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vaapipostproc: WA: RGB to/from YUV CSC color primaries

U. Artie Eoff requested to merge ullysses.a.eoff/gstreamer-vaapi:color-primary-quirk into master

The intel-media-driver (iHD) can't convert output color primaries for various resolutions when doing YUV to/from RGB CSC. Thus, we must keep the output color primaries the same as the input color primaries for these cases.

Fixes #238 (closed)

Tested with:

GST_GL_PLATFORM=egl gst-launch-1.0 -vf filesrc \
 location=~/Videos/test_3840x2160_30mbps_60fps_Baseline@L5.2.mp4 \
 ! qtdemux ! h264parse ! vaapih264dec  ! vaapipostproc ! glimagesink

GST_GL_PLATFORM=egl gst-launch-1.0 -vf videotestsrc \
 ! video/x-raw,width=3840,height=2160,format=NV12 \
 ! vaapipostproc ! glimagesink

gst-launch-1.0 -vf filesrc location=~/Videos/test_3840x2160_30mbps_60fps_Baseline@L5.2.mp4 \
 ! qtdemux ! h264parse ! vaapih264dec \
 ! video/x-raw"(memory:VASurface)",format=BGRA \
 ! vaapipostproc ! "video/x-raw(memory:VASurface)",format=NV12 \
 ! vaapisink

gst-launch-1.0 -vf videotestsrc \
 ! video/x-raw,width=3840,height=2160,format=BGRA \
 ! vaapipostproc ! "video/x-raw(memory:VASurface)",format=NV12 \
 ! vaapisink

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