<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML
><HEAD
><TITLE
>Initializing GStreamer</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
REL="HOME"
TITLE="GStreamer Application Development Manual"
HREF="index.html"><LINK
REL="UP"
TITLE="Basic API"
HREF="part-basic-api.html"><LINK
REL="PREVIOUS"
TITLE="Basic API"
HREF="part-basic-api.html"><LINK
REL="NEXT"
TITLE="Elements"
HREF="chapter-elements-api.html"></HEAD
><BODY
CLASS="chapter"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
><SPAN
CLASS="application"
>GStreamer</SPAN
> Application Development Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="part-basic-api.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="chapter-elements-api.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="chapter"
><H1
><A
NAME="chapter-initialisation"
></A
>Chapter 11. Initializing <SPAN
CLASS="application"
>GStreamer</SPAN
></H1
><P
>
When writing a <SPAN
CLASS="application"
>GStreamer</SPAN
> application, you can
simply include <TT
CLASS="filename"
>gst/gst.h</TT
> to get
access to the library functions.
</P
><P
>
Before the <SPAN
CLASS="application"
>GStreamer</SPAN
> libraries can be used,
<CODE
CLASS="function"
>gst_init</CODE
> has to be called from the main application.
This call will perform the necessary initialization of the library as
well as parse the GStreamer-specific command line options.
</P
><P
>
A typical program would start like this:
</P
><PRE
CLASS="programlisting"
> #include <gst/gst.h>
...
int
main (int argc, char *argv[])
{
...
gst_init (&argc, &argv);
...
}
</PRE
><P
> Use the <VAR
CLASS="symbol"
>GST_VERSION_MAJOR</VAR
>,
<VAR
CLASS="symbol"
>GST_VERSION_MINOR</VAR
> and <VAR
CLASS="symbol"
>GST_VERSION_MICRO</VAR
>
macros to get the <SPAN
CLASS="application"
>GStreamer</SPAN
> version you are
building against, or use the function <CODE
CLASS="function"
>gst_version</CODE
>
to get the version your application is linked against.
</P
><P
> It is also possible to call the <CODE
CLASS="function"
>gst_init</CODE
> function
with two <VAR
CLASS="symbol"
>NULL</VAR
> arguments, in which case no command line
options will parsed by <SPAN
CLASS="application"
>GStreamer</SPAN
>.
</P
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="AEN415"
>11.1. The popt interface</A
></H1
><P
> You can also use a popt table to initialize your own parameters as shown in the next code fragment:
</P
><PRE
CLASS="programlisting"
> int
main(int argc, char *argv[])
{
gboolean silent = FALSE;
gchar *savefile = NULL;
struct poptOption options[] = {
{"silent", 's', POPT_ARG_NONE|POPT_ARGFLAG_STRIP, &silent, 0,
"do not output status information", NULL},
{"output", 'o', POPT_ARG_STRING|POPT_ARGFLAG_STRIP, &savefile, 0,
"save xml representation of pipeline to FILE and exit", "FILE"},
POPT_TABLEEND
};
gst_init_with_popt_table (&argc, &argv, options);
...
</PRE
><P
> As shown in this fragment, you can use a <A
HREF="http://developer.gnome.org/doc/guides/popt/"
TARGET="_top"
>popt</A
> table to define your application-specific
command line options, and pass this table to the
function <CODE
CLASS="function"
>gst_init_with_popt_table</CODE
>. Your
application options will be parsed in addition to the standard
<SPAN
CLASS="application"
>GStreamer</SPAN
> options.
</P
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="part-basic-api.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="chapter-elements-api.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Basic API</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="part-basic-api.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Elements</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
