audiolatency: Drop incoming downstream stick events

stream-start, caps, and segment events will be pushed by internal
audiotestsrc element.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2271>

1 files changed, 22 insertions, 0 deletions

diff --git a/gst/audiolatency/gstaudiolatency.c b/gst/audiolatency/gstaudiolatency.c
index c4adb1569..cbdc83c89 100644
--- a/gst/audiolatency/gstaudiolatency.c
+++ b/gst/audiolatency/gstaudiolatency.c
@@ -94,6 +94,8 @@ static gint64 gst_audiolatency_get_latency (GstAudioLatency * self);
 static gint64 gst_audiolatency_get_average_latency (GstAudioLatency * self);
 static GstFlowReturn gst_audiolatency_sink_chain (GstPad * pad,
     GstObject * parent, GstBuffer * buffer);
+static gboolean gst_audiolatency_sink_event (GstPad * pad,
+    GstObject * parent, GstEvent * event);
 static GstPadProbeReturn gst_audiolatency_src_probe (GstPad * pad,
     GstPadProbeInfo * info, gpointer user_data);
 
@@ -182,6 +184,9 @@ gst_audiolatency_init (GstAudioLatency * self)
   self->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
   gst_pad_set_chain_function (self->sinkpad,
       GST_DEBUG_FUNCPTR (gst_audiolatency_sink_chain));
+  gst_pad_set_event_function (self->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_audiolatency_sink_event));
+
   gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
 
   /* Setup srcpad */
@@ -419,6 +424,23 @@ out:
   return GST_FLOW_OK;
 }
 
+static gboolean
+gst_audiolatency_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
+{
+  switch (GST_EVENT_TYPE (event)) {
+      /* Drop below events. audiotestsrc will push its own event */
+    case GST_EVENT_STREAM_START:
+    case GST_EVENT_CAPS:
+    case GST_EVENT_SEGMENT:
+      gst_event_unref (event);
+      return TRUE;
+    default:
+      break;
+  }
+
+  return gst_pad_event_default (pad, parent, event);
+}
+
 /* Element registration */
 static gboolean
 plugin_init (GstPlugin * plugin)