Render video from OpenCV Mat by using Direct3d

mainwindow.h

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#include "vren_thread.h"
 
class MainWindow : public QMainWindow
{
	Q_OBJECT
	...
	vren_thread vren_;
};

mainwindow.c

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#include "mainwindow.h"
#include <opencv2/opencv.hpp>
#include <opencv2/imgproc/types_c.h>
 
void CALLBACK DecCBFun(long nPort, char* pBuf, long nSize, FRAME_INFO* pFrameInfo, long nReserved1, long nReserved2)
{
	long lFrameType = pFrameInfo->nType;
 
	if (lFrameType == T_YV12)
	{
		MainWindow* win = port2MainWindow[nPort];
		if (nullptr == win)
		{
			qDebug() << "lookup main window from " << nPort << " failed.";
			return;
		}
 
		win->realYuvCallback(pBuf, nSize, pFrameInfo->nStamp, pFrameInfo->nWidth, pFrameInfo->nHeight);
	}
}
 
void MainWindow::realYuvCallback(const char* pBuf, int len, int64_t nStamp, int width, int height)
{
	cv::Mat dst(height, width, CV_8UC3);
	cv::Mat src(height + height / 2, width, CV_8UC1, (uchar*)pBuf);
	cv::cvtColor(src, dst, CV_YUV2RGBA_YV12); // CV_YUV2BGR_YV12);
	cv::line(dst, cv::Point(0, 0), cv::Point(100, 100), cv::Scalar(255, 0, 0), 10);
 
	vren_.Render_d3d(dst);
}
 
void CALLBACK fRealDataCallBack(LONG lRealHandle, DWORD dwDataType, BYTE* pBuffer, DWORD dwBufSize, void* pUser)
{
	MainWindow* pThis = (MainWindow*)pUser;
	pThis->realDataCallback(lRealHandle, dwDataType, pBuffer, dwBufSize);
}
 
void MainWindow::realDataCallback(LONG lRealHandle, DWORD dwDataType, BYTE* pBuffer, DWORD dwBufSize)
{
	DWORD dRet = 0;
	BOOL inData = FALSE;
 
	switch (dwDataType)
	{
	case NET_DVR_SYSHEAD:
		if (!PlayM4_GetPort(&port_))
		{
			break;
		}
 
		port2MainWindow[port_] = this;
		playWnd_ = (HWND)ui->widgetVideo->winId();
		vren_.SetParam(playWnd_);
 
		if (!PlayM4_OpenStream(port_, pBuffer, dwBufSize, 1024 * 1024))
		{
			dRet = PlayM4_GetLastError(port_);
			break;
		}
 
		if (!PlayM4_SetDecCallBackEx(port_, DecCBFun, NULL, NULL))
		{
			dRet = PlayM4_GetLastError(port_);
			break;
		}
 
		if (!PlayM4_Play(port_, NULL)) // playWnd_))
		{
			dRet = PlayM4_GetLastError(port_);
			break;
		}
	}
}

vren_thread.h

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