Functions returning glib::types:Type (aka GType)

[Russel Winder]

Hi,

Many of the types in the MPEG-TS library have an associated _get_type
function, for example gst_mpegts_section_get_type. Doing a grep on the
GStreamer source, I see some usages of these functions and I see declarations
of the functions, but I do not see any definitions of the functions. Where are
the definitions of these functions?

--
Russel.
===========================================
Dr Russel Winder      t: [phone]
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London SW11 1EN, UK   w: www.russel.org.uk


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[Sebastian Dröge-3]

On Mon, 2019-05-20 at 15:41 +0100, Russel Winder wrote:
> Hi,
>
> Many of the types in the MPEG-TS library have an associated _get_type
> function, for example gst_mpegts_section_get_type. Doing a grep on the
> GStreamer source, I see some usages of these functions and I see declarations
> of the functions, but I do not see any definitions of the functions. Where are
> the definitions of these functions?

From the G_DEFINE_BOXED_TYPE macro, G_DEFINE_TYPE, etc.

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Sebastian Dröge, Centricular Ltd · https://www.centricular.com


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[Russel Winder]

On Mon, 2019-05-20 at 18:13 +0300, Sebastian Dröge wrote:

> On Mon, 2019-05-20 at 15:41 +0100, Russel Winder wrote:
> > Hi,
> >
> > Many of the types in the MPEG-TS library have an associated _get_type
> > function, for example gst_mpegts_section_get_type. Doing a grep on the
> > GStreamer source, I see some usages of these functions and I see
> > declarations
> > of the functions, but I do not see any definitions of the functions. Where
> > are
> > the definitions of these functions?
>
> From the G_DEFINE_BOXED_TYPE macro, G_DEFINE_TYPE, etc.

Curses, I had forgotten that – and I was working with them last November!

I think enums must be treated differently to structs. In particular the audio
library has an enum AudioChannelPosition and there is a function
gst_audio_channel_position_get_type. However I cannot find any G_DEFINE…
applied to AudioChannelPosition in the GStreamer source. Hopefully this is
just a problem with my use of grep.

--
Russel.
===========================================
Dr Russel Winder      t: [phone]
41 Buckmaster Road    m: [phone]
London SW11 1EN, UK   w: www.russel.org.uk


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[Sebastian Dröge-3]

On Mon, 2019-05-20 at 17:05 +0100, Russel Winder wrote:
>
> I think enums must be treated differently to structs. In particular the audio
> library has an enum AudioChannelPosition and there is a function
> gst_audio_channel_position_get_type. However I cannot find any G_DEFINE…
> applied to AudioChannelPosition in the GStreamer source. Hopefully this is
> just a problem with my use of grep.

g_enum_register_static(), which is usually called from autogenerated
(via glib-mkenums) files.

--
Sebastian Dröge, Centricular Ltd · https://www.centricular.com


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