[gst-devel] Specifying a different context for gst_bus_add_watch()

[Karthik V]

I noticed that the BusHandler function does get called a few times in the
beginning, but the 'end of stream' event fails to trigger a callback, for
some reason. If I replace g_main_context_new() by g_main_context_default(),
I get callback during when end of stream occurs.
Does anyone have any idea what could be wrong with EOS alone?



On Thu, Nov 13, 2008 at 2:40 PM, Karthik V <karthikveeramani at gmail.com>wrote:

> Thanks Wim.
> I did the same but still didn't get the pipeline events. I confirmed that I
> do get the events if I use the default context. My code now looks like this:
>
>              GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE (pipe));
>  if ( ( source = gst_bus_create_watch(bus) ) == NULL )
> {
> cout << "Unable to create sourced for bus watch";
>  }
> cout << "Created source";
>  g_source_set_callback(source, (GSourceFunc) BusHandler, data, NULL);
> cout << "Set callback";
>  busWatchId = g_source_attach(source, loopContext);
> cout << "Attached source. Id = " << busWatchId;
>  g_source_unref(source);
> gst_object_unref (bus);
>
>
> The handler function (I retained what I had earlier when I used
> gst_bus_add_watch() ),
> gboolean BusHandler(GstBus *bus, GstMessage *message, gpointer data)
> {
>  cout << "Handler called";
> }
>
>
> And elsewhere in the code,
>
>              GMainContext *context = g_main_context_new();
>              GMainLoop *loop = g_main_loop_new(context, false);
>              g_main_loop_run(loop);
>
>
>
>
> On Thu, Nov 13, 2008 at 10:33 AM, Wim Taymans <wim.taymans at gmail.com>wrote:
>
>> On Thu, 2008-11-13 at 10:16 -0800, Karthik V wrote:
>> > Hello All,
>> >
>> >
>> > I would like to run my g_main_loop in a separate context, so did
>> > something like this
>> >
>> >
>> > GMainContext *c = g_main_context_new();
>> > GMainLoop *l = g_main_loop_new(c, false);
>> > g_main_loop_run(l);
>> >
>> >
>> > My bus watch code goes like this:
>> > GstBus *bus = gst_pipeline_get_bus(pipe);
>> > gst_bus_add_watch(bus, BusHandler, NULL);
>> >
>> >
>> > If I run my main loop in the default context (by passing NULL), I
>> > receive call backs when there is an event on the bus. But after I
>> > moved it to a new context, I don't get the events anymore. Looking
>> > into the documentation, it looks like gst_bus_add_watch() adds watch
>> > only to the default context.
>> >
>> >
>> > Could someone tell me how to add watch to my own context, please?
>>
>> You want something like this:
>>
>>  GSource *source;
>>
>>  source = gst_bus_create_watch (bus);
>>
>>  g_source_set_callback (source, (GSourceFunc) func, user_data, notify);
>>
>>  /* now attach to the custom context c */
>>  id = g_source_attach (source, c);
>>  g_source_unref (source);
>>  ...
>>
>> Wim
>>
>>
>>
>>
>> >
>> >
>> > Thanks
>> > Karthik
>> >
>> >
>> >
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