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IMediaFilter::Pause method (strmif.h)

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 Pause method pauses the filter.

Syntax

HRESULT Pause();

Return value

Returns an HRESULT value. Possible values include those shown in the following table.

Return code Description
S_FALSE
 Transition is not complete.
S_OK
 Success. Transition is complete.

Remarks

When a filter is paused, it can receive, process, and deliver samples. However, a renderer filter will only accept one sample while paused. Therefore, when the filter graph is paused, samples move through the graph until the first sample reaches the renderer. At that point, streaming is paused until the IMediaFilter::Run method is called. Video renderers display the first sample as a still frame.

Live capture filters do not deliver any samples while paused, only while running.

The state transition might be asynchronous. If the method returns before the transition completes, the return value is S_FALSE. A renderer filter does not complete the transition to paused until either (1) it receives one sample, or (2) it receives an end-of-stream notification. While the state transition is pending, IMediaFilter::GetState returns VFW_S_STATE_INTERMEDIATE.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IBaseFilter

IMediaFilter Interface