The following code enumerates the valid audio and video compressors for the MKV target format.
// include the LEAD Media Foundation TOOLKIT header
#include "ltmf.h"
void EnumMKVCompressors(IltmfConvert *pConvert, HWND hwndParent)
{
IltmfCompressors *pCompressors;
IltmfCompressor *pCompressor;
IltmfTargetFormats *pTargetformats;
IltmfTargetFormat* pTargetformat;
long lCount, lIndex, lValid;
BSTR Name;
VARIANT_BOOL vbIsLeadTargetFormat;
// set the target format to MKV
pConvert->put_TargetFormat(ltmfConvert_TargetFormat_MKV);
pConvert->get_TargetFormats(&pTargetformats);
pTargetformats->Item(ltmfConvert_TargetFormat_MKV, &pTargetformat);
pTargetformats->Release();
// state whether this is a LEAD target format
pTargetformat->LeadTargetFormat(&vbIsLeadTargetFormat);
// LEAD target format, enum compressors through AudioCompressors and VideoCompressors interfaces.
if ( vbIsLeadTargetFormat )
{
// 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 != ltmfTargetFormat_Compressor_Invalid)
{
// do whatever needed with the valid compressor (i.e. add it to some list)
}
::SysFreeString(Name);
pCompressor->Release();
}
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 != ltmfTargetFormat_Compressor_Invalid)
{
// do whatever needed with the valid compressor (i.e. add it to some list)
}
::SysFreeString(Name);
pCompressor->Release();
}
pCompressors->Release();
}
else
{
// not LEAD target format, use target format profile dialog.
VARIANT_BOOL vbDialog;
pTargetformat->HasDialog(ltmfTargetFormat_Dlg_Profile, &vbDialog);
if (vbDialog)
{
pTargetformat->ShowDialog(ltmfTargetFormat_Dlg_Profile, (long)hwndParent);
}
}
pTargetformat->Release();
}
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