CVideoTransformFilter::ShouldSkipFrame

Determines if the filter should start, continue, or stop skipping frames.

Syntax

BOOL ShouldSkipFrame(
    IMediaSample *pIn
);

Parameters

pIn

Pointer to the received sample to be transformed or skipped.

Return Value

Returns TRUE if the filter should skip this sample; otherwise, returns FALSE.

Remarks

This member function sets the m_bSkipping member variable to FALSE if the sample is a key frame (sync point) and returns FALSE. This stops any skipping that has started. This member function starts skipping samples (sets m_bSkipping to TRUE and returns TRUE) only if all the following conditions are true.

• The average time to decode is more than one-fourth of the frame time.
• The filter is running at least one frame late.
• The next anticipated key frame is estimated to be no more than one frame early.
• The occurrence of key frames is sufficiently frequent.

This member function sends an EC_QUALITY_CHANGE notification when sample skipping starts. After skipping starts, all samples are skipped until the next key frame arrives.

See Also

• CVideoTransformFilter Class