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@xxxxxxxxxxxxx>
---
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 +-
include/media/h264-ctrls.h | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 32f3cebf16e5..714a8d9ae6a0 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -1774,7 +1774,7 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
* - __u32
- ``header_bit_size``
-
- * - __u16
+ * - __u32
- ``first_mb_in_slice``
-
* - __u8
diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
index d995614be159..9ff085fdc9ab 100644
--- a/include/media/h264-ctrls.h
+++ b/include/media/h264-ctrls.h
@@ -174,7 +174,8 @@ struct v4l2_ctrl_h264_slice_params {
/* 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;
--
2.27.0
