g_signal_connect question

[wanting2learn]

Look at the following code:

GstElement *source = gst_element_factory_make("rtspsrc", "source");

g_signal_connect(source, "pad-added", G_CALLBACK(on_rtsppad_added),
                   null );

Now depending on what element I want to make e.g. "rtspsrc" then I can call certain callbacks e.g. "pad-added" which will have its own callback function with a defined signature.

If I have any element ("rtspsrc", "decodebin2" etc) then how can I find out what callbacks are available for that element and what the callback functions are?

Thanks

[Tim-Philipp Müller-2]

On Thu, 2010-03-18 at 06:21 -0800, wanting2learn wrote:

> Look at the following code:
>
> GstElement *source = gst_element_factory_make("rtspsrc", "source");
>
> g_signal_connect(source, "pad-added", G_CALLBACK(on_rtsppad_added),
>                    null );
>
> Now depending on what element I want to make e.g. "rtspsrc" then I can call
> certain callbacks e.g. "pad-added" which will have its own callback function
> with a defined signature.
>
> If I have any element ("rtspsrc", "decodebin2" etc) then how can I find out
> what callbacks are available for that element and what the callback
> functions are?

 gst-inspect-0.10 rtspsrc

shows the properties and signals, and so does the rtspsrc documentation
page linked to from http://gstreamer.freedesktop.org/documentation/
("Overview of all Plug-ins"). In addition to the properties and signals
listed, the usual base class (GstElement, GstObject, GObject) properties
and signals are also available and documented in the GStreamer core/GLib
API reference.

Cheers
 -Tim



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[wanting2learn]

Thank you my friend :)

[wanting2learn]

I notice that there are lots of plug-ins that do not have information about them.

e.g
qtmux Quicktime Muxer plugin
gppmux Multiplex audio and video into a 3GPP file
mj2mux Multiplex audio and video into a MJ2 file
mp4mux Multiplex audio and video into a MP4 file
qtmoovrecover Recovers unfinished qtmux files
qtmux       Multiplex audio and video into a QuickTime file


Why is this??  and how can I find out information about these??

Thanks

[Thiago Sousa Santos-2]

On Thu, Mar 18, 2010 at 11:57 AM, wanting2learn <[hidden email]> wrote:

I notice that there are lots of plug-ins that do not have information about
them.

e.g
qtmux   Quicktime Muxer plugin
gppmux  Multiplex audio and video into a 3GPP file
mj2mux  Multiplex audio and video into a MJ2 file
mp4mux  Multiplex audio and video into a MP4 file
qtmoovrecover   Recovers unfinished qtmux files
qtmux           Multiplex audio and video into a QuickTime file

Those elements have properties listed. The don't have signals/actions. As Tim has said, those elements inherit from GstElement/GObject, so you should check the docs for them to know what signals/actions/properties they might inherit from it.

Example, you can check http://www.gstreamer.net/data/doc/gstreamer/head/gstreamer/html/GstElement.html for GstElement docs.

 

Why is this??  and how can I find out information about these??

Thanks
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--
Thiago Sousa Santos

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