MF_SOURCE_READER_MEDIASOURCE_CHARACTERISTICS attribute

Gets the characteristics of the media source from the Source Reader.

Data type

UINT32

The value is a bitwise OR of flags from the MFMEDIASOURCE_CHARACTERISTICS enumeration.

Remarks

To get this attribute, call the IMFSourceReader::GetPresentationAttribute method on the source reader. Set the dwStreamIndex parameter to MF_SOURCE_READER_MEDIASOURCE and the guidAttribute parameter to MF_SOURCE_READER_MEDIASOURCE_CHARACTERISTICS.

The PROPVARIANT type for this attribute is VT_UI4.

Examples

HRESULT GetSourceFlags(IMFSourceReader *pReader, ULONG *pulFlags)
{
 ULONG flags = 0;

 PROPVARIANT var;
 PropVariantInit(&var);

 HRESULT hr = pReader->GetPresentationAttribute(
 MF_SOURCE_READER_MEDIASOURCE, 
 MF_SOURCE_READER_MEDIASOURCE_CHARACTERISTICS, 
 &var);

 if (SUCCEEDED(hr))
 {
 hr = PropVariantToUInt32(var, &flags);
 }
 if (SUCCEEDED(hr))
 {
 *pulFlags = flags;
 }

 PropVariantClear(&var);
 return hr;
}

Requirements

See also

Alphabetical List of Media Foundation Attributes

Source Reader