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video-anc: Implement transform functions for AFD/Bar metas

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If the transformation is just a copy, copy over the metadata. For AFD
also copy over the metadata if the aspect ratio stays the same in
scaling transformations. In all other cases fail the transformation.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/791>
This commit is contained in:
Sebastian Dröge 2020-08-18 10:42:09 +03:00 committed by GStreamer Merge Bot
parent d2a0b38717
commit 5bfb438d3b
1 changed files with 65 additions and 2 deletions
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67
gst-libs/gst/video/video-anc.c
View file

@ -1162,6 +1162,53 @@ gst_video_afd_meta_init (GstMeta * meta, gpointer params, GstBuffer * buffer)
return TRUE;
}
static gboolean
gst_video_afd_meta_transform (GstBuffer * dest, GstMeta * meta,
GstBuffer * buffer, GQuark type, gpointer data)
{
GstVideoAFDMeta *smeta = (GstVideoAFDMeta *) meta;
if (GST_META_TRANSFORM_IS_COPY (type)) {
GST_DEBUG ("copy AFD metadata");
gst_buffer_add_video_afd_meta (dest, smeta->field, smeta->spec, smeta->afd);
return TRUE;
} else if (GST_VIDEO_META_TRANSFORM_IS_SCALE (type)) {
GstVideoMetaTransform *trans = data;
gdouble diff;
gint ow, oh, nw, nh;
gint opn, opd, npn, npd;
ow = GST_VIDEO_INFO_WIDTH (trans->in_info);
nw = GST_VIDEO_INFO_WIDTH (trans->out_info);
oh = GST_VIDEO_INFO_HEIGHT (trans->in_info);
nh = GST_VIDEO_INFO_HEIGHT (trans->out_info);
opn = GST_VIDEO_INFO_PAR_N (trans->in_info);
opd = GST_VIDEO_INFO_PAR_D (trans->in_info);
npn = GST_VIDEO_INFO_PAR_N (trans->out_info);
npd = GST_VIDEO_INFO_PAR_D (trans->out_info);
/* if the aspect ratio stays the same we can copy the meta, otherwise
* we can't know if the aspect ratio was changed or black borders were
* introduced. Both would invalidate the AFD meta */
diff =
ABS (((gdouble) ow / (gdouble) oh) * ((gdouble) opn / (gdouble) opd) -
((gdouble) nw / (gdouble) nh) * ((gdouble) npn / (gdouble) npd));
if (diff < 0.0001) {
GST_DEBUG ("copying AFD metadata, aspect ratio did not change");
gst_buffer_add_video_afd_meta (dest, smeta->field, smeta->spec,
smeta->afd);
return TRUE;
} else {
return FALSE;
}
} else {
/* return FALSE, if transform type is not supported */
return FALSE;
}
}
const GstMetaInfo *
gst_video_afd_meta_get_info (void)
{
@ -1173,7 +1220,7 @@ gst_video_afd_meta_get_info (void)
sizeof (GstVideoAFDMeta),
gst_video_afd_meta_init,
NULL,
NULL);
gst_video_afd_meta_transform);
g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) mi);
}
return meta_info;
@ -1255,6 +1302,22 @@ gst_video_bar_meta_init (GstMeta * meta, gpointer params, GstBuffer * buffer)
return TRUE;
}
static gboolean
gst_video_bar_meta_transform (GstBuffer * dest, GstMeta * meta,
GstBuffer * buffer, GQuark type, gpointer data)
{
GstVideoBarMeta *smeta = (GstVideoBarMeta *) meta;
if (GST_META_TRANSFORM_IS_COPY (type)) {
GST_DEBUG ("copy Bar metadata");
gst_buffer_add_video_bar_meta (dest, smeta->field, smeta->is_letterbox,
smeta->bar_data1, smeta->bar_data2);
return TRUE;
} else {
/* return FALSE, if transform type is not supported */
return FALSE;
}
}
const GstMetaInfo *
gst_video_bar_meta_get_info (void)
@ -1267,7 +1330,7 @@ gst_video_bar_meta_get_info (void)
sizeof (GstVideoBarMeta),
gst_video_bar_meta_init,
NULL,
NULL);
gst_video_bar_meta_transform);
g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) mi);
}
return meta_info;