glintEncodeAudio function

Uint8List glintEncodeAudio(Float32List pcm, int channels, int sampleRate, GlintCodec codec, { int bitrate = 128, int? vbrQuality, int quality = 1, })

One-call encode: interleaved float PCM (±1.0) at any rate / 1-2 channels -> a complete MP3 / AAC-LC / Ogg-Opus stream. The input is auto-resampled to a codec-valid rate (Opus->48k, MP3/AAC->nearest supported). bitrate in kbps; vbrQuality 0..9 selects VBR.

Implementation

Uint8List glintEncodeAudio(
    Float32List pcm, int channels, int sampleRate, GlintCodec codec,
    {int bitrate = 128, int? vbrQuality, int quality = 1}) {
  if (channels < 1 || channels > 2 || pcm.isEmpty) {
    throw StateError('encode: bad channels/empty input');
  }
  final lib = _loadLibrary();
  final fn =
      lib.lookupFunction<_EncAudioNative, _EncAudio>('glint_encode_audio');
  final free = lib.lookupFunction<_FreeNative, _Free>('glint_free');
  final inPtr = calloc<Float>(pcm.length);
  inPtr.asTypedList(pcm.length).setAll(0, pcm);
  final outSize = calloc<Int32>();
  try {
    final frames = pcm.length ~/ channels;
    final ptr = fn(inPtr, frames, channels, sampleRate, codec.index, bitrate,
        vbrQuality ?? -1, quality, outSize);
    if (ptr == nullptr || outSize.value <= 0) {
      throw StateError('encode failed');
    }
    final out = Uint8List.fromList(ptr.asTypedList(outSize.value));
    free(ptr.cast<Void>());
    return out;
  } finally {
    calloc.free(inPtr);
    calloc.free(outSize);
  }
}