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IMediaSeeking::GetPreroll method

The GetPreroll method retrieves the amount of data that will be queued before the start position.

Syntax


HRESULT GetPreroll(
  [out]  LONGLONG *pllPreroll
);

Parameters

pllPreroll [out]

Pointer to a variable that receives the preroll time, in units of the current time format.

Return value

Returns an HRESULT value. Possible values include the following.

Return codeDescription
S_OK

Success.

E_NOTIMPL

Method is not supported.

E_POINTER

NULL pointer argument.

 

Remarks

The preroll is the time prior to the start position at which nonrandom access devices, such as tape players, should start rolling.

The returned value is expressed in the current time format. The default time format is REFERENCE_TIME units (100 nanoseconds). To change time formats, use the IMediaSeeking::SetTimeFormat method.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Strmif.h (include Dshow.h)

Library

Strmiids.lib

See also

Error and Success Codes
IMediaSeeking Interface

 

 

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