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media: uapi: HEVC: Add num_delta_pocs_of_ref_rps_idx field 

Some drivers firmwares parse by themselves slice header and need
num_delta_pocs_of_ref_rps_idx value to parse slice header
short_term_ref_pic_set().
Use one of the 4 reserved bytes to store this value without
changing the v4l2_ctrl_hevc_decode_params structure size and padding.

This value also exist in DXVA API.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: fix typo in num_delta_pocs_of_ref_rps_idx doc]
This commit is contained in:
Benjamin Gaignard 2023-05-24 16:07:38 +08:00 committed by Hans Verkuil
parent aaeb31c00e
commit ae440c5da3
2 changed files with 12 additions and 1 deletions
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7
Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst
View File

@ -2923,6 +2923,13 @@ This structure contains all loop filter related parameters. See sections
- ``poc_lt_curr[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- PocLtCurr as described in section 8.3.2 "Decoding process for reference
picture set": provides the index of the long term references in DPB array.
* - __u8
- ``num_delta_pocs_of_ref_rps_idx``
- When the short_term_ref_pic_set_sps_flag in the slice header is equal to 0,
it is the same as the derived value NumDeltaPocs[RefRpsIdx]. It can be used to parse
the RPS data in slice headers instead of skipping it with @short_term_ref_pic_set_size.
When the value of short_term_ref_pic_set_sps_flag in the slice header is
equal to 1, num_delta_pocs_of_ref_rps_idx shall be set to 0.
* - struct :c:type:`v4l2_hevc_dpb_entry`
- ``dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
- The decoded picture buffer, for meta-data about reference frames.

6
include/uapi/linux/v4l2-controls.h
View File

@ -2385,6 +2385,9 @@ struct v4l2_ctrl_hevc_slice_params {
* @poc_st_curr_after: provides the index of the short term after references
* in DPB array
* @poc_lt_curr: provides the index of the long term references in DPB array
* @num_delta_pocs_of_ref_rps_idx: same as the derived value NumDeltaPocs[RefRpsIdx],
* can be used to parse the RPS data in slice headers
* instead of skipping it with @short_term_ref_pic_set_size.
* @reserved: padding field. Should be zeroed by applications.
* @dpb: the decoded picture buffer, for meta-data about reference frames
* @flags: see V4L2_HEVC_DECODE_PARAM_FLAG_{}
@ -2400,7 +2403,8 @@ struct v4l2_ctrl_hevc_decode_params {
__u8 poc_st_curr_before[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 poc_st_curr_after[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 poc_lt_curr[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u8 reserved[4];
__u8 num_delta_pocs_of_ref_rps_idx;
__u8 reserved[3];
struct v4l2_hevc_dpb_entry dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
__u64 flags;
};