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83 lines
2.9 KiB
XML
83 lines
2.9 KiB
XML
<chapter id="cha-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 would start like this:
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</para>
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<programlisting>
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#include <gst/gst.h>
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...
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int
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main (int argc, char *argv[])
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{
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...
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gst_init (&argc, &argv);
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...
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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 parsed by <application>GStreamer</application>.
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</para>
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<para>
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Use the GST_VERSION_MAJOR, GST_VERSION_MINOR and GST_VERSION_MICRO macros to
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get the <application>GStreamer</application> version you are building against or
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use gst_version() to get the version you are linked against.
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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 next code fragment:
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</para>
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<programlisting>
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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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...
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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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