IMediaPosition::get_PrerollTime
| Microsoft DirectShow 9.0 |
IMediaPosition::get_PrerollTime
The get_PrerollTime method retrieves the amount of data that will be queued before the start position.
Syntax
HRESULT get_PrerollTime( REFTIME *pllTime );
Parameters
pllTime
[out] Pointer to a variable that receives the preroll time, in seconds.
Return Values
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
| S_OK | Success. |
| E_NOTIMPL | Not implemented. |
| 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.
If no filter in the graph implements this method, the Filter Graph Manager sets the value of *pllTime to zero and returns S_OK.
Requirements
Header: Declared in Control.h; include Dshow.h.
Library: Use Strmiids.lib.
See Also