[gst-devel] GStreamer as Mozilla plugin

[Steve Crouse]

Thanks for the reply Wim,

    Passing null pointers to gst_init() seems to have done the trick for my
first problem. But the second problem doesn't seem to want to go away. After
running gstreamer-register I now get:

    ./mozilla-bin: error in loading shared libraries:
/usr/local/lib/gst/libmp3parse.so: undefined symbol: gst_plugin_new

    Instead of:

    ./mozilla-bin: error in loading shared libraries:
/usr/local/lib/gst/libgsttypes.so: undefined symbol: gst_plugin_new

    I modified my LD_LIBRARY_PATH environment variable as Laurent Lacaze
suggested with no luck.


    I also now get:

    ** CRITICAL **: file gstelementfactory.c: line 155
(gst_elementfactory_create): assertion `factory != NULL' failed.

    Gtk-WARNING **: invalid cast from (NULL) pointer to `GtkObject'

    Gtk-CRITICAL **: file gtkobject.c: line 726 (gtk_object_set): assertion
`object != NULL' failed.

    Gtk-WARNING **: invalid cast from (NULL) pointer to `GtkObject'

    Gtk-CRITICAL **: file gtksignal.c: line 724 (gtk_signal_connect):
assertion `object != NULL' failed.

    When it tries to create the disk reader.

    Anyone have any ideas?

Steve Crouse


Wim Taymans wrote:

> Hello,
>
> >sss I'm attempting to write a plugin for Mozilla that uses GStreamer to
> > play audio and video files. I should have the basics of my plugin
> > working except for a couple issues. The first thing I want to be able to
>
> wow cool!
>
> > do is simply play an mp3 using the plugin, so I based my code on the
> > helloworld sample included with the GStreamer distribution. Here are the
> > problems I am having:
>
> > - The call to gst_init() requires argc and argv. Since I am in a plugin
> > I don't have a main() function so I just created my own argc and argv:
> >
> >ssssss int argc = 2;
> >sssssss char *argv[] = { "test", "test" };
> >
> >sssssss gst_init( &argc, &argv );
> >
> >sss This causes a compile error
> >
> >sssssssssss passing `char ** (*)[2]' as argument 2 of `gst_init(int *,
> >char ***)'
> >
> >sss I got around this with a cast to make it compile but I'm sure that
> > will come back and bite me in the ass later.
>
> you can safely pass two NULL pointers to the gst_init function.
>
> >- Once I've got things compiling when I run the plugin I get
> >
> >sssssss ** WARNING **: gstplugin: registry needs rebuild
>
> running gstreamer-register will fix this warning. It will create an
> XML registry of all the available plugins, this is both faster and
> avoids some symbol conflicts.
>
> >sssssss ./mozilla-bin: error in loading shared libraries:
> > /usr/local/lib/gst/libgsttypes.so: undefined symbol: gst_plugin_new
>
> it looks like the libgst.so library is not loaded. Did you verify that you
> link your plugin against libgst.so since this is where the symbol ought to
> be defined?
>
> >sss I think once these two issues are worked out I should (knock on
> > wood) be able to play an mp3 using the plugin. So if anyone reading this
> > knows the solution to either or both of the above problems please let me
> > know.
> >
> > Thanks,
> >
> > Steve Crouse
>
> Wim Taymans
>
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