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using Concentus.Structs;
using Ryujinx.HLE.HOS.Ipc;
using System.Collections.Generic;
using static Ryujinx.HLE.HOS.ErrorCode;
namespace Ryujinx.HLE.HOS.Services.Aud
{
class IHardwareOpusDecoder : IpcService
{
private const int FixedSampleRate = 48000;
private Dictionary<int, ServiceProcessRequest> _commands;
public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => _commands;
private int _sampleRate;
private int _channelsCount;
private OpusDecoder _decoder;
public IHardwareOpusDecoder(int sampleRate, int channelsCount)
{
_commands = new Dictionary<int, ServiceProcessRequest>
{
{ 0, DecodeInterleaved },
{ 4, DecodeInterleavedWithPerf }
};
_sampleRate = sampleRate;
_channelsCount = channelsCount;
_decoder = new OpusDecoder(FixedSampleRate, channelsCount);
}
public long DecodeInterleavedWithPerf(ServiceCtx context)
{
long result = DecodeInterleaved(context);
//TODO: Figure out what this value is.
//According to switchbrew, it is now used.
context.ResponseData.Write(0L);
return result;
}
public long DecodeInterleaved(ServiceCtx context)
{
long inPosition = context.Request.SendBuff[0].Position;
long inSize = context.Request.SendBuff[0].Size;
if (inSize < 8)
{
return MakeError(ErrorModule.Audio, AudErr.OpusInvalidInput);
}
long outPosition = context.Request.ReceiveBuff[0].Position;
long outSize = context.Request.ReceiveBuff[0].Size;
byte[] opusData = context.Memory.ReadBytes(inPosition, inSize);
int processed = ((opusData[0] << 24) |
(opusData[1] << 16) |
(opusData[2] << 8) |
(opusData[3] << 0)) + 8;
if ((uint)processed > (ulong)inSize)
{
return MakeError(ErrorModule.Audio, AudErr.OpusInvalidInput);
}
short[] pcm = new short[outSize / 2];
int frameSize = pcm.Length / (_channelsCount * 2);
int samples = _decoder.Decode(opusData, 0, opusData.Length, pcm, 0, frameSize);
foreach (short sample in pcm)
{
context.Memory.WriteInt16(outPosition, sample);
outPosition += 2;
}
context.ResponseData.Write(processed);
context.ResponseData.Write(samples);
return 0;
}
}
}
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