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vah265enc: Expand log2_max_pic_order_cnt if needed

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In b_pyramid mode, B frames can be ref and prevPicOrderCntLsb can
be the B frame POC which is smaller than the P frame. This can cause
POC diff bigger than MaxPicOrderCntLsb/2 and generate wrong POC value.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6249>
This commit is contained in:
He Junyan 2024-01-28 23:27:48 +08:00 committed by GStreamer Marge Bot
parent 7e8873c100
commit 196de61035
1 changed files with 8 additions and 0 deletions
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8
subprojects/gst-plugins-bad/sys/va/gstvah265enc.c
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@ -3960,6 +3960,14 @@ _h265_generate_gop_structure (GstVaH265Enc * self)
create_poc:
/* init max_frame_num, max_poc */
log2_max_frame_num = _get_log2_max_num (self->gop.idr_period);
/* b_pyramid makes B frames as ref and prevPicOrderCntLsb can
be the B frame POC which is smaller than the P frame. This
can cause POC diff bigger than MaxPicOrderCntLsb/2 and
generate wrong POC value. */
if (self->gop.b_pyramid &&
3 * (self->gop.ip_period >> 1) > 1 << (log2_max_frame_num - 1))
log2_max_frame_num++;
self->gop.log2_max_pic_order_cnt = log2_max_frame_num;
self->gop.max_pic_order_cnt = 1 << self->gop.log2_max_pic_order_cnt;
self->gop.num_reorder_frames = self->gop.b_pyramid ?