CBaseFilter.StreamTime method
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The StreamTime method retrieves the current stream time.
Syntax
virtual HRESULT StreamTime(
[ref] CRefTime &rtStream
);
Parameters
-
rtStream [ref]
-
Reference to a CRefTime object that receives the current stream time.
Return value
Returns an HRESULT value. Possible values include those listed in the following table.
| Return code | Description |
|---|---|
|
Success. |
|
No reference clock is available. |
Remarks
Stream time is defined as the current reference time (as given by the reference clock) minus the start time (specified by CBaseFilter::m_tStart). A media sample's time stamp specifies the stream time when it should be rendered. If a sample with a time stamp less than the current stream time has not yet been rendered, it is late.
This method gets the stream time by calling IReferenceClock::GetTime to get the current reference time, and then subtracting the initial start time.
Requirements
| Requirement | Value |
|---|---|
| Header |
|
| Library |
|