internal StreamContext(AVStream *stream, FFMPEGDecoder source)
{
_stream = stream;
_source = source;
var origCtx = _stream->codec;
//find the corresponding codec
_codec = ffmpeg.avcodec_find_decoder(origCtx->codec_id);
if (_codec == null)
{
throw new NotSupportedException("This " + ffmpeg.av_get_media_type_string(origCtx->codec_type) +
" codec is not supported by the current ffmpeg binaries!");
}
//copy the context from ffmpeg (required because we don't own the other one)
_codecCtx = ffmpeg.avcodec_alloc_context3(_codec);
if (ffmpeg.avcodec_parameters_to_context(_codecCtx, _stream->codecpar) != 0)
{
throw new Exception("Couldn't copy stream parameters!");
}
if (ffmpeg.avcodec_open2(_codecCtx, _codec, null) != 0)
{
throw new Exception("Couldn't copy the codec!");
}
_decoded = ffmpeg.av_frame_alloc();
}
/// <summary>
/// Called once for each audio stream
/// </summary>
internal AudioContext(AVStream *stream, FFMPEGDecoder source, AudioFormat resampleTarget) : base(stream, source)
{
_resampleTarget = resampleTarget;
BufferCapacity = resampleTarget.SampleRate * resampleTarget.Channels * 4;
_circBuf = new CircularBuffer(BufferCapacity);
CreateAudio();
}