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Original commit message from CVS: * docs/manual/appendix-integration.xml: * docs/manual/basics-init.xml: Call g_thread_init() before g_option_context_new() to avoid warnings. Spotted by Ritesh Khadgaray. Fixes #484225.
214 lines
8.2 KiB
XML
214 lines
8.2 KiB
XML
<chapter id="chapter-intgration">
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<title>Integration</title>
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<para>
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&GStreamer; tries to integrate closely with operating systems (such
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as Linux and UNIX-like operating systems, OS X or Windows) and desktop
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environments (such as GNOME or KDE). In this chapter, we'll mention
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some specific techniques to integrate your application with your
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operating system or desktop environment of choice.
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</para>
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<sect1 id="section-integration-nix">
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<title>Linux and UNIX-like operating systems</title>
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<para>
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&GStreamer; provides a basic set of elements that are useful when
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integrating with Linux or a UNIX-like operating system.
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</para>
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<itemizedlist>
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<listitem>
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<para>
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For audio input and output, &GStreamer; provides input and
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output elements for several audio subsystems. Amongst others,
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&GStreamer; includes elements for ALSA (alsasrc, alsamixer,
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alsasink), OSS (osssrc, ossmixer, osssink) and Sun audio
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(sunaudiosrc, sunaudiomixer, sunaudiosink).
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</para>
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</listitem>
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<listitem>
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<para>
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For video input, &GStreamer; contains source elements for
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Video4linux (v4lsrc, v4lmjpegsrc, v4lelement and v4lmjpegisnk)
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and Video4linux2 (v4l2src, v4l2element).
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</para>
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</listitem>
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<listitem>
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<para>
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For video output, &GStreamer; provides elements for output
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to X-windows (ximagesink), Xv-windows (xvimagesink; for
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hardware-accelerated video), direct-framebuffer (dfbimagesink)
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and openGL image contexts (glsink).
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</para>
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</listitem>
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</itemizedlist>
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</sect1>
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<sect1 id="section-integration-gnome">
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<title>GNOME desktop</title>
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<para>
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&GStreamer; has been the media backend of the <ulink type="http"
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url="http://www.gnome.org/">GNOME</ulink> desktop since GNOME-2.2
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onwards. Nowadays, a whole bunch of GNOME applications make use of
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&GStreamer; for media-processing, including (but not limited to)
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<ulink type="http" url="http://www.rhythmbox.org/">Rhythmbox</ulink>,
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<ulink type="http" url="http://www.hadess.net/totem.php3">Totem</ulink>
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and <ulink type="http"
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url="http://www.burtonini.com/blog/computers/sound-juicer">Sound
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Juicer</ulink>.
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</para>
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<para>
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Most of these GNOME applications make use of some specific techniques
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to integrate as closely as possible with the GNOME desktop:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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GNOME applications call <function>gnome_program_init ()</function>
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to parse command-line options and initialize the necessary gnome
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modules. &GStreamer; applications would normally call
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<function>gst_init ()</function> to do the same for GStreamer.
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This would mean that only one of the two can parse command-line
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options. To work around this issue, &GStreamer; can provide a
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GLib <classname>GOptionGroup</classname> which can be passed to
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<function>gnome_program_init ()</function>. The following
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example requires Gnome-2.14 or newer (previous libgnome versions
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do not support command line parsing via GOption yet but use the
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now deprecated popt)
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</para>
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<programlisting><!-- example-begin gnome.c a -->
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#include <gnome.h>
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#include <gst/gst.h>
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static gchar **cmd_filenames = NULL;
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static GOptionEntries cmd_options[] = {
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/* here you can add command line options for your application. Check
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* the GOption section in the GLib API reference for a more elaborate
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* example of how to add your own command line options here */
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/* at the end we have a special option that collects all remaining
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* command line arguments (like filenames) for us. If you don'
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* need this, you can safely remove it */
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{ G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &cmd_filenames,
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"Special option that collects any remaining arguments for us" },
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/* mark the end of the options array with a NULL option */
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{ NULL, }
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};
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/* this should usually be defined in your config.h */
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#define VERSION "0.0.1"
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gint
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main (gint argc, gchar **argv)
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{
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GOptionContext *context;
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GOptionGroup *gstreamer_group;
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GnomeProgram *program;
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/* we must initialise the threading system before using any
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* other GLib funtion, such as g_option_context_new() */
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if (!g_thread_supported ())
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g_thread_init (NULL);
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context = g_option_context_new ("gnome-demo-app");
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/* get command line options from GStreamer and add them to the group */
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gstreamer_group = gst_init_get_option_group ();
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g_option_context_add_group (context, gstreamer_group);
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/* add our own options. If you are using gettext for translation of your
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* strings, use GETTEXT_PACKAGE here instead of NULL */
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g_option_context_add_main_entries (context, cmd_options, NULL);
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program = gnome_program_init ("gnome-demo-app", VERSION
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LIBGNOMEUI_MODULE, argc, argv,
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GNOME_PARAM_HUMAN_READABLE_NAME, "Gnome Demo",
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GNOME_PARAM_GOPTION_CONTEXT, context,
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NULL);
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/* any filenames we got passed on the command line? parse them! */
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if (cmd_filenames != NULL) {
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guint i, num;
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num = g_strv_length (cmd_filenames);
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for (i = 0; i < num; ++i) {
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/* do something with the filename ... */
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g_print ("Adding to play queue: %s\n", cmd_filenames[i]);
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}
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g_strfreev (cmd_filenames);
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cmd_filenames = NULL;
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}
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<!-- example-end gnome.c a -->
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[..]<!-- example-begin gnome.c b --><!--
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return 0;
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--><!-- example-end gnome.c b -->
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<!-- example-begin gnome.c c -->
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}
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<!-- example-end gnome.c c --></programlisting>
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</listitem>
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<listitem>
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<para>
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GNOME stores the default video and audio sources and sinks in GConf.
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&GStreamer; provides a number of elements that create audio and
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video sources and sinks directly based on those GConf settings.
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Those elements are: gconfaudiosink, gconfvideosink, gconfaudiosrc
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and gconfvideosrc. You can create them with
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<function>gst_element_factory_make ()</function> and use them
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directly just like you would use any other source or sink element.
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All GNOME applications are recommended to use those elements.
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</para>
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</listitem>
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<listitem>
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<para>
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&GStreamer; provides data input/output elements for use with the
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GNOME-VFS system. These elements are called <quote>gnomevfssrc</quote>
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and <quote>gnomevfssink</quote>.
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</para>
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</listitem>
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</itemizedlist>
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</sect1>
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<sect1 id="section-integration-kde">
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<title>KDE desktop</title>
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<para>
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&GStreamer; has been proposed for inclusion in KDE-4.0. Currently,
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&GStreamer; is included as an optional component, and it's used by
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several KDE applications, including <ulink type="http"
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url="http://amarok.kde.org/">AmaroK</ulink>, <ulink type="http"
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url="http://developer.kde.org/~wheeler/juk.html">JuK</ulink>,
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<ulink type="http"
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url="http://www.xs4all.nl/~jjvrieze/kmplayer.html">KMPlayer</ulink> and
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<ulink type="http"
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url="http://kaffeine.sourceforge.net/">Kaffeine</ulink>.
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</para>
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<para>
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Although not yet as complete as the GNOME integration bits, there
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are already some KDE integration specifics available. This list will
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probably grow as &GStreamer; starts to be used in KDE-4.0:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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AmaroK contains a kiosrc element, which is a source element that
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integrates with the KDE VFS subsystem KIO.
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</para>
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</listitem>
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</itemizedlist>
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</sect1>
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<sect1 id="section-integration-osx">
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<title>OS X</title>
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<para>
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&GStreamer; provides native video and audio output elements for OS X.
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It builds using the standard development tools for OS X.
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</para>
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</sect1>
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<sect1 id="section-integration-win32">
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<title>Windows</title>
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<para>
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&GStreamer; builds using Microsoft Visual C .NET 2003 and using Cygwin.
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</para>
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</sect1>
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</chapter>
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