Use ltmmMemory for Memory Conversion Example for C

#define WM_CONVERTNOTIFY (WM_USER+1) 
 
IltmmConvert *g_pConvert; 
IltmmMemory  *g_pSource; 
IltmmMemory  *g_pTarget; 
 
HRESULT SetAVIRecompression(HWND hwndParent); 
 
void UseltmmMemoryForMemoryConversion_Example (HWND hWnd) 
{ 
   {//1. Create a convert object, g_pSource and g_pTarget objects: 
 
      // create a convert object, g_pSource and g_pTarget memory objects 
      CoCreateInstance(&CLSID_ltmmConvert,  
                       NULL,  
                       CLSCTX_INPROC_SERVER,  
                       &IID_IltmmConvert,  
                       (void**) &g_pConvert);  
 
      CoCreateInstance(&CLSID_ltmmMemory,  
                       NULL,  
                       CLSCTX_INPROC_SERVER,  
                       &IID_IltmmMemory,  
                       (void**) &g_pSource);  
 
      CoCreateInstance(&CLSID_ltmmMemory,  
                       NULL,  
                       CLSCTX_INPROC_SERVER,  
                       &IID_IltmmMemory,  
                       (void**) &g_pTarget);  
 
   }//1. Create a convert object, g_pSource and g_pTarget objects: 
 
   // set notify window 
   IltmmConvert_SetNotifyWindow(g_pConvert, (long)hWnd, WM_CONVERTNOTIFY);  
 
   {//2.	Setup the g_pSource object, pre-load it with data: 
 
      SAFEARRAY sa;  
      VARIANT var;  
      UCHAR arr [100]; 
      long fl = 100; 
 
 
      // Set the buffer size 
      IltmmMemory_put_BufferSize (g_pSource, fl);  
 
      // pass data from the arr BYTE array...  
      memset(&sa, 0, sizeof(sa));  
      sa.cbElements = sizeof(unsigned char);  
      sa.cDims = 1;  
      sa.fFeatures = (FADF_AUTO | FADF_FIXEDSIZE);  
      sa.pvData = arr; //data to fill 
      sa.rgsabound[0].cElements = fl;  
      VariantInit(&var);  
      V_VT(&var) = (VT_ARRAY | VT_UI1);  
      V_ARRAY(&var) = &sa;  
 
      IltmmMemory_SetData (g_pSource, 0, fl, var);  
 
   }//2.	Setup the g_pSource object, preload it with data: 
 
   // Set input memory object 
   IltmmConvert_put_SourceStream(g_pConvert, g_pSource);  
 
   // Set output memory object 
   IltmmConvert_put_TargetStream(g_pConvert, g_pTarget);  
 
   // Set recompression 
   SetAVIRecompression(NULL);  
 
   // Start conversion 
   IltmmConvert_StartConvert (g_pConvert);  
} 
 
// 
// SetAVIRecompression 
// sets up LEAD video compression, MP3 audio compression, and AVI file output 
// 
// hwndParent = parent window for compressor property dialog boxes 
// 
HRESULT SetAVIRecompression(HWND hwndParent)  
{ 
   IltmmCompressors *pCompressors;  
   long index;  
   VARIANT_BOOL f;  
   BSTR bstr;  
 
   // select the LEAD video compressor 
   IltmmConvert_get_VideoCompressors(g_pConvert, &pCompressors);  
 
   bstr = SysAllocString(L"@device:sw:{33D9A760-90C8-11D0-BD43-00A0C911CE86}\\LEAD MCMP/MJPEG Codec (2.0)"); 
 
   IltmmCompressors_Find (pCompressors , bstr, &index);  
 
   SysFreeString(bstr);  
 
   if(index < 0)  
   { 
      // compressor isn't registered 
      IltmmCompressors_Release (pCompressors);  
 
      return E_FAIL;  
   } 
   IltmmCompressors_put_Selection (pCompressors, index);  
   IltmmCompressors_Release(pCompressors);  
 
   // select the MP3 audio video compressor 
   IltmmConvert_get_AudioCompressors(g_pConvert, &pCompressors);  
   bstr = SysAllocString(L"@device:cm:{33D9A761-90C8-11D0-BD43-00A0C911CE86}\\85MPEG Layer-3"); 
   IltmmCompressors_Find(pCompressors, bstr, &index);  
   SysFreeString(bstr);  
   if(index < 0)  
   { 
      // compressor isn't registered 
      IltmmCompressors_Release (pCompressors);  
      return E_FAIL;  
   } 
 
   IltmmCompressors_put_Selection (pCompressors, index);  
   IltmmCompressors_Release(pCompressors);  
 
   // set output format to AVI 
   IltmmConvert_put_TargetFormat (g_pConvert, ltmmConvert_TargetFormat_Avi);  
 
   // set video compressor properties 
   IltmmConvert_HasDialog(g_pConvert, ltmmConvert_Dlg_VideoCompressor, &f);  
   if(f)  
      IltmmConvert_ShowDialog (g_pConvert, ltmmConvert_Dlg_VideoCompressor, (long) hwndParent);  
 
   // set audio compressor properties 
   IltmmConvert_HasDialog(g_pConvert, ltmmConvert_Dlg_AudioCompressor, &f);  
   if(f)  
      IltmmConvert_ShowDialog(g_pConvert, ltmmConvert_Dlg_AudioCompressor, (long) hwndParent);  
 
   return S_OK;  
} 
 
//3. Handle the notification window to plot the data and save it to a file: 
LRESULT OnConvertNotify(WPARAM wParam, LPARAM lParam)  
{ 
   lParam = lParam ; 
 
   switch(wParam)  
   { 
      case ltmmConvert_Notify_Complete:  
      { 
         // Indicates a successful completion of the conversion process.  
 
         HANDLE hFile = NULL;  
         long fl = 0;  
         unsigned long lBytesWritten;  
         IltmmMemory *pTarget = NULL;  
         VARIANT varData;  
         unsigned char *pBuffer = NULL;  
         SAFEARRAY sa;  
 
         // write the data to a file 
         hFile = CreateFile( MAKE_MEDIA_PATH("Target.avi"),      // open file name  
                             GENERIC_WRITE,         // open for writing  
                             FILE_SHARE_READ,       // share for reading  
                             NULL,                  // no security  
                             CREATE_ALWAYS,         // re-create the file 
                             FILE_ATTRIBUTE_NORMAL, // normal file  
                             NULL);                 // no attr. template  
 
         IltmmConvert_get_TargetStream(g_pConvert, (IUnknown**)&pTarget);  
 
         if(!pTarget)  
            break;  
 
         IltmmMemory_get_BufferSize(pTarget, &fl);  
 
         VariantInit(&varData);  
 
         // pass data 
         memset(&sa, 0, sizeof(sa));  
         sa.cbElements = sizeof(unsigned char);  
         sa.cDims = 1;  
         sa.fFeatures = (FADF_AUTO | FADF_FIXEDSIZE);  
         sa.pvData = (UCHAR*) malloc(fl*sizeof (UCHAR));  
         sa.rgsabound[0].cElements = fl;  
         V_VT(&varData) = (VT_ARRAY | VT_UI1);  
         V_ARRAY(&varData) = &sa;  
 
         // 
         // To lock the buffer for synchronization, use the following  
         // line instead of the line below :  
         // IltmmMemory_LockBuffer (pTarget, &varData);  
         // or 
         // IltmmMemory_LockRegion (pTarget, 0, fl, &varData);  
         // You may also use the IltmmMemory_GetData() function 
         // To get the data without allocating a SAFEARRAY :  
         // IltmmMemory_GetData (pTarget, 0, fl, &varData);  
         // 
 
         IltmmMemory_CopyData(pTarget, 0, fl, &varData);  
 
         SafeArrayAccessData(V_ARRAY(&varData), (void**)&pBuffer);  
 
         WriteFile(hFile, pBuffer, fl, &lBytesWritten, NULL);  
 
         {// Plot data on screen 
 
            char dataPlot[255];  
            char data[20];  
            short sData;  
            int i; 
 
            dataPlot[0] = '\0' ; 
 
            for(i=0; i<fl ; i++) 
            { 
               IltmmMemory_GetByte (pTarget, i, &sData);  
 
               strcat (dataPlot,"0x");  
               strcat (dataPlot,ltoa(sData, data, 16));  
               strcat (dataPlot,"  ");  
            } 
 
            printf ("%s", dataPlot);  
 
         }// Plot data on screen 
 
         // if IltmmMemory_LockBuffer() or  
         // IltmmMemory_LockRegion() is used,  
         // IltmmMemory_Unloack() must be called :  
         // IltmmMemory_Unlock (pTarget);  
 
         SafeArrayUnaccessData(V_ARRAY(&varData));  
 
         VariantClear(&varData);  
 
         CloseHandle(hFile);  
 
         IltmmMemory_Release(pTarget);  
      } 
 
      break;  
   } 
 
   return 0;  
} 
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