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| author | Ezequiel Garcia <ezequiel@collabora.com> | 2020-08-25 05:52:31 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-09-01 14:13:28 +0200 |
| commit | 4245232fa6ca58f79710732bd16cefe78b8b8bc4 (patch) | |
| tree | 0615ed0be12512d287872a8dfc94a374d2a8cf52 /Documentation | |
| parent | fb92c56312d4e3a5c30de963e459a040a4761665 (diff) | |
| download | linux-4245232fa6ca58f79710732bd16cefe78b8b8bc4.tar.bz2 | |
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')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 |
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 |