diff options
| author | Ezequiel Garcia <ezequiel@collabora.com> | 2020-08-25 05:52:36 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-09-01 14:13:28 +0200 |
| commit | d9358563179a7f01f9020ebbe201c7e54ba3af48 (patch) | |
| tree | c9c80894592191fd0008b9917cdf6f33cb2113b9 /include/media/v4l2-h264.h | |
| parent | 2287c5e65cbcc99633c412dbfe1d39bd9f7bf1ce (diff) | |
media: uapi: h264: Clean slice invariants syntax elements
The H.264 specification requires in section 7.4.3 "Slice header semantics",
that the following values shall be the same in all slice headers:
pic_parameter_set_id
frame_num
field_pic_flag
bottom_field_flag
idr_pic_id
pic_order_cnt_lsb
delta_pic_order_cnt_bottom
delta_pic_order_cnt[ 0 ]
delta_pic_order_cnt[ 1 ]
sp_for_switch_flag
slice_group_change_cycle
These bitstream fields are part of the slice header, and therefore
passed redundantly on each slice. The purpose of the redundancy
is to make the codec fault-tolerant in network scenarios.
This is of course not needed to be reflected in the V4L2 controls,
given the bitstream has already been parsed by applications.
Therefore, move the redundant fields to the per-frame decode
parameters control (DECODE_PARAMS).
Field 'pic_parameter_set_id' is simply removed in this case,
because the PPS control must currently contain the active PPS.
Syntax elements dec_ref_pic_marking() and those related
to pic order count, remain invariant as well, and therefore,
the fields dec_ref_pic_marking_bit_size and pic_order_cnt_bit_size
are also common to all slices.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@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 'include/media/v4l2-h264.h')
| -rw-r--r-- | include/media/v4l2-h264.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/media/v4l2-h264.h b/include/media/v4l2-h264.h index 1a5f26fc2a9a..f08ba181263d 100644 --- a/include/media/v4l2-h264.h +++ b/include/media/v4l2-h264.h @@ -44,7 +44,6 @@ struct v4l2_h264_reflist_builder { void v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b, const struct v4l2_ctrl_h264_decode_params *dec_params, - const struct v4l2_ctrl_h264_slice_params *slice_params, const struct v4l2_ctrl_h264_sps *sps, const struct v4l2_h264_dpb_entry dpb[V4L2_H264_NUM_DPB_ENTRIES]); |