/// <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($"An error occurred while converting audio frame, code: {resultCode}");
}
format = new AudioFrameFormat(optionalAudioConversionParameters.OutSampleRate != 0 ? optionalAudioConversionParameters.OutSampleRate : _currentFrameFormat.SampleRate,
optionalAudioConversionParameters.OutBitsPerSample != 0 ? optionalAudioConversionParameters.OutBitsPerSample : _currentFrameFormat.BitPerSample,
optionalAudioConversionParameters.OutChannels != 0 ? optionalAudioConversionParameters.OutChannels : _currentFrameFormat.Channels);
}
if (_decodedFrameBuffer.Length < dataSize)
{
_decodedFrameBuffer = new byte[dataSize];
}
Marshal.Copy(outBufferPtr, _decodedFrameBuffer, 0, dataSize);
return(new DecodedAudioFrame(_currentRawFrameTimestamp, new ArraySegment <byte>(_decodedFrameBuffer, 0, dataSize), format));
}
/// <exception cref="DecoderException"></exception>
public static FFmpegAudioDecoder CreateDecoder(FFmpegAudioCodecId audioCodecId, int bitsPerCodedSample)
{
int resultCode = FFmpegAudioPInvoke.CreateAudioDecoder(audioCodecId, bitsPerCodedSample, out IntPtr decoderPtr);
if (resultCode != 0)
{
throw new DecoderException($"An error occurred while creating audio decoder for {audioCodecId} codec, code: {resultCode}");
}
return(new FFmpegAudioDecoder(audioCodecId, bitsPerCodedSample, decoderPtr));
}
public void Dispose()
{
if (_disposed)
{
return;
}
_disposed = true;
FFmpegAudioPInvoke.RemoveAudioDecoder(_decoderHandle);
if (_resamplerHandle != IntPtr.Zero)
{
FFmpegAudioPInvoke.RemoveAudioResampler(_resamplerHandle);
}
GC.SuppressFinalize(this);
}
/// <exception cref="DecoderException"></exception>
public unsafe bool TryDecode(RawAudioFrame rawAudioFrame)
{
if (rawAudioFrame is RawAACFrame aacFrame)
{
Debug.Assert(aacFrame.ConfigSegment.Array != null, "aacFrame.ConfigSegment.Array != null");
if (!_extraData.SequenceEqual(aacFrame.ConfigSegment))
{
if (_extraData.Length == aacFrame.ConfigSegment.Count)
{
Buffer.BlockCopy(aacFrame.ConfigSegment.Array, aacFrame.ConfigSegment.Offset, _extraData, 0,
aacFrame.ConfigSegment.Count);
}
else
_extraData = aacFrame.ConfigSegment.ToArray();
fixed(byte *extradataPtr = &_extraData[0])
{
int resultCode = FFmpegAudioPInvoke.SetAudioDecoderExtraData(_decoderHandle, (IntPtr)extradataPtr, aacFrame.ConfigSegment.Count);
if (resultCode != 0)
{
throw new DecoderException($"An error occurred while setting audio extra data, {_audioCodecId} codec, code: {resultCode}");
}
}
}
}
Debug.Assert(rawAudioFrame.FrameSegment.Array != null, "rawAudioFrame.FrameSegment.Array != null");
fixed(byte *rawBufferPtr = &rawAudioFrame.FrameSegment.Array[rawAudioFrame.FrameSegment.Offset])
{
int resultCode = FFmpegAudioPInvoke.DecodeFrame(_decoderHandle, (IntPtr)rawBufferPtr,
rawAudioFrame.FrameSegment.Count, out int sampleRate, out int bitsPerSample, out int channels);
_currentRawFrameTimestamp = rawAudioFrame.Timestamp;
if (resultCode != 0)
{
return(false);
}
if (rawAudioFrame is RawG711Frame g711Frame)
{
sampleRate = g711Frame.SampleRate;
channels = g711Frame.Channels;
}
if (_currentFrameFormat.SampleRate != sampleRate || _currentFrameFormat.BitPerSample != bitsPerSample ||
_currentFrameFormat.Channels != channels)
{
_currentFrameFormat = new AudioFrameFormat(sampleRate, bitsPerSample, channels);
if (_resamplerHandle != IntPtr.Zero)
{
FFmpegAudioPInvoke.RemoveAudioResampler(_resamplerHandle);
}
}
}
return(true);
}