[gst-devel] state change

[arnabsamanta]

Hi Zhang ,

            Thanks for your reply
            Did you mean the following in the _class_init ( ) ?
            If so then yes, i have done that .

       static void gst_queue3_class_init (Gstqueue3Class * klass)
        {

                GstElementClass *gstelement_class;
                 gstelement_class = (GstElementClass *) klass;


                 gstelement_class->change_state = GST_DEBUG_FUNCPTR
(gst_queue3_change_state);
        }

    Regards,
            ~Arnab



  -----Original Message-----
  From: Eric Zhang [mailto:nicolas.m.zhang at gmail.com]
  Sent: Friday, November 14, 2008 7:43 AM
  To: arnabsamanta at tataelxsi.co.in; Discussion of the development of
GStreamer
  Subject: Re: [gst-devel] state change


  Hi, gstreamer-devel:

      Did you override the `change_state' function pointer in your element's
`_class_init' function?

  Eric Zhang


  2008/11/13 arnabsamanta <arnabsamanta at tataelxsi.co.in>

     Hi All,
           during state change of my plug in i am calling a function
QUEUE3_De_Init()
    but its not getting called .
           QUEUE3_De_Init() de-initializes all the initialized variables in
the code.
           the implementation is as such

            static GstStateChangeReturn gst_queue3_change_state (GstElement
* element,
    GstStateChange transition)
           {
           Gstqueue3 *queue3;
           abuffer = GST_QUEUE3 (element);

           GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

           switch (transition) {
                   case GST_STATE_CHANGE_NULL_TO_READY:
                           break;
                   case GST_STATE_CHANGE_READY_TO_PAUSED:
                           break;
                   case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
                           break;
                   default:
                           break;
           }

           ret = GST_ELEMENT_CLASS (parent_class)->change_state (element,
    transition);

           switch (transition) {
                   case GST_STATE_CHANGE_PLAYING_TO_PAUSED:

                           break;
                   case GST_STATE_CHANGE_PAUSED_TO_READY:
                           break;
                   case GST_STATE_CHANGE_READY_TO_NULL:
                           QUEUE3_De_Init();
                           break;
                   default:
                           break;
           }


           So,
           can please somebody tell me how and where I can call the function
when am
    changing the state of the pipeline ?

     Regards,
           Arnab


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