Gets the index of the current selected stream of the type streamType.
|C||HRESULT IltmmConvert_get_SelectedSourceStream(pConvert, streamType, pVal)|
|C++||HRESULT get_SelectedSourceStream(streamType, pVal)|
Pointer to an IltmmConvert interface.
Pointer to a variable to be updated with a the index of the current stream of type streamType. The value stored in this variable will be between 0 and SourceStreamCount - 1, where SourceStreamCount is the total number of streams of type streamType.
|S_OK||The function was successful.|
|<> S_OK||An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.|
The streams of a particular type are mutually exclusive. In other words, selecting a stream will automatically unselect the previously selected stream of the same type.
If you change the current program using IltmmConvert::put_CurrentSourceProgram, the number of streams might change. So you will need to call IltmmConvert::get_SelectedSourceStream again to see which stream is selected.
Do not confuse this with the Source Stream object returned by IltmmConvert::get_SourceStream. That refers to an alternative way to provide the source file using an IStream interface instead of a file on disk. Both properties have the word Stream in the name, but there is no connection between the source stream and the audio/video streams present in a file.
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