AW: AW: Seems like set callbacks unsuccessful

[Erickson.LU]

Appreciate your reply and thanks a lot.
I haven't test your code...But I still think the problem is procedure of
constructing the pipeline.

Cause when i use 
*  gst_app_sink_set_drop(GST_APP_SINK(appsink), true);
    gst_app_sink_set_max_buffers(GST_APP_SINK(appsink), 1);
    gst_app_sink_set_callbacks(GST_APP_SINK(appsink), &appsinkCallbacks,
NULL, NULL);*
to set the callbacks.
The log will report critical error:
*** (test_now:21439): CRITICAL **: gst_app_sink_set_drop: assertion
'GST_IS_APP_SINK (appsink)' failed

** (test_now:21439): CRITICAL **: gst_app_sink_set_max_buffers: assertion
'GST_IS_APP_SINK (appsink)' failed

** (test_now:21439): CRITICAL **: gst_app_sink_set_callbacks: assertion
'GST_IS_APP_SINK (appsink)' failed
*

I think it cause i get a wrong appsink when i use "appsink =
gst_bin_get_by_name(GST_BIN(pipeline), appsink_name.c_str());" or the
pipeline is not ok, before i call set appcallbacks.




The procedure is below :
*      gst_init(&argc, &argv);
//    XInitThreads();
    boost::thread g_main_loop_thread0;

    GstAppSinkCallbacks appsinkCallbacks;
    std::string pipelineString = SINK0;
    std::string appsink_name="APP_SINK0";
    GError* err = 0;
//    pipeline = gst_parse_launch(pipelineString.c_str(), &err);


    pipeline =gst_pipeline_new(NULL);
    GstElement  *filter1 = gst_element_factory_make ("capsfilter", NULL);
    g_assert (filter1 != NULL); /* should always exist */
    GstElement  *filter2 = gst_element_factory_make ("capsfilter", NULL);
    g_assert (filter2 != NULL); /* should always exist */
    GstElement  *filter3 = gst_element_factory_make ("capsfilter", NULL);
    g_assert (filter3 != NULL); /* should always exist */
    GstElement *v4l2src,*nvvidconv_1,*nvvidconv_2;
    v4l2src = gst_element_factory_make("v4l2src", NULL);
    g_object_set (G_OBJECT (v4l2src), "device", "/dev/video0", NULL);
    nvvidconv_1 = gst_element_factory_make("videoconvert", NULL);
    nvvidconv_2 = gst_element_factory_make("videoconvert", NULL);
    appsink = gst_element_factory_make("appsink", "APP_SINK0");
    g_object_set (G_OBJECT (appsink), "name","APP_SINK","caps",
                 
gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"BGR","width",G_TYPE_INT,"640","height",G_TYPE_INT,"480","pixel-aspect-ratio",GST_TYPE_FRACTION,1,1,NULL),
                  NULL);


    GstCaps *number1 =
           
gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"YV12","width",G_TYPE_INT,"640","height",G_TYPE_INT,"480",NULL);
    GstCaps *number2 =
           
gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"I420","width",G_TYPE_INT,"640","height",G_TYPE_INT,"480",NULL);
    GstCaps *number3 =
           
gst_caps_new_simple("video/x-raw","format",G_TYPE_STRING,"BGR","width",G_TYPE_INT,"640","height",G_TYPE_INT,"480",NULL);
    g_object_set (G_OBJECT (filter1), "caps", number1, NULL);
    g_object_set (G_OBJECT (filter2), "caps", number2, NULL);
    g_object_set (G_OBJECT (filter3), "caps", number3, NULL);
    gst_bin_add_many(GST_BIN(pipeline), v4l2src,
                     filter1,nvvidconv_1,filter2,
nvvidconv_2,filter3,appsink, NULL);
    gst_element_link_many (v4l2src, filter1,nvvidconv_1,filter2,
                           nvvidconv_2,filter3,appsink, NULL);gst_caps_unref
(number1);


    bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
    gst_bus_add_watch(bus, (GstBusFunc)GstMessageParser, NULL);

//    g_main_loop_thread_ = boost::thread(RunMainLoop);
//    RunMainLoop();
    appsink = gst_bin_get_by_name(GST_BIN(pipeline), appsink_name.c_str());

    g_print("main thread lwpid = %u\n", syscall(SYS_gettid));
    g_print("main thread tid = %u\n", pthread_self());


    appsinkCallbacks.new_preroll = &PrerollCallback;
    appsinkCallbacks.new_sample = &SampleCallback;
//    appsinkCallbacks.eos = &EndOfStreamCallback;
    gst_app_sink_set_drop(GST_APP_SINK(appsink), true);
    gst_app_sink_set_max_buffers(GST_APP_SINK(appsink), 1);
    gst_app_sink_set_callbacks(GST_APP_SINK(appsink), &appsinkCallbacks,
NULL, NULL);


    GstStateChangeReturn ret = gst_element_set_state(pipeline,
GST_STATE_PLAYING);

    if (ret == GST_STATE_CHANGE_FAILURE) {
        g_printerr("Unable to set the pipeline to the playing state");
        gst_object_unref(pipeline);
        return false;
    }
    gst_caps_unref (number1);
    gst_caps_unref (number2);
    gst_caps_unref (number3);
 *

Regards 




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