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IMediaFilter::Run

  • Article

Informs the filter to transition to the new (running) state. Passes a time value to synchronize independent streams.

HRESULT Run(
REFERENCE_TIME tStart);

Parameters

  • tStart
    Time value of the reference clock.

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.

E_FAIL Failure.
E_POINTER Null pointer argument.
E_INVALIDARG Invalid argument.
E_NOTIMPL Method isn't supported.
S_OK or NOERROR Success.

Remarks

The tStart parameter is the amount to be added to the IMediaSample time stamp to determine the time at which that sample should be rendered according to the reference clock. That is, it is the reference time at which a sample with a stream time of zero should be rendered.

For example, the time value for the beginning of the stream is the time at which the first sample should appear. If the application restarts from paused mode in midstream, tStart is the amount of time paused, plus the start time.

The filter graph provides this information to its filters. An application calling the filter graph may pass a start time of zero, in which case the filter graph calculates a time that will begin as soon as possible. Filter graphs accept zero to mean as soon as possible; most filters do not.

 Last updated on Tuesday, July 13, 2004

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