Which event or message can be safely simulate android's MEDIA_PREPARED?

[lucky chou]

I use gstreamer　1.8.1 to instead of  MediaPlayer in Android,  looking for a
gstreamer internal events or messages used to achieve the same effect in
MEDIA_PREPARED of MediaPlayer（perhaps the first frame is decoded ? or the
filtergraph just switch to paused），it mean that when the downstream  is
ready, the upper application can safely do some operations.

The previous code, I was using the message :: async-done to simulate
MEDIA_PREPARED, registered playbin of async-done event callback function,
----------------------------
  bus = gst_element_get_bus (self-> playbin);
  g_signal_connect (G_OBJECT (bus), "message :: async-done", G_CALLBACK
(async_done_cb),
       self);
----------------------------
however, recent play with rtsp ipcamera, we found into the following piece
of code,that is async-done discarded.
-------------------
gst-plugins-base-1.0-static-1.8/gst/playback/gstplaybin2.c
gst_play_bin_handle_message() L2884

static void
gst_play_bin_handle_message (GstBin * bin, GstMessage * msg)
{
  GstPlayBin *playbin = GST_PLAY_BIN (bin);
  GstSourceGroup *group;
 .....

 else if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ASYNC_START ||
      GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ASYNC_DONE) {
    GstObject *src = GST_OBJECT_CAST (msg->src);

    /* Ignore async state changes from the uridecodebin children,
     * see bug #602000. */
    group = playbin->curr_group;
    if (src && group &&
        ((group->uridecodebin && src == GST_OBJECT_CAST
(group->uridecodebin))
            || (group->suburidecodebin
                && src == GST_OBJECT_CAST (group->suburidecodebin)))) {
      GST_DEBUG_OBJECT (playbin,
          "Ignoring async state change of uridecodebin: %s",
          GST_OBJECT_NAME (src));
      gst_message_unref (msg);
      msg = NULL;
    }

  .....
}

I don't know which one  event or message can better simulate MEDIA_PREPARED，
any suggestion would be appreciated. 

Best regards, 
c





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