public bool Decode(ref Vp8PictureInfo pictureInfo, ISurface output, ReadOnlySpan <byte> bitstream)
{
Surface outSurf = (Surface)output;
int uncompHeaderSize = pictureInfo.KeyFrame ? 10 : 3;
byte[] frame = new byte[bitstream.Length + uncompHeaderSize];
uint firstPartSizeShifted = pictureInfo.FirstPartSize << 5;
frame[0] = (byte)(pictureInfo.KeyFrame ? 0 : 1);
frame[0] |= (byte)((pictureInfo.Version & 7) << 1);
frame[0] |= 1 << 4;
frame[0] |= (byte)firstPartSizeShifted;
frame[1] |= (byte)(firstPartSizeShifted >> 8);
frame[2] |= (byte)(firstPartSizeShifted >> 16);
if (pictureInfo.KeyFrame)
{
frame[3] = 0x9d;
frame[4] = 0x01;
frame[5] = 0x2a;
frame[6] = (byte)pictureInfo.FrameWidth;
frame[7] = (byte)((pictureInfo.FrameWidth >> 8) & 0x3F);
frame[8] = (byte)pictureInfo.FrameHeight;
frame[9] = (byte)((pictureInfo.FrameHeight >> 8) & 0x3F);
}
bitstream.CopyTo(new Span <byte>(frame).Slice(uncompHeaderSize));
return(_context.DecodeFrame(outSurf, frame) == 0);
}
public static void Decode(NvdecDecoderContext context, ResourceManager rm, ref NvdecRegisters state)
{
PictureInfo pictureInfo = rm.Gmm.DeviceRead <PictureInfo>(state.SetPictureInfoOffset);
ReadOnlySpan <byte> bitstream = rm.Gmm.DeviceGetSpan(state.SetBitstreamOffset, (int)pictureInfo.VLDBufferSize);
Decoder decoder = context.GetVp8Decoder();
ISurface outputSurface = rm.Cache.Get(decoder, 0, 0, pictureInfo.FrameWidth, pictureInfo.FrameHeight);
Vp8PictureInfo info = pictureInfo.Convert();
uint lumaOffset = state.SetSurfaceLumaOffset[3];
uint chromaOffset = state.SetSurfaceChromaOffset[3];
if (decoder.Decode(ref info, outputSurface, bitstream))
{
SurfaceWriter.Write(rm.Gmm, outputSurface, lumaOffset, chromaOffset);
}
rm.Cache.Put(outputSurface);
}
