From 2f5d6d60edd4ebee10345f6318813f1af30ba2ab Mon Sep 17 00:00:00 2001
From: Rafostar <40623528+Rafostar@users.noreply.github.com>
Date: Thu, 6 May 2021 14:22:48 +0200
Subject: [PATCH] API: add debug messages about dropped buffers

---
 lib/gst/clapper/gstclapper.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/gst/clapper/gstclapper.c b/lib/gst/clapper/gstclapper.c
index 17dd69ef..b9c6f41f 100644
--- a/lib/gst/clapper/gstclapper.c
+++ b/lib/gst/clapper/gstclapper.c
@@ -1891,6 +1891,27 @@ element_cb (G_GNUC_UNUSED GstBus * bus, GstMessage * msg, gpointer user_data)
   }
 }
 
+static void
+qos_cb (G_GNUC_UNUSED GstBus * bus, GstMessage * msg, gpointer user_data)
+{
+  GstClapper *self = GST_CLAPPER (user_data);
+  gboolean live;
+  guint64 running_time, stream_time, timestamp, duration;
+
+  gst_message_parse_qos (msg, &live, &running_time, &stream_time,
+      &timestamp, &duration);
+
+  GST_DEBUG_OBJECT (self, "QOS dropped buffer"
+      ", element live: %s"
+      ", running time: %" GST_TIME_FORMAT
+      ", stream time: %" GST_TIME_FORMAT
+      ", timestamp: %" GST_TIME_FORMAT
+      ", duration: %" GST_TIME_FORMAT,
+      live ? "yes" : "no", GST_TIME_ARGS (running_time),
+      GST_TIME_ARGS (stream_time), GST_TIME_ARGS (timestamp),
+      GST_TIME_ARGS (duration));
+}
+
 /* Must be called with lock */
 static gboolean
 update_stream_collection (GstClapper * self, GstStreamCollection * collection)
@@ -2926,6 +2947,9 @@ gst_clapper_main (gpointer data)
   g_signal_connect (G_OBJECT (bus), "message::tag", G_CALLBACK (tags_cb), self);
   g_signal_connect (G_OBJECT (bus), "message::toc", G_CALLBACK (toc_cb), self);
 
+  if (gst_debug_category_get_threshold (gst_clapper_debug) >= GST_LEVEL_DEBUG)
+    g_signal_connect (G_OBJECT (bus), "message::qos", G_CALLBACK (qos_cb), self);
+
   if (self->use_playbin3) {
     g_signal_connect (G_OBJECT (bus), "message::stream-collection",
         G_CALLBACK (stream_collection_cb), self);