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Another incremental piece of work on the PWG.

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Original commit message from CVS:
Another incremental piece of work on the PWG.
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Richard Boulton 2001-03-18 14:41:39 +00:00
parent 20c90565e1
commit 22c6305b00
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82
docs/fwg/gst-plugin-writers-guide.sgml
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@ -544,9 +544,73 @@
<para>
A new element is defined by creating an element factory. This is a
structure containing all the information needed to create an instance
of the element.
of the element. Creating a factory requires two things: a type for
the element to be created
(this was defined in the boilerplate above: FIXME - reorganise),
and a GstElementDetails structure, which contains some
general information about the element to be created.
</para>
<sect1 id="sect-defineelt-eltdetails">
<title>GstElementDetails</title>
<para>
The GstElementDetails structure gives a heirarchical type for
the element, a human-readable description of the element, as
well as author and version data. The entries are:
</para>
<itemizedlist>
<listitem><para>
A long, english, name for the element.
</para></listitem><listitem><para>
The type of the element, as a heirarchy. The heirarchy is defined
by specifying the top level category, followed by a "/", followed
by the next level category, etc. The type should be defined
according to the guidelines elsewhere in this document.
(FIXME: write the guidelines, and give a better reference to them)
</para></listitem><listitem><para>
A brief description of the purpose of the element.
</para></listitem><listitem><para>
The version number of the element. For elements in the main
GStreamer source code, this will often simply be VERSION, which is
a macro defined to be the version number of the current GStreamer
version. The only requirement, however, is that the version
number should increase monotonically.
</para><para>
Version numbers should be stored in major.minor.patch form: ie, 3
(decimal) numbers, separated by ".".
</para></listitem><listitem><para>
The name of the author of the element, optionally followed by
a contact email address in angle brackets.
</para></listitem><listitem><para>
The copyright details for the element.
</para></listitem>
</itemizedlist>
<para>
For example:
</para>
<programlisting>
static GstElementDetails example_details = {
"An example plugin",
"Example/FirstExample",
"Shows the basic structure of a plugin",
VERSION,
"your name &lt;your.name@your.isp&gt;",
"(C) 2001",
};
</programlisting>
</sect1>
<sect1 id="sect-defineelt-constructors">
<title>Constructor functions</title>
<para>
Each element has two functions which are used for construction of
an element. These are the _class_init() function, which is used to
initialise the class (specifying what signals and arguments the class
has and setting up global state), and the _init() function, which
is used to initialise a specific instance of the class.
</para>
</sect1>
<sect1 id="sect-defineelt-pads">
<title>Specifying the pads</title>
<para>
@ -564,6 +628,22 @@
<para>
</para>
</sect1>
<sect1 id="sect-defineelt-arguments">
<title>Adding arguments</title>
<para>
Define arguments in enum.
</para>
</sect1>
<sect1 id="sect-defineelt-signals">
<title>Signals</title>
<para>
Define signals in enum.
</para>
</sect1>
</chapter>
<chapter id="cha-definetype">