When writing a GStreamer application, you can simply include gst/gst.h to get access to the library functions. Besides that, you will also need to initialize the GStreamer library.
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 4-1. Initializing GStreamer
#include <stdio.h> #include <gst/gst.h> int main (int argc, char *argv[]) { const gchar *nano_str; guint major, minor, micro, nano; gst_init (&argc, &argv); gst_version (&major, &minor, µ, &nano); if (nano == 1) nano_str = "(CVS)"; else if (nano == 2) nano_str = "(Prerelease)"; else nano_str = ""; printf ("This program is linked against GStreamer %d.%d.%d %s\n", major, minor, micro, nano_str); return 0; }
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. GStreamer currently uses a
scheme where versions with the same major and minor versions are
API-/ and ABI-compatible.
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.
[1] | The code for this example is automatically extracted from the documentation and built under examples/manual in the GStreamer tarball. |