gstplayer strange duration_changed signal

[lucky chou]

Hi all,
I’m using the gstreamer 1.8 gst-plugins-bad/gst-libs/gst/player/gstplayer
api to play some videos on an embedded system. The playback is fine, but I
get a strange problem when trying to get the duration  of the playback. In
particular, I regularly get duration from DURATION_CHANGED event,like
follow:
---------------------
 g_signal_connect(instance->internal_player,"duration-changed",
                     G_CALLBACK(myduration_changed_cb),instance);
 
.....

static void myduration_changed_cb(GstPlayer *p_internal_player,GstClockTime
dur,
                             gstreamer_player_t *instance) {

  if (dur != GST_CLOCK_TIME_NONE) 
        player_event_send(instance->pl_player,
PLAYER_EVENT_DURATION_CHANGED,
                (void *)pl_event_msg_obtain(PLAYER_EVENT_DURATION_CHANGED,
(int64_t)NS_TO_MS(dur), -1, NULL)); 
}

----------------------
My problem is that  when I  quickly switching URI 3~5 times, the duration
value which got from DURATION_CHANGED event was  previous duration value.

My sequence is following:


(1)init　gstplayer
gstplayer_init () {
........
    instance->renderer = gst_player_video_overlay_video_renderer_new(NULL);
    instance->internal_player = gst_player_new(instance->renderer, NULL);

........
    g_signal_connect(instance->internal_player,"duration-changed",
                     G_CALLBACK(myduration_changed_cb),instance);
  .....
}

(2)
         ...........
        gst_player_set_uri(instance->internal_player, cur_uri1);
        gst_player_play(instance->internal_player);

(3)
       .......
        gst_player_stop(instance->internal_player);
       ......


        gst_player_set_uri(instance->internal_player, cur_uri2);
        gst_player_play(instance->internal_player);


then ,repeat (2)~(3),just  pass to the gst_player_set_uri function's
parameters are different.
log:
---------------------------------
......

cur_uri1
05-06 09:42:46.084  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
275458 
05-06 09:42:47.139  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
225666
...
cur_uri2
05-06 09:44:11.659  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
225666(Obviously this is previous file's duration value)
05-06 09:44:12.764  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
286208
...
cur_uri3
05-06 09:45:28.759  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
286208(this is...)
05-06 09:45:29.789  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
277166

...
cur_uri4
05-06 09:47:31.574  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
277166(this is ...)
05-06 09:47:33.014  2323  2375PLAYER_EVENT_DURATION_CHANGED duration =
1998007
----------------------------------
When an anomaly occurs, play each URI my custom <myduration_changed_cb> func
1s interval  is called twice,
first is gstplayer.c state_changed_cb L1409  emit_duration_changed:
      check_video_dimensions_changed (self);
      gst_element_query_duration (self->playbin, GST_FORMAT_TIME,
&duration);
   =>   emit_duration_changed (self, duration);

second is gstplayer.c duration_changed_cb L1487,emit_duration_changed

    static void
duration_changed_cb (G_GNUC_UNUSED GstBus * bus, G_GNUC_UNUSED GstMessage *
msg,
    gpointer user_data)
{
  GstPlayer *self = GST_PLAYER (user_data);
  gint64 duration;

  if (gst_element_query_duration (self->playbin, GST_FORMAT_TIME,
&duration)) {
 =>   emit_duration_changed (self, duration);
  }
}

So，why does it need to be two emit_duration_changed, what is the difference
between the two?
. Is this some kind of bug, or am I missing something?

 
Thanks



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