[gst-devel] My First Plugin - Help please

[Zhao Liang-E3423C]

Maybe you don't create pad when init, and just add template into class.

Try to create pad in element init. Example:

  srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
  gst_element_add_pad (GST_ELEMENT (elem), srcpad); 

Zhao Liang

-----Original Message-----
From: Daniel James Laird [mailto:daniel.j.laird at nxp.com] 
Sent: Tuesday, February 03, 2009 9:34 PM
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] My First Plugin - Help please

Thanks that solved it,

I am now busy trying to work out the following debug message:
GStreamer-WARNING **: Element myframedvideo0 has an ALWAYS template sink, but no pad of the same name

Any pointers appreciated!  
But I am now past the initial hurdles, many thanks for the help

Daniel Laird

-----Original Message-----
From: Tim-Philipp Müller [mailto:t.i.m at zen.co.uk]
Sent: 2009 Feb 03 12:28
To: gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-devel] My First Plugin - Help please

On Tue, 2009-02-03 at 13:05 +0100, Daniel James Laird wrote:

> That solved that issue.  The problem now is that it does not show up as a plugin at all.
> using gst-inspect to list plugins.

Try:

 $ GST_DEBUG=*:2 gst-inspect-0.10 /path/to/yourplugin.so

(or *:3 if the above didn't show any warnings).

Make sure the license string in your plugin's GST_PLUGIN_DEFINE() is one of the 'approved' strings (Use "Proprietary" if in doubt).

> I cannot work out when I should use BOILERPLATE_FULL and when I should  
> use GST_PLUGIN_DEFINE and gst_element_register as I cannot get a  
> GST_BOILERPLATE_FULL and GstVideoSink to register.  Am I missing  
> something really obvious? The manual is a bit vague at this point and  
> any help would be appreciated.

You absolutely need the GST_PLUGIN_DEFINE() block. In it you will reference a plugin_init() function, which you also need. In the
plugin_init() function you call gst_element_register() for each element you want to register. In order to do this, you need a GType. You *can* use GST_BOILERPLATE* if you like (it will define a foo_bar_get_type() function for you), but you don't have to if you prefer to do the
_get_type() function yourself.

Cheers
 -Tim



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