Recompressing an AVI File to a DV Device for C++

The following code demonstrates how to recompress an AVI file to a DV device:

// include the LEAD Multimedia TOOLKIT header 
#include "ltmm.h" 
 
#include "resource.h" 
#include <tchar.h> 
#include <stdio.h> 
#include <assert.h> 
 
HINSTANCE g_hInstance;         // application instance handle 
IltmmConvert* g_pConvert;      // convert object's interface pointer 
 
// user defined message id used for conversion events 
#define WM_CONVERTNOTIFY (WM_USER + 1000) 
 
// 
// ConvertDlgProc 
// starts the conversion process and provides status feedback 
// 
// controls: 
// IDC_CONVERTSTATUS - static control used for status messages 
// IDC_CONVERTPROGRESS - static control used for conversion progress 
// IDC_USERABORT - button control used to abort the conversion or exit the dialog 
 
BOOL CALLBACK ConvertDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) 
{ 
   TCHAR sz[256]; 
   BSTR bstr1; 
   BSTR bstr2; 
   HRESULT hr; 
   long state; 
   long type; 
   long streams; 
   IltmmVCRControl* pVCR; 
 
 
   switch (msg)  
   { 
   case WM_INITDIALOG: 
      // assign the notification window 
      g_pConvert->SetNotifyWindow((long) hwnd, WM_CONVERTNOTIFY); 
       
      // set the abort button text 
      SetDlgItemText(hwnd, IDC_USERABORT, _T("Abort")); 
 
    
      // uncomment the following line to view the graph in DirectShow GraphEdit 
      // g_pConvert->EditGraph(); 
 
      g_pConvert->get_UnrenderedStreams(&streams); 
      if(streams != 0) 
         MessageBox(hwnd, _T("Not all the streams could be rendered."), _T("Convert"), MB_ICONEXCLAMATION | MB_OK); 
 
      g_pConvert->get_TargetVCRControl(&pVCR); 
      hr = pVCR->Record(); 
      pVCR->Release(); 
 
      if(SUCCEEDED(hr)) 
         Sleep(2000); 
 
      // start the conversion 
      hr = g_pConvert->StartConvert(); 
      if(FAILED(hr)) 
      { 
         _stprintf(sz, _T("conversion error 0x%.8X"), lParam); 
         SetDlgItemText(hwnd, IDC_CONVERTSTATUS, sz); 
         UpdateWindow(GetDlgItem(hwnd, IDC_CONVERTSTATUS)); 
         SetDlgItemText(hwnd, IDC_USERABORT, _T("Exit")); 
         MessageBeep(0); 
 
         // stop, if vcr 
         g_pConvert->get_TargetVCRControl(&pVCR); 
         pVCR->Stop(); 
         pVCR->Release(); 
 
      } 
      return TRUE; 
      break; 
   case WM_DESTROY: 
      // reset the notification window 
      g_pConvert->SetNotifyWindow((long) NULL, 0); 
#ifdef _DEBUG 
   { 
      long state, err, pc; 
      double start, end, dur; 
      TCHAR sz[1024]; 
       
      // get the current state 
      g_pConvert->get_State(&state); 
       
      // get the current state 
      g_pConvert->get_ConvertError(&err); 
 
      // get the amount converted 
      g_pConvert->get_PercentComplete(&pc); 
       
      // get the start 
      g_pConvert->get_SelectionStart(&start); 
 
      // get the end 
      g_pConvert->get_SelectionEnd(&end); 
 
      // get the duration 
      g_pConvert->get_Duration(&dur); 
 
      _stprintf(sz, _T("state = %d, error = 0x%.8X, complete = %d%%, start = %g, end = %g, duration = %g"), state, err, pc, start, end, dur); 
      MessageBox(NULL, sz, _T("debug"), MB_OK); 
   } 
#endif 
    
      break; 
   case WM_COMMAND: 
      switch (LOWORD(wParam)) 
      { 
      case IDC_USERABORT: 
         // user abort... stop conversion 
         g_pConvert->get_State(&state); 
         if(state == ltmmConvert_State_Running) 
            g_pConvert->StopConvert(); 
         else 
         { 
            g_pConvert->get_ConvertError((long*) &hr); 
            EndDialog(hwnd, (long) hr); 
         } 
         return TRUE; 
         break; 
      } 
      break; 
   case WM_CONVERTNOTIFY: 
      switch(wParam) 
      { 
      case ltmmConvert_Notify_Started: 
         // indicate conversion has started 
         g_pConvert->get_SourceType(&type); 
         switch(type) 
         { 
         case ltmmConvert_Source_File: 
            g_pConvert->get_SourceFile(&bstr1); 
            break; 
         case ltmmConvert_Source_HGlobal: 
            bstr1 = SysAllocString(L"[hglobal]"); 
            break; 
         case ltmmConvert_Source_Array: 
            bstr1 = SysAllocString(L"[array]"); 
            break; 
         case ltmmConvert_Source_Object: 
            bstr1 = SysAllocString(L"[object]"); 
            break; 
         } 
         g_pConvert->get_TargetType(&type); 
         switch(type) 
         { 
         case ltmmConvert_Target_File: 
            g_pConvert->get_TargetFile(&bstr2); 
            break; 
         case ltmmConvert_Target_Array: 
            bstr2 = SysAllocString(L"[array]"); 
            break; 
         case ltmmConvert_Target_Object: 
            bstr2 = SysAllocString(L"[object]"); 
            break; 
         case ltmmConvert_Target_Device: 
            bstr2 = SysAllocString(L"[device]"); 
            break; 
         } 
         g_pConvert->get_RenderedStreams(&streams); 
         if((streams & ltmmConvert_Stream_Audio) & !(streams & ltmmConvert_Stream_Video)) 
            _stprintf(sz, _T("recompressing audio from '%ls' to '%ls'..."), bstr1, bstr2); 
         else if(!(streams & ltmmConvert_Stream_Audio) & (streams & ltmmConvert_Stream_Video)) 
            _stprintf(sz, _T("recompressing video from '%ls' to '%ls'..."), bstr1, bstr2); 
         else 
            _stprintf(sz, _T("recompressing '%ls' to '%ls'..."), bstr1, bstr2); 
         SysFreeString(bstr1); 
         SysFreeString(bstr2); 
         SetDlgItemText(hwnd, IDC_CONVERTSTATUS, sz); 
         UpdateWindow(GetDlgItem(hwnd, IDC_CONVERTSTATUS)); 
         break; 
      case ltmmConvert_Notify_Complete: 
         // indicate an conversion complete 
         _stprintf(sz, _T("conversion complete")); 
         SetDlgItemText(hwnd, IDC_CONVERTSTATUS, sz); 
         UpdateWindow(GetDlgItem(hwnd, IDC_CONVERTSTATUS)); 
         SetDlgItemText(hwnd, IDC_USERABORT, _T("Exit")); 
         // stop, if vcr 
         g_pConvert->get_TargetVCRControl(&pVCR); 
         pVCR->Stop(); 
         pVCR->Release(); 
 
         break; 
      case ltmmConvert_Notify_ErrorAbort: 
         // indicate an error 
         _stprintf(sz, _T("conversion error 0x%.8X"), lParam); 
         SetDlgItemText(hwnd, IDC_CONVERTSTATUS, sz); 
         UpdateWindow(GetDlgItem(hwnd, IDC_CONVERTSTATUS)); 
         SetDlgItemText(hwnd, IDC_USERABORT, _T("Exit")); 
         MessageBeep(0); 
         // stop, if vcr 
         g_pConvert->get_TargetVCRControl(&pVCR); 
         pVCR->Stop(); 
         pVCR->Release(); 
 
         break; 
      case ltmmConvert_Notify_UserAbort: 
         // indicate user abort 
         _stprintf(sz, _T("conversion aborted\n")); 
         SetDlgItemText(hwnd, IDC_CONVERTSTATUS, sz); 
         UpdateWindow(GetDlgItem(hwnd, IDC_CONVERTSTATUS)); 
         SetDlgItemText(hwnd, IDC_USERABORT, _T("Exit")); 
         MessageBeep(0); 
         // stop, if vcr 
         g_pConvert->get_TargetVCRControl(&pVCR); 
         pVCR->Stop(); 
         pVCR->Release(); 
         break; 
      case ltmmConvert_Notify_Progress: 
         // indicate conversion progress 
         _stprintf(sz, _T("%3d%% complete"), lParam); 
         SetDlgItemText(hwnd, IDC_CONVERTPROGRESS, sz); 
         UpdateWindow(GetDlgItem(hwnd, IDC_CONVERTPROGRESS)); 
         break; 
      } 
      return TRUE; 
      break; 
   } 
   return FALSE; 
} 
 
// 
// 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 
   g_pConvert->get_VideoCompressors(&pCompressors); 
   bstr = SysAllocString(L"@device:sw:{33D9A760-90C8-11D0-BD43-00A0C911CE86}\\LEAD MCMP/MJPEG Codec (2.0)"); 
   pCompressors->Find(bstr, &index); 
   SysFreeString(bstr); 
   if(index < 0) 
   { 
      // compressor isn't registered 
      pCompressors->Release(); 
      return E_FAIL; 
   } 
   pCompressors->put_Selection(index); 
   pCompressors->Release(); 
    
   // select the MP3 audio video compressor 
   g_pConvert->get_AudioCompressors(&pCompressors); 
   bstr = SysAllocString(L"@device:cm:{33D9A761-90C8-11D0-BD43-00A0C911CE86}\\85MPEG Layer-3"); 
   pCompressors->Find(bstr, &index); 
   SysFreeString(bstr); 
   if(index < 0) 
   { 
      // compressor isn't registered 
      pCompressors->Release(); 
      return E_FAIL; 
   } 
   pCompressors->put_Selection(index); 
   pCompressors->Release(); 
 
   // set output format to AVI 
   g_pConvert->put_TargetFormat(ltmmConvert_TargetFormat_Avi); 
#ifdef _DEBUG 
   { 
      long v; 
      g_pConvert->get_TargetFormat(&v); 
      assert(v == ltmmConvert_TargetFormat_Avi); 
   } 
#endif 
 
   // set video compressor properties 
   g_pConvert->HasDialog(ltmmConvert_Dlg_VideoCompressor, &f); 
   if(f) 
      g_pConvert->ShowDialog(ltmmConvert_Dlg_VideoCompressor, (long) hwndParent); 
    
   // set audio compressor properties 
   g_pConvert->HasDialog(ltmmConvert_Dlg_AudioCompressor, &f); 
   if(f) 
      g_pConvert->ShowDialog(ltmmConvert_Dlg_AudioCompressor, (long) hwndParent); 
 
   return S_OK; 
} 
 
// RecompressFileToDVDevice 
// recompresses file to DV device 
// 
// pszSource = source file path 
// 
// 
HRESULT RecompressFileToDVDevice(LPCTSTR pszSource) 
{ 
   HRESULT hr; 
   BSTR bstr; 
#ifndef _UNICODE 
   WCHAR wsz[MAX_PATH]; 
#endif 
   IltmmTargetDevices* pDevices; 
   IltmmCompressors* pCompressors; 
    
    
   // set source file 
#ifdef _UNICODE 
   bstr = SysAllocString(pszSource); 
#else 
   swprintf(wsz, L"%hs", pszSource); 
   bstr = SysAllocString(wsz); 
#endif 
   hr = g_pConvert->put_SourceFile(bstr); 
   SysFreeString(bstr); 
   if(FAILED(hr)) 
      return hr; 
 
   // set target device 
   hr = g_pConvert->put_TargetFormat(ltmmConvert_TargetFormat_dvsd); 
   if(FAILED(hr)) 
      return hr; 
 
   g_pConvert->get_AudioCompressors(&pCompressors); 
   hr = pCompressors->put_Selection(-1); 
   pCompressors->Release(); 
   if(FAILED(hr)) 
      return hr; 
 
   g_pConvert->get_VideoCompressors(&pCompressors); 
   hr = pCompressors->put_Selection(-1); 
   pCompressors->Release(); 
   if(FAILED(hr)) 
      return hr; 
 
 
   g_pConvert->get_TargetDevices(&pDevices); 
   hr = pDevices->put_Selection(0); 
   pDevices->Release(); 
   if(FAILED(hr)) 
      return hr; 
 
   // do conversion 
   hr = (HRESULT) DialogBox(g_hInstance, (LPCTSTR)IDD_CONVERTDLG, NULL, ConvertDlgProc); 
    
       
   return hr; 
} 
 
int APIENTRY WinMain(HINSTANCE hInstance, 
                HINSTANCE hPrevInstance, 
                LPSTR    lpCmdLine, 
                int    nCmdShow) 
{ 
   HRESULT hr; 
    
   g_hInstance = hInstance; 
 
   // initialize COM library 
   hr = CoInitialize(NULL); 
   if(FAILED(hr)) 
      goto error; 
    
   // create the convert object 
   hr = CoCreateInstance(CLSID_ltmmConvert, NULL, CLSCTX_INPROC_SERVER, IID_IltmmConvert, (void**) &g_pConvert); 
   if(FAILED(hr)) 
      goto error; 
    
    
   hr = RecompressFileToDVDevice(MAKE_MEDIA_PATH("source.avi")); 
   if(FAILED(hr)) 
      goto error; 
 
error: 
   // cleanup 
   if(g_pConvert) 
      g_pConvert->Release(); 
 
   CoUninitialize(); 
    
   return 0; 
} 

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