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Original commit message from CVS: * docs/Makefile.am: * docs/manual/elements-api.xml: restructure so that common stuff is shown first * docs/manual/init-api.xml: convert to examples * docs/manual/manual.xml: * docs/manuals.mak: * docs/url.entities: link to API on the website, possibly override later in build * examples/manual/.cvsignore: ignore more * examples/manual/Makefile.am: add more examples * examples/manual/extract.pl: error out on failure
99 lines
3.1 KiB
XML
99 lines
3.1 KiB
XML
<chapter id="chapter-initialisation">
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<title>Initializing <application>GStreamer</application></title>
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<para>
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When writing a <application>GStreamer</application> application, you can
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simply include <filename class='headerfile'>gst/gst.h</filename> to get
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access to the library functions.
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</para>
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<para>
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Before the <application>GStreamer</application> libraries can be used,
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<function>gst_init</function> has to be called from the main application.
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This call will perform the necessary initialization of the library as
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well as parse the GStreamer-specific command line options.
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</para>
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<para>
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A typical program
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&EXAFOOT;
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would have code to initialize GStreamer that
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looks like this:
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</para>
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<programlisting>
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<![CDATA[
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/* example-begin init.c */
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#include <gst/gst.h>
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int
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main (int argc, char *argv[])
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{
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guint major, minor, micro;
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gst_init (&argc, &argv);
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gst_version (&major, &minor, &micro);
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printf ("This program is linked against GStreamer %d.%d.%d\n",
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major, minor, micro);
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return 0;
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}
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/* example-end init.c */
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]]>
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</programlisting>
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<para>
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Use the <symbol>GST_VERSION_MAJOR</symbol>,
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<symbol>GST_VERSION_MINOR</symbol> and <symbol>GST_VERSION_MICRO</symbol>
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macros to get the <application>GStreamer</application> version you are
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building against, or use the function <function>gst_version</function>
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to get the version your application is linked against.
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<!-- FIXME: include an automatically generated list of these options. -->
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</para>
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<para>
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It is also possible to call the <function>gst_init</function> function
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with two <symbol>NULL</symbol> arguments, in which case no command line
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options will be parsed by <application>GStreamer</application>.
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</para>
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<sect1>
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<title>The popt interface</title>
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<para>
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You can also use a popt table to initialize your own parameters as shown in the
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next example:
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</para>
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<programlisting>
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/* example-begin popt.c */
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#include <gst/gst.h>
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int
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main(int argc, char *argv[])
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{
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gboolean silent = FALSE;
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gchar *savefile = NULL;
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struct poptOption options[] = {
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{"silent", 's', POPT_ARG_NONE|POPT_ARGFLAG_STRIP, &silent, 0,
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"do not output status information", NULL},
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{"output", 'o', POPT_ARG_STRING|POPT_ARGFLAG_STRIP, &savefile, 0,
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"save xml representation of pipeline to FILE and exit", "FILE"},
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POPT_TABLEEND
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};
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gst_init_with_popt_table (&argc, &argv, options);
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printf ("Run me with --help to see the Application options appended.\n");
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return 0;
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}
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/* example-end popt.c */
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</programlisting>
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<para>
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As shown in this fragment, you can use a <ulink
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url="http://developer.gnome.org/doc/guides/popt/"
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type="http">popt</ulink> table to define your application-specific
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command line options, and pass this table to the
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function <function>gst_init_with_popt_table</function>. Your
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application options will be parsed in addition to the standard
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<application>GStreamer</application> options.
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</para>
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</sect1>
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</chapter>
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