Recompressing an AVI File Selection for C

The following code demonstrates how to recompress an AVI file selection:

// define helper macros for using interfaces under C 
#ifndef COBJMACROS 
   #define COBJMACROS 
#endif 
 
// include the LEAD Multimedia TOOLKIT header 
#include "ltmm.h" 
 
#include "resource.h" 
#include <tchar.h> 
#include <stdio.h> 
#include <assert.h> 
 
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 = NULL;  
   BSTR bstr2 = NULL;  
   HRESULT hr;  
   long state;  
   long type;  
   long streams;  
   IltmmVCRControl* pVCR;  
 
 
   switch (msg)  
   { 
   case WM_INITDIALOG:  
      // assign the notification window 
      IltmmConvert_SetNotifyWindow (g_pConvert, (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 
      // IltmmConvert_EditGraph(g_pConvert);  
 
      IltmmConvert_get_UnrenderedStreams(g_pConvert, &streams);  
      if(streams != 0)  
         MessageBox(hwnd, _T("Not all the streams could be rendered."), _T("Convert"), MB_ICONEXCLAMATION | MB_OK);  
 
      IltmmConvert_get_TargetVCRControl(g_pConvert, &pVCR);  
      hr = IltmmVCRControl_Record(pVCR);  
      IUnknown_Release(pVCR);  
 
      if(SUCCEEDED(hr))  
         Sleep(2000);  
 
      // start the conversion 
      hr = IltmmConvert_StartConvert (g_pConvert);  
      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 
         IltmmConvert_get_TargetVCRControl(g_pConvert, &pVCR);  
         IltmmVCRControl_Stop (pVCR);  
         IUnknown_Release(pVCR);  
      } 
      return TRUE;  
      break;  
   case WM_DESTROY:  
      // reset the notification window 
 
      IltmmConvert_SetNotifyWindow (g_pConvert, (long) NULL, 0);  
#ifdef _DEBUG 
      { 
         long state, err, pc;  
         double start, end, dur;  
         TCHAR sz[1024];  
 
         // get the current state 
         IltmmConvert_get_State (g_pConvert, &state);  
 
         // get the current state 
         IltmmConvert_get_ConvertError(g_pConvert, &err);  
 
         // get the amount converted 
         IltmmConvert_get_PercentComplete(g_pConvert, &pc);  
 
         // get the start 
         IltmmConvert_get_SelectionStart (g_pConvert, &start);  
 
         // get the end 
         IltmmConvert_get_SelectionEnd(g_pConvert, &end);  
 
         // get the duration 
         IltmmConvert_get_Duration(g_pConvert, &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 
         IltmmConvert_get_State (g_pConvert, &state);  
         if(state == ltmmConvert_State_Running)  
            IltmmConvert_StopConvert(g_pConvert);  
         else 
         { 
            IltmmConvert_get_ConvertError(g_pConvert, (long*) &hr);  
            EndDialog(hwnd, (long) hr);  
         } 
         return TRUE;  
         break;  
      } 
      break;  
   case WM_CONVERTNOTIFY:  
      switch(wParam)  
      { 
      case ltmmConvert_Notify_Started:  
         // indicate conversion has started 
         IltmmConvert_get_SourceType(g_pConvert, &type);  
         switch(type)  
         { 
         case ltmmConvert_Source_File:  
            IltmmConvert_get_SourceFile (g_pConvert, &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;  
         } 
         IltmmConvert_get_TargetType(g_pConvert, &type);  
         switch(type)  
         { 
         case ltmmConvert_Target_File:  
            IltmmConvert_get_TargetFile(g_pConvert, &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;  
         } 
         IltmmConvert_get_RenderedStreams(g_pConvert, &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 
         IltmmConvert_get_TargetVCRControl(g_pConvert, &pVCR);  
         IltmmVCRControl_Stop (pVCR);  
         IUnknown_Release(pVCR);  
         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 
         IltmmConvert_get_TargetVCRControl(g_pConvert, &pVCR);  
         IltmmVCRControl_Stop (pVCR);  
         IUnknown_Release(pVCR);  
 
         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")); 
 
         // stop, if VCR 
         IltmmConvert_get_TargetVCRControl(g_pConvert, &pVCR);  
         IltmmVCRControl_Stop (pVCR);  
         IUnknown_Release(pVCR);  
 
         MessageBeep(0);  
         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 
   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 
      IUnknown_Release(pCompressors);  
      return E_FAIL;  
   } 
   IltmmCompressors_put_Selection(pCompressors, index);  
   IUnknown_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 
      IUnknown_Release(pCompressors);  
      return E_FAIL;  
   } 
   IltmmCompressors_put_Selection(pCompressors, index);  
   IUnknown_Release(pCompressors);  
 
   // set output format to AVI 
   IltmmConvert_put_TargetFormat(g_pConvert, ltmmConvert_TargetFormat_Avi);  
#ifdef _DEBUG 
   { 
      long v;  
      IltmmConvert_get_TargetFormat(g_pConvert, &v);  
      assert(v == ltmmConvert_TargetFormat_Avi);  
   } 
#endif 
 
   // 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;  
} 
// 
// RecompressFileSelection 
// recompresses a file selection using the LEAD video and MP3 audio compressors 
// 
// pszSource = source file path 
// pszTarget = target file path 
// dStart = selection start (fraction of duration)  
// dEnd = selection end (fraction of duration)  
// 
HRESULT RecompressFileSelection(LPCTSTR pszSource, LPCTSTR pszTarget, double dStart, double dEnd, HINSTANCE hInstance)  
{ 
   HRESULT hr;  
   BSTR bstr;  
#ifndef _UNICODE 
   WCHAR wsz[MAX_PATH];  
#endif 
   double duration;    
 
 
   // set source file 
#ifdef _UNICODE 
   bstr = SysAllocString(pszSource);  
#else 
   swprintf(wsz, L"%hs", pszSource);  
   bstr = SysAllocString(wsz);  
#endif 
   hr = IltmmConvert_put_SourceFile(g_pConvert, bstr);  
   SysFreeString(bstr);  
   if(FAILED(hr))  
      return hr;  
 
   // set target file 
#ifdef _UNICODE 
   bstr = SysAllocString(pszTarget);  
#else 
   swprintf(wsz, L"%hs", pszTarget);  
   bstr = SysAllocString(wsz);  
#endif 
   hr = IltmmConvert_put_TargetFile(g_pConvert, bstr);  
   SysFreeString(bstr);  
   if(FAILED(hr))  
      return hr;  
 
   // setup selection 
   hr = IltmmConvert_get_Duration(g_pConvert, &duration);  
   if(FAILED(hr))  
      return hr;  
 
   hr = IltmmConvert_put_SelectionStart(g_pConvert, duration * dStart);  
   if(FAILED(hr))  
      return hr;  
 
   hr = IltmmConvert_put_SelectionEnd(g_pConvert, duration * dEnd);  
   if(FAILED(hr))  
      return hr;  
 
   // setup AVI recompression 
   hr = SetAVIRecompression(NULL);  
   if(FAILED(hr))  
      return hr;  
 
   // do conversion 
   hr = (HRESULT) DialogBox(hInstance, (LPCTSTR)IDD_CONVERTDLG, NULL, ConvertDlgProc);  
 
 
   return hr;  
} 
 
void RecompressingAVIFileSelection_Example ( HINSTANCE hInstance /*application instance handle*/ ) 
{ 
   HRESULT hr ; 
 
   // 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 = RecompressFileSelection(MAKE_MEDIA_PATH("source.avi"), MAKE_MEDIA_PATH("target.avi"), 0.30, 0.60, hInstance);  
   if(FAILED(hr))  
      goto error;  
 
error:  
   // cleanup 
 
   if(g_pConvert)  
      IUnknown_Release(g_pConvert);  
 
   CoUninitialize(); 
} 

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