ryujinx/Ryujinx.Graphics.Nvdec.H264/FFmpegContext.cs

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C#
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using FFmpeg.AutoGen;
using System;
namespace Ryujinx.Graphics.Nvdec.H264
{
unsafe class FFmpegContext : IDisposable
{
private readonly AVCodec* _codec;
private AVCodecContext* _context;
public FFmpegContext()
{
_codec = ffmpeg.avcodec_find_decoder(AVCodecID.AV_CODEC_ID_H264);
_context = ffmpeg.avcodec_alloc_context3(_codec);
ffmpeg.avcodec_open2(_context, _codec, null);
}
public int DecodeFrame(Surface output, ReadOnlySpan<byte> bitstream)
{
AVPacket packet;
ffmpeg.av_init_packet(&packet);
fixed (byte* ptr = bitstream)
{
packet.data = ptr;
packet.size = bitstream.Length;
int rc = ffmpeg.avcodec_send_packet(_context, &packet);
if (rc != 0)
{
return rc;
}
}
return ffmpeg.avcodec_receive_frame(_context, output.Frame);
}
public void Dispose()
{
ffmpeg.avcodec_close(_context);
fixed (AVCodecContext** ppContext = &_context)
{
ffmpeg.avcodec_free_context(ppContext);
}
}
}
}