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Draft: v4l2object: add support for Apple's full-range bt709 colorimetry variant 1:3:5:1

F. Duncanh requested to merge (removed):colorimetry1351 into main

Support for Apple's variant full-range bt709 colorimetry 1:3:5:1

This variant colorimetry is used by Apple AirPlay Mirror streams. Support needed for successful v4l2 caps negotiation.
When colorspace == V4L2_COLORSPACE_REC709 and type == multiplanar, gst_v4l2_object_get_colorspace is called a second time, with fmt.fmt.pix_mp.quantization = V4L2_QUANTIZATION_FULL_RANGE, instead of default value 0.

Fixes #1339 (closed)

Edited by F. Duncanh

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