IMediaSeeking::GetPreroll method (strmif.h)

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

Syntax

HRESULT GetPreroll(
  LONGLONG *pllPreroll
);

Parameters

pllPreroll

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 code Description
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]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IMediaSeeking Interface