| GStreamer Application Development Manual (0.8.7) | ||
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When writing a GStreamer application, you can simply include gst/gst.h 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 [1] would have code to initialize GStreamer that looks like this:
/* example-begin init.c */
#include <gst/gst.h>
int
main (int argc, char *argv[])
{
guint major, minor, micro;
gst_init (&argc, &argv);
gst_version (&major, &minor, &micro);
printf ("This program is linked against GStreamer %d.%d.%d\n",
major, minor, micro);
return 0;
}
/* example-end init.c */
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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.
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 */
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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.
| [1] | The code for this example is automatically extracted from the documentation and built under examples/manual in the GStreamer tarball. |
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