CTransformFilter.AlterQuality 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 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 |
|---|---|
|
Did not handle the quality message. The message should be passed upstream. |
|
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 |
|
| Library |
|
See also
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