53 lines
1.7 KiB
C#
53 lines
1.7 KiB
C#
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using FFmpeg.AutoGen;
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using Ryujinx.Graphics.Video;
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using System;
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namespace Ryujinx.Graphics.Nvdec.FFmpeg.Vp8
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{
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public sealed class Decoder : IDecoder
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{
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public bool IsHardwareAccelerated => false;
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private readonly FFmpegContext _context = new FFmpegContext(AVCodecID.AV_CODEC_ID_VP8);
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public ISurface CreateSurface(int width, int height)
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{
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return new Surface(width, height);
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}
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public bool Decode(ref Vp8PictureInfo pictureInfo, ISurface output, ReadOnlySpan<byte> bitstream)
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{
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Surface outSurf = (Surface)output;
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int uncompHeaderSize = pictureInfo.KeyFrame ? 10 : 3;
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byte[] frame = new byte[bitstream.Length + uncompHeaderSize];
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uint firstPartSizeShifted = pictureInfo.FirstPartSize << 5;
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frame[0] = (byte)(pictureInfo.KeyFrame ? 0 : 1);
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frame[0] |= (byte)((pictureInfo.Version & 7) << 1);
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frame[0] |= 1 << 4;
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frame[0] |= (byte)firstPartSizeShifted;
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frame[1] |= (byte)(firstPartSizeShifted >> 8);
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frame[2] |= (byte)(firstPartSizeShifted >> 16);
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if (pictureInfo.KeyFrame)
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{
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frame[3] = 0x9d;
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frame[4] = 0x01;
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frame[5] = 0x2a;
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frame[6] = (byte)pictureInfo.FrameWidth;
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frame[7] = (byte)((pictureInfo.FrameWidth >> 8) & 0x3F);
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frame[8] = (byte)pictureInfo.FrameHeight;
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frame[9] = (byte)((pictureInfo.FrameHeight >> 8) & 0x3F);
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}
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bitstream.CopyTo(new Span<byte>(frame).Slice(uncompHeaderSize));
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return _context.DecodeFrame(outSurf, frame) == 0;
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}
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public void Dispose() => _context.Dispose();
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}
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}
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