refactor: used existing AudioJack in soundmeter

[Yugesh-Kumar-S]

Part of #2738

Changes

• Just replaced direct FlutterAudioCapture usage with existing AudioJack class.

Screenshots / Recordings

Checklist:

• No hard coding: I have used resources from strings.xml, dimens.xml and colors.xml without hard coding any value.
• No end of file edits: No modifications done at end of resource files strings.xml, dimens.xml or colors.xml.
• Code reformatting: I have reformatted code and fixed indentation in every file included in this pull request.
• No extra space: My code does not contain any extra lines or extra spaces than the ones that are necessary.

Summary by Sourcery

Refactor SoundMeterStateProvider to leverage the existing AudioJack service for audio capture, replacing direct FlutterAudioCapture usage and streamlining decibel measurement via a polling mechanism.

Enhancements:

• Replace FlutterAudioCapture with the centralized AudioJack class for audio capture in SoundMeterStateProvider
• Start and poll AudioJack on a periodic timer to fetch audio data and update decibel readings
• Change _calculateDecibels to accept a List instead of Float32List
• Introduce a dedicated audio Timer and ensure AudioJack and timers are properly closed in disposeSensors

[sourcery-ai]

Reviewer's Guide

Refactors SoundMeterStateProvider to replace FlutterAudioCapture with the existing AudioJack class, switching to a timer-based polling model for audio sampling, updating decibel calculation to use List, and enhancing resource cleanup logic.

Class diagram for refactored SoundMeterStateProvider audio capture

classDiagram
    class SoundMeterStateProvider {
        - double _currentDb
        - Timer? _timeTimer
        - Timer? _audioTimer
        - List<double> _dbData
        - List<double> _timeData
        - List<FlSpot> dbChartData
        - AudioJack? _audioJack
        - double _startTime
        - double _currentTime
        - int _maxLength
        + void initializeSensors()
        + double _calculateDecibels(List<double> audioData)
        + void disposeSensors()
    }
    class AudioJack {
        + Future<void> initialize()
        + Future<void> start()
        + bool isListening()
        + List<double> read()
        + Future<void> close()
    }
    SoundMeterStateProvider --> AudioJack : uses

Loading

File-Level Changes

Change	Details	Files
Swap out FlutterAudioCapture for AudioJack and switch to polling	Import and instantiate AudioJack instead of FlutterAudioCapture Call initialize() and start() on AudioJack rather than init() on FlutterAudioCapture Remove callback-based start() and related imports	lib/providers/soundmeter_state_provider.dart
Introduce periodic audio polling alongside existing time timer	Add _audioTimer to poll AudioJack every 100ms Check isListening() before reading audio data Update _currentDb and notifyListeners() within polling loop	lib/providers/soundmeter_state_provider.dart
Adjust decibel computation signature	Change _calculateDecibels parameter type from Float32List to List Keep calculation logic but adapt to the new data type	lib/providers/soundmeter_state_provider.dart
Enhance dispose logic for proper cleanup	Call close() on AudioJack in disposeSensors Cancel both _timeTimer and _audioTimer	lib/providers/soundmeter_state_provider.dart

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[sourcery-ai]

Hey @Yugesh-Kumar-S - I've reviewed your changes and they look great!

Prompt for AI Agents

Please address the comments from this code review:
## Individual Comments

### Comment 1
<location> `lib/providers/soundmeter_state_provider.dart:40` </location>
<code_context>
-        sampleRate: 44100,
-        bufferSize: 4096,
-      );
+      _audioTimer = Timer.periodic(const Duration(milliseconds: 100), (timer) {
+        if (_audioJack!.isListening()) {
+          final audioData = _audioJack!.read();
+          if (audioData.isNotEmpty) {
+            _currentDb = _calculateDecibels(audioData);
+            notifyListeners();
</code_context>

<issue_to_address>
Potential for race condition or null dereference with _audioJack usage.

Add null checks or guards to ensure _audioJack is valid and listening before accessing it, especially if initializeSensors or disposeSensors can be called while the timer is active.
</issue_to_address>

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[github-actions]

Build successful. APKs to test: https://github.com/fossasia/pslab-android/actions/runs/15761875662/artifacts/3364467507