IltmfConvert::GetPreferredMediaSourceHandler

Summary

Retrieves the preferred media source handler's GUID set using IltmfConvert::SetPreferredMediaSourceHandler.

Syntax

#include "ltmf.h"

Parameters

IltmfConvert *pConvert

Pointer to an IltmfConvert interface.

long MediaSourceHandlerType

Value that indicates the media source handler type. For a list of possible values, refer to ltmfConvert_PreferredMediaSourceHandler Constants.

BSTR *pVal

Pointer to a string to be updated with the media source handler's GUID. For a list of possible values, refer to ltmfMediaSourceHandler Constants.

Returns

Comments

This function can be used to determine whether a preferred media source handler has been set by IltmfConvert::SetPreferredMediaSourceHandler. It will return NULL (if no preferred filter has been set) or a GUID indicating the preferred media source handler.

This GUID uniquely identifies the media source handler. Every media format has a registered media source handler(s) who are responsible of creating a media source for this media type.

For example, the GUID for the LEAD MPEG2 Transport Media Source Handler is:

EFE626C3-0A2C-49FA-8A01-3768B559B6DA

If the function succeeds, the caller must free the returned string by calling the SysFreeString function.

A list of display names for common LEAD filters can be found in ltmfMediaSourceHandler Constants.

Please see IltmfConvert::SetPreferredMediaSourceHandler for more information on media source handler GUID.

Required DLLs and Libraries

• LTMF
• 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.

See Also

Functions

• IltmfConvert::SetPreferredMediaSourceHandler

Topics

• Media Foundation Function Groups
• ltmfMediaSourceHandler Constants
• ltmfConvert_PreferredMediaSourceHandler Constants

Example

For a C++ example, refer to .IltmfConvert::SetPreferredMediaSourceHandler Example for C++