[totem/wip/hadess/track-lists] backend: Add bacon_video_toggle_subtitles()

[Bastien Nocera <hadess src gnome org>]

commit ded6fade1362c1c41f66df3f0176d6c334810de2
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Feb 11 18:23:07 2022 +0100

    backend: Add bacon_video_toggle_subtitles()

 src/backend/bacon-video-widget.c | 23 +++++++++++++++++++++++
 src/backend/bacon-video-widget.h |  1 +
 2 files changed, 24 insertions(+)
---
diff --git a/src/backend/bacon-video-widget.c b/src/backend/bacon-video-widget.c
index 4fc4d41f0..3d9e6ad29 100644
--- a/src/backend/bacon-video-widget.c
+++ b/src/backend/bacon-video-widget.c
@@ -2671,6 +2671,29 @@ bacon_video_widget_set_subtitle (BaconVideoWidget * bvw, int subtitle)
   }
 }
 
+/**
+ * bacon_video_toggle_subtitles:
+ * @bvw: a #BaconVideoWidget
+ *
+ * Toggles the visibility of subtitles.
+ **/
+void
+bacon_video_toggle_subtitles (BaconVideoWidget *bvw)
+{
+  guint flags;
+
+  g_return_if_fail (BACON_IS_VIDEO_WIDGET (bvw));
+  g_return_if_fail (bvw->play != NULL);
+
+  g_object_get (bvw->play, "flags", &flags, NULL);
+  if (flags & GST_PLAY_FLAG_TEXT)
+    flags &= ~GST_PLAY_FLAG_TEXT;
+  else
+    flags |= GST_PLAY_FLAG_TEXT;
+  g_object_set (bvw->play, "flags", flags, NULL);
+  g_signal_emit (bvw, bvw_signals[SIGNAL_SUBTITLES_CHANGED], 0);
+}
+
 static BvwLangInfo *
 find_next_info_for_id (GList *list,
                       int    current)
diff --git a/src/backend/bacon-video-widget.h b/src/backend/bacon-video-widget.h
index 0e6c77b22..3964c6118 100644
--- a/src/backend/bacon-video-widget.h
+++ b/src/backend/bacon-video-widget.h
@@ -385,6 +385,7 @@ int bacon_video_widget_get_subtitle              (BaconVideoWidget *bvw);
 void bacon_video_widget_set_subtitle             (BaconVideoWidget *bvw,
                                                  int subtitle);
 void bacon_video_widget_set_next_subtitle        (BaconVideoWidget *bvw);
+void bacon_video_toggle_subtitles                (BaconVideoWidget *bvw);
 
 gboolean bacon_video_widget_has_next_track      (BaconVideoWidget *bvw);
 gboolean bacon_video_widget_has_previous_track  (BaconVideoWidget *bvw);