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//
// Copyright (c) 2019-2021 Ryujinx
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
using Ryujinx.Audio.Backends.Common;
using Ryujinx.Audio.Common;
using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Audio.Backends.CompatLayer
{
class CompatLayerHardwareDeviceSession : HardwareDeviceSessionOutputBase
{
private HardwareDeviceSessionOutputBase _realSession;
private uint _userChannelCount;
public CompatLayerHardwareDeviceSession(HardwareDeviceSessionOutputBase realSession, uint userChannelCount) : base(realSession.MemoryManager, realSession.RequestedSampleFormat, realSession.RequestedSampleRate, userChannelCount)
{
_realSession = realSession;
_userChannelCount = userChannelCount;
}
public override void Dispose()
{
_realSession.Dispose();
}
public override ulong GetPlayedSampleCount()
{
return _realSession.GetPlayedSampleCount();
}
public override float GetVolume()
{
return _realSession.GetVolume();
}
public override void PrepareToClose()
{
_realSession.PrepareToClose();
}
public override void QueueBuffer(AudioBuffer buffer)
{
_realSession.QueueBuffer(buffer);
}
public override bool RegisterBuffer(AudioBuffer buffer, byte[] samples)
{
if (RequestedSampleFormat != SampleFormat.PcmInt16)
{
throw new NotImplementedException("Downmixing formats other than PCM16 is not supported.");
}
if (samples == null)
{
return false;
}
short[] downmixedBufferPCM16;
ReadOnlySpan<short> samplesPCM16 = MemoryMarshal.Cast<byte, short>(samples);
if (_userChannelCount == 6)
{
downmixedBufferPCM16 = Downmixing.DownMixSurroundToStereo(samplesPCM16);
if (_realSession.RequestedChannelCount == 1)
{
downmixedBufferPCM16 = Downmixing.DownMixStereoToMono(downmixedBufferPCM16);
}
}
else if (_userChannelCount == 2 && _realSession.RequestedChannelCount == 1)
{
downmixedBufferPCM16 = Downmixing.DownMixStereoToMono(samplesPCM16);
}
else
{
throw new NotImplementedException($"Downmixing from {_userChannelCount} to {_realSession.RequestedChannelCount} not implemented.");
}
byte[] downmixedBuffer = MemoryMarshal.Cast<short, byte>(downmixedBufferPCM16).ToArray();
AudioBuffer fakeBuffer = new AudioBuffer
{
BufferTag = buffer.BufferTag,
DataPointer = buffer.DataPointer,
DataSize = (ulong)downmixedBuffer.Length
};
bool result = _realSession.RegisterBuffer(fakeBuffer, downmixedBuffer);
if (result)
{
buffer.Data = fakeBuffer.Data;
buffer.DataSize = fakeBuffer.DataSize;
}
return result;
}
public override void SetVolume(float volume)
{
_realSession.SetVolume(volume);
}
public override void Start()
{
_realSession.Start();
}
public override void Stop()
{
_realSession.Stop();
}
public override void UnregisterBuffer(AudioBuffer buffer)
{
_realSession.UnregisterBuffer(buffer);
}
public override bool WasBufferFullyConsumed(AudioBuffer buffer)
{
return _realSession.WasBufferFullyConsumed(buffer);
}
}
}
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