From: Nicolas Dufresne Date: Fri, 13 May 2022 20:29:08 +0000 (+0200) Subject: media: h264: Sort p/b reflist using frame_num X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6cafdc8cc0da0ddffad25ca9c70bab990ab9130f;p=linux.git media: h264: Sort p/b reflist using frame_num 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 Reviewed-by: Sebastian Fricke Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c index 853f54e0fe67c..fe215035d9e82 100644 --- a/drivers/media/v4l2-core/v4l2-h264.c +++ b/drivers/media/v4l2-core/v4l2-h264.c @@ -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); diff --git a/include/media/v4l2-h264.h b/include/media/v4l2-h264.h index 4cef717b3f18a..0d9eaa9561237 100644 --- a/include/media/v4l2-h264.h +++ b/include/media/v4l2-h264.h @@ -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];