海康转码

//解码回调 视频为YUV数据(YV12)，音频为PCM数据void CALLBACK DecCBFun(long nPort,char * pBuf,long nSize,FRAME_INFO * pFrameInfo, long nReserved1,long nReserved2){ long lFrameType = pFrameInfo->nType;  if(lFrameType ==T_YV12)  {Mat frame;frame.create(Size(pFrameInfo->nWidth, pFrameInfo->nHeight),CV_8UC1);memcpy(frame.data, pBuf, pFrameInfo->nWidth*pFrameInfo->nHeight);imshow("IP Camera", frame);waitKey(1);  }}///实时流回调void CALLBACK fRealDataCallBack(LONG lRealHandle,DWORD dwDataType,BYTE *pBuffer,DWORD dwBufSize,void *pUser){  DWORD dRet;  switch (dwDataType)  {  case NET_DVR_SYSHEAD:    //系统头    if (!PlayM4_GetPort(&nPort)) //获取播放库未使用的通道号    {      break;    }    if(dwBufSize > 0)    {      if (!PlayM4_OpenStream(nPort,pBuffer,dwBufSize,1024*1024))      {        dRet=PlayM4_GetLastError(nPort);        break;      }      //设置解码回调函数 只解码不显示 if (!PlayM4_SetDecCallBack(nPort,DecCBFun)) { dRet=PlayM4_GetLastError(nPort); break; }          //设置解码回调函数 解码且显示      //if (!PlayM4_SetDecCallBackEx(nPort,DecCBFun,NULL,NULL))      //{      //dRet=PlayM4_GetLastError(nPort);      //break;      //}      //打开视频解码      if (!PlayM4_Play(nPort,hWnd))      {        dRet=PlayM4_GetLastError(nPort);        break;      }      //打开音频解码, 需要码流是复合流      if (!PlayM4_PlaySound(nPort))      {        dRet=PlayM4_GetLastError(nPort);        break;      }    }    break;      case NET_DVR_STREAMDATA:   //码流数据    if (dwBufSize > 0 && nPort != -1)    {      BOOL inData=PlayM4_InputData(nPort,pBuffer,dwBufSize);      while (!inData)      {        Sleep(10);        inData=PlayM4_InputData(nPort,pBuffer,dwBufSize);        OutputDebugString(L"PlayM4_InputData failed \n");      }    }    break;  }}