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authorEzequiel Garcia <ezequiel@collabora.com>2020-08-25 05:52:31 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-09-01 14:13:28 +0200
commit4245232fa6ca58f79710732bd16cefe78b8b8bc4 (patch)
tree0615ed0be12512d287872a8dfc94a374d2a8cf52 /Documentation/userspace-api
parentfb92c56312d4e3a5c30de963e459a040a4761665 (diff)
media: uapi: h264: Increase size of 'first_mb_in_slice' field
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>
Diffstat (limited to 'Documentation/userspace-api')
-rw-r--r--Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 591d3d35c429..a417a1ae50d5 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