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h264decoder: Fix DPB bumping process

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As per spec C.4.5.3 "Bumping", if bumping is needed but DPB holds
no "output needed" picture, then a picture that has the smallest
POC should be considered first for output

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4219>
This commit is contained in:
Seungha Yang 2023-03-17 23:28:58 +09:00 committed by Tim-Philipp Müller
parent 611fc00833
commit 3cc37d91df
1 changed files with 20 additions and 6 deletions
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26
subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth264picture.c
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@ -659,7 +659,7 @@ gst_h264_dpb_has_empty_frame_buffer (GstH264Dpb * dpb)
}
static gint
gst_h264_dpb_get_lowest_output_needed_picture (GstH264Dpb * dpb,
gst_h264_dpb_get_lowest_output_needed_picture (GstH264Dpb * dpb, gboolean force,
GstH264Picture ** picture)
{
gint i;
@ -672,7 +672,7 @@ gst_h264_dpb_get_lowest_output_needed_picture (GstH264Dpb * dpb,
GstH264Picture *picture =
g_array_index (dpb->pic_list, GstH264Picture *, i);
if (!picture->needed_for_output)
if (!force && !picture->needed_for_output)
continue;
if (!GST_H264_PICTURE_IS_FRAME (picture) &&
@ -721,7 +721,8 @@ gst_h264_dpb_needs_bump (GstH264Dpb * dpb, GstH264Picture * to_insert,
lowest_poc = G_MAXINT32;
is_ref_picture = FALSE;
lowest_index = gst_h264_dpb_get_lowest_output_needed_picture (dpb, &picture);
lowest_index = gst_h264_dpb_get_lowest_output_needed_picture (dpb,
FALSE, &picture);
if (lowest_index >= 0) {
lowest_poc = picture->pic_order_cnt;
is_ref_picture = picture->ref_pic;
@ -887,23 +888,36 @@ gst_h264_dpb_bump (GstH264Dpb * dpb, gboolean drain)
GstH264Picture *other_picture;
gint i;
gint index;
gboolean output_needed = TRUE;
g_return_val_if_fail (dpb != NULL, NULL);
index = gst_h264_dpb_get_lowest_output_needed_picture (dpb, &picture);
index = gst_h264_dpb_get_lowest_output_needed_picture (dpb, FALSE, &picture);
/* Bumping is needed but has no output needed pictures. Pick the smallest
* POC picture */
if (!picture && !drain) {
index = gst_h264_dpb_get_lowest_output_needed_picture (dpb, TRUE, &picture);
if (picture)
output_needed = FALSE;
}
if (!picture || index < 0)
return NULL;
picture->needed_for_output = FALSE;
dpb->num_output_needed--;
if (output_needed)
dpb->num_output_needed--;
g_assert (dpb->num_output_needed >= 0);
/* NOTE: don't use g_array_remove_index_fast here since the last picture
* need to be referenced for bumping decision */
if (!GST_H264_PICTURE_IS_REF (picture) || drain)
if (!GST_H264_PICTURE_IS_REF (picture) || drain ||
/* Or in case of emergency bumping, remove this picture from dpb as well */
!output_needed) {
g_array_remove_index (dpb->pic_list, index);
}
other_picture = picture->other_field;
if (other_picture) {