media: videodev2.h: Add more field helper macros

Adds two helper macros:

V4L2_FIELD_IS_SEQUENTIAL: returns true if the given field type is
'sequential', that is a full frame is transmitted, or exists in
memory, as all top field lines followed by all bottom field lines,
or vice-versa.

V4L2_FIELD_IS_INTERLACED: returns true if the given field type is
'interlaced', that is a full frame is transmitted, or exists in
memory, as top field lines interlaced with bottom field lines.
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

include/uapi/linux/videodev2.h

@@ -130,6 +130,13 @@ enum v4l2_field {
 	((field) == V4L2_FIELD_BOTTOM ||\
 	 (field) == V4L2_FIELD_TOP ||\
 	 (field) == V4L2_FIELD_ALTERNATE)
+#define V4L2_FIELD_IS_INTERLACED(field) \
+	((field) == V4L2_FIELD_INTERLACED ||\
+	 (field) == V4L2_FIELD_INTERLACED_TB ||\
+	 (field) == V4L2_FIELD_INTERLACED_BT)
+#define V4L2_FIELD_IS_SEQUENTIAL(field) \
+	((field) == V4L2_FIELD_SEQ_TB ||\
+	 (field) == V4L2_FIELD_SEQ_BT)
 
 enum v4l2_buf_type {
 	V4L2_BUF_TYPE_VIDEO_CAPTURE        = 1,