Slice header syntax element 'first_mb_in_slice' can point
to the last macroblock, currently the field can only reference
65536 macroblocks which is insufficient for 8K videos.
Although unlikely, a 8192x4320 video (where macroblocks are 16x16),
would contain 138240 macroblocks on a frame.
As per the H264 specification, 'first_mb_in_slice' can be up to
PicSizeInMbs - 1, so increase the size of the field to 32-bits.
Note that v4l2_ctrl_h264_slice_params struct will be modified
in a follow-up commit, and so we defer its 64-bit padding.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Tested-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
* - __u32
- ``header_bit_size``
-
- * - __u16
+ * - __u32
- ``first_mb_in_slice``
-
* - __u8
/* Offset in bits to slice_data() from the beginning of this slice. */
__u32 header_bit_size;
- __u16 first_mb_in_slice;
+ __u32 first_mb_in_slice;
+
__u8 slice_type;
__u8 pic_parameter_set_id;
__u8 colour_plane_id;