tests: add example app for stream-status

Add an example application that adjusts the thread priority of a task using the
stream-status messages.

configure.ac

@@ -681,6 +681,7 @@ tests/examples/launch/Makefile
 tests/examples/manual/Makefile
 tests/examples/metadata/Makefile
 tests/examples/queue/Makefile
+tests/examples/streams/Makefile
 tests/examples/typefind/Makefile
 tests/examples/xml/Makefile
 tools/Makefile

tests/examples/Makefile.am

@@ -22,6 +22,7 @@ always_dirs = \
 	helloworld \
 	manual     \
 	metadata   \
+	streams    \
 	queue
 
 #appreader

tests/examples/streams/.gitignore

@@ -0,0 +1,5 @@
+stream-status
+*.bb
+*.bbg
+*.da
+stream-status-stream-status.gcno

tests/examples/streams/Makefile.am

@@ -0,0 +1,4 @@
+noinst_PROGRAMS = stream-status
+
+stream_status_LDADD = $(GST_OBJ_LIBS)
+stream_status_CFLAGS = $(GST_OBJ_CFLAGS)

tests/examples/streams/stream-status.c

@@ -0,0 +1,134 @@
+#include <stdlib.h>
+#include <gst/gst.h>
+
+static void
+event_loop (GstBus * bus, GstElement * pipe)
+{
+  GstMessage *message = NULL;
+
+  while (TRUE) {
+    message = gst_bus_poll (bus, GST_MESSAGE_ANY, -1);
+
+    g_assert (message != NULL);
+
+    switch (message->type) {
+      case GST_MESSAGE_EOS:
+        g_message ("received EOS");
+        gst_message_unref (message);
+        return;
+      case GST_MESSAGE_WARNING:
+      case GST_MESSAGE_ERROR:{
+        GError *gerror;
+        gchar *debug;
+
+        gst_message_parse_error (message, &gerror, &debug);
+        gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
+        gst_message_unref (message);
+        g_error_free (gerror);
+        g_free (debug);
+        return;
+      }
+      default:
+        gst_message_unref (message);
+        break;
+    }
+  }
+}
+
+static GstBusSyncReply
+sync_bus_handler (GstBus * bus, GstMessage * message, GstElement * bin)
+{
+  switch (GST_MESSAGE_TYPE (message)) {
+    case GST_MESSAGE_STREAM_STATUS:
+    {
+      GstStreamStatusType type;
+      GstElement *owner;
+      const GValue *val;
+      gchar *path;
+
+      g_message ("received STREAM_STATUS");
+      gst_message_parse_stream_status (message, &type, &owner);
+
+      val = gst_message_get_stream_status_object (message);
+
+      g_message ("type:   %d", type);
+      path = gst_object_get_path_string (GST_MESSAGE_SRC (message));
+      g_message ("source: %s", path);
+      g_free (path);
+      path = gst_object_get_path_string (GST_OBJECT (owner));
+      g_message ("owner:  %s", path);
+      g_free (path);
+      g_message ("object: type %s, value %p", G_VALUE_TYPE_NAME (val),
+          g_value_get_object (val));
+
+      switch (type) {
+        case GST_STREAM_STATUS_TYPE_ENTER:
+        {
+          /* see if we know how to deal with this object */
+          if (G_VALUE_TYPE (val) == GST_TYPE_TASK) {
+            GstTask *task;
+
+            task = g_value_get_object (val);
+
+            g_message ("raising task priority");
+            gst_task_set_priority (task, G_THREAD_PRIORITY_HIGH);
+          }
+          break;
+        }
+        case GST_STREAM_STATUS_TYPE_LEAVE:
+          break;
+        default:
+          break;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+  /* pass all messages on the async queue */
+  return GST_BUS_PASS;
+}
+
+int
+main (int argc, char *argv[])
+{
+  GstElement *bin, *fakesrc, *fakesink;
+  GstBus *bus;
+
+  gst_init (&argc, &argv);
+
+  /* create a new bin to hold the elements */
+  bin = gst_pipeline_new ("pipeline");
+  g_assert (bin);
+
+  /* create a source */
+  fakesrc = gst_element_factory_make ("fakesrc", "fakesrc");
+  g_assert (fakesrc);
+  g_object_set (fakesrc, "num-buffers", 50, NULL);
+
+  /* and a sink */
+  fakesink = gst_element_factory_make ("fakesink", "fakesink");
+  g_assert (fakesink);
+
+  /* add objects to the main pipeline */
+  gst_bin_add_many (GST_BIN (bin), fakesrc, fakesink, NULL);
+
+  /* link the elements */
+  gst_element_link (fakesrc, fakesink);
+
+  /* start playing */
+  gst_element_set_state (bin, GST_STATE_PLAYING);
+
+  /* get the bus, we need to install a sync handler */
+  bus = gst_pipeline_get_bus (GST_PIPELINE (bin));
+  gst_bus_set_sync_handler (bus, (GstBusSyncHandler) sync_bus_handler, bin);
+
+  /* Run event loop listening for bus messages until EOS or ERROR */
+  event_loop (bus, bin);
+
+  /* stop the bin */
+  gst_element_set_state (bin, GST_STATE_NULL);
+  gst_object_unref (bus);
+
+  exit (0);
+}