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vah265enc: Set backward_num to 1 in low delay mode

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In low delay B mode, the P frame is converted as B frame with forward
references. For example, One P frame may refers to P-1, P-2 and P-3 in
list0 and refers to P-3, P-2 and P-1 in list1.
So the num in list0 and list1 does not reflect the forward_num and
backward_num. The vaapi does not provide ref num for forward or backward
so far. In this case, we just consider the backward_num to be 1 conservatively.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6249>
This commit is contained in:
He Junyan 2024-03-01 00:08:03 +08:00 committed by GStreamer Marge Bot
parent b9c28920e0
commit 1a78d61b9f
1 changed files with 16 additions and 0 deletions
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16
subprojects/gst-plugins-bad/sys/va/gstvah265enc.c
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@ -3805,6 +3805,22 @@ _h265_generate_gop_structure (GstVaH265Enc * self)
}
GST_INFO_OBJECT (self, "Enable low-delay-b mode");
self->gop.low_delay_b_mode = TRUE;
/* FIXME: In low delay B mode, the P frame is converted as B frame
with forward references. For example, One P frame may refers to
P-1, P-2 and P-3 in list0 and refers to P-3, P-2 and P-1 in list1.
So the num in list0 and list1 does not reflect the forward_num
and backward_num. The vaapi does not provide ref num for forward
or backward so far. In this case, we just consider the backward_num
to be 1 conservatively. */
if (list0 == list1) {
backward_num =
(prediction_direction & VA_PREDICTION_DIRECTION_FUTURE) ? 1 : 0;
forward_num = list0 - backward_num;
GST_INFO_OBJECT (self, "Set forward_num to %d, backward_num to %d in "
"low-delay-b mode.", forward_num, backward_num);
}
}
}