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| Microsoft DirectShow 9.0 |
IMediaSeeking::SetTimeFormat
The SetTimeFormat method sets the time format for subsequent seek operations.
Syntax
HRESULT SetTimeFormat( const GUID *pFormat );
Parameters
pFormat
[in] Pointer to a GUID that specifies the time format. See Time Format GUIDs.
Return Values
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
| S_OK | Success. |
| E_INVALIDARG | Invalid argument. |
| E_NOTIMPL | Method is not supported. |
| E_POINTER | NULL pointer argument. |
| VFW_E_WRONG_STATE | Filter graph is not stopped. |
Remarks
This method specifies the time units used by other IMediaSeeking methods, such as IMediaSeeking::GetPositions and IMediaSeeking::SetPositions. Whenever you call one of these other methods, any parameters that express time values are given in units of the current time format.
The default time format is REFERENCE_TIME units (100 nanoseconds). Other time formats include frames, samples, and bytes. To determine if a given format is supported, call the IMediaSeeking::IsFormatSupported method. If a format is supported, you can switch to that format by calling SetTimeFormat. Only one time format is active at any one time.
Requirements
Header: Declared in Strmif.h; include Dshow.h.
Library: Use Strmiids.lib.
See Also