tagdemux: Add support for group-id in the stream-start event

diff --git a/gst-libs/gst/tag/gsttagdemux.c b/gst-libs/gst/tag/gsttagdemux.c
index 5fec0b2..b5d92d8 100644 (file)
--- a/gst-libs/gst/tag/gsttagdemux.c
+++ b/gst-libs/gst/tag/gsttagdemux.c
@@ -346,6 +346,9 @@ gst_tag_demux_set_src_caps (GstTagDemux * tagdemux, GstCaps * new_caps)
   GstCaps *old_caps = tagdemux->priv->src_caps;
 
   if (old_caps == NULL || !gst_caps_is_equal (new_caps, old_caps)) {
+    GstEvent *event;
+    guint group_id;
+    gboolean have_group_id;
     gchar *stream_id = gst_pad_create_stream_id (tagdemux->priv->srcpad,
         GST_ELEMENT_CAST (tagdemux), NULL);
 
@@ -354,8 +357,25 @@ gst_tag_demux_set_src_caps (GstTagDemux * tagdemux, GstCaps * new_caps)
     GST_DEBUG_OBJECT (tagdemux, "Changing src pad caps to %" GST_PTR_FORMAT,
         tagdemux->priv->src_caps);
 
-    gst_pad_push_event (tagdemux->priv->srcpad,
-        gst_event_new_stream_start (stream_id));
+    event =
+        gst_pad_get_sticky_event (tagdemux->priv->sinkpad,
+        GST_EVENT_STREAM_START, 0);
+    if (event) {
+      if (gst_event_parse_group_id (event, &group_id))
+        have_group_id = TRUE;
+      else
+        have_group_id = FALSE;
+      gst_event_unref (event);
+    } else {
+      have_group_id = TRUE;
+      group_id = gst_util_group_id_next ();
+    }
+
+    event = gst_event_new_stream_start (stream_id);
+    if (have_group_id)
+      gst_event_set_group_id (event, group_id);
+
+    gst_pad_push_event (tagdemux->priv->srcpad, event);
     g_free (stream_id);
     gst_pad_set_caps (tagdemux->priv->srcpad, tagdemux->priv->src_caps);
   } else {