ccextractor: Push a GAP event if we have a caption pad but a video buffer did not...

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1371>

diff --git a/ext/closedcaption/gstccextractor.c b/ext/closedcaption/gstccextractor.c
index 451fbe0..aed91b1 100644 (file)
--- a/ext/closedcaption/gstccextractor.c
+++ b/ext/closedcaption/gstccextractor.c
@@ -423,6 +423,7 @@ gst_cc_extractor_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
   GstFlowReturn flow = GST_FLOW_OK;
   GstVideoCaptionMeta *cc_meta;
   GstVideoTimeCodeMeta *tc_meta;
+  gboolean had_cc_meta = FALSE;
   gpointer iter = NULL;
 
   tc_meta = gst_buffer_get_video_time_code_meta (buf);
@@ -430,6 +431,7 @@ gst_cc_extractor_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
   while ((cc_meta =
           (GstVideoCaptionMeta *) gst_buffer_iterate_meta_filtered (buf, &iter,
               GST_VIDEO_CAPTION_META_API_TYPE)) && flow == GST_FLOW_OK) {
+    had_cc_meta = TRUE;
     flow = gst_cc_extractor_handle_meta (filter, buf, cc_meta, tc_meta);
   }
 
@@ -444,6 +446,11 @@ gst_cc_extractor_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
     gst_buffer_foreach_meta (buf, remove_caption_meta, NULL);
   }
 
+  if (!had_cc_meta && filter->captionpad && GST_BUFFER_PTS_IS_VALID (buf)) {
+    gst_pad_push_event (filter->captionpad,
+        gst_event_new_gap (GST_BUFFER_PTS (buf), GST_BUFFER_DURATION (buf)));
+  }
+
   /* Push the buffer downstream and return the combined flow return */
   return gst_flow_combiner_update_pad_flow (filter->combiner, filter->srcpad,
       gst_pad_push (filter->srcpad, buf));