#include "ltmm.h"
C Syntax |
HRESULT IltmmConvert_get_SourceStreamCount(pConvert, streamType, pVal) |
C++ Syntax |
HRESULT get_SourceStreamCount(streamType, pVal) |
IltmmConvert *pConvert; |
pointer to an interface |
ltmmConvert_Stream streamType; |
the stream type |
long *pVal; |
pointer to a variable |
Gets the number of streams in the current program of the specified streamType.
Parameter |
Description |
pConvert |
Pointer to an IltmmConvert interface. |
streamType |
The type of stream you're interested in. Currently, only two stream types are supported: Video (ltmmConvert_Stream_Video) and Audio (ltmmConvert_Stream_Audio). |
pVal |
Pointer to a variable to be updated with the number of streams of the specified 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. |
See the Programs and Streams topic for more information on programs and streams.
This property returns the number of streams of a particular type in the current program. You can then select which streams you wish to play by calling IltmmConvert::put_SelectedSourceStream.
If you change the current program using IltmmConvert::put_CurrentSourceProgram, the number of streams might change. So you will need to call IltmmConvert::get_SourceStreamCount again.
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. |
Win32, x64
C++ example:
/* This example will select the last video and audio streams. There is no error checking to make the example easier to understand */
void SelectLastProgram(IltmmConvert *pConvert)
{
long SourceStreamCount = 0;
/* Select the last video stream - rarely necessary, since there is usually only one video stream */
pConvert->get_SourceStreamCount(ltmmConvert_Stream_Video, &SourceStreamCount);
if(SourceStreamCount > 1)
pConvert->put_SelectedSourceStream(ltmmConvert_Stream_Video, SourceStreamCount - 1);
/* Select the last audio stream */
pConvert->get_SourceStreamCount(ltmmConvert_Stream_Audio, &SourceStreamCount);
if(SourceStreamCount > 1)
pConvert->put_SelectedSourceStream(ltmmConvert_Stream_Audio, SourceStreamCount - 1);
}
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