Initializing <application>GStreamer</application>
When writing a GStreamer application, you can
simply include to get
access to the library functions.
Before the GStreamer libraries can be used,
gst_init 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.
A typical program
&EXAFOOT;
would have code to initialize GStreamer that
looks like this:
int
main (int argc, char *argv[])
{
guint major, minor, micro;
gst_init (&argc, &argv);
gst_version (&major, &minor, µ);
printf ("This program is linked against GStreamer %d.%d.%d\n",
major, minor, micro);
return 0;
}
/* example-end init.c */
]]>
Use the GST_VERSION_MAJOR,
GST_VERSION_MINOR and GST_VERSION_MICRO
macros to get the GStreamer version you are
building against, or use the function gst_version
to get the version your application is linked against.
It is also possible to call the gst_init function
with two NULL arguments, in which case no command line
options will be parsed by GStreamer.
The popt interface
You can also use a popt table to initialize your own parameters as shown in the
next example:
/* example-begin popt.c */
#include <gst/gst.h>
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);
printf ("Run me with --help to see the Application options appended.\n");
return 0;
}
/* example-end popt.c */
As shown in this fragment, you can use a popt table to define your application-specific
command line options, and pass this table to the
function gst_init_with_popt_table. Your
application options will be parsed in addition to the standard
GStreamer options.