/// <summary>
/// Appends an audio buffer to the specified track
/// </summary>
/// <typeparam name="T">The sample type of the buffer</typeparam>
/// <param name="trackId">The track to append the buffer to</param>
/// <param name="bufferTag">The internal tag of the buffer</param>
/// <param name="buffer">The buffer to append to the track</param>
public void AppendBuffer <T>(int trackId, long bufferTag, T[] buffer) where T : struct
{
if (_tracks.TryGetValue(trackId, out OpenALAudioTrack track))
{
lock (track)
{
int bufferId = track.AppendBuffer(bufferTag);
// Do we need to downmix?
if (track.HardwareChannels != track.VirtualChannels)
{
short[] downmixedBuffer;
ReadOnlySpan <short> bufferPCM16 = MemoryMarshal.Cast <T, short>(buffer);
if (track.VirtualChannels == 6)
{
downmixedBuffer = Downmixing.DownMixSurroundToStereo(bufferPCM16);
if (track.HardwareChannels == 1)
{
downmixedBuffer = Downmixing.DownMixStereoToMono(downmixedBuffer);
}
}
else if (track.VirtualChannels == 2)
{
downmixedBuffer = Downmixing.DownMixStereoToMono(bufferPCM16);
}
else
{
throw new NotImplementedException($"Downmixing from {track.VirtualChannels} to {track.HardwareChannels} not implemented!");
}
AL.BufferData(bufferId, track.Format, downmixedBuffer, downmixedBuffer.Length * sizeof(ushort), track.SampleRate);
}
else
{
AL.BufferData(bufferId, track.Format, buffer, buffer.Length * sizeof(ushort), track.SampleRate);
}
AL.SourceQueueBuffer(track.SourceId, bufferId);
StartPlaybackIfNeeded(track);
track.PlayedSampleCount += (ulong)buffer.Length;
}
}
}
/// <summary>
/// Appends an audio buffer to the specified track
/// </summary>
/// <param name="trackId">The track to append the buffer to</param>
/// <param name="bufferTag">The internal tag of the buffer</param>
/// <param name="buffer">The buffer to append to the track</param>
public void AppendBuffer(int trackId, long bufferTag, ReadOnlySpan <short> buffer)
{
if (_tracks.TryGetValue(trackId, out OpenALAudioTrack track))
{
lock (track)
{
int bufferId = track.AppendBuffer(bufferTag);
// Do we need to downmix?
if (track.HardwareChannels != track.VirtualChannels)
{
short[] downmixedBuffer;
if (track.VirtualChannels == 6)
{
downmixedBuffer = Downmixing.DownMixSurroundToStereo(buffer);
if (track.HardwareChannels == 1)
{
downmixedBuffer = Downmixing.DownMixStereoToMono(downmixedBuffer);
}
}
else if (track.VirtualChannels == 2)
{
downmixedBuffer = Downmixing.DownMixStereoToMono(buffer);
}
else
{
throw new NotImplementedException($"Downmixing from {track.VirtualChannels} to {track.HardwareChannels} not implemented!");
}
AL.BufferData(bufferId, track.Format, downmixedBuffer, downmixedBuffer.Length * Marshal.SizeOf <ushort>(), track.SampleRate);
}
else
{
AL.BufferData(bufferId, track.Format, buffer.ToArray(), buffer.Length * Marshal.SizeOf <ushort>(), track.SampleRate);
}
AL.SourceQueueBuffer(track.SourceId, bufferId);
StartPlaybackIfNeeded(track);
}
}
}
