Re-add NVDEC project (not integrated)

Ryujinx.Graphics.Gpu/GpuContext.cs

@@ -28,7 +28,7 @@ namespace Ryujinx.Graphics.Gpu
         /// <summary>
         /// GPU memory accessor.
         /// </summary>
-        internal MemoryAccessor MemoryAccessor { get; }
+        public MemoryAccessor MemoryAccessor { get; }
 
         /// <summary>
         /// GPU engine methods processing.

Ryujinx.Graphics.Gpu/Memory/MemoryAccessor.cs

@@ -6,7 +6,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
     /// <summary>
     /// GPU mapped memory accessor.
     /// </summary>
-    class MemoryAccessor
+    public class MemoryAccessor
     {
         private GpuContext _context;
 
@@ -19,6 +19,17 @@ namespace Ryujinx.Graphics.Gpu.Memory
             _context = context;
         }
 
+        /// <summary>
+        /// Reads a byte array from GPU mapped memory.
+        /// </summary>
+        /// <param name="gpuVa">GPU virtual address where the data is located</param>
+        /// <param name="size">Size of the data in bytes</param>
+        /// <returns>Byte array with the data</returns>
+        public byte[] ReadBytes(ulong gpuVa, ulong size)
+        {
+            return Read(gpuVa, size).ToArray();
+        }
+
         /// <summary>
         /// Reads data from GPU mapped memory.
         /// This reads as much data as possible, up to the specified maximum size.
@@ -62,6 +73,30 @@ namespace Ryujinx.Graphics.Gpu.Memory
             return BitConverter.ToInt32(_context.PhysicalMemory.Read(processVa, 4));
         }
 
+        /// <summary>
+        /// Reads a 64-bits unsigned integer from GPU mapped memory.
+        /// </summary>
+        /// <param name="gpuVa">GPU virtual address where the value is located</param>
+        /// <returns>The value at the specified memory location</returns>
+        public ulong ReadUInt64(ulong gpuVa)
+        {
+            ulong processVa = _context.MemoryManager.Translate(gpuVa);
+
+            return BitConverter.ToUInt64(_context.PhysicalMemory.Read(processVa, 8));
+        }
+
+        /// <summary>
+        /// Reads a 8-bits unsigned integer from GPU mapped memory.
+        /// </summary>
+        /// <param name="gpuVa">GPU virtual address where the value is located</param>
+        /// <param name="value">The value to be written</param>
+        public void WriteByte(ulong gpuVa, byte value)
+        {
+            ulong processVa = _context.MemoryManager.Translate(gpuVa);
+
+            _context.PhysicalMemory.Write(processVa, MemoryMarshal.CreateSpan(ref value, 1));
+        }
+
         /// <summary>
         /// Writes a 32-bits signed integer to GPU mapped memory.
         /// </summary>

Ryujinx.Graphics.Gpu/Memory/MemoryManager.cs

@@ -252,7 +252,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// </summary>
         /// <param name="gpuVa">GPU virtual address to be translated</param>
         /// <returns>CPU virtual address</returns>
-        internal ulong Translate(ulong gpuVa)
+        public ulong Translate(ulong gpuVa)
         {
             ulong baseAddress = GetPte(gpuVa);
 

Ryujinx.Graphics.Nvdec/CdmaProcessor.cs

@@ -0,0 +1,103 @@
+using Ryujinx.Graphics.Gpu;
+using Ryujinx.Graphics.VDec;
+using Ryujinx.Graphics.Vic;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics
+{
+    public class CdmaProcessor
+    {
+        private const int MethSetMethod = 0x10;
+        private const int MethSetData   = 0x11;
+
+        private readonly VideoDecoder _videoDecoder;
+        private readonly VideoImageComposer _videoImageComposer;
+
+        public CdmaProcessor()
+        {
+            _videoDecoder = new VideoDecoder();
+            _videoImageComposer = new VideoImageComposer(_videoDecoder);
+        }
+
+        public void PushCommands(GpuContext gpu, int[] cmdBuffer)
+        {
+            List<ChCommand> commands = new List<ChCommand>();
+
+            ChClassId currentClass = 0;
+
+            for (int index = 0; index < cmdBuffer.Length; index++)
+            {
+                int cmd = cmdBuffer[index];
+
+                int value        = (cmd >> 0)  & 0xffff;
+                int methodOffset = (cmd >> 16) & 0xfff;
+
+                ChSubmissionMode submissionMode = (ChSubmissionMode)((cmd >> 28) & 0xf);
+
+                switch (submissionMode)
+                {
+                    case ChSubmissionMode.SetClass: currentClass = (ChClassId)(value >> 6); break;
+
+                    case ChSubmissionMode.Incrementing:
+                    {
+                        int count = value;
+
+                        for (int argIdx = 0; argIdx < count; argIdx++)
+                        {
+                            int argument = cmdBuffer[++index];
+
+                            commands.Add(new ChCommand(currentClass, methodOffset + argIdx, argument));
+                        }
+
+                        break;
+                    }
+
+                    case ChSubmissionMode.NonIncrementing:
+                    {
+                        int count = value;
+
+                        int[] arguments = new int[count];
+
+                        for (int argIdx = 0; argIdx < count; argIdx++)
+                        {
+                            arguments[argIdx] = cmdBuffer[++index];
+                        }
+
+                        commands.Add(new ChCommand(currentClass, methodOffset, arguments));
+
+                        break;
+                    }
+                }
+            }
+
+            ProcessCommands(gpu, commands.ToArray());
+        }
+
+        private void ProcessCommands(GpuContext gpu, ChCommand[] commands)
+        {
+            int methodOffset = 0;
+
+            foreach (ChCommand command in commands)
+            {
+                switch (command.MethodOffset)
+                {
+                    case MethSetMethod: methodOffset = command.Arguments[0]; break;
+
+                    case MethSetData:
+                    {
+                        if (command.ClassId == ChClassId.NvDec)
+                        {
+                            _videoDecoder.Process(gpu, methodOffset, command.Arguments);
+                        }
+                        else if (command.ClassId == ChClassId.GraphicsVic)
+                        {
+                            _videoImageComposer.Process(gpu, methodOffset, command.Arguments);
+                        }
+
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/ChClassId.cs

@@ -0,0 +1,20 @@
+namespace Ryujinx.Graphics
+{
+    enum ChClassId
+    {
+        Host1X              = 0x1,
+        VideoEncodeMpeg     = 0x20,
+        VideoEncodeNvEnc    = 0x21,
+        VideoStreamingVi    = 0x30,
+        VideoStreamingIsp   = 0x32,
+        VideoStreamingIspB  = 0x34,
+        VideoStreamingViI2c = 0x36,
+        GraphicsVic         = 0x5d,
+        Graphics3D          = 0x60,
+        GraphicsGpu         = 0x61,
+        Tsec                = 0xe0,
+        TsecB               = 0xe1,
+        NvJpg               = 0xc0,
+        NvDec               = 0xf0
+    }
+}

Ryujinx.Graphics.Nvdec/ChCommandEntry.cs

@@ -0,0 +1,18 @@
+namespace Ryujinx.Graphics
+{
+    struct ChCommand
+    {
+        public ChClassId ClassId { get; private set; }
+
+        public int MethodOffset { get; private set; }
+
+        public int[] Arguments { get; private set; }
+
+        public ChCommand(ChClassId classId, int methodOffset, params int[] arguments)
+        {
+            ClassId      = classId;
+            MethodOffset = methodOffset;
+            Arguments    = arguments;
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/ChSubmissionMode.cs

@@ -0,0 +1,13 @@
+namespace Ryujinx.Graphics
+{
+    enum ChSubmissionMode
+    {
+        SetClass        = 0,
+        Incrementing    = 1,
+        NonIncrementing = 2,
+        Mask            = 3,
+        Immediate       = 4,
+        Restart         = 5,
+        Gather          = 6
+    }
+}

Ryujinx.Graphics.Nvdec/Ryujinx.Graphics.Nvdec.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FFmpeg.AutoGen" Version="4.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Ryujinx.Graphics.Gpu\Ryujinx.Graphics.Gpu.csproj" />
+  </ItemGroup>
+
+</Project>

Ryujinx.Graphics.Nvdec/VDec/BitStreamWriter.cs

@@ -0,0 +1,75 @@
+using System.IO;
+
+namespace Ryujinx.Graphics.VDec
+{
+    class BitStreamWriter
+    {
+        private const int BufferSize = 8;
+
+        private Stream _baseStream;
+
+        private int _buffer;
+        private int _bufferPos;
+
+        public BitStreamWriter(Stream baseStream)
+        {
+            _baseStream = baseStream;
+        }
+
+        public void WriteBit(bool value)
+        {
+            WriteBits(value ? 1 : 0, 1);
+        }
+
+        public void WriteBits(int value, int valueSize)
+        {
+            int valuePos = 0;
+
+            int remaining = valueSize;
+
+            while (remaining > 0)
+            {
+                int copySize = remaining;
+
+                int free = GetFreeBufferBits();
+
+                if (copySize > free)
+                {
+                    copySize = free;
+                }
+
+                int mask = (1 << copySize) - 1;
+
+                int srcShift = (valueSize  - valuePos)  - copySize;
+                int dstShift = (BufferSize - _bufferPos) - copySize;
+
+                _buffer |= ((value >> srcShift) & mask) << dstShift;
+
+                valuePos   += copySize;
+                _bufferPos += copySize;
+                remaining  -= copySize;
+            }
+        }
+
+        private int GetFreeBufferBits()
+        {
+            if (_bufferPos == BufferSize)
+            {
+                Flush();
+            }
+
+            return BufferSize - _bufferPos;
+        }
+
+        public void Flush()
+        {
+            if (_bufferPos != 0)
+            {
+                _baseStream.WriteByte((byte)_buffer);
+
+                _buffer    = 0;
+                _bufferPos = 0;
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/DecoderHelper.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Ryujinx.Graphics.VDec
+{
+    static class DecoderHelper
+    {
+        public static byte[] Combine(byte[] arr0, byte[] arr1)
+        {
+            byte[] output = new byte[arr0.Length + arr1.Length];
+
+            Buffer.BlockCopy(arr0, 0, output, 0, arr0.Length);
+            Buffer.BlockCopy(arr1, 0, output, arr0.Length, arr1.Length);
+
+            return output;
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/FFmpeg.cs

@@ -0,0 +1,168 @@
+using FFmpeg.AutoGen;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.VDec
+{
+    static unsafe 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;
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/FFmpegFrame.cs

@@ -0,0 +1,14 @@
+namespace Ryujinx.Graphics.VDec
+{
+    unsafe struct FFmpegFrame
+    {
+        public int Width;
+        public int Height;
+
+        public byte* LumaPtr;
+        public byte* ChromaBPtr;
+        public byte* ChromaRPtr;
+
+        public byte[] Data;
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/H264BitStreamWriter.cs

@@ -0,0 +1,79 @@
+using System.IO;
+
+namespace Ryujinx.Graphics.VDec
+{
+    class H264BitStreamWriter : BitStreamWriter
+    {
+        public H264BitStreamWriter(Stream baseStream) : base(baseStream) { }
+
+        public void WriteU(int value, int valueSize)
+        {
+            WriteBits(value, valueSize);
+        }
+
+        public void WriteSe(int value)
+        {
+            WriteExpGolombCodedInt(value);
+        }
+
+        public void WriteUe(int value)
+        {
+            WriteExpGolombCodedUInt((uint)value);
+        }
+
+        public void End()
+        {
+            WriteBit(true);
+
+            Flush();
+        }
+
+        private void WriteExpGolombCodedInt(int value)
+        {
+            int sign = value <= 0 ? 0 : 1;
+
+            if (value < 0)
+            {
+                value = -value;
+            }
+
+            value = (value << 1) - sign;
+
+            WriteExpGolombCodedUInt((uint)value);
+        }
+
+        private void WriteExpGolombCodedUInt(uint value)
+        {
+            int size = 32 - CountLeadingZeros((int)value + 1);
+
+            WriteBits(1, size);
+
+            value -= (1u << (size - 1)) - 1;
+
+            WriteBits((int)value, size - 1);
+        }
+
+        private static readonly byte[] ClzNibbleTbl = { 4, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+        private static int CountLeadingZeros(int value)
+        {
+            if (value == 0)
+            {
+                return 32;
+            }
+
+            int nibbleIdx = 32;
+            int preCount, count = 0;
+
+            do
+            {
+                nibbleIdx -= 4;
+                preCount = ClzNibbleTbl[(value >> nibbleIdx) & 0b1111];
+                count += preCount;
+            }
+            while (preCount == 4);
+
+            return count;
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/H264Decoder.cs

@@ -0,0 +1,238 @@
+using System.IO;
+
+namespace Ryujinx.Graphics.VDec
+{
+    class H264Decoder
+    {
+        private int    _log2MaxPicOrderCntLsbMinus4;
+        private bool   _deltaPicOrderAlwaysZeroFlag;
+        private bool   _frameMbsOnlyFlag;
+        private int    _picWidthInMbs;
+        private int    _picHeightInMapUnits;
+        private bool   _entropyCodingModeFlag;
+        private bool   _bottomFieldPicOrderInFramePresentFlag;
+        private int    _numRefIdxL0DefaultActiveMinus1;
+        private int    _numRefIdxL1DefaultActiveMinus1;
+        private bool   _deblockingFilterControlPresentFlag;
+        private bool   _redundantPicCntPresentFlag;
+        private bool   _transform8x8ModeFlag;
+        private bool   _mbAdaptiveFrameFieldFlag;
+        private bool   _direct8x8InferenceFlag;
+        private bool   _weightedPredFlag;
+        private bool   _constrainedIntraPredFlag;
+        private bool   _fieldPicFlag;
+        private bool   _bottomFieldFlag;
+        private int    _log2MaxFrameNumMinus4;
+        private int    _chromaFormatIdc;
+        private int    _picOrderCntType;
+        private int    _picInitQpMinus26;
+        private int    _chromaQpIndexOffset;
+        private int    _chromaQpIndexOffset2;
+        private int    _weightedBipredIdc;
+        private int    _frameNumber;
+        private byte[] _scalingMatrix4;
+        private byte[] _scalingMatrix8;
+
+        public void Decode(H264ParameterSets Params, H264Matrices matrices, byte[] frameData)
+        {
+            _log2MaxPicOrderCntLsbMinus4           = Params.Log2MaxPicOrderCntLsbMinus4;
+            _deltaPicOrderAlwaysZeroFlag           = Params.DeltaPicOrderAlwaysZeroFlag;
+            _frameMbsOnlyFlag                      = Params.FrameMbsOnlyFlag;
+            _picWidthInMbs                         = Params.PicWidthInMbs;
+            _picHeightInMapUnits                   = Params.PicHeightInMapUnits;
+            _entropyCodingModeFlag                 = Params.EntropyCodingModeFlag;
+            _bottomFieldPicOrderInFramePresentFlag = Params.BottomFieldPicOrderInFramePresentFlag;
+            _numRefIdxL0DefaultActiveMinus1        = Params.NumRefIdxL0DefaultActiveMinus1;
+            _numRefIdxL1DefaultActiveMinus1        = Params.NumRefIdxL1DefaultActiveMinus1;
+            _deblockingFilterControlPresentFlag    = Params.DeblockingFilterControlPresentFlag;
+            _redundantPicCntPresentFlag            = Params.RedundantPicCntPresentFlag;
+            _transform8x8ModeFlag                  = Params.Transform8x8ModeFlag;
+
+            _mbAdaptiveFrameFieldFlag = ((Params.Flags >> 0) & 1) != 0;
+            _direct8x8InferenceFlag   = ((Params.Flags >> 1) & 1) != 0;
+            _weightedPredFlag         = ((Params.Flags >> 2) & 1) != 0;
+            _constrainedIntraPredFlag = ((Params.Flags >> 3) & 1) != 0;
+            _fieldPicFlag             = ((Params.Flags >> 5) & 1) != 0;
+            _bottomFieldFlag          = ((Params.Flags >> 6) & 1) != 0;
+
+            _log2MaxFrameNumMinus4  = (int)(Params.Flags >> 8)  & 0xf;
+            _chromaFormatIdc        = (int)(Params.Flags >> 12) & 0x3;
+            _picOrderCntType        = (int)(Params.Flags >> 14) & 0x3;
+            _picInitQpMinus26       = (int)(Params.Flags >> 16) & 0x3f;
+            _chromaQpIndexOffset    = (int)(Params.Flags >> 22) & 0x1f;
+            _chromaQpIndexOffset2   = (int)(Params.Flags >> 27) & 0x1f;
+            _weightedBipredIdc      = (int)(Params.Flags >> 32) & 0x3;
+            _frameNumber            = (int)(Params.Flags >> 46) & 0x1ffff;
+
+            _picInitQpMinus26     = (_picInitQpMinus26     << 26) >> 26;
+            _chromaQpIndexOffset  = (_chromaQpIndexOffset  << 27) >> 27;
+            _chromaQpIndexOffset2 = (_chromaQpIndexOffset2 << 27) >> 27;
+
+            _scalingMatrix4 = matrices.ScalingMatrix4;
+            _scalingMatrix8 = matrices.ScalingMatrix8;
+
+            if (FFmpegWrapper.IsInitialized)
+            {
+                FFmpegWrapper.DecodeFrame(frameData);
+            }
+            else
+            {
+                FFmpegWrapper.H264Initialize();
+
+                FFmpegWrapper.DecodeFrame(DecoderHelper.Combine(EncodeHeader(), frameData));
+            }
+        }
+
+        private byte[] EncodeHeader()
+        {
+            using (MemoryStream data = new MemoryStream())
+            {
+                H264BitStreamWriter writer = new H264BitStreamWriter(data);
+
+                // Sequence Parameter Set.
+                writer.WriteU(1, 24);
+                writer.WriteU(0, 1);
+                writer.WriteU(3, 2);
+                writer.WriteU(7, 5);
+                writer.WriteU(100, 8);
+                writer.WriteU(0, 8);
+                writer.WriteU(31, 8);
+                writer.WriteUe(0);
+                writer.WriteUe(_chromaFormatIdc);
+
+                if (_chromaFormatIdc == 3)
+                {
+                    writer.WriteBit(false);
+                }
+
+                writer.WriteUe(0);
+                writer.WriteUe(0);
+                writer.WriteBit(false);
+                writer.WriteBit(false); //Scaling matrix present flag
+
+                writer.WriteUe(_log2MaxFrameNumMinus4);
+                writer.WriteUe(_picOrderCntType);
+
+                if (_picOrderCntType == 0)
+                {
+                    writer.WriteUe(_log2MaxPicOrderCntLsbMinus4);
+                }
+                else if (_picOrderCntType == 1)
+                {
+                    writer.WriteBit(_deltaPicOrderAlwaysZeroFlag);
+
+                    writer.WriteSe(0);
+                    writer.WriteSe(0);
+                    writer.WriteUe(0);
+                }
+
+                int picHeightInMbs = _picHeightInMapUnits / (_frameMbsOnlyFlag ? 1 : 2);
+
+                writer.WriteUe(16);
+                writer.WriteBit(false);
+                writer.WriteUe(_picWidthInMbs - 1);
+                writer.WriteUe(picHeightInMbs - 1);
+                writer.WriteBit(_frameMbsOnlyFlag);
+
+                if (!_frameMbsOnlyFlag)
+                {
+                    writer.WriteBit(_mbAdaptiveFrameFieldFlag);
+                }
+
+                writer.WriteBit(_direct8x8InferenceFlag);
+                writer.WriteBit(false); //Frame cropping flag
+                writer.WriteBit(false); //VUI parameter present flag
+
+                writer.End();
+
+                // Picture Parameter Set.
+                writer.WriteU(1, 24);
+                writer.WriteU(0, 1);
+                writer.WriteU(3, 2);
+                writer.WriteU(8, 5);
+
+                writer.WriteUe(0);
+                writer.WriteUe(0);
+
+                writer.WriteBit(_entropyCodingModeFlag);
+                writer.WriteBit(false);
+                writer.WriteUe(0);
+                writer.WriteUe(_numRefIdxL0DefaultActiveMinus1);
+                writer.WriteUe(_numRefIdxL1DefaultActiveMinus1);
+                writer.WriteBit(_weightedPredFlag);
+                writer.WriteU(_weightedBipredIdc, 2);
+                writer.WriteSe(_picInitQpMinus26);
+                writer.WriteSe(0);
+                writer.WriteSe(_chromaQpIndexOffset);
+                writer.WriteBit(_deblockingFilterControlPresentFlag);
+                writer.WriteBit(_constrainedIntraPredFlag);
+                writer.WriteBit(_redundantPicCntPresentFlag);
+                writer.WriteBit(_transform8x8ModeFlag);
+
+                writer.WriteBit(true);
+
+                for (int index = 0; index < 6; index++)
+                {
+                    writer.WriteBit(true);
+
+                    WriteScalingList(writer, _scalingMatrix4, index * 16, 16);
+                }
+
+                if (_transform8x8ModeFlag)
+                {
+                    for (int index = 0; index < 2; index++)
+                    {
+                        writer.WriteBit(true);
+
+                        WriteScalingList(writer, _scalingMatrix8, index * 64, 64);
+                    }
+                }
+
+                writer.WriteSe(_chromaQpIndexOffset2);
+
+                writer.End();
+
+                return data.ToArray();
+            }
+        }
+
+        // ZigZag LUTs from libavcodec.
+        private static readonly byte[] ZigZagDirect = new byte[]
+        {
+            0,   1,  8, 16,  9,  2,  3, 10,
+            17, 24, 32, 25, 18, 11,  4,  5,
+            12, 19, 26, 33, 40, 48, 41, 34,
+            27, 20, 13,  6,  7, 14, 21, 28,
+            35, 42, 49, 56, 57, 50, 43, 36,
+            29, 22, 15, 23, 30, 37, 44, 51,
+            58, 59, 52, 45, 38, 31, 39, 46,
+            53, 60, 61, 54, 47, 55, 62, 63
+        };
+
+        private static readonly byte[] ZigZagScan = new byte[]
+        {
+            0 + 0 * 4, 1 + 0 * 4, 0 + 1 * 4, 0 + 2 * 4,
+            1 + 1 * 4, 2 + 0 * 4, 3 + 0 * 4, 2 + 1 * 4,
+            1 + 2 * 4, 0 + 3 * 4, 1 + 3 * 4, 2 + 2 * 4,
+            3 + 1 * 4, 3 + 2 * 4, 2 + 3 * 4, 3 + 3 * 4
+        };
+
+        private static void WriteScalingList(H264BitStreamWriter writer, byte[] list, int start, int count)
+        {
+            byte[] scan = count == 16 ? ZigZagScan : ZigZagDirect;
+
+            int lastScale = 8;
+
+            for (int index = 0; index < count; index++)
+            {
+                byte value = list[start + scan[index]];
+
+                int deltaScale = value - lastScale;
+
+                writer.WriteSe(deltaScale);
+
+                lastScale = value;
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/H264Matrices.cs

@@ -0,0 +1,8 @@
+namespace Ryujinx.Graphics.VDec
+{
+    struct H264Matrices
+    {
+        public byte[] ScalingMatrix4;
+        public byte[] ScalingMatrix8;
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/H264ParameterSets.cs

@@ -0,0 +1,34 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.VDec
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 4)]
+    struct H264ParameterSets
+    {
+        public int  Log2MaxPicOrderCntLsbMinus4;
+        public bool DeltaPicOrderAlwaysZeroFlag;
+        public bool FrameMbsOnlyFlag;
+        public int  PicWidthInMbs;
+        public int  PicHeightInMapUnits;
+        public int  Reserved6C;
+        public bool EntropyCodingModeFlag;
+        public bool BottomFieldPicOrderInFramePresentFlag;
+        public int  NumRefIdxL0DefaultActiveMinus1;
+        public int  NumRefIdxL1DefaultActiveMinus1;
+        public bool DeblockingFilterControlPresentFlag;
+        public bool RedundantPicCntPresentFlag;
+        public bool Transform8x8ModeFlag;
+        public int  Unknown8C;
+        public int  Unknown90;
+        public int  Reserved94;
+        public int  Unknown98;
+        public int  Reserved9C;
+        public int  ReservedA0;
+        public int  UnknownA4;
+        public int  ReservedA8;
+        public int  UnknownAC;
+        public long Flags;
+        public int  FrameNumber;
+        public int  FrameNumber2;
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/VideoCodec.cs

@@ -0,0 +1,10 @@
+namespace Ryujinx.Graphics.VDec
+{
+    enum VideoCodec
+    {
+        H264 = 3,
+        Vp8  = 5,
+        H265 = 7,
+        Vp9  = 9
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/VideoDecoder.cs

@@ -0,0 +1,266 @@
+using Ryujinx.Graphics.Gpu;
+using Ryujinx.Graphics.Vic;
+using System;
+
+namespace Ryujinx.Graphics.VDec
+{
+    unsafe class VideoDecoder
+    {
+        private H264Decoder _h264Decoder;
+        private Vp9Decoder  _vp9Decoder;
+
+        private VideoCodec _currentVideoCodec;
+
+        private ulong _decoderContextAddress;
+        private ulong _frameDataAddress;
+        private ulong _vpxCurrLumaAddress;
+        private ulong _vpxRef0LumaAddress;
+        private ulong _vpxRef1LumaAddress;
+        private ulong _vpxRef2LumaAddress;
+        private ulong _vpxCurrChromaAddress;
+        private ulong _vpxRef0ChromaAddress;
+        private ulong _vpxRef1ChromaAddress;
+        private ulong _vpxRef2ChromaAddress;
+        private ulong _vpxProbTablesAddress;
+
+        public VideoDecoder()
+        {
+            _h264Decoder = new H264Decoder();
+            _vp9Decoder  = new Vp9Decoder();
+        }
+
+        public void Process(GpuContext gpu, int methodOffset, int[] arguments)
+        {
+            VideoDecoderMeth method = (VideoDecoderMeth)methodOffset;
+
+            switch (method)
+            {
+                case VideoDecoderMeth.SetVideoCodec: SetVideoCodec(arguments); break;
+                case VideoDecoderMeth.Execute: Execute(gpu); break;
+                case VideoDecoderMeth.SetDecoderCtxAddr: SetDecoderCtxAddr(arguments); break;
+                case VideoDecoderMeth.SetFrameDataAddr: SetFrameDataAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxCurrLumaAddr: SetVpxCurrLumaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxRef0LumaAddr: SetVpxRef0LumaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxRef1LumaAddr: SetVpxRef1LumaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxRef2LumaAddr: SetVpxRef2LumaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxCurrChromaAddr: SetVpxCurrChromaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxRef0ChromaAddr: SetVpxRef0ChromaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxRef1ChromaAddr: SetVpxRef1ChromaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxRef2ChromaAddr: SetVpxRef2ChromaAddr(arguments); break;
+                case VideoDecoderMeth.SetVpxProbTablesAddr: SetVpxProbTablesAddr(arguments); break;
+            }
+        }
+
+        private void SetVideoCodec(int[] arguments)
+        {
+            _currentVideoCodec = (VideoCodec)arguments[0];
+        }
+
+        private void Execute(GpuContext gpu)
+        {
+            if (_currentVideoCodec == VideoCodec.H264)
+            {
+                int frameDataSize = gpu.MemoryAccessor.ReadInt32(_decoderContextAddress + 0x48);
+
+                H264ParameterSets Params = gpu.MemoryAccessor.Read<H264ParameterSets>(_decoderContextAddress + 0x58);
+
+                H264Matrices matrices = new H264Matrices()
+                {
+                    ScalingMatrix4 = gpu.MemoryAccessor.ReadBytes(_decoderContextAddress + 0x1c0, 6 * 16),
+                    ScalingMatrix8 = gpu.MemoryAccessor.ReadBytes(_decoderContextAddress + 0x220, 2 * 64)
+                };
+
+                byte[] frameData = gpu.MemoryAccessor.ReadBytes(_frameDataAddress, (ulong)frameDataSize);
+
+                _h264Decoder.Decode(Params, matrices, frameData);
+            }
+            else if (_currentVideoCodec == VideoCodec.Vp9)
+            {
+                int frameDataSize = gpu.MemoryAccessor.ReadInt32(_decoderContextAddress + 0x30);
+
+                Vp9FrameKeys keys = new Vp9FrameKeys()
+                {
+                    CurrKey = (long)gpu.MemoryManager.Translate(_vpxCurrLumaAddress),
+                    Ref0Key = (long)gpu.MemoryManager.Translate(_vpxRef0LumaAddress),
+                    Ref1Key = (long)gpu.MemoryManager.Translate(_vpxRef1LumaAddress),
+                    Ref2Key = (long)gpu.MemoryManager.Translate(_vpxRef2LumaAddress)
+                };
+
+                Vp9FrameHeader header = gpu.MemoryAccessor.Read<Vp9FrameHeader>(_decoderContextAddress + 0x48);
+
+                Vp9ProbabilityTables probs = new Vp9ProbabilityTables()
+                {
+                    SegmentationTreeProbs = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x387, 0x7),
+                    SegmentationPredProbs = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x38e, 0x3),
+                    Tx8x8Probs            = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x470, 0x2),
+                    Tx16x16Probs          = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x472, 0x4),
+                    Tx32x32Probs          = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x476, 0x6),
+                    CoefProbs             = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x5a0, 0x900),
+                    SkipProbs             = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x537, 0x3),
+                    InterModeProbs        = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x400, 0x1c),
+                    InterpFilterProbs     = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x52a, 0x8),
+                    IsInterProbs          = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x41c, 0x4),
+                    CompModeProbs         = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x532, 0x5),
+                    SingleRefProbs        = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x580, 0xa),
+                    CompRefProbs          = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x58a, 0x5),
+                    YModeProbs0           = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x480, 0x20),
+                    YModeProbs1           = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x47c, 0x4),
+                    PartitionProbs        = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x4e0, 0x40),
+                    MvJointProbs          = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x53b, 0x3),
+                    MvSignProbs           = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x53e, 0x3),
+                    MvClassProbs          = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x54c, 0x14),
+                    MvClass0BitProbs      = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x540, 0x3),
+                    MvBitsProbs           = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x56c, 0x14),
+                    MvClass0FrProbs       = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x560, 0xc),
+                    MvFrProbs             = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x542, 0x6),
+                    MvClass0HpProbs       = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x548, 0x2),
+                    MvHpProbs             = gpu.MemoryAccessor.ReadBytes(_vpxProbTablesAddress + 0x54a, 0x2)
+                };
+
+                byte[] frameData = gpu.MemoryAccessor.ReadBytes(_frameDataAddress, (ulong)frameDataSize);
+
+                _vp9Decoder.Decode(keys, header, probs, frameData);
+            }
+            else
+            {
+                ThrowUnimplementedCodec();
+            }
+        }
+
+        private void SetDecoderCtxAddr(int[] arguments)
+        {
+            _decoderContextAddress = GetAddress(arguments);
+        }
+
+        private void SetFrameDataAddr(int[] arguments)
+        {
+            _frameDataAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxCurrLumaAddr(int[] arguments)
+        {
+            _vpxCurrLumaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxRef0LumaAddr(int[] arguments)
+        {
+            _vpxRef0LumaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxRef1LumaAddr(int[] arguments)
+        {
+            _vpxRef1LumaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxRef2LumaAddr(int[] arguments)
+        {
+            _vpxRef2LumaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxCurrChromaAddr(int[] arguments)
+        {
+            _vpxCurrChromaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxRef0ChromaAddr(int[] arguments)
+        {
+            _vpxRef0ChromaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxRef1ChromaAddr(int[] arguments)
+        {
+            _vpxRef1ChromaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxRef2ChromaAddr(int[] arguments)
+        {
+            _vpxRef2ChromaAddress = GetAddress(arguments);
+        }
+
+        private void SetVpxProbTablesAddr(int[] arguments)
+        {
+            _vpxProbTablesAddress = GetAddress(arguments);
+        }
+
+        private static ulong GetAddress(int[] arguments)
+        {
+            return (ulong)(uint)arguments[0] << 8;
+        }
+
+        internal void CopyPlanes(GpuContext gpu, SurfaceOutputConfig outputConfig)
+        {
+            switch (outputConfig.PixelFormat)
+            {
+                case SurfacePixelFormat.Rgba8:   CopyPlanesRgba8  (gpu, outputConfig); break;
+                case SurfacePixelFormat.Yuv420P: CopyPlanesYuv420P(gpu, outputConfig); break;
+
+                default: ThrowUnimplementedPixelFormat(outputConfig.PixelFormat); break;
+            }
+        }
+
+        private void CopyPlanesRgba8(GpuContext gpu, SurfaceOutputConfig outputConfig)
+        {
+            FFmpegFrame frame = FFmpegWrapper.GetFrameRgba();
+
+            if ((frame.Width | frame.Height) == 0)
+            {
+                return;
+            }
+
+            throw new NotImplementedException();
+        }
+
+        private void CopyPlanesYuv420P(GpuContext gpu, SurfaceOutputConfig outputConfig)
+        {
+            FFmpegFrame frame = FFmpegWrapper.GetFrame();
+
+            if ((frame.Width | frame.Height) == 0)
+            {
+                return;
+            }
+
+            int halfSrcWidth = frame.Width / 2;
+
+            int halfWidth  = frame.Width  / 2;
+            int halfHeight = frame.Height / 2;
+
+            int alignedWidth = (outputConfig.SurfaceWidth + 0xff) & ~0xff;
+
+            for (int y = 0; y < frame.Height; y++)
+            {
+                int src = y * frame.Width;
+                int dst = y * alignedWidth;
+
+                int size = frame.Width;
+
+                for (int offset = 0; offset < size; offset++)
+                {
+                    gpu.MemoryAccessor.WriteByte(outputConfig.SurfaceLumaAddress + (ulong)dst + (ulong)offset, *(frame.LumaPtr + src + offset));
+                }
+            }
+
+            // Copy chroma data from both channels with interleaving.
+            for (int y = 0; y < halfHeight; y++)
+            {
+                int src = y * halfSrcWidth;
+                int dst = y * alignedWidth;
+
+                for (int x = 0; x < halfWidth; x++)
+                {
+                    gpu.MemoryAccessor.WriteByte(outputConfig.SurfaceChromaUAddress + (ulong)dst + (ulong)x * 2 + 0, *(frame.ChromaBPtr + src + x));
+                    gpu.MemoryAccessor.WriteByte(outputConfig.SurfaceChromaUAddress + (ulong)dst + (ulong)x * 2 + 1, *(frame.ChromaRPtr + src + x));
+                }
+            }
+        }
+
+        private void ThrowUnimplementedCodec()
+        {
+            throw new NotImplementedException($"Codec \"{_currentVideoCodec}\" is not supported!");
+        }
+
+        private void ThrowUnimplementedPixelFormat(SurfacePixelFormat pixelFormat)
+        {
+            throw new NotImplementedException($"Pixel format \"{pixelFormat}\" is not supported!");
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/VideoDecoderMeth.cs

@@ -0,0 +1,19 @@
+namespace Ryujinx.Graphics.VDec
+{
+    enum VideoDecoderMeth
+    {
+        SetVideoCodec        = 0x80,
+        Execute              = 0xc0,
+        SetDecoderCtxAddr    = 0x101,
+        SetFrameDataAddr     = 0x102,
+        SetVpxRef0LumaAddr   = 0x10c,
+        SetVpxRef1LumaAddr   = 0x10d,
+        SetVpxRef2LumaAddr   = 0x10e,
+        SetVpxCurrLumaAddr   = 0x10f,
+        SetVpxRef0ChromaAddr = 0x11d,
+        SetVpxRef1ChromaAddr = 0x11e,
+        SetVpxRef2ChromaAddr = 0x11f,
+        SetVpxCurrChromaAddr = 0x120,
+        SetVpxProbTablesAddr = 0x170
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/Vp9Decoder.cs

@@ -0,0 +1,879 @@
+using System.Collections.Generic;
+using System.IO;
+
+namespace Ryujinx.Graphics.VDec
+{
+    class Vp9Decoder
+    {
+        private const int DiffUpdateProbability = 252;
+
+        private const int FrameSyncCode = 0x498342;
+
+        private static readonly int[] MapLut = new int[]
+        {
+            20,  21,  22,  23,  24,  25,  0,   26,  27,  28,  29,  30,  31,  32,  33,  34,
+            35,  36,  37,  1,   38,  39,  40,  41,  42,  43,  44,  45,  46,  47,  48,  49,
+            2,   50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  3,   62,  63,
+            64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  4,   74,  75,  76,  77,  78,
+            79,  80,  81,  82,  83,  84,  85,  5,   86,  87,  88,  89,  90,  91,  92,  93,
+            94,  95,  96,  97,  6,   98,  99,  100, 101, 102, 103, 104, 105, 106, 107, 108,
+            109, 7,   110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 8,   122,
+            123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 9,   134, 135, 136, 137,
+            138, 139, 140, 141, 142, 143, 144, 145, 10,  146, 147, 148, 149, 150, 151, 152,
+            153, 154, 155, 156, 157, 11,  158, 159, 160, 161, 162, 163, 164, 165, 166, 167,
+            168, 169, 12,  170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 13,
+            182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 14,  194, 195, 196,
+            197, 198, 199, 200, 201, 202, 203, 204, 205, 15,  206, 207, 208, 209, 210, 211,
+            212, 213, 214, 215, 216, 217, 16,  218, 219, 220, 221, 222, 223, 224, 225, 226,
+            227, 228, 229, 17,  230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241,
+            18,  242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 19
+        };
+
+        private byte[] DefaultTx8x8Probs   = new byte[] { 100, 66 };
+        private byte[] DefaultTx16x16Probs = new byte[] { 20, 152, 15, 101 };
+        private byte[] DefaultTx32x32Probs = new byte[] { 3, 136, 37, 5, 52, 13 };
+
+        private byte[] _defaultCoefProbs = new byte[]
+        {
+            195, 29,  183, 0, 84,  49,  136, 0, 8,   42,  71,  0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 31,  107, 169, 0, 35,  99,  159, 0,
+            17,  82,  140, 0, 8,   66,  114, 0, 2,   44,  76,  0, 1,   19,  32,  0,
+            40,  132, 201, 0, 29,  114, 187, 0, 13,  91,  157, 0, 7,   75,  127, 0,
+            3,   58,  95,  0, 1,   28,  47,  0, 69,  142, 221, 0, 42,  122, 201, 0,
+            15,  91,  159, 0, 6,   67,  121, 0, 1,   42,  77,  0, 1,   17,  31,  0,
+            102, 148, 228, 0, 67,  117, 204, 0, 17,  82,  154, 0, 6,   59,  114, 0,
+            2,   39,  75,  0, 1,   15,  29,  0, 156, 57,  233, 0, 119, 57,  212, 0,
+            58,  48,  163, 0, 29,  40,  124, 0, 12,  30,  81,  0, 3,   12,  31,  0,
+            191, 107, 226, 0, 124, 117, 204, 0, 25,  99,  155, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 29,  148, 210, 0, 37,  126, 194, 0,
+            8,   93,  157, 0, 2,   68,  118, 0, 1,   39,  69,  0, 1,   17,  33,  0,
+            41,  151, 213, 0, 27,  123, 193, 0, 3,   82,  144, 0, 1,   58,  105, 0,
+            1,   32,  60,  0, 1,   13,  26,  0, 59,  159, 220, 0, 23,  126, 198, 0,
+            4,   88,  151, 0, 1,   66,  114, 0, 1,   38,  71,  0, 1,   18,  34,  0,
+            114, 136, 232, 0, 51,  114, 207, 0, 11,  83,  155, 0, 3,   56,  105, 0,
+            1,   33,  65,  0, 1,   17,  34,  0, 149, 65,  234, 0, 121, 57,  215, 0,
+            61,  49,  166, 0, 28,  36,  114, 0, 12,  25,  76,  0, 3,   16,  42,  0,
+            214, 49,  220, 0, 132, 63,  188, 0, 42,  65,  137, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 85,  137, 221, 0, 104, 131, 216, 0,
+            49,  111, 192, 0, 21,  87,  155, 0, 2,   49,  87,  0, 1,   16,  28,  0,
+            89,  163, 230, 0, 90,  137, 220, 0, 29,  100, 183, 0, 10,  70,  135, 0,
+            2,   42,  81,  0, 1,   17,  33,  0, 108, 167, 237, 0, 55,  133, 222, 0,
+            15,  97,  179, 0, 4,   72,  135, 0, 1,   45,  85,  0, 1,   19,  38,  0,
+            124, 146, 240, 0, 66,  124, 224, 0, 17,  88,  175, 0, 4,   58,  122, 0,
+            1,   36,  75,  0, 1,   18,  37,  0, 141, 79,  241, 0, 126, 70,  227, 0,
+            66,  58,  182, 0, 30,  44,  136, 0, 12,  34,  96,  0, 2,   20,  47,  0,
+            229, 99,  249, 0, 143, 111, 235, 0, 46,  109, 192, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 82,  158, 236, 0, 94,  146, 224, 0,
+            25,  117, 191, 0, 9,   87,  149, 0, 3,   56,  99,  0, 1,   33,  57,  0,
+            83,  167, 237, 0, 68,  145, 222, 0, 10,  103, 177, 0, 2,   72,  131, 0,
+            1,   41,  79,  0, 1,   20,  39,  0, 99,  167, 239, 0, 47,  141, 224, 0,
+            10,  104, 178, 0, 2,   73,  133, 0, 1,   44,  85,  0, 1,   22,  47,  0,
+            127, 145, 243, 0, 71,  129, 228, 0, 17,  93,  177, 0, 3,   61,  124, 0,
+            1,   41,  84,  0, 1,   21,  52,  0, 157, 78,  244, 0, 140, 72,  231, 0,
+            69,  58,  184, 0, 31,  44,  137, 0, 14,  38,  105, 0, 8,   23,  61,  0,
+            125, 34,  187, 0, 52,  41,  133, 0, 6,   31,  56,  0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 37,  109, 153, 0, 51,  102, 147, 0,
+            23,  87,  128, 0, 8,   67,  101, 0, 1,   41,  63,  0, 1,   19,  29,  0,
+            31,  154, 185, 0, 17,  127, 175, 0, 6,   96,  145, 0, 2,   73,  114, 0,
+            1,   51,  82,  0, 1,   28,  45,  0, 23,  163, 200, 0, 10,  131, 185, 0,
+            2,   93,  148, 0, 1,   67,  111, 0, 1,   41,  69,  0, 1,   14,  24,  0,
+            29,  176, 217, 0, 12,  145, 201, 0, 3,   101, 156, 0, 1,   69,  111, 0,
+            1,   39,  63,  0, 1,   14,  23,  0, 57,  192, 233, 0, 25,  154, 215, 0,
+            6,   109, 167, 0, 3,   78,  118, 0, 1,   48,  69,  0, 1,   21,  29,  0,
+            202, 105, 245, 0, 108, 106, 216, 0, 18,  90,  144, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 33,  172, 219, 0, 64,  149, 206, 0,
+            14,  117, 177, 0, 5,   90,  141, 0, 2,   61,  95,  0, 1,   37,  57,  0,
+            33,  179, 220, 0, 11,  140, 198, 0, 1,   89,  148, 0, 1,   60,  104, 0,
+            1,   33,  57,  0, 1,   12,  21,  0, 30,  181, 221, 0, 8,   141, 198, 0,
+            1,   87,  145, 0, 1,   58,  100, 0, 1,   31,  55,  0, 1,   12,  20,  0,
+            32,  186, 224, 0, 7,   142, 198, 0, 1,   86,  143, 0, 1,   58,  100, 0,
+            1,   31,  55,  0, 1,   12,  22,  0, 57,  192, 227, 0, 20,  143, 204, 0,
+            3,   96,  154, 0, 1,   68,  112, 0, 1,   42,  69,  0, 1,   19,  32,  0,
+            212, 35,  215, 0, 113, 47,  169, 0, 29,  48,  105, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 74,  129, 203, 0, 106, 120, 203, 0,
+            49,  107, 178, 0, 19,  84,  144, 0, 4,   50,  84,  0, 1,   15,  25,  0,
+            71,  172, 217, 0, 44,  141, 209, 0, 15,  102, 173, 0, 6,   76,  133, 0,
+            2,   51,  89,  0, 1,   24,  42,  0, 64,  185, 231, 0, 31,  148, 216, 0,
+            8,   103, 175, 0, 3,   74,  131, 0, 1,   46,  81,  0, 1,   18,  30,  0,
+            65,  196, 235, 0, 25,  157, 221, 0, 5,   105, 174, 0, 1,   67,  120, 0,
+            1,   38,  69,  0, 1,   15,  30,  0, 65,  204, 238, 0, 30,  156, 224, 0,
+            7,   107, 177, 0, 2,   70,  124, 0, 1,   42,  73,  0, 1,   18,  34,  0,
+            225, 86,  251, 0, 144, 104, 235, 0, 42,  99,  181, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 85,  175, 239, 0, 112, 165, 229, 0,
+            29,  136, 200, 0, 12,  103, 162, 0, 6,   77,  123, 0, 2,   53,  84,  0,
+            75,  183, 239, 0, 30,  155, 221, 0, 3,   106, 171, 0, 1,   74,  128, 0,
+            1,   44,  76,  0, 1,   17,  28,  0, 73,  185, 240, 0, 27,  159, 222, 0,
+            2,   107, 172, 0, 1,   75,  127, 0, 1,   42,  73,  0, 1,   17,  29,  0,
+            62,  190, 238, 0, 21,  159, 222, 0, 2,   107, 172, 0, 1,   72,  122, 0,
+            1,   40,  71,  0, 1,   18,  32,  0, 61,  199, 240, 0, 27,  161, 226, 0,
+            4,   113, 180, 0, 1,   76,  129, 0, 1,   46,  80,  0, 1,   23,  41,  0,
+            7,   27,  153, 0, 5,   30,  95,  0, 1,   16,  30,  0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 50,  75,  127, 0, 57,  75,  124, 0,
+            27,  67,  108, 0, 10,  54,  86,  0, 1,   33,  52,  0, 1,   12,  18,  0,
+            43,  125, 151, 0, 26,  108, 148, 0, 7,   83,  122, 0, 2,   59,  89,  0,
+            1,   38,  60,  0, 1,   17,  27,  0, 23,  144, 163, 0, 13,  112, 154, 0,
+            2,   75,  117, 0, 1,   50,  81,  0, 1,   31,  51,  0, 1,   14,  23,  0,
+            18,  162, 185, 0, 6,   123, 171, 0, 1,   78,  125, 0, 1,   51,  86,  0,
+            1,   31,  54,  0, 1,   14,  23,  0, 15,  199, 227, 0, 3,   150, 204, 0,
+            1,   91,  146, 0, 1,   55,  95,  0, 1,   30,  53,  0, 1,   11,  20,  0,
+            19,  55,  240, 0, 19,  59,  196, 0, 3,   52,  105, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 41,  166, 207, 0, 104, 153, 199, 0,
+            31,  123, 181, 0, 14,  101, 152, 0, 5,   72,  106, 0, 1,   36,  52,  0,
+            35,  176, 211, 0, 12,  131, 190, 0, 2,   88,  144, 0, 1,   60,  101, 0,
+            1,   36,  60,  0, 1,   16,  28,  0, 28,  183, 213, 0, 8,   134, 191, 0,
+            1,   86,  142, 0, 1,   56,  96,  0, 1,   30,  53,  0, 1,   12,  20,  0,
+            20,  190, 215, 0, 4,   135, 192, 0, 1,   84,  139, 0, 1,   53,  91,  0,
+            1,   28,  49,  0, 1,   11,  20,  0, 13,  196, 216, 0, 2,   137, 192, 0,
+            1,   86,  143, 0, 1,   57,  99,  0, 1,   32,  56,  0, 1,   13,  24,  0,
+            211, 29,  217, 0, 96,  47,  156, 0, 22,  43,  87,  0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 78,  120, 193, 0, 111, 116, 186, 0,
+            46,  102, 164, 0, 15,  80,  128, 0, 2,   49,  76,  0, 1,   18,  28,  0,
+            71,  161, 203, 0, 42,  132, 192, 0, 10,  98,  150, 0, 3,   69,  109, 0,
+            1,   44,  70,  0, 1,   18,  29,  0, 57,  186, 211, 0, 30,  140, 196, 0,
+            4,   93,  146, 0, 1,   62,  102, 0, 1,   38,  65,  0, 1,   16,  27,  0,
+            47,  199, 217, 0, 14,  145, 196, 0, 1,   88,  142, 0, 1,   57,  98,  0,
+            1,   36,  62,  0, 1,   15,  26,  0, 26,  219, 229, 0, 5,   155, 207, 0,
+            1,   94,  151, 0, 1,   60,  104, 0, 1,   36,  62,  0, 1,   16,  28,  0,
+            233, 29,  248, 0, 146, 47,  220, 0, 43,  52,  140, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 100, 163, 232, 0, 179, 161, 222, 0,
+            63,  142, 204, 0, 37,  113, 174, 0, 26,  89,  137, 0, 18,  68,  97,  0,
+            85,  181, 230, 0, 32,  146, 209, 0, 7,   100, 164, 0, 3,   71,  121, 0,
+            1,   45,  77,  0, 1,   18,  30,  0, 65,  187, 230, 0, 20,  148, 207, 0,
+            2,   97,  159, 0, 1,   68,  116, 0, 1,   40,  70,  0, 1,   14,  29,  0,
+            40,  194, 227, 0, 8,   147, 204, 0, 1,   94,  155, 0, 1,   65,  112, 0,
+            1,   39,  66,  0, 1,   14,  26,  0, 16,  208, 228, 0, 3,   151, 207, 0,
+            1,   98,  160, 0, 1,   67,  117, 0, 1,   41,  74,  0, 1,   17,  31,  0,
+            17,  38,  140, 0, 7,   34,  80,  0, 1,   17,  29,  0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 37,  75,  128, 0, 41,  76,  128, 0,
+            26,  66,  116, 0, 12,  52,  94,  0, 2,   32,  55,  0, 1,   10,  16,  0,
+            50,  127, 154, 0, 37,  109, 152, 0, 16,  82,  121, 0, 5,   59,  85,  0,
+            1,   35,  54,  0, 1,   13,  20,  0, 40,  142, 167, 0, 17,  110, 157, 0,
+            2,   71,  112, 0, 1,   44,  72,  0, 1,   27,  45,  0, 1,   11,  17,  0,
+            30,  175, 188, 0, 9,   124, 169, 0, 1,   74,  116, 0, 1,   48,  78,  0,
+            1,   30,  49,  0, 1,   11,  18,  0, 10,  222, 223, 0, 2,   150, 194, 0,
+            1,   83,  128, 0, 1,   48,  79,  0, 1,   27,  45,  0, 1,   11,  17,  0,
+            36,  41,  235, 0, 29,  36,  193, 0, 10,  27,  111, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 85,  165, 222, 0, 177, 162, 215, 0,
+            110, 135, 195, 0, 57,  113, 168, 0, 23,  83,  120, 0, 10,  49,  61,  0,
+            85,  190, 223, 0, 36,  139, 200, 0, 5,   90,  146, 0, 1,   60,  103, 0,
+            1,   38,  65,  0, 1,   18,  30,  0, 72,  202, 223, 0, 23,  141, 199, 0,
+            2,   86,  140, 0, 1,   56,  97,  0, 1,   36,  61,  0, 1,   16,  27,  0,
+            55,  218, 225, 0, 13,  145, 200, 0, 1,   86,  141, 0, 1,   57,  99,  0,
+            1,   35,  61,  0, 1,   13,  22,  0, 15,  235, 212, 0, 1,   132, 184, 0,
+            1,   84,  139, 0, 1,   57,  97,  0, 1,   34,  56,  0, 1,   14,  23,  0,
+            181, 21,  201, 0, 61,  37,  123, 0, 10,  38,  71,  0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 47,  106, 172, 0, 95,  104, 173, 0,
+            42,  93,  159, 0, 18,  77,  131, 0, 4,   50,  81,  0, 1,   17,  23,  0,
+            62,  147, 199, 0, 44,  130, 189, 0, 28,  102, 154, 0, 18,  75,  115, 0,
+            2,   44,  65,  0, 1,   12,  19,  0, 55,  153, 210, 0, 24,  130, 194, 0,
+            3,   93,  146, 0, 1,   61,  97,  0, 1,   31,  50,  0, 1,   10,  16,  0,
+            49,  186, 223, 0, 17,  148, 204, 0, 1,   96,  142, 0, 1,   53,  83,  0,
+            1,   26,  44,  0, 1,   11,  17,  0, 13,  217, 212, 0, 2,   136, 180, 0,
+            1,   78,  124, 0, 1,   50,  83,  0, 1,   29,  49,  0, 1,   14,  23,  0,
+            197, 13,  247, 0, 82,  17,  222, 0, 25,  17,  162, 0, 0,   0,   0,   0,
+            0,   0,   0,   0, 0,   0,   0,   0, 126, 186, 247, 0, 234, 191, 243, 0,
+            176, 177, 234, 0, 104, 158, 220, 0, 66,  128, 186, 0, 55,  90,  137, 0,
+            111, 197, 242, 0, 46,  158, 219, 0, 9,   104, 171, 0, 2,   65,  125, 0,
+            1,   44,  80,  0, 1,   17,  91,  0, 104, 208, 245, 0, 39,  168, 224, 0,
+            3,   109, 162, 0, 1,   79,  124, 0, 1,   50,  102, 0, 1,   43,  102, 0,
+            84,  220, 246, 0, 31,  177, 231, 0, 2,   115, 180, 0, 1,   79,  134, 0,
+            1,   55,  77,  0, 1,   60,  79,  0, 43,  243, 240, 0, 8,   180, 217, 0,
+            1,   115, 166, 0, 1,   84,  121, 0, 1,   51,  67,  0, 1,   16,  6,   0
+        };
+
+        private byte[] _defaultSkipProbs = new byte[] { 192, 128, 64 };
+
+        private byte[] _defaultInterModeProbs = new byte[]
+        {
+            2, 173, 34, 0, 7,  145, 85, 0, 7,  166, 63, 0, 7, 94, 66, 0,
+            8, 64,  46, 0, 17, 81,  31, 0, 25, 29,  30, 0
+        };
+
+        private byte[] _defaultInterpFilterProbs = new byte[]
+        {
+            235, 162, 36, 255, 34, 3, 149, 144
+        };
+
+        private byte[] _defaultIsInterProbs = new byte[] { 9, 102, 187, 225 };
+
+        private byte[] _defaultCompModeProbs = new byte[] { 239, 183, 119, 96, 41 };
+
+        private byte[] _defaultSingleRefProbs = new byte[]
+        {
+            33, 16, 77, 74, 142, 142, 172, 170, 238, 247
+        };
+
+        private byte[] _defaultCompRefProbs = new byte[] { 50, 126, 123, 221, 226 };
+
+        private byte[] _defaultYModeProbs0 = new byte[]
+        {
+            65,  32, 18, 144, 162, 194, 41, 51, 132, 68,  18, 165, 217, 196, 45, 40,
+            173, 80, 19, 176, 240, 193, 64, 35, 221, 135, 38, 194, 248, 121, 96, 85
+        };
+
+        private byte[] _defaultYModeProbs1 = new byte[] { 98, 78, 46, 29 };
+
+        private byte[] _defaultPartitionProbs = new byte[]
+        {
+            199, 122, 141, 0, 147, 63,  159, 0, 148, 133, 118, 0, 121, 104, 114, 0,
+            174, 73,  87,  0, 92,  41,  83,  0, 82,  99,  50,  0, 53,  39,  39,  0,
+            177, 58,  59,  0, 68,  26,  63,  0, 52,  79,  25,  0, 17,  14,  12,  0,
+            222, 34,  30,  0, 72,  16,  44,  0, 58,  32,  12,  0, 10,  7,   6,   0
+        };
+
+        private byte[] _defaultMvJointProbs = new byte[] { 32, 64, 96 };
+
+        private byte[] _defaultMvSignProbs = new byte[] { 128, 128 };
+
+        private byte[] _defaultMvClassProbs = new byte[]
+        {
+            224, 144, 192, 168, 192, 176, 192, 198, 198, 245, 216, 128, 176, 160, 176, 176,
+            192, 198, 198, 208
+        };
+
+        private byte[] _defaultMvClass0BitProbs = new byte[] { 216, 208 };
+
+        private byte[] _defaultMvBitsProbs = new byte[]
+        {
+            136, 140, 148, 160, 176, 192, 224, 234, 234, 240, 136, 140, 148, 160, 176, 192,
+            224, 234, 234, 240
+        };
+
+        private byte[] _defaultMvClass0FrProbs = new byte[]
+        {
+            128, 128, 64, 96, 112, 64, 128, 128, 64, 96, 112, 64
+        };
+
+        private byte[] _defaultMvFrProbs = new byte[] { 64, 96, 64, 64, 96, 64 };
+
+        private byte[] _defaultMvClass0HpProbs = new byte[] { 160, 160 };
+
+        private byte[] _defaultMvHpProbs = new byte[] { 128, 128 };
+
+        private sbyte[] _loopFilterRefDeltas;
+        private sbyte[] _loopFilterModeDeltas;
+
+        private LinkedList<int> _frameSlotByLastUse;
+
+        private Dictionary<long, LinkedListNode<int>> _cachedRefFrames;
+
+        public Vp9Decoder()
+        {
+            _loopFilterRefDeltas  = new sbyte[4];
+            _loopFilterModeDeltas = new sbyte[2];
+
+            _frameSlotByLastUse = new LinkedList<int>();
+
+            for (int slot = 0; slot < 8; slot++)
+            {
+                _frameSlotByLastUse.AddFirst(slot);
+            }
+
+            _cachedRefFrames = new Dictionary<long, LinkedListNode<int>>();
+        }
+
+        public void Decode(
+            Vp9FrameKeys         keys,
+            Vp9FrameHeader       header,
+            Vp9ProbabilityTables probs,
+            byte[]               frameData)
+        {
+            bool isKeyFrame         = ((header.Flags >> 0) & 1) != 0;
+            bool lastIsKeyFrame     = ((header.Flags >> 1) & 1) != 0;
+            bool frameSizeChanged   = ((header.Flags >> 2) & 1) != 0;
+            bool errorResilientMode = ((header.Flags >> 3) & 1) != 0;
+            bool lastShowFrame      = ((header.Flags >> 4) & 1) != 0;
+            bool isFrameIntra       = ((header.Flags >> 5) & 1) != 0;
+
+            bool showFrame = !isFrameIntra;
+
+            // Write compressed header.
+            byte[] compressedHeaderData;
+
+            using (MemoryStream compressedHeader = new MemoryStream())
+            {
+                VpxRangeEncoder writer = new VpxRangeEncoder(compressedHeader);
+
+                if (!header.Lossless)
+                {
+                    if ((uint)header.TxMode >= 3)
+                    {
+                        writer.Write(3, 2);
+                        writer.Write(header.TxMode == 4);
+                    }
+                    else
+                    {
+                        writer.Write(header.TxMode, 2);
+                    }
+                }
+
+                if (header.TxMode == 4)
+                {
+                    WriteProbabilityUpdate(writer, probs.Tx8x8Probs,   DefaultTx8x8Probs);
+                    WriteProbabilityUpdate(writer, probs.Tx16x16Probs, DefaultTx16x16Probs);
+                    WriteProbabilityUpdate(writer, probs.Tx32x32Probs, DefaultTx32x32Probs);
+                }
+
+                WriteCoefProbabilityUpdate(writer, header.TxMode, probs.CoefProbs, _defaultCoefProbs);
+
+                WriteProbabilityUpdate(writer, probs.SkipProbs, _defaultSkipProbs);
+
+                if (!isFrameIntra)
+                {
+                    WriteProbabilityUpdateAligned4(writer, probs.InterModeProbs, _defaultInterModeProbs);
+
+                    if (header.RawInterpolationFilter == 4)
+                    {
+                        WriteProbabilityUpdate(writer, probs.InterpFilterProbs, _defaultInterpFilterProbs);
+                    }
+
+                    WriteProbabilityUpdate(writer, probs.IsInterProbs, _defaultIsInterProbs);
+
+                    if ((header.RefFrameSignBias[1] & 1) != (header.RefFrameSignBias[2] & 1) ||
+                        (header.RefFrameSignBias[1] & 1) != (header.RefFrameSignBias[3] & 1))
+                    {
+                        if ((uint)header.CompPredMode >= 1)
+                        {
+                            writer.Write(1, 1);
+                            writer.Write(header.CompPredMode == 2);
+                        }
+                        else
+                        {
+                            writer.Write(0, 1);
+                        }
+                    }
+
+                    if (header.CompPredMode == 2)
+                    {
+                        WriteProbabilityUpdate(writer, probs.CompModeProbs, _defaultCompModeProbs);
+                    }
+
+                    if (header.CompPredMode != 1)
+                    {
+                        WriteProbabilityUpdate(writer, probs.SingleRefProbs, _defaultSingleRefProbs);
+                    }
+
+                    if (header.CompPredMode != 0)
+                    {
+                        WriteProbabilityUpdate(writer, probs.CompRefProbs, _defaultCompRefProbs);
+                    }
+
+                    for (int index = 0; index < 4; index++)
+                    {
+                        int i = index * 8;
+                        int j = index;
+
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 0], _defaultYModeProbs0[i + 0]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 1], _defaultYModeProbs0[i + 1]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 2], _defaultYModeProbs0[i + 2]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 3], _defaultYModeProbs0[i + 3]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 4], _defaultYModeProbs0[i + 4]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 5], _defaultYModeProbs0[i + 5]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 6], _defaultYModeProbs0[i + 6]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs0[i + 7], _defaultYModeProbs0[i + 7]);
+                        WriteProbabilityUpdate(writer, probs.YModeProbs1[j + 0], _defaultYModeProbs1[j + 0]);
+                    }
+
+                    WriteProbabilityUpdateAligned4(writer, probs.PartitionProbs, _defaultPartitionProbs);
+
+                    for (int i = 0; i < 3; i++)
+                    {
+                        WriteMvProbabilityUpdate(writer, probs.MvJointProbs[i], _defaultMvJointProbs[i]);
+                    }
+
+                    for (int i = 0; i < 2; i++)
+                    {
+                        WriteMvProbabilityUpdate(writer, probs.MvSignProbs[i], _defaultMvSignProbs[i]);
+
+                        for (int j = 0; j < 10; j++)
+                        {
+                            int index = i * 10 + j;
+
+                            WriteMvProbabilityUpdate(writer, probs.MvClassProbs[index], _defaultMvClassProbs[index]);
+                        }
+
+                        WriteMvProbabilityUpdate(writer, probs.MvClass0BitProbs[i], _defaultMvClass0BitProbs[i]);
+
+                        for (int j = 0; j < 10; j++)
+                        {
+                            int index = i * 10 + j;
+
+                            WriteMvProbabilityUpdate(writer, probs.MvBitsProbs[index], _defaultMvBitsProbs[index]);
+                        }
+                    }
+
+                    for (int i = 0; i < 2; i++)
+                    {
+                        for (int j = 0; j < 2; j++)
+                        {
+                            for (int k = 0; k < 3; k++)
+                            {
+                                int index = i * 2 * 3 + j * 3 + k;
+
+                                WriteMvProbabilityUpdate(writer, probs.MvClass0FrProbs[index], _defaultMvClass0FrProbs[index]);
+                            }
+                        }
+
+                        for (int j = 0; j < 3; j++)
+                        {
+                            int index = i * 3 + j;
+
+                            WriteMvProbabilityUpdate(writer, probs.MvFrProbs[index], _defaultMvFrProbs[index]);
+                        }
+                    }
+
+                    if (header.AllowHighPrecisionMv)
+                    {
+                        for (int index = 0; index < 2; index++)
+                        {
+                            WriteMvProbabilityUpdate(writer, probs.MvClass0HpProbs[index], _defaultMvClass0HpProbs[index]);
+                            WriteMvProbabilityUpdate(writer, probs.MvHpProbs[index],       _defaultMvHpProbs[index]);
+                        }
+                    }
+                }
+
+                writer.End();
+
+                compressedHeaderData = compressedHeader.ToArray();
+            }
+
+            // Write uncompressed header.
+            using (MemoryStream encodedHeader = new MemoryStream())
+            {
+                VpxBitStreamWriter writer = new VpxBitStreamWriter(encodedHeader);
+
+                writer.WriteU(2, 2); //Frame marker.
+                writer.WriteU(0, 2); //Profile.
+                writer.WriteBit(false); //Show existing frame.
+                writer.WriteBit(!isKeyFrame);
+                writer.WriteBit(showFrame);
+                writer.WriteBit(errorResilientMode);
+
+                if (isKeyFrame)
+                {
+                    writer.WriteU(FrameSyncCode, 24);
+                    writer.WriteU(0, 3); //Color space.
+                    writer.WriteU(0, 1); //Color range.
+                    writer.WriteU(header.CurrentFrame.Width - 1, 16);
+                    writer.WriteU(header.CurrentFrame.Height - 1, 16);
+                    writer.WriteBit(false); //Render and frame size different.
+
+                    _cachedRefFrames.Clear();
+
+                    // On key frames, all frame slots are set to the current frame,
+                    // so the value of the selected slot doesn't really matter.
+                    GetNewFrameSlot(keys.CurrKey);
+                }
+                else
+                {
+                    if (!showFrame)
+                    {
+                        writer.WriteBit(isFrameIntra);
+                    }
+
+                    if (!errorResilientMode)
+                    {
+                        writer.WriteU(0, 2); //Reset frame context.
+                    }
+
+                    int refreshFrameFlags = 1 << GetNewFrameSlot(keys.CurrKey);
+
+                    if (isFrameIntra)
+                    {
+                        writer.WriteU(FrameSyncCode, 24);
+                        writer.WriteU(refreshFrameFlags, 8);
+                        writer.WriteU(header.CurrentFrame.Width - 1, 16);
+                        writer.WriteU(header.CurrentFrame.Height - 1, 16);
+                        writer.WriteBit(false); //Render and frame size different.
+                    }
+                    else
+                    {
+                        writer.WriteU(refreshFrameFlags, 8);
+
+                        int[] refFrameIndex = new int[]
+                        {
+                            GetFrameSlot(keys.Ref0Key),
+                            GetFrameSlot(keys.Ref1Key),
+                            GetFrameSlot(keys.Ref2Key)
+                        };
+
+                        byte[] refFrameSignBias = header.RefFrameSignBias;
+
+                        for (int index = 1; index < 4; index++)
+                        {
+                            writer.WriteU(refFrameIndex[index - 1], 3);
+                            writer.WriteU(refFrameSignBias[index], 1);
+                        }
+
+                        writer.WriteBit(true); //Frame size with refs.
+                        writer.WriteBit(false); //Render and frame size different.
+                        writer.WriteBit(header.AllowHighPrecisionMv);
+                        writer.WriteBit(header.RawInterpolationFilter == 4);
+
+                        if (header.RawInterpolationFilter != 4)
+                        {
+                            writer.WriteU(header.RawInterpolationFilter, 2);
+                        }
+                    }
+                }
+
+                if (!errorResilientMode)
+                {
+                    writer.WriteBit(false); //Refresh frame context.
+                    writer.WriteBit(true); //Frame parallel decoding mode.
+                }
+
+                writer.WriteU(0, 2); //Frame context index.
+
+                writer.WriteU(header.LoopFilterLevel, 6);
+                writer.WriteU(header.LoopFilterSharpness, 3);
+                writer.WriteBit(header.LoopFilterDeltaEnabled);
+
+                if (header.LoopFilterDeltaEnabled)
+                {
+                    bool[] updateLoopFilterRefDeltas  = new bool[4];
+                    bool[] updateLoopFilterModeDeltas = new bool[2];
+
+                    bool loopFilterDeltaUpdate = false;
+
+                    for (int index = 0; index < header.LoopFilterRefDeltas.Length; index++)
+                    {
+                        sbyte old =        _loopFilterRefDeltas[index];
+                        sbyte New = header.LoopFilterRefDeltas[index];
+
+                        loopFilterDeltaUpdate |= (updateLoopFilterRefDeltas[index] = old != New);
+                    }
+
+                    for (int index = 0; index < header.LoopFilterModeDeltas.Length; index++)
+                    {
+                        sbyte old =        _loopFilterModeDeltas[index];
+                        sbyte New = header.LoopFilterModeDeltas[index];
+
+                        loopFilterDeltaUpdate |= (updateLoopFilterModeDeltas[index] = old != New);
+                    }
+
+                    writer.WriteBit(loopFilterDeltaUpdate);
+
+                    if (loopFilterDeltaUpdate)
+                    {
+                        for (int index = 0; index < header.LoopFilterRefDeltas.Length; index++)
+                        {
+                            writer.WriteBit(updateLoopFilterRefDeltas[index]);
+
+                            if (updateLoopFilterRefDeltas[index])
+                            {
+                                writer.WriteS(header.LoopFilterRefDeltas[index], 6);
+                            }
+                        }
+
+                        for (int index = 0; index < header.LoopFilterModeDeltas.Length; index++)
+                        {
+                            writer.WriteBit(updateLoopFilterModeDeltas[index]);
+
+                            if (updateLoopFilterModeDeltas[index])
+                            {
+                                writer.WriteS(header.LoopFilterModeDeltas[index], 6);
+                            }
+                        }
+                    }
+                }
+
+                writer.WriteU(header.BaseQIndex, 8);
+
+                writer.WriteDeltaQ(header.DeltaQYDc);
+                writer.WriteDeltaQ(header.DeltaQUvDc);
+                writer.WriteDeltaQ(header.DeltaQUvAc);
+
+                writer.WriteBit(false); //Segmentation enabled (TODO).
+
+                int minTileColsLog2 = CalcMinLog2TileCols(header.CurrentFrame.Width);
+                int maxTileColsLog2 = CalcMaxLog2TileCols(header.CurrentFrame.Width);
+
+                int tileColsLog2Diff = header.TileColsLog2 - minTileColsLog2;
+
+                int tileColsLog2IncMask = (1 << tileColsLog2Diff) - 1;
+
+                // If it's less than the maximum, we need to add an extra 0 on the bitstream
+                // to indicate that it should stop reading.
+                if (header.TileColsLog2 < maxTileColsLog2)
+                {
+                    writer.WriteU(tileColsLog2IncMask << 1, tileColsLog2Diff + 1);
+                }
+                else
+                {
+                    writer.WriteU(tileColsLog2IncMask, tileColsLog2Diff);
+                }
+
+                bool tileRowsLog2IsNonZero = header.TileRowsLog2 != 0;
+
+                writer.WriteBit(tileRowsLog2IsNonZero);
+
+                if (tileRowsLog2IsNonZero)
+                {
+                    writer.WriteBit(header.TileRowsLog2 > 1);
+                }
+
+                writer.WriteU(compressedHeaderData.Length, 16);
+
+                writer.Flush();
+
+                encodedHeader.Write(compressedHeaderData, 0, compressedHeaderData.Length);
+
+                if (!FFmpegWrapper.IsInitialized)
+                {
+                    FFmpegWrapper.Vp9Initialize();
+                }
+
+                FFmpegWrapper.DecodeFrame(DecoderHelper.Combine(encodedHeader.ToArray(), frameData));
+            }
+
+            _loopFilterRefDeltas  = header.LoopFilterRefDeltas;
+            _loopFilterModeDeltas = header.LoopFilterModeDeltas;
+        }
+
+        private int GetNewFrameSlot(long key)
+        {
+            LinkedListNode<int> node = _frameSlotByLastUse.Last;
+
+            _frameSlotByLastUse.RemoveLast();
+            _frameSlotByLastUse.AddFirst(node);
+
+            _cachedRefFrames[key] = node;
+
+            return node.Value;
+        }
+
+        private int GetFrameSlot(long key)
+        {
+            if (_cachedRefFrames.TryGetValue(key, out LinkedListNode<int> node))
+            {
+                _frameSlotByLastUse.Remove(node);
+                _frameSlotByLastUse.AddFirst(node);
+
+                return node.Value;
+            }
+
+            // Reference frame was lost.
+            // What we should do in this case?
+            return 0;
+        }
+
+        private void WriteProbabilityUpdate(VpxRangeEncoder writer, byte[] New, byte[] old)
+        {
+            for (int offset = 0; offset < New.Length; offset++)
+            {
+                WriteProbabilityUpdate(writer, New[offset], old[offset]);
+            }
+        }
+
+        private void WriteCoefProbabilityUpdate(VpxRangeEncoder writer, int txMode, byte[] New, byte[] old)
+        {
+            // Note: There's 1 byte added on each packet for alignment,
+            // this byte is ignored when doing updates.
+            const int blockBytes = 2 * 2 * 6 * 6 * 4;
+
+            bool NeedsUpdate(int baseIndex)
+            {
+                int index = baseIndex;
+
+                for (int i = 0; i < 2; i++)
+                for (int j = 0; j < 2; j++)
+                for (int k = 0; k < 6; k++)
+                for (int l = 0; l < 6; l++)
+                {
+                    if (New[index + 0] != old[index + 0] ||
+                        New[index + 1] != old[index + 1] ||
+                        New[index + 2] != old[index + 2])
+                    {
+                        return true;
+                    }
+
+                    index += 4;
+                }
+
+                return false;
+            }
+
+            for (int blockIndex = 0; blockIndex < 4; blockIndex++)
+            {
+                int baseIndex = blockIndex * blockBytes;
+
+                bool update = NeedsUpdate(baseIndex);
+
+                writer.Write(update);
+
+                if (update)
+                {
+                    int index = baseIndex;
+
+                    for (int i = 0; i < 2; i++)
+                    for (int j = 0; j < 2; j++)
+                    for (int k = 0; k < 6; k++)
+                    for (int l = 0; l < 6; l++)
+                    {
+                        if (k != 0 || l < 3)
+                        {
+                            WriteProbabilityUpdate(writer, New[index + 0], old[index + 0]);
+                            WriteProbabilityUpdate(writer, New[index + 1], old[index + 1]);
+                            WriteProbabilityUpdate(writer, New[index + 2], old[index + 2]);
+                        }
+
+                        index += 4;
+                    }
+                }
+
+                if (blockIndex == txMode)
+                {
+                    break;
+                }
+            }
+        }
+
+        private void WriteProbabilityUpdateAligned4(VpxRangeEncoder writer, byte[] New, byte[] old)
+        {
+            for (int offset = 0; offset < New.Length; offset += 4)
+            {
+                WriteProbabilityUpdate(writer, New[offset + 0], old[offset + 0]);
+                WriteProbabilityUpdate(writer, New[offset + 1], old[offset + 1]);
+                WriteProbabilityUpdate(writer, New[offset + 2], old[offset + 2]);
+            }
+        }
+
+        private void WriteProbabilityUpdate(VpxRangeEncoder writer, byte New, byte old)
+        {
+            bool update = New != old;
+
+            writer.Write(update, DiffUpdateProbability);
+
+            if (update)
+            {
+                WriteProbabilityDelta(writer, New, old);
+            }
+        }
+
+        private void WriteProbabilityDelta(VpxRangeEncoder writer, int New, int old)
+        {
+            int delta = RemapProbability(New, old);
+
+            EncodeTermSubExp(writer, delta);
+        }
+
+        private int RemapProbability(int New, int old)
+        {
+            New--;
+            old--;
+
+            int index;
+
+            if (old * 2 <= 0xff)
+            {
+                index = RecenterNonNeg(New, old) - 1;
+            }
+            else
+            {
+                index = RecenterNonNeg(0xff - 1 - New, 0xff - 1 - old) - 1;
+            }
+
+            return MapLut[index];
+        }
+
+        private int RecenterNonNeg(int New, int old)
+        {
+            if (New > old * 2)
+            {
+                return New;
+            }
+            else if (New >= old)
+            {
+                return (New - old) * 2;
+            }
+            else /* if (New < Old) */
+            {
+                return (old - New) * 2 - 1;
+            }
+        }
+
+        private void EncodeTermSubExp(VpxRangeEncoder writer, int value)
+        {
+            if (WriteLessThan(writer, value, 16))
+            {
+                writer.Write(value, 4);
+            }
+            else if (WriteLessThan(writer, value, 32))
+            {
+                writer.Write(value - 16, 4);
+            }
+            else if (WriteLessThan(writer, value, 64))
+            {
+                writer.Write(value - 32, 5);
+            }
+            else
+            {
+                value -= 64;
+
+                const int size = 8;
+
+                int mask = (1 << size) - 191;
+
+                int delta = value - mask;
+
+                if (delta < 0)
+                {
+                    writer.Write(value, size - 1);
+                }
+                else
+                {
+                    writer.Write(delta / 2 + mask, size - 1);
+                    writer.Write(delta & 1, 1);
+                }
+            }
+        }
+
+        private bool WriteLessThan(VpxRangeEncoder writer, int value, int test)
+        {
+            bool isLessThan = value < test;
+
+            writer.Write(!isLessThan);
+
+            return isLessThan;
+        }
+
+        private void WriteMvProbabilityUpdate(VpxRangeEncoder writer, byte New, byte old)
+        {
+            bool update = New != old;
+
+            writer.Write(update, DiffUpdateProbability);
+
+            if (update)
+            {
+                writer.Write(New >> 1, 7);
+            }
+        }
+
+        private static int CalcMinLog2TileCols(int frameWidth)
+        {
+            int sb64Cols = (frameWidth + 63) / 64;
+            int minLog2  = 0;
+
+            while ((64 << minLog2) < sb64Cols)
+            {
+                minLog2++;
+            }
+
+            return minLog2;
+        }
+
+        private static int CalcMaxLog2TileCols(int frameWidth)
+        {
+            int sb64Cols = (frameWidth + 63) / 64;
+            int maxLog2  = 1;
+
+            while ((sb64Cols >> maxLog2) >= 4)
+            {
+                maxLog2++;
+            }
+
+            return maxLog2 - 1;
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/Vp9FrameHeader.cs

@@ -0,0 +1,79 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.VDec
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 2)]
+    struct Vp9FrameDimensions
+    {
+        public short Width;
+        public short Height;
+        public short SubsamplingX; //?
+        public short SubsamplingY; //?
+    }
+
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    struct Vp9FrameHeader
+    {
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
+        public Vp9FrameDimensions[] RefFrames;
+
+        public Vp9FrameDimensions CurrentFrame;
+
+        public int Flags;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
+        public byte[] RefFrameSignBias;
+
+        public byte LoopFilterLevel;
+        public byte LoopFilterSharpness;
+
+        public byte  BaseQIndex;
+        public sbyte DeltaQYDc;
+        public sbyte DeltaQUvDc;
+        public sbyte DeltaQUvAc;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool Lossless;
+
+        public byte TxMode;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool AllowHighPrecisionMv;
+
+        public byte RawInterpolationFilter;
+        public byte CompPredMode;
+        public byte FixCompRef;
+        public byte VarCompRef0;
+        public byte VarCompRef1;
+
+        public byte TileColsLog2;
+        public byte TileRowsLog2;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool SegmentationEnabled;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool SegmentationUpdate;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool SegmentationTemporalUpdate;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool SegmentationAbsOrDeltaUpdate;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8 * 4, ArraySubType = UnmanagedType.I1)]
+        public bool[] FeatureEnabled;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8 * 4)]
+        public short[] FeatureData;
+
+        [MarshalAs(UnmanagedType.I1)]
+        public bool LoopFilterDeltaEnabled;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
+        public sbyte[] LoopFilterRefDeltas;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
+        public sbyte[] LoopFilterModeDeltas;
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/Vp9FrameKeys.cs

@@ -0,0 +1,10 @@
+namespace Ryujinx.Graphics.VDec
+{
+    struct Vp9FrameKeys
+    {
+        public long CurrKey;
+        public long Ref0Key;
+        public long Ref1Key;
+        public long Ref2Key;
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/Vp9ProbabilityTables.cs

@@ -0,0 +1,31 @@
+namespace Ryujinx.Graphics.VDec
+{
+    struct Vp9ProbabilityTables
+    {
+        public byte[] SegmentationTreeProbs;
+        public byte[] SegmentationPredProbs;
+        public byte[] Tx8x8Probs;
+        public byte[] Tx16x16Probs;
+        public byte[] Tx32x32Probs;
+        public byte[] CoefProbs;
+        public byte[] SkipProbs;
+        public byte[] InterModeProbs;
+        public byte[] InterpFilterProbs;
+        public byte[] IsInterProbs;
+        public byte[] CompModeProbs;
+        public byte[] SingleRefProbs;
+        public byte[] CompRefProbs;
+        public byte[] YModeProbs0;
+        public byte[] YModeProbs1;
+        public byte[] PartitionProbs;
+        public byte[] MvJointProbs;
+        public byte[] MvSignProbs;
+        public byte[] MvClassProbs;
+        public byte[] MvClass0BitProbs;
+        public byte[] MvBitsProbs;
+        public byte[] MvClass0FrProbs;
+        public byte[] MvFrProbs;
+        public byte[] MvClass0HpProbs;
+        public byte[] MvHpProbs;
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/VpxBitStreamWriter.cs

@@ -0,0 +1,38 @@
+using System.IO;
+
+namespace Ryujinx.Graphics.VDec
+{
+    class VpxBitStreamWriter : BitStreamWriter
+    {
+        public VpxBitStreamWriter(Stream baseStream) : base(baseStream) { }
+
+        public void WriteU(int value, int valueSize)
+        {
+            WriteBits(value, valueSize);
+        }
+
+        public void WriteS(int value, int valueSize)
+        {
+            bool sign = value < 0;
+
+            if (sign)
+            {
+                value = -value;
+            }
+
+            WriteBits((value << 1) | (sign ? 1 : 0), valueSize + 1);
+        }
+
+        public void WriteDeltaQ(int value)
+        {
+            bool deltaCoded = value != 0;
+
+            WriteBit(deltaCoded);
+
+            if (deltaCoded)
+            {
+                WriteBits(value, 4);
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/VDec/VpxRangeEncoder.cs

@@ -0,0 +1,134 @@
+using System.IO;
+
+namespace Ryujinx.Graphics.VDec
+{
+    class VpxRangeEncoder
+    {
+        private const int HalfProbability = 128;
+
+        private static readonly int[] NormLut = new int[]
+        {
+            0, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
+            3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+            2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+            2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+        };
+
+        private Stream _baseStream;
+
+        private uint _lowValue;
+        private uint _range;
+        private int  _count;
+
+        public VpxRangeEncoder(Stream baseStream)
+        {
+            _baseStream = baseStream;
+
+            _range = 0xff;
+            _count = -24;
+
+            Write(false);
+        }
+
+        public void WriteByte(byte value)
+        {
+            Write(value, 8);
+        }
+
+        public void Write(int value, int valueSize)
+        {
+            for (int bit = valueSize - 1; bit >= 0; bit--)
+            {
+                Write(((value >> bit) & 1) != 0);
+            }
+        }
+
+        public void Write(bool bit)
+        {
+            Write(bit, HalfProbability);
+        }
+
+        public void Write(bool bit, int probability)
+        {
+            uint range = _range;
+
+            uint split = 1 + (((range - 1) * (uint)probability) >> 8);
+
+            range = split;
+
+            if (bit)
+            {
+                _lowValue += split;
+                range      = _range - split;
+            }
+
+            int shift = NormLut[range];
+
+            range  <<= shift;
+            _count  += shift;
+
+            if (_count >= 0)
+            {
+                int offset = shift - _count;
+
+                if (((_lowValue << (offset - 1)) >> 31) != 0)
+                {
+                    long currentPos = _baseStream.Position;
+
+                    _baseStream.Seek(-1, SeekOrigin.Current);
+
+                    while (_baseStream.Position >= 0 && PeekByte() == 0xff)
+                    {
+                        _baseStream.WriteByte(0);
+
+                        _baseStream.Seek(-2, SeekOrigin.Current);
+                    }
+
+                    _baseStream.WriteByte((byte)(PeekByte() + 1));
+
+                    _baseStream.Seek(currentPos, SeekOrigin.Begin);
+                }
+
+                _baseStream.WriteByte((byte)(_lowValue >> (24 - offset)));
+
+                _lowValue <<= offset;
+                shift       = _count;
+                _lowValue  &= 0xffffff;
+                _count     -= 8;
+            }
+
+            _lowValue <<= shift;
+
+            _range = range;
+        }
+
+        private byte PeekByte()
+        {
+            byte value = (byte)_baseStream.ReadByte();
+
+            _baseStream.Seek(-1, SeekOrigin.Current);
+
+            return value;
+        }
+
+        public void End()
+        {
+            for (int index = 0; index < 32; index++)
+            {
+                Write(false);
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/Vic/StructUnpacker.cs

@@ -0,0 +1,69 @@
+using Ryujinx.Graphics.Gpu.Memory;
+using System;
+
+namespace Ryujinx.Graphics.Vic
+{
+    class StructUnpacker
+    {
+        private MemoryAccessor _vmm;
+
+        private ulong _position;
+
+        private ulong _buffer;
+        private int   _buffPos;
+
+        public StructUnpacker(MemoryAccessor vmm, ulong position)
+        {
+            _vmm      = vmm;
+            _position = position;
+
+            _buffPos = 64;
+        }
+
+        public int Read(int bits)
+        {
+            if ((uint)bits > 32)
+            {
+                throw new ArgumentOutOfRangeException(nameof(bits));
+            }
+
+            int value = 0;
+
+            while (bits > 0)
+            {
+                RefillBufferIfNeeded();
+
+                int readBits = bits;
+
+                int maxReadBits = 64 - _buffPos;
+
+                if (readBits > maxReadBits)
+                {
+                    readBits = maxReadBits;
+                }
+
+                value <<= readBits;
+
+                value |= (int)(_buffer >> _buffPos) & (int)(0xffffffff >> (32 - readBits));
+
+                _buffPos += readBits;
+
+                bits -= readBits;
+            }
+
+            return value;
+        }
+
+        private void RefillBufferIfNeeded()
+        {
+            if (_buffPos >= 64)
+            {
+                _buffer = _vmm.ReadUInt64(_position);
+
+                _position += 8;
+
+                _buffPos = 0;
+            }
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/Vic/SurfaceOutputConfig.cs

@@ -0,0 +1,33 @@
+namespace Ryujinx.Graphics.Vic
+{
+    struct SurfaceOutputConfig
+    {
+        public SurfacePixelFormat PixelFormat;
+
+        public int SurfaceWidth;
+        public int SurfaceHeight;
+        public int GobBlockHeight;
+
+        public ulong SurfaceLumaAddress;
+        public ulong SurfaceChromaUAddress;
+        public ulong SurfaceChromaVAddress;
+
+        public SurfaceOutputConfig(
+            SurfacePixelFormat pixelFormat,
+            int                surfaceWidth,
+            int                surfaceHeight,
+            int                gobBlockHeight,
+            ulong              outputSurfaceLumaAddress,
+            ulong              outputSurfaceChromaUAddress,
+            ulong              outputSurfaceChromaVAddress)
+        {
+            PixelFormat           = pixelFormat;
+            SurfaceWidth          = surfaceWidth;
+            SurfaceHeight         = surfaceHeight;
+            GobBlockHeight        = gobBlockHeight;
+            SurfaceLumaAddress    = outputSurfaceLumaAddress;
+            SurfaceChromaUAddress = outputSurfaceChromaUAddress;
+            SurfaceChromaVAddress = outputSurfaceChromaVAddress;
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/Vic/SurfacePixelFormat.cs

@@ -0,0 +1,8 @@
+namespace Ryujinx.Graphics.Vic
+{
+    enum SurfacePixelFormat
+    {
+        Rgba8   = 0x1f,
+        Yuv420P = 0x44
+    }
+}

Ryujinx.Graphics.Nvdec/Vic/VideoImageComposer.cs

@@ -0,0 +1,94 @@
+using Ryujinx.Graphics.Gpu;
+using Ryujinx.Graphics.VDec;
+
+namespace Ryujinx.Graphics.Vic
+{
+    class VideoImageComposer
+    {
+        private ulong _configStructAddress;
+        private ulong _outputSurfaceLumaAddress;
+        private ulong _outputSurfaceChromaUAddress;
+        private ulong _outputSurfaceChromaVAddress;
+
+        private VideoDecoder _vdec;
+
+        public VideoImageComposer(VideoDecoder vdec)
+        {
+            _vdec = vdec;
+        }
+
+        public void Process(GpuContext gpu, int methodOffset, int[] arguments)
+        {
+            VideoImageComposerMeth method = (VideoImageComposerMeth)methodOffset;
+
+            switch (method)
+            {
+                case VideoImageComposerMeth.Execute: Execute(gpu); break;
+                case VideoImageComposerMeth.SetConfigStructOffset: SetConfigStructOffset(arguments); break;
+                case VideoImageComposerMeth.SetOutputSurfaceLumaOffset: SetOutputSurfaceLumaOffset(arguments); break;
+                case VideoImageComposerMeth.SetOutputSurfaceChromaUOffset: SetOutputSurfaceChromaUOffset(arguments); break;
+                case VideoImageComposerMeth.SetOutputSurfaceChromaVOffset: SetOutputSurfaceChromaVOffset(arguments); break;
+            }
+        }
+
+        private void Execute(GpuContext gpu)
+        {
+            StructUnpacker unpacker = new StructUnpacker(gpu.MemoryAccessor, _configStructAddress + 0x20);
+
+            SurfacePixelFormat pixelFormat = (SurfacePixelFormat)unpacker.Read(7);
+
+            int chromaLocHoriz = unpacker.Read(2);
+            int chromaLocVert  = unpacker.Read(2);
+
+            int blockLinearKind       = unpacker.Read(4);
+            int blockLinearHeightLog2 = unpacker.Read(4);
+
+            int reserved0 = unpacker.Read(3);
+            int reserved1 = unpacker.Read(10);
+
+            int surfaceWidthMinus1  = unpacker.Read(14);
+            int surfaceHeightMinus1 = unpacker.Read(14);
+
+            int gobBlockHeight = 1 << blockLinearHeightLog2;
+
+            int surfaceWidth  = surfaceWidthMinus1  + 1;
+            int surfaceHeight = surfaceHeightMinus1 + 1;
+
+            SurfaceOutputConfig outputConfig = new SurfaceOutputConfig(
+                pixelFormat,
+                surfaceWidth,
+                surfaceHeight,
+                gobBlockHeight,
+                _outputSurfaceLumaAddress,
+                _outputSurfaceChromaUAddress,
+                _outputSurfaceChromaVAddress);
+
+            _vdec.CopyPlanes(gpu, outputConfig);
+        }
+
+        private void SetConfigStructOffset(int[] arguments)
+        {
+            _configStructAddress = GetAddress(arguments);
+        }
+
+        private void SetOutputSurfaceLumaOffset(int[] arguments)
+        {
+            _outputSurfaceLumaAddress = GetAddress(arguments);
+        }
+
+        private void SetOutputSurfaceChromaUOffset(int[] arguments)
+        {
+            _outputSurfaceChromaUAddress = GetAddress(arguments);
+        }
+
+        private void SetOutputSurfaceChromaVOffset(int[] arguments)
+        {
+            _outputSurfaceChromaVAddress = GetAddress(arguments);
+        }
+
+        private static ulong GetAddress(int[] arguments)
+        {
+            return (ulong)(uint)arguments[0] << 8;
+        }
+    }
+}

Ryujinx.Graphics.Nvdec/Vic/VideoImageComposerMeth.cs

@@ -0,0 +1,12 @@
+namespace Ryujinx.Graphics.Vic
+{
+    enum VideoImageComposerMeth
+    {
+        Execute                       = 0xc0,
+        SetControlParams              = 0x1c1,
+        SetConfigStructOffset         = 0x1c2,
+        SetOutputSurfaceLumaOffset    = 0x1c8,
+        SetOutputSurfaceChromaUOffset = 0x1c9,
+        SetOutputSurfaceChromaVOffset = 0x1ca
+    }
+}

Ryujinx.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
+# Visual Studio Version 16
-VisualStudioVersion = 15.0.26730.8
+VisualStudioVersion = 16.0.29613.14
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx", "Ryujinx\Ryujinx.csproj", "{074045D4-3ED2-4711-9169-E385F2BFB5A0}"
 EndProject
@@ -26,15 +26,17 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx.Profiler", "Ryujinx
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ARMeilleure", "ARMeilleure\ARMeilleure.csproj", "{ABF09A5E-2D8B-4B6F-A51D-5CE414DDB15A}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ryujinx.Graphics.Gpu", "Ryujinx.Graphics.Gpu\Ryujinx.Graphics.Gpu.csproj", "{ADA7EA87-0D63-4D97-9433-922A2124401F}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx.Graphics.Gpu", "Ryujinx.Graphics.Gpu\Ryujinx.Graphics.Gpu.csproj", "{ADA7EA87-0D63-4D97-9433-922A2124401F}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ryujinx.Graphics.GAL", "Ryujinx.Graphics.GAL\Ryujinx.Graphics.GAL.csproj", "{A602AE97-91A5-4608-8DF1-EBF4ED7A0B9E}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx.Graphics.GAL", "Ryujinx.Graphics.GAL\Ryujinx.Graphics.GAL.csproj", "{A602AE97-91A5-4608-8DF1-EBF4ED7A0B9E}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ryujinx.Graphics.OpenGL", "Ryujinx.Graphics.OpenGL\Ryujinx.Graphics.OpenGL.csproj", "{9558FB96-075D-4219-8FFF-401979DC0B69}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx.Graphics.OpenGL", "Ryujinx.Graphics.OpenGL\Ryujinx.Graphics.OpenGL.csproj", "{9558FB96-075D-4219-8FFF-401979DC0B69}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ryujinx.Graphics.Texture", "Ryujinx.Graphics.Texture\Ryujinx.Graphics.Texture.csproj", "{E1B1AD28-289D-47B7-A106-326972240207}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx.Graphics.Texture", "Ryujinx.Graphics.Texture\Ryujinx.Graphics.Texture.csproj", "{E1B1AD28-289D-47B7-A106-326972240207}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ryujinx.Graphics.Shader", "Ryujinx.Graphics.Shader\Ryujinx.Graphics.Shader.csproj", "{03B955CD-AD84-4B93-AAA7-BF17923BBAA5}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ryujinx.Graphics.Shader", "Ryujinx.Graphics.Shader\Ryujinx.Graphics.Shader.csproj", "{03B955CD-AD84-4B93-AAA7-BF17923BBAA5}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ryujinx.Graphics.Nvdec", "Ryujinx.Graphics.Nvdec\Ryujinx.Graphics.Nvdec.csproj", "{85A0FA56-DC01-4A42-8808-70DAC76BD66D}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -76,14 +78,6 @@ Global
 		{CB92CFF9-1D62-4D4F-9E88-8130EF61E351}.Profile Release|Any CPU.Build.0 = Profile Release|Any CPU
 		{CB92CFF9-1D62-4D4F-9E88-8130EF61E351}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{CB92CFF9-1D62-4D4F-9E88-8130EF61E351}.Release|Any CPU.Build.0 = Release|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Profile Debug|Any CPU.ActiveCfg = Profile Debug|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Profile Debug|Any CPU.Build.0 = Profile Debug|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Profile Release|Any CPU.ActiveCfg = Profile Release|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Profile Release|Any CPU.Build.0 = Profile Release|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{2345A1A7-8DEF-419B-9AFB-4DFD41D20D05}.Release|Any CPU.Build.0 = Release|Any CPU
 		{5C1D818E-682A-46A5-9D54-30006E26C270}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{5C1D818E-682A-46A5-9D54-30006E26C270}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5C1D818E-682A-46A5-9D54-30006E26C270}.Profile Debug|Any CPU.ActiveCfg = Profile Debug|Any CPU
@@ -172,6 +166,14 @@ Global
 		{03B955CD-AD84-4B93-AAA7-BF17923BBAA5}.Profile Release|Any CPU.Build.0 = Debug|Any CPU
 		{03B955CD-AD84-4B93-AAA7-BF17923BBAA5}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{03B955CD-AD84-4B93-AAA7-BF17923BBAA5}.Release|Any CPU.Build.0 = Release|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Profile Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Profile Debug|Any CPU.Build.0 = Debug|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Profile Release|Any CPU.ActiveCfg = Release|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Profile Release|Any CPU.Build.0 = Release|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{85A0FA56-DC01-4A42-8808-70DAC76BD66D}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE