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media: h264: Sort p/b reflist using frame_num

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In the reference list builder, frame_num refers to FrameNumWrap
in the spec, which is the same as the pic_num for frame decoding.
The same applies for long_term_pic_num and long_term_frame_idx.

Sort all type of references by frame_num so the sort can be reused
for fields reflist were the sorting is done using frame_num instead.
In short, pic_num is never actually used for building reference
lists.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Nicolas Dufresne 2022-05-13 22:29:08 +02:00 committed by Mauro Carvalho Chehab
parent d3f756ad62
commit 6cafdc8cc0
2 changed files with 13 additions and 12 deletions
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23
drivers/media/v4l2-core/v4l2-h264.c
View File

@ -56,7 +56,6 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
if (!(dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE))
continue;
b->refs[i].pic_num = dpb[i].pic_num;
if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM)
b->refs[i].longterm = true;
@ -145,15 +144,19 @@ static int v4l2_h264_p_ref_list_cmp(const void *ptra, const void *ptrb,
}
/*
* Short term pics in descending pic num order, long term ones in
* ascending order.
* For frames, short term pics are in descending pic num order and long
* term ones in ascending order. For fields, the same direction is used
* but with frame_num (wrapped). For frames, the value of pic_num and
* frame_num are the same (see formula (8-28) and (8-29)). For this
* reason we can use frame_num only and share this function between
* frames and fields reflist.
*/
if (!builder->refs[idxa].longterm)
return builder->refs[idxb].frame_num <
builder->refs[idxa].frame_num ?
-1 : 1;
return builder->refs[idxa].pic_num < builder->refs[idxb].pic_num ?
return builder->refs[idxa].frame_num < builder->refs[idxb].frame_num ?
-1 : 1;
}
@ -179,10 +182,10 @@ static int v4l2_h264_b0_ref_list_cmp(const void *ptra, const void *ptrb,
return 1;
}
/* Long term pics in ascending pic num order. */
/* Long term pics in ascending frame num order. */
if (builder->refs[idxa].longterm)
return builder->refs[idxa].pic_num <
builder->refs[idxb].pic_num ?
return builder->refs[idxa].frame_num <
builder->refs[idxb].frame_num ?
-1 : 1;
poca = v4l2_h264_get_poc(builder, ptra);
@ -224,10 +227,10 @@ static int v4l2_h264_b1_ref_list_cmp(const void *ptra, const void *ptrb,
return 1;
}
/* Long term pics in ascending pic num order. */
/* Long term pics in ascending frame num order. */
if (builder->refs[idxa].longterm)
return builder->refs[idxa].pic_num <
builder->refs[idxb].pic_num ?
return builder->refs[idxa].frame_num <
builder->refs[idxb].frame_num ?
-1 : 1;
poca = v4l2_h264_get_poc(builder, ptra);

2
include/media/v4l2-h264.h
View File

@ -18,7 +18,6 @@
* @refs.top_field_order_cnt: top field order count
* @refs.bottom_field_order_cnt: bottom field order count
* @refs.frame_num: reference frame number
* @refs.pic_num: reference picture number
* @refs.longterm: set to true for a long term reference
* @refs: array of references
* @cur_pic_order_count: picture order count of the frame being decoded
@ -36,7 +35,6 @@ struct v4l2_h264_reflist_builder {
s32 top_field_order_cnt;
s32 bottom_field_order_cnt;
int frame_num;
u32 pic_num;
u16 longterm : 1;
} refs[V4L2_H264_NUM_DPB_ENTRIES];