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When the bDXVA_Func variable is equal to 4, the operation specified is picture resampling. This operation is used for purposes such as spatial scalable video coding, reference picture resampling, or resampling for use as an upsampled or display picture.
Picture resampling is performed as specified in H.263 Annex O Spatial Scalability or in H.263 Annex P with clipping at the picture edges, which is the same method of picture resampling as in some forms of Spatial Scalability in MPEG-2 and MPEG-4. This function uses simple two-tap separable filtering.
Note that picture resampling control does not require a connection configuration. Its operation requires only support of the appropriate restricted mode GUID. Because no connection configuration is needed for picture resampling control, no minimal interoperability set must be defined for its operation.
A single buffer type defined in the DXVA_PicResample structure controls the resampling process.