pitch_detector_dart 0.0.7

A dart library for pitch detection. It implements the yin algorithm port from the tarsosDSP library by Joren Six.

example/example.md

class PitchCubit extends Cubit

final AudioRecorder _audioRecorder; final PitchDetector _pitchDetectorDart; final PitchHandler _pitchupDart;

PitchCubit(this._audioRecorder, this._pitchDetectorDart, this._pitchupDart): super(TunningState(note: "N/A", status: "Play something")) { _init(); }

_init() async {

final recordStream = await _audioRecorder.startStream(
  const RecordConfig(
    encoder: AudioEncoder.pcm16bits,
    numChannels: 1,
    bitRate: 128000,
    sampleRate: PitchDetector.DEFAULT_SAMPLE_RATE,
  )
);

var audioSampleBufferedStream = bufferedListStream(
  recordStream.map((event) {
    return event.toList();
  }),
  //The library converts a PCM16 to 8bits internally. So we need twice as many bytes
  PitchDetector.DEFAULT_BUFFER_SIZE * 2,
  ) ;

await for (var audioSample in audioSampleBufferedStream) {
  final intBuffer = Uint8List.fromList(audioSample);

  _pitchDetectorDart.getPitchFromIntBuffer(intBuffer).then((detectedPitch) {
    if (detectedPitch.pitched) {
       _pitchupDart.handlePitch(detectedPitch.pitch).then((pitchResult) => {
        
        emit(TunningState(
          note: pitchResult.note,
          status: pitchResult.tuningStatus.getDescription(),
        ))       
      });
    }
  });      
}    

} }

extension Description on TuningStatus {

String getDescription() => switch(this) { TuningStatus.tuned => "Tuned", TuningStatus.toolow => "Too low. Tighten the string", TuningStatus.toohigh => "Too hig. Give it some slack", TuningStatus.waytoolow => "Way too low. Tighten the string", TuningStatus.waytoohigh => "Way to high. Give it some slack", TuningStatus.undefined => "Note is not in the valid interval.", }; }