Retrieving Media File Information for C

This example will retrieve the source file properties and show them in message boxes.

#include <windows.h> 
#include <tchar.h> 
#include <stdio.h> 
#include "ltmm.h" 
#include "prsht.h" 
 
#if defined(_UNICODE) 
LPOLESTR T2OLE(LPCTSTR lpt) 
{ 
   return (LPOLESTR) lpt; 
} 
LPTSTR OLE2T(LPCOLESTR lpw) 
{ 
   return (LPTSTR) lpw; 
} 
#else 
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; 
} 
 
LPTSTR OLE2T(LPCOLESTR lpw) 
{ 
   static TCHAR lpt[512]; 
   if(!lpw) 
      return NULL; 
   lpt[0] = _T('\0'); 
   WideCharToMultiByte(CP_ACP, 0, lpw, -1, lpt, 512, NULL, NULL); 
   return lpt; 
} 
#endif 
 
void AddStringToMsg(char *pszTitle, BSTR sString, char *pszMsg); 
void AddNumberToMsg(char *pszTitle, double dNumber, char *pszMsg, BOOL bFloat); 
 
int RetrievingMediaFileInformation_Example ( ) 
{ 
   IltmmMediaInfo *pMediaInfo; 
   BSTR sString; 
   char szMsg[8196]; 
   long lStreams, lIndex, l; 
   double d; 
   HRESULT hr; 
 
   CoInitialize(NULL); 
 
   /* create an ltmmMediaInfo object: */ 
   hr = CoCreateInstance(&CLSID_ltmmMediaInfo, NULL, 
      CLSCTX_INPROC_SERVER, &IID_IltmmMediaInfo, 
      (void**) &pMediaInfo); 
 
   memset(szMsg, 0, 8196); 
 
   /* set the source file: */ 
   sString = SysAllocString((OLECHAR*)MAKE_MEDIA_PATH("Test.avi")); 
   IltmmMediaInfo_put_SourceFile(pMediaInfo, sString); 
   SysFreeString(sString); 
 
   /* general properties: */ 
   IltmmMediaInfo_get_SourceFile(pMediaInfo, &sString); 
   AddStringToMsg("Source file: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_SourceFileSize(pMediaInfo, &d); 
   AddNumberToMsg("File size: ", d, szMsg, FALSE); 
 
   IltmmMediaInfo_get_OutputStreams(pMediaInfo, &lStreams); 
   AddNumberToMsg("Number of streams: ", (double)lStreams, szMsg, FALSE); 
 
   IltmmMediaInfo_get_SourceDuration(pMediaInfo, &d); 
   AddNumberToMsg("File duration: ", d, szMsg, TRUE); 
 
   IltmmMediaInfo_get_SourceBitRate(pMediaInfo, &l); 
   AddNumberToMsg("Source BitRate : ", (double)l, szMsg, FALSE); 
 
   IltmmMediaInfo_get_SourceFormat(pMediaInfo, &l); 
   AddNumberToMsg("Source format: ", (double)l, szMsg, FALSE); 
 
   IltmmMediaInfo_get_SourceFormatName(pMediaInfo, &sString); 
   AddStringToMsg("Source format name: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_SourceFilterClassID(pMediaInfo, &sString); 
   AddStringToMsg("Source filter CLSID: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_SourceFilterName(pMediaInfo, &sString); 
   AddStringToMsg("Source filter name: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_Title(pMediaInfo, &sString); 
   AddStringToMsg("Title: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_Author(pMediaInfo, &sString); 
   AddStringToMsg("Author: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_Description(pMediaInfo, &sString); 
   AddStringToMsg("Description: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_Rating(pMediaInfo, &sString); 
   AddStringToMsg("Rating: ", sString, szMsg); 
   SysFreeString(sString); 
 
   IltmmMediaInfo_get_Copyright(pMediaInfo, &sString); 
   AddStringToMsg("Copyright: ", sString, szMsg); 
   SysFreeString(sString); 
 
   MessageBox(0, szMsg, "MediaInfo Sample: General...", 0); 
 
   /* stream properties: */ 
   for( lIndex=0; lIndex<lStreams; lIndex++ ) 
   { 
      memset(szMsg, 0, 8196); 
 
      IltmmMediaInfo_put_CurrentStream(pMediaInfo, lIndex); 
 
      IltmmMediaInfo_get_CurrentStream(pMediaInfo, &l); 
      AddNumberToMsg("Stream number: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_StreamType(pMediaInfo, &sString); 
      AddStringToMsg("Stream type: ", sString, szMsg); 
      SysFreeString(sString); 
 
      IltmmMediaInfo_get_StreamTypeName(pMediaInfo, &sString); 
      AddStringToMsg("Stream type name: ", sString, szMsg); 
      SysFreeString(sString); 
 
      IltmmMediaInfo_get_StreamSubtype(pMediaInfo, &sString); 
      AddStringToMsg("Stream subtype: ", sString, szMsg); 
      SysFreeString(sString); 
 
      IltmmMediaInfo_get_StreamSubtypeName(pMediaInfo, &sString); 
      AddStringToMsg("Stream subtype name: ", sString, szMsg); 
      SysFreeString(sString); 
 
      IltmmMediaInfo_get_StreamDuration(pMediaInfo, &d); 
      AddNumberToMsg("Stream duration: ", d, szMsg, TRUE); 
 
      /* video specific */ 
      strcat(szMsg, "\n"); 
      strcat(szMsg, "\t*** Video specific properties ***\n"); 
 
      IltmmMediaInfo_get_VideoFrameRate(pMediaInfo, &d); 
      AddNumberToMsg("Video frame rate: ", d, szMsg, TRUE); 
 
      IltmmMediaInfo_get_VideoWidth(pMediaInfo, &l); 
      AddNumberToMsg("Video width: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_VideoHeight(pMediaInfo, &l); 
      AddNumberToMsg("Video height: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_VideoBitCount(pMediaInfo, &l); 
      AddNumberToMsg("Video bit count: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_VideoCompression(pMediaInfo, &l); 
      AddNumberToMsg("Video compression: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_VideoBitRate(pMediaInfo, &l); 
      AddNumberToMsg("Video bit rate: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_VideoFrames(pMediaInfo, &l); 
      AddNumberToMsg("Video frames count: ", (double)l, szMsg, FALSE); 
 
      /* Audio specific */ 
      strcat(szMsg, "\n"); 
      strcat(szMsg, "\t*** Audio specific properties ***\n"); 
 
      IltmmMediaInfo_get_AudioFormatTag(pMediaInfo, &l); 
      AddNumberToMsg("Audio format tag: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_AudioChannels(pMediaInfo, &l); 
      AddNumberToMsg("Audio channels: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_AudioSamplesPerSec(pMediaInfo, &l); 
      AddNumberToMsg("Audio frequency: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_AudioBitsPerSample(pMediaInfo, &l); 
      AddNumberToMsg("Audio sample size: ", (double)l, szMsg, FALSE); 
 
      IltmmMediaInfo_get_AudioAvgBytesPerSec(pMediaInfo, &l); 
      AddNumberToMsg("Audio average bytes per second: ", (double)l, szMsg, FALSE); 
 
      MessageBox(0, szMsg, "MediaInfo Sample: Streams...", 0); 
   } 
 
   IltmmMediaInfo_ResetSource(pMediaInfo); 
   IltmmMediaInfo_Release(pMediaInfo); 
 
   return 0; 
} 
 
void AddStringToMsg(char *pszTitle, BSTR sString, char *pszMsg) 
{ 
   strcat(pszMsg, pszTitle); 
   if( sString ) 
      strcat(pszMsg, OLE2T(sString)); 
   else 
      strcat(pszMsg, "NA"); 
   strcat(pszMsg, " \n"); 
} 
 
void AddNumberToMsg(char *pszTitle, double dNumber, char *pszMsg, BOOL bFloat) 
{ 
   char szNumber[64]; 
 
   if( bFloat ) 
      sprintf(szNumber, "%f", dNumber); 
   else 
      sprintf(szNumber, "%.f", dNumber); 
 
   strcat(pszMsg, pszTitle); 
   strcat(pszMsg, szNumber); 
   strcat(pszMsg, " \n"); 
} 

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