How do I detect End of Audio Stream Playback

[duong2417]

I am streaming audio data from a server using flutter_soloud, but I am unsure how to reliably detect when the last audio chunk has finished playing. This is my code:

  _currentStreamSource = _soloud!.setBufferStream(
        maxBufferSizeBytes: MAX_BUFFER_SIZE, // 10MB buffer
        sampleRate: SAMPLE_RATE,
        channels: Channels.mono,
        format: BufferType.s16le, // 16-bit signed little endian
        bufferingType:
            BufferingType.released, // Release played data to avoid overflow
        bufferingTimeNeeds:
            0.5, // Reduced from 1.0 to 0.5 seconds for faster start
        onBuffering: (isBuffering, handle, time) async {
        },
      );
      _currentStreamHandle =
          await _soloud!.play(_currentStreamSource!);

[alnitak]

Hi @duong2417,

when your connection has ended, you have to set the stream to be ended (SoLoud.setDataIsEnded) to eventually listen to the handle ended event SoundEventType.handleIsNoMoreValid.

I have updated the doc example here.

[agladyshev]

@duong2417 you should post more of your code, specifically how data from your server is fed into SoLoud AudioSource. If you are listening to byte stream, you should have something like this.

stream.listen(
      (audioChunk) {
        SoLoud.instance.addAudioDataStream(_currentStreamSource, audioChunk);
      },
      onDone: () {
        SoLoud.instance.setDataIsEnded(_currentStreamSource);
      },
      cancelOnError: true,
    );

When last of your data is received from server, you in onDone method SoLoud.instance.setDataIsEnded should be called. After that, when last piece of data is played, SoundEventType.handleIsNoMoreValid would be emitted. That means your playback is complete.

[duong2417]

no, my server only notifies when it has finished sending all audio chunks, and it does not know when the playback is complete.
the data that server sent like this:
if (socketData['status'] == 'tts_flushed') {
//the last chunk has finished (not mean playback done)
}

[agladyshev]

@duong2417 Yes, that's how it should be. When last chunk received you should call SoLoud.instance.setDataIsEnded(_currentStreamSource); to let player know that it should not expect any more chunks. Then, audioPlayer would finish playing audio when last chunk was played and you would receive SoundEventType.handleIsNoMoreValid if you are listening for events. You should have you own variable isPlaying that you manually update to false when you receive SoundEventType.handleIsNoMoreValid

[duong2417]

@agladyshev but I don't know how to detect the last audio chunk playback done

[agladyshev]

@agladyshev but I don't know how to detect the last audio chunk playback done

you don't have to, SoLoud player does that for you