IltmmPlay::get_SelectedStream

#include "ltmm.h"

C Syntax

HRESULT IltmmPlay_get_SelectedStream(pPlay, streamType, pVal)

C++ Syntax

HRESULT get_SelectedStream(streamType, pVal)

IltmmPlay *pPlay;

pointer to an interface

ltmmPlay_Stream streamType;

the stream type

long *pVal;

pointer to a variable

Gets the index of the currently selected stream of the specified streamType.

Parameter Description
pPlay Pointer to an IltmmPlay interface.
streamType The type of stream in which you are interested. Currently, only two stream types are supported: Video (ltmmPlay_Stream_Video) and Audio (ltmmPlay_Stream_Audio).
pVal Pointer to a variable to be updated with the index of the specified streamType. The value stored in this variable will be between 0 and StreamCount -1, where StreamCount is the total number of streams of the specified type.

Returns

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.

Comments

Get the number of streams by calling IltmmPlay::get_StreamCount. Change the currently selected stream by calling IltmmPlay::put_SelectedStream.

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 IltmmPlay::put_CurrentProgram, the number of streams can change. So you will need to call IltmmPlay::get_SelectedStream again to see which stream is selected.

Do not confuse this with the Source Stream object returned by IltmmPlay::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.

Required DLLs and Libraries

LTMM

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64

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