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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Examining the Basic Code</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="GStreamer Plugin Writer's Guide (1.8.0)"><link rel="up" href="chapter-building-boiler.html" title="Chapter 3. Constructing the Boilerplate"><link rel="prev" href="section-boiler-project-stamp.html" title="Using the Project Stamp"><link rel="next" href="section-boiler-details.html" title="Element metadata"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Examining the Basic Code</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="section-boiler-project-stamp.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Constructing the Boilerplate</th><td width="20%" align="right"> <a accesskey="n" href="section-boiler-details.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="section-boiler-examine"></a>Examining the Basic Code</h2></div></div></div><p>
First we will examine the code you would be likely to place in a header
file (although since the interface to the code is entirely defined by the
plugin system, and doesn't depend on reading a header file, this is not
crucial.)
The code here can be found in
<code class="filename">examples/pwg/examplefilter/boiler/gstexamplefilter.h</code>.
</p><div class="example"><a name="ex-boiler-examine-h"></a><p class="title"><b>Example 3.1. Example Plugin Header File</b></p><div class="example-contents"><pre class="programlisting">
#include <gst/gst.h>
/* Definition of structure storing data for this element. */
typedef struct _GstMyFilter {
GstElement element;
GstPad *sinkpad, *srcpad;
gboolean silent;
} GstMyFilter;
/* Standard definition defining a class for this element. */
typedef struct _GstMyFilterClass {
GstElementClass parent_class;
} GstMyFilterClass;
/* Standard macros for defining types for this element. */
#define GST_TYPE_MY_FILTER (gst_my_filter_get_type())
#define GST_MY_FILTER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MY_FILTER,GstMyFilter))
#define GST_MY_FILTER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MY_FILTER,GstMyFilterClass))
#define GST_IS_MY_FILTER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MY_FILTER))
#define GST_IS_MY_FILTER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MY_FILTER))
/* Standard function returning type information. */
GType gst_my_filter_get_type (void);
</pre></div></div><br class="example-break"><p>
Using this header file, you can use the following macro to setup
the <code class="classname">GObject</code> basics in your source file so
that all functions will be called appropriately:
</p><pre class="programlisting">
#include "filter.h"
G_DEFINE_TYPE (GstMyFilter, gst_my_filter, GST_TYPE_ELEMENT);
</pre></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="section-boiler-project-stamp.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="chapter-building-boiler.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="section-boiler-details.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Using the Project Stamp </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Element metadata</td></tr></table></div></body></html>
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