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This method sets the preroll property. If TRUE, this sample is for preroll only and should not be displayed.
HRESULT SetPreroll(BOOLbIsPreroll);
Parameters
- bIsPreroll
[in] Set to TRUE to specify the media sample as a preroll sample; otherwise, set to FALSE.
Return Values
Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants, or other values not listed.
| Value | Description |
|---|---|
| E_FAIL | Failure. |
| E_POINTER | Null pointer argument. |
| E_INVALIDARG | Invalid argument. |
| E_NOTIMPL | Method is not supported. |
| S_OK or NOERROR | Success. |
Remarks
Preroll samples are samples that are processed but not displayed, and are located in the media stream before the displayable samples.
While calling SetPreroll with a value of TRUE (1) sets the preroll property, calling IsPreroll on a preroll sample returns S_OK (0).
Requirements
DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.
Pocket: Windows Mobile 5.0 and later
Smartphones: Windows Mobile 5.0 and later
OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
See Also
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