Concatenate two AVI files using IltmmMultiStreamSource and IltmmMultiStreamTarget Example for C

#define MAKE_MEDIA_PATH(pFileName) (TEXT("C:\\Program Files (x86)\\LEAD Technologies\\LEADTOOLS 19\\Media\\")TEXT(pFileName)) 
LPOLESTR T2OLE(LPCTSTR lpt) 
{ 
   static OLECHAR lpw[512]; 
   if(!lpt) 
      return NULL; 
   lpw[0] = L'\0'; 
   MultiByteToWideChar(CP_ACP, 0, lpt, -1, lpw, 512); 
   return lpw; 
} 
void ConvertFile(IltmmConvert* pConvert1, IltmmMultiStreamTarget* pMSTarget, IltmmMultiStreamSource* pMSSource, long* plStartHi , long *plStartLo) 
{ 
   IltmmMediaSampleDisp* pmsSrc = NULL; 
   IltmmMediaSampleDisp* pmsDst = NULL; 
   long LastStartHi; 
   long LastStartLo; 
   long LastStopHi; 
   long LastStopLo; 
   long lSampleStream; 
   HRESULT hr; 
   long lActualDataLength; 
   VARIANT vBuffer; 
   VARIANT_BOOL vBool; 
   LastStopHi = 0; 
   LastStopLo = 0; 
   for(;;) 
   { 
      // get the sample, allowing 10 seconds for the operation to complete 
      hr = IltmmMultiStreamTarget_WaitForSample(pMSTarget, 1000, &lSampleStream); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMultiStreamTarget_GetSample(pMSTarget, lSampleStream, 0, &pmsSrc); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMultiStreamSource_GetSampleBuffer(pMSSource, lSampleStream, 2000, &pmsDst); 
      if (FAILED(hr)) 
         break; 
      // set the sample time 
      IltmmMediaSampleDisp_GetTime(pmsSrc, &LastStartHi, &LastStartLo, &LastStopHi, &LastStopLo); 
      // get the sample time 
      IltmmMediaSampleDisp_SetTime(pmsDst, *plStartHi + LastStartHi, *plStartLo + LastStartLo, *plStartHi + LastStopHi, *plStartLo + LastStopLo); 
      // copy the data 
      IltmmMediaSampleDisp_get_ActualDataLength(pmsSrc, &lActualDataLength); 
      IltmmMediaSampleDisp_GetData(pmsSrc, lActualDataLength, &vBuffer); 
      IltmmMediaSampleDisp_SetData(pmsDst, lActualDataLength, vBuffer); 
      // copy the other flags 
      hr = IltmmMediaSampleDisp_get_Discontinuity(pmsSrc, &vBool); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMediaSampleDisp_put_Discontinuity(pmsDst, vBool); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMediaSampleDisp_get_Preroll(pmsSrc, &vBool); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMediaSampleDisp_put_Preroll(pmsDst, vBool); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMediaSampleDisp_get_SyncPoint(pmsSrc, &vBool); 
      if (FAILED(hr)) 
         break; 
      hr = IltmmMediaSampleDisp_put_SyncPoint(pmsDst, vBool); 
      if (FAILED(hr)) 
         break; 
      // release the source sample 
      IltmmMediaSampleDisp_Release(pmsSrc); 
      pmsSrc = NULL; 
      // deliver the destination sample 
      IltmmMultiStreamSource_DeliverSample(pMSSource, lSampleStream, 1000, pmsDst); 
      // release the destination sample 
      IltmmMediaSampleDisp_Release(pmsDst); 
      pmsDst = NULL; 
   } 
   IltmmConvert_StopConvert(pConvert1); 
   *plStartHi = LastStopHi; 
   *plStartLo = LastStopLo; 
} 
int ConcatenateTwoAVIfilesExample ( void ) 
{ 
   IltmmConvert* pConvert1 = NULL; 
   IltmmConvert* pConvert2 = NULL; 
   IltmmMultiStreamTarget* pMSTarget = NULL; 
   IltmmMultiStreamSource* pMSSource = NULL; 
   long lStartLo, lStartHi; 
   IltmmMediaTypeDisp* pmt = NULL; 
   IltmmMediaTypeDisp* pInsertedMediaType; 
   BSTR  bstr; 
   HRESULT hr; 
   long lState; 
   CoInitialize(NULL); 
   hr = CoCreateInstance(&CLSID_ltmmConvert, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmConvert, (void**) &pConvert1); 
   if(FAILED(hr)) 
   { 
      MessageBox(0, "Cannot instantiate convert library", "Error", 0); 
      return -1; 
   } 
   hr = CoCreateInstance(&CLSID_ltmmConvert, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmConvert, (void**) &pConvert2); 
   if(FAILED(hr)) 
   { 
      MessageBox(0, "Cannot instantiate convert library", "Error", 0); 
      return -1; 
   } 
   hr = CoCreateInstance(&CLSID_ltmmMultiStreamTarget, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmMultiStreamTarget, (void**) &pMSTarget); 
   if(FAILED(hr)) 
   { 
      MessageBox(0, "Cannot instantiate convert library", "Error", 0); 
      return -1; 
   } 
   hr = CoCreateInstance(&CLSID_ltmmMultiStreamSource, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmMultiStreamSource, (void**) &pMSSource); 
   if(FAILED(hr)) 
   { 
      MessageBox(0, "Cannot instantiate convert library", "Error", 0); 
      return -1; 
   } 
   // set the start time to be 0 
   lStartHi = 0; 
   lStartLo = 0; 
   // set the input filename 
   bstr = T2OLE(MAKE_MEDIA_PATH("Src1.avi")); 
   IltmmConvert_put_SourceFile(pConvert1, bstr); 
   SysFreeString(bstr); 
   // set the output sample to a target object 
   IltmmMultiStreamTarget_put_StreamCount(pMSTarget, 2); 
   hr = CoCreateInstance(&CLSID_ltmmMediaType, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmMediaTypeDisp, (void**) &pmt); 
   if(FAILED(hr)) 
   { 
      MessageBox(0, "Cannot instantiate convert library", "Error", 0); 
      return -1; 
   } 
   IltmmMediaTypeDisp_put_Type(pmt, ltmmMEDIATYPE_Video); 
   IltmmMultiStreamTarget_SetAcceptedMediaType(pMSTarget, 0, pmt); 
   IltmmMediaTypeDisp_put_Type(pmt, ltmmMEDIATYPE_Audio); 
   IltmmMultiStreamTarget_SetAcceptedMediaType(pMSTarget, 1, pmt); 
   IltmmMediaTypeDisp_Release(pmt); 
   pmt = NULL; 
   // get the inserted media type for the first stream 
   IltmmMultiStreamTarget_GetAcceptedMediaType(pMSTarget, 0, &pInsertedMediaType); 
   IltmmMediaTypeDisp_Release(pInsertedMediaType); 
   pInsertedMediaType = NULL; 
   hr = IltmmConvert_put_TargetObject(pConvert1, pMSTarget); 
   // START the source conversion, so we can get the media sample format 
   hr = IltmmConvert_StartConvert(pConvert1); 
   //INITIALIZE pConvert2 
   // get the output media sample format and put it into the source object 
   IltmmMultiStreamSource_put_StreamCount(pMSSource, 2); 
   hr = IltmmMultiStreamTarget_GetConnectedMediaType (pMSTarget, 0, &pmt); 
   IltmmMultiStreamSource_SetMediaType(pMSSource, 0, pmt); 
   IltmmMediaTypeDisp_Release(pmt); 
   pmt = NULL; 
   IltmmMultiStreamTarget_GetConnectedMediaType(pMSTarget, 1, &pmt); 
   IltmmMultiStreamSource_SetMediaType(pMSSource, 1, pmt); 
   IltmmMediaTypeDisp_Release(pmt); 
   pmt = NULL; 
   // get the inserted media type for the first stream 
   IltmmMultiStreamSource_GetMediaType(pMSSource, 0, &pInsertedMediaType); 
   IltmmMediaTypeDisp_Release(pInsertedMediaType); 
   pInsertedMediaType = NULL; 
   // set the output filename 
   bstr = T2OLE(MAKE_MEDIA_PATH("Dest.avi")); 
   IltmmConvert_put_TargetFile(pConvert2, bstr); 
   SysFreeString(bstr); 
   IltmmConvert_put_SourceObject(pConvert2, pMSSource); 
   // start the dest conversion 
   IltmmConvert_StartConvert(pConvert2); 
   // convert the first file 
   ConvertFile(pConvert1, pMSTarget, pMSSource, &lStartHi, &lStartLo); 
   /* 
   Restrict the output format to the media type of the source for the first file. 
   That is because the two files must have the same media type for both video and audio. 
   With video, you have to make sure the files have the same frame rate! Minor changes in 
   the frame rate might make the connection fail! 
   The control will tolerate differences in frame rate if you comment the next line. 
   */ 
   IltmmMultiStreamTarget_GetConnectedMediaType(pMSTarget, 0, &pmt); 
   IltmmMultiStreamTarget_SetAcceptedMediaType(pMSTarget, 0, pmt); 
   IltmmMediaTypeDisp_Release(pmt); 
   pmt = NULL; 
   IltmmMultiStreamTarget_GetConnectedMediaType(pMSTarget, 1, &pmt); 
   IltmmMultiStreamTarget_SetAcceptedMediaType(pMSTarget, 1, pmt); 
   IltmmMediaTypeDisp_Release(pmt); 
   pmt = NULL; 
   // change the source file to the second file 
   bstr = T2OLE(MAKE_MEDIA_PATH("Src2.avi")); 
   IltmmConvert_put_SourceFile(pConvert1, bstr); 
   SysFreeString(bstr); 
   // start converting again 
   IltmmConvert_StartConvert(pConvert1); 
   // convert the second file 
   ConvertFile(pConvert1, pMSTarget, pMSSource, &lStartHi, &lStartLo); 
   // deliver the end of the sample to stop the conversion 
   IltmmMultiStreamSource_DeliverEndOfStream(pMSSource, 0, 1000); 
   IltmmMultiStreamSource_DeliverEndOfStream(pMSSource, 1, 1000); 
   IltmmConvert_get_State(pConvert2, &lState); 
   if (lState == ltmmConvert_State_Running) 
      IltmmConvert_StopConvert(pConvert2); 
   // free the source and target objects 
   IltmmConvert_ResetTarget(pConvert1); 
   IltmmConvert_ResetSource(pConvert2); 
   if (pConvert1) 
   { 
      IltmmConvert_Release(pConvert1); 
      pConvert1 = NULL; 
   } 
   if (pConvert2) 
   { 
      IltmmConvert_Release(pConvert2); 
      pConvert2 = NULL; 
   } 
   if (pMSSource) 
   { 
      IltmmMultiStreamSource_Release(pMSSource); 
      pMSSource = NULL; 
   } 
   if (pMSTarget) 
   { 
      IltmmMultiStreamTarget_Release(pMSTarget); 
      pMSTarget = NULL; 
   } 
   CoUninitialize(); 
   return 0; 
}