[Bug 787160] New: Backport patch for 4K colorimetry BT2020_12 selection needs >= 2160 in height check

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787160

            Bug ID: 787160
           Summary: Backport patch for 4K colorimetry BT2020_12 selection
                    needs >= 2160 in height check
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ian.arkver.dev at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

[PATCH] v4l2: Fix 4K colorimetry
+
+Since 1.6, the transfer function for BT2020 has been changed from BT709
+to BT2020_12. It's the same function, but with more precision. As a side
+effect, the V4L2 colorpsace didn't match GStreamer colorspace. When
+GStreamer ended up making a guess, it would not match anything supported
+by V4L2 anymore. This this by using BT2020_12 for BT2020 colorspace and
+BT2020 transfer function in replacement of BT709 whenever a 4K
+resolution is detected.

+@@ -2062,7 +2062,10 @@ gst_v4l2_object_get_colorspace (struct v4l2_format
*fmt,
+ 
+   switch (transfer) {
+     case V4L2_XFER_FUNC_709:
+-      cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
++      if (fmt->fmt.pix.height > 2160)
++        cinfo->transfer = GST_VIDEO_TRANSFER_BT2020_12;
++      else
++        cinfo->transfer = GST_VIDEO_TRANSFER_BT709;
+       break;

This height comparison should be >= 2160.

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