Q: How to output left or right audio out channels? about coast_audio

[SKKbySSK]

There is no built-in class to choose output destination (like panning).
But you can try this code to perform volume control on each channel.

const format = AudioFormat(sampleRate: 48000, channels: 2); // sampleFormat is float32 by default.
final functionNode = FunctionNode(
  function: const SineFunction(),
  frequency: 440,
  format: format,
);
final frames = AllocatedAudioFrames(
  length: 1024,
  format: format,
);

frames.acquireBuffer((buffer) {
  const leftVolume = 1.0;
  const rightVolume = 0.0;

  final framesRead = functionNode.outputBus.read(buffer);
  final floatList = buffer.limit(framesRead).asFloat32ListView();
  for (var i = 0; floatList.length > i; i += format.channels) {
    // interleaved audio sample
    floatList[i] *= leftVolume;
    floatList[i + 1] *= rightVolume;
  }
});

[github-actions]

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