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msdkdec: Add support of SFC for AVC and HEVC

Mengkejiergeli Ba requested to merge mkba/gstreamer:sfc into main

SFC refers to https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-kbl-vol15-sfc.pdf.
Decoder SFC (supported for AVC and HEVC), will be triggered when the default output format is not accepted by downstream or when downstream asking for a different resolution (only down-scaling supported).
One use case like (given a 4k bitstream):
"! msdkh265dec ! "video/x-raw,format=BGRA,width=1920,height=1080" ! glimagesink", can work without using msdkvpp.

Edited by Mengkejiergeli Ba

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