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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