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CDynamicOutputPin::ChangeOutputFormat

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Microsoft DirectShow 9.0

CDynamicOutputPin::ChangeOutputFormat

The ChangeOutputFormat method dynamically changes the media type for the connection, and delivers new segment information. The change can occur while the filter graph is running. Once this method is called, samples with the old media type cannot be delivered. The caller must ensure that no old samples are pending.

Syntax

  HRESULT ChangeOutputFormat(
    const AM_MEDIA_TYPE *pmt,
    REFERENCE_TIME tSegmentStart,
    REFERENCE_TIME tSegmentStop,
    double dSegmentRate
);

Parameters

pmt

Pointer to an AM_MEDIA_TYPE structure that specifies the media type.

tSegmentStart

Start time of the segment.

tSegmentStop

Stop time of the segment.

dSegmentRate

Segment rate.

Return Value

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

Value Description
S_OK Success.
E_FAIL Failure. Possibly the owning filter did not call CDynamicOutputPin::SetConfigInfo.
VFW_E_NOT_CONNECTED The pin is not connected.

Remarks

This method changes the format type while the filter is running. If the downstream pin accepts the new format, no reconnection is necessary. Otherwise, the method attempts to reconnect the pin. If the method successfully changes the format, it delivers the new segment information. This method calls the CDynamicOutputPin::ChangeMediaType method to perform the format change.

You must call the CDynamicOutputPin::StartUsingOutputPin method before calling this method.

Requirements

**  Header:** Declared in Amfilter.h; include Streams.h.

**  Library:** Use Strmbase.lib (retail builds) or Strmbasd.lib (debug builds).

See Also