RR SDK with GStreamer

I really want to access the camera data from the fakesink buffer in the cb_handoff. For some reason this function does not even get called. Can anyone be of help here?

I have also attached the output when i run this application, maybe i am not using the g_signal_connect appropriately.

#include <string.h>
#include <gst/gst.h>

#define VIDEO_SRC "v4l2src"
#define VIDEO_SINK "TIDmaiVideoSink"

typedef struct
{
    void *buffer;
    unsigned int buffer_size;
    int width;
    int height;
}MainData;
static void
cb_handoff (GstElement *fakesink,
     GstBuffer *buffer,
     GstPad     *pad,
     MainData *user_data)
{
     unsigned int tbuffersize;
    user_data->width=666;
    /*tbuffersize=GST_BUFFER_SIZE (buffer);
    if(!user_data->buffer || user_data->buffer_size != tbuffersize)
    {
        GstCaps * caps;
        GstStructure *structure;
        if(user_data->buffer)
            free(user_data->buffer);
        user_data->buffer=(void*) malloc(tbuffersize * sizeof(void));
        user_data->buffer_size=tbuffersize;

        caps=gst_buffer_get_caps(buffer);
        structure = gst_caps_get_structure(caps, 0);
        gst_structure_get_int(structure, "width", &user_data->width);
        gst_structure_get_int(structure, "height", &user_data->height);
        gst_caps_unref(caps);
    }
   
    memcpy(user_data->buffer, GST_BUFFER_DATA(buffer), tbuffersize);*/
   
}
gint
main (gint    argc,
       gchar *argv[])
{
    MainData *main_data;
    main_data=g_new0(MainData, 1);
    main_data->buffer=NULL;
    main_data->width=40;
    main_data->height=80;
    main_data->buffer_size=0;
    int itv, pixelD;

    GstElement *pipeline, *camera_src, *fakesink;
    GstElement *csp_filter;
    GstCaps *caps;
    GMainLoop *loop;
      /* init GStreamer */
      gst_init (&argc, &argv);
      loop = g_main_loop_new (NULL, FALSE);
      /* setup pipeline */
      pipeline = gst_pipeline_new ("test-camera");
    camera_src=gst_element_factory_make(VIDEO_SRC, "camera_src");
    csp_filter = gst_element_factory_make ("ffmpegcolorspace", "csp_filter");
    fakesink = gst_element_factory_make ("fakesink","sink");
   
    if(!(pipeline && camera_src && csp_filter && fakesink))
    {
        g_critical("Could not create pipeline elements");
        return FALSE;
    }
    else
    {     g_print("Pipeline elements ready");}

   

    gst_bin_add_many (GST_BIN (pipeline), camera_src, csp_filter, fakesink, NULL);


    caps = gst_caps_new_simple("video/x-raw-rgb",
            "width", G_TYPE_INT, 640,
            "height", G_TYPE_INT, 480,
            NULL);
    if(!gst_element_link_filtered(camera_src, csp_filter, caps))
    {
        g_print("Camera CANNOT linked to fiter at VGA size!!\n");
        return FALSE;
    }
    else
    {
        g_print("Camera linked to fiter at VGA size!!\n");
    }

    gst_caps_unref(caps);
   
    if(!gst_element_link(csp_filter, fakesink))
    {
        g_print("csp filter could not link to fakesink\n");
    }
    else
    {
        g_print("Csp filter successfully linked to fakesink!!\n");
    }
   
    g_object_set(G_OBJECT(fakesink), "signal-handoffs", TRUE, NULL);
    g_signal_connect (fakesink, "handoff", G_CALLBACK (cb_handoff), main_data);

      gst_element_set_state (pipeline, GST_STATE_PLAYING);

   

    g_print("print pixels out\n");

    g_print("The image is of width %i and height %i\n",main_data->width, main_data->height);

    /*for(itv=0;itv<(640*480);itv+=100)
    {
        pixelD=main_data->buffer[itv];
        g_print("pixel[%i]=%i",itv,pixelD);   
    }*/

      g_main_loop_run (loop);

      /* clean up */
      gst_element_set_state (pipeline, GST_STATE_NULL);
      gst_object_unref (GST_OBJECT (pipeline));

    if(main_data->buffer)
        free(main_data->buffer);
      return 0;
}
======output=============

/examples # ./gst-test
Pipeline elements readyCamera linked to fiter at VGA size!!
[42949435.560000] mt9v113 1-003c: invalid control id 9963781
Csp filter succe[42949435.570000] mt9v113 1-003c: invalid control id 9963782
ssfully linked t[42949435.570000] mt9v113 1-003c: invalid control id 9963783
o fakesink!!
[42949435.580000] mt9v113 1-003c: invalid control id 9963784
[42949435.590000] mt9v113 1-003c: invalid control id 9963785
[42949435.590000] mt9v113 1-003c: invalid control id 9963786
[42949435.600000] mt9v113 1-003c: invalid control id 9963787
[42949435.600000] mt9v113 1-003c: invalid control id 9963788
[42949435.610000] mt9v113 1-003c: invalid control id 9963789
[42949435.610000] mt9v113 1-003c: invalid control id 9963790
[42949435.620000] mt9v113 1-003c: invalid control id 9963791
[42949435.630000] mt9v113 1-003c: invalid control id 9963792
[42949435.630000] mt9v113 1-003c: invalid control id 9963793
[42949435.640000] mt9v113 1-003c: invalid control id 9963796
[42949435.640000] mt9v113 1-003c: invalid control id 9963797
[42949435.650000] mt9v113 1-003c: invalid control id 9963798
[42949435.650000] mt9v113 1-003c: invalid control id 9963799
[42949435.660000] mt9v113 1-003c: invalid control id 9963800
[42949435.670000] mt9v113 1-003c: invalid control id 9963801
[42949435.670000] mt9v113 1-003c: invalid control id 9963802
[42949435.680000] mt9v113 1-003c: invalid control id 9963803
[42949435.680000] mt9v113 1-003c: invalid control id 9963804
[42949435.690000] mt9v113 1-003c: invalid control id 9963805
[42949435.690000] mt9v113 1-003c: invalid control id 9963806
print pixels out
The image is of width 40 and height 80
-------------------

i was expecting the width to change from 40 to 666 when the cb_handoff get called. Am i doing something wrong here?