internal static extern AudioConverterStatus AudioConverterFillComplexBuffer(
[NotNull] AudioConverterHandle handle,
[NotNull] NativeCallbacks.AudioConverterComplexInputCallback inputCallback,
IntPtr userData,
ref uint packetSize,
ref AudioBufferList outputData,
[CanBeNull][In, Out] AudioStreamPacketDescription[] packetDescriptions);
public unsafe SampleBuffer DecodeSamples()
{
Span <int> buffer = stackalloc int[(int)(_defaultFrameCount * _outputDescription.ChannelsPerFrame)];
var bufferList = new AudioBufferList
{
NumberBuffers = 1,
Buffers = new AudioBuffer[1]
};
bufferList.Buffers[0].NumberChannels = _outputDescription.ChannelsPerFrame;
bufferList.Buffers[0].DataByteSize = (uint)(buffer.Length * Marshal.SizeOf <int>());
bufferList.Buffers[0].Data = new IntPtr(Unsafe.AsPointer(ref MemoryMarshal.GetReference(buffer)));
var frameCount = _defaultFrameCount;
// ReSharper disable once PossibleNullReferenceException
_converter.FillBuffer(ref frameCount, ref bufferList, null);
if (frameCount == 0)
{
Finished = true;
}
var result = new SampleBuffer(
buffer.Slice(0, (int)(frameCount * _outputDescription.ChannelsPerFrame)),
(int)_outputDescription.ChannelsPerFrame, 32);
return(result);
}
public unsafe void Submit(SampleBuffer samples)
{
if (samples.Frames == 0)
{
return;
}
if (_replayGainExport != null)
{
samples = _replayGainExport.Value.Process(samples);
}
Span <float> buffer = stackalloc float[samples.Frames * samples.Channels];
samples.CopyToInterleaved(buffer);
var bufferList = new AudioBufferList
{
NumberBuffers = 1,
Buffers = new AudioBuffer[1]
};
bufferList.Buffers[0].NumberChannels = (uint)samples.Channels;
bufferList.Buffers[0].DataByteSize = (uint)(buffer.Length * Marshal.SizeOf <float>());
bufferList.Buffers[0].Data = new IntPtr(Unsafe.AsPointer(ref MemoryMarshal.GetReference(buffer)));
// ReSharper disable once PossibleNullReferenceException
var status = _audioFile.Write(bufferList, (uint)samples.Frames);
if (status != ExtendedAudioFileStatus.Ok)
{
throw new AudioEncodingException($"Apple AAC encoder encountered error '{status}'.");
}
}
public unsafe void Submit(SampleBuffer samples)
{
if (samples.Frames == 0)
{
return;
}
Span <int> buffer = stackalloc int[samples.Frames * samples.Channels];
samples.CopyToInterleaved(buffer, _bitsPerSample);
var bufferList = new AudioBufferList
{
NumberBuffers = 1,
Buffers = new AudioBuffer[1]
};
bufferList.Buffers[0].NumberChannels = (uint)samples.Channels;
bufferList.Buffers[0].DataByteSize = (uint)(buffer.Length * sizeof(int));
bufferList.Buffers[0].Data = new(Unsafe.AsPointer(ref MemoryMarshal.GetReference(buffer)));
var status = _audioFile !.Write(bufferList, (uint)samples.Frames);
if (status != ExtendedAudioFileStatus.Ok)
{
throw new AudioEncodingException($"Apple Lossless encoder encountered error '{status}'.");
}
}
internal void FillBuffer(
ref uint packetSize,
ref AudioBufferList outputBuffer,
[CanBeNull] AudioStreamPacketDescription[] packetDescriptions)
{
SafeNativeMethods.AudioConverterFillComplexBuffer(_handle, _inputCallback, IntPtr.Zero,
ref packetSize, ref outputBuffer, packetDescriptions);
}
unsafe AudioConverterStatus InputCallback(
IntPtr handle,
ref uint numberPackets,
ref AudioBufferList data,
IntPtr packetDescriptions,
IntPtr userData)
{
if (_buffer == null)
{
_buffer = MemoryPool <byte> .Shared.Rent((int)
(numberPackets * _audioFile.GetProperty <uint>(AudioFilePropertyId.PacketSizeUpperBound)));
// ReSharper disable once PossibleNullReferenceException
_bufferHandle = _buffer.Memory.Pin();
}
if (_descriptionsHandle.IsAllocated)
{
_descriptionsHandle.Free();
}
var inputDescriptions = new AudioStreamPacketDescription[numberPackets];
_audioFile.ReadPackets(out var numBytes, inputDescriptions, _packetIndex, ref numberPackets,
new IntPtr(_bufferHandle.Pointer));
_packetIndex += numberPackets;
data.Buffers[0].DataByteSize = numBytes;
data.Buffers[0].Data = new IntPtr(_bufferHandle.Pointer);
// If this conversion requires packet descriptions, provide them
// ReSharper disable once InvertIf
if (packetDescriptions != IntPtr.Zero)
{
_descriptionsHandle = GCHandle.Alloc(inputDescriptions, GCHandleType.Pinned);
Marshal.WriteIntPtr(packetDescriptions, _descriptionsHandle.AddrOfPinnedObject());
}
return(AudioConverterStatus.Ok);
}
internal static extern ExtendedAudioFileStatus ExtAudioFileWrite(
[NotNull] ExtendedAudioFileHandle handle,
uint frames,
ref AudioBufferList data);
internal ExtendedAudioFileStatus Write(AudioBufferList data, uint frames)
{
return(SafeNativeMethods.ExtAudioFileWrite(_handle, frames, ref data));
}
