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]

1 files changed, 5 insertions, 1 deletions

diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 5e80daa4ffe0..7bf59a87a1bf 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -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;
 };