Copying ltmmMediaSample Attributes and Data for C++

The following code demonstrates how to copy a media sample's attributes and data to another media sample.

// include the LEAD Multimedia TOOLKIT header 
#include "ltmm.h" 
 
///////////////////////////////////////////////////////////////// 
//CopyMediaSampleAttributes 
// copies data and attributes from one sample to another 
// pDest - destination sample interface 
// pSource - source sample interface 
HRESULT CopyMediaSampleAttributes(IltmmMediaSampleDisp* pDest, IltmmMediaSampleDisp* pSource) 
{ 
   HRESULT hr; 
   VARIANT_BOOL f; 
   LARGE_INTEGER starttime; 
   LARGE_INTEGER stoptime; 
   VARIANT var; 
   long cbData; 
   long cbBuffer; 
   IltmmMediaTypeDisp* pMediaType; 
 
   // return error if NULL 
   if(!pSource || !pDest) 
      return E_POINTER; 
 
   // get the source actual data length 
   hr = pSource->get_ActualDataLength(&cbData); 
   if(FAILED(hr)) 
      return hr; 
 
   // now the dest maximum buffer size 
   hr = pDest->get_BufferSize(&cbBuffer); 
   if(FAILED(hr)) 
      return hr; 
 
   // if no room for the data, return an error 
   if(cbData > cbBuffer) 
      return E_OUTOFMEMORY; 
 
   // any data to copy? 
   if(cbData) 
   { 
      // yes, then copy away 
      hr = pSource->GetData(cbData, &var); 
      if(FAILED(hr)) 
         return hr; 
      hr = pDest->SetData(cbData, var); 
      VariantClear(&var); 
      if(FAILED(hr)) 
         return hr; 
   } 
   else 
   { 
      // no, just set the dest data length to 0 
      pDest->put_ActualDataLength(0); 
   } 
 
   // copy the media type, if there is one 
   pMediaType = NULL; 
   pSource->GetMediaType(&pMediaType); 
   if(pMediaType) 
   { 
      pDest->SetMediaType(pMediaType); 
      pMediaType->Release(); 
   } 
 
   // copy discontinuity 
   f = VARIANT_FALSE; 
   pSource->get_Discontinuity(&f); 
   pDest->put_Discontinuity(f); 
 
   // copy preroll 
   f = VARIANT_FALSE; 
   pSource->get_Preroll(&f); 
   pDest->put_Preroll(f); 
 
   // copy syncpoint 
   f = VARIANT_FALSE; 
   pSource->get_SyncPoint(&f); 
   pDest->put_SyncPoint(f); 
 
   // is the time available? 
   hr = pSource->GetTime(&starttime.HighPart, (long*) &starttime.LowPart, &stoptime.HighPart, (long*) &stoptime.LowPart); 
   if(FAILED(hr)) 
   { 
      // no, then reset the dest time 
      pDest->ResetTime(); 
   } 
   else 
   { 
      // yes, copy to the dest 
      pDest->SetTime(starttime.HighPart, starttime.LowPart, stoptime.HighPart, stoptime.LowPart); 
   } 
 
   // is the media time available? 
   hr = pSource->GetMediaTime(&starttime.HighPart, (long*) &starttime.LowPart, &stoptime.HighPart, (long*) &stoptime.LowPart); 
   if(FAILED(hr)) 
   { 
      // no, then reset the dest media time 
      pDest->ResetMediaTime(); 
   } 
   else 
   { 
      // yes, copy to the dest 
      pDest->SetMediaTime(starttime.HighPart, starttime.LowPart, stoptime.HighPart, stoptime.LowPart); 
   } 
   return S_OK; 
} 

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