedv_get_n_max_modem_samples(freedv)];
-
-  size_t nin, nout;
-  nin = freedv_nin(freedv);
-  while (fread(demod_in, sizeof(short), nin, stdin) == nin) {
-    nout = freedv_rx(freedv, speech_out, demod_in);
-    nin = freedv_nin(freedv); /* call me on every loop! */
-    fwrite(speech_out, sizeof(short), nout, stdout);
-  }
-
-  freedv_close(freedv);
-  return 0;
-}

third_party/codec2/demo/freedv_700d_rx.py

@@ -1,49 +0,0 @@
-#!/usr/bin/env python3
-'''
-  Demo receive program for FreeDV API 700D mode.
-
-  cd ~/codec2/build_linux
-  cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ../demo/freedv_700d_rx.py | aplay -f S16_LE
-
-  Credits: Thanks DJ2LS, xssfox, VK5QI
-'''
-
-import ctypes
-from ctypes import *
-import sys
-import pathlib
-import platform
-
-if platform.system() == 'Darwin':
-    libname = pathlib.Path().absolute() / "src/libcodec2.dylib" 
-else:
-    libname = pathlib.Path().absolute() / "src/libcodec2.so" 
-
-# See: https://docs.python.org/3/library/ctypes.html
- 
-c_lib = ctypes.CDLL(libname)
-
-c_lib.freedv_open.argype = [c_int]
-c_lib.freedv_open.restype = c_void_p
-
-c_lib.freedv_get_n_max_speech_samples.argtype = [c_void_p]
-c_lib.freedv_get_n_max_speech_samples.restype = c_int
-
-c_lib.freedv_nin.argtype = [c_void_p]
-c_lib.freedv_nin.restype = c_int
-
-c_lib.freedv_rx.argtype = [c_void_p, c_char_p, c_char_p]
-c_lib.freedv_rx.restype = c_int
-
-FREEDV_MODE_700D = 7 # from freedv_api.h             
-freedv = cast(c_lib.freedv_open(FREEDV_MODE_700D), c_void_p)
-
-n_max_speech_samples = c_lib.freedv_get_n_max_speech_samples(freedv)
-speech_out = create_string_buffer(2*n_max_speech_samples)
-
-while True:
-    nin = c_lib.freedv_nin(freedv)
-    demod_in = sys.stdin.buffer.read(nin*2)
-    if len(demod_in) == 0: quit()
-    nout = c_lib.freedv_rx(freedv, speech_out, demod_in)
-    sys.stdout.buffer.write(speech_out[:nout*2])

third_party/codec2/demo/freedv_700d_tx.c

@@ -1,68 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: freedv_700d_tx.c
-  AUTHOR......: David Rowe
-  DATE CREATED: April 2021
-
-  Demo transmit program using the FreeDV API (700D mode).
-
-  usage:
-
-  cd ~/codec2/build_linux
-  cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ./demo/freedv_700d_rx |
-aplay -f S16_LE
-
-  Listen to the modulated Tx signal:
-
-  cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | aplay -f S16_LE
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2021 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "freedv_api.h"
-
-int main(int argc, char *argv[]) {
-  struct freedv *freedv;
-
-  freedv = freedv_open(FREEDV_MODE_700D);
-  assert(freedv != NULL);
-
-  /* handy functions to set buffer sizes */
-  int n_speech_samples = freedv_get_n_speech_samples(freedv);
-  short speech_in[n_speech_samples];
-  int n_nom_modem_samples = freedv_get_n_nom_modem_samples(freedv);
-  short mod_out[n_nom_modem_samples];
-
-  /* OK main loop  --------------------------------------- */
-
-  while (fread(speech_in, sizeof(short), n_speech_samples, stdin) ==
-         n_speech_samples) {
-    freedv_tx(freedv, mod_out, speech_in);
-    fwrite(mod_out, sizeof(short), n_nom_modem_samples, stdout);
-  }
-
-  freedv_close(freedv);
-
-  return 0;
-}

third_party/codec2/demo/freedv_datac0c1_rx.c

@@ -1,130 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: freedv_datac0c1_rx.c
-  AUTHOR......: David Rowe
-  DATE CREATED: Dec 2021
-
-  Demonstrates receiving frames of raw data bytes using the FreeDV
-  API.  Two parallel receivers are running, so we can receive either
-  DATAC0 or DATAC1 frames.  Demonstrates a common use case for HF data
-  - the ability to receive signalling as well as payload data frames.
-
-  usage:
-
-  cd codec2/build_linux
-  ./demo/freedv_datacc01_tx | ./demo/freedv_datac0c1_rx
-
-  Give it a hard time with some channel noise, frequency offset, and sample
-  clock offsets:
-
-  ./demo/freedv_datac0c1_tx | ./src/cohpsk_ch - - -24 -f 20 --Fs 8000 |
-  sox -t .s16 -c 1 -r 8000 - -t .s16 -c 1 -r 8008 - |
-  ./demo/freedv_datac0c1_rx
-
-  Replace the final line with "aplay -f S16" to listen to the
-  simulated Rx signal.
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2021 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "freedv_api.h"
-
-#define NBUF 160
-
-int run_receiver(struct freedv *freedv, short buf[], short demod_in[], int *pn,
-                 uint8_t bytes_out[]);
-
-int main(int argc, char *argv[]) {
-  // set up DATAC0 Rx
-  struct freedv *freedv_c0 = freedv_open(FREEDV_MODE_DATAC0);
-  assert(freedv_c0 != NULL);
-  freedv_set_frames_per_burst(freedv_c0, 1);
-  freedv_set_verbose(freedv_c0, 0);
-  int bytes_per_modem_frame_c0 = freedv_get_bits_per_modem_frame(freedv_c0) / 8;
-  uint8_t bytes_out_c0[bytes_per_modem_frame_c0];
-  short demod_in_c0[freedv_get_n_max_modem_samples(freedv_c0)];
-
-  // set up DATAC1 Rx
-  struct freedv *freedv_c1 = freedv_open(FREEDV_MODE_DATAC1);
-  assert(freedv_c1 != NULL);
-  freedv_set_frames_per_burst(freedv_c1, 1);
-  freedv_set_verbose(freedv_c1, 0);
-  int bytes_per_modem_frame_c1 = freedv_get_bits_per_modem_frame(freedv_c1) / 8;
-  uint8_t bytes_out_c1[bytes_per_modem_frame_c1];
-  short demod_in_c1[freedv_get_n_max_modem_samples(freedv_c1)];
-
-  // number of samples in demod_in buffer for each Rx
-  int n_c0 = 0;
-  int n_c1 = 0;
-  // number of frames received in each mode
-  int c0_frames = 0;
-  int c1_frames = 0;
-
-  short buf[NBUF];
-
-  // read a fixed buffer from stdin, use that to fill c0 and c1 demod_in buffers
-  while (fread(buf, sizeof(short), NBUF, stdin) == NBUF) {
-    if (run_receiver(freedv_c0, buf, demod_in_c0, &n_c0, bytes_out_c0)) {
-      fprintf(stderr, "DATAC0 frame received!\n");
-      c0_frames++;
-    }
-    if (run_receiver(freedv_c1, buf, demod_in_c1, &n_c1, bytes_out_c1)) {
-      fprintf(stderr, "DATAC1 frame received!\n");
-      c1_frames++;
-    }
-  }
-
-  fprintf(stderr, "DATAC0 Frames: %d DATAC1 Frames: %d\n", c0_frames,
-          c1_frames);
-
-  freedv_close(freedv_c0);
-  freedv_close(freedv_c1);
-
-  return 0;
-}
-
-int run_receiver(struct freedv *freedv, short buf[], short demod_in[], int *pn,
-                 uint8_t bytes_out[]) {
-  int n = *pn;
-  int nbytes_out = 0;
-  int nin;
-
-  // NBUF new samples into DATAC1 Rx
-  memcpy(&demod_in[n], buf, sizeof(short) * NBUF);
-  n += NBUF;
-  assert(n <= freedv_get_n_max_modem_samples(freedv));
-  nin = freedv_nin(freedv);
-  while (n > nin) {
-    nbytes_out = freedv_rawdatarx(freedv, bytes_out, demod_in);
-    // nin samples were read
-    n -= nin;
-    assert(n >= 0);
-    memmove(demod_in, &demod_in[nin], sizeof(short) * n);
-    nin = freedv_nin(freedv);
-  }
-
-  *pn = n;
-  return nbytes_out;
-}

third_party/codec2/demo/freedv_datac0c1_tx.c

@@ -1,109 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: freedv_datac0c1_tx.c
-  AUTHOR......: David Rowe
-  DATE CREATED: Dec 2021
-
-  Transmitting alternate frames of two different raw data modes.  See
-  freedv_datac0c1_rx.c
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2021 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "freedv_api.h"
-#include "ofdm_internal.h"
-
-#define FRAMES 10
-
-void send_burst(struct freedv *freedv);
-
-int main(void) {
-  struct freedv *freedv_c0, *freedv_c1;
-
-  freedv_c0 = freedv_open(FREEDV_MODE_DATAC0);
-  assert(freedv_c0 != NULL);
-  freedv_c1 = freedv_open(FREEDV_MODE_DATAC1);
-  assert(freedv_c1 != NULL);
-
-  // send frames in different modes in random order
-  int c0_frames = 0;
-  int c1_frames = 0;
-  while ((c0_frames < FRAMES) || (c1_frames < FRAMES)) {
-    if (rand() & 1) {
-      if (c0_frames < FRAMES) {
-        send_burst(freedv_c0);
-        c0_frames++;
-      }
-    } else {
-      if (c1_frames < FRAMES) {
-        send_burst(freedv_c1);
-        c1_frames++;
-      }
-    }
-  }
-
-  freedv_close(freedv_c0);
-  freedv_close(freedv_c1);
-
-  return 0;
-}
-
-void send_burst(struct freedv *freedv) {
-  size_t bits_per_frame = freedv_get_bits_per_modem_frame(freedv);
-  size_t bytes_per_modem_frame = bits_per_frame / 8;
-  size_t payload_bytes_per_modem_frame =
-      bytes_per_modem_frame - 2; /* 16 bits used for the CRC */
-  size_t n_mod_out = freedv_get_n_tx_modem_samples(freedv);
-  uint8_t bytes_in[bytes_per_modem_frame];
-  short mod_out_short[n_mod_out];
-
-  /* generate a test frame */
-  uint8_t testframe_bits[bits_per_frame];
-  ofdm_generate_payload_data_bits(testframe_bits, bits_per_frame);
-  freedv_pack(bytes_in, testframe_bits, bits_per_frame);
-
-  /* send preamble */
-  int n_preamble = freedv_rawdatapreambletx(freedv, mod_out_short);
-  fwrite(mod_out_short, sizeof(short), n_preamble, stdout);
-
-  /* The raw data modes require a CRC in the last two bytes */
-  uint16_t crc16 = freedv_gen_crc16(bytes_in, payload_bytes_per_modem_frame);
-  bytes_in[bytes_per_modem_frame - 2] = crc16 >> 8;
-  bytes_in[bytes_per_modem_frame - 1] = crc16 & 0xff;
-
-  /* modulate and send a data frame */
-  freedv_rawdatatx(freedv, mod_out_short, bytes_in);
-  fwrite(mod_out_short, sizeof(short), n_mod_out, stdout);
-
-  /* send postamble */
-  int n_postamble = freedv_rawdatapostambletx(freedv, mod_out_short);
-  fwrite(mod_out_short, sizeof(short), n_postamble, stdout);
-
-  /* create some silence between bursts */
-  int inter_burst_delay_ms = 200;
-  int samples_delay = FREEDV_FS_8000 * inter_burst_delay_ms / 1000;
-  short sil_short[samples_delay];
-  for (int i = 0; i < samples_delay; i++) sil_short[i] = 0;
-  fwrite(sil_short, sizeof(short), samples_delay, stdout);
-}

third_party/codec2/demo/freedv_datac1_rx.c

@@ -1,63 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: freedv_datac1_rx.c
-  AUTHOR......: David Rowe
-  DATE CREATED: April 2021
-
-  Demonstrates receiving frames of raw data bytes using the FreeDV API.
-
-  See freedv_datac1_tx.c for instructions.
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2021 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "freedv_api.h"
-
-int main(int argc, char *argv[]) {
-  struct freedv *freedv;
-
-  freedv = freedv_open(FREEDV_MODE_DATAC1);
-  assert(freedv != NULL);
-  freedv_set_frames_per_burst(freedv, 1);
-  freedv_set_verbose(freedv, 2);
-
-  int bytes_per_modem_frame = freedv_get_bits_per_modem_frame(freedv) / 8;
-  uint8_t bytes_out[bytes_per_modem_frame];
-  short demod_in[freedv_get_n_max_modem_samples(freedv)];
-
-  size_t nin, nbytes_out;
-  nin = freedv_nin(freedv);
-  while (fread(demod_in, sizeof(short), nin, stdin) == nin) {
-    nbytes_out = freedv_rawdatarx(freedv, bytes_out, demod_in);
-    nin = freedv_nin(freedv); /* must call this every loop */
-    if (nbytes_out) {
-      /* don't output CRC */
-      fwrite(bytes_out, sizeof(uint8_t), nbytes_out - 2, stdout);
-    }
-  }
-
-  freedv_close(freedv);
-
-  return 0;
-}

third_party/codec2/demo/freedv_datac1_tx.c

@@ -1,98 +0,0 @@
-/*---------------------------------------------------------------------------*\
-
-  FILE........: freedv_datac1_tx.c
-  AUTHOR......: David Rowe
-  DATE CREATED: April 2021
-
-  Demonstrates transmitting frames of raw data bytes using the FreeDV API datac1
-  mode.  The data on stdin is transmitted as a sequence of modulated bursts.
-
-  Format of each burst: ...|preamble|data frame|postamble|silence|....
-
-  There is just one data frame per burst in this demo.
-
-  usage:
-
-  cd codec2/build_linux
-  head -c $((510*10)) </dev/urandom > binaryIn.bin
-  cat binaryIn.bin | ./demo/freedv_datac1_tx | ./demo/freedv_datac1_rx >
-binaryOut.bin diff binaryIn.bin binaryOut.bin
-
-  Listen to the modulated Tx signal:
-
-  cat binaryIn.bin | ./demo/freedv_datac1_tx | aplay -f S16_LE
-
-\*---------------------------------------------------------------------------*/
-
-/*
-  Copyright (C) 2021 David Rowe
-
-  All rights reserved.
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License version 2.1, as
-  published by the Free Software Foundation.  This program is
-  distributed in the hope that it will be useful, but WITHOUT ANY
-  WARRANTY; without even the implied warranty of MERCHANTABILITY or
-  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
-  License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with this program; if not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <assert.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "freedv_api.h"
-
-int main(int argc, char *argv[]) {
-  struct freedv *freedv;
-
-  freedv = freedv_open(FREEDV_MODE_DATAC1);
-  assert(freedv != NULL);
-
-  size_t bytes_per_modem_frame = freedv_get_bits_per_modem_frame(freedv) / 8;
-  size_t payload_bytes_per_modem_frame =
-      bytes_per_modem_frame - 2; /* 16 bits used for the CRC */
-  size_t n_mod_out = freedv_get_n_tx_modem_samples(freedv);
-  uint8_t bytes_in[bytes_per_modem_frame];
-  short mod_out_short[n_mod_out];
-
-  for (int b = 0; b < 10; b++) {
-    /* send preamble */
-    int n_preamble = freedv_rawdatapreambletx(freedv, mod_out_short);
-    fwrite(mod_out_short, sizeof(short), n_preamble, stdout);
-
-    /* read our input data frame from stdin */
-    size_t nread =
-        fread(bytes_in, sizeof(uint8_t), payload_bytes_per_modem_frame, stdin);
-    if (nread != payload_bytes_per_modem_frame) break;
-
-    /* The raw data modes require a CRC in the last two bytes */
-    uint16_t crc16 = freedv_gen_crc16(bytes_in, payload_bytes_per_modem_frame);
-    bytes_in[bytes_per_modem_frame - 2] = crc16 >> 8;
-    bytes_in[bytes_per_modem_frame - 1] = crc16 & 0xff;
-
-    /* modulate and send a data frame */
-    freedv_rawdatatx(freedv, mod_out_short, bytes_in);
-    fwrite(mod_out_short, sizeof(short), n_mod_out, stdout);
-
-    /* send postamble */
-    int n_postamble = freedv_rawdatapostambletx(freedv, mod_out_short);
-    fwrite(mod_out_short, sizeof(short), n_postamble, stdout);
-
-    /* create some silence between bursts */
-    int inter_burst_delay_ms = 200;
-    int samples_delay = FREEDV_FS_8000 * inter_burst_delay_ms / 1000;
-    short sil_short[samples_delay];
-    for (int i = 0; i < samples_delay; i++) sil_short[i] = 0;
-    fwrite(sil_short, sizeof(short), samples_delay, stdout);
-  }
-
-  freedv_close(freedv);
-
-  return 0;
-}

third_party/codec2/doc/Makefile

@@ -1,35 +0,0 @@
-# Makefile for codec2.pdf
-#
-# usage:
-#   Build codec2 with -DUNITEST=1 (see README)
-#   cd ~/codec2/doc
-#   make
-
-DOCNAME ?= codec2
-
-# Set these externally to override defaults. JOBNAME sets the output file basename, 
-# and avoids over writing codec2.pdf (e.g. when we are running a doc build test, but don't actually
-# want to change codec2.pdf in the repo) 
-
-CODEC2_SRC ?= $(HOME)/codec2
-CODEC2_BINARY ?= $(HOME)/codec2/build_linux
-JOBNAME ?= $(DOCNAME)
-
-PATH := $(PATH):$(CODEC2_BINARY)/src
-
-PLOT_FILES := hts2a_37_sn.tex hts2a_37_sw.tex hts2a_37_lpc_lsp.tex hts2a_37_lpc_pf.tex
-
-$(DOCNAME).pdf: $(PLOT_FILES) $(DOCNAME).tex $(DOCNAME)_refs.bib
-	pdflatex -shell-escape -file-line-error -jobname=$(JOBNAME) $(DOCNAME).tex 
-	bibtex   $(JOBNAME).aux
-	pdflatex -shell-escape -file-line-error -jobname=$(JOBNAME) $(DOCNAME).tex
-	pdflatex -shell-escape -file-line-error -jobname=$(JOBNAME) $(DOCNAME).tex
-
-$(PLOT_FILES):
-	echo $(PATH)
-	c2sim $(CODEC2_SRC)/raw/hts2a.raw --dump hts2a --lpc 10 --lsp --lpcpf
-	DISPLAY=""; printf "plamp('hts2a',f=37,epslatex=1)\nq\n" | octave-cli -qf -p $(CODEC2_SRC)/octave
-
-.PHONY: clean
-clean:
-	rm -f *.blg *.bbl *.aux *.log *.out hts2a*

third_party/codec2/doc/codec2_refs.bib

@@ -1,84 +0,0 @@
-@article{griffin1988multiband,
-  title={Multiband excitation vocoder},
-  author={Griffin, Daniel W and Lim, Jae S},
-  journal={IEEE Transactions on acoustics, speech, and signal processing},
-  volume={36},
-  number={8},
-  pages={1223--1235},
-  year={1988},
-  publisher={IEEE}
-}
-@book{rowe1997techniques,
-  title={Techniques for harmonic sinusoidal coding},
-  author={Rowe, David Grant},
-  year={1997},
-  publisher={Citeseer},
-  note = {\url{https://www.rowetel.com/downloads/1997_rowe_phd_thesis.pdf}}
-}
-
-@misc{ardc2023,
-  title = {{Enhancing HF Digital Voice with FreeDV}},
-  year = {2023}, 
-  note = {\url{https://www.ardc.net/apply/grants/2023-grants/enhancing-hf-digital-voice-with-freedv/}}
-}
-
-@article{mcaulay1986speech,
-  title={Speech analysis/synthesis based on a sinusoidal representation},
-  author={McAulay, Robert and Quatieri, Thomas},
-  journal={IEEE Transactions on Acoustics, Speech, and Signal Processing},
-  volume={34},
-  number={4},
-  pages={744--754},
-  year={1986},
-  publisher={IEEE}
-}
-
-@article{makhoul1975linear,
-  title={Linear prediction: A tutorial review},
-  author={Makhoul, John},
-  journal={Proceedings of the IEEE},
-  volume={63},
-  number={4},
-  pages={561--580},
-  year={1975},
-  publisher={IEEE}
-}
-
-@article{itakura1975line,
-  title={Line spectrum representation of linear predictor coefficients of speech signals},
-  author={Itakura, Fumitada},
-  journal={The Journal of the Acoustical Society of America},
-  volume={57},
-  number={S1},
-  pages={S35--S35},
-  year={1975},
-  publisher={AIP Publishing}
-}
-
-
-@book{o1997human,
-  title={Speech Communication - Human and machine},
-  author={O‘Shaughnessy, Douglas},
-  publisher={Addison-Wesley Publishing Company},
-  year={1997}
-}
-
-@misc{rowe2023ratek,
-  title = {{FreeDV-015 Codec 2 Rate K Resampler}},
-  year = {2023}, 
-  note = {\url{https://github.com/drowe67/misc/blob/master/ratek_resampler/ratek_resampler.pdf}}
-}
-
-@book{kondoz1994digital,
-  title={Digital speech: coding for low bit rate communication systems},
-  author={Kondoz, Ahmet M},
-  year={1994},
-  publisher={John Wiley \& Sons}
-}
-
-@book{kleijn1995speech,
-  title={Speech coding and synthesis},
-  author={Kleijn, W Bastiaan and Paliwal, Kuldip K},
-  year={1995},
-  publisher={Elsevier Science Inc.}
-}

third_party/codec2/include/codec2/version.h

@@ -1,9 +0,0 @@
-#ifndef CODEC2_HAVE_VERSION
-#define CODEC2_HAVE_VERSION
-
-#define CODEC2_VERSION_MAJOR 1
-#define CODEC2_VERSION_MINOR 2
-#define CODEC2_VERSION_PATCH 0
-#define CODEC2_VERSION "1.2.0"
-
-#endif

third_party/codec2/include/config.h

@@ -1,19 +0,0 @@
-#ifndef _CONFIGURATION_HEADER_GUARD_H_
-#define _CONFIGURATION_HEADER_GUARD_H_
-
-#define SIZEOF_INT 4
-#define HAVE_STDLIB_H 1
-#define HAVE_STRING_H 1
-#define HAVE_FLOOR 1
-#define HAVE_CEIL 1
-#define HAVE_MEMSET 1
-#define HAVE_POW 1
-#define HAVE_SQRT 1
-#define HAVE_SIN 1
-#define HAVE_COS 1
-#define HAVE_ATAN2 1
-#define HAVE_LOG10 1
-#define HAVE_ROUND 1
-#define HAVE_GETOPT 0
-
-#endif

third_party/codec2/octave/HRA_112_112.txt

@@ -1,119 +0,0 @@
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-# name: HRA_112_112
-# type: matrix
-# rows: 112
-# columns: 224
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-
-

third_party/codec2/octave/Mat2Hrows.m

@@ -1,28 +0,0 @@
-function [Hrows Hcols] = Mat2Hrows(HRA, RAmode); 
-
-H = full(HRA); 
-[Nr Nc] = size(H);
-
-if nargin==1, RAmode = 1; end; 
-
-if RAmode==1
-   H= H(:,1:Nc-Nr); 
-   [Nr Nc] = size(H); 
-end 
-
-Max_colwt = max(sum(H));
-Max_rowwt = max(sum(H')); 
-Hcols = zeros(Nc, Max_colwt); 
-Hrows = zeros(Nr, Max_rowwt); 
-
-for i = 1:Nr
-    nz = find(H(i,:)); 
-    Hrows(i,1:length(nz)) = nz; 
-end
-
-H = H'; 
-for i = 1:Nc
-    nz = find(H(i,:)); 
-    Hcols(i,1:length(nz)) = nz; 
-end
-    

third_party/codec2/octave/autotest.m

@@ -1,119 +0,0 @@
-% autotest.m
-% David Rowe Mar 2015
-%
-% Helper functions to plot output of C version and difference between Octave and C versions
-
-1;
-
-function stem_sig_and_error(plotnum, subplotnum, sig, error, titlestr, axisvec)
-  global no_plot_list;
-
-  if find(no_plot_list == plotnum)
-    return;
-  end
-  
-  figure(plotnum)
-  subplot(subplotnum)
-  stem(sig,'g;Octave version;');
-  hold on;
-  stem(error,'r;Octave - C version (hopefully 0);');
-  hold off;
-  if nargin == 6
-    axis(axisvec);
-  end
-  title(titlestr);
-endfunction
-
-
-function plot_sig_and_error(plotnum, subplotnum, sig, error, titlestr, axisvec)
-  global no_plot_list;
-
-  if find(no_plot_list == plotnum)
-    return;
-  end
-  
-  figure(plotnum)
-  subplot(subplotnum)
-  plot(sig,'g;Octave version;');
-  hold on;
-  plot(error,'r;Octave - C version (hopefully 0);');
-  hold off;
-  if nargin == 6
-    axis(axisvec);
-  end
-  title(titlestr);
-endfunction
-
-
-function pass = check(a, b, test_name, tol, its_an_angle = 0)
-  global passes;
-  global fails;
-
-  if nargin == 3
-    tol = 1E-3;
-  end
-
-  [m n] = size(a);
-  if m > n
-    ll = m;
-  else
-    ll = n;
-  end
-
-  printf("%s", test_name);
-  for i=1:(25-length(test_name))
-    printf(".");
-  end
-  printf(": ");  
-  
-  if its_an_angle
-    % take into account pi is close to -pi for angles in rads
-    e = sum(sum(abs(exp(j*a) - exp(j*b)))/ll);
-  else
-    e = sum(sum(abs(a - b))/ll);
-  end
-
-  if e < tol
-    printf("OK\n");
-    pass = true;
-    passes++;
-  else
-    printf("FAIL (%f)\n",e);
-    pass = false;
-    fails++;
-  end
-endfunction
-
-function pass = check_no_abs(a, b, test_name)
-  global passes;
-  global fails;
-
-  tol = 1E-3;
-
-  [m n] = size(a);
-  if m > n
-    ll = m;
-  else
-    ll = n;
-  end
-
-  printf("%s", test_name);
-  for i=1:(25-length(test_name))
-    printf(".");
-  end
-  printf(": ");  
-  
-  e = sum(sum(a - b)/ll);
-
-  if e < tol
-    pass = true;
-    printf("OK\n");
-    passes++;
-  else
-    pass = false;
-    printf("FAIL (%f)\n",e);
-    fails++;
-  end
-endfunction
-
-

third_party/codec2/octave/ch_fading.m

@@ -1,27 +0,0 @@
-% ch_fading.m
-% David Rowe
-% April 2018
-
-% function to write float fading samples for use by C programs
-
-function ch_fading(raw_file_name, Fs, dopplerSpreadHz, len_samples)
-  randn('seed',1);
-  spread = doppler_spread(dopplerSpreadHz, Fs, len_samples);
-  spread_2ms = doppler_spread(dopplerSpreadHz, Fs, len_samples);
-  hf_gain = 1.0/sqrt(var(spread)+var(spread_2ms));
-  printf("hf_gain: %f\n", hf_gain);
-  
-  % interleave real imag samples
-
-  inter = zeros(1,len_samples*4);
-  inter(1:4) = hf_gain;
-  for i=1:len_samples
-    inter(i*4+1) = real(spread(i));
-    inter(i*4+2) = imag(spread(i));
-    inter(i*4+3) = real(spread_2ms(i));
-    inter(i*4+4) = imag(spread_2ms(i));
-  end
-  f = fopen(raw_file_name,"wb");
-  fwrite(f, inter, "float32");
-  fclose(f);
-endfunction

third_party/codec2/octave/channel_lib.m

@@ -1,72 +0,0 @@
-% channel_lib.m
-%
-% Commonly used channel simulation functions
-
-1;
-
-function [spread1 spread2 path_delay_samples] = channel_multipath(channel, Fs, Nsam)
-    % Winlink multipath definitions
-    if strcmp(channel, 'mpg')     dopplerSpreadHz = 0.1; path_delay_ms = 0.5;
-    elseif strcmp(channel, 'mpm') dopplerSpreadHz = 0.5; path_delay_ms = 1.0;
-    elseif strcmp(channel, 'mpp') dopplerSpreadHz = 1.0; path_delay_ms = 2.0;
-    elseif strcmp(channel, 'mpd') dopplerSpreadHz = 2.0; path_delay_ms = 4.0;
-    elseif strcmp(channel, 'mpf') dopplerSpreadHz = 4.0; path_delay_ms = 4.0;
-    elseif strcmp(channel, 'notch') dopplerSpreadHz = 0.0; path_delay_ms = 2.0;
-    elseif printf("Unknown multipath channel\n"); assert(0); end
-
-    path_delay_samples = path_delay_ms*Fs/1000;
-    %printf(" Doppler Spread: %3.2f Hz Path Delay: %3.2f ms %d samples\n", dopplerSpreadHz, path_delay_ms, path_delay_samples);
-
-    if strcmp(channel, "notch")
-      % simple notch filter (not time varying), hand tweaked to be 10dB down at about 1300 Hz (Fc-200Hz)
-      spread1 = 0.5*ones(1,Nsam);
-      spread2 = j*0.2*ones(1,Nsam);
-    else
-      % generate same fading pattern for every run
-      spread1 = doppler_spread(dopplerSpreadHz, Fs, Nsam);
-      spread2 = doppler_spread(dopplerSpreadHz, Fs, Nsam);
-    end
-    
-    % sometimes doppler_spread() doesn't return exactly the number of samples we need
-    if length(spread1) < Nsam
-      printf("not enough doppler spreading samples %d %d\n", length(spread1), Nsam);
-      assert(0);
-    end
-    if length(spread2) < Nsam
-      printf("not enough doppler spreading samples %d %d\n", length(spread2), Nsam);
-      assert(0);
-    end
-endfunction
-
-% returns real rx signal with noise added, input is complex tx signal
-function [rx_real rx sigma] = channel_simulate(Fs, SNR3kdB, freq_offset_Hz, channel, tx, verbose=0)
-  Nsam = length(tx);
-  rx = tx;
-
-  if strcmp(channel, 'awgn') == 0
-    [spread1 spread2 path_delay_samples] = channel_multipath(channel, Fs, Nsam);
-    rx  = tx(1:Nsam) .* spread1(1:Nsam);
-    rx += [zeros(1,path_delay_samples) tx(1:Nsam-path_delay_samples)] .* spread2(1:Nsam);
-  end
-
-  woffset = 2*pi*freq_offset_Hz/Fs;
-  rx = rx .* exp(j*woffset*(1:Nsam));
-
-  rx_real = real(rx); S = rx_real*rx_real';
-  rpapr = 10*log10(max(abs(rx_real).^2)/mean(abs(rx_real).^2));
-
-  % SNR in a 4k bandwidth will be lower than 3k as total noise power N is higher
-  SNR4kdB = SNR3kdB - 10*log10(Fs/2) + 10*log10(3000); SNR = 10^(SNR4kdB/10);
-  N = S/SNR; sigma = sqrt(N/Nsam);
-  n = sigma*randn(1,Nsam);
-  % printf("SNR3kdB: %f SNR4kdB: %f N: %f %f\n", SNR3kdB, SNR4kdB, N, n*n');
-  rx_real += n;
-  % check our sums are OK to within 0.25 dB
-  SNR4kdB_measured = 10*log10(S/(n*n')); 
-  assert (abs(SNR4kdB - SNR4kdB_measured) < 0.5);
-  if verbose
-    printf("foff: %3.1f Hz SNR(3k): %3.1f dB  ", freq_offset_Hz, SNR3kdB);
-    printf("measSNR3k: %3.2f dB N: %3.2f dB\n",
-           10*log10(S/(n*n')) + 10*log10(4000) - 10*log10(3000), 10*log10(n*n'));
-  end
-endfunction

third_party/codec2/octave/cohpsk_demod_plot.m

@@ -1,69 +0,0 @@
-% cohpsk_demod_plot.m
-% David Rowe May 2015
-%
-% Plot Octave outputs from cohpsk_demod, c2dec, to visualise what's going on
-% when errors hit the system
-
-#{
-   $ ./cohpsk_get_test_bits - 5600 | ./cohpsk_mod - - | ./ch - - --No -40 | ./cohpsk_demod - - -o cohpsk_demod.txt | ./cohpsk_put_test_bits -
-   octave> cohpsk_demod_plot("../build_linux/src/cohpsk_demod.txt")
-#}
-   
-function cohpsk_demod_plot(fn)
-  Nc=7; Nd=2; Ns=6;
-
-  load(fn);
-
-  Ncf = 100;     % number of codec frames to plot
-  Nmf = Ncf/2;  % number of modem frames to plot
-  Nms = Nmf*Ns; % number of modem symbols to plot
-
-  figure(1)
-  clf;
-
-  % plot combined signals to show diversity gains
-
-  combined = rx_symb_log_c(:,1:Nc);
-  for d=2:Nd
-    combined += rx_symb_log_c(:, (d-1)*Nc+1:d*Nc);
-  end
-  plot(combined*exp(j*pi/4)/sqrt(Nd),'+')
-  title('Scatter');
-  axis([-2 2 -2 2])
-
-  figure(2)
-  clf;
-  subplot(211)
-  plot(rx_phi_log_c(1:Nms,:))
-  title('phase')
-  axis([1 Nms -pi pi])
-  subplot(212)
-  plot(rx_amp_log_c(1:Nms,:))
-  title('amplitude')
-  axis([1 Nms 0 1])
-
-  figure(3)
-  subplot(211)
-  plot(rx_timing_log_c)
-  title('rx timing');
-  subplot(212)
-  stem(ratio_log_c)
-  title('Sync ratio');
-
-  figure(4)
-  plot(f_est_log_c - 1500)
-  title('freq offset est');
-  axis([1 Nmf -50 50])
-
-  figure(5)
-  y = 1:Nms;
-  x = 1:Nc*Nd;
-  z = 20*log10(rx_amp_log_c(1:Nms,:));
-  mesh(x,y,z);
-  grid
-  title('Channel Amplitude dB');
-  a = min(min(z));
-  b = max(max(z));
-  axis([1 Nc*Nd 1 Nms a b])
-end
-

third_party/codec2/octave/cohpsk_dev.m

@@ -1,439 +0,0 @@
-% cohpsk_dev.m
-% David Rowe Mar 2015
-%
-% Coherent PSK modem development and testing functions
-%
-
-cohpsk_lib;
-
-% Init HF channel model from stored sample files of spreading signal ----------------------------------
-
-function [spread spread_2ms hf_gain] = init_hf_model(Fs, nsam)
-
-    % convert "spreading" samples from 1kHz carrier at Fss to complex
-    % baseband, generated by passing a 1kHz sine wave through PathSim
-    % with the ccir-poor model, enabling one path at a time.
-    
-    Fc = 1000; Fss = 8000;
-    fspread = fopen("../raw/sine1k_2Hz_spread.raw","rb");
-    spread1k = fread(fspread, "int16")/10000;
-    fclose(fspread);
-    fspread = fopen("../raw/sine1k_2ms_delay_2Hz_spread.raw","rb");
-    spread1k_2ms = fread(fspread, "int16")/10000;
-    fclose(fspread);
-
-    % down convert to complex baseband
-    spreadbb = spread1k.*exp(-j*(2*pi*Fc/Fss)*(1:length(spread1k))');
-    spreadbb_2ms = spread1k_2ms.*exp(-j*(2*pi*Fc/Fss)*(1:length(spread1k_2ms))');
-
-    % remove -2000 Hz image
-    b = fir1(50, 5/Fss);
-    spread = filter(b,1,spreadbb);
-    spread_2ms = filter(b,1,spreadbb_2ms);
-   
-    % discard first 1000 samples as these were near 0, probably as
-    % PathSim states were ramping up
-
-    spread    = spread(1000:length(spread));
-    spread_2ms = spread_2ms(1000:length(spread_2ms));
-
-    % change output samples so they are at rate Fs reqd by caller
-    
-    spread = resample(spread, Fs, Fss);
-    spread_2ms = resample(spread_2ms, Fs, Fss);
-
-    % Determine "gain" of HF channel model, so we can normalise
-    % carrier power during HF channel sim to calibrate SNR.  I imagine
-    % different implementations of ccir-poor would do this in
-    % different ways, leading to different BER results.  Oh Well!
-
-    hf_gain = 1.0/sqrt(var(spread(1:nsam))+var(spread_2ms(1:nsam)));
-endfunction
-
-
-function write_pilot_file(pilot, Nsymbrowpilot, Ns, Nsymrow, Npilotsframe, Nc);
-
-  filename = sprintf("../src/cohpsk_defs.h", Npilotsframe, Nc);
-  f=fopen(filename,"wt");
-  fprintf(f,"/* Generated by write_pilot_file() Octave function */\n\n");
-  fprintf(f,"#define NSYMROW      %d   /* number of data symbols on each row (i.e. each carrier) */\n", Nsymrow);
-  fprintf(f,"#define NS           %d   /* number of data symbols between pilots                   */\n", Ns);
-  fprintf(f,"#define NPILOTSFRAME %d   /* number of pilot symbols on each row                     */\n", Npilotsframe);
-  fprintf(f,"#define PILOTS_NC    %d   /* number of carriers                                      */\n\n", Nc);
-  fprintf(f,"#define NSYMROWPILOT %d   /* length of row after pilots inserted                     */\n\n", Nsymbrowpilot);
-  fclose(f);
-
-  filename = sprintf("../src/pilots_coh.h", Npilotsframe, Nc);
-  f=fopen(filename,"wt");
-  fprintf(f,"/* Generated by write_pilot_file() Octave function */\n\n");
-  fprintf(f,"float pilots_coh[][PILOTS_NC]={\n");
-  for r=1:Npilotsframe
-    fprintf(f, "  {");
-    for c=1:Nc-1
-      fprintf(f, "  %f,", pilot(r, c));
-    end
-    if r < Npilotsframe
-      fprintf(f, "  %f},\n", pilot(r, Nc));
-    else
-      fprintf(f, "  %f}\n};", pilot(r, Nc));
-    end
-  end
-  fclose(f);
-endfunction
-
-
-% Save test bits frame to a text file in the form of a C array
-
-function test_bits_coh_file(test_bits_coh)
-
-  f=fopen("../src/test_bits_coh.h","wt");
-  fprintf(f,"/* Generated by test_bits_coh_file() Octave function */\n\n");
-  fprintf(f,"const int test_bits_coh[]={\n");
-  for m=1:length(test_bits_coh)-1
-    fprintf(f,"  %d,\n",test_bits_coh(m));
-  endfor
-  fprintf(f,"  %d\n};\n",test_bits_coh(length(test_bits_coh)));
-  fclose(f);
-
-endfunction
-
-
-% Rate Rs BER tests ------------------------------------------------------------------------------
-
-function sim_out = ber_test(sim_in)
-    sim_in = symbol_rate_init(sim_in);
-
-    Fs               = sim_in.Fs;
-    Rs               = sim_in.Rs;
-    Ntrials          = sim_in.Ntrials;
-    verbose          = sim_in.verbose;
-    plot_scatter     = sim_in.plot_scatter;
-    framesize        = sim_in.framesize;
-    bps              = sim_in.bps;
-
-    Esvec            = sim_in.Esvec;
-    ldpc_code        = sim_in.ldpc_code;
-    rate             = sim_in.ldpc_code_rate;
-    code_param       = sim_in.code_param;
-    tx_bits_buf      = sim_in.tx_bits_buf;
-    Nsymb            = sim_in.Nsymb;
-    Nsymbrow         = sim_in.Nsymbrow;
-    Nsymbrowpilot    = sim_in.Nsymbrowpilot;
-    Nc               = sim_in.Nc;
-    Npilotsframe     = sim_in.Npilotsframe;
-    Ns               = sim_in.Ns;
-    Np               = sim_in.Np;
-    Nd               = sim_in.Nd;
-    modulation       = sim_in.modulation;
-    pilot            = sim_in.pilot;
-    prev_sym_tx      = sim_in.prev_sym_tx;
-    prev_sym_rx      = sim_in.prev_sym_rx;
-    rx_symb_buf      = sim_in.rx_symb_buf;
-    tx_pilot_buf     = sim_in.tx_pilot_buf;
-    rx_pilot_buf     = sim_in.rx_pilot_buf;
-
-    hf_sim           = sim_in.hf_sim;
-    nhfdelay         = sim_in.hf_delay_ms*Rs/1000;
-    hf_mag_only      = sim_in.hf_mag_only;
-    f_off            = sim_in.f_off;
-    div_time_shift   = sim_in.div_timeshift;
-
-    [spread spread_2ms hf_gain] = init_hf_model(Rs, Nsymbrowpilot*(Ntrials+2));
-
-    if strcmp(modulation,'dqpsk')
-      Nsymbrowpilot = Nsymbrow;
-    end
-
-    % Start Simulation ----------------------------------------------------------------
-
-    for ne = 1:length(Esvec)
-        EsNodB = Esvec(ne);
-        EsNo = 10^(EsNodB/10);
-    
-        variance = 1/EsNo;
-        if verbose > 1
-            printf("EsNo (dB): %f EsNo: %f variance: %f\n", EsNodB, EsNo, variance);
-        end
-        
-        Terrs = 0;  Tbits = 0;
-
-        s_ch_tx_log      = [];
-        rx_symb_log      = [];
-        noise_log        = [];
-        errors_log       = [];
-        Nerrs_log        = [];
-        phi_log          = [];
-        amp_log          = [];
-        EsNo__log        = [];
-
-        ldpc_errors_log = []; ldpc_Nerrs_log = [];
-
-        Terrsldpc = Tbitsldpc = Ferrsldpc = 0;
-
-        % init HF channel
-
-        hf_n = 1;
-
-        phase_offset_rect = 1;
-        w_offset      = 2*pi*f_off/Rs;
-        w_offset_rect = exp(j*w_offset);
-
-        ct_symb_buf = zeros(2*Nsymbrowpilot, Nc*Nd);
-        prev_tx_symb = prev_rx_symb = ones(1, Nc*Nd);
-
-        % simulation starts here-----------------------------------
- 
-        for nn = 1:Ntrials+2
-                  
-            if ldpc_code
-              tx_bits = round(rand(1,framesize*rate));                       
-            else
-              tx_bits = round(rand(1,framesize));                       
-            end
-
-            if strcmp(modulation,'qpsk')
-              [tx_symb tx_bits] = bits_to_qpsk_symbols(sim_in, tx_bits, code_param);
-
-              % one frame delay on bits for qpsk
-
-              tx_bits_buf(1:framesize) = tx_bits_buf(framesize+1:2*framesize);
-              tx_bits_buf(framesize+1:2*framesize) = tx_bits;
-
-            end
-            if strcmp(modulation, 'dqpsk')
-              [tx_symb prev_tx_symb] = bits_to_dqpsk_symbols(sim_in, tx_bits, prev_tx_symb);
-              tx_bits_buf(1:framesize) = tx_bits;
-            end
-
-            s_ch = tx_symb;
-
-            % HF channel simulation  ------------------------------------
-            
-            hf_fading = ones(1,Nsymb);
-            if hf_sim
-
-                % separation between carriers.  Note this effectively
-                % under samples at Rs, I dont think this matters.
-                % Equivalent to doing freq shift at Fs, then
-                % decimating to Rs.
-
-                wsep = 2*pi*(1+0.5);  % e.g. 75Hz spacing at Rs=50Hz, alpha=0.5 filters
-
-                hf_model(hf_n, :) = zeros(1,Nc*Nd);
-                
-                for r=1:Nsymbrowpilot
-                  for c=1:Nd*Nc
-                    if c > Nc 
-                      time_shift = sim_in.div_timeshift;
-                    else
-                      time_shift = 1;
-                    end
-                    ahf_model = hf_gain*(spread(hf_n+time_shift) + exp(-j*c*wsep*nhfdelay)*spread_2ms(hf_n+time_shift));
-                    
-                    if hf_mag_only
-                      s_ch(r,c) *= abs(ahf_model);
-                    else
-                      s_ch(r,c) *= ahf_model;
-                    end
-                    hf_model(hf_n, c) = ahf_model;
-                  end
-                  hf_n++;
-                end
-            end
-           
-            % keep a record of each tx symbol so we can check average power
-
-            for r=1:Nsymbrow
-              for c=1:Nd*Nc
-                 s_ch_tx_log = [s_ch_tx_log s_ch(r,c)];
-              end
-            end
-
-            % AWGN noise and phase/freq offset channel simulation
-            % 0.5 factor ensures var(noise) == variance , i.e. splits power between Re & Im
-
-            noise = sqrt(variance*0.5)*(randn(Nsymbrowpilot,Nc*Nd) + j*randn(Nsymbrowpilot,Nc*Nd));
-            noise_log = [noise_log noise];
-
-            for r=1:Nsymbrowpilot
-              s_ch(r,:) *= phase_offset_rect;
-              phase_offset_rect *= w_offset_rect;
-            end
-            s_ch += noise;
-
-            ct_symb_buf(1:Nsymbrowpilot,:) = ct_symb_buf(Nsymbrowpilot+1:2*Nsymbrowpilot,:);
-            ct_symb_buf(Nsymbrowpilot+1:2*Nsymbrowpilot,:) = s_ch;
-
-            if strcmp(modulation,'qpsk')
-              [rx_symb rx_bits rx_symb_linear amp_ phi_ sig_rms noise_rms sim_in] = qpsk_symbols_to_bits(sim_in, ct_symb_buf(1:Nsymbrowpilot+Npilotsframe,:));                                 
-              phi_log = [phi_log; phi_];
-              amp_log = [amp_log; amp_];
-            end
-            if strcmp(modulation,'dqpsk')
-              [rx_symb rx_bits rx_symb_linear prev_rx_symb] = dqpsk_symbols_to_bits(sim_in, s_ch, prev_rx_symb);                                 
-            end
-                        
-            % Wait until we have enough frames to do pilot assisted phase estimation
-
-            if nn > 1
-              rx_symb_log = [rx_symb_log rx_symb_linear];
-              %EsNo__log = [EsNo__log EsNo_];
-
-              % Measure BER
-
-              error_positions = xor(rx_bits, tx_bits_buf(1:framesize));
-              Nerrs = sum(error_positions);
-              Terrs += Nerrs;
-              Tbits += length(tx_bits);
-              errors_log = [errors_log error_positions];
-              Nerrs_log = [Nerrs_log Nerrs];
-
-              % Optionally LDPC decode
-            
-              if ldpc_code
-                detected_data = ldpc_dec(code_param, sim_in.max_iterations, sim_in.demod_type, sim_in.decoder_type, ...
-                                         rx_symb_linear, min(100,EsNo_), amp_linear);
-                error_positions = xor( detected_data(1:framesize*rate), tx_bits_buf(1:framesize*rate) );
-                Nerrs = sum(error_positions);
-                ldpc_Nerrs_log = [ldpc_Nerrs_log Nerrs];
-                ldpc_errors_log = [ldpc_errors_log error_positions];
-                if Nerrs
-                    Ferrsldpc++;
-                end
-                Terrsldpc += Nerrs;
-                Tbitsldpc += framesize*rate;
-              end
-            end
-          end
-           
-          TERvec(ne) = Terrs;
-          BERvec(ne) = Terrs/Tbits;
-
-            if verbose 
-              av_tx_pwr = (s_ch_tx_log * s_ch_tx_log')/length(s_ch_tx_log);
-
-              printf("EsNo (dB): %3.1f Terrs: %d Tbits: %d BER %5.3f QPSK BER theory %5.3f av_tx_pwr: %3.2f",
-                     EsNodB, Terrs, Tbits,
-                       Terrs/Tbits, 0.5*erfc(sqrt(EsNo/2)), av_tx_pwr);
-              if ldpc_code
-                  printf("\n LDPC: Terrs: %d BER: %4.2f Ferrs: %d FER: %4.2f", 
-                         Terrsldpc, Terrsldpc/Tbitsldpc, Ferrsldpc, Ferrsldpc/Ntrials);
-              end
-              printf("\n");
-            end
-    end
-    
-    Ebvec = Esvec - 10*log10(bps);
-    sim_out.BERvec          = BERvec;
-    sim_out.Ebvec           = Ebvec;
-    sim_out.TERvec          = TERvec;
-    sim_out.errors_log      = errors_log;
-    sim_out.ldpc_errors_log = ldpc_errors_log;
-
-    if plot_scatter
-        figure(2);
-        clf;
-        scat = rx_symb_log .* exp(j*pi/4);
-        plot(real(scat), imag(scat),'+');
-        title('Scatter plot');
-        a = 1.5*max(real(scat)); b = 1.5*max(imag(scat));
-        axis([-a a -b b]);
-
-        if hf_sim
-          figure(3);
-          clf;
-        
-          y = 1:(hf_n-1);
-          x = 1:Nc*Nd;
-          EsNodBSurface = 20*log10(abs(hf_model(y,:))) - 10*log10(variance);
-          EsNodBSurface(find(EsNodBSurface < -5)) = -5;
-          EsNodBSurface(find(EsNodBSurface > 25)) = 25;
-          mesh(x,y,EsNodBSurface);
-          grid
-          axis([1 Nc*Nd 1 Rs*5 -5 25])
-          title('HF Channel Es/No');
-
-          if verbose 
-            [m n] = size(hf_model);
-            av_hf_pwr = sum(sum(abs(hf_model(:,:)).^2))/(m*n);
-            printf("average HF power: %3.2f over %d symbols\n", av_hf_pwr, m*n);
-          end
-
-       end
-
-       if strcmp(modulation,'qpsk')
-          % set up time axis to include gaps for pilots
-
-         [m1 n1] = size(phi_log);
-         phi_x = [];
-         phi_x_counter = 1;
-         p = Ns;
-         for r=1:m1
-           if p == Ns
-             phi_x_counter += Npilotsframe;
-             p = 0;
-           end
-           p++;
-           phi_x = [phi_x phi_x_counter++];        
-         end
-
-         phi_x -= Nsymbrowpilot; % account for delay in pilot buffer
-
-         figure(5);
-         clf
-         subplot(211)
-         [m n] = size(phi_log);
-         plot(phi_x, phi_log(:,2),'r+;Estimated HF channel phase;')
-         if hf_sim
-           hold on;
-           [m n] = size(hf_model);
-           plot(angle(hf_model(1:m,2)),'g;HF channel phase;')
-           hold off;
-         end
-         ylabel('Phase (rads)');
-         legend('boxoff');
-         axis([1 m -1.1*pi 1.1*pi])
-
-         subplot(212)
-         plot(phi_x, amp_log(:,2),'r+;Estimated HF channel amp;')
-         if hf_sim
-           hold on;
-           plot(abs(hf_model(1:m,2)))
-           hold off;
-         end
-         ylabel('Amplitude');
-         xlabel('Time (symbols)');
-         legend('boxoff');
-         axis([1 m 0 3])
-       end
-
-       figure(4)
-       clf
-       stem(Nerrs_log)
-       axis([1 length(Nerrs_log) 0 max(Nerrs_log)+1])
-   end
-
-endfunction
-
-function sim_in = standard_init
-  sim_in.verbose          = 1;
-  sim_in.do_write_pilot_file = 0;
-  sim_in.plot_scatter     = 0;
-
-  sim_in.Esvec            = 50; 
-  sim_in.Ntrials          = 30;
-  sim_in.framesize        = 2;
-  sim_in.Rs               = 50;
-
-  sim_in.phase_offset     = 0;
-  sim_in.w_offset         = 0;
-  sim_in.phase_noise_amp  = 0;
-
-  sim_in.hf_delay_ms      = 2;
-  sim_in.hf_sim           = 0;
-  sim_in.hf_mag_only      = 0;
-
-  sim_in.Nd            = 1;
-endfunction
-
-

third_party/codec2/octave/cohpsk_lib.m

@@ -1,509 +0,0 @@
-% cohpsk_lib.m
-% David Rowe Mar 2015
-%
-% Coherent PSK modem functions
-%
-
-1;
-
-% Gray coded QPSK modulation function
-
-function symbol = qpsk_mod(two_bits)
-    two_bits_decimal = sum(two_bits .* [2 1]); 
-    switch(two_bits_decimal)
-        case (0) symbol =  1;
-        case (1) symbol =  j;
-        case (2) symbol = -j;
-        case (3) symbol = -1;
-    endswitch
-endfunction
-
-
-% Gray coded QPSK demodulation function
-
-function two_bits = qpsk_demod(symbol)
-    if isscalar(symbol) == 0
-        printf("only works with scalars\n");
-        return;
-    end
-    bit0 = real(symbol*exp(j*pi/4)) < 0;
-    bit1 = imag(symbol*exp(j*pi/4)) < 0;
-    two_bits = [bit1 bit0];
-endfunction
-
-% init function for symbol rate processing --------------------------------------------------------
-
-function sim_in = symbol_rate_init(sim_in)
-    sim_in.Fs = Fs = 8000;
-
-    modulation       = sim_in.modulation;
-    verbose          = sim_in.verbose;
-    framesize        = sim_in.framesize;
-    Ntrials          = sim_in.Ntrials;
-    Esvec            = sim_in.Esvec;
-    phase_offset     = sim_in.phase_offset;
-    w_offset         = sim_in.w_offset;
-    plot_scatter     = sim_in.plot_scatter;
-
-    Rs               = sim_in.Rs;
-    Nc               = sim_in.Nc;
-
-    hf_sim           = sim_in.hf_sim;
-    nhfdelay         = sim_in.hf_delay_ms*Rs/1000;
-    hf_mag_only      = sim_in.hf_mag_only;
-
-    Nd               = sim_in.Nd;     % diveristy
-    Ns               = sim_in.Ns;     % step size between pilots
-    ldpc_code        = sim_in.ldpc_code;
-    rate             = sim_in.ldpc_code_rate; 
-
-    sim_in.bps = bps = 2;
-
-    sim_in.Nsymb         = Nsymb            = framesize/bps;
-    sim_in.Nsymbrow      = Nsymbrow         = Nsymb/Nc;
-    sim_in.Npilotsframe  = Npilotsframe     = 2;
-    sim_in.Nsymbrowpilot = Nsymbrowpilot    = Nsymbrow + Npilotsframe;
-    
-    if verbose == 2
-      printf("Each frame contains %d data bits or %d data symbols, transmitted as %d symbols by %d carriers.", framesize, Nsymb, Nsymbrow, Nc);
-      printf("  There are %d pilot symbols in each carrier together at the start of each frame, then %d data symbols.", Npilotsframe, Ns); 
-      printf("  Including pilots, the frame is %d symbols long by %d carriers.\n\n", Nsymbrowpilot, Nc);
-    end
-
-    sim_in.prev_sym_tx = qpsk_mod([0 0])*ones(1,Nc*Nd);
-    sim_in.prev_sym_rx = qpsk_mod([0 0])*ones(1,Nc*Nd);
-
-    sim_in.rx_symb_buf  = zeros(3*Nsymbrow, Nc*Nd);
-    sim_in.rx_pilot_buf = zeros(3*Npilotsframe,Nc*Nd);
-    sim_in.tx_bits_buf  = zeros(1,2*framesize);
-
-    % pilot sequence is used for phase and amplitude estimation, and frame sync
-
-    pilot = 1 - 2*(rand(Npilotsframe,Nc) > 0.5);
-    sim_in.pilot = pilot;
-    sim_in.tx_pilot_buf = [pilot; pilot; pilot];
-
-    if sim_in.do_write_pilot_file
-      write_pilot_file(pilot, Nsymbrowpilot, Ns, Nsymbrow, Npilotsframe, Nc);
-    end
-
-    % we use first 2 pilots of next frame to help with frame sync and fine freq
-
-    sim_in.Nct_sym_buf = 2*Nsymbrowpilot + 2;
-    sim_in.ct_symb_buf = zeros(sim_in.Nct_sym_buf, Nc*Nd);
-
-    sim_in.ff_phase = 1;
-
-    sim_in.ct_symb_ff_buf = zeros(Nsymbrowpilot + 2, Nc*Nd);
-
-    % Init LDPC --------------------------------------------------------------------
-
-    if ldpc_code
-        % Start CML library
-
-        currentdir = pwd;
-        addpath '~/cml/mat'    % assume the source files stored here
-        cd ~/cml
-        CmlStartup             % note that this is not in the cml path!
-        cd(currentdir)
-  
-        % Our LDPC library
-
-        ldpc;
-
-        mod_order = 4; 
-        modulation2 = 'QPSK';
-        mapping = 'gray';
-
-        sim_in.demod_type = 0;
-        sim_in.decoder_type = 0;
-        sim_in.max_iterations = 100;
-
-        code_param = ldpc_init(rate, framesize, modulation2, mod_order, mapping);
-        code_param.code_bits_per_frame = framesize;
-        code_param.symbols_per_frame = framesize/bps;
-        sim_in.code_param = code_param;
-    else
-        sim_in.rate = 1;
-        sim_in.code_param = [];
-    end
-endfunction
-
-
-% Symbol rate processing for tx side (modulator) -------------------------------------------------------
-
-% legacy DQPSK mod for comparative testing
-
-function [tx_symb prev_tx_symb] = bits_to_dqpsk_symbols(sim_in, tx_bits, prev_tx_symb)
-    Nc         = sim_in.Nc;
-    Nsymbrow   = sim_in.Nsymbrow;
-
-    tx_symb = zeros(Nsymbrow,Nc);
-
-    for c=1:Nc
-      for r=1:Nsymbrow
-        i = (c-1)*Nsymbrow + r;
-        tx_symb(r,c) = qpsk_mod(tx_bits(2*(i-1)+1:2*i));  
-        tx_symb(r,c) *= prev_tx_symb(c);
-        prev_tx_symb(c) = tx_symb(r,c);
-      end
-    end
-              
-endfunction
-
-
-% legacy DQPSK demod for comparative testing
-
-function [rx_symb rx_bits rx_symb_linear prev_rx_symb] = dqpsk_symbols_to_bits(sim_in, rx_symb, prev_rx_symb)
-    Nc         = sim_in.Nc;
-    Nsymbrow   = sim_in.Nsymbrow;
-
-    tx_symb = zeros(Nsymbrow,Nc);
-
-    for c=1:Nc
-      for r=1:Nsymbrow
-        tmp = rx_symb(r,c);
-        rx_symb(r,c) *= conj(prev_rx_symb(c))/abs(prev_rx_symb(c));
-        prev_rx_symb(c) = tmp;
-        i = (c-1)*Nsymbrow + r;
-        rx_symb_linear(i) = rx_symb(r,c);
-        rx_bits((2*(i-1)+1):(2*i)) = qpsk_demod(rx_symb(r,c));
-      end
-    end 
-              
-endfunction
-
-
-function [tx_symb tx_bits] = bits_to_qpsk_symbols(sim_in, tx_bits, code_param)
-    ldpc_code     = sim_in.ldpc_code;
-    rate          = sim_in.ldpc_code_rate;
-    framesize     = sim_in.framesize;
-    Nsymbrow      = sim_in.Nsymbrow;
-    Nsymbrowpilot = sim_in.Nsymbrowpilot;
-    Nc            = sim_in.Nc;
-    Npilotsframe  = sim_in.Npilotsframe;
-    Ns            = sim_in.Ns;
-    modulation    = sim_in.modulation;
-    pilot         = sim_in.pilot;
-    Nd            = sim_in.Nd;
-
-    if ldpc_code
-        [tx_bits, tmp] = ldpc_enc(tx_bits, code_param);
-    end
-
-    % modulate --------------------------------------------
-
-    % organise symbols into a Nsymbrow rows by Nc cols
-    % data and parity bits are on separate carriers
-
-    tx_symb = zeros(Nsymbrow,Nc);
-    
-    for c=1:Nc
-      for r=1:Nsymbrow
-        i = (c-1)*Nsymbrow + r;
-        tx_symb(r,c) = qpsk_mod(tx_bits(2*(i-1)+1:2*i));
-      end
-    end
-    
-    % insert pilots at start of frame
-    
-    tx_symb = [pilot(1,:); pilot(2,:); tx_symb;];
-
-    % copy to other carriers (diversity)
-
-    tmp = tx_symb;
-    for d=1:Nd-1
-      tmp = [tmp tx_symb];
-    end
-    tx_symb = tmp;
-
-    % ensures energy/symbol is normalised with diversity
-
-    tx_symb = tx_symb/sqrt(Nd);
-endfunction
-
-
-% Symbol rate processing for rx side (demodulator) -------------------------------------------------------
-
-function [rx_symb rx_bits rx_symb_linear amp_ phi_ sig_rms noise_rms cohpsk] = qpsk_symbols_to_bits(cohpsk, ct_symb_buf)
-    framesize     = cohpsk.framesize;
-    Nsymb         = cohpsk.Nsymb;
-    Nsymbrow      = cohpsk.Nsymbrow;
-    Nsymbrowpilot = cohpsk.Nsymbrowpilot;
-    Nc            = cohpsk.Nc;
-    Nd            = cohpsk.Nd;
-    Npilotsframe  = cohpsk.Npilotsframe;
-    pilot         = cohpsk.pilot;
-    verbose       = cohpsk.verbose;
-    coh_en        = cohpsk.coh_en;
-
-    % Use pilots to get phase and amplitude estimates We assume there
-    % are two samples at the start of each frame and two at the end
-    % Note: correlation (averging) method was used initially, but was
-    % poor at tracking fast phase changes that we experience on fading
-    % channels.  Linear regression (fitting a straight line) works
-    % better on fading channels, but increases BER slightly for AWGN
-    % channels.
-
-    sampling_points = [1 2 cohpsk.Nsymbrow+3 cohpsk.Nsymbrow+4];
-    pilot2 = [cohpsk.pilot(1,:); cohpsk.pilot(2,:); cohpsk.pilot(1,:); cohpsk.pilot(2,:);];
-    phi_ = zeros(Nsymbrow, Nc*Nd);
-    amp_ = zeros(Nsymbrow, Nc*Nd);
-    
-    for c=1:Nc*Nd
-      y = ct_symb_buf(sampling_points,c) .* pilot2(:,c-Nc*floor((c-1)/Nc));
-      [m b] = linreg(sampling_points, y, length(sampling_points));
-      yfit = m*[3 4 5 6] + b;
-      phi_(:, c) = angle(yfit);
-
-      mag  = sum(abs(ct_symb_buf(sampling_points,c)));
-      amp_(:, c) = mag/length(sampling_points);
-    end
-
-    % now correct phase of data symbols
-
-    rx_symb = zeros(Nsymbrow, Nc);
-    rx_symb_linear = zeros(1, Nsymbrow*Nc*Nd);
-    rx_bits = zeros(1, framesize);
-    for c=1:Nc*Nd
-      for r=1:Nsymbrow
-        if coh_en == 1
-          rx_symb(r,c) = ct_symb_buf(2+r,c)*exp(-j*phi_(r,c));
-        else
-          rx_symb(r,c) = ct_symb_buf(2+r,c);
-        end
-        i = (c-1)*Nsymbrow + r;
-        rx_symb_linear(i) = rx_symb(r,c);
-      end
-    end
-
-    % and finally optional diversity combination and make decn on bits
-
-    for c=1:Nc
-      for r=1:Nsymbrow
-        i = (c-1)*Nsymbrow + r;
-        div_symb = rx_symb(r,c);
-        for d=1:Nd-1
-          div_symb += rx_symb(r,c + Nc*d);
-        end
-        rx_bits((2*(i-1)+1):(2*i)) = qpsk_demod(div_symb);
-      end
-    end
-
-    % Estimate noise power from demodulated symbols.  One method is to
-    % calculate the distance of each symbol from the average symbol
-    % position. However this is complicated by fading, which means the
-    % amplitude of the symbols is constantly changing.
-    
-    % Now the scatter diagram in a fading channel is a X or cross
-    % shape.  The noise can be resolved into two components at right
-    % angles to each other.  The component along the the "thickness"
-    % of the arms is proportional to the noise power and not affected
-    % by fading.  We only use points further along the real axis than
-    % the mean amplitude so we keep out of the central nosiey blob
-        
-    sig_rms = mean(abs(rx_symb_linear));
-   
-    sum_x = 0;
-    sum_xx = 0;
-    n = 0;
-    for i=1:Nsymb*Nd
-      s = rx_symb_linear(i);
-      if abs(real(s)) > sig_rms
-        sum_x  += imag(s);
-        sum_xx += imag(s)*imag(s);
-        n++;
-      end
-    end
-   
-    noise_var = 0;
-    if n > 1
-      noise_var = (n*sum_xx - sum_x*sum_x)/(n*(n-1));
-    end
-    noise_rms = sqrt(noise_var);
-endfunction
-
-function [ch_symb rx_timing rx_filt rx_baseband afdmdv f_est] = rate_Fs_rx_processing(afdmdv, ch_fdm_frame, f_est, nsymb, nin, freq_track)
-    M = afdmdv.M;
-    
-    rx_baseband = [];
-    rx_filt = [];
-    rx_timing = [];
-
-    ch_fdm_frame_index = 1;
-
-    for r=1:nsymb
-      % shift signal to nominal baseband, this will put Nc/2 carriers either side of 0 Hz
-
-      [rx_fdm_frame_bb afdmdv.fbb_phase_rx] = freq_shift(ch_fdm_frame(ch_fdm_frame_index:ch_fdm_frame_index + nin - 1), -f_est, afdmdv.Fs, afdmdv.fbb_phase_rx);
-      ch_fdm_frame_index += nin;
-
-      % downconvert each FDM carrier to Nc separate baseband signals
-
-      [arx_baseband afdmdv]             = fdm_downconvert(afdmdv, rx_fdm_frame_bb, nin);
-      [arx_filt afdmdv]                 = rx_filter(afdmdv, arx_baseband, nin);
-      [rx_onesym arx_timing env afdmdv] = rx_est_timing(afdmdv, arx_filt, nin);     
-
-      rx_baseband = [rx_baseband arx_baseband];
-      rx_filt     = [rx_filt arx_filt];
-      rx_timing    = [rx_timing arx_timing];
-      
-      ch_symb(r,:) = rx_onesym;
-
-      % we only allow a timing shift on one symbol per frame
-
-      if nin != M
-        nin = M;
-      end
-
-      % freq tracking, see test_ftrack.m for unit test.  Placed in
-      % this function as it needs to work on a symbol by symbol basis
-      % rather than frame by frame.  This means the control loop
-      % operates at a sample rate of Rs = 50Hz for say 1 Hz/s drift.
-
-      if freq_track
-        beta = 0.005;
-        g = 0.2;
-
-        % combine difference on phase from last symbol over Nc carriers
-
-        mod_strip = 0;
-        for c=1:afdmdv.Nc+1
-          adiff = rx_onesym(c) .* conj(afdmdv.prev_rx_symb(c));
-          afdmdv.prev_rx_symb(c) = rx_onesym(c);
-
-          % 4th power strips QPSK modulation, by multiplying phase by 4
-          % Using the abs value of the real coord was found to help 
-          % non-linear issues when noise power was large
-
-          amod_strip = adiff.^4;
-          amod_strip = abs(real(amod_strip)) + j*imag(amod_strip);
-          mod_strip += amod_strip;
-        end
-
-        % loop filter made up of 1st order IIR plus integrator.  Integerator
-        % was found to be reqd 
-        
-        afdmdv.filt = (1-beta)*afdmdv.filt + beta*angle(mod_strip);
-        f_est += g*afdmdv.filt;
-      end
-    end
-endfunction
-
-
-function ct_symb_buf = update_ct_symb_buf(ct_symb_buf, ch_symb, Nct_sym_buf, Nsymbrowpilot)
-
-  % update memory in symbol buffer
-
-  for r=1:Nct_sym_buf-Nsymbrowpilot
-    ct_symb_buf(r,:) = ct_symb_buf(r+Nsymbrowpilot,:);
-  end
-  i = 1;
-  for r=Nct_sym_buf-Nsymbrowpilot+1:Nct_sym_buf
-    ct_symb_buf(r,:) = ch_symb(i,:);
-    i++;
-  end
-endfunction
-
-
-% returns index of start of frame and fine freq offset
-
-function [next_sync cohpsk] = frame_sync_fine_freq_est(cohpsk, ch_symb, sync, next_sync)
-  ct_symb_buf   = cohpsk.ct_symb_buf;
-  Nct_sym_buf   = cohpsk.Nct_sym_buf;
-  Rs            = cohpsk.Rs;
-  Nsymbrowpilot = cohpsk.Nsymbrowpilot;
-  Nc            = cohpsk.Nc;
-  Nd            = cohpsk.Nd;
-
-  ct_symb_buf = update_ct_symb_buf(ct_symb_buf, ch_symb, Nct_sym_buf, Nsymbrowpilot);
-  cohpsk.ct_symb_buf = ct_symb_buf;
- 
-  % sample pilots at start of this frame and start of next frame 
-
-  sampling_points = [1 2 cohpsk.Nsymbrow+3 cohpsk.Nsymbrow+4];
-  pilot2 = [ cohpsk.pilot(1,:); cohpsk.pilot(2,:); cohpsk.pilot(1,:); cohpsk.pilot(2,:);];
-
-  if sync == 0
-
-    % sample correlation over 2D grid of time and fine freq points
-
-    max_corr = 0;
-    for f_fine=-20:0.25:20
-      f_fine_rect = exp(-j*f_fine*2*pi*sampling_points/Rs)'; % note: this could be pre-computed at init or compile time
-      for t=0:cohpsk.Nsymbrowpilot-1
-        corr = 0; mag = 0;
-        for c=1:Nc*Nd
-          f_corr_vec = f_fine_rect .* ct_symb_buf(t+sampling_points,c); % note: this could be pre-computed at init or compile time
-          acorr = 0.0;
-          for p=1:length(sampling_points)
-            acorr += pilot2(p,c-Nc*floor((c-1)/Nc)) * f_corr_vec(p);
-            mag   += abs(f_corr_vec(p));
-          end
-          corr += abs(acorr);
-        end
-
-        if corr >= max_corr
-          max_corr = corr;
-          max_mag = mag;
-          cohpsk.ct = t;
-          cohpsk.f_fine_est = f_fine;
-          cohpsk.ff_rect = exp(-j*f_fine*2*pi/Rs);
-        end
-      end
-    end
-    
-    printf("  [%d]   fine freq f: %f max_ratio: %f ct: %d\n", cohpsk.frame, cohpsk.f_fine_est, abs(max_corr)/max_mag, cohpsk.ct);
-    if abs(max_corr/max_mag) > 0.9
-      printf("  [%d]   encouraging sync word! ratio: %f\n", cohpsk.frame, abs(max_corr/max_mag));
-      cohpsk.sync_timer = 0;
-      next_sync = 1;
-    else
-      next_sync = 0;
-    end
-    cohpsk.ratio = abs(max_corr/max_mag);
-  end
-  
-  % single point correlation just to see if we are still in sync
-
-  if sync == 1
-    corr = 0; mag = 0;
-    f_fine_rect = exp(-j*cohpsk.f_fine_est*2*pi*sampling_points/Rs)';
-    for c=1:Nc*Nd
-      f_corr_vec = f_fine_rect .* ct_symb_buf(cohpsk.ct+sampling_points,c);
-      acorr = 0;
-      for p=1:length(sampling_points)
-        acorr += pilot2(p, c-Nc*floor((c-1)/Nc)) * f_corr_vec(p);
-        mag  += abs(f_corr_vec(p));
-      end
-      corr += abs(acorr);
-    end
-    cohpsk.ratio = abs(corr)/mag;
-  end
-
-endfunction
-
-
-% misc sync state machine code, just wanted it in a function
-
-function [sync cohpsk] = sync_state_machine(cohpsk, sync, next_sync)
-
-  if sync == 1
-
-    % check that sync is still good, fall out of sync on consecutive bad frames */
-
-    if cohpsk.ratio < 0.8
-      cohpsk.sync_timer++;
-    else
-      cohpsk.sync_timer = 0;            
-    end
-
-    if cohpsk.sync_timer == 10
-      printf("  [%d] lost sync ....\n", cohpsk.frame);
-      next_sync = 0;
-    end
-  end
-
-  sync = next_sync;
-endfunction
-