Move solution and projects to src

src/Ryujinx.Graphics.Nvdec.FFmpeg/FFmpegContext.cs

@@ -0,0 +1,175 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.Graphics.Nvdec.FFmpeg.Native;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Nvdec.FFmpeg
+{
+    unsafe class FFmpegContext : IDisposable
+    {
+        private unsafe delegate int AVCodec_decode(AVCodecContext* avctx, void* outdata, int* got_frame_ptr, AVPacket* avpkt);
+
+        private readonly AVCodec_decode _decodeFrame;
+        private static readonly FFmpegApi.av_log_set_callback_callback _logFunc;
+        private readonly AVCodec* _codec;
+        private AVPacket* _packet;
+        private AVCodecContext* _context;
+
+        public FFmpegContext(AVCodecID codecId)
+        {
+            _codec = FFmpegApi.avcodec_find_decoder(codecId);
+            if (_codec == null)
+            {
+                Logger.Error?.PrintMsg(LogClass.FFmpeg, $"Codec wasn't found. Make sure you have the {codecId} codec present in your FFmpeg installation.");
+
+                return;
+            }
+
+            _context = FFmpegApi.avcodec_alloc_context3(_codec);
+            if (_context == null)
+            {
+                Logger.Error?.PrintMsg(LogClass.FFmpeg, "Codec context couldn't be allocated.");
+
+                return;
+            }
+
+            if (FFmpegApi.avcodec_open2(_context, _codec, null) != 0)
+            {
+                Logger.Error?.PrintMsg(LogClass.FFmpeg, "Codec couldn't be opened.");
+
+                return;
+            }
+
+            _packet = FFmpegApi.av_packet_alloc();
+            if (_packet == null)
+            {
+                Logger.Error?.PrintMsg(LogClass.FFmpeg, "Packet couldn't be allocated.");
+
+                return;
+            }
+
+            int avCodecRawVersion = FFmpegApi.avcodec_version();
+            int avCodecMajorVersion = avCodecRawVersion >> 16;
+            int avCodecMinorVersion = (avCodecRawVersion >> 8) & 0xFF;
+
+            // libavcodec 59.24 changed AvCodec to move its private API and also move the codec function to an union.
+            if (avCodecMajorVersion > 59 || (avCodecMajorVersion == 59 && avCodecMinorVersion > 24))
+            {
+                _decodeFrame = Marshal.GetDelegateForFunctionPointer<AVCodec_decode>(((FFCodec<AVCodec>*)_codec)->CodecCallback);
+            }
+            // libavcodec 59.x changed AvCodec private API layout.
+            else if (avCodecMajorVersion == 59)
+            {
+                _decodeFrame = Marshal.GetDelegateForFunctionPointer<AVCodec_decode>(((FFCodecLegacy<AVCodec501>*)_codec)->Decode);
+            }
+            // libavcodec 58.x and lower
+            else
+            {
+                _decodeFrame = Marshal.GetDelegateForFunctionPointer<AVCodec_decode>(((FFCodecLegacy<AVCodec>*)_codec)->Decode);
+            }
+        }
+
+        static FFmpegContext()
+        {
+            _logFunc = Log;
+
+            // Redirect log output.
+            FFmpegApi.av_log_set_level(AVLog.MaxOffset);
+            FFmpegApi.av_log_set_callback(_logFunc);
+        }
+
+        private static void Log(void* ptr, AVLog level, string format, byte* vl)
+        {
+            if (level > FFmpegApi.av_log_get_level())
+            {
+                return;
+            }
+
+            int lineSize = 1024;
+            byte* lineBuffer = stackalloc byte[lineSize];
+            int printPrefix = 1;
+
+            FFmpegApi.av_log_format_line(ptr, level, format, vl, lineBuffer, lineSize, &printPrefix);
+
+            string line = Marshal.PtrToStringAnsi((IntPtr)lineBuffer).Trim();
+
+            switch (level)
+            {
+                case AVLog.Panic:
+                case AVLog.Fatal:
+                case AVLog.Error:
+                    Logger.Error?.Print(LogClass.FFmpeg, line);
+                    break;
+                case AVLog.Warning:
+                    Logger.Warning?.Print(LogClass.FFmpeg, line);
+                    break;
+                case AVLog.Info:
+                    Logger.Info?.Print(LogClass.FFmpeg, line);
+                    break;
+                case AVLog.Verbose:
+                case AVLog.Debug:
+                    Logger.Debug?.Print(LogClass.FFmpeg, line);
+                    break;
+                case AVLog.Trace:
+                    Logger.Trace?.Print(LogClass.FFmpeg, line);
+                    break;
+            }
+        }
+
+        public int DecodeFrame(Surface output, ReadOnlySpan<byte> bitstream)
+        {
+            FFmpegApi.av_frame_unref(output.Frame);
+
+            int result;
+            int gotFrame;
+
+            fixed (byte* ptr = bitstream)
+            {
+                _packet->Data = ptr;
+                _packet->Size = bitstream.Length;
+                result = _decodeFrame(_context, output.Frame, &gotFrame, _packet);
+            }
+
+            if (gotFrame == 0)
+            {
+                FFmpegApi.av_frame_unref(output.Frame);
+
+                // If the frame was not delivered, it was probably delayed.
+                // Get the next delayed frame by passing a 0 length packet.
+                _packet->Data = null;
+                _packet->Size = 0;
+                result = _decodeFrame(_context, output.Frame, &gotFrame, _packet);
+
+                // We need to set B frames to 0 as we already consumed all delayed frames.
+                // This prevents the decoder from trying to return a delayed frame next time.
+                _context->HasBFrames = 0;
+            }
+
+            FFmpegApi.av_packet_unref(_packet);
+
+            if (gotFrame == 0)
+            {
+                FFmpegApi.av_frame_unref(output.Frame);
+
+                return -1;
+            }
+
+            return result < 0 ? result : 0;
+        }
+
+        public void Dispose()
+        {
+            fixed (AVPacket** ppPacket = &_packet)
+            {
+                FFmpegApi.av_packet_free(ppPacket);
+            }
+
+            FFmpegApi.avcodec_close(_context);
+
+            fixed (AVCodecContext** ppContext = &_context)
+            {
+                FFmpegApi.avcodec_free_context(ppContext);
+            }
+        }
+    }
+}