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gstreamer/gst-libs/gst/pbutils/install-plugins.c
Víctor Manuel Jáquez Leal 327d617d39 install-plugins: update documentation 
Use gst-inspect-1.0 instead of gst-inspect-0.10

https://bugzilla.gnome.org/show_bug.cgi?id=763316
2016-03-24 10:29:27 +02:00

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/* GStreamer base utils library plugin install support for applications
* Copyright (C) 2007 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2006 Ryan Lortie <desrt desrt ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstpbutilsinstallplugins
* @short_description: Missing plugin installation support for applications
*
* <refsect2>
* <title>Overview</title>
* <para>
* 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').
* </para>
* <para>
* 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.
* </para>
* <para>
* From the application perspective, plugin installation is usually triggered
* either
* <itemizedlist>
* <listitem><para>
* when the application itself has found that it wants or needs to install a
* certain element
* </para></listitem>
* <listitem><para>
* when the application has been notified by an element (such as playbin or
* decodebin) that one or more plugins are missing <emphasis>and</emphasis>
* the application has decided that it wants to install one or more of those
* missing plugins
* </para></listitem>
* </itemizedlist>
* </para>
* <title>Detail Strings</title>
* <para>
* 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.
* </para>
* <para>
* 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.
* </para>
* <para>
* Detail strings can be obtained using the function
* gst_missing_plugin_message_get_installer_detail() on a missing-plugin
* message. Such a message will either have been found by the application on
* a pipeline's #GstBus, or the application will have created it itself using
* gst_missing_element_message_new(), gst_missing_decoder_message_new(),
* gst_missing_encoder_message_new(), gst_missing_uri_sink_message_new(), or
* gst_missing_uri_source_message_new().
* </para>
* <title>Plugin Installation from the Application Perspective</title>
* <para>
* 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
* gst_missing_plugin_message_get_installer_detail(). 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.
* </para>
* <para>
* The application will then call gst_install_plugins_async(), 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 #GstInstallPluginsContext created
* with gst_install_plugins_context_new() may be passed as well. This way
* additional optional arguments like the application window's XID can be
* passed to the external installer application.
* </para>
* <para>
* gst_install_plugins_async() 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 gst_update_registry() so the
* run-time plugin registry is updated and the new plugins are made available
* to the application.
* <note>
* 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
* <programlisting>
* g_main_context_iteration (NULL,FALSE);
* </programlisting>
* from your code.
* </note>
* </para>
* <title>Plugin Installation from the Vendor/Distribution Perspective</title>
* <para>
* <emphasis>1. Installer hook</emphasis>
* </para>
* <para>
* When GStreamer applications initiate plugin installation via
* gst_install_plugins_async() or gst_install_plugins_sync(), a pre-defined
* helper application will be called.
* </para>
* <para>
* The exact path of the helper application to be called is set at compile
* time, usually by the <literal>./configure</literal> script based on the
* install prefix. For a normal package build into the <literal>/usr</literal>
* prefix, this will usually default to
* <filename>/usr/libexec/gst-install-plugins-helper</filename> or
* <filename>/usr/lib/gst-install-plugins-helper</filename>.
* </para>
* <para>
* Vendors/distros who want to support GStreamer plugin installation should
* either provide such a helper script/application or use the
* <literal>./configure</literal> option
* <literal>--with-install-plugins-helper=/path/to/installer</literal> to
* make GStreamer call an installer of their own directly.
* </para>
* <para>
* 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.
* </para>
* <para>
* The helper application path defined at compile time can be overriden at
* runtime by setting the <envar>GST_INSTALL_PLUGINS_HELPER</envar>
* environment variable. This can be useful for testing/debugging purposes.
* </para>
* <para>
* <emphasis>2. Arguments passed to the install helper</emphasis>
* </para>
* <para>
* 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]):
* <itemizedlist>
* <listitem><para>
* none to many optional arguments in the form of
* <literal>--foo-bar=val</literal>. Example:
* <literal>--transient-for=XID</literal> 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.
* </para></listitem>
* <listitem><para>
* one 'installer detail string' argument for each plugin to be installed;
* these strings will have a <literal>gstreamer</literal> prefix; the
* exact format of the detail string is explained below
* </para></listitem>
* </itemizedlist>
* </para>
* <para>
* <emphasis>3. Detail string describing the missing plugin</emphasis>
* </para>
* <para>
* 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:
* <itemizedlist>
* <listitem><para>
* plugin system identifier, ie. "gstreamer"
* </para><para>
* 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.
* </para></listitem>
* <listitem><para>
* plugin system version, e.g. "0.10"
* </para><para>
* 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.
* </para></listitem>
* <listitem><para>
* application identifier, e.g. "totem"
* </para><para>
* This may also be in the form of "pid/12345" if the program name can't
* be obtained for some reason.
* </para></listitem>
* <listitem><para>
* human-readable localised description of the required component,
* e.g. "Vorbis audio decoder"
* </para></listitem>
* <listitem><para>
* identifier string for the required component (see below for details about
* how to map this to the package/plugin that needs installing), e.g.
* <itemizedlist>
* <listitem><para>
* urisource-$(PROTOCOL_REQUIRED), e.g. urisource-http or urisource-mms
* </para></listitem>
* <listitem><para>
* element-$(ELEMENT_REQUIRED), e.g. element-videoconvert
* </para></listitem>
* <listitem><para>
* decoder-$(CAPS_REQUIRED), e.g. (do read below for more details!):
* <itemizedlist>
* <listitem><para>decoder-audio/x-vorbis</para></listitem>
* <listitem><para>decoder-application/ogg</para></listitem>
* <listitem><para>decoder-audio/mpeg, mpegversion=(int)4</para></listitem>
* <listitem><para>decoder-video/mpeg, systemstream=(boolean)true, mpegversion=(int)2</para></listitem>
</itemizedlist>
* </para></listitem>
* <listitem><para>
* encoder-$(CAPS_REQUIRED), e.g. encoder-audio/x-vorbis
* </para></listitem>
* </itemizedlist>
* </para></listitem>
* <listitem><para>
* optional further fields not yet specified
* </para></listitem>
* </itemizedlist>
* </para>
* <para>
* An entire ID string might then look like this, for example:
* <literal>
* gstreamer|0.10|totem|Vorbis audio decoder|decoder-audio/x-vorbis
* </literal>
* </para>
* <para>
* 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.
* </para>
* <para>
* Those unfamiliar with the GStreamer 'caps' system should note a few things
* about the caps string used in the above decoder/encoder case:
* <itemizedlist>
* <listitem><para>
* the first part ("video/mpeg") of the caps string is a GStreamer media
* type and <emphasis>not</emphasis> a MIME type. Wherever possible, the
* GStreamer media type will be the same as the corresponding MIME type,
* but often it is not.
* </para></listitem>
* <listitem><para>
* a caps string may or may not have additional comma-separated fields
* of various types (as seen in the examples above)
* </para></listitem>
* <listitem><para>
* 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:
* <itemizedlist>
* <listitem><para>
* <literal>audio/mpeg, mpegversion=(int)4</literal> vs.
* <literal>audio/mpeg, mpegversion=(int){2, 4}</literal>
* </para></listitem>
* <listitem><para>
* <literal>video/mpeg, mpegversion=(int)2</literal> vs.
* <literal>video/mpeg, systemstream=(boolean){ true, false}, mpegversion=(int)[1, 2]</literal>
* </para></listitem>
* </itemizedlist>
* </para></listitem>
* </itemizedlist>
* </para>
* <para>
* <emphasis>4. Exit codes the installer should return</emphasis>
* </para>
* <para>
* The installer should return one of the following exit codes when it exits:
* <itemizedlist>
* <listitem><para>
* 0 if all of the requested plugins could be installed
* (#GST_INSTALL_PLUGINS_SUCCESS)
* </para></listitem>
* <listitem><para>
* 1 if no appropriate installation candidate for any of the requested
* plugins could be found. Only return this if nothing has been installed
* (#GST_INSTALL_PLUGINS_NOT_FOUND)
* </para></listitem>
* <listitem><para>
* 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
* (#GST_INSTALL_PLUGINS_ERROR)
* </para></listitem>
* <listitem><para>
* 3 if some of the requested plugins could be installed, but not all
* (#GST_INSTALL_PLUGINS_PARTIAL_SUCCESS)
* </para></listitem>
* <listitem><para>
* 4 if the user aborted the installation (#GST_INSTALL_PLUGINS_USER_ABORT)
* </para></listitem>
* </itemizedlist>
* </para>
* <para>
* <emphasis>5. How to map the required detail string to packages</emphasis>
* </para>
* <para>
* 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.
* </para>
* <para>
* GStreamer plugin files can be introspected for this information. The
* <literal>gst-inspect</literal> utility has a special command line option
* that will output information similar to what is required. For example
* <command>
* $ gst-inspect-1.0 --print-plugin-auto-install-info /path/to/libgstvorbis.so
* </command>
* should output something along the lines of
* <computeroutput>
* decoder-audio/x-vorbis
* element-vorbisdec
* element-vorbisenc
* element-vorbisparse
* element-vorbistag
* encoder-audio/x-vorbis
* </computeroutput>
* Note that in the encoder and decoder case the introspected caps can be more
* complex with additional fields, e.g.
* <literal>audio/mpeg,mpegversion=(int){2,4}</literal>, 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 #GstCaps API, or by only taking into account the media type).
* </para>
* <para>
* 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).
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "install-plugins.h"
#include <gst/gstinfo.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <string.h>
/* best effort to make things compile and possibly even work on win32 */
#ifndef WEXITSTATUS
# define WEXITSTATUS(status) ((((guint)(status)) & 0xff00) >> 8)
#endif
#ifndef WIFEXITED
# define WIFEXITED(status) ((((guint)(status)) & 0x7f) == 0)
#endif
static gboolean install_in_progress; /* FALSE */
/* private struct */
struct _GstInstallPluginsContext
{
gchar *confirm_search;
gchar *desktop_id;
gchar *startup_notification_id;
guint xid;
};
/**
* gst_install_plugins_context_set_confirm_search:
* @ctx: a #GstInstallPluginsContext
* @confirm_search: whether to ask for confirmation before searching for plugins
*
* This function is used to tell the external installer process whether it
* should ask for confirmation or not before searching for missing plugins.
*
* If set, this option will be passed to the installer via a
* --interaction=[show-confirm-search|hide-confirm-search] command line option.
*
* Since: 1.6
*/
void
gst_install_plugins_context_set_confirm_search (GstInstallPluginsContext * ctx,
gboolean confirm_search)
{
g_return_if_fail (ctx != NULL);
if (confirm_search)
ctx->confirm_search = g_strdup ("show-confirm-search");
else
ctx->confirm_search = g_strdup ("hide-confirm-search");
}
/**
* gst_install_plugins_context_set_desktop_id:
* @ctx: a #GstInstallPluginsContext
* @desktop_id: the desktop file ID of the calling application
*
* This function is used to pass the calling application's desktop file ID to
* the external installer process.
*
* A desktop file ID is the basename of the desktop file, including the
* .desktop extension.
*
* If set, the desktop file ID will be passed to the installer via a
* --desktop-id= command line option.
*
* Since: 1.6
*/
void
gst_install_plugins_context_set_desktop_id (GstInstallPluginsContext * ctx,
const gchar * desktop_id)
{
g_return_if_fail (ctx != NULL);
ctx->desktop_id = g_strdup (desktop_id);
}
/**
* gst_install_plugins_context_set_startup_notification_id:
* @ctx: a #GstInstallPluginsContext
* @startup_id: the startup notification ID
*
* Sets the startup notification ID for the launched process.
*
* This is typically used to to pass the current X11 event timestamp to the
* external installer process.
*
* Startup notification IDs are defined in the
* [FreeDesktop.Org Startup Notifications standard](http://standards.freedesktop.org/startup-notification-spec/startup-notification-latest.txt).
*
* If set, the ID will be passed to the installer via a
* --startup-notification-id= command line option.
*
* GTK+/GNOME applications should be able to create a startup notification ID
* like this:
* <programlisting>
* timestamp = gtk_get_current_event_time ();
* startup_id = g_strdup_printf ("_TIME%u", timestamp);
* ...
* </programlisting>
*
* Since: 1.6
*/
void gst_install_plugins_context_set_startup_notification_id
(GstInstallPluginsContext * ctx, const gchar * startup_id)
{
g_return_if_fail (ctx != NULL);
ctx->startup_notification_id = g_strdup (startup_id);
}
/**
* gst_install_plugins_context_set_xid:
* @ctx: a #GstInstallPluginsContext
* @xid: the XWindow ID (XID) of the top-level application
*
* 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.
*
* If set, the XID will be passed to the installer via a --transient-for=XID
* command line option.
*
* Gtk+/Gnome application should be able to obtain the XID of the top-level
* window like this:
* <programlisting>
* ##include &lt;gtk/gtk.h&gt;
* ##ifdef GDK_WINDOWING_X11
* ##include &lt;gdk/gdkx.h&gt;
* ##endif
* ...
* ##ifdef GDK_WINDOWING_X11
* xid = GDK_WINDOW_XWINDOW (GTK_WIDGET (application_window)-&gt;window);
* ##endif
* ...
* </programlisting>
*/
void
gst_install_plugins_context_set_xid (GstInstallPluginsContext * ctx, guint xid)
{
g_return_if_fail (ctx != NULL);
ctx->xid = xid;
}
/**
* gst_install_plugins_context_new:
*
* Creates a new #GstInstallPluginsContext.
*
* Returns: a new #GstInstallPluginsContext. Free with
* gst_install_plugins_context_free() when no longer needed
*/
GstInstallPluginsContext *
gst_install_plugins_context_new (void)
{
return g_new0 (GstInstallPluginsContext, 1);
}
/**
* gst_install_plugins_context_free:
* @ctx: a #GstInstallPluginsContext
*
* Frees a #GstInstallPluginsContext.
*/
void
gst_install_plugins_context_free (GstInstallPluginsContext * ctx)
{
g_return_if_fail (ctx != NULL);
g_free (ctx->confirm_search);
g_free (ctx->desktop_id);
g_free (ctx->startup_notification_id);
g_free (ctx);
}
static GstInstallPluginsContext *
gst_install_plugins_context_copy (GstInstallPluginsContext * ctx)
{
GstInstallPluginsContext *ret;
ret = gst_install_plugins_context_new ();
ret->confirm_search = g_strdup (ctx->confirm_search);
ret->desktop_id = g_strdup (ctx->desktop_id);
ret->startup_notification_id = g_strdup (ctx->startup_notification_id);
ret->xid = ctx->xid;
return ret;
}
G_DEFINE_BOXED_TYPE (GstInstallPluginsContext, gst_install_plugins_context,
(GBoxedCopyFunc) gst_install_plugins_context_copy,
(GBoxedFreeFunc) gst_install_plugins_context_free);
static const gchar *
gst_install_plugins_get_helper (void)
{
const gchar *helper;
helper = g_getenv ("GST_INSTALL_PLUGINS_HELPER");
if (helper == NULL)
helper = GST_INSTALL_PLUGINS_HELPER;
GST_LOG ("Using plugin install helper '%s'", helper);
return helper;
}
static gboolean
ptr_array_contains_string (GPtrArray * arr, const gchar * s)
{
gint i;
for (i = 0; i < arr->len; ++i) {
if (strcmp ((const char *) g_ptr_array_index (arr, i), s) == 0)
return TRUE;
}
return FALSE;
}
static gboolean
gst_install_plugins_spawn_child (const gchar * const *details,
GstInstallPluginsContext * ctx, GPid * child_pid, gint * exit_status)
{
GPtrArray *arr;
gboolean ret;
GError *err = NULL;
gchar **argv;
arr = g_ptr_array_new_with_free_func (g_free);
/* argv[0] = helper path */
g_ptr_array_add (arr, g_strdup (gst_install_plugins_get_helper ()));
/* add any additional command line args from the context */
if (ctx != NULL && ctx->confirm_search) {
g_ptr_array_add (arr, g_strdup_printf ("--interaction=%s",
ctx->confirm_search));
}
if (ctx != NULL && ctx->desktop_id != NULL) {
g_ptr_array_add (arr, g_strdup_printf ("--desktop-id=%s", ctx->desktop_id));
}
if (ctx != NULL && ctx->startup_notification_id != NULL) {
g_ptr_array_add (arr, g_strdup_printf ("--startup-notification-id=%s",
ctx->startup_notification_id));
}
if (ctx != NULL && ctx->xid != 0) {
g_ptr_array_add (arr, g_strdup_printf ("--transient-for=%u", ctx->xid));
}
/* finally, add the detail strings, but without duplicates */
while (details != NULL && details[0] != NULL) {
if (!ptr_array_contains_string (arr, details[0]))
g_ptr_array_add (arr, g_strdup (details[0]));
++details;
}
/* and NULL-terminate */
g_ptr_array_add (arr, NULL);
argv = (gchar **) arr->pdata;
if (child_pid == NULL && exit_status != NULL) {
install_in_progress = TRUE;
ret = g_spawn_sync (NULL, argv, NULL, (GSpawnFlags) 0, NULL, NULL,
NULL, NULL, exit_status, &err);
install_in_progress = FALSE;
} else if (child_pid != NULL && exit_status == NULL) {
install_in_progress = TRUE;
ret = g_spawn_async (NULL, argv, NULL, G_SPAWN_DO_NOT_REAP_CHILD, NULL,
NULL, child_pid, &err);
} else {
g_return_val_if_reached (FALSE);
}
if (!ret) {
GST_ERROR ("Error spawning plugin install helper: %s", err->message);
g_error_free (err);
}
g_ptr_array_unref (arr);
return ret;
}
static GstInstallPluginsReturn
gst_install_plugins_return_from_status (gint status)
{
GstInstallPluginsReturn ret;
/* did we exit cleanly? */
if (!WIFEXITED (status)) {
ret = GST_INSTALL_PLUGINS_CRASHED;
} else {
ret = (GstInstallPluginsReturn) WEXITSTATUS (status);
/* did the helper return an invalid status code? */
if (((guint) ret) >= GST_INSTALL_PLUGINS_STARTED_OK &&
ret != GST_INSTALL_PLUGINS_INTERNAL_FAILURE) {
ret = GST_INSTALL_PLUGINS_INVALID;
}
}
GST_LOG ("plugin installer exited with status 0x%04x = %s", status,
gst_install_plugins_return_get_name (ret));
return ret;
}
typedef struct
{
GstInstallPluginsResultFunc func;
gpointer user_data;
} GstInstallPluginsAsyncHelper;
static void
gst_install_plugins_installer_exited (GPid pid, gint status, gpointer data)
{
GstInstallPluginsAsyncHelper *helper;
GstInstallPluginsReturn ret;
install_in_progress = FALSE;
helper = (GstInstallPluginsAsyncHelper *) data;
ret = gst_install_plugins_return_from_status (status);
GST_LOG ("calling plugin install result function %p", helper->func);
helper->func (ret, helper->user_data);
g_free (helper);
}
/**
* gst_install_plugins_async:
* @details: (array zero-terminated=1) (transfer none): NULL-terminated array
* of installer string details (see below)
* @ctx: (allow-none): a #GstInstallPluginsContext, or NULL
* @func: (scope async): the function to call when the installer program returns
* @user_data: (closure): the user data to pass to @func when called, or NULL
*
* Requests plugin installation without blocking. Once the plugins have been
* installed or installation has failed, @func will be called with the result
* of the installation and your provided @user_data pointer.
*
* 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).
*
* The installer strings that make up @detail are typically obtained by
* calling gst_missing_plugin_message_get_installer_detail() on missing-plugin
* messages that have been caught on a pipeline's bus or created by the
* application via the provided API, such as gst_missing_element_message_new().
*
* 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).
*
* Returns: result code whether an external installer could be started
*/
GstInstallPluginsReturn
gst_install_plugins_async (const gchar * const *details,
GstInstallPluginsContext * ctx, GstInstallPluginsResultFunc func,
gpointer user_data)
{
GstInstallPluginsAsyncHelper *helper;
GPid pid;
g_return_val_if_fail (details != NULL, GST_INSTALL_PLUGINS_INTERNAL_FAILURE);
g_return_val_if_fail (func != NULL, GST_INSTALL_PLUGINS_INTERNAL_FAILURE);
if (install_in_progress)
return GST_INSTALL_PLUGINS_INSTALL_IN_PROGRESS;
/* if we can't access our helper, don't bother */
if (!g_file_test (gst_install_plugins_get_helper (),
G_FILE_TEST_IS_EXECUTABLE))
return GST_INSTALL_PLUGINS_HELPER_MISSING;
if (!gst_install_plugins_spawn_child (details, ctx, &pid, NULL))
return GST_INSTALL_PLUGINS_INTERNAL_FAILURE;
helper = g_new (GstInstallPluginsAsyncHelper, 1);
helper->func = func;
helper->user_data = user_data;
g_child_watch_add (pid, gst_install_plugins_installer_exited, helper);
return GST_INSTALL_PLUGINS_STARTED_OK;
}
/**
* gst_install_plugins_sync:
* @details: (array zero-terminated=1) (transfer none): NULL-terminated array
* of installer string details
* @ctx: (allow-none): a #GstInstallPluginsContext, or NULL
*
* Requests plugin installation and block until the plugins have been
* installed or installation has failed.
*
* 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
* gst_install_plugins_async() instead of this function.
*
* Returns: the result of the installation.
*/
GstInstallPluginsReturn
gst_install_plugins_sync (const gchar * const *details,
GstInstallPluginsContext * ctx)
{
gint status;
g_return_val_if_fail (details != NULL, GST_INSTALL_PLUGINS_INTERNAL_FAILURE);
if (install_in_progress)
return GST_INSTALL_PLUGINS_INSTALL_IN_PROGRESS;
/* if we can't access our helper, don't bother */
if (!g_file_test (gst_install_plugins_get_helper (),
G_FILE_TEST_IS_EXECUTABLE))
return GST_INSTALL_PLUGINS_HELPER_MISSING;
if (!gst_install_plugins_spawn_child (details, ctx, NULL, &status))
return GST_INSTALL_PLUGINS_INTERNAL_FAILURE;
return gst_install_plugins_return_from_status (status);
}
/**
* gst_install_plugins_return_get_name:
* @ret: the return status code
*
* 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.
*
* Returns: a descriptive string for the status code in @ret
*/
const gchar *
gst_install_plugins_return_get_name (GstInstallPluginsReturn ret)
{
switch (ret) {
case GST_INSTALL_PLUGINS_SUCCESS:
return "success";
case GST_INSTALL_PLUGINS_NOT_FOUND:
return "not-found";
case GST_INSTALL_PLUGINS_ERROR:
return "install-error";
case GST_INSTALL_PLUGINS_CRASHED:
return "installer-exit-unclean";
case GST_INSTALL_PLUGINS_PARTIAL_SUCCESS:
return "partial-success";
case GST_INSTALL_PLUGINS_USER_ABORT:
return "user-abort";
case GST_INSTALL_PLUGINS_STARTED_OK:
return "started-ok";
case GST_INSTALL_PLUGINS_INTERNAL_FAILURE:
return "internal-failure";
case GST_INSTALL_PLUGINS_HELPER_MISSING:
return "helper-missing";
case GST_INSTALL_PLUGINS_INSTALL_IN_PROGRESS:
return "install-in-progress";
case GST_INSTALL_PLUGINS_INVALID:
return "invalid";
default:
break;
}
return "(UNKNOWN)";
}
/**
* gst_install_plugins_installation_in_progress:
*
* Checks whether plugin installation (initiated by this application only)
* is currently in progress.
*
* Returns: TRUE if plugin installation is in progress, otherwise FALSE
*/
gboolean
gst_install_plugins_installation_in_progress (void)
{
return install_in_progress;
}
/**
* gst_install_plugins_supported:
*
* 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.
*
* Returns: TRUE if plugin installation is likely to be supported.
*/
gboolean
gst_install_plugins_supported (void)
{
return g_file_test (gst_install_plugins_get_helper (),
G_FILE_TEST_IS_EXECUTABLE);
}
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