gst-editor updated for Gtk+ 3, GStreamer 1.0 support in progress

[Robin Haberkorn]

Hello,

the gst-editor fork will now load and save pipelines again. This is
based on a serialisation to the GstParse/gst-launch syntax.

It can either save plain pipelines (or copy them to the clipboard)
that can e.g. be directly pasted into a terminal for execution with
`gst-launch`; or you can save pipelines in the special *.GEP
(Gst-Editor Pipeline) format which is basically a plain pipeline with
some meta data for node positioning, wrapped in a GKeyFile. GKeyFiles
are used because they provide just enough structure, are easy to read
and are already part of glib.

The serialization code is here:
https://github.com/metratec/gst-editor/blob/master/libs/gst/common/gste-serialize.c

I deliberately kept this generic, so it can be easily copied/ported
into other applications. External applications may also choose to depend
on the libgsteditor library in order to gain serialization support.

Ghost pads are probably still broken -- I do not need them now.

Currently, you can only load pipelines from *.GEP files. However, I'm
planning to implement loading from plain pipelines as well.
Naturally this will require some automagic positioning of the pipeline
nodes. A useful feature in a graph editor anyway.

Best regards,
Robin

On Wed, 22 Jun 2016 01:07:19 +0200
Robin Haberkorn <haberkorn at metratec.com> wrote:

> Hello again,
> 
> the project is now in a state where it compiles and runs against
> GStreamer 1.0. It survived some basic testing but is far from being
> bug-free.
> 
> Loading and saving pipelines is currently disabled. I will work on
> that as soon as I have evaluated a few more technical aspects.
> 
> Best regards,
> Robin
> 
> On Sat, 18 Jun 2016 02:26:59 +0200
> Robin Haberkorn <haberkorn at metratec.com> wrote:
> 
> > Hello,
> > 
> > I wanted to inform you that I forked the old gst-editor (GStreamer
> > pipeline editor) project:
> > 
> > https://github.com/metratec/gst-editor/
> > 
> > This was forked from the abandoned v0.10.3.2 which was last worked
> > on by Hannes Bistry, supporting Gtk+ 2 and GStreamer 0.10.
> > Originally gst-editor appeared to be a part of the GStreamer
> > project but was eventually dropped.
> > 
> > The goal is to update this project to work with recent Gtk+ 3 and
> > GStreamer 1.0 APIs.
> > 
> > So far, the project builds cleanly on Gtk+ 3 - v3.10.8 at least
> > which is what I use here on Ubuntu 14.04. The old version did not
> > even run properly on Gtk+ v2.24, so that makes the fork interesting
> > already.
> > 
> > It is still stuck at GStreamer 0.10, though. I'm starting to port it
> > to v1.0 APIs now.
> > 
> > There is one major obstacle: GstXML support has been removed in
> > v1.0. Supposedly it never worked properly anyway. Naturally some
> > way of persisting/serializing pipelines would be very helpful.
> > 
> > Do you know of any alternative/replacement that I might use? This
> > could also be code from another project that I would incorporate
> > into the gst-editor code base for the time being.
> > The Pipeviz editor has some XML serialization code, but it is broken
> > as well and could only serve as a reference anyway.
> > 
> > If something like this does not exist, I think I will start working
> > on serialization support for the GstParse (gst-launch) format. The
> > reason is that there is already deserialization support and it is
> > maintained by the community.
> > 
> > Perhaps you might also be interested in maintaining GstParse
> > serialization support as part of upstream. People might find that
> > useful.
> > 
> > I hope that this project will generate some interest in the
> > GStreamer community. A pipeline editor is often asked for. Feel
> > free to take part in its development.
> > 
> > Best regards,
> > Robin
> 
> 
> 



-- 
Robin Haberkorn
Developer

metraTec GmbH
Niels-Bohr-Str. 5
39106 Magdeburg
Germany

haberkorn at metratec.com
www.metratec.com