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digitalmars.D.learn - GStreamer and D

reply Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
Has anyone got any examples of using GStreamer from D. I found that
GtkD packages a GStreamer API which is great, but there are very few
example codes =E2=80=93 at least that I have found.

--=20
Russel.
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Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Feb 26 2016
parent reply Kagamin <spam here.lot> writes:
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-helloworld.htm
#section-helloworld - Hello world.
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/ma
ual/html/index.html - GStreamer Application Development Manual
http://docs.gstreamer.com/display/GstSDK/Basic+tutorials - Basic 
tutorials.
Feb 26 2016
parent reply Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Fri, 2016-02-26 at 14:40 +0000, Kagamin via Digitalmars-d-learn
wrote:

 https://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html
 /chapter-helloworld.html#section-helloworld - Hello world.
 https://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html
 /index.html - GStreamer Application Development Manual
 http://docs.gstreamer.com/display/GstSDK/Basic+tutorials - Basic=C2=A0
 tutorials.


This is the C documentation, the issue I have is about the D wrapper
and some idiomatic usage examples of it.

--=20
Russel.
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=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Feb 26 2016
parent reply Jay Norwood <jayn prismnet.com> writes:
wow! I hadn't tried this gtkd library before. I was hunting for 
the gstreamer in particular.

The hello_world alsa-sink audio example failed on Windows.  The 
debugger indicates no sink, which I guess is reasonable.

With very little effort, though, I converted the hello_world 
example to generate a video test pattern and use vidoeconvert and 
autovideosink, and that popped up right away on Windows in a 64 
bit build ... so, nice going!

The gstreamer example built without error in msvc 2013 with 
visualD and DMD32 D Compiler v2.073.2
Jun 15 2017
parent reply Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Thu, 2017-06-15 at 19:27 +0000, Jay Norwood via Digitalmars-d-learn
wrote:

 wow! I hadn't tried this gtkd library before. I was hunting for=20
 the gstreamer in particular.


Welcome to the group of people using GStreamer from D. I suspect I may
be the only other member of that club.


 The hello_world alsa-sink audio example failed on Windows.  The=20
 debugger indicates no sink, which I guess is reasonable.


Ah the word Windows. I use only Debian Sid and Fedora Rawhide, with
occasional descent into some ancient version of MacOS (Apple refuse to
upgrade older laptops, some agist excuse ;-) so I can't help with
anything platform specific relating to Windows.=20

Both Debian Sid and Fedora Rawhide have packages for GStreamer and LDC
so installation is very easy.


 With very little effort, though, I converted the hello_world=20
 example to generate a video test pattern and use vidoeconvert and=20
 autovideosink, and that popped up right away on Windows in a 64=20
 bit build ... so, nice going!
=20
 The gstreamer example built without error in msvc 2013 with=20
 visualD and DMD32 D Compiler v2.073.2


DMD is not packaged for Debian, but there is D-Apt so it is available,
or Fedora, so LDC tends to be the "go to" D compiler. I haven't tried
the example codes, but My GStreamer programs in D work nicely.

I am just starting to rewrite Me TV from C++14 to D.

--=20
Russel.
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Jun 15 2017
parent reply Jay Norwood <jayn prismnet.com> writes:
On Friday, 16 June 2017 at 06:45:38 UTC, Russel Winder wrote:

 Welcome to the group of people using GStreamer from D. I 
 suspect I may be the only other member of that club.


Looks like gst-inspect hasn't been ported...  I'm looking at that 
now.
Jun 16 2017
parent reply Russel Winder via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:
On Fri, 2017-06-16 at 16:11 +0000, Jay Norwood via Digitalmars-d-learn
wrote:

 On Friday, 16 June 2017 at 06:45:38 UTC, Russel Winder wrote:

 Welcome to the group of people using GStreamer from D. I=20
 suspect I may be the only other member of that club.


=20
 Looks like gst-inspect hasn't been ported...  I'm looking at that=20
 now.


gst-inspect-1.0 is an executable that comes with the installation,
however that is done. What are you thinking of when saying "ported"?

--=20
Russel.
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=3D=3D
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder ekiga.n=
et
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
Jun 16 2017
parent reply Jay Norwood <jayn prismnet.com> writes:
On Friday, 16 June 2017 at 16:33:56 UTC, Russel Winder wrote:


 gst-inspect-1.0 is an executable that comes with the 
 installation, however that is done. What are you thinking of 
 when saying "ported"?


gst-inspect is a good demonstration of iteration through the 
available gstreamer elements and their options. I want to modify 
that code to generate a model that could be used for persisting a 
pipeline configuration.
https://github.com/GStreamer/gstreamer/blob/master/tools/gst-inspect.c

So far, I've looked up about 80 calls used in that program, and 
only these few don't have c aliases in the d interfaces.  I 
haven't looked to see if these are macros, or perhaps I could be 
looking at an incompatible version of gst-inspect.c.  Anyway, 
looks pretty good so far.

gst_plugin_feature_get_name
g_list_next
g_return_if_fail
g_value_get_boolean
Jun 16 2017
parent Mike Wey <mike-wey example.com> writes:
On 06/17/2017 01:34 AM, Jay Norwood wrote:

 gst_plugin_feature_get_name


This is a macro, the alternative:

```
import gobject.Value;

Value name;
feature.getProperty("name", name);
name.getString();
```

or if you don't want to use GValue.

```
to!string((cast(GstObject)feature.getPluginFeatureStruct()).name);
```


 g_list_next


https://github.com/gtkd-developers/GtkD/blob/master/generated/gtkd/glib/ListG.d#L75


 g_return_if_fail


Also a macro, witch basically does this:

```
if ( !expression )
	return;
```


 g_value_get_boolean


https://github.com/gtkd-developers/GtkD/blob/master/generated/gtkd/gobject/Value.d#L245

-- 
Mike Wey
Jun 17 2017