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335 lines
14 KiB
XML
335 lines
14 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,
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alsasink), OSS (osssrc, osssink) Pulesaudio (pulsesrc, pulsesink)
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and Sun audio (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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Video4linux2 (v4l2src, v4l2element, v4l2sink).
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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 usually call <function>gtk_init ()</function>
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to parse command-line options and initialize GTK. &GStreamer;
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applications would normally call <function>gst_init ()</function>
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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 GTK 2.6 or newer (previous GTK versions
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do not support command line parsing via GOption yet)
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</para>
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<programlisting><!-- example-begin gnome.c a -->
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#include <gtk/gtk.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't
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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, *gtk_group;
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GError *err = NULL;
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context = g_option_context_new ("gtk-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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gtk_group = gtk_get_option_group (TRUE);
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g_option_context_add_group (context, gtk_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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/* now parse the commandline options, note that this already
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* calls gtk_init() and gst_init() */
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if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
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g_print ("Error initializing: %s\n", err->message);
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exit (1);
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}
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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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GIO VFS system. These elements are called <quote>giosrc</quote>
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and <quote>giosink</quote>.
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The deprecated GNOME-VFS system is supported too but shouldn't be
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used for any new applications.
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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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<warning>
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<para>
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Note: this section is out of date. GStreamer-1.0 has much better
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support for win32 than previous versions though and should usually compile
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and work out-of-the-box both using MSYS/MinGW or Microsoft compilers. The
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<ulink url="http://gstreamer.freedesktop.org">GStreamer web site</ulink> and the
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<ulink url="http://news.gmane.org/gmane.comp.video.gstreamer.devel">mailing list
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archives</ulink> are a good place to check the latest win32-related news.
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</para>
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</warning>
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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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<sect2 id="section-win32-build">
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<title>Building <application>GStreamer</application> under Win32</title>
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<para>There are different makefiles that can be used to build GStreamer with the usual Microsoft
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compiling tools.</para>
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<para>The Makefile is meant to be used with the GNU make program and the free
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version of the Microsoft compiler (<ulink url="http://msdn.microsoft.com/visualc/vctoolkit2003/">http://msdn.microsoft.com/visualc/vctoolkit2003/</ulink>). You also
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have to modify your system environment variables to use it from the command-line. You will also
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need a working Platform SDK for Windows that is available for free from Microsoft.</para>
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<para>The projects/makefiles will generate automatically some source files needed to compile
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GStreamer. That requires that you have installed on your system some GNU tools and that they are
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available in your system PATH.</para>
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<para>The GStreamer project depends on other libraries, namely :</para>
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<itemizedlist>
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<listitem><para>GLib</para></listitem>
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<listitem><para>libxml2</para></listitem>
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<listitem><para>libintl</para></listitem>
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<listitem><para>libiconv</para></listitem>
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</itemizedlist>
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<para>Work is being done to provide pre-compiled GStreamer-1.0 libraries as
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a packages for win32. Check the <ulink url="http://gstreamer.freedesktop.org">
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GStreamer web site</ulink> and check our
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<ulink url="http://news.gmane.org/gmane.comp.video.gstreamer.devel">mailing list
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</ulink> for the latest developments in this respect.</para>
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<note>
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<title>Notes</title>
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<para>GNU tools needed that you can find on <ulink url="http://gnuwin32.sourceforge.net/">http://gnuwin32.sourceforge.net/</ulink></para>
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<itemizedlist>
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<listitem><para>GNU flex (tested with 2.5.4)</para></listitem>
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<listitem><para>GNU bison (tested with 1.35)</para></listitem>
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</itemizedlist>
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<para>and <ulink url="http://www.mingw.org/">http://www.mingw.org/</ulink></para>
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<itemizedlist>
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<listitem><para>GNU make (tested with 3.80)</para></listitem>
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</itemizedlist>
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<para>the generated files from the -auto makefiles will be available soon separately on the net
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for convenience (people who don't want to install GNU tools).</para>
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</note>
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</sect2>
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<sect2 id="section-win32-install">
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<title>Installation on the system</title>
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<para>FIXME: This section needs be updated for GStreamer-1.0.</para>
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<!--
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<para>By default, GStreamer needs a registry. You have to generate it using "gst-register.exe". It will create
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the file in c:\gstreamer\registry.xml that will hold all the plugins you can use.</para>
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<para>You should install the GStreamer core in c:\gstreamer\bin and the plugins in c:\gstreamer\plugins. Both
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directories should be added to your system PATH. The library dependencies should be installed in c:\usr</para>
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<para>For example, my current setup is :</para>
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<itemizedlist>
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<listitem><para><filename>c:\gstreamer\registry.xml</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gst-inspect.exe</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gst-launch.exe</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gst-register.exe</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gstbytestream.dll</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gstelements.dll</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gstoptimalscheduler.dll</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\gstspider.dll</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\bin\libgtreamer-0.8.dll</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\plugins\gst-libs.dll</filename></para></listitem>
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<listitem><para><filename>c:\gstreamer\plugins\gstmatroska.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\iconv.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\intl.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\libglib-2.0-0.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\libgmodule-2.0-0.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\libgobject-2.0-0.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\libgthread-2.0-0.dll</filename></para></listitem>
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<listitem><para><filename>c:\usr\bin\libxml2.dll</filename></para></listitem>
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</itemizedlist>
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-->
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</sect2>
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</sect1>
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</chapter>
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