/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * H.264 Bitmap Compression
 *
 * Copyright 2014 Mike McDonald <Mike.McDonald@software.dell.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <winpr/crt.h>
#include <winpr/print.h>
#include <winpr/library.h>
#include <winpr/bitstream.h>

#include <freerdp/primitives.h>
#include <freerdp/codec/h264.h>
#include <freerdp/log.h>

#define TAG FREERDP_TAG("codec")

/**
 * Dummy subsystem
 */

static int dummy_decompress(H264_CONTEXT* h264, const BYTE* pSrcData, UINT32 SrcSize)
{
	return -1;
}

static int dummy_compress(H264_CONTEXT* h264, BYTE** ppDstData, UINT32* pDstSize)
{
	//H264_CONTEXT_X264* sys = (H264_CONTEXT_X264*) h264->pSystemData;
	return -1;
}

static void dummy_uninit(H264_CONTEXT* h264)
{
}

static BOOL dummy_init(H264_CONTEXT* h264)
{
	return TRUE;
}

static H264_CONTEXT_SUBSYSTEM g_Subsystem_dummy =
{
	"dummy",
	dummy_init,
	dummy_uninit,
	dummy_decompress,
	dummy_compress
};

/**
 * Media Foundation subsystem
 */

#if defined(_WIN32) && defined(WITH_MEDIA_FOUNDATION)

#include <ks.h>
#include <codecapi.h>

#include <mfapi.h>
#include <mferror.h>
#include <wmcodecdsp.h>
#include <mftransform.h>

#undef DEFINE_GUID
#define INITGUID
#include <initguid.h>

DEFINE_GUID(CLSID_CMSH264DecoderMFT, 0x62CE7E72, 0x4C71, 0x4d20, 0xB1, 0x5D,
            0x45, 0x28, 0x31, 0xA8, 0x7D, 0x9D);
DEFINE_GUID(CLSID_VideoProcessorMFT, 0x88753b26, 0x5b24, 0x49bd, 0xb2, 0xe7,
            0x0c, 0x44, 0x5c, 0x78, 0xc9, 0x82);
DEFINE_GUID(IID_IMFTransform, 0xbf94c121, 0x5b05, 0x4e6f, 0x80, 0x00, 0xba,
            0x59, 0x89, 0x61, 0x41, 0x4d);
DEFINE_GUID(MF_MT_MAJOR_TYPE, 0x48eba18e, 0xf8c9, 0x4687, 0xbf, 0x11, 0x0a,
            0x74, 0xc9, 0xf9, 0x6a, 0x8f);
DEFINE_GUID(MF_MT_FRAME_SIZE, 0x1652c33d, 0xd6b2, 0x4012, 0xb8, 0x34, 0x72,
            0x03, 0x08, 0x49, 0xa3, 0x7d);
DEFINE_GUID(MF_MT_DEFAULT_STRIDE, 0x644b4e48, 0x1e02, 0x4516, 0xb0, 0xeb, 0xc0,
            0x1c, 0xa9, 0xd4, 0x9a, 0xc6);
DEFINE_GUID(MF_MT_SUBTYPE, 0xf7e34c9a, 0x42e8, 0x4714, 0xb7, 0x4b, 0xcb, 0x29,
            0xd7, 0x2c, 0x35, 0xe5);
DEFINE_GUID(MF_XVP_DISABLE_FRC, 0x2c0afa19, 0x7a97, 0x4d5a, 0x9e, 0xe8, 0x16,
            0xd4, 0xfc, 0x51, 0x8d, 0x8c);
DEFINE_GUID(MFMediaType_Video, 0x73646976, 0x0000, 0x0010, 0x80, 0x00, 0x00,
            0xAA, 0x00, 0x38, 0x9B, 0x71);
DEFINE_GUID(MFVideoFormat_RGB32, 22, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xAA,
            0x00, 0x38, 0x9B, 0x71);
DEFINE_GUID(MFVideoFormat_ARGB32, 21, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xAA,
            0x00, 0x38, 0x9B, 0x71);
DEFINE_GUID(MFVideoFormat_H264, 0x34363248, 0x0000, 0x0010, 0x80, 0x00, 0x00,
            0xaa, 0x00, 0x38, 0x9b, 0x71);
DEFINE_GUID(MFVideoFormat_IYUV, 0x56555949, 0x0000, 0x0010, 0x80, 0x00, 0x00,
            0xaa, 0x00, 0x38, 0x9b, 0x71);
DEFINE_GUID(IID_ICodecAPI, 0x901db4c7, 0x31ce, 0x41a2, 0x85, 0xdc, 0x8f, 0xa0,
            0xbf, 0x41, 0xb8, 0xda);
DEFINE_GUID(CODECAPI_AVLowLatencyMode, 0x9c27891a, 0xed7a, 0x40e1, 0x88, 0xe8,
            0xb2, 0x27, 0x27, 0xa0, 0x24, 0xee);
DEFINE_GUID(CODECAPI_AVDecVideoMaxCodedWidth, 0x5ae557b8, 0x77af, 0x41f5, 0x9f,
            0xa6, 0x4d, 0xb2, 0xfe, 0x1d, 0x4b, 0xca);
DEFINE_GUID(CODECAPI_AVDecVideoMaxCodedHeight, 0x7262a16a, 0xd2dc, 0x4e75, 0x9b,
            0xa8, 0x65, 0xc0, 0xc6, 0xd3, 0x2b, 0x13);

#ifndef __IMFDXGIDeviceManager_FWD_DEFINED__
#define __IMFDXGIDeviceManager_FWD_DEFINED__
typedef interface IMFDXGIDeviceManager IMFDXGIDeviceManager;
#endif /* __IMFDXGIDeviceManager_FWD_DEFINED__ */

#ifndef __IMFDXGIDeviceManager_INTERFACE_DEFINED__
#define __IMFDXGIDeviceManager_INTERFACE_DEFINED__

typedef struct IMFDXGIDeviceManagerVtbl
{
	HRESULT(STDMETHODCALLTYPE* QueryInterface)(IMFDXGIDeviceManager* This,
	        REFIID riid, void** ppvObject);
	ULONG(STDMETHODCALLTYPE* AddRef)(IMFDXGIDeviceManager* This);
	ULONG(STDMETHODCALLTYPE* Release)(IMFDXGIDeviceManager* This);
	HRESULT(STDMETHODCALLTYPE* CloseDeviceHandle)(IMFDXGIDeviceManager* This,
	        HANDLE hDevice);
	HRESULT(STDMETHODCALLTYPE* GetVideoService)(IMFDXGIDeviceManager* This,
	        HANDLE hDevice, REFIID riid, void** ppService);
	HRESULT(STDMETHODCALLTYPE* LockDevice)(IMFDXGIDeviceManager* This,
	                                       HANDLE hDevice, REFIID riid, void** ppUnkDevice, BOOL fBlock);
	HRESULT(STDMETHODCALLTYPE* OpenDeviceHandle)(IMFDXGIDeviceManager* This,
	        HANDLE* phDevice);
	HRESULT(STDMETHODCALLTYPE* ResetDevice)(IMFDXGIDeviceManager* This,
	                                        IUnknown* pUnkDevice, UINT resetToken);
	HRESULT(STDMETHODCALLTYPE* TestDevice)(IMFDXGIDeviceManager* This,
	                                       HANDLE hDevice);
	HRESULT(STDMETHODCALLTYPE* UnlockDevice)(IMFDXGIDeviceManager* This,
	        HANDLE hDevice, BOOL fSaveState);
}
IMFDXGIDeviceManagerVtbl;

interface IMFDXGIDeviceManager
{
	CONST_VTBL struct IMFDXGIDeviceManagerVtbl* lpVtbl;
};

#endif /* __IMFDXGIDeviceManager_INTERFACE_DEFINED__ */

typedef HRESULT(__stdcall* pfnMFStartup)(ULONG Version, DWORD dwFlags);
typedef HRESULT(__stdcall* pfnMFShutdown)(void);
typedef HRESULT(__stdcall* pfnMFCreateSample)(IMFSample** ppIMFSample);
typedef HRESULT(__stdcall* pfnMFCreateMemoryBuffer)(DWORD cbMaxLength,
        IMFMediaBuffer** ppBuffer);
typedef HRESULT(__stdcall* pfnMFCreateMediaType)(IMFMediaType** ppMFType);
typedef HRESULT(__stdcall* pfnMFCreateDXGIDeviceManager)(UINT* pResetToken,
        IMFDXGIDeviceManager** ppDXVAManager);

struct _H264_CONTEXT_MF
{
	ICodecAPI* codecApi;
	IMFTransform* transform;
	IMFMediaType* inputType;
	IMFMediaType* outputType;
	IMFSample* sample;
	UINT32 frameWidth;
	UINT32 frameHeight;
	IMFSample* outputSample;
	IMFMediaBuffer* outputBuffer;
	HMODULE mfplat;
	pfnMFStartup MFStartup;
	pfnMFShutdown MFShutdown;
	pfnMFCreateSample MFCreateSample;
	pfnMFCreateMemoryBuffer MFCreateMemoryBuffer;
	pfnMFCreateMediaType MFCreateMediaType;
	pfnMFCreateDXGIDeviceManager MFCreateDXGIDeviceManager;
};
typedef struct _H264_CONTEXT_MF H264_CONTEXT_MF;

static HRESULT mf_find_output_type(H264_CONTEXT_MF* sys, const GUID* guid,
                                   IMFMediaType** ppMediaType)
{
	DWORD idx = 0;
	GUID mediaGuid;
	HRESULT hr = S_OK;
	IMFMediaType* pMediaType = NULL;

	while (1)
	{
		hr = sys->transform->lpVtbl->GetOutputAvailableType(sys->transform, 0, idx,
		        &pMediaType);

		if (FAILED(hr))
			break;

		pMediaType->lpVtbl->GetGUID(pMediaType, &MF_MT_SUBTYPE, &mediaGuid);

		if (IsEqualGUID(&mediaGuid, guid))
		{
			*ppMediaType = pMediaType;
			return S_OK;
		}

		pMediaType->lpVtbl->Release(pMediaType);
		idx++;
	}

	return hr;
}

static HRESULT mf_create_output_sample(H264_CONTEXT_MF* sys)
{
	HRESULT hr = S_OK;
	MFT_OUTPUT_STREAM_INFO streamInfo;

	if (sys->outputSample)
	{
		sys->outputSample->lpVtbl->Release(sys->outputSample);
		sys->outputSample = NULL;
	}

	hr = sys->MFCreateSample(&sys->outputSample);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "MFCreateSample failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	hr = sys->transform->lpVtbl->GetOutputStreamInfo(sys->transform, 0,
	        &streamInfo);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "GetOutputStreamInfo failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	hr = sys->MFCreateMemoryBuffer(streamInfo.cbSize, &sys->outputBuffer);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "MFCreateMemoryBuffer failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	sys->outputSample->lpVtbl->AddBuffer(sys->outputSample, sys->outputBuffer);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "AddBuffer failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	sys->outputBuffer->lpVtbl->Release(sys->outputBuffer);
error:
	return hr;
}

static int mf_decompress(H264_CONTEXT* h264, BYTE* pSrcData, UINT32 SrcSize)
{
	HRESULT hr;
	BYTE* pbBuffer = NULL;
	DWORD cbMaxLength = 0;
	DWORD cbCurrentLength = 0;
	DWORD outputStatus = 0;
	IMFSample* inputSample = NULL;
	IMFMediaBuffer* inputBuffer = NULL;
	IMFMediaBuffer* outputBuffer = NULL;
	MFT_OUTPUT_DATA_BUFFER outputDataBuffer;
	H264_CONTEXT_MF* sys = (H264_CONTEXT_MF*) h264->pSystemData;
	INT32* iStride = h264->iStride;
	BYTE** pYUVData = h264->pYUVData;
	hr = sys->MFCreateMemoryBuffer(SrcSize, &inputBuffer);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "MFCreateMemoryBuffer failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	hr = inputBuffer->lpVtbl->Lock(inputBuffer, &pbBuffer, &cbMaxLength,
	                               &cbCurrentLength);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "Lock failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	CopyMemory(pbBuffer, pSrcData, SrcSize);
	hr = inputBuffer->lpVtbl->SetCurrentLength(inputBuffer, SrcSize);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "SetCurrentLength failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	hr = inputBuffer->lpVtbl->Unlock(inputBuffer);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "Unlock failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	hr = sys->MFCreateSample(&inputSample);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "MFCreateSample failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	inputSample->lpVtbl->AddBuffer(inputSample, inputBuffer);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "AddBuffer failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	inputBuffer->lpVtbl->Release(inputBuffer);
	hr = sys->transform->lpVtbl->ProcessInput(sys->transform, 0, inputSample, 0);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "ProcessInput failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	hr = mf_create_output_sample(sys);

	if (FAILED(hr))
	{
		WLog_ERR(TAG, "mf_create_output_sample failure: 0x%08"PRIX32"", hr);
		goto error;
	}

	outputDataBuffer.dwStreamID = 0;
	outputDataBuffer.dwStatus = 0;
	outputDataBuffer.pEvents = NULL;
	outputDataBuffer.pSample = sys->outputSample;
	hr = sys->transform->lpVtbl->ProcessOutput(sys->transform, 0, 1,
	        &outputDataBuffer, &outputStatus);

	if (hr == MF_E_TRANSFORM_STREAM_CHANGE)
	{
		BYTE* pTmpYUVData;
		int offset = 0;
		UINT32 stride = 0;
		UINT64 frameSize = 0;
		IMFAttributes* attributes = NULL;

		if (sys->outputType)
		{
			sys->outputType->lpVtbl->Release(sys->outputType);
			sys->outputType = NULL;
		}

		hr = mf_find_output_type(sys, &MFVideoFormat_IYUV, &sys->outputType);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "mf_find_output_type failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->transform->lpVtbl->SetOutputType(sys->transform, 0, sys->outputType,
		        0);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "SetOutputType failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = mf_create_output_sample(sys);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "mf_create_output_sample failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->outputType->lpVtbl->GetUINT64(sys->outputType, &MF_MT_FRAME_SIZE,
		                                        &frameSize);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "GetUINT64(MF_MT_FRAME_SIZE) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		sys->frameWidth = (UINT32)(frameSize >> 32);
		sys->frameHeight = (UINT32) frameSize;
		hr = sys->outputType->lpVtbl->GetUINT32(sys->outputType, &MF_MT_DEFAULT_STRIDE,
		                                        &stride);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "GetUINT32(MF_MT_DEFAULT_STRIDE) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		iStride[0] = stride;
		iStride[1] = stride / 2;
		iStride[2] = stride / 2;
		pTmpYUVData = (BYTE*) calloc(1, 2 * stride * sys->frameHeight);
		pYUVData[0] = &pTmpYUVData[offset];
		pTmpYUVData += iStride[0] * sys->frameHeight;
		pYUVData[1] = &pTmpYUVData[offset];
		pTmpYUVData += iStride[1] * (sys->frameHeight / 2);
		pYUVData[2] = &pTmpYUVData[offset];
		pTmpYUVData += iStride[2] * (sys->frameHeight / 2);
		h264->width = sys->frameWidth;
		h264->height = sys->frameHeight;
	}
	else if (hr == MF_E_TRANSFORM_NEED_MORE_INPUT)
	{
	}
	else if (FAILED(hr))
	{
		WLog_ERR(TAG, "ProcessOutput failure: 0x%08"PRIX32"", hr);
		goto error;
	}
	else
	{
		int offset = 0;
		BYTE* buffer = NULL;
		DWORD bufferCount = 0;
		DWORD cbMaxLength = 0;
		DWORD cbCurrentLength = 0;
		hr = sys->outputSample->lpVtbl->GetBufferCount(sys->outputSample, &bufferCount);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "GetBufferCount failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->outputSample->lpVtbl->GetBufferByIndex(sys->outputSample, 0,
		        &outputBuffer);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "GetBufferByIndex failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = outputBuffer->lpVtbl->Lock(outputBuffer, &buffer, &cbMaxLength,
		                                &cbCurrentLength);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "Lock failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		CopyMemory(pYUVData[0], &buffer[offset], iStride[0] * sys->frameHeight);
		offset += iStride[0] * sys->frameHeight;
		CopyMemory(pYUVData[1], &buffer[offset], iStride[1] * (sys->frameHeight / 2));
		offset += iStride[1] * (sys->frameHeight / 2);
		CopyMemory(pYUVData[2], &buffer[offset], iStride[2] * (sys->frameHeight / 2));
		offset += iStride[2] * (sys->frameHeight / 2);
		hr = outputBuffer->lpVtbl->Unlock(outputBuffer);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "Unlock failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		outputBuffer->lpVtbl->Release(outputBuffer);
	}

	inputSample->lpVtbl->Release(inputSample);
	return 1;
error:
	fprintf(stderr, "mf_decompress error\n");
	return -1;
}

static int mf_compress(H264_CONTEXT* h264, BYTE** ppDstData, UINT32* pDstSize)
{
	H264_CONTEXT_MF* sys = (H264_CONTEXT_MF*) h264->pSystemData;
	return 1;
}

static void mf_uninit(H264_CONTEXT* h264)
{
	UINT32 x;
	H264_CONTEXT_MF* sys = (H264_CONTEXT_MF*) h264->pSystemData;

	if (sys)
	{
		if (sys->transform)
		{
			sys->transform->lpVtbl->Release(sys->transform);
			sys->transform = NULL;
		}

		if (sys->codecApi)
		{
			sys->codecApi->lpVtbl->Release(sys->codecApi);
			sys->codecApi = NULL;
		}

		if (sys->inputType)
		{
			sys->inputType->lpVtbl->Release(sys->inputType);
			sys->inputType = NULL;
		}

		if (sys->outputType)
		{
			sys->outputType->lpVtbl->Release(sys->outputType);
			sys->outputType = NULL;
		}

		if (sys->outputSample)
		{
			sys->outputSample->lpVtbl->Release(sys->outputSample);
			sys->outputSample = NULL;
		}

		if (sys->mfplat)
		{
			FreeLibrary(sys->mfplat);
			sys->mfplat = NULL;
		}

		for (x = 0; x < sizeof(h264->pYUVData) / sizeof(h264->pYUVData[0]); x++)
			free(h264->pYUVData[x]);

		memset(h264->pYUVData, 0, sizeof(h264->pYUVData));
		memset(h264->iStride, 0, sizeof(h264->iStride));
		sys->MFShutdown();
		CoUninitialize();
		free(sys);
		h264->pSystemData = NULL;
	}
}

static BOOL mf_init(H264_CONTEXT* h264)
{
	HRESULT hr;
	H264_CONTEXT_MF* sys;
	sys = (H264_CONTEXT_MF*) calloc(1, sizeof(H264_CONTEXT_MF));

	if (!sys)
		goto error;

	h264->pSystemData = (void*) sys;
	/* http://decklink-sdk-delphi.googlecode.com/svn/trunk/Blackmagic%20DeckLink%20SDK%209.7/Win/Samples/Streaming/StreamingPreview/DecoderMF.cpp */
	sys->mfplat = LoadLibraryA("mfplat.dll");

	if (!sys->mfplat)
		goto error;

	sys->MFStartup = (pfnMFStartup) GetProcAddress(sys->mfplat, "MFStartup");
	sys->MFShutdown = (pfnMFShutdown) GetProcAddress(sys->mfplat, "MFShutdown");
	sys->MFCreateSample = (pfnMFCreateSample) GetProcAddress(sys->mfplat,
	                      "MFCreateSample");
	sys->MFCreateMemoryBuffer = (pfnMFCreateMemoryBuffer) GetProcAddress(
	                                sys->mfplat, "MFCreateMemoryBuffer");
	sys->MFCreateMediaType = (pfnMFCreateMediaType) GetProcAddress(sys->mfplat,
	                         "MFCreateMediaType");
	sys->MFCreateDXGIDeviceManager = (pfnMFCreateDXGIDeviceManager) GetProcAddress(
	                                     sys->mfplat, "MFCreateDXGIDeviceManager");

	if (!sys->MFStartup || !sys->MFShutdown || !sys->MFCreateSample
	    || !sys->MFCreateMemoryBuffer ||
	    !sys->MFCreateMediaType || !sys->MFCreateDXGIDeviceManager)
		goto error;

	CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

	if (h264->Compressor)
	{
	}
	else
	{
		VARIANT var = { 0 };
		hr = sys->MFStartup(MF_VERSION, 0);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "MFStartup failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = CoCreateInstance(&CLSID_CMSH264DecoderMFT, NULL, CLSCTX_INPROC_SERVER,
		                      &IID_IMFTransform, (void**) &sys->transform);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "CoCreateInstance(CLSID_CMSH264DecoderMFT) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->transform->lpVtbl->QueryInterface(sys->transform, &IID_ICodecAPI,
		        (void**) &sys->codecApi);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "QueryInterface(IID_ICodecAPI) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		var.vt = VT_UI4;
		var.ulVal = 1;
		hr = sys->codecApi->lpVtbl->SetValue(sys->codecApi, &CODECAPI_AVLowLatencyMode,
		                                     &var);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "SetValue(CODECAPI_AVLowLatencyMode) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->MFCreateMediaType(&sys->inputType);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "MFCreateMediaType failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->inputType->lpVtbl->SetGUID(sys->inputType, &MF_MT_MAJOR_TYPE,
		                                     &MFMediaType_Video);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "SetGUID(MF_MT_MAJOR_TYPE) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->inputType->lpVtbl->SetGUID(sys->inputType, &MF_MT_SUBTYPE,
		                                     &MFVideoFormat_H264);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "SetGUID(MF_MT_SUBTYPE) failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->transform->lpVtbl->SetInputType(sys->transform, 0, sys->inputType, 0);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "SetInputType failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = mf_find_output_type(sys, &MFVideoFormat_IYUV, &sys->outputType);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "mf_find_output_type failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = sys->transform->lpVtbl->SetOutputType(sys->transform, 0, sys->outputType,
		        0);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "SetOutputType failure: 0x%08"PRIX32"", hr);
			goto error;
		}

		hr = mf_create_output_sample(sys);

		if (FAILED(hr))
		{
			WLog_ERR(TAG, "mf_create_output_sample failure: 0x%08"PRIX32"", hr);
			goto error;
		}
	}

	return TRUE;
error:
	WLog_ERR(TAG, "mf_init failure");
	mf_uninit(h264);
	return FALSE;
}

static H264_CONTEXT_SUBSYSTEM g_Subsystem_MF =
{
	"MediaFoundation",
	mf_init,
	mf_uninit,
	mf_decompress,
	mf_compress
};

#endif

/**
 * x264 subsystem
 */

#ifdef WITH_X264

#define NAL_UNKNOWN	X264_NAL_UNKNOWN
#define NAL_SLICE	X264_NAL_SLICE
#define NAL_SLICE_DPA	X264_NAL_SLICE_DPA
#define NAL_SLICE_DPB	X264_NAL_SLICE_DPB
#define NAL_SLICE_DPC	X264_NAL_SLICE_DPC
#define NAL_SLICE_IDR	X264_NAL_SLICE_IDR
#define NAL_SEI		X264_NAL_SEI
#define NAL_SPS		X264_NAL_SPS
#define NAL_PPS		X264_NAL_PPS
#define NAL_AUD		X264_NAL_AUD
#define NAL_FILLER	X264_NAL_FILLER

#define NAL_PRIORITY_DISPOSABLE	X264_NAL_PRIORITY_DISPOSABLE
#define NAL_PRIORITY_LOW	X264_NAL_PRIORITY_LOW
#define NAL_PRIORITY_HIGH	X264_NAL_PRIORITY_HIGH
#define NAL_PRIORITY_HIGHEST	X264_NAL_PRIORITY_HIGHEST

#include <stdint.h>
#include <x264.h>

struct _H264_CONTEXT_X264
{
	void* dummy;
};
typedef struct _H264_CONTEXT_X264 H264_CONTEXT_X264;

static int x264_decompress(H264_CONTEXT* h264, BYTE* pSrcData, UINT32 SrcSize)
{
	//H264_CONTEXT_X264* sys = (H264_CONTEXT_X264*) h264->pSystemData;
	return -1;
}

static int x264_compress(H264_CONTEXT* h264, BYTE** ppDstData, UINT32* pDstSize)
{
	//H264_CONTEXT_X264* sys = (H264_CONTEXT_X264*) h264->pSystemData;
	return -1;
}

static void x264_uninit(H264_CONTEXT* h264)
{
	H264_CONTEXT_X264* sys = (H264_CONTEXT_X264*) h264->pSystemData;

	if (sys)
	{
		free(sys);
		h264->pSystemData = NULL;
	}
}

static BOOL x264_init(H264_CONTEXT* h264)
{
	H264_CONTEXT_X264* sys;
	h264->numSystemData = 1;
	sys = (H264_CONTEXT_X264*) calloc(h264->numSystemData,
	                                  sizeof(H264_CONTEXT_X264));

	if (!sys)
	{
		goto EXCEPTION;
	}

	h264->pSystemData = (void*) sys;

	if (h264->Compressor)
	{
	}
	else
	{
	}

	return TRUE;
EXCEPTION:
	x264_uninit(h264);
	return FALSE;
}

static H264_CONTEXT_SUBSYSTEM g_Subsystem_x264 =
{
	"x264",
	x264_init,
	x264_uninit,
	x264_decompress,
	x264_compress
};

#undef NAL_UNKNOWN
#undef NAL_SLICE
#undef NAL_SLICE_DPA
#undef NAL_SLICE_DPB
#undef NAL_SLICE_DPC
#undef NAL_SLICE_IDR
#undef NAL_SEI
#undef NAL_SPS
#undef NAL_PPS
#undef NAL_AUD
#undef NAL_FILLER

#undef NAL_PRIORITY_DISPOSABLE
#undef NAL_PRIORITY_LOW
#undef NAL_PRIORITY_HIGH
#undef NAL_PRIORITY_HIGHEST

#endif

/**
 * OpenH264 subsystem
 */

#ifdef WITH_OPENH264

#include "wels/codec_def.h"
#include "wels/codec_api.h"
#include "wels/codec_ver.h"

#if (OPENH264_MAJOR == 1) && (OPENH264_MINOR < 3) || (OPENH264_MAJOR < 1)
#error "Unsupported OpenH264 version "OPENH264_MAJOR"."OPENH264_MINOR"."OPENH264_REVISION" detected!"
#elif (OPENH264_MAJOR > 1) || (OPENH264_MINOR > 6)
#warning "Untested OpenH264 version "OPENH264_MAJOR"."OPENH264_MINOR"."OPENH264_REVISION" detected!"
#endif

struct _H264_CONTEXT_OPENH264
{
	ISVCDecoder* pDecoder;
	ISVCEncoder* pEncoder;
	SEncParamExt EncParamExt;
};
typedef struct _H264_CONTEXT_OPENH264 H264_CONTEXT_OPENH264;

static BOOL g_openh264_trace_enabled = FALSE;

static void openh264_trace_callback(H264_CONTEXT* h264, int level,
                                    const char* message)
{
	WLog_INFO(TAG, "%d - %s", level, message);
}

static int openh264_decompress(H264_CONTEXT* h264, const BYTE* pSrcData,
                               UINT32 SrcSize)
{
	DECODING_STATE state;
	SBufferInfo sBufferInfo;
	SSysMEMBuffer* pSystemBuffer;
	H264_CONTEXT_OPENH264* sys = (H264_CONTEXT_OPENH264*) h264->pSystemData;
	UINT32* iStride = h264->iStride;
	BYTE** pYUVData = h264->pYUVData;

	if (!sys->pDecoder)
		return -2001;

	/*
	 * Decompress the image.  The RDP host only seems to send I420 format.
	 */
	pYUVData[0] = NULL;
	pYUVData[1] = NULL;
	pYUVData[2] = NULL;
	ZeroMemory(&sBufferInfo, sizeof(sBufferInfo));
	state = (*sys->pDecoder)->DecodeFrame2(sys->pDecoder, pSrcData, SrcSize,
	                                       pYUVData, &sBufferInfo);

	if (sBufferInfo.iBufferStatus != 1)
	{
		if (state == dsNoParamSets)
		{
			/* this happens on the first frame due to missing parameter sets */
			state = (*sys->pDecoder)->DecodeFrame2(sys->pDecoder, NULL, 0, pYUVData,
			                                       &sBufferInfo);
		}
		else if (state == dsErrorFree)
		{
			/* call DecodeFrame2 again to decode without delay */
			state = (*sys->pDecoder)->DecodeFrame2(sys->pDecoder, NULL, 0, pYUVData,
			                                       &sBufferInfo);
		}
		else
		{
			WLog_WARN(TAG, "DecodeFrame2 state: 0x%04X iBufferStatus: %d", state,
			          sBufferInfo.iBufferStatus);
			return -2002;
		}
	}

	pSystemBuffer = &sBufferInfo.UsrData.sSystemBuffer;
	iStride[0] = pSystemBuffer->iStride[0];
	iStride[1] = pSystemBuffer->iStride[1];
	iStride[2] = pSystemBuffer->iStride[1];

	if (sBufferInfo.iBufferStatus != 1)
	{
		WLog_WARN(TAG, "DecodeFrame2 iBufferStatus: %d", sBufferInfo.iBufferStatus);
		return 0;
	}

	if (state != dsErrorFree)
	{
		WLog_WARN(TAG, "DecodeFrame2 state: 0x%02X", state);
		return -2003;
	}

#if 0
	WLog_INFO(TAG,
	          "h264_decompress: state=%u, pYUVData=[%p,%p,%p], bufferStatus=%d, width=%d, height=%d, format=%d, stride=[%d,%d]",
	          state, (void*) pYUVData[0], (void*) pYUVData[1], (void*) pYUVData[2], sBufferInfo.iBufferStatus,
	          pSystemBuffer->iWidth, pSystemBuffer->iHeight, pSystemBuffer->iFormat,
	          pSystemBuffer->iStride[0], pSystemBuffer->iStride[1]);
#endif

	if (pSystemBuffer->iFormat != videoFormatI420)
		return -2004;

	if (!pYUVData[0] || !pYUVData[1] || !pYUVData[2])
		return -2005;

	return 1;
}

static int openh264_compress(H264_CONTEXT* h264, BYTE** ppDstData,
                             UINT32* pDstSize)
{
	int i, j;
	int status;
	SFrameBSInfo info;
	SSourcePicture pic;
	SBitrateInfo bitrate;
	H264_CONTEXT_OPENH264* sys;
	BYTE** pYUVData = h264->pYUVData;
	UINT32* iStride = h264->iStride;
	sys = &((H264_CONTEXT_OPENH264*) h264->pSystemData)[0];

	if (!sys->pEncoder)
		return -1;

	if (!pYUVData[0] || !pYUVData[1] || !pYUVData[2])
		return -1;

	if ((sys->EncParamExt.iPicWidth != h264->width)
	    || (sys->EncParamExt.iPicHeight != h264->height))
	{
		status = (*sys->pEncoder)->GetDefaultParams(sys->pEncoder, &sys->EncParamExt);

		if (status < 0)
		{
			WLog_ERR(TAG, "Failed to get OpenH264 default parameters (status=%d)", status);
			return status;
		}

		sys->EncParamExt.iUsageType = SCREEN_CONTENT_REAL_TIME;
		sys->EncParamExt.iPicWidth = h264->width;
		sys->EncParamExt.iPicHeight = h264->height;
		sys->EncParamExt.fMaxFrameRate = h264->FrameRate;
		sys->EncParamExt.iMaxBitrate = UNSPECIFIED_BIT_RATE;
		sys->EncParamExt.bEnableDenoise = 0;
		sys->EncParamExt.bEnableLongTermReference = 0;
		sys->EncParamExt.bEnableFrameSkip = 0;
		sys->EncParamExt.iSpatialLayerNum = 1;
		sys->EncParamExt.iMultipleThreadIdc = h264->NumberOfThreads;
		sys->EncParamExt.sSpatialLayers[0].fFrameRate = h264->FrameRate;
		sys->EncParamExt.sSpatialLayers[0].iVideoWidth = sys->EncParamExt.iPicWidth;
		sys->EncParamExt.sSpatialLayers[0].iVideoHeight = sys->EncParamExt.iPicHeight;
		sys->EncParamExt.sSpatialLayers[0].iMaxSpatialBitrate =
		    sys->EncParamExt.iMaxBitrate;

		switch (h264->RateControlMode)
		{
			case H264_RATECONTROL_VBR:
				sys->EncParamExt.iRCMode = RC_BITRATE_MODE;
				sys->EncParamExt.iTargetBitrate = h264->BitRate;
				sys->EncParamExt.sSpatialLayers[0].iSpatialBitrate =
				    sys->EncParamExt.iTargetBitrate;
				break;

			case H264_RATECONTROL_CQP:
				sys->EncParamExt.iRCMode = RC_OFF_MODE;
				sys->EncParamExt.sSpatialLayers[0].iDLayerQp = h264->QP;
				break;
		}

		if (sys->EncParamExt.iMultipleThreadIdc > 1)
		{
#if (OPENH264_MAJOR == 1) && (OPENH264_MINOR <= 5)
			sys->EncParamExt.sSpatialLayers[0].sSliceCfg.uiSliceMode = SM_AUTO_SLICE;
#endif
		}

		status = (*sys->pEncoder)->InitializeExt(sys->pEncoder, &sys->EncParamExt);

		if (status < 0)
		{
			WLog_ERR(TAG, "Failed to initialize OpenH264 encoder (status=%d)", status);
			return status;
		}

		status = (*sys->pEncoder)->GetOption(sys->pEncoder,
		                                     ENCODER_OPTION_SVC_ENCODE_PARAM_EXT,
		                                     &sys->EncParamExt);

		if (status < 0)
		{
			WLog_ERR(TAG, "Failed to get initial OpenH264 encoder parameters (status=%d)",
			         status);
			return status;
		}
	}
	else
	{
		switch (h264->RateControlMode)
		{
			case H264_RATECONTROL_VBR:
				if (sys->EncParamExt.iTargetBitrate != h264->BitRate)
				{
					sys->EncParamExt.iTargetBitrate = h264->BitRate;
					bitrate.iLayer = SPATIAL_LAYER_ALL;
					bitrate.iBitrate = h264->BitRate;
					status = (*sys->pEncoder)->SetOption(sys->pEncoder, ENCODER_OPTION_BITRATE,
					                                     &bitrate);

					if (status < 0)
					{
						WLog_ERR(TAG, "Failed to set encoder bitrate (status=%d)", status);
						return status;
					}
				}

				if (sys->EncParamExt.fMaxFrameRate != h264->FrameRate)
				{
					sys->EncParamExt.fMaxFrameRate = h264->FrameRate;
					status = (*sys->pEncoder)->SetOption(sys->pEncoder, ENCODER_OPTION_FRAME_RATE,
					                                     &sys->EncParamExt.fMaxFrameRate);

					if (status < 0)
					{
						WLog_ERR(TAG, "Failed to set encoder framerate (status=%d)", status);
						return status;
					}
				}

				break;

			case H264_RATECONTROL_CQP:
				if (sys->EncParamExt.sSpatialLayers[0].iDLayerQp != h264->QP)
				{
					sys->EncParamExt.sSpatialLayers[0].iDLayerQp = h264->QP;
					status = (*sys->pEncoder)->SetOption(sys->pEncoder,
					                                     ENCODER_OPTION_SVC_ENCODE_PARAM_EXT,
					                                     &sys->EncParamExt);

					if (status < 0)
					{
						WLog_ERR(TAG, "Failed to set encoder parameters (status=%d)", status);
						return status;
					}
				}

				break;
		}
	}

	memset(&info, 0, sizeof(SFrameBSInfo));
	memset(&pic, 0, sizeof(SSourcePicture));
	pic.iPicWidth = h264->width;
	pic.iPicHeight = h264->height;
	pic.iColorFormat = videoFormatI420;
	pic.iStride[0] = iStride[0];
	pic.iStride[1] = iStride[1];
	pic.iStride[2] = iStride[2];
	pic.pData[0] = pYUVData[0];
	pic.pData[1] = pYUVData[1];
	pic.pData[2] = pYUVData[2];
	status = (*sys->pEncoder)->EncodeFrame(sys->pEncoder, &pic, &info);

	if (status < 0)
	{
		WLog_ERR(TAG, "Failed to encode frame (status=%d)", status);
		return status;
	}

	*ppDstData = info.sLayerInfo[0].pBsBuf;
	*pDstSize = 0;

	for (i = 0; i < info.iLayerNum; i++)
	{
		for (j = 0; j < info.sLayerInfo[i].iNalCount; j++)
		{
			*pDstSize += info.sLayerInfo[i].pNalLengthInByte[j];
		}
	}

	return 1;
}

static void openh264_uninit(H264_CONTEXT* h264)
{
	UINT32 x;
	H264_CONTEXT_OPENH264* sysContexts = (H264_CONTEXT_OPENH264*) h264->pSystemData;

	if (sysContexts)
	{
		for (x = 0; x < h264->numSystemData; x++)
		{
			H264_CONTEXT_OPENH264* sys = &sysContexts[x];

			if (sys->pDecoder)
			{
				(*sys->pDecoder)->Uninitialize(sys->pDecoder);
				WelsDestroyDecoder(sys->pDecoder);
				sys->pDecoder = NULL;
			}

			if (sys->pEncoder)
			{
				(*sys->pEncoder)->Uninitialize(sys->pEncoder);
				WelsDestroySVCEncoder(sys->pEncoder);
				sys->pEncoder = NULL;
			}
		}

		free(h264->pSystemData);
		h264->pSystemData = NULL;
	}
}

static BOOL openh264_init(H264_CONTEXT* h264)
{
	UINT32 x;
	long status;
	SDecodingParam sDecParam;
	H264_CONTEXT_OPENH264* sysContexts;
	static int traceLevel = WELS_LOG_DEBUG;
#if (OPENH264_MAJOR == 1) && (OPENH264_MINOR <= 5)
	static EVideoFormatType videoFormat = videoFormatI420;
#endif
	static WelsTraceCallback traceCallback = (WelsTraceCallback)
	        openh264_trace_callback;
	h264->numSystemData = 1;
	sysContexts = (H264_CONTEXT_OPENH264*) calloc(h264->numSystemData,
	              sizeof(H264_CONTEXT_OPENH264));

	if (!sysContexts)
		goto EXCEPTION;

	h264->pSystemData = (void*) sysContexts;

	for (x = 0; x < h264->numSystemData; x++)
	{
		H264_CONTEXT_OPENH264* sys = &sysContexts[x];

		if (h264->Compressor)
		{
			WelsCreateSVCEncoder(&sys->pEncoder);

			if (!sys->pEncoder)
			{
				WLog_ERR(TAG, "Failed to create OpenH264 encoder");
				goto EXCEPTION;
			}
		}
		else
		{
			WelsCreateDecoder(&sys->pDecoder);

			if (!sys->pDecoder)
			{
				WLog_ERR(TAG, "Failed to create OpenH264 decoder");
				goto EXCEPTION;
			}

			ZeroMemory(&sDecParam, sizeof(sDecParam));
#if (OPENH264_MAJOR == 1) && (OPENH264_MINOR <= 5)
			sDecParam.eOutputColorFormat  = videoFormatI420;
#endif
			sDecParam.eEcActiveIdc = ERROR_CON_FRAME_COPY;
			sDecParam.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_AVC;
			status = (*sys->pDecoder)->Initialize(sys->pDecoder, &sDecParam);

			if (status != 0)
			{
				WLog_ERR(TAG, "Failed to initialize OpenH264 decoder (status=%ld)",
				         status);
				goto EXCEPTION;
			}

#if (OPENH264_MAJOR == 1) && (OPENH264_MINOR <= 5)
			status = (*sys->pDecoder)->SetOption(
			             sys->pDecoder, DECODER_OPTION_DATAFORMAT,
			             &videoFormat);
#endif

			if (status != 0)
			{
				WLog_ERR(TAG,
				         "Failed to set data format option on OpenH264 decoder (status=%ld)",
				         status);
				goto EXCEPTION;
			}

			if (g_openh264_trace_enabled)
			{
				status = (*sys->pDecoder)->SetOption(
				             sys->pDecoder, DECODER_OPTION_TRACE_LEVEL,
				             &traceLevel);

				if (status != 0)
				{
					WLog_ERR(TAG,
					         "Failed to set trace level option on OpenH264 decoder (status=%ld)",
					         status);
					goto EXCEPTION;
				}

				status = (*sys->pDecoder)->SetOption(
				             sys->pDecoder, DECODER_OPTION_TRACE_CALLBACK,
				             &traceCallback);

				if (status != 0)
				{
					WLog_ERR(TAG,
					         "Failed to set trace callback option on OpenH264 decoder (status=%ld)",
					         status);
					goto EXCEPTION;
				}

				status = (*sys->pDecoder)->SetOption(
				             sys->pDecoder,
				             DECODER_OPTION_TRACE_CALLBACK_CONTEXT,
				             &h264);

				if (status != 0)
				{
					WLog_ERR(TAG,
					         "Failed to set trace callback context option on OpenH264 decoder (status=%ld)",
					         status);
					goto EXCEPTION;
				}
			}
		}
	}

	return TRUE;
EXCEPTION:
	openh264_uninit(h264);
	return FALSE;
}

static H264_CONTEXT_SUBSYSTEM g_Subsystem_OpenH264 =
{
	"OpenH264",
	openh264_init,
	openh264_uninit,
	openh264_decompress,
	openh264_compress
};

#endif

/**
 * libavcodec subsystem
 */

#ifdef WITH_LIBAVCODEC

#include <libavcodec/avcodec.h>
#include <libavutil/avutil.h>

/* Fallback support for older libavcodec versions */
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(54, 59, 100)
#define AV_CODEC_ID_H264 CODEC_ID_H264
#endif

struct _H264_CONTEXT_LIBAVCODEC
{
	AVCodec* codec;
	AVCodecContext* codecContext;
	AVCodecParserContext* codecParser;
	AVFrame* videoFrame;
};
typedef struct _H264_CONTEXT_LIBAVCODEC H264_CONTEXT_LIBAVCODEC;

static int libavcodec_decompress(H264_CONTEXT* h264, const BYTE* pSrcData,
                                 UINT32 SrcSize)
{
	int status;
	int gotFrame = 0;
	AVPacket packet;
	H264_CONTEXT_LIBAVCODEC* sys = (H264_CONTEXT_LIBAVCODEC*) h264->pSystemData;
	BYTE** pYUVData = h264->pYUVData;
	UINT32* iStride = h264->iStride;
	av_init_packet(&packet);
	packet.data = (BYTE*)pSrcData;
	packet.size = SrcSize;
	/* avcodec_decode_video2 is deprecated with libavcodec 57.48.101 */
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 48, 101)
	status = avcodec_send_packet(sys->codecContext, &packet);

	if (status < 0)
	{
		WLog_ERR(TAG, "Failed to decode video frame (status=%d)", status);
		return -1;
	}

	do
	{
		status = avcodec_receive_frame(sys->codecContext, sys->videoFrame);
	}
	while (status == AVERROR(EAGAIN));

	gotFrame = (status == 0);
#else
	status = avcodec_decode_video2(sys->codecContext, sys->videoFrame, &gotFrame,
	                               &packet);
#endif

	if (status < 0)
	{
		WLog_ERR(TAG, "Failed to decode video frame (status=%d)", status);
		return -1;
	}

#if 0
	WLog_INFO(TAG,
	          "libavcodec_decompress: frame decoded (status=%d, gotFrame=%d, width=%d, height=%d, Y=[%p,%d], U=[%p,%d], V=[%p,%d])",
	          status, gotFrame, sys->videoFrame->width, sys->videoFrame->height,
	          (void*) sys->videoFrame->data[0], sys->videoFrame->linesize[0],
	          (void*) sys->videoFrame->data[1], sys->videoFrame->linesize[1],
	          (void*) sys->videoFrame->data[2], sys->videoFrame->linesize[2]);
#endif

	if (gotFrame)
	{
		pYUVData[0] = sys->videoFrame->data[0];
		pYUVData[1] = sys->videoFrame->data[1];
		pYUVData[2] = sys->videoFrame->data[2];
		iStride[0] = sys->videoFrame->linesize[0];
		iStride[1] = sys->videoFrame->linesize[1];
		iStride[2] = sys->videoFrame->linesize[2];
		h264->width = sys->videoFrame->width;
		h264->height = sys->videoFrame->height;
	}
	else
		return -2;

	return 1;
}

static int libavcodec_compress(H264_CONTEXT* h264, BYTE** ppDstData, UINT32* pDstSize)
{
	return -1;
}

static void libavcodec_uninit(H264_CONTEXT* h264)
{
	H264_CONTEXT_LIBAVCODEC* sys = (H264_CONTEXT_LIBAVCODEC*) h264->pSystemData;

	if (!sys)
		return;

	if (sys->videoFrame)
	{
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 18, 102)
		av_frame_free(&sys->videoFrame);
#else
		av_free(sys->videoFrame);
#endif
	}

	if (sys->codecParser)
	{
		av_parser_close(sys->codecParser);
	}

	if (sys->codecContext)
	{
		avcodec_close(sys->codecContext);
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 69, 100)
		avcodec_free_context(&sys->codecContext);
#else
		av_free(sys->codecContext);
#endif
	}

	free(sys);
	h264->pSystemData = NULL;
}

static BOOL libavcodec_init(H264_CONTEXT* h264)
{
	H264_CONTEXT_LIBAVCODEC* sys;
	sys = (H264_CONTEXT_LIBAVCODEC*) calloc(1, sizeof(H264_CONTEXT_LIBAVCODEC));

	if (!sys)
	{
		goto EXCEPTION;
	}

	h264->pSystemData = (void*) sys;
	avcodec_register_all();
	sys->codec = avcodec_find_decoder(AV_CODEC_ID_H264);

	if (!sys->codec)
	{
		WLog_ERR(TAG, "Failed to find libav H.264 codec");
		goto EXCEPTION;
	}

	sys->codecContext = avcodec_alloc_context3(sys->codec);

	if (!sys->codecContext)
	{
		WLog_ERR(TAG, "Failed to allocate libav codec context");
		goto EXCEPTION;
	}

	if (sys->codec->capabilities & CODEC_CAP_TRUNCATED)
	{
		sys->codecContext->flags |= CODEC_FLAG_TRUNCATED;
	}

	if (avcodec_open2(sys->codecContext, sys->codec, NULL) < 0)
	{
		WLog_ERR(TAG, "Failed to open libav codec");
		goto EXCEPTION;
	}

	sys->codecParser = av_parser_init(AV_CODEC_ID_H264);

	if (!sys->codecParser)
	{
		WLog_ERR(TAG, "Failed to initialize libav parser");
		goto EXCEPTION;
	}

#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 18, 102)
	sys->videoFrame = av_frame_alloc();
#else
	sys->videoFrame = avcodec_alloc_frame();
#endif

	if (!sys->videoFrame)
	{
		WLog_ERR(TAG, "Failed to allocate libav frame");
		goto EXCEPTION;
	}

	return TRUE;
EXCEPTION:
	libavcodec_uninit(h264);
	return FALSE;
}

static H264_CONTEXT_SUBSYSTEM g_Subsystem_libavcodec =
{
	"libavcodec",
	libavcodec_init,
	libavcodec_uninit,
	libavcodec_decompress,
	libavcodec_compress
};

#endif

static BOOL check_rect(const H264_CONTEXT* h264, const RECTANGLE_16* rect,
                       UINT32 nDstWidth, UINT32 nDstHeight)
{
	/* Check, if the output rectangle is valid in decoded h264 frame. */
	if ((rect->right > h264->width) || (rect->left > h264->width))
		return FALSE;

	if ((rect->top > h264->height) || (rect->bottom > h264->height))
		return FALSE;

	/* Check, if the output rectangle is valid in destination buffer. */
	if ((rect->right > nDstWidth) || (rect->left > nDstWidth))
		return FALSE;

	if ((rect->bottom > nDstHeight) || (rect->top > nDstHeight))
		return FALSE;

	return TRUE;
}

static BOOL avc_yuv_to_rgb(H264_CONTEXT* h264, const RECTANGLE_16* regionRects,
                           UINT32 numRegionRects, UINT32 nDstWidth,
                           UINT32 nDstHeight, UINT32 nDstStep, BYTE* pDstData,
                           DWORD DstFormat, BOOL use444)
{
	UINT32 x;
	BYTE* pDstPoint;
	prim_size_t roi;
	int width, height;
	const BYTE* pYUVPoint[3];
	primitives_t* prims = primitives_get();

	for (x = 0; x < numRegionRects; x++)
	{
		const RECTANGLE_16* rect = &(regionRects[x]);
		const UINT32* iStride;
		BYTE** ppYUVData;

		if (use444)
		{
			iStride = h264->iYUV444Stride;
			ppYUVData = h264->pYUV444Data;
		}
		else
		{
			iStride = h264->iStride;
			ppYUVData = h264->pYUVData;
		}

		if (!check_rect(h264, rect, nDstWidth, nDstHeight))
			return FALSE;

		width = rect->right - rect->left;
		height = rect->bottom - rect->top;
		pDstPoint = pDstData + rect->top * nDstStep + rect->left * 4;
		pYUVPoint[0] = ppYUVData[0] + rect->top * iStride[0] + rect->left;
		pYUVPoint[1] = ppYUVData[1];
		pYUVPoint[2] = ppYUVData[2];

		if (use444)
		{
			pYUVPoint[1] += rect->top * iStride[1] + rect->left;
			pYUVPoint[2] += rect->top * iStride[2] + rect->left;
		}
		else
		{
			pYUVPoint[1] += rect->top / 2 * iStride[1] + rect->left / 2;
			pYUVPoint[2] += rect->top / 2 * iStride[2] + rect->left / 2;
		}

		roi.width = width;
		roi.height = height;

		if (use444)
		{
			if (prims->YUV444ToRGB_8u_P3AC4R(
			        pYUVPoint, iStride, pDstPoint, nDstStep,
			        DstFormat, &roi) != PRIMITIVES_SUCCESS)
			{
				return FALSE;
			}
		}
		else
		{
			if (prims->YUV420ToRGB_8u_P3AC4R(
			        pYUVPoint, iStride, pDstPoint, nDstStep,
			        DstFormat, &roi) != PRIMITIVES_SUCCESS)
				return FALSE;
		}
	}

	return TRUE;
}

INT32 avc420_decompress(H264_CONTEXT* h264, const BYTE* pSrcData, UINT32 SrcSize,
                        BYTE* pDstData, DWORD DstFormat, UINT32 nDstStep,
                        UINT32 nDstWidth, UINT32 nDstHeight,
                        RECTANGLE_16* regionRects, UINT32 numRegionRects)
{
	int status;

	if (!h264)
		return -1001;

	status = h264->subsystem->Decompress(h264, pSrcData, SrcSize);

	if (status == 0)
		return 1;

	if (status < 0)
		return status;

	if (!avc_yuv_to_rgb(h264, regionRects, numRegionRects, nDstWidth,
	                    nDstHeight, nDstStep, pDstData, DstFormat, FALSE))
		return -1002;

	return 1;
}

INT32 avc420_compress(H264_CONTEXT* h264, const BYTE* pSrcData, DWORD SrcFormat,
                      UINT32 nSrcStep, UINT32 nSrcWidth, UINT32 nSrcHeight,
                      BYTE** ppDstData, UINT32* pDstSize)
{
	int status = -1;
	prim_size_t roi;
	int nWidth, nHeight;
	primitives_t* prims = primitives_get();
	UINT32* iStride;
	BYTE** pYUVData;

	if (!h264)
		return -1;

	if (!h264->subsystem->Compress)
		return -1;

	iStride =  h264->iStride;
	pYUVData = h264->pYUVData;
	nWidth = (nSrcWidth + 1) & ~1;
	nHeight = (nSrcHeight + 1) & ~1;

	if (!(pYUVData[0] = (BYTE*) _aligned_malloc(nWidth * nHeight, 16)))
		return -1;

	iStride[0] = nWidth;

	if (!(pYUVData[1] = (BYTE*) _aligned_malloc(nWidth * nHeight, 16)))
		goto error_1;

	iStride[1] = nWidth / 2;

	if (!(pYUVData[2] = (BYTE*) _aligned_malloc(nWidth * nHeight, 16)))
		goto error_2;

	iStride[2] = nWidth / 2;
	roi.width = nSrcWidth;
	roi.height = nSrcHeight;
	prims->RGBToYUV420_8u_P3AC4R(pSrcData, SrcFormat, nSrcStep, pYUVData, iStride,
	                             &roi);
	status = h264->subsystem->Compress(h264, ppDstData, pDstSize);
	_aligned_free(pYUVData[2]);
	pYUVData[2] = NULL;
error_2:
	_aligned_free(pYUVData[1]);
	pYUVData[1] = NULL;
error_1:
	_aligned_free(pYUVData[0]);
	pYUVData[0] = NULL;
	return status;
}

INT32 avc444_compress(H264_CONTEXT* h264, const BYTE* pSrcData, DWORD SrcFormat,
                      UINT32 nSrcStep, UINT32 nSrcWidth, UINT32 nSrcHeight,
                      BYTE* op, BYTE** ppDstData, UINT32* pDstSize,
                      BYTE** ppAuxDstData, UINT32* pAuxDstSize)
{
	return -1;
}


static BOOL avc444_ensure_buffer(H264_CONTEXT* h264,
                                 DWORD nDstHeight)
{
	UINT32 x;
	const UINT32* piMainStride = h264->iStride;
	UINT32* piDstSize = h264->iYUV444Size;
	UINT32* piDstStride = h264->iYUV444Stride;
	BYTE** ppYUVDstData = h264->pYUV444Data;
	UINT32 padDstHeight = nDstHeight + 16; /* Need alignment to 16x16 blocks */

	if ((piMainStride[0] != piDstStride[0]) ||
	    (piDstSize[0] != piMainStride[0] * padDstHeight))
	{
		for (x = 0; x < 3; x++)
		{
			piDstStride[x] = piMainStride[0];
			piDstSize[x] = piDstStride[x] * padDstHeight;
			_aligned_free(ppYUVDstData[x]);
			ppYUVDstData[x] = _aligned_malloc(piDstSize[x], 16);

			if (!ppYUVDstData[x])
				goto fail;

			memset(ppYUVDstData[x], 0, piDstSize[x]);
		}
	}

	for (x = 0; x < 3; x++)
	{
		if (!ppYUVDstData[x] || (piDstSize[x] == 0) || (piDstStride[x] == 0))
		{
			WLog_ERR(TAG, "YUV buffer not initialized! check your decoder settings");
			goto fail;
		}
	}

	return TRUE;
fail:
	_aligned_free(ppYUVDstData[0]);
	_aligned_free(ppYUVDstData[1]);
	_aligned_free(ppYUVDstData[2]);
	ppYUVDstData[0] = NULL;
	ppYUVDstData[1] = NULL;
	ppYUVDstData[2] = NULL;
	return FALSE;
}

static BOOL avc444_process_rects(H264_CONTEXT* h264, const BYTE* pSrcData,
                                 UINT32 SrcSize, BYTE* pDstData, UINT32 DstFormat, UINT32 nDstStep,
                                 UINT32 nDstWidth, UINT32 nDstHeight,
                                 const RECTANGLE_16* rects, UINT32 nrRects,
                                 BOOL main)
{
	const primitives_t* prims = primitives_get();
	UINT32 x;
	const BYTE* pYUVPoint[3] = { NULL, NULL, NULL };
	BYTE* pYUVDstPoint[3];
	UINT32* piDstStride = h264->iYUV444Stride;
	BYTE** ppYUVDstData = h264->pYUV444Data;
	const UINT32* piStride = h264->iStride;
	BYTE** ppYUVData = h264->pYUVData;

	if (h264->subsystem->Decompress(h264, pSrcData, SrcSize) < 0)
		return FALSE;

	if (!avc444_ensure_buffer(h264, nDstHeight))
		return FALSE;

	for (x = 0; x < nrRects; x++)
	{
		const RECTANGLE_16* rect = &rects[x];
		prim_size_t roi;

		if (!check_rect(h264, rect, nDstWidth, nDstHeight))
			continue;

		pYUVPoint[0] = ppYUVData[0] + rect->top * piStride[0] +
		               rect->left;
		pYUVPoint[1] = ppYUVData[1] + rect->top / 2 * piStride[1] +
		               rect->left / 2;
		pYUVPoint[2] = ppYUVData[2] + rect->top / 2 * piStride[2] +
		               rect->left / 2;
		pYUVDstPoint[0] = ppYUVDstData[0] + rect->top * piDstStride[0] +
		                  rect->left;
		pYUVDstPoint[1] = ppYUVDstData[1] + rect->top * piDstStride[1] +
		                  rect->left;
		pYUVDstPoint[2] = ppYUVDstData[2] + rect->top * piDstStride[2] +
		                  rect->left;
		roi.width = rect->right - rect->left + 1;
		roi.height = rect->bottom - rect->top + 1;

		if (main)
		{
			if (prims->YUV420CombineToYUV444(pYUVPoint, piStride,
			                                 NULL, NULL,
			                                 pYUVDstPoint, piDstStride,
			                                 &roi) != PRIMITIVES_SUCCESS)
				return FALSE;
		}
		else
		{
			if (prims->YUV420CombineToYUV444(NULL, NULL,
			                                 pYUVPoint, piStride,
			                                 pYUVDstPoint, piDstStride,
			                                 &roi) != PRIMITIVES_SUCCESS)
				return FALSE;
		}
	}

	if (!avc_yuv_to_rgb(h264, rects, nrRects, nDstWidth,
	                    nDstHeight, nDstStep, pDstData, DstFormat, TRUE))
		return FALSE;

	return TRUE;
}

#if defined(AVC444_FRAME_STAT)
static UINT64 op1 = 0;
static double op1sum = 0;
static UINT64 op2 = 0;
static double op2sum = 0;
static UINT64 op3 = 0;
static double op3sum = 0;
static double avg(UINT64* count, double old, double size)
{
	double tmp = size + *count * old;
	(*count)++;
	tmp = tmp / *count;
	return tmp;
}
#endif

INT32 avc444_decompress(H264_CONTEXT* h264, BYTE op,
                        RECTANGLE_16* regionRects, UINT32 numRegionRects,
                        const BYTE* pSrcData, UINT32 SrcSize,
                        RECTANGLE_16* auxRegionRects, UINT32 numAuxRegionRect,
                        const BYTE* pAuxSrcData, UINT32 AuxSrcSize,
                        BYTE* pDstData, DWORD DstFormat,
                        UINT32 nDstStep, UINT32 nDstWidth, UINT32 nDstHeight)
{
	INT32 status = -1;

	if (!h264 || !regionRects ||
	    !pSrcData || !pDstData)
		return -1001;

	switch (op)
	{
		case 0: /* YUV420 in stream 1
		 * Chroma420 in stream 2 */
			if (!avc444_process_rects(h264, pSrcData, SrcSize, pDstData, DstFormat, nDstStep, nDstWidth,
			                          nDstHeight,
			                          regionRects, numRegionRects, TRUE))
				status = -1;
			else if (!avc444_process_rects(h264, pAuxSrcData, AuxSrcSize, pDstData, DstFormat, nDstStep,
			                               nDstWidth, nDstHeight,
			                               auxRegionRects, numAuxRegionRect, FALSE))
				status = -1;
			else
				status = 0;

			break;

		case 2: /* Chroma420 in stream 1 */
			if (!avc444_process_rects(h264, pSrcData, SrcSize, pDstData, DstFormat, nDstStep, nDstWidth,
			                          nDstHeight,
			                          regionRects, numRegionRects, FALSE))
				status = -1;
			else
				status = 0;

			break;

		case 1: /* YUV420 in stream 1 */
			if (!avc444_process_rects(h264, pSrcData, SrcSize, pDstData, DstFormat, nDstStep, nDstWidth,
			                          nDstHeight,
			                          regionRects, numRegionRects, TRUE))
				status = -1;
			else
				status = 0;

			break;

		default: /* WTF? */
			break;
	}

#if defined(AVC444_FRAME_STAT)

	switch (op)
	{
		case 0:
			op1sum = avg(&op1, op1sum, SrcSize + AuxSrcSize);
			break;

		case 1:
			op2sum = avg(&op2, op2sum, SrcSize);
			break;

		case 2:
			op3sum = avg(&op3, op3sum, SrcSize);
			break;

		default:
			break;
	}

	WLog_INFO(TAG,
	          "luma=%"PRIu64" [avg=%lf] chroma=%"PRIu64" [avg=%lf] combined=%"PRIu64" [avg=%lf]",
	          op1, op1sum, op2, op2sum, op3, op3sum);
#endif
	return status;
}

BOOL h264_context_init(H264_CONTEXT* h264)
{
#if defined(_WIN32) && defined(WITH_MEDIA_FOUNDATION)

	if (g_Subsystem_MF.Init(h264))
	{
		h264->subsystem = &g_Subsystem_MF;
		return TRUE;
	}

#endif
#ifdef WITH_LIBAVCODEC

	if (g_Subsystem_libavcodec.Init(h264))
	{
		h264->subsystem = &g_Subsystem_libavcodec;
		return TRUE;
	}

#endif
#ifdef WITH_OPENH264

	if (g_Subsystem_OpenH264.Init(h264))
	{
		h264->subsystem = &g_Subsystem_OpenH264;
		return TRUE;
	}

#endif
#ifdef WITH_X264

	if (g_Subsystem_x264.Init(h264))
	{
		h264->subsystem = &g_Subsystem_x264;
		return TRUE;
	}

#endif
	h264->subsystem = &g_Subsystem_dummy;
	return TRUE;
}

BOOL h264_context_reset(H264_CONTEXT* h264, UINT32 width, UINT32 height)
{
	if (!h264)
		return FALSE;

	h264->width = width;
	h264->height = height;
	return TRUE;
}

H264_CONTEXT* h264_context_new(BOOL Compressor)
{
	H264_CONTEXT* h264;
	h264 = (H264_CONTEXT*) calloc(1, sizeof(H264_CONTEXT));

	if (h264)
	{
		h264->Compressor = Compressor;

		if (Compressor)
		{
			/* Default compressor settings, may be changed by caller */
			h264->BitRate = 1000000;
			h264->FrameRate = 30;
		}

		if (!h264_context_init(h264))
		{
			free(h264);
			return NULL;
		}
	}

	return h264;
}

void h264_context_free(H264_CONTEXT* h264)
{
	if (h264)
	{
		h264->subsystem->Uninit(h264);
		_aligned_free(h264->pYUV444Data[0]);
		_aligned_free(h264->pYUV444Data[1]);
		_aligned_free(h264->pYUV444Data[2]);
		free(h264);
	}
}
