Small cleanups.

Original commit message from CVS:
* sys/v4l2/gstv4l2object.c: (gst_v4l2_object_set_property_helper),
(gst_v4l2_set_defaults):
* sys/v4l2/gstv4l2src.c: (gst_v4l2src_get_read),
(gst_v4l2src_create):
* sys/v4l2/gstv4l2xoverlay.c: (gst_v4l2_xoverlay_open):
* sys/v4l2/v4l2_calls.c: (gst_v4l2_get_capabilities),
(gst_v4l2_fill_lists), (gst_v4l2_open), (gst_v4l2_set_norm),
(gst_v4l2_get_frequency), (gst_v4l2_set_frequency),
(gst_v4l2_signal_strength), (gst_v4l2_get_attribute),
(gst_v4l2_set_attribute), (gst_v4l2_get_input),
(gst_v4l2_set_input):
* sys/v4l2/v4l2src_calls.c: (gst_v4l2src_fill_format_list),
(gst_v4l2src_grab_frame), (gst_v4l2src_get_capture),
(gst_v4l2src_set_capture), (gst_v4l2src_capture_init),
(gst_v4l2src_capture_start), (gst_v4l2src_capture_stop),
(gst_v4l2src_buffer_new):
* tests/icles/v4l2src-test.c: (my_bus_callback), (main):
Small cleanups.
Fix error messages.
Use locks when getting timestamps.
Fix leaks in test.
Add licensing header to tests.

6 files changed, 99 insertions, 60 deletions

diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index 5d08a6ad..bb834de0 100644
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -308,8 +308,7 @@ gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
 {
   switch (prop_id) {
     case PROP_DEVICE:
-      if (v4l2object->videodev)
-        g_free (v4l2object->videodev);
+      g_free (v4l2object->videodev);
       v4l2object->videodev = g_value_dup_string (value);
       break;
     case PROP_STD:
@@ -436,9 +435,7 @@ gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
     norm =
         GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element)));
     if (norm) {
-      if (v4l2object->std) {
-        g_free (v4l2object->std);
-      }
+      g_free (v4l2object->std);
       v4l2object->std = g_strdup (norm->label);
       gst_tuner_norm_changed (tuner, norm);
       g_object_notify (G_OBJECT (v4l2object->element), "std");
@@ -453,9 +450,7 @@ gst_v4l2_set_defaults (GstV4l2Object * v4l2object)
     channel =
         GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->
                 element)));
-    if (v4l2object->input) {
-      g_free (v4l2object->input);
-    }
+    g_free (v4l2object->input);
     v4l2object->input = g_strdup (channel->label);
     gst_tuner_channel_changed (tuner, channel);
     g_object_notify (G_OBJECT (v4l2object->element), "input");
diff --git a/sys/v4l2/gstv4l2src.c b/sys/v4l2/gstv4l2src.c
index 7b943f17..9e0c925d 100644
--- a/sys/v4l2/gstv4l2src.c
+++ b/sys/v4l2/gstv4l2src.c
@@ -934,7 +934,7 @@ gst_v4l2src_get_read (GstV4l2Src * v4l2src, GstBuffer ** buf)
 read_error:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SYNC,
-        (_("error read()ing %d bytes on device %s"),
+        (_("Error read()ing %d bytes on device %s."),
             buffersize, v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
     gst_buffer_unref (*buf);
     return GST_FLOW_ERROR;
@@ -942,7 +942,7 @@ read_error:
 short_read:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SYNC, (NULL),
-        ("error read()ing a buffer on device %s: got only %d bytes instead of expected %d",
+        ("Error read()ing a buffer on device %s: got only %d bytes instead of expected %d.",
             v4l2src->v4l2object->videodev, amount, buffersize));
     gst_buffer_unref (*buf);
     return GST_FLOW_ERROR;
@@ -1018,8 +1018,8 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
 no_framerate:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
-        (_("could not get frame rate for %s, try to set use-undef-fps "
-                "property to true"), v4l2src->v4l2object->videodev), (NULL));
+        (_("Could not get frame rate for %s, try to set use-undef-fps "
+                "property to true."), v4l2src->v4l2object->videodev), (NULL));
     return GST_FLOW_ERROR;
   }
 }
diff --git a/sys/v4l2/gstv4l2xoverlay.c b/sys/v4l2/gstv4l2xoverlay.c
index 817733b6..5a07e510 100644
--- a/sys/v4l2/gstv4l2xoverlay.c
+++ b/sys/v4l2/gstv4l2xoverlay.c
@@ -99,7 +99,7 @@ gst_v4l2_xoverlay_open (GstV4l2Object * v4l2object)
   }
   if (fstat (v4l2object->video_fd, &s) < 0) {
     GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
-        (_("Cannot identify device '%s'"), v4l2object->videodev),
+        (_("Cannot identify device '%s'."), v4l2object->videodev),
         GST_ERROR_SYSTEM);
     XCloseDisplay (dpy);
     return;
diff --git a/sys/v4l2/v4l2_calls.c b/sys/v4l2/v4l2_calls.c
index 318508cf..6570517a 100644
--- a/sys/v4l2/v4l2_calls.c
+++ b/sys/v4l2/v4l2_calls.c
@@ -65,8 +65,8 @@ gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
 cap_failed:
   {
     GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Error getting capabilities for device '%s':"
-                " It isn't a v4l2 driver. Check if it is a v4l1 driver"),
+        (_("Error getting capabilities for device '%s': "
+                "It isn't a v4l2 driver. Check if it is a v4l1 driver."),
             v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -99,7 +99,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
         break;                  /* end of enumeration */
       else {
         GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
-            ("Failed to get %d in input enumeration for %s",
+            (_("Failed to get %d in input enumeration for %s."),
                 n, v4l2object->videodev), GST_ERROR_SYSTEM);
         return FALSE;
       }
@@ -119,7 +119,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
       vtun.index = input.tuner;
       if (ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
         GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
-            ("Failed to get tuner %d settings on %s",
+            (_("Failed to get tuner %d settings on %s."),
                 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
         g_object_unref (G_OBJECT (channel));
         return FALSE;
@@ -155,7 +155,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
         break;                  /* end of enumeration */
       else {
         GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
-            ("Failed to get %d in norm enumeration for %s",
+            (_("Failed to get %d in norm enumeration for %s."),
                 n, v4l2object->videodev), GST_ERROR_SYSTEM);
         return FALSE;
       }
@@ -197,7 +197,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
           break;
       } else {
         GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
-            ("Failed to get %d in control enumeration for %s",
+            (_("Failed to get %d in control enumeration for %s."),
                 n, v4l2object->videodev), GST_ERROR_SYSTEM);
         return FALSE;
       }
@@ -266,7 +266,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
             break;              /* end of enumeration */
           else {
             GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
-                ("Failed to get %d in menu enumeration for %s",
+                (_("Failed to get %d in menu enumeration for %s"),
                     n, v4l2object->videodev), GST_ERROR_SYSTEM);
             return FALSE;
           }
@@ -382,14 +382,14 @@ gst_v4l2_open (GstV4l2Object * v4l2object)
 stat_failed:
   {
     GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
-        (_("Cannot identify device '%s'"), v4l2object->videodev),
+        (_("Cannot identify device '%s'."), v4l2object->videodev),
         GST_ERROR_SYSTEM);
     goto error;
   }
 no_device:
   {
     GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
-        (_("This isn't a device '%s'"), v4l2object->videodev),
+        (_("This isn't a device '%s'."), v4l2object->videodev),
         GST_ERROR_SYSTEM);
     goto error;
   }
@@ -498,7 +498,7 @@ gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
 std_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to set norm 0x%llx for device %s: %s"),
+        (_("Failed to set norm 0x%llx for device %s: %s."),
             norm, v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -535,7 +535,7 @@ gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
 freq_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to get current tuner frequency for device %s"),
+        (_("Failed to get current tuner frequency for device %s."),
             v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -576,7 +576,7 @@ gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
 freq_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to set current tuner frequency for device %s to %lu"),
+        (_("Failed to set current tuner frequency for device %s to %lu."),
             v4l2object->videodev, frequency), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -610,7 +610,7 @@ gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
 tuner_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to get signal strength for device %s"),
+        (_("Failed to get signal strength for device %s."),
             v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -646,7 +646,7 @@ gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
 ctrl_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to get value for control %d on device %s"),
+        (_("Failed to get value for control %d on device %s."),
             attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -681,7 +681,7 @@ gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
 ctrl_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to set value %d for control %d on device %s"),
+        (_("Failed to set value %d for control %d on device %s."),
             value, attribute_num, v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -708,7 +708,7 @@ gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
 input_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to get current input on device %s"),
+        (_("Failed to get current input on device %s."),
             v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -731,7 +731,7 @@ gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
 input_failed:
   {
     GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS,
-        (_("Failed to set input %d on device %s"),
+        (_("Failed to set input %d on device %s."),
             input, v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
diff --git a/sys/v4l2/v4l2src_calls.c b/sys/v4l2/v4l2src_calls.c
index 489c1118..22995ee0 100644
--- a/sys/v4l2/v4l2src_calls.c
+++ b/sys/v4l2/v4l2src_calls.c
@@ -92,7 +92,7 @@ gst_v4l2src_fill_format_list (GstV4l2Src * v4l2src)
 failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
-        (_("failed to get number %d in pixelformat enumeration for %s: %s"),
+        (_("Failed to get number %d in pixelformat enumeration for %s."),
             n, v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
     g_free (format);
     return FALSE;
@@ -185,7 +185,7 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src)
         break;
       default:
         GST_ELEMENT_WARNING (v4l2src, RESOURCE, FAILED,
-            (_("Grabbing frame got interrupted on %s. No expected reason"),
+            (_("Grabbing frame got interrupted on %s. No expected reason."),
                 v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
         break;
     }
@@ -208,7 +208,7 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src)
 einval:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
-        (_("Failed trying to get frames from device %s"),
+        (_("Failed trying to get frames from device %s."),
             v4l2src->v4l2object->videodev),
         (_("The buffer type is not supported, or the index is out of bounds,"
                 " or no buffers have been allocated yet, or the userptr"
@@ -219,18 +219,18 @@ einval:
 nomem:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
-        (_("Failed trying to get frames from device %s. Not enough memory"),
+        (_("Failed trying to get frames from device %s. Not enough memory."),
             v4l2src->v4l2object->videodev),
-        (_("insufficient memory to enqueue a user pointer buffer. device %s"),
+        (_("insufficient memory to enqueue a user pointer buffer. device %s."),
             v4l2src->v4l2object->videodev));
     return -1;
   }
 too_many_trials:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, FAILED,
-        (_("Failed trying to get frames from device %s"),
+        (_("Failed trying to get frames from device %s."),
             v4l2src->v4l2object->videodev),
-        (_("Failed after 100 tries. device %s"),
+        (_("Failed after 100 tries. device %s."),
             v4l2src->v4l2object->videodev));
     return -1;
   }
@@ -261,7 +261,7 @@ gst_v4l2src_get_capture (GstV4l2Src * v4l2src)
 fmt_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
-        (_("failed to get pixelformat for device %s"),
+        (_("Failed to get pixelformat for device %s."),
             v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -340,7 +340,7 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src,
 fmt_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
-        (_("failed to set pixelformat to %s @ %dx%d for device %s: %s"),
+        (_("Failed to set pixelformat to %s @ %dx%d for device %s: %s."),
             fmt->description, *width, *height, v4l2src->v4l2object->videodev),
         GST_ERROR_SYSTEM);
     return FALSE;
@@ -348,13 +348,14 @@ fmt_failed:
 pixfmt_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, SETTINGS,
-        (_("failed to set pixelformat to %s @ %dx%d for device %s: %s"),
+        (_("Failed to set pixelformat to %s @ %dx%d for device %s: %s."),
             fmt->description, *width, *height, v4l2src->v4l2object->videodev),
         GST_ERROR_SYSTEM);
     return FALSE;
   }
 fail:
   {
+    /* ERROR was posted */
     return FALSE;
   }
 }
@@ -474,7 +475,7 @@ reqbufs_failed:
 broken_driver:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
-        (_("the driver of device '%s' is broken."),
+        (_("The driver of device '%s' is broken."),
             v4l2src->v4l2object->videodev),
         ("no supported read capability from %s",
             v4l2src->v4l2object->videodev));
@@ -493,7 +494,7 @@ no_buffers:
 querybuf_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
-        (_("Could not get buffer properties of buffer %d"), n),
+        (_("Could not get buffer properties of buffer %d."), n),
         GST_ERROR_SYSTEM);
     gst_v4l2src_capture_deinit (v4l2src);
     return FALSE;
@@ -501,7 +502,7 @@ querybuf_failed:
 mmap_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, READ,
-        (_("Could not mmap video buffer %d: %s"), n), GST_ERROR_SYSTEM);
+        (_("Could not mmap video buffer %d."), n), GST_ERROR_SYSTEM);
     gst_v4l2src_capture_deinit (v4l2src);
     buffer->start = 0;
     return FALSE;
@@ -544,7 +545,7 @@ gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
 streamon_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, OPEN_READ,
-        (_("Error starting streaming capture from device %s"),
+        (_("Error starting streaming capture from device %s."),
             v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -582,7 +583,7 @@ gst_v4l2src_capture_stop (GstV4l2Src * v4l2src)
 streamoff_failed:
   {
     GST_ELEMENT_ERROR (v4l2src, RESOURCE, CLOSE,
-        (_("Error stopping streaming capture from device %s: %s"),
+        (_("Error stopping streaming capture from device %s."),
             v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
     return FALSE;
   }
@@ -922,6 +923,8 @@ gst_v4l2src_buffer_new (GstV4l2Src * v4l2src, guint size, guint8 * data,
     GstV4l2Buffer * srcbuf)
 {
   GstBuffer *buf;
+  GstClockTime timestamp, duration;
+  GstClock *clock;
 
   if (data == NULL) {
     buf = gst_buffer_new_and_alloc (size);
@@ -934,18 +937,38 @@ gst_v4l2src_buffer_new (GstV4l2Src * v4l2src, guint size, guint8 * data,
   }
   GST_BUFFER_SIZE (buf) = size;
 
-  GST_BUFFER_TIMESTAMP (buf) =
-      gst_clock_get_time (GST_ELEMENT (v4l2src)->clock);
-  GST_BUFFER_TIMESTAMP (buf) -= GST_ELEMENT (v4l2src)->base_time;
-  GST_BUFFER_OFFSET (buf) = v4l2src->offset++;
-
   GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_READONLY);
+
+  /* timestamps, LOCK to get clock and base time. */
+  GST_OBJECT_LOCK (v4l2src);
+  if ((clock = GST_ELEMENT_CLOCK (v4l2src))) {
+    /* we have a clock, get base time and ref clock */
+    timestamp = GST_ELEMENT (v4l2src)->base_time;
+    gst_object_ref (clock);
+  } else {
+    /* no clock, can't set timestamps */
+    timestamp = GST_CLOCK_TIME_NONE;
+  }
+  GST_OBJECT_UNLOCK (v4l2src);
+
+  if (clock) {
+    /* the time now is the time of the clock minus the base time */
+    timestamp = gst_clock_get_time (clock) - timestamp;
+    gst_object_unref (clock);
+  }
+
   if (v4l2src->fps_n > 0) {
-    GST_BUFFER_DURATION (buf) =
+    duration =
         gst_util_uint64_scale_int (GST_SECOND, v4l2src->fps_d, v4l2src->fps_n);
   } else {
-    GST_BUFFER_DURATION (buf) = GST_CLOCK_TIME_NONE;
+    duration = GST_CLOCK_TIME_NONE;
   }
+  GST_BUFFER_TIMESTAMP (buf) = timestamp;
+  GST_BUFFER_DURATION (buf) = duration;
+
+  /* offsets */
+  GST_BUFFER_OFFSET (buf) = v4l2src->offset++;
+  GST_BUFFER_OFFSET_END (buf) = v4l2src->offset;
 
   /* the negotiate() method already set caps on the source pad */
   gst_buffer_set_caps (buf, GST_PAD_CAPS (GST_BASE_SRC_PAD (v4l2src)));
diff --git a/tests/icles/v4l2src-test.c b/tests/icles/v4l2src-test.c
index cb2e98fa..a81c357d 100644
--- a/tests/icles/v4l2src-test.c
+++ b/tests/icles/v4l2src-test.c
@@ -1,3 +1,24 @@
+/* GStreamer
+ *
+ * Copyright (C) 2006 Edgard Lima <edgard dot lima at indt dot org dot br>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <getopt.h>
@@ -300,10 +321,12 @@ my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
     case GST_MESSAGE_ERROR:{
       GError *err;
       gchar *debug;
+      gchar *str;
 
       gst_message_parse_error (message, &err, &debug);
-      g_print ("%s error: %s\n",
-          gst_element_get_name (message->src), err->message);
+      str = gst_element_get_name (message->src);
+      g_print ("%s error: %s\n", str, err->message);
+      g_free (str);
       g_print ("Debug: %s\n", debug);
 
       g_error_free (err);
@@ -336,7 +359,7 @@ main (int argc, char *argv[])
   gchar input[128] = { '\0' };
   gulong frequency = 0;
   gboolean undeffps = FALSE;
-
+  GstBus *bus;
 
   /* see for input option */
 
@@ -420,7 +443,6 @@ main (int argc, char *argv[])
     }
   }
 
-
   /* Print any remaining command line arguments (not options). */
   if (optind < argc) {
     printf ("Use -h to see help message.\n" "non-option ARGV-elements: ");
@@ -429,8 +451,6 @@ main (int argc, char *argv[])
     putchar ('\n');
   }
 
-
-
   /* init */
   gst_init (&argc, &argv);
 
@@ -469,8 +489,8 @@ main (int argc, char *argv[])
   }
 
   /* you would normally check that the elements were created properly */
-  gst_bus_add_watch (gst_pipeline_get_bus (GST_PIPELINE (pipeline)),
-      my_bus_callback, NULL);
+  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
+  gst_bus_add_watch (bus, my_bus_callback, NULL);
 
   /* put together a pipeline */
   gst_bin_add_many (GST_BIN (pipeline), source, sink, NULL);
@@ -490,6 +510,7 @@ main (int argc, char *argv[])
 
   gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
 
+  gst_object_unref (bus);
   gst_object_unref (pipeline);
 
   gst_deinit ();