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video-overlay-composition: Handle the SCALE meta transformation

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Simply update the render rectangle according to the scale factor. As only the
render rectangle is changed, the seqnum of the rectangle stays intact and no
additional GPU uploads are necessary.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8288>
This commit is contained in:
Sebastian Dröge 2025-01-12 12:44:29 +02:00 committed by GStreamer Marge Bot
parent 8991140c5a
commit 55fa0a54a2
1 changed files with 57 additions and 10 deletions
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67
subprojects/gst-plugins-base/gst-libs/gst/video/video-overlay-composition.c
View file

@ -212,20 +212,67 @@ gst_video_overlay_composition_meta_transform (GstBuffer * dest, GstMeta * meta,
smeta = (GstVideoOverlayCompositionMeta *) meta;
if (GST_META_TRANSFORM_IS_COPY (type)) {
GstMetaTransformCopy *copy = data;
GST_DEBUG ("copy video overlay composition metadata");
if (!copy->region) {
GST_DEBUG ("copy video overlay composition metadata");
dmeta =
(GstVideoOverlayCompositionMeta *) gst_buffer_add_meta (dest,
GST_VIDEO_OVERLAY_COMPOSITION_META_INFO, NULL);
if (!dmeta)
return FALSE;
/* only copy if the complete data is copied as well */
dmeta =
(GstVideoOverlayCompositionMeta *) gst_buffer_add_meta (dest,
GST_VIDEO_OVERLAY_COMPOSITION_META_INFO, NULL);
if (!dmeta)
return FALSE;
dmeta->overlay = gst_video_overlay_composition_ref (smeta->overlay);
} else if (GST_VIDEO_META_TRANSFORM_IS_SCALE (type)) {
GstVideoMetaTransform *trans = data;
GstVideoOverlayComposition *new_comp;
gint ow, oh, nw, nh;
guint n_rectangles;
dmeta->overlay = gst_video_overlay_composition_ref (smeta->overlay);
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);
GST_DEBUG ("scaling video overlay composition metadata %dx%d -> %dx%d", ow,
oh, nw, nh);
smeta = (GstVideoOverlayCompositionMeta *) meta;
new_comp = gst_video_overlay_composition_new (NULL);
n_rectangles = gst_video_overlay_composition_n_rectangles (smeta->overlay);
for (guint i = 0; i < n_rectangles; i++) {
GstVideoOverlayRectangle *rect =
gst_video_overlay_composition_get_rectangle (smeta->overlay, i);
GstVideoOverlayRectangle *new_rect =
gst_video_overlay_rectangle_copy (rect);
gint render_x = 0, render_y = 0;
gint new_render_x, new_render_y;
guint render_width = 0, render_height = 0;
guint new_render_width, new_render_height;
gst_video_overlay_rectangle_get_render_rectangle (rect, &render_x,
&render_y, &render_width, &render_height);
new_render_x = (render_x * nw) / ow;
new_render_y = (render_y * nw) / ow;
new_render_width = (render_width * nw) / ow;
new_render_height = (render_height * nw) / ow;
GST_DEBUG
("overlay rectangle %u (seqnum: %d) (%dx%d)x(%ux%u) -> (%dx%d)->(%ux%u)",
i, gst_video_overlay_rectangle_get_seqnum (rect), render_x, render_y,
render_width, render_height, new_render_x, new_render_y,
new_render_width, new_render_height);
gst_video_overlay_rectangle_set_render_rectangle (new_rect,
new_render_x, new_render_y, new_render_width, new_render_height);
gst_video_overlay_composition_add_rectangle (new_comp, new_rect);
gst_video_overlay_rectangle_unref (new_rect);
}
dmeta = gst_buffer_add_video_overlay_composition_meta (dest, new_comp);
gst_video_overlay_composition_unref (new_comp);
if (!dmeta)
return FALSE;
} else {
/* return FALSE, if transform type is not supported */
return FALSE;