Re: libseed-list Digest, Vol 5, Issue 7

[Alan Knowles <alan akbkhome com>]

This is a working version - it plays an mp3 quite nicely

http://www.akbkhome.com/svn/seed/seedbugs/gst_59537.js

The biggest change to the code is that the uri has to be in the format
file:/tmp/test.mp3


Note there are a few changes to seed and gir required (to handle the 
messaging / error reporting)

These are:

a) seed_gi_argument_make_js - handle error types (and throw an excpetion) -
Not sure if this is the best behaviour, as in the gst example, it get 
called from the msg.parse_error() call..

case GI_TYPE_TAG_ERROR:
   seed_make_exception_from_gerror (ctx, exception, (GError*) 
arg->v_pointer);
   return false;

b) parse_error signature should look like this.
* note that gerror and debug are both 'out' arguments.
* the gchar** is defined as an array in my gir file - it's modified to a 
standard type.

<method name="parse_error"
             c:identifier="gst_message_parse_error"
             doc="Extracts the GError and debug string from the 
GstMessage. The values returned
in the output arguments are copies; the caller must free them when done.
MT safe.">
       <return-value transfer-ownership="none">
         <type name="none" c:type="void"/>
       </return-value>
       <parameters>
         <parameter name="gerror"  direction="out" 
transfer-ownership="full">
           <type name="GLib.Error" c:type="GError**"/>
         </parameter>
         <parameter name="debug" direction="out"  
transfer-ownership="full">
             <type name="utf8" c:type="gchar**"/>
         </parameter>
       </parameters>
     </method>

Regards
Alan


Alan Forbes wrote:
> Hi Alan
>
> I wouldn't worry too much about this especially if you've got more
> important things to look at. 
>
>
> On Fri, 2010-02-19 at 09:05 +0800, Alan Knowles wrote:
>   
> > I'll try and have another go at looking at this, It took me a while to 
> > dig through the source to gather that the GObject does not use the 
> > introspection calls, rather it's a base class defined in seed.
> >
> > Regards
> > Alan
> >
> >
> > Alan Forbes wrote:
> >     
> > > I took the uri I used with the C example which successfully played a
> > > music mp3 files as well as the below code line and added it to the
> > > program that still did not work i.e. there was no music coming from
> > > speakers.
> > >
> > > It may mean there could be a problem with the playbin/playbin factory
> > > element rather than uri handling? I don't mean this to be a criticism
> > > but the gstreamer framework is a bit complicated for doing simple tasks
> > > like playing media files so I am going to print out the GObject & G
> > > GStreamer reference manuals and study them rather than my usual approach
> > > of jumping in at the deep end and tinkering with the code until I get it
> > > (which I think will be quicker!!) 
> > >
> > >   
> > >       
> > > > properties are supported by setter/getter hooks.
> > > >
> > > > eg.
> > > >
> > > > pipeline.uri = url
> > > >
> > > > is equivilant to
> > > >
> > > > g_object_set_property("uri", gvalue_of_url)
> > > >
> > > > Regards
> > > > Alan
> > > >     
> > > >         
> > > _______________________________________________
> > > libseed-list mailing list
> > > libseed-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/libseed-list
> > >   
> > >       
>
>
>