v4l2object: prefer NV12 over I420

Considering NV12 an 'odd' format is a historical artifact. This format
is now quite common, and usually preferable to I420 due to more memory
friendly access patterns.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/857>

diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index 594d809..a0a599c 100644 (file)
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -1057,8 +1057,6 @@ gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt)
       rank = GREY_BASE_RANK;
       break;
 
-    case V4L2_PIX_FMT_NV12:    /* 12  Y/CbCr 4:2:0  */
-    case V4L2_PIX_FMT_NV12M:   /* Same as NV12      */
     case V4L2_PIX_FMT_NV12MT:  /* NV12 64x32 tile   */
     case V4L2_PIX_FMT_NV21:    /* 12  Y/CrCb 4:2:0  */
     case V4L2_PIX_FMT_NV21M:   /* Same as NV21      */
@@ -1082,6 +1080,10 @@ gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt)
     case V4L2_PIX_FMT_YUV420M:
       rank = YUV_BASE_RANK + 7;
       break;
+    case V4L2_PIX_FMT_NV12:    /* Y/CbCr 4:2:0, 12 bits per pixel */
+    case V4L2_PIX_FMT_NV12M:   /* Same as NV12      */
+      rank = YUV_BASE_RANK + 8;
+      break;
     case V4L2_PIX_FMT_YUYV:    /* YUY2, 16 bits per pixel */
       rank = YUV_BASE_RANK + 10;
       break;