#include "ltmm.h"

C Syntax

HRESULT IltmmPlay_IsRateSupported(pPlay, Rate, pResult)

C++ Syntax

HRESULT IsRateSupported(Rate, pResult)

IltmmPlay *pPlay;

pointer to an interface

double Rate;

playback rate


pointer to a variable

Determines whether a specific playback rate is supported or not.

Parameter Description
pPlay Pointer to an IltmmPlay interface.
Rate The playback rate for which to check.
pResult Pointer to a variable to be updated with a value that indicates whether the specified playback rate is supported. Possible values are:
  Value Description
  TRUE The rate is supported.
  FALSE The rate is not supported.



The function was successful.

<> S_OK

An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.


The playback rate is expressed as a ratio of the normal playback speed. For example, use 1.0 for normal speed, 2.0 for double speed, and 0.5 for half speed.

Required DLLs and Libraries


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

See Also




Multimedia Function Group


For a C example, refer to the IltmmPlay::IsRateSupported Example for C.

For a C++ example, refer to the IltmmPlay::IsRateSupported Example for C++.

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