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plugin: Fix scaled subtitles position on anamorph video

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GStreamer does not take pixel aspect ratio into account for overlay rectangles.
If we do so, we end up with subtitles that are displayed off-center.
Behave like any other GStreamer sink on this matter.
This commit is contained in:
Rafał Dzięgiel
2022-05-27 19:38:02 +02:00
parent 87b3fbc15a
commit 5289b2f0a4
3 changed files with 17 additions and 12 deletions
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21
lib/gst/plugin/gstclapperimporter.c vendored
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@@ -380,7 +380,7 @@ gst_clapper_importer_handle_context_query (GstClapperImporter *self,
void
gst_clapper_importer_snapshot (GstClapperImporter *self, GdkSnapshot *snapshot,
gdouble width, gdouble height, gfloat scale_x, gfloat scale_y)
gdouble width, gdouble height)
{
guint i;
gboolean buffer_changed;
@@ -424,12 +424,21 @@ gst_clapper_importer_snapshot (GstClapperImporter *self, GdkSnapshot *snapshot,
if (G_LIKELY (self->texture)) {
gtk_snapshot_append_texture (snapshot, self->texture, &GRAPHENE_RECT_INIT (0, 0, width, height));
for (i = 0; i < self->overlays->len; i++) {
GstClapperGdkOverlay *overlay = g_ptr_array_index (self->overlays, i);
if (self->overlays->len > 0) {
gfloat scale_x, scale_y;
gtk_snapshot_append_texture (snapshot, overlay->texture,
&GRAPHENE_RECT_INIT (overlay->x * scale_x, overlay->y * scale_y,
overlay->width * scale_x, overlay->height * scale_y));
/* FIXME: GStreamer scales subtitles without considering pixel aspect ratio.
* See: https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/20 */
scale_x = (gfloat) width / GST_VIDEO_INFO_WIDTH (&self->v_info);
scale_y = (gfloat) height / GST_VIDEO_INFO_HEIGHT (&self->v_info);
for (i = 0; i < self->overlays->len; i++) {
GstClapperGdkOverlay *overlay = g_ptr_array_index (self->overlays, i);
gtk_snapshot_append_texture (snapshot, overlay->texture,
&GRAPHENE_RECT_INIT (overlay->x * scale_x, overlay->y * scale_y,
overlay->width * scale_x, overlay->height * scale_y));
}
}
} else {
GST_ERROR_OBJECT (self, "Failed import of %" GST_PTR_FORMAT, self->buffer);