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media: uapi: h264: clarify num_ref_idx_l[01]_(default_)active fields

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Since the uapi does not contain the num_ref_idx_active_override_flag,
drivers for decoders that do not parse slices themselves don't know
how to choose between the num_ref_idx_l[01]_default_active and the
num_ref_idx_l[01]_active override fields.

Instead, userspace must set the override fields to the default values
if the slice does not have the num_ref_idx_active_override flag set.
The drivers will then always enable the override internally and ignore
the default fields completely.

Clarify this requirement in the API documentation.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Philipp Zabel 2019-09-10 07:22:39 -03:00 committed by Mauro Carvalho Chehab
parent 8255b4d219
commit 187ef7c5c7
1 changed files with 4 additions and 2 deletions
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6
Documentation/media/uapi/v4l/ext-ctrls-codec.rst
View file

@ -1820,10 +1820,12 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
-
* - __u8
- ``num_ref_idx_l0_active_minus1``
-
- If num_ref_idx_active_override_flag is not set, this field must be
set to the value of num_ref_idx_l0_default_active_minus1.
* - __u8
- ``num_ref_idx_l1_active_minus1``
-
- If num_ref_idx_active_override_flag is not set, this field must be
set to the value of num_ref_idx_l1_default_active_minus1.
* - __u32
- ``slice_group_change_cycle``
-