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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> m_Commands;
public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => m_Commands;
private int SampleRate;
private int ChannelsCount;
private OpusDecoder Decoder;
public IHardwareOpusDecoder(int SampleRate, int ChannelsCount)
{
m_Commands = new Dictionary<int, ServiceProcessRequest>()
{
{ 0, DecodeInterleaved },
{ 4, DecodeInterleavedWithPerf }
};
this.SampleRate = SampleRate;
this.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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