glintDecodeAudio function

GlintDecodedAudio glintDecodeAudio(Uint8List data, { int rate = 0, })

Decode a whole encoded stream (MP3 / AAC-LC / Ogg-Opus, format auto- detected, Opus surround included) to interleaved float PCM. rate resamples the output (0 = keep native). Throws on unrecognized input.

Implementation

GlintDecodedAudio glintDecodeAudio(Uint8List data, {int rate = 0}) {
  if (data.isEmpty) throw StateError('empty input');
  final lib = _loadLibrary();
  final fn =
      lib.lookupFunction<_DecodeExNative, _DecodeEx>('glint_decode_audio_ex');
  final free = lib.lookupFunction<_FreeNative, _Free>('glint_free');
  final inPtr = calloc<Uint8>(data.length);
  inPtr.asTypedList(data.length).setAll(0, data);
  final sr = calloc<Int32>();
  final ch = calloc<Int32>();
  final fr = calloc<Int32>();
  try {
    final ptr = fn(inPtr, data.length, rate, 0, sr, ch, fr);
    if (ptr == nullptr || ch.value <= 0) {
      throw StateError('decode failed (unrecognized or corrupt input)');
    }
    final total = fr.value * ch.value;
    final pcm = Float32List.fromList(ptr.cast<Float>().asTypedList(total));
    free(ptr);
    return GlintDecodedAudio(pcm, sr.value, ch.value);
  } finally {
    calloc.free(inPtr);
    calloc.free(sr);
    calloc.free(ch);
    calloc.free(fr);
  }
}