decodebin: Always add a multiqueue in single-stream use-buffering pipelines

If we are configured to use buffering and there is no demuxer in the chain, we
still want a multiqueue, otherwise we will ignore the use-buffering property.
In that case, we will insert a multiqueue after the parser or decoder - not
elsewhere, otherwise we won't have timestamps.

https://bugzilla.gnome.org/show_bug.cgi?id=764948

1 files changed, 18 insertions, 0 deletions

diff --git a/gst/playback/gstdecodebin2.c b/gst/playback/gstdecodebin2.c
index fc35ac65d..ed67426c6 100644
--- a/gst/playback/gstdecodebin2.c
+++ b/gst/playback/gstdecodebin2.c
@@ -2133,6 +2133,7 @@ connect_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad,
     GList *to_connect = NULL;
     GList *to_expose = NULL;
     gboolean is_parser = FALSE;
+    gboolean is_decoder = FALSE;
 
     /* Set dpad target to pad again, it might've been unset
      * below but we came back here because something failed
@@ -2394,6 +2395,23 @@ connect_pad (GstDecodeBin * dbin, GstElement * src, GstDecodePad * dpad,
         chain->demuxer = TRUE;
     }
 
+    /* If we are configured to use buffering and there is no demuxer in the
+     * chain, we still want a multiqueue, otherwise we will ignore the
+     * use-buffering property. In that case, we will insert a multiqueue after
+     * the parser or decoder - not elsewhere, otherwise we won't have
+     * timestamps.
+     */
+    is_decoder = strstr (gst_element_factory_get_metadata (factory,
+            GST_ELEMENT_METADATA_KLASS), "Decoder") != NULL;
+
+    if (!chain->parent && (is_parser || is_decoder) && dbin->use_buffering) {
+      chain->demuxer = TRUE;
+      if (is_decoder) {
+        GST_WARNING_OBJECT (dbin,
+            "Buffering messages used for decoded and non-parsed data");
+      }
+    }
+
     CHAIN_MUTEX_UNLOCK (chain);
 
     /* Set connection-speed property if needed */