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using Ryujinx.Graphics.Nvdec.H264;
using Ryujinx.Graphics.Nvdec.Image;
using Ryujinx.Graphics.Nvdec.Types.H264;
using Ryujinx.Graphics.Video;
using System;
namespace Ryujinx.Graphics.Nvdec
{
static class H264Decoder
{
private const int MbSizeInPixels = 16;
private static readonly Decoder _decoder = new Decoder();
public unsafe static void Decode(NvdecDevice device, ResourceManager rm, ref NvdecRegisters state)
{
PictureInfo pictureInfo = rm.Gmm.DeviceRead<PictureInfo>(state.SetPictureInfoOffset);
H264PictureInfo info = pictureInfo.Convert();
ReadOnlySpan<byte> bitstream = rm.Gmm.DeviceGetSpan(state.SetBitstreamOffset, (int)pictureInfo.BitstreamSize);
int width = (int)pictureInfo.PicWidthInMbs * MbSizeInPixels;
int height = (int)pictureInfo.PicHeightInMbs * MbSizeInPixels;
ISurface outputSurface = rm.Cache.Get(_decoder, CodecId.H264, 0, 0, width, height);
if (_decoder.Decode(ref info, outputSurface, bitstream))
{
int li = (int)pictureInfo.LumaOutputSurfaceIndex;
int ci = (int)pictureInfo.ChromaOutputSurfaceIndex;
uint lumaOffset = state.SetSurfaceLumaOffset[li];
uint chromaOffset = state.SetSurfaceChromaOffset[ci];
SurfaceWriter.Write(rm.Gmm, outputSurface, lumaOffset, chromaOffset);
device.OnFrameDecoded(CodecId.H264, lumaOffset, chromaOffset);
}
rm.Cache.Put(outputSurface);
}
}
}
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