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<a href="#gst-plugins-base-libs-gstpbutilsinstallplugins.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="gst-plugins-base-libs-gstpbutilsinstallplugins"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstpbutilsinstallplugins.top_of_page"></a>gstpbutilsinstallplugins</span></h2>
<p>gstpbutilsinstallplugins — Missing plugin installation support for applications</p>
</td>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstpbutilsinstallplugins.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/pbutils/install-plugins.h>
enum <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn">GstInstallPluginsReturn</a>;
<span class="returnvalue">void</span> (<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsResultFunc" title="GstInstallPluginsResultFunc ()">*GstInstallPluginsResultFunc</a>) (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="type">GstInstallPluginsReturn</span></a> result</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="returnvalue">GstInstallPluginsReturn</span></a> <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()">gst_install_plugins_async</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **details</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsResultFunc" title="GstInstallPluginsResultFunc ()"><span class="type">GstInstallPluginsResultFunc</span></a> func</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="returnvalue">GstInstallPluginsReturn</span></a> <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-sync" title="gst_install_plugins_sync ()">gst_install_plugins_sync</a> (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **details</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>);
const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-return-get-name" title="gst_install_plugins_return_get_name ()">gst_install_plugins_return_get_name</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="type">GstInstallPluginsReturn</span></a> ret</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-installation-in-progress" title="gst_install_plugins_installation_in_progress ()">gst_install_plugins_installation_in_progress</a>
(<em class="parameter"><code><span class="type">void</span></code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-supported" title="gst_install_plugins_supported ()">gst_install_plugins_supported</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext">GstInstallPluginsContext</a>;
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="returnvalue">GstInstallPluginsContext</span></a> * <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-context-new" title="gst_install_plugins_context_new ()">gst_install_plugins_context_new</a>
(<em class="parameter"><code><span class="type">void</span></code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-context-free" title="gst_install_plugins_context_free ()">gst_install_plugins_context_free</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-context-set-xid" title="gst_install_plugins_context_set_xid ()">gst_install_plugins_context_set_xid</a> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> xid</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstpbutilsinstallplugins.description"></a><h2>Description</h2>
<p>
</p>
<div class="refsect2">
<a name="idp25467280"></a><h3>Overview</h3>
<p>
Using this API, applications can request the installation of missing
GStreamer plugins. These may be missing decoders/demuxers or encoders/muxers
for a certain format, sources or sinks for a certain URI protocol
(e.g. 'http'), or certain elements known by their element factory name
('audioresample').
</p>
<p>
Whether plugin installation is supported or not depends on the operating
system and/or distribution in question. The vendor of the operating system
needs to make sure the necessary hooks and mechanisms are in place for
plugin installation to work. See below for more detailed information.
</p>
<p>
From the application perspective, plugin installation is usually triggered
either
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
when the application itself has found that it wants or needs to install a
certain element
</p></li>
<li class="listitem"><p>
when the application has been notified by an element (such as playbin or
decodebin) that one or more plugins are missing <span class="emphasis"><em>and</em></span>
the application has decided that it wants to install one or more of those
missing plugins
</p></li>
</ul></div>
<p>
</p>
<p>
The install functions in this section all take one or more 'detail strings'.
These detail strings contain information about the type of plugin that
needs to be installed (decoder, encoder, source, sink, or named element),
and some additional information such GStreamer version used and a
human-readable description of the component to install for user dialogs.
</p>
<p>
Applications should not concern themselves with the composition of the
string itself. They should regard the string as if it was a shared secret
between GStreamer and the plugin installer application.
</p>
<p>
Detail strings can be obtained using the function
<a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-installer-detail" title="gst_missing_plugin_message_get_installer_detail ()"><code class="function">gst_missing_plugin_message_get_installer_detail()</code></a> on a missing-plugin
message. Such a message will either have been found by the application on
a pipeline's <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstBus.html"><span class="type">GstBus</span></a>, or the application will have created it itself using
<a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-element-message-new" title="gst_missing_element_message_new ()"><code class="function">gst_missing_element_message_new()</code></a>, <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-decoder-message-new" title="gst_missing_decoder_message_new ()"><code class="function">gst_missing_decoder_message_new()</code></a>,
<a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-encoder-message-new" title="gst_missing_encoder_message_new ()"><code class="function">gst_missing_encoder_message_new()</code></a>, <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-uri-sink-message-new" title="gst_missing_uri_sink_message_new ()"><code class="function">gst_missing_uri_sink_message_new()</code></a>, or
<a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-uri-source-message-new" title="gst_missing_uri_source_message_new ()"><code class="function">gst_missing_uri_source_message_new()</code></a>.
</p>
<p>
For each GStreamer element/plugin/component that should be installed, the
application needs one of those 'installer detail' string mentioned in the
previous section. This string can be obtained, as already mentioned above,
from a missing-plugin message using the function
<a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-installer-detail" title="gst_missing_plugin_message_get_installer_detail ()"><code class="function">gst_missing_plugin_message_get_installer_detail()</code></a>. The missing-plugin
message is either posted by another element and then found on the bus
by the application, or the application has created it itself as described
above.
</p>
<p>
The application will then call <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a>, passing a
NULL-terminated array of installer detail strings, and a function that
should be called when the installation of the plugins has finished
(successfully or not). Optionally, a <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> created
with <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-context-new" title="gst_install_plugins_context_new ()"><code class="function">gst_install_plugins_context_new()</code></a> may be passed as well. This way
additional optional arguments like the application window's XID can be
passed to the external installer application.
</p>
<p>
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a> will return almost immediately, with the
return code indicating whether plugin installation was started or not.
If the necessary hooks for plugin installation are in place and an
external installer application has in fact been called, the passed in
function will be called with a result code as soon as the external installer
has finished. If the result code indicates that new plugins have been
installed, the application will want to call <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-Gst.html#gst-update-registry"><code class="function">gst_update_registry()</code></a> so the
run-time plugin registry is updated and the new plugins are made available
to the application.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
A Gtk/GLib main loop must be running in order for the result function to
be called when the external installer has finished. If this is not the case,
make sure to regularly call
<pre class="programlisting">
g_main_context_iteration (NULL,FALSE);
</pre>
from your code.
</div>
<p>
</p>
<p>
<span class="emphasis"><em>1. Installer hook</em></span>
</p>
<p>
When GStreamer applications initiate plugin installation via
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a> or <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-sync" title="gst_install_plugins_sync ()"><code class="function">gst_install_plugins_sync()</code></a>, a pre-defined
helper application will be called.
</p>
<p>
The exact path of the helper application to be called is set at compile
time, usually by the <code class="literal">./configure</code> script based on the
install prefix. For a normal package build into the <code class="literal">/usr</code>
prefix, this will usually default to
<code class="filename">/usr/libexec/gst-install-plugins-helper</code> or
<code class="filename">/usr/lib/gst-install-plugins-helper</code>.
</p>
<p>
Vendors/distros who want to support GStreamer plugin installation should
either provide such a helper script/application or use the
<code class="literal">./configure</code> option
<code class="literal">--with-install-plugins-helper=/path/to/installer</code> to
make GStreamer call an installer of their own directly.
</p>
<p>
It is strongly recommended that vendors provide a small helper application
as interlocutor to the real installer though, even more so if command line
argument munging is required to transform the command line arguments
passed by GStreamer to the helper application into arguments that are
understood by the real installer.
</p>
<p>
The helper application path defined at compile time can be overriden at
runtime by setting the <code class="envar">GST_INSTALL_PLUGINS_HELPER</code>
environment variable. This can be useful for testing/debugging purposes.
</p>
<p>
<span class="emphasis"><em>2. Arguments passed to the install helper</em></span>
</p>
<p>
GStreamer will pass the following arguments to the install helper (this is
in addition to the path of the executable itself, which is by convention
argv[0]):
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
none to many optional arguments in the form of
<code class="literal">--foo-bar=val</code>. Example:
<code class="literal">--transient-for=XID</code> where XID is the X Window ID of
the main window of the calling application (so the installer can make
itself transient to that window). Unknown optional arguments should
be ignored by the installer.
</p></li>
<li class="listitem"><p>
one 'installer detail string' argument for each plugin to be installed;
these strings will have a <code class="literal">gstreamer</code> prefix; the
exact format of the detail string is explained below
</p></li>
</ul></div>
<p>
</p>
<p>
<span class="emphasis"><em>3. Detail string describing the missing plugin</em></span>
</p>
<p>
The string is in UTF-8 encoding and is made up of several fields, separated
by '|' characters (but neither the first nor the last character is a '|').
The fields are:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<p>
plugin system identifier, ie. "gstreamer"
</p>
<p>
This identifier determines the format of the rest of the detail string.
Automatic plugin installers should not process detail strings with
unknown identifiers. This allows other plugin-based libraries to use
the same mechanism for their automatic plugin installation needs, or
for the format to be changed should it turn out to be insufficient.
</p>
</li>
<li class="listitem">
<p>
plugin system version, e.g. "0.10"
</p>
<p>
This is required so that when there is a GStreamer-0.12 or GStreamer-1.0
at some point in future, the different major versions can still co-exist
and use the same plugin install mechanism in the same way.
</p>
</li>
<li class="listitem">
<p>
application identifier, e.g. "totem"
</p>
<p>
This may also be in the form of "pid/12345" if the program name can't
be obtained for some reason.
</p>
</li>
<li class="listitem"><p>
human-readable localised description of the required component,
e.g. "Vorbis audio decoder"
</p></li>
<li class="listitem">
<p>
identifier string for the required component (see below for details about
how to map this to the package/plugin that needs installing), e.g.
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem"><p>
urisource-$(PROTOCOL_REQUIRED), e.g. urisource-http or urisource-mms
</p></li>
<li class="listitem"><p>
element-$(ELEMENT_REQUIRED), e.g. element-ffmpegcolorspace
</p></li>
<li class="listitem">
<p>
decoder-$(CAPS_REQUIRED), e.g. (do read below for more details!):
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="square">
<li class="listitem"><p>decoder-audio/x-vorbis</p></li>
<li class="listitem"><p>decoder-application/ogg</p></li>
<li class="listitem"><p>decoder-audio/mpeg, mpegversion=(int)4</p></li>
<li class="listitem"><p>decoder-video/mpeg, systemstream=(boolean)true, mpegversion=(int)2</p></li>
</ul></div>
<p>
</p>
</li>
<li class="listitem"><p>
encoder-$(CAPS_REQUIRED), e.g. encoder-audio/x-vorbis
</p></li>
</ul></div>
<p>
</p>
</li>
<li class="listitem"><p>
optional further fields not yet specified
</p></li>
</ul></div>
<p>
</p>
<p>
An entire ID string might then look like this, for example:
<code class="literal">
gstreamer|0.10|totem|Vorbis audio decoder|decoder-audio/x-vorbis
</code>
</p>
<p>
Plugin installers parsing this ID string should expect further fields also
separated by '|' symbols and either ignore them, warn the user, or error
out when encountering them.
</p>
<p>
Those unfamiliar with the GStreamer 'caps' system should note a few things
about the caps string used in the above decoder/encoder case:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
the first part ("video/mpeg") of the caps string is a GStreamer media
type and <span class="emphasis"><em>not</em></span> a MIME type. Wherever possible, the
GStreamer media type will be the same as the corresponding MIME type,
but often it is not.
</p></li>
<li class="listitem"><p>
a caps string may or may not have additional comma-separated fields
of various types (as seen in the examples above)
</p></li>
<li class="listitem">
<p>
the caps string of a 'required' component (as above) will always have
fields with fixed values, whereas an introspected string (see below)
may have fields with non-fixed values. Compare for example:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="circle">
<li class="listitem"><p>
<code class="literal">audio/mpeg, mpegversion=(int)4</code> vs.
<code class="literal">audio/mpeg, mpegversion=(int){2, 4}</code>
</p></li>
<li class="listitem"><p>
<code class="literal">video/mpeg, mpegversion=(int)2</code> vs.
<code class="literal">video/mpeg, systemstream=(boolean){ true, false}, mpegversion=(int)[1, 2]</code>
</p></li>
</ul></div>
<p>
</p>
</li>
</ul></div>
<p>
</p>
<p>
<span class="emphasis"><em>4. Exit codes the installer should return</em></span>
</p>
<p>
The installer should return one of the following exit codes when it exits:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
0 if all of the requested plugins could be installed
(<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GST-INSTALL-PLUGINS-SUCCESS:CAPS"><span class="type">GST_INSTALL_PLUGINS_SUCCESS</span></a>)
</p></li>
<li class="listitem"><p>
1 if no appropriate installation candidate for any of the requested
plugins could be found. Only return this if nothing has been installed
(<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GST-INSTALL-PLUGINS-NOT-FOUND:CAPS"><span class="type">GST_INSTALL_PLUGINS_NOT_FOUND</span></a>)
</p></li>
<li class="listitem"><p>
2 if an error occured during the installation. The application will
assume that the user will already have seen an error message by the
installer in this case and will usually not show another one
(<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GST-INSTALL-PLUGINS-ERROR:CAPS"><span class="type">GST_INSTALL_PLUGINS_ERROR</span></a>)
</p></li>
<li class="listitem"><p>
3 if some of the requested plugins could be installed, but not all
(<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GST-INSTALL-PLUGINS-PARTIAL-SUCCESS:CAPS"><span class="type">GST_INSTALL_PLUGINS_PARTIAL_SUCCESS</span></a>)
</p></li>
<li class="listitem"><p>
4 if the user aborted the installation (<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GST-INSTALL-PLUGINS-USER-ABORT:CAPS"><span class="type">GST_INSTALL_PLUGINS_USER_ABORT</span></a>)
</p></li>
</ul></div>
<p>
</p>
<p>
<span class="emphasis"><em>5. How to map the required detail string to packages</em></span>
</p>
<p>
It is up to the vendor to find mechanism to map required components from
the detail string to the actual packages/plugins to install. This could
be a hardcoded list of mappings, for example, or be part of the packaging
system metadata.
</p>
<p>
GStreamer plugin files can be introspected for this information. The
<code class="literal">gst-inspect</code> utility has a special command line option
that will output information similar to what is required. For example
<span class="command"><strong>
$ gst-inspect-0.10 --print-plugin-auto-install-info /path/to/libgstvorbis.so
</strong></span>
should output something along the lines of
<code class="computeroutput">
decoder-audio/x-vorbis
element-vorbisdec
element-vorbisenc
element-vorbisparse
element-vorbistag
encoder-audio/x-vorbis
</code>
Note that in the encoder and decoder case the introspected caps can be more
complex with additional fields, e.g.
<code class="literal">audio/mpeg,mpegversion=(int){2,4}</code>, so they will not
always exactly match the caps wanted by the application. It is up to the
installer to deal with this (either by doing proper caps intersection using
the GStreamer <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> API, or by only taking into account the media type).
</p>
<p>
Another potential source of problems are plugins such as ladspa or
libvisual where the list of elements depends on the installed
ladspa/libvisual plugins at the time. This is also up to the distribution
to handle (but usually not relevant for playback applications).
</p>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstpbutilsinstallplugins.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstInstallPluginsReturn"></a><h3>enum GstInstallPluginsReturn</h3>
<pre class="programlisting">typedef enum {
/* Return codes from the installer. Returned by gst_install_plugins_sync(),
* or passed as result code to your #GstInstallPluginsResultFunc */
GST_INSTALL_PLUGINS_SUCCESS = 0,
GST_INSTALL_PLUGINS_NOT_FOUND = 1,
GST_INSTALL_PLUGINS_ERROR = 2,
GST_INSTALL_PLUGINS_PARTIAL_SUCCESS = 3,
GST_INSTALL_PLUGINS_USER_ABORT = 4,
/* Returned by gst_install_plugins_sync(), or passed as result code to your
* #GstInstallPluginsResultFunc */
GST_INSTALL_PLUGINS_CRASHED = 100,
GST_INSTALL_PLUGINS_INVALID,
/* Return codes from starting the external helper, may be returned by both
* gst_install_plugins_sync() and gst_install_plugins_async(), but should
* never be seen by a #GstInstallPluginsResultFunc */
GST_INSTALL_PLUGINS_STARTED_OK = 200,
GST_INSTALL_PLUGINS_INTERNAL_FAILURE,
GST_INSTALL_PLUGINS_HELPER_MISSING,
GST_INSTALL_PLUGINS_INSTALL_IN_PROGRESS
} GstInstallPluginsReturn;
</pre>
<p>
Result codes returned by <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a> and
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-sync" title="gst_install_plugins_sync ()"><code class="function">gst_install_plugins_sync()</code></a>, and also the result code passed to the
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsResultFunc" title="GstInstallPluginsResultFunc ()"><span class="type">GstInstallPluginsResultFunc</span></a> specified with <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a>.
</p>
<p>
These codes indicate success or failure of starting an external installer
program and to what extent the requested plugins could be installed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-SUCCESS:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_SUCCESS</code></span></p></td>
<td>all of the requested plugins could be
installed
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-NOT-FOUND:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_NOT_FOUND</code></span></p></td>
<td>no appropriate installation candidate for
any of the requested plugins could be found. Only return this if nothing
has been installed. Return <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GST-INSTALL-PLUGINS-PARTIAL-SUCCESS:CAPS"><span class="type">GST_INSTALL_PLUGINS_PARTIAL_SUCCESS</span></a> if
some (but not all) of the requested plugins could be installed.
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-ERROR:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_ERROR</code></span></p></td>
<td>an error occured during the installation. If
this happens, the user has already seen an error message and another
one should not be displayed
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-PARTIAL-SUCCESS:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_PARTIAL_SUCCESS</code></span></p></td>
<td>some of the requested plugins could
be installed, but not all
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-USER-ABORT:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_USER_ABORT</code></span></p></td>
<td>the user has aborted the installation
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-CRASHED:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_CRASHED</code></span></p></td>
<td>the installer had an unclean exit code
(ie. death by signal)
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-INVALID:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_INVALID</code></span></p></td>
<td>the helper returned an invalid status code
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-STARTED-OK:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_STARTED_OK</code></span></p></td>
<td>returned by <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a> to
indicate that everything went fine so far and the provided callback
will be called with the result of the installation later
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-INTERNAL-FAILURE:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_INTERNAL_FAILURE</code></span></p></td>
<td>some internal failure has
occured when trying to start the installer
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-HELPER-MISSING:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_HELPER_MISSING</code></span></p></td>
<td>the helper script to call the
actual installer is not installed
</td>
</tr>
<tr>
<td><p><a name="GST-INSTALL-PLUGINS-INSTALL-IN-PROGRESS:CAPS"></a><span class="term"><code class="literal">GST_INSTALL_PLUGINS_INSTALL_IN_PROGRESS</code></span></p></td>
<td>a previously-started plugin
installation is still in progress, try again later
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="GstInstallPluginsResultFunc"></a><h3>GstInstallPluginsResultFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstInstallPluginsResultFunc) (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="type">GstInstallPluginsReturn</span></a> result</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
The prototype of the callback function that will be called once the
external plugin installer program has returned. You only need to provide
a callback function if you are using the asynchronous interface.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>result</code></em> :</span></p></td>
<td>whether the installation of the requested plugins succeeded or not</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the user data passed to <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-async"></a><h3>gst_install_plugins_async ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="returnvalue">GstInstallPluginsReturn</span></a> gst_install_plugins_async (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **details</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsResultFunc" title="GstInstallPluginsResultFunc ()"><span class="type">GstInstallPluginsResultFunc</span></a> func</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Requests plugin installation without blocking. Once the plugins have been
installed or installation has failed, <em class="parameter"><code>func</code></em> will be called with the result
of the installation and your provided <em class="parameter"><code>user_data</code></em> pointer.
</p>
<p>
This function requires a running GLib/Gtk main loop. If you are not
running a GLib/Gtk main loop, make sure to regularly call
g_main_context_iteration(NULL,FALSE).
</p>
<p>
The installer strings that make up <em class="parameter"><code>detail</code></em> are typically obtained by
calling <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-plugin-message-get-installer-detail" title="gst_missing_plugin_message_get_installer_detail ()"><code class="function">gst_missing_plugin_message_get_installer_detail()</code></a> on missing-plugin
messages that have been caught on a pipeline's bus or created by the
application via the provided API, such as <a class="link" href="gst-plugins-base-libs-gstpbutilsmissingplugins.html#gst-missing-element-message-new" title="gst_missing_element_message_new ()"><code class="function">gst_missing_element_message_new()</code></a>.
</p>
<p>
It is possible to request the installation of multiple missing plugins in
one go (as might be required if there is a demuxer for a certain format
installed but no suitable video decoder and no suitable audio decoder).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>details</code></em> :</span></p></td>
<td>NULL-terminated array of installer string details (see below)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>, or NULL</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to call when the installer program returns. <span class="annotation">[<acronym title="The callback is valid until first called."><span class="acronym">scope async</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the user data to pass to <em class="parameter"><code>func</code></em> when called, or NULL. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>result code whether an external installer could be started</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-sync"></a><h3>gst_install_plugins_sync ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="returnvalue">GstInstallPluginsReturn</span></a> gst_install_plugins_sync (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **details</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>);</pre>
<p>
Requests plugin installation and block until the plugins have been
installed or installation has failed.
</p>
<p>
This function should almost never be used, it only exists for cases where
a non-GLib main loop is running and the user wants to run it in a separate
thread and marshal the result back asynchronously into the main thread
using the other non-GLib main loop. You should almost always use
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-async" title="gst_install_plugins_async ()"><code class="function">gst_install_plugins_async()</code></a> instead of this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>details</code></em> :</span></p></td>
<td>NULL-terminated array of installer string details</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>, or NULL</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result of the installation.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-return-get-name"></a><h3>gst_install_plugins_return_get_name ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_install_plugins_return_get_name (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsReturn" title="enum GstInstallPluginsReturn"><span class="type">GstInstallPluginsReturn</span></a> ret</code></em>);</pre>
<p>
Convenience function to return the descriptive string associated
with a status code. This function returns English strings and
should not be used for user messages. It is here only to assist
in debugging.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>the return status code</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a descriptive string for the status code in <em class="parameter"><code>ret</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-installation-in-progress"></a><h3>gst_install_plugins_installation_in_progress ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_install_plugins_installation_in_progress
(<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Checks whether plugin installation (initiated by this application only)
is currently in progress.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if plugin installation is in progress, otherwise FALSE</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-supported"></a><h3>gst_install_plugins_supported ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_install_plugins_supported (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Checks whether plugin installation is likely to be supported by the
current environment. This currently only checks whether the helper script
that is to be provided by the distribution or operating system vendor
exists.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if plugin installation is likely to be supported.</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.15</p>
</div>
<hr>
<div class="refsect2">
<a name="GstInstallPluginsContext"></a><h3>GstInstallPluginsContext</h3>
<pre class="programlisting">typedef struct _GstInstallPluginsContext GstInstallPluginsContext;</pre>
<p>
Opaque context structure for the plugin installation. Use the provided
API to set details on it.
</p>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-context-new"></a><h3>gst_install_plugins_context_new ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="returnvalue">GstInstallPluginsContext</span></a> * gst_install_plugins_context_new
(<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Creates a new <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>. Free with
<a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#gst-install-plugins-context-free" title="gst_install_plugins_context_free ()"><code class="function">gst_install_plugins_context_free()</code></a> when no longer needed</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-context-free"></a><h3>gst_install_plugins_context_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_install_plugins_context_free (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>);</pre>
<p>
Frees a <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-install-plugins-context-set-xid"></a><h3>gst_install_plugins_context_set_xid ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_install_plugins_context_set_xid (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a> *ctx</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> xid</code></em>);</pre>
<p>
This function is for X11-based applications (such as most Gtk/Qt
applications on linux/unix) only. You can use it to tell the external
installer the XID of your main application window. That way the installer
can make its own window transient to your application window during the
installation.
</p>
<p>
If set, the XID will be passed to the installer via a --transient-for=XID
command line option.
</p>
<p>
Gtk+/Gnome application should be able to obtain the XID of the top-level
window like this:
</p>
<pre class="programlisting">
##include <gtk/gtk.h>
##ifdef GDK_WINDOWING_X11
##include <gdk/gdkx.h>
##endif
...
##ifdef GDK_WINDOWING_X11
xid = GDK_WINDOW_XWINDOW (GTK_WIDGET (application_window)->window);
##endif
...
</pre>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstpbutilsinstallplugins.html#GstInstallPluginsContext" title="GstInstallPluginsContext"><span class="type">GstInstallPluginsContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xid</code></em> :</span></p></td>
<td>the XWindow ID (XID) of the top-level application</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.12</p>
</div>
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