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LEADTOOLS Multimedia API Help

Simple Media Player for C

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The following code demonstrates a simple media player application. It utilizes most of the functions available in the ltmmPlay object.

#define MAKE_MEDIA_PATH(pFileName) (TEXT("C:\\LEADTOOLS 18\\Media\\")TEXT(pFileName))


// 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 <math.h>


#define SZ_WNDCLASS_PLAY _T("PLAY WNDCLASS")
#define WM_PLAYNOTIFY (WM_USER + 1000) 

HINSTANCE g_hInstance;    // application instance handle
HWND g_hwndPlay;      // video frame window
IltmmPlay* g_pPlay;      // play object interface pointer
int g_nPositionView;   // current position indicator view mode
enum
{
   POSITIONVIEW_TIME, 
   POSITIONVIEW_FRAME, 
   POSITIONVIEW_TRACKING
};


//
// SnapFrameToVideo
// resizes the frame window to match the video width and height
//
void SnapFrameToVideo(void) 
{
   HWND hwnd; 
   RECT rcWindow, rcClient; 
   long cx, cy; 

   // get the frame window
   IltmmPlay_get_VideoWindowFrame (g_pPlay, (long*) &hwnd); 

   // get the video dimensions
   IltmmPlay_get_VideoWidth (g_pPlay, &cx); 
   IltmmPlay_get_VideoHeight (g_pPlay, &cy); 

   // adjust by the border dimensions
   GetWindowRect(hwnd, &rcWindow); 
   GetClientRect(hwnd, &rcClient); 
   cx += ((rcWindow.right - rcWindow.left) - (rcClient.right - rcClient.left)); 
   cy += ((rcWindow.bottom - rcWindow.top) - (rcClient.bottom - rcClient.top)); 

   // resize the window
   SetWindowPos(hwnd, NULL, 0, 0, cx, cy, SWP_NOMOVE | SWP_NOZORDER); 
}

//
// FreeSource
// resets source and frees associated resources
//
void FreeSource(void) 
{
   long type; 
   VARIANT var; 
   HGLOBAL hglobal; 

   IltmmPlay_get_SourceType (g_pPlay, &type); 
   if(type == ltmmPlay_Source_Array) 
   {
      IltmmPlay_get_SourceArray(g_pPlay, &var); 
      IltmmPlay_ResetSource(g_pPlay); 
      VariantClear(&var); 
   }
   else if(type == ltmmPlay_Source_HGlobal) 
   {
      IltmmPlay_get_SourceHGlobal (g_pPlay, (long*) &hglobal); 
      IltmmPlay_ResetSource(g_pPlay); 
      GlobalFree(hglobal); 
   }
   else
   {
      IltmmPlay_ResetSource(g_pPlay); 
   }

}

//
// SetSourceArray
// preloads a SAFEARRAY with media data and assigns it to the play object
//
void SetSourceArray(void) 

{
   HRESULT hr; 
   HANDLE hfile;   
   DWORD size, cb; 
   void* buffer; 
   VARIANT var; 
   SAFEARRAY* psaSource; 

   // open the source file
   hfile = CreateFile(MAKE_MEDIA_PATH("source.avi"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); 
   if(hfile == INVALID_HANDLE_VALUE) 
      return; 

   // allocate same-sized SAFEARRAY
   size = GetFileSize(hfile, NULL); 

   psaSource = SafeArrayCreateVector(VT_UI1, 0, size); 
   if(!psaSource) 
   {
      CloseHandle(hfile); 
      return; 
   }

   // read entire source into array
   SafeArrayAccessData(psaSource, (void**) &buffer); 
   if(!ReadFile(hfile, buffer, size, &cb, NULL) || cb != size) 
   {
      SafeArrayUnaccessData(psaSource); 
      CloseHandle(hfile); 
      SafeArrayDestroy(psaSource); 
      return; 
   }
   SafeArrayUnaccessData(psaSource); 

   // close file
   CloseHandle(hfile); 

   // assign the source array
   VariantInit(&var); 
   V_VT(&var) = (VT_ARRAY | VT_UI1); 
   V_ARRAY(&var) = psaSource; 

   hr = IltmmPlay_put_SourceArray (g_pPlay, var); 
   if(FAILED(hr)) 
   {
      SafeArrayDestroy(psaSource); 
      return; 
   }
}

//
// SetSourceArray
// preloads global memory with media data and assigns it to the play object
//
void SetSourceHGlobal(void) 
{
   HRESULT hr; 
   HANDLE hfile;   
   DWORD size, cb; 
   void* buffer; 
   HGLOBAL hglobal; 

   // open the source file
   hfile = CreateFile(MAKE_MEDIA_PATH("source.avi"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); 
   if(hfile == INVALID_HANDLE_VALUE) 
      return; 

   // allocate same-sized global memory
   size = GetFileSize(hfile, NULL); 

   hglobal = GlobalAlloc(GMEM_MOVEABLE, size); 
   if(!hglobal) 
   {
      CloseHandle(hfile); 
      return; 
   }

   // read entire source into memory
   buffer = GlobalLock(hglobal); 
   if(!ReadFile(hfile, buffer, size, &cb, NULL) || cb != size) 
   {
      GlobalUnlock(hglobal); 
      CloseHandle(hfile); 
      GlobalFree(hglobal); 
      return; 
   }
   GlobalUnlock(hglobal); 

   // close file
   CloseHandle(hfile); 


   hr = IltmmPlay_put_SourceHGlobal(g_pPlay, (long) hglobal); 
   if(FAILED(hr)) 
   {
      GlobalFree(hglobal); 
      return; 
   }
}

//
// PlayWndProc
// video frame window procedure
//
LRESULT CALLBACK PlayWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 
{
   BSTR bstr; 
   VARIANT_BOOL f; 
   long l; 
   TCHAR sz[2048]; 
   LPTSTR p; 
   double d; 
   HRESULT hr; 
   ltmmSizeMode sm; 
   long x, y, cx, cy; 
   RECT rc; 
   POINT pt; 

   switch (message) 
   {
   case WM_CREATE: 
      g_hwndPlay = hwnd; 
      // window is the video window frame
      IltmmPlay_put_VideoWindowFrame (g_pPlay, (long) hwnd); 

      // want notification messages as well
      IltmmPlay_SetNotifyWindow (g_pPlay, (long) hwnd, WM_PLAYNOTIFY); 

      // make sure we start playing immediately

      IltmmPlay_put_AutoStart (g_pPlay, VARIANT_TRUE); 

      // set preferred renderer
      IltmmPlay_put_PreferredVideoRenderer (g_pPlay, ltmmVideoRenderer_VMR9); 

      // set the source file
      bstr = SysAllocString((OLECHAR*)MAKE_MEDIA_PATH("source.avi"));
      IltmmPlay_put_SourceFile (g_pPlay, bstr); 
      SysFreeString(bstr); 

      SnapFrameToVideo();

      return 0; 
      break; 
   case WM_INITMENUPOPUP: 
      if(GetSubMenu(GetMenu(hwnd), 0) == (HMENU)wParam) 
      {
         // enable menu items based on the play object state
         IltmmPlay_get_State (g_pPlay, &l); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PLAY, (l == ltmmPlay_State_Paused || l == ltmmPlay_State_Stopped) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PAUSE, (l == ltmmPlay_State_Running) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_STOP, (l == ltmmPlay_State_Running || l == ltmmPlay_State_Paused) ? MF_ENABLED : MF_GRAYED); 

         // enable menu items based on seeking capabilities
         IltmmPlay_CheckSeekingCapabilities (g_pPlay, ltmmPlay_Seeking_Forward | ltmmPlay_Seeking_Backward | ltmmPlay_Seeking_FrameForward | ltmmPlay_Seeking_FrameBackward, &l); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKSTART, (l & ltmmPlay_Seeking_Backward) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKEND, (l & ltmmPlay_Seeking_Forward) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_NEXTFRAME, (l & ltmmPlay_Seeking_FrameForward) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PREVIOUSFRAME, (l & ltmmPlay_Seeking_FrameBackward) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKSELECTIONSTART, (l & (ltmmPlay_Seeking_Forward | ltmmPlay_Seeking_Backward)) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKSELECTIONEND, (l & (ltmmPlay_Seeking_Forward | ltmmPlay_Seeking_Backward)) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_LASTFRAME, (l & ltmmPlay_Seeking_FrameForward) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_FIRSTFRAME, (l & ltmmPlay_Seeking_FrameBackward) ? MF_ENABLED : MF_GRAYED); 

         EnableMenuItem((HMENU) wParam, ID_CONTROL_STEPFORWARD1SEC, (l & ltmmPlay_Seeking_Forward) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_STEPFORWARD10, (l & ltmmPlay_Seeking_Forward) ? MF_ENABLED : MF_GRAYED); 

         // check the current speed
         IltmmPlay_get_Rate (g_pPlay, &d); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_HALFSPEED, (fabs(d - 0.5) < 0.1) ? MF_CHECKED : MF_UNCHECKED); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_NORMALSPEED, (fabs(d - 1.0) < 0.1) ? MF_CHECKED : MF_UNCHECKED); 

         // check the current video size mode
         IltmmPlay_get_VideoWindowSizeMode (g_pPlay, &sm); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_FITTOWINDOW, (sm == ltmmFit) ? MF_CHECKED : MF_UNCHECKED); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_STRETCHTOWINDOW, (sm == ltmmStretch) ? MF_CHECKED : MF_UNCHECKED); 

         // enable volume menu items
         IltmmPlay_get_Volume (g_pPlay, &l); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_INCREASEVOLUME, (l < 0) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_DECREASEVOLUME, (l > -10000) ? MF_ENABLED : MF_GRAYED); 

         // enable balance menu items
         IltmmPlay_get_Balance (g_pPlay, &l); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PANRIGHT, (l < 10000) ? MF_ENABLED : MF_GRAYED); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PANLEFT, (l > -10000) ? MF_ENABLED : MF_GRAYED); 


         // check mute
         IltmmPlay_get_Mute (g_pPlay, &f); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_MUTE, f ? MF_CHECKED : MF_UNCHECKED); 

         // check auto rewind
         IltmmPlay_get_AutoRewind (g_pPlay, &f); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_AUTOREWIND, f ? MF_CHECKED : MF_UNCHECKED); 

         // check loop
         IltmmPlay_get_PlayCount (g_pPlay, &l); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_LOOP, (l == 0) ? MF_CHECKED : MF_UNCHECKED); 

         // enable processors
         IltmmPlay_HasDialog(g_pPlay, ltmmPlay_Dlg_VideoProcessors, &f); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PROCESSORS_VIDEO, f ? MF_ENABLED : MF_GRAYED); 
         IltmmPlay_HasDialog(g_pPlay, ltmmPlay_Dlg_AudioProcessors, &f); 
         EnableMenuItem((HMENU) wParam, ID_CONTROL_PROCESSORS_AUDIO, f ? MF_ENABLED : MF_GRAYED); 

         // check source
         IltmmPlay_get_SourceType (g_pPlay, &l); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_SOURCE_FILE, (l == ltmmPlay_Source_File) ? MF_CHECKED : MF_UNCHECKED); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_SOURCE_ARRAY, (l == ltmmPlay_Source_Array) ? MF_CHECKED : MF_UNCHECKED); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_SOURCE_HGLOBAL, (l == ltmmPlay_Source_HGlobal) ? MF_CHECKED : MF_UNCHECKED); 

         IltmmPlay_get_AutoStart (g_pPlay, &f); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_AUTOSTART, f ? MF_CHECKED : MF_UNCHECKED); 

         // check position view
         CheckMenuItem((HMENU) wParam, ID_CONTROL_POSITIONVIEW_FRAME, (g_nPositionView == POSITIONVIEW_FRAME) ? MF_CHECKED : MF_UNCHECKED); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_POSITIONVIEW_TIME, (g_nPositionView == POSITIONVIEW_TIME) ? MF_CHECKED : MF_UNCHECKED); 
         CheckMenuItem((HMENU) wParam, ID_CONTROL_POSITIONVIEW_TRACKING, (g_nPositionView == POSITIONVIEW_TRACKING) ? MF_CHECKED : MF_UNCHECKED); 

      }
      break; 
   case WM_PLAYNOTIFY: 
      switch(wParam) 
      {
      case ltmmPlay_Notify_TrackingSelectionChanged: 
         break; 
      case ltmmPlay_Notify_TrackingPositionChanged: 
         p = sz; 

         *p = _T('\0'); 

         if(g_nPositionView == POSITIONVIEW_TRACKING)   // tracking position based
         {
            // display current tracking position
            hr = IltmmPlay_get_CurrentTrackingPosition (g_pPlay, &l); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Trk. Pos.: %d"), l); 
            }   

            // display current tracking selection start
            hr = IltmmPlay_get_TrackingSelectionStart(g_pPlay, &l); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Trk. Start: %d"), l); 
            }

            // display current tracking selection end
            hr= IltmmPlay_get_TrackingSelectionEnd (g_pPlay, &l); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Trk. End: %d"), l); 
            }
         }
         else if(g_nPositionView == POSITIONVIEW_FRAME)   // frame based
         {
            // display current frame position
            hr = IltmmPlay_get_CurrentFramePosition (g_pPlay, &l); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Frame: %d"), l + 1); 
            }

            // display total number of frames
            hr = IltmmPlay_get_FrameDuration (g_pPlay, &l); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Total Frames: %d"), l); 
            }


         }
         else // time based
         {
            // display the current position
            hr = IltmmPlay_get_CurrentPosition (g_pPlay, &d); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Position: %f"), d); 
            }   

            // display the total duration
            hr = IltmmPlay_get_Duration (g_pPlay, &d); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Duration: %f"), d); 
            }

            // display current selection start
            hr = IltmmPlay_get_SelectionStart (g_pPlay, &d); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("Start: %f"), d); 
            }

            // display current selection end
            hr = IltmmPlay_get_SelectionEnd (g_pPlay, &d); 
            if(SUCCEEDED(hr)) 
            {
               if(p != sz) 
                  p += _stprintf(p, _T(", "));
               p += _stprintf(p, _T("End: %f"), d); 
            }

         }
         SetWindowText(hwnd, sz); 
         break; 
      case ltmmPlay_Notify_StateChanged: 
         switch(LOWORD(lParam)) 
         {
         case ltmmPlay_State_NotReady: 
            _stprintf(sz, _T("Not Ready"));
            SetWindowText(hwnd, sz); 
            break; 
         case ltmmPlay_State_Stopped: 
            // uncomment the following line to view the the graph in DirectShow GraphEdit
            // IltmmPlay_EditGraph(g_pPlay);
            IltmmPlay_get_SourceType (g_pPlay, &l); 
            if(l == ltmmPlay_Source_Array) 
            {
               _stprintf(sz, _T("Stopped - [array]")); 
            }
            else if(l == ltmmPlay_Source_HGlobal) 
            {
               _stprintf(sz, _T("Stopped - [hglobal]")); 
            }
            else
            {
               IltmmPlay_get_SourceFile(g_pPlay, &bstr); 
               _stprintf(sz, _T("Stopped - [%ls]"), bstr); 
               SysFreeString(bstr); 
            }
            SetWindowText(hwnd, sz); 
            break; 
         case ltmmPlay_State_Paused: 
            IltmmPlay_get_SourceType (g_pPlay, &l); 
            if(l == ltmmPlay_Source_Array) 
            {
               _stprintf(sz, _T("Paused - [array]")); 
            }
            else if(l == ltmmPlay_Source_HGlobal) 
            {
               _stprintf(sz, _T("Paused - [hglobal]")); 
            }
            else
            {
               IltmmPlay_get_SourceFile (g_pPlay, &bstr); 
               _stprintf(sz, _T("Paused - [%ls]"), bstr); 
               SysFreeString(bstr); 
            }
            SetWindowText(hwnd, sz); 
            break; 
         case ltmmPlay_State_Running: 
            _stprintf(sz, _T("Playing"));
            SetWindowText(hwnd, sz); 
            break; 
         }
         break; 
      case ltmmPlay_Notify_Error: 
         _stprintf(sz, _T("Error 0x%.8X. Playback stopped."), lParam); 
         MessageBox(hwnd, sz, _T("Play"), MB_ICONEXCLAMATION | MB_OK); 
         break; 
      }
      return 0; 
      break; 
   case WM_KEYDOWN: 
      if(wParam == VK_ESCAPE) 
      {
         // if fullscreen mode then exit it
         IltmmPlay_get_FullScreenMode (g_pPlay, &f); 
         if(f) 
         {
            IltmmPlay_put_FullScreenMode (g_pPlay, VARIANT_FALSE); 
            return 0; 
         }
      }
      break; 
   case WM_DESTROY: 
      FreeSource();
      // no more notifications
      IltmmPlay_SetNotifyWindow (g_pPlay, (long) NULL, 0); 
      PostQuitMessage(0); 
      break; 
   case WM_COMMAND: 
      switch(LOWORD(wParam)) 
      {
      case ID_CONTROL_POSITIONVIEW_TIME: 
         g_nPositionView = POSITIONVIEW_TIME; 
         break; 
      case ID_CONTROL_POSITIONVIEW_FRAME: 
         g_nPositionView = POSITIONVIEW_FRAME; 
         break; 
      case ID_CONTROL_POSITIONVIEW_TRACKING: 
         g_nPositionView = POSITIONVIEW_TRACKING; 
         break; 
      case ID_CONTROL_AUTOSTART: 
         // toggle auto start
         IltmmPlay_get_AutoStart (g_pPlay, &f);   
         IltmmPlay_put_AutoStart (g_pPlay, f ? VARIANT_FALSE : VARIANT_TRUE); 
         return 0; 
         break; 
      case ID_CONTROL_PLAY: 
         // play file
         IltmmPlay_Run (g_pPlay);   
         return 0; 
         break; 
      case ID_CONTROL_PAUSE: 
         // pause playback
         IltmmPlay_Pause (g_pPlay);   
         return 0; 
         break; 
      case ID_CONTROL_STOP: 
         // stop playback
         IltmmPlay_Stop (g_pPlay);   
         return 0; 
         break; 
      case ID_CONTROL_HALFSPEED: 
         // set to half the normal playback speed
         IltmmPlay_put_Rate (g_pPlay, 0.5); 
         return 0; 
         break; 
      case ID_CONTROL_NORMALSPEED: 
         // set to normal speed
         IltmmPlay_put_Rate (g_pPlay, 1.0); 
         return 0; 
         break; 
      case ID_CONTROL_SEEKSTART: 
         // seek to file start
         IltmmPlay_SeekStart(g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_SEEKEND: 
         // seek to file end
         IltmmPlay_SeekEnd (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_SEEKSELECTIONSTART: 
         // seek to the start of the current selection
         IltmmPlay_SeekSelectionStart (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_SEEKSELECTIONEND: 
         // seek to the end of the current selection
         IltmmPlay_SeekSelectionEnd (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_SETSELECTIONSTART: 
         // set the start of the selection to the current position
         IltmmPlay_MarkSelectionStart (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_SETSELECTIONEND: 
         // set the end of the selection to the current position
         IltmmPlay_MarkSelectionEnd (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_CLEARSELECTION: 
         // clear the current selection
         IltmmPlay_get_Duration(g_pPlay, &d);      
         IltmmPlay_put_SelectionStart (g_pPlay, 0.0); 
         IltmmPlay_put_SelectionEnd (g_pPlay, d); 
         return 0; 
         break; 
      case ID_CONTROL_NEXTFRAME: 
         // goto the next frame
         IltmmPlay_NextFrame (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_PREVIOUSFRAME: 
         // goto the previous frame
         IltmmPlay_PreviousFrame (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_FIRSTFRAME: 
         // goto to the first frame
         IltmmPlay_put_CurrentFramePosition (g_pPlay, 0); 
         return 0; 
         break; 
      case ID_CONTROL_LASTFRAME: 
         // goto to the last frame
         IltmmPlay_get_FrameDuration (g_pPlay, &l); 
         IltmmPlay_put_CurrentFramePosition (g_pPlay, l - 1); 
         return 0; 
         break; 
      case ID_CONTROL_STEPFORWARD1SEC: 
         // step forward 1 second
         IltmmPlay_get_CurrentPosition (g_pPlay, &d); 
         IltmmPlay_put_CurrentPosition (g_pPlay, d + 1.0); 
         return 0; 
         break; 
      case ID_CONTROL_STEPFORWARD10: 
         // step forward 10%
         IltmmPlay_get_CurrentTrackingPosition (g_pPlay, &l); 
         IltmmPlay_put_CurrentTrackingPosition(g_pPlay, l + 1000); 
         return 0; 
         break; 
      case ID_CONTROL_FITTOWINDOW: 
         // fit the video to the window
         IltmmPlay_put_VideoWindowSizeMode (g_pPlay, ltmmFit); 
         return 0; 
         break; 
      case ID_CONTROL_STRETCHTOWINDOW: 
         // stretch the video to the window
         IltmmPlay_put_VideoWindowSizeMode (g_pPlay, ltmmStretch); 
         return 0; 
         break; 
      case ID_CONTROL_MUTE: 
         // toggle mute
         IltmmPlay_get_Mute (g_pPlay, &f); 
         IltmmPlay_put_Mute (g_pPlay, f ? VARIANT_FALSE : VARIANT_TRUE); 
         return 0; 
         break; 
      case ID_CONTROL_INCREASEVOLUME: 
         // increase the volume
         IltmmPlay_get_Volume (g_pPlay, &l); 
         IltmmPlay_put_Volume (g_pPlay, min(0, l + 300)); 
         return 0; 
         break; 
      case ID_CONTROL_DECREASEVOLUME: 
         // decrease the volume
         IltmmPlay_get_Volume (g_pPlay, &l); 
         IltmmPlay_put_Volume (g_pPlay, max(-10000, l - 300)); 
         return 0; 
         break; 
      case ID_CONTROL_PANRIGHT: 
         // pan balance to the right
         IltmmPlay_get_Balance (g_pPlay, &l); 
         IltmmPlay_put_Balance(g_pPlay, min(10000, l + 300)); 
         return 0; 
         break; 
      case ID_CONTROL_PANLEFT: 
         // pan balance to the left
         IltmmPlay_get_Balance (g_pPlay, &l); 
         IltmmPlay_put_Balance (g_pPlay, max(-10000, l - 300)); 
         return 0; 
         break; 
      case ID_CONTROL_LOOP: 
         // toggle looping
         IltmmPlay_get_PlayCount(g_pPlay, &l); 
         IltmmPlay_put_PlayCount (g_pPlay, l ? 0 : 1); 
         return 0; 
         break; 
      case ID_CONTROL_FULLSCREEN: 
         // toggle fullscreen mode
         IltmmPlay_ToggleFullScreenMode (g_pPlay); 
         return 0; 
         break; 
      case ID_CONTROL_AUTOREWIND: 
         // toggle auto rewind
         IltmmPlay_get_AutoRewind (g_pPlay, &f); 
         IltmmPlay_put_AutoRewind (g_pPlay, f ? VARIANT_FALSE : VARIANT_TRUE); 
         return 0; 
         break; 
      case ID_CONTROL_PROCESSORS_VIDEO: 
         // invoke video processor dialog box
         IltmmPlay_ShowDialog (g_pPlay, ltmmPlay_Dlg_VideoProcessors, (long) hwnd); 
         return 0; 
         break; 
      case ID_CONTROL_PROCESSORS_AUDIO: 
         // invoke audio processor dialog box
         IltmmPlay_ShowDialog (g_pPlay, ltmmPlay_Dlg_AudioProcessors, (long) hwnd); 
         return 0; 
         break; 
      case ID_CONTROL_SOURCE_FILE: 
         // set the source file
         FreeSource();
         bstr = SysAllocString((OLECHAR*)MAKE_MEDIA_PATH("source.avi"));
         IltmmPlay_put_SourceFile (g_pPlay, bstr); 
         SysFreeString(bstr); 
         SnapFrameToVideo();
         return 0; 
         break; 
      case ID_CONTROL_SOURCE_ARRAY: 
         // set the source array
         FreeSource();
         SetSourceArray();
         SnapFrameToVideo();
         return 0; 
         break; 
      case ID_CONTROL_SOURCE_HGLOBAL: 
         // set the source hglobal
         FreeSource();
         SetSourceHGlobal();
         SnapFrameToVideo();
         return 0; 
         break; 
      case ID_CONTROL_MEDIAINFORMATION: 
         // display available media information         
         p = sz; 

         IltmmPlay_get_Title (g_pPlay, &bstr); 
         p += _stprintf(p, _T("Title = '%ls'"), bstr ? bstr : L"");
         SysFreeString(bstr); 

         IltmmPlay_get_Author (g_pPlay, &bstr); 
         p += _stprintf(p, _T(", Author = '%ls'"), bstr ? bstr : L"");
         SysFreeString(bstr); 

         IltmmPlay_get_Copyright (g_pPlay, &bstr); 
         p += _stprintf(p, _T(", Copyright = '%ls'"), bstr ? bstr : L"");
         SysFreeString(bstr); 

         IltmmPlay_get_Description (g_pPlay, &bstr); 
         p += _stprintf(p, _T(", Description = '%ls'"), bstr ? bstr : L"");
         SysFreeString(bstr); 

         IltmmPlay_get_Rating (g_pPlay, &bstr); 
         p += _stprintf(p, _T(", Rating = '%ls'"), bstr ? bstr : L"");
         SysFreeString(bstr); 

         MessageBox(hwnd, sz, _T("Media Information"), MB_OK); 

         return 0; 
         break; 
      }
      break; 
   case WM_LBUTTONDOWN: 
      // perform play/pause if the user clicks in the video window
      IltmmPlay_get_VideoWindowLeft (g_pPlay, &x); 
      IltmmPlay_get_VideoWindowTop (g_pPlay, &y); 
      IltmmPlay_get_VideoWindowWidth (g_pPlay, &cx); 
      IltmmPlay_get_VideoWindowHeight (g_pPlay, &cy); 
      SetRect(&rc, x, y, x + cx, y + cy); 
      pt.x = (short) LOWORD(lParam); 
      pt.y = (short) HIWORD(lParam); 
      if(PtInRect(&rc, pt)) 
      {
         IltmmPlay_get_State (g_pPlay, &l); 

         if(l == ltmmPlay_State_Stopped || l == ltmmPlay_State_Paused) 
            IltmmPlay_Run (g_pPlay); 
         else if(l == ltmmPlay_State_Running) 
            IltmmPlay_Pause (g_pPlay); 
      }
      return 0; 
      break; 
   }
   return DefWindowProc(hwnd, message, wParam, lParam); 
}


int APIENTRY WinMain(HINSTANCE hInstance, 
                     HINSTANCE hPrevInstance, 
                     LPSTR     lpCmdLine, 
                     int       nCmdShow) 
{
   MSG msg; 
   HRESULT hr; 
   WNDCLASSEX wcex; 


   hPrevInstance = hPrevInstance ;
   lpCmdLine = lpCmdLine ;
   nCmdShow  = nCmdShow ;

   g_hInstance = hInstance; 

   // initialize COM library
   hr = CoInitialize(NULL); 
   if(FAILED(hr)) 
      goto error; 


   // register the video frame window class
   wcex.cbSize = sizeof(WNDCLASSEX); 
   wcex.style = CS_HREDRAW | CS_VREDRAW; 
   wcex.lpfnWndProc = PlayWndProc; 
   wcex.cbClsExtra = 0; 
   wcex.cbWndExtra = 0; 
   wcex.hInstance = g_hInstance; 
   wcex.hIcon = NULL; 
   wcex.hCursor = LoadCursor(NULL, IDC_ARROW); 
   wcex.hbrBackground = (HBRUSH) (COLOR_APPWORKSPACE + 1); 
   wcex.lpszMenuName = (LPCSTR)IDR_MENU; 
   wcex.lpszClassName = SZ_WNDCLASS_PLAY; 
   wcex.hIconSm = NULL; 

   if(!RegisterClassEx(&wcex)) 
      goto error; 


   // create the play object
   hr = CoCreateInstance(&CLSID_ltmmPlay, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmPlay, (void**) &g_pPlay); 
   if(FAILED(hr)) 
      goto error; 

   // create the video frame window
   if(!CreateWindow(SZ_WNDCLASS_PLAY, _T("Play"), WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN, 
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, g_hInstance, NULL)) 
      goto error; 

   ShowWindow(g_hwndPlay, nCmdShow); 

   UpdateWindow(g_hwndPlay); 

   // process until done
   while (GetMessage(&msg, NULL, 0, 0)) 
   {
      TranslateMessage(&msg); 
      DispatchMessage(&msg); 
   }

error: 
   if(g_pPlay) 
      IUnknown_Release(g_pPlay); 

   CoUninitialize();

   return 0;   
}
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