[Android] Race condition: Native AudioRecord Error -38 and MPEG4Writer instability during record/stop cycle #482

//packages
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:audio_waveforms/audio_waveforms.dart';

//files
//manager
import '../managers/gemini_manager.dart';
import '../prompts/system_prompt_for_transcription.dart';

final descriptionModalViewModelProvider =
    ChangeNotifierProvider.autoDispose<DescriptionModalViewModel>((ref) {
      return DescriptionModalViewModel();
    });

class DescriptionModalViewModel extends ChangeNotifier {
  final RecorderController _recorderController = RecorderController();
  final TextEditingController textController = TextEditingController();
  bool _isListening = false;
  bool _isTrascribing = false;

  String get enteredText => textController.text;
  bool get isListening => _isListening;
  bool get isTrascribing => _isTrascribing;
  RecorderController get recorderController => _recorderController;

  void updateText() {
    notifyListeners();
  }

  Future<void> toggleRecording() async {
    try {
      if (!_isListening) {
        final hasPermission = await _recorderController.checkPermission();
        if (hasPermission) {
          _recorderController.reset();
          await _recorderController.record();
          _isListening = true;
          notifyListeners();
        }
      } else {
        final path = await _recorderController.stop();
        _isListening = false;
        notifyListeners();
        if (path != null) {
          await _transcribeAudio(path);
        } else {
          throw Exception('No file path.');
        }
      }
    } catch (e) {
      print("Recording error: $e");
    }
  }

  Future<void> _transcribeAudio(String filePath) async {
    try {
      _isTrascribing = true;
      notifyListeners();
      final transcription = await GeminiManager().transcribeAudio(
        systemPrompt: systemPromptForTranscription,
        filePath: filePath,
      );
      textController.text = transcription;
    } catch (e) {
      print('$e');
    } finally {
      _isTrascribing = false;
      notifyListeners();
    }
  }

  @override
  void dispose() {
    _recorderController.dispose();
    textController.dispose();
    super.dispose();
  }
}