internal unsafe OpusDecodingTranscoder(PipeReader input,
OpusAudioCodec codec)
{
_codec = codec;
int status;
_decoder = opus_decoder_create(codec.SamplingRate,
codec.ChannelCount, &status);
if (status < 0)
{
ThrowExternalException("Could not create Opus Decoder",
status);
}
_input = input;
_pipe = new Pipe();
}
static unsafe int WriteInternal(OpusDecoder *decoder,
int channelCount, ReadOnlySpan <byte> frame, PipeWriter writer)
{
var block = writer.GetSpan(OutputBufferSize);
int blockSize = block.Length / sizeof(short) / channelCount;
int encoded;
fixed(byte *opusData = frame)
fixed(short *outputBlock = MemoryMarshal
.Cast <byte, short>(block))
encoded = opus_decode(decoder, opusData, frame.Length,
outputBlock + 1, blockSize, 1);
return(encoded > 0 &&
!BinaryPrimitives.TryWriteInt16LittleEndian(block,
(short)encoded)
? -1
: encoded);
}
public static extern int opus_decoder_get_nb_samples([NativeTypeName("const OpusDecoder *")] OpusDecoder *dec, [NativeTypeName("const unsigned char []")] byte packet, [NativeTypeName("opus_int32")] int len);
public static extern void opus_decoder_destroy([NativeTypeName("OpusDecoder *")] OpusDecoder *st);
public static extern int opus_decoder_ctl([NativeTypeName("OpusDecoder *")] OpusDecoder *st, int request);
public static extern int opus_decode_float([NativeTypeName("OpusDecoder *")] OpusDecoder *st, [NativeTypeName("const unsigned char *")] byte *data, [NativeTypeName("opus_int32")] int len, [NativeTypeName("float *")] float *pcm, int frame_size, int decode_fec);
public static extern int opus_decoder_init([NativeTypeName("OpusDecoder *")] OpusDecoder *st, [NativeTypeName("opus_int32")] int Fs, int channels);
