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CTransformFilter.AlterQuality method

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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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 AlterQuality method notifies the filter that a quality change is requested.

Syntax

virtual HRESULT AlterQuality(
   Quality q
);

Parameters

q

Quality structure that contains the quality control message.

Return value

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

Return code Description
S_FALSE
 Did not handle the quality message. The message should be passed upstream.
S_OK
 Handled the quality message. No further action is necessary.

Remarks

Override this method if the filter can perform quality control. For more information, see Quality-Control Management.

Requirements

Requirement Value
Header
Transfrm.h (include Streams.h)
Library
Strmbase.lib (retail builds);
Strmbasd.lib (debug builds)

See also

CTransformFilter Class