createAudioDecoder method

@override Future<PlatformAudioDecoder?> createAudioDecoder(AudioDecoderConfig config, { BackendContext? context, })

Construct an audio decoder. Default implementation returns null — backends without audio support don't need to override.

Implementation

@override
Future<PlatformAudioDecoder?> createAudioDecoder(
  AudioDecoderConfig config, {
  BackendContext? context,
}) async {
  if (!_audioCodecs.contains(config.codec)) return null;
  if (!WebCapability.hasAudioDecoder) return null;
  // The constructor existing does not mean this codec is implemented. Ask
  // before committing, so an unsupported codec falls through to a lower
  // -priority backend (e.g. the decodeAudioData fallback) instead of
  // configuring and throwing in the caller's face.
  if (!await WebCapability.isAudioDecoderSupported(
    audioCodecString(config.codec, config.backendOptions),
    sampleRate: config.sampleRate ?? 48000,
    channels: config.channels ?? 2,
  )) {
    return null;
  }
  return await WorkerAudioDecoder.tryCreate(config) ??
      await WebCodecsAudioDecoder.create(config);
}