[gst-devel] does signal has last param user_data in gstreamer?

[Edward Hervey]

On Thu, 2011-01-06 at 16:31 +0100, Farkas Levente wrote:
> hi,
> then the two signal definition in input-selector is bad? or..
> http://cgit.freedesktop.org/gstreamer/gstreamer/tree/plugins/elements/gstinputselector.h
> since there is no last argument user_data?

  Those are the vmethod implementations called *on* the object (read
more of the gobject docs to understand what I mean).
  user_data is only used in the callbacks and added by the signalling
system auto-magically.

    Edward

> 
> On 01/06/2011 03:29 PM, Guillaume Emont wrote:
> > Hi Farkas,
> > 
> > That is indeed a gobject signal thing: when you connect [1] to a signal,
> > you specify a "user_data" pointer to pass to the callback you're
> > attaching, whatever the signal.
> > This is all should be explained in the signal section of the GObject
> > Reference Manual [2].
> > 
> > Guillaume
> > 
> > [1]
> > http://library.gnome.org/devel/gobject/2.26/gobject-Signals.html#g-signal-connect
> > [2] http://library.gnome.org/devel/gobject/2.26/signal.html
> > 
> > On 06/01/2011 14:50, Farkas Levente wrote:
> >> hi,
> >> let see an example: both gst-inspect input-selector and
> >> http://www.gstreamer.net/data/doc/gstreamer/head/gst-plugins-bad-plugins/html/gst-plugins-bad-plugins-input-selector.html
> >> said that the signal "switch" has a last argument as
> >> gpointer user_data
> >> and the signal "block" has no such last argument in the gst-inspect
> >> output, but has in the above docs.
> >> but when i look onto the source code in gstinputselector.h none of these
> >> signal has last param!
> >>
> >> since there are many signal (almos all) which has last param user_data
> >> so my questions in general:
> >> is the last param user_data exist or not at all? or it's something glib
> >> specific thing or ...?
> >> thanks in advance.
> >> regards.
> >>
> > 
> > 
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