|Microsoft DirectX 9.0|
The AlterQuality method notifies the filter that a quality change is requested. This method overrides the CTransformFilter::AlterQuality method.
virtual HRESULT AlterQuality( Quality q );
Quality structure that contains the quality control message.
This method is called when the output pin receives a quality message (through the IQualityControl::Notify method).
The lateness value from q is stored in the m_itrLate member variable. The return value of E_FAIL indicates that the renderer should catch up by dropping frames, although the CVideoTransformFilter class will also drop frames under the right conditions.