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media: uapi: Add a control for HANTRO driver 

The HEVC HANTRO driver needs to know the number of bits to skip at
the beginning of the slice header.
That is a hardware specific requirement so create a dedicated control
for this purpose.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Benjamin Gaignard 2021-06-03 13:50:01 +02:00 committed by Mauro Carvalho Chehab
parent 31ad15e688
commit 35f51f6091
3 changed files with 33 additions and 0 deletions
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19
Documentation/userspace-api/media/drivers/hantro.rst Normal file
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@ -0,0 +1,19 @@
.. SPDX-License-Identifier: GPL-2.0
Hantro video decoder driver
===========================
The Hantro video decoder driver implements the following driver-specific controls:
``V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP (integer)``
Specifies to Hantro HEVC video decoder driver the number of data (in bits) to
skip in the slice segment header.
If non-IDR, the bits to be skipped go from syntax element "pic_output_flag"
to before syntax element "slice_temporal_mvp_enabled_flag".
If IDR, the skipped bits are just "pic_output_flag"
(separate_colour_plane_flag is not supported).
.. note::
This control is not yet part of the public kernel API and
it is expected to change.

1
Documentation/userspace-api/media/drivers/index.rst
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@ -33,6 +33,7 @@ For more details see the file COPYING in the source distribution of Linux.
ccs
cx2341x-uapi
hantro
imx-uapi
max2175
meye-uapi

13
include/media/hevc-ctrls.h
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@ -224,4 +224,17 @@ struct v4l2_ctrl_hevc_decode_params {
__u64 flags;
};
/* MPEG-class control IDs specific to the Hantro driver as defined by V4L2 */
#define V4L2_CID_CODEC_HANTRO_BASE (V4L2_CTRL_CLASS_CODEC | 0x1200)
/*
* V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP -
* the number of data (in bits) to skip in the
* slice segment header.
* If non-IDR, the bits to be skipped go from syntax element "pic_output_flag"
* to before syntax element "slice_temporal_mvp_enabled_flag".
* If IDR, the skipped bits are just "pic_output_flag"
* (separate_colour_plane_flag is not supported).
*/
#define V4L2_CID_HANTRO_HEVC_SLICE_HEADER_SKIP (V4L2_CID_CODEC_HANTRO_BASE + 0)
#endif