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Enumerating MPEG2 Format Compatible Compressors Example for C++

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The following code demonstrates enumerates the valid audio and video compressors for the MPEG2 target format. A recommended compressor is also retrieved.

// include the LEAD Multimedia TOOLKIT header
#include "ltmm.h"

void EnumMPEG2Compressors(IltmmConvert *pConvert)
{
   IltmmCompressors *pCompressors;
   IltmmCompressor *pCompressor;
   IltmmTargetFormats *pTargetformats;
   IltmmTargetFormat* pTargetformat;
   long lCount, lIndex, lValid;
   BSTR Name;

   // set the target format to MPEG2
   pConvert->put_TargetFormat(ltmmCapture_TargetFormat_MPEG2_PROGRAM);

   pConvert->get_TargetFormats(&pTargetformats);
   pTargetformats->Item(ltmmCapture_TargetFormat_MPEG2_PROGRAM, &pTargetformat);
   pTargetformats->Release();

   // Audio 
   // get the compressors collection
   pConvert->get_AudioCompressors(&pCompressors);
   pCompressors->get_Count(&lCount);

   for (lIndex = 0; lIndex < lCount; lIndex++)
   {
      pCompressors->Item(lIndex, &pCompressor);
      pCompressor->get_Name(&Name);
      pTargetformat->IsValidCompressor(Name, &lValid);
      if (lValid != ltmmTargetFormat_Compressor_Invalid)
      {
         // do whatever needed with the valid compressor (i.e. add it to some list)
      }
      ::SysFreeString(Name);
      pCompressor->Release();
   }

   // get the recommended compressor for the current format
   pTargetformat->get_RecommendedAudioCompressor(&Name);
   if (Name)
   {
      // do whatever needed with the recommended compressor (i.e. select it)
   }
   pCompressors->Release();

   // Video 
   // get the compressors collection
   pConvert->get_VideoCompressors(&pCompressors);
   pCompressors->get_Count(&lCount);

   for (lIndex = 0; lIndex < lCount; lIndex++)
   {
      pCompressors->Item(lIndex, &pCompressor);
      pCompressor->get_Name(&Name);
      pTargetformat->IsValidCompressor(Name, &lValid);
      if (lValid != ltmmTargetFormat_Compressor_Invalid)
      {
         // do whatever needed with the valid compressor (i.e. add it to some list)
      }
      ::SysFreeString(Name);
      pCompressor->Release();
   }

   // get the recommended compressor for the current format
   pTargetformat->get_RecommendedVideoCompressor(&Name);
   if (Name)
   {
      // do whatever needed with the recommended compressor (i.e. select it)
   }
   pCompressors->Release();

   pTargetformat->Release();
}
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