/// <exception cref="DecoderException"></exception>
public IDecodedAudioFrame GetDecodedFrame(AudioConversionParameters optionalAudioConversionParameters = null)
{
IntPtr outBufferPtr;
int dataSize;
AudioFrameFormat format;
int resultCode;
if (optionalAudioConversionParameters == null ||
(optionalAudioConversionParameters.OutSampleRate == 0 || optionalAudioConversionParameters.OutSampleRate == _currentFrameFormat.SampleRate) &&
(optionalAudioConversionParameters.OutBitsPerSample == 0 || optionalAudioConversionParameters.OutBitsPerSample == _currentFrameFormat.BitPerSample) &&
(optionalAudioConversionParameters.OutChannels == 0 || optionalAudioConversionParameters.OutChannels == _currentFrameFormat.Channels))
{
resultCode = FFmpegAudioPInvoke.GetDecodedFrame(_decoderHandle, out outBufferPtr, out dataSize);
if (resultCode != 0)
{
throw new DecoderException($"An error occurred while getting decoded audio frame, {_audioCodecId} codec, code: {resultCode}");
}
format = _currentFrameFormat;
}
else
{
if (_resamplerHandle == IntPtr.Zero)
{
resultCode = FFmpegAudioPInvoke.CreateAudioResampler(_decoderHandle,
optionalAudioConversionParameters.OutSampleRate, optionalAudioConversionParameters.OutBitsPerSample,
optionalAudioConversionParameters.OutChannels, out _resamplerHandle);
if (resultCode != 0)
{
throw new DecoderException($"An error occurred while creating audio resampler, code: {resultCode}");
}
}
resultCode = FFmpegAudioPInvoke.ResampleDecodedFrame(_decoderHandle, _resamplerHandle, out outBufferPtr, out dataSize);
if (resultCode != 0)
{
throw new DecoderException($"An error occurred while converting audio frame, code: {resultCode}");
}
format = new AudioFrameFormat(optionalAudioConversionParameters.OutSampleRate != 0 ? optionalAudioConversionParameters.OutSampleRate : _currentFrameFormat.SampleRate,
optionalAudioConversionParameters.OutBitsPerSample != 0 ? optionalAudioConversionParameters.OutBitsPerSample : _currentFrameFormat.BitPerSample,
optionalAudioConversionParameters.OutChannels != 0 ? optionalAudioConversionParameters.OutChannels : _currentFrameFormat.Channels);
}
if (_decodedFrameBuffer.Length < dataSize)
{
_decodedFrameBuffer = new byte[dataSize];
}
Marshal.Copy(outBufferPtr, _decodedFrameBuffer, 0, dataSize);
return(new DecodedAudioFrame(_currentRawFrameTimestamp, new ArraySegment <byte>(_decodedFrameBuffer, 0, dataSize), format));
}
/// <exception cref="DecoderException"></exception>
public unsafe IDecodedAudioFrame GetDecodedFrame(ArraySegment <byte> bufferSegment)
{
Debug.Assert(bufferSegment.Array != null, "bufferSegment.Array != null");
fixed(byte *outByteSegmentPtr = &bufferSegment.Array[bufferSegment.Offset])
{
int resultCode = FFmpegAudioPInvoke.GetDecodedFrame(_decoderHandle, (IntPtr)outByteSegmentPtr);
if (resultCode != 0)
{
throw new DecoderException($"An error occurred while getting decoded audio frame, {_audioCodecId} codec, code: {resultCode}");
}
}
return(new DecodedAudioFrame(_currentRawFrameTimestamp, bufferSegment, _currentFrameFormat));
}