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codecs: h264decoder: Don't try to construct RefPicList0 and RefPicList1 if not required

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We were trying to construct reference picture list even for
I slice before this commit. Reference list is required only for
P, SP and B slices. Also, if all existing reference pictures
are gap pictures, we don't need to construct lists.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>
This commit is contained in:
Seungha Yang 2020-11-17 03:11:46 +09:00
parent 1794a44577
commit 11509fded1
1 changed files with 31 additions and 2 deletions
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33
gst-libs/gst/codecs/gsth264decoder.c
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@ -2255,6 +2255,31 @@ construct_ref_pic_lists_b (GstH264Decoder * self)
static void
gst_h264_decoder_prepare_ref_pic_lists (GstH264Decoder * self)
{
GstH264DecoderPrivate *priv = self->priv;
gboolean construct_list = FALSE;
gint i;
GArray *dpb_array = gst_h264_dpb_get_pictures_all (priv->dpb);
/* 8.2.4.2.1 ~ 8.2.4.2.4
* When this process is invoked, there shall be at least one reference entry
* that is currently marked as "used for reference"
* (i.e., as "used for short-term reference" or "used for long-term reference")
* and is not marked as "non-existing"
*/
for (i = 0; i < dpb_array->len; i++) {
GstH264Picture *picture = g_array_index (dpb_array, GstH264Picture *, i);
if (GST_H264_PICTURE_IS_REF (picture) && !picture->nonexisting) {
construct_list = TRUE;
break;
}
}
g_array_unref (dpb_array);
if (!construct_list) {
gst_h264_decoder_clear_ref_pic_lists (self);
return;
}
construct_ref_pic_lists_p (self);
construct_ref_pic_lists_b (self);
}
@ -2474,11 +2499,15 @@ gst_h264_decoder_modify_ref_pic_lists (GstH264Decoder * self)
GstH264DecoderPrivate *priv = self->priv;
GstH264SliceHdr *slice_hdr = &priv->current_slice.header;
/* fill reference picture lists for B and S/SP slices */
g_array_set_size (priv->ref_pic_list0, 0);
g_array_set_size (priv->ref_pic_list1, 0);
if (GST_H264_IS_P_SLICE (slice_hdr) || GST_H264_IS_SP_SLICE (slice_hdr)) {
/* 8.2.4 fill reference picture list RefPicList0 for P or SP slice */
copy_pic_list_into (priv->ref_pic_list0, priv->ref_pic_list_p0);
return modify_ref_pic_list (self, 0);
} else {
} else if (GST_H264_IS_B_SLICE (slice_hdr)) {
/* 8.2.4 fill reference picture list RefPicList0 and RefPicList1 for B slice */
copy_pic_list_into (priv->ref_pic_list0, priv->ref_pic_list_b0);
copy_pic_list_into (priv->ref_pic_list1, priv->ref_pic_list_b1);
return modify_ref_pic_list (self, 0)