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using FFmpeg.AutoGen;
using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.VDec
{
unsafe static class FFmpegWrapper
{
private static AVCodec* Codec;
private static AVCodecContext* Context;
private static AVFrame* Frame;
private static SwsContext* ScalerCtx;
private static int ScalerWidth;
private static int ScalerHeight;
public static bool IsInitialized { get; private set; }
public static void H264Initialize()
{
EnsureCodecInitialized(AVCodecID.AV_CODEC_ID_H264);
}
public static void Vp9Initialize()
{
EnsureCodecInitialized(AVCodecID.AV_CODEC_ID_VP9);
}
private static void EnsureCodecInitialized(AVCodecID CodecId)
{
if (IsInitialized)
{
Uninitialize();
}
Codec = ffmpeg.avcodec_find_decoder(CodecId);
Context = ffmpeg.avcodec_alloc_context3(Codec);
Frame = ffmpeg.av_frame_alloc();
ffmpeg.avcodec_open2(Context, Codec, null);
IsInitialized = true;
}
public static int DecodeFrame(byte[] Data)
{
if (!IsInitialized)
{
throw new InvalidOperationException("Tried to use uninitialized codec!");
}
AVPacket Packet;
ffmpeg.av_init_packet(&Packet);
fixed (byte* Ptr = Data)
{
Packet.data = Ptr;
Packet.size = Data.Length;
ffmpeg.avcodec_send_packet(Context, &Packet);
}
return ffmpeg.avcodec_receive_frame(Context, Frame);
}
public static FFmpegFrame GetFrame()
{
if (!IsInitialized)
{
throw new InvalidOperationException("Tried to use uninitialized codec!");
}
AVFrame ManagedFrame = Marshal.PtrToStructure<AVFrame>((IntPtr)Frame);
byte*[] Data = ManagedFrame.data.ToArray();
return new FFmpegFrame()
{
Width = ManagedFrame.width,
Height = ManagedFrame.height,
LumaPtr = Data[0],
ChromaBPtr = Data[1],
ChromaRPtr = Data[2]
};
}
public static FFmpegFrame GetFrameRgba()
{
if (!IsInitialized)
{
throw new InvalidOperationException("Tried to use uninitialized codec!");
}
AVFrame ManagedFrame = Marshal.PtrToStructure<AVFrame>((IntPtr)Frame);
EnsureScalerSetup(ManagedFrame.width, ManagedFrame.height);
byte*[] Data = ManagedFrame.data.ToArray();
int[] LineSizes = ManagedFrame.linesize.ToArray();
byte[] Dst = new byte[ManagedFrame.width * ManagedFrame.height * 4];
fixed (byte* Ptr = Dst)
{
byte*[] DstData = new byte*[] { Ptr };
int[] DstLineSizes = new int[] { ManagedFrame.width * 4 };
ffmpeg.sws_scale(ScalerCtx, Data, LineSizes, 0, ManagedFrame.height, DstData, DstLineSizes);
}
return new FFmpegFrame()
{
Width = ManagedFrame.width,
Height = ManagedFrame.height,
Data = Dst
};
}
private static void EnsureScalerSetup(int Width, int Height)
{
if (Width == 0 || Height == 0)
{
return;
}
if (ScalerCtx == null || ScalerWidth != Width || ScalerHeight != Height)
{
FreeScaler();
ScalerCtx = ffmpeg.sws_getContext(
Width, Height, AVPixelFormat.AV_PIX_FMT_YUV420P,
Width, Height, AVPixelFormat.AV_PIX_FMT_RGBA, 0, null, null, null);
ScalerWidth = Width;
ScalerHeight = Height;
}
}
public static void Uninitialize()
{
if (IsInitialized)
{
ffmpeg.av_frame_unref(Frame);
ffmpeg.av_free(Frame);
ffmpeg.avcodec_close(Context);
FreeScaler();
IsInitialized = false;
}
}
private static void FreeScaler()
{
if (ScalerCtx != null)
{
ffmpeg.sws_freeContext(ScalerCtx);
ScalerCtx = null;
}
}
}
}
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