Ryujinx/Ryujinx.Graphics.Nvdec.H264/Decoder.cs

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C#
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using Ryujinx.Graphics.Video;
using System;
namespace Ryujinx.Graphics.Nvdec.H264
{
public sealed class Decoder : IH264Decoder
{
public bool IsHardwareAccelerated => false;
private const int WorkBufferSize = 0x200;
private readonly byte[] _workBuffer = new byte[WorkBufferSize];
private readonly FFmpegContext _context = new FFmpegContext();
public ISurface CreateSurface(int width, int height)
{
return new Surface();
}
public bool Decode(ref H264PictureInfo pictureInfo, ISurface output, ReadOnlySpan<byte> bitstream)
{
Span<byte> bs = Prepend(bitstream, SpsAndPpsReconstruction.Reconstruct(ref pictureInfo, _workBuffer));
return _context.DecodeFrame((Surface)output, bs) == 0;
}
private static byte[] Prepend(ReadOnlySpan<byte> data, ReadOnlySpan<byte> prep)
{
byte[] output = new byte[data.Length + prep.Length];
prep.CopyTo(output);
data.CopyTo(new Span<byte>(output).Slice(prep.Length));
return output;
}
public void Dispose() => _context.Dispose();
}
}