2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gst.c: Initialization and non-pipeline operations
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
25 * @short_description: Media library supporting arbitrary formats and filter
27 * @see_also: Check out both <ulink url="http://www.cse.ogi.edu/sysl/">OGI's
28 * pipeline</ulink> and Microsoft's DirectShow for some background.
30 * GStreamer is a framework for constructing graphs of various filters
31 * (termed elements here) that will handle streaming media. Any discreet
32 * (packetizable) media type is supported, with provisions for automatically
33 * determining source type. Formatting/framing information is provided with
34 * a powerful negotiation framework. Plugins are heavily used to provide for
35 * all elements, allowing one to construct plugins outside of the GST
36 * library, even released binary-only if license require (please don't).
38 * GStreamer borrows heavily from both the <ulink
39 * url="http://www.cse.ogi.edu/sysl/">OGI media pipeline</ulink> and
40 * Microsoft's DirectShow, hopefully taking the best of both and leaving the
41 * cruft behind. Its interface is slowly getting stable.
43 * The <application>GStreamer</application> library should be initialized with
44 * gst_init() before it can be used. You should pass pointers to the main argc
45 * and argv variables so that GStreamer can process its own command line
46 * options, as shown in the following example.
49 * <title>Initializing the gstreamer library</title>
50 * <programlisting language="c">
52 * main (int argc, char *argv[])
54 * // initialize the GStreamer library
55 * gst_init (&argc, &argv);
61 * It's allowed to pass two NULL pointers to gst_init() in case you don't want
62 * to pass the command line args to GStreamer.
64 * You can also use GOption to initialize your own parameters as shown in
65 * the next code fragment:
67 * <title>Initializing own parameters when initializing gstreamer</title>
69 * static gboolean stats = FALSE;
72 * main (int argc, char *argv[])
74 * GOptionEntry options[] = {
75 * {"tags", 't', 0, G_OPTION_ARG_NONE, &tags,
76 * N_("Output tags (also known as metadata)"), NULL},
79 * // must initialise the threading system before using any other GLib funtion
80 * if (!g_thread_supported ())
81 * g_thread_init (NULL);
82 * ctx = g_option_context_new ("[ADDITIONAL ARGUMENTS]");
83 * g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
84 * g_option_context_add_group (ctx, gst_init_get_option_group ());
85 * if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
86 * g_print ("Error initializing: %s\n", GST_STR_NULL (err->message));
89 * g_option_context_free (ctx);
95 * Use gst_version() to query the library version at runtime or use the
96 * GST_VERSION_* macros to find the version at compile time. Optionally
97 * gst_version_string() returns a printable string.
99 * The gst_deinit() call is used to clean up all internal resources used
100 * by <application>GStreamer</application>. It is mostly used in unit tests
101 * to check for leaks.
103 * Last reviewed on 2006-08-11 (0.10.10)
106 #include "gst_private.h"
109 #include <sys/types.h>
111 #include <sys/wait.h>
112 #endif /* HAVE_FORK */
113 #ifdef HAVE_SYS_UTSNAME_H
114 #include <sys/utsname.h>
120 #include "gst-i18n-lib.h"
121 #include <locale.h> /* for LC_ALL */
125 #define GST_CAT_DEFAULT GST_CAT_GST_INIT
127 #define MAX_PATH_SPLIT 16
128 #define GST_PLUGIN_SEPARATOR ","
130 static gboolean gst_initialized = FALSE;
131 static gboolean gst_deinitialized = FALSE;
133 #ifndef GST_DISABLE_REGISTRY
134 static GList *plugin_paths = NULL; /* for delayed processing in post_init */
137 #ifndef GST_DISABLE_GST_DEBUG
138 extern const gchar *priv_gst_dump_dot_dir;
142 #if defined(HAVE_FORK) && !defined(GST_HAVE_UNSAFE_FORK)
143 #define DEFAULT_FORK TRUE
145 #define DEFAULT_FORK FALSE
146 #endif /* HAVE_FORK */
148 /* set to TRUE when segfaults need to be left as is */
149 static gboolean _gst_disable_segtrap = FALSE;
151 /* control the behaviour of registry rebuild */
152 static gboolean _gst_enable_registry_fork = DEFAULT_FORK;
154 /*set to TRUE when registry needn't to be updated */
155 static gboolean _gst_disable_registry_update = FALSE;
157 static void load_plugin_func (gpointer data, gpointer user_data);
158 static gboolean init_pre (GOptionContext * context, GOptionGroup * group,
159 gpointer data, GError ** error);
160 static gboolean init_post (GOptionContext * context, GOptionGroup * group,
161 gpointer data, GError ** error);
162 #ifndef GST_DISABLE_OPTION_PARSING
163 static gboolean parse_goption_arg (const gchar * s_opt,
164 const gchar * arg, gpointer data, GError ** err);
167 static GSList *preload_plugins = NULL;
169 const gchar g_log_domain_gstreamer[] = "GStreamer";
172 debug_log_handler (const gchar * log_domain,
173 GLogLevelFlags log_level, const gchar * message, gpointer user_data)
175 g_log_default_handler (log_domain, log_level, message, user_data);
176 /* FIXME: do we still need this ? fatal errors these days are all
177 * other than core errors */
178 /* g_on_error_query (NULL); */
185 #ifndef GST_DISABLE_GST_DEBUG
196 ARG_REGISTRY_UPDATE_DISABLE,
197 ARG_REGISTRY_FORK_DISABLE
200 /* debug-spec ::= category-spec [, category-spec]*
201 * category-spec ::= category:val | val
210 #ifndef GST_DISABLE_GST_DEBUG
212 parse_debug_category (gchar * str, const gchar ** category)
229 parse_debug_level (gchar * str, gint * level)
237 if (str[0] != NUL && str[1] == NUL
238 && str[0] >= '0' && str[0] < '0' + GST_LEVEL_COUNT) {
239 *level = str[0] - '0';
247 parse_debug_list (const gchar * list)
252 g_return_if_fail (list != NULL);
254 split = g_strsplit (list, ",", 0);
256 for (walk = split; *walk; walk++) {
257 if (strchr (*walk, ':')) {
258 gchar **values = g_strsplit (*walk, ":", 2);
260 if (values[0] && values[1]) {
262 const gchar *category;
264 if (parse_debug_category (values[0], &category)
265 && parse_debug_level (values[1], &level))
266 gst_debug_set_threshold_for_name (category, level);
273 if (parse_debug_level (*walk, &level))
274 gst_debug_set_default_threshold (level);
283 * gst_init_get_option_group:
285 * Returns a #GOptionGroup with GStreamer's argument specifications. The
286 * group is set up to use standard GOption callbacks, so when using this
287 * group in combination with GOption parsing methods, all argument parsing
288 * and initialization is automated.
290 * This function is useful if you want to integrate GStreamer with other
291 * libraries that use GOption (see g_option_context_add_group() ).
293 * If you use this function, you should make sure you initialise the GLib
294 * threading system as one of the very first things in your program
295 * (see the example at the beginning of this section).
297 * Returns: a pointer to GStreamer's option group.
301 gst_init_get_option_group (void)
303 #ifndef GST_DISABLE_OPTION_PARSING
305 static const GOptionEntry gst_args[] = {
306 {"gst-version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
307 (gpointer) parse_goption_arg, N_("Print the GStreamer version"), NULL},
308 {"gst-fatal-warnings", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
309 (gpointer) parse_goption_arg, N_("Make all warnings fatal"), NULL},
310 #ifndef GST_DISABLE_GST_DEBUG
311 {"gst-debug-help", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
312 (gpointer) parse_goption_arg,
313 N_("Print available debug categories and exit"),
315 {"gst-debug-level", 0, 0, G_OPTION_ARG_CALLBACK,
316 (gpointer) parse_goption_arg,
317 N_("Default debug level from 1 (only error) to 5 (anything) or "
320 {"gst-debug", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) parse_goption_arg,
321 N_("Comma-separated list of category_name:level pairs to set "
322 "specific levels for the individual categories. Example: "
323 "GST_AUTOPLUG:5,GST_ELEMENT_*:3"),
325 {"gst-debug-no-color", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
326 (gpointer) parse_goption_arg, N_("Disable colored debugging output"),
328 {"gst-debug-disable", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
329 (gpointer) parse_goption_arg, N_("Disable debugging"), NULL},
331 {"gst-plugin-spew", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
332 (gpointer) parse_goption_arg,
333 N_("Enable verbose plugin loading diagnostics"),
335 {"gst-plugin-path", 0, 0, G_OPTION_ARG_CALLBACK,
336 (gpointer) parse_goption_arg,
337 N_("Colon-separated paths containing plugins"), N_("PATHS")},
338 {"gst-plugin-load", 0, 0, G_OPTION_ARG_CALLBACK,
339 (gpointer) parse_goption_arg,
340 N_("Comma-separated list of plugins to preload in addition to the "
341 "list stored in environment variable GST_PLUGIN_PATH"),
343 {"gst-disable-segtrap", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
344 (gpointer) parse_goption_arg,
345 N_("Disable trapping of segmentation faults during plugin loading"),
347 {"gst-disable-registry-update", 0, G_OPTION_FLAG_NO_ARG,
348 G_OPTION_ARG_CALLBACK,
349 (gpointer) parse_goption_arg,
350 N_("Disable updating the registry"),
352 {"gst-disable-registry-fork", 0, G_OPTION_FLAG_NO_ARG,
353 G_OPTION_ARG_CALLBACK,
354 (gpointer) parse_goption_arg,
355 N_("Disable the use of fork() while scanning the registry"),
360 /* The GLib threading system must be initialised before calling any other
361 * GLib function according to the documentation; if the application hasn't
362 * called gst_init() yet or initialised the threading system otherwise, we
363 * better issue a warning here (since chances are high that the application
364 * has already called other GLib functions such as g_option_context_new() */
365 if (!g_thread_supported ()) {
366 g_warning ("The GStreamer function gst_init_get_option_group() was\n"
367 "\tcalled, but the GLib threading system has not been initialised\n"
368 "\tyet, something that must happen before any other GLib function\n"
369 "\tis called. The application needs to be fixed so that it calls\n"
370 "\t if (!g_thread_supported ()) g_thread_init(NULL);\n"
371 "\tas very first thing in its main() function. Please file a bug\n"
372 "\tagainst this application.");
373 g_thread_init (NULL);
376 group = g_option_group_new ("gst", _("GStreamer Options"),
377 _("Show GStreamer Options"), NULL, NULL);
378 g_option_group_set_parse_hooks (group, (GOptionParseFunc) init_pre,
379 (GOptionParseFunc) init_post);
381 g_option_group_add_entries (group, gst_args);
382 g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
392 * @argc: pointer to application's argc
393 * @argv: pointer to application's argv
394 * @err: pointer to a #GError to which a message will be posted on error
396 * Initializes the GStreamer library, setting up internal path lists,
397 * registering built-in elements, and loading standard plugins.
399 * This function will return %FALSE if GStreamer could not be initialized
400 * for some reason. If you want your program to fail fatally,
401 * use gst_init() instead.
403 * This function should be called before calling any other GLib functions. If
404 * this is not an option, your program must initialise the GLib thread system
405 * using g_thread_init() before any other GLib functions are called.
407 * Returns: %TRUE if GStreamer could be initialized.
410 gst_init_check (int *argc, char **argv[], GError ** err)
412 #ifndef GST_DISABLE_OPTION_PARSING
418 if (!g_thread_supported ())
419 g_thread_init (NULL);
421 if (gst_initialized) {
422 GST_DEBUG ("already initialized gst");
425 #ifndef GST_DISABLE_OPTION_PARSING
426 ctx = g_option_context_new ("- GStreamer initialization");
427 g_option_context_set_ignore_unknown_options (ctx, TRUE);
428 group = gst_init_get_option_group ();
429 g_option_context_add_group (ctx, group);
430 res = g_option_context_parse (ctx, argc, argv, err);
431 g_option_context_free (ctx);
433 init_pre (NULL, NULL, NULL, NULL);
434 init_post (NULL, NULL, NULL, NULL);
438 gst_initialized = res;
441 GST_INFO ("initialized GStreamer successfully");
443 GST_INFO ("failed to initialize GStreamer");
451 * @argc: pointer to application's argc
452 * @argv: pointer to application's argv
454 * Initializes the GStreamer library, setting up internal path lists,
455 * registering built-in elements, and loading standard plugins.
457 * This function should be called before calling any other GLib functions. If
458 * this is not an option, your program must initialise the GLib thread system
459 * using g_thread_init() before any other GLib functions are called.
462 * This function will terminate your program if it was unable to initialize
463 * GStreamer for some reason. If you want your program to fall back,
464 * use gst_init_check() instead.
467 * WARNING: This function does not work in the same way as corresponding
468 * functions in other glib-style libraries, such as gtk_init(). In
469 * particular, unknown command line options cause this function to
470 * abort program execution.
473 gst_init (int *argc, char **argv[])
477 if (!gst_init_check (argc, argv, &err)) {
478 g_print ("Could not initialize GStreamer: %s\n",
479 err ? err->message : "unknown error occurred");
487 #ifndef GST_DISABLE_REGISTRY
489 add_path_func (gpointer data, gpointer user_data)
491 GST_INFO ("Adding plugin path: \"%s\", will scan later", (gchar *) data);
492 plugin_paths = g_list_append (plugin_paths, g_strdup (data));
496 #ifndef GST_DISABLE_OPTION_PARSING
498 prepare_for_load_plugin_func (gpointer data, gpointer user_data)
500 preload_plugins = g_slist_prepend (preload_plugins, g_strdup (data));
505 load_plugin_func (gpointer data, gpointer user_data)
508 const gchar *filename;
511 filename = (const gchar *) data;
513 plugin = gst_plugin_load_file (filename, &err);
516 GST_INFO ("Loaded plugin: \"%s\"", filename);
518 gst_default_registry_add_plugin (plugin);
521 /* Report error to user, and free error */
522 GST_ERROR ("Failed to load plugin: %s", err->message);
525 GST_WARNING ("Failed to load plugin: \"%s\"", filename);
530 #ifndef GST_DISABLE_OPTION_PARSING
532 split_and_iterate (const gchar * stringlist, gchar * separator, GFunc iterator,
537 gchar *lastlist = g_strdup (stringlist);
540 strings = g_strsplit (lastlist, separator, MAX_PATH_SPLIT);
545 iterator (strings[j], user_data);
546 if (++j == MAX_PATH_SPLIT) {
547 lastlist = g_strdup (strings[j]);
552 g_strfreev (strings);
557 /* we have no fail cases yet, but maybe in the future */
559 init_pre (GOptionContext * context, GOptionGroup * group, gpointer data,
562 if (gst_initialized) {
563 GST_DEBUG ("already initialized");
567 /* GStreamer was built against a GLib >= 2.8 and is therefore not doing
568 * the refcount hack. Check that it isn't being run against an older GLib */
569 if (glib_major_version < 2 ||
570 (glib_major_version == 2 && glib_minor_version < 8)) {
571 g_warning ("GStreamer was compiled against GLib %d.%d.%d but is running"
572 " against %d.%d.%d. This will cause reference counting issues",
573 GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION,
574 glib_major_version, glib_minor_version, glib_micro_version);
579 /* we need threading to be enabled right here */
580 g_assert (g_thread_supported ());
584 setlocale (LC_ALL, "");
585 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
586 #endif /* ENABLE_NLS */
588 #ifndef GST_DISABLE_GST_DEBUG
590 const gchar *debug_list;
592 if (g_getenv ("GST_DEBUG_NO_COLOR") != NULL)
593 gst_debug_set_colored (FALSE);
595 debug_list = g_getenv ("GST_DEBUG");
597 parse_debug_list (debug_list);
601 priv_gst_dump_dot_dir = g_getenv ("GST_DEBUG_DUMP_DOT_DIR");
603 /* This is the earliest we can make stuff show up in the logs.
604 * So give some useful info about GStreamer here */
605 GST_INFO ("Initializing GStreamer Core Library version %s", VERSION);
606 GST_INFO ("Using library installed in %s", LIBDIR);
608 /* Print some basic system details if possible (OS/architecture) */
609 #ifdef HAVE_SYS_UTSNAME_H
611 struct utsname sys_details;
613 if (uname (&sys_details) == 0) {
614 GST_INFO ("%s %s %s %s %s", sys_details.sysname,
615 sys_details.nodename, sys_details.release, sys_details.version,
616 sys_details.machine);
625 gst_register_core_elements (GstPlugin * plugin)
627 /* register some standard builtin types */
628 if (!gst_element_register (plugin, "bin", GST_RANK_PRIMARY,
630 !gst_element_register (plugin, "pipeline", GST_RANK_PRIMARY,
633 g_assert_not_reached ();
638 #ifndef GST_DISABLE_REGISTRY
642 REGISTRY_SCAN_AND_UPDATE_FAILURE = 0,
643 REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED,
644 REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED
645 } GstRegistryScanAndUpdateResult;
648 * scan_and_update_registry:
649 * @default_registry: the #GstRegistry
650 * @registry_file: registry filename
651 * @write_changes: write registry if it has changed?
653 * Scans for registry changes and eventually updates the registry cache.
655 * Return: %REGISTRY_SCAN_AND_UPDATE_FAILURE if the registry could not scanned
656 * or updated, %REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED if the
657 * registry is clean and %REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED if
658 * it has been updated and the cache needs to be re-read.
660 static GstRegistryScanAndUpdateResult
661 scan_and_update_registry (GstRegistry * default_registry,
662 const gchar * registry_file, gboolean write_changes, GError ** error)
664 const gchar *plugin_path;
665 gboolean changed = FALSE;
668 GST_INFO ("Validating registry cache: %s", registry_file);
669 /* It sounds tempting to just compare the mtime of directories with the mtime
670 * of the registry cache, but it does not work. It would not catch updated
671 * plugins, which might bring more or less features.
674 /* scan paths specified via --gst-plugin-path */
675 GST_DEBUG ("scanning paths added via --gst-plugin-path");
676 for (l = plugin_paths; l != NULL; l = l->next) {
677 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
678 /* FIXME: add changed |= here as well? */
679 gst_registry_scan_path (default_registry, (gchar *) l->data);
681 /* keep plugin_paths around in case a re-scan is forced later on */
683 /* GST_PLUGIN_PATH specifies a list of directories to scan for
684 * additional plugins. These take precedence over the system plugins */
685 plugin_path = g_getenv ("GST_PLUGIN_PATH");
690 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
691 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
692 for (i = 0; list[i]; i++) {
693 changed |= gst_registry_scan_path (default_registry, list[i]);
697 GST_DEBUG ("GST_PLUGIN_PATH not set");
700 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
701 * loaded by default. If not set, this defaults to the system-installed
702 * path, and the plugins installed in the user's home directory */
703 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
704 if (plugin_path == NULL) {
707 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
709 /* plugins in the user's home directory take precedence over
710 * system-installed ones */
711 home_plugins = g_build_filename (g_get_home_dir (),
712 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
713 GST_DEBUG ("scanning home plugins %s", home_plugins);
714 changed |= gst_registry_scan_path (default_registry, home_plugins);
715 g_free (home_plugins);
717 /* add the main (installed) library path */
718 GST_DEBUG ("scanning main plugins %s", PLUGINDIR);
719 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
724 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
725 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
726 for (i = 0; list[i]; i++) {
727 changed |= gst_registry_scan_path (default_registry, list[i]);
732 /* Remove cached plugins so stale info is cleared. */
733 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
736 GST_INFO ("Registry cache has not changed");
737 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED;
740 if (!write_changes) {
741 GST_INFO ("Registry cache changed, but writing is disabled. Not writing.");
742 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
745 GST_INFO ("Registry cache changed. Writing new registry cache");
746 #ifdef USE_BINARY_REGISTRY
747 if (!gst_registry_binary_write_cache (default_registry, registry_file)) {
749 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
751 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
752 _("Error writing registry cache to %s: %s"),
753 registry_file, g_strerror (errno));
754 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
757 GST_INFO ("Registry cache written successfully");
758 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED;
762 ensure_current_registry_nonforking (GstRegistry * default_registry,
763 const gchar * registry_file, GError ** error)
765 /* fork() not available */
766 GST_DEBUG ("Updating registry cache in-process");
767 scan_and_update_registry (default_registry, registry_file, TRUE, error);
771 /* when forking is not available this function always does nothing but return
774 ensure_current_registry_forking (GstRegistry * default_registry,
775 const gchar * registry_file, GError ** error)
782 /* We fork here, and let the child read and possibly rebuild the registry.
783 * After that, the parent will re-read the freshly generated registry. */
784 GST_DEBUG ("forking to update registry");
786 if (pipe (pfd) == -1) {
787 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
788 _("Error re-scanning registry %s: %s"),
789 ", could not create pipes. Error", g_strerror (errno));
795 GST_ERROR ("Failed to fork()");
796 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
797 _("Error re-scanning registry %s: %s"),
798 ", failed to fork. Error", g_strerror (errno));
805 /* this is the child. Close the read pipe */
806 (void) close (pfd[0]);
808 GST_DEBUG ("child reading registry cache");
810 scan_and_update_registry (default_registry, registry_file, TRUE, NULL);
812 /* need to use _exit, so that any exit handlers registered don't
813 * bring down the main program */
814 GST_DEBUG ("child exiting: %d", result_code);
816 /* make valgrind happy (yes, you can call it insane) */
817 g_free ((char *) registry_file);
819 /* write a result byte to the pipe */
821 ret = write (pfd[1], &result_code, sizeof (result_code));
822 } while (ret == -1 && errno == EINTR);
823 /* if ret == -1 now, we could not write to pipe, probably
824 * means parent has exited before us */
825 (void) close (pfd[1]);
831 /* parent. Close write pipe */
832 (void) close (pfd[1]);
834 /* Wait for result from the pipe */
835 GST_DEBUG ("Waiting for data from child");
837 ret = read (pfd[0], &result_code, sizeof (result_code));
838 } while (ret == -1 && errno == EINTR);
841 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
842 _("Error re-scanning registry %s: %s"),
843 ", read returned error", g_strerror (errno));
847 (void) close (pfd[0]);
849 /* Wait to ensure the child is reaped, but ignore the result */
850 GST_DEBUG ("parent waiting on child");
851 waitpid (pid, NULL, 0);
852 GST_DEBUG ("parent done waiting on child");
855 GST_ERROR ("child did not exit normally, terminated by signal");
856 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
857 _("Error re-scanning registry %s"), ", child terminated by signal");
861 if (result_code == REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED) {
862 GST_DEBUG ("Child succeeded. Parent reading registry cache");
863 _priv_gst_registry_remove_cache_plugins (default_registry);
864 #ifdef USE_BINARY_REGISTRY
865 gst_registry_binary_read_cache (default_registry, registry_file);
867 gst_registry_xml_read_cache (default_registry, registry_file);
869 } else if (result_code == REGISTRY_SCAN_AND_UPDATE_FAILURE) {
870 GST_DEBUG ("Child failed. Parent re-scanning registry, ignoring errors.");
871 scan_and_update_registry (default_registry, registry_file, FALSE, NULL);
874 #endif /* HAVE_FORK */
879 ensure_current_registry (GError ** error)
881 gchar *registry_file;
882 GstRegistry *default_registry;
887 default_registry = gst_registry_get_default ();
888 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
889 if (registry_file == NULL) {
890 #ifdef USE_BINARY_REGISTRY
891 registry_file = g_build_filename (g_get_home_dir (),
892 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".bin", NULL);
894 registry_file = g_build_filename (g_get_home_dir (),
895 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
899 GST_INFO ("reading registry cache: %s", registry_file);
900 #ifdef USE_BINARY_REGISTRY
901 gst_registry_binary_read_cache (default_registry, registry_file);
903 gst_registry_xml_read_cache (default_registry, registry_file);
906 do_update = !_gst_disable_registry_update;
908 const gchar *update_env;
910 if ((update_env = g_getenv ("GST_REGISTRY_UPDATE"))) {
911 /* do update for any value different from "no" */
912 do_update = (strcmp (update_env, "no") != 0);
917 /* first see if forking is enabled */
918 do_fork = _gst_enable_registry_fork;
920 const gchar *fork_env;
922 /* forking enabled, see if it is disabled with an env var */
923 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
924 /* fork enabled for any value different from "no" */
925 do_fork = strcmp (fork_env, "no") != 0;
929 /* now check registry with or without forking */
931 GST_DEBUG ("forking for registry rebuild");
932 ret = ensure_current_registry_forking (default_registry, registry_file,
935 GST_DEBUG ("requested not to fork for registry rebuild");
936 ret = ensure_current_registry_nonforking (default_registry, registry_file,
941 g_free (registry_file);
942 GST_INFO ("registry reading and updating done, result = %d", ret);
946 #endif /* GST_DISABLE_REGISTRY */
950 * - initalization of threads if we use them
953 * - initializes gst_format
954 * - registers a bunch of types for gst_objects
956 * - we don't have cases yet where this fails, but in the future
957 * we might and then it's nice to be able to return that
960 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
965 #ifndef GST_DISABLE_TRACE
967 #endif /* GST_DISABLE_TRACE */
969 if (gst_initialized) {
970 GST_DEBUG ("already initialized");
974 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
975 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
977 _priv_gst_quarks_initialize ();
978 _gst_format_initialize ();
979 _gst_query_initialize ();
980 g_type_class_ref (gst_object_get_type ());
981 g_type_class_ref (gst_pad_get_type ());
982 g_type_class_ref (gst_element_factory_get_type ());
983 g_type_class_ref (gst_element_get_type ());
984 g_type_class_ref (gst_type_find_factory_get_type ());
985 g_type_class_ref (gst_bin_get_type ());
986 g_type_class_ref (gst_bus_get_type ());
987 g_type_class_ref (gst_task_get_type ());
988 g_type_class_ref (gst_clock_get_type ());
990 #ifndef GST_DISABLE_INDEX
991 g_type_class_ref (gst_index_factory_get_type ());
992 #endif /* GST_DISABLE_INDEX */
993 #ifndef GST_DISABLE_URI
994 gst_uri_handler_get_type ();
995 #endif /* GST_DISABLE_URI */
997 #ifndef GST_DISABLE_ENUMTYPES
998 g_type_class_ref (gst_object_flags_get_type ());
999 g_type_class_ref (gst_bin_flags_get_type ());
1000 g_type_class_ref (gst_buffer_flag_get_type ());
1001 g_type_class_ref (gst_buffer_copy_flags_get_type ());
1002 g_type_class_ref (gst_bus_flags_get_type ());
1003 g_type_class_ref (gst_bus_sync_reply_get_type ());
1004 g_type_class_ref (gst_caps_flags_get_type ());
1005 g_type_class_ref (gst_clock_return_get_type ());
1006 g_type_class_ref (gst_clock_entry_type_get_type ());
1007 g_type_class_ref (gst_clock_flags_get_type ());
1008 g_type_class_ref (gst_debug_graph_details_get_type ());
1009 g_type_class_ref (gst_state_get_type ());
1010 g_type_class_ref (gst_state_change_return_get_type ());
1011 g_type_class_ref (gst_state_change_get_type ());
1012 g_type_class_ref (gst_element_flags_get_type ());
1013 g_type_class_ref (gst_core_error_get_type ());
1014 g_type_class_ref (gst_library_error_get_type ());
1015 g_type_class_ref (gst_resource_error_get_type ());
1016 g_type_class_ref (gst_stream_error_get_type ());
1017 g_type_class_ref (gst_event_type_flags_get_type ());
1018 g_type_class_ref (gst_event_type_get_type ());
1019 g_type_class_ref (gst_seek_type_get_type ());
1020 g_type_class_ref (gst_seek_flags_get_type ());
1021 g_type_class_ref (gst_format_get_type ());
1022 g_type_class_ref (gst_index_certainty_get_type ());
1023 g_type_class_ref (gst_index_entry_type_get_type ());
1024 g_type_class_ref (gst_index_lookup_method_get_type ());
1025 g_type_class_ref (gst_assoc_flags_get_type ());
1026 g_type_class_ref (gst_index_resolver_method_get_type ());
1027 g_type_class_ref (gst_index_flags_get_type ());
1028 g_type_class_ref (gst_debug_level_get_type ());
1029 g_type_class_ref (gst_debug_color_flags_get_type ());
1030 g_type_class_ref (gst_iterator_result_get_type ());
1031 g_type_class_ref (gst_iterator_item_get_type ());
1032 g_type_class_ref (gst_message_type_get_type ());
1033 g_type_class_ref (gst_mini_object_flags_get_type ());
1034 g_type_class_ref (gst_pad_link_return_get_type ());
1035 g_type_class_ref (gst_flow_return_get_type ());
1036 g_type_class_ref (gst_activate_mode_get_type ());
1037 g_type_class_ref (gst_pad_direction_get_type ());
1038 g_type_class_ref (gst_pad_flags_get_type ());
1039 g_type_class_ref (gst_pad_presence_get_type ());
1040 g_type_class_ref (gst_pad_template_flags_get_type ());
1041 g_type_class_ref (gst_pipeline_flags_get_type ());
1042 g_type_class_ref (gst_plugin_error_get_type ());
1043 g_type_class_ref (gst_plugin_flags_get_type ());
1044 g_type_class_ref (gst_rank_get_type ());
1045 g_type_class_ref (gst_query_type_get_type ());
1046 g_type_class_ref (gst_buffering_mode_get_type ());
1047 g_type_class_ref (gst_tag_merge_mode_get_type ());
1048 g_type_class_ref (gst_tag_flag_get_type ());
1049 g_type_class_ref (gst_task_state_get_type ());
1050 g_type_class_ref (gst_alloc_trace_flags_get_type ());
1051 g_type_class_ref (gst_type_find_probability_get_type ());
1052 g_type_class_ref (gst_uri_type_get_type ());
1053 g_type_class_ref (gst_parse_error_get_type ());
1054 g_type_class_ref (gst_parse_flags_get_type ());
1057 gst_structure_get_type ();
1058 _gst_value_initialize ();
1059 g_type_class_ref (gst_param_spec_fraction_get_type ());
1060 gst_caps_get_type ();
1061 _gst_event_initialize ();
1062 _gst_buffer_initialize ();
1063 _gst_message_initialize ();
1064 _gst_tag_initialize ();
1066 _gst_plugin_initialize ();
1068 gst_g_error_get_type ();
1070 /* register core plugins */
1071 gst_plugin_register_static (GST_VERSION_MAJOR, GST_VERSION_MINOR,
1072 "staticelements", "core elements linked into the GStreamer library",
1073 gst_register_core_elements, VERSION, GST_LICENSE, PACKAGE,
1074 GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
1077 * Any errors happening below this point are non-fatal, we therefore mark
1078 * gstreamer as being initialized, since it is the case from a plugin point of
1081 * If anything fails, it will be put back to FALSE in gst_init_check().
1082 * This allows some special plugins that would call gst_init() to not cause a
1083 * looping effect (i.e. initializing GStreamer twice).
1085 gst_initialized = TRUE;
1087 #ifndef GST_DISABLE_REGISTRY
1088 if (!ensure_current_registry (error))
1090 #endif /* GST_DISABLE_REGISTRY */
1092 /* if we need to preload plugins, do so now */
1093 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1094 /* keep preload_plugins around in case a re-scan is forced later on */
1096 #ifndef GST_DISABLE_TRACE
1098 if (_gst_trace_on) {
1099 gst_trace = gst_trace_new ("gst.trace", 1024);
1100 gst_trace_set_default (gst_trace);
1102 #endif /* GST_DISABLE_TRACE */
1107 #ifndef GST_DISABLE_GST_DEBUG
1109 select_all (GstPlugin * plugin, gpointer user_data)
1115 sort_by_category_name (gconstpointer a, gconstpointer b)
1117 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
1118 gst_debug_category_get_name ((GstDebugCategory *) b));
1122 gst_debug_help (void)
1124 GSList *list, *walk;
1127 /* Need to ensure the registry is loaded to get debug categories */
1128 if (!init_post (NULL, NULL, NULL, NULL))
1131 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
1132 select_all, FALSE, NULL);
1134 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
1135 for (g = list2; g; g = g_list_next (g)) {
1136 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
1138 gst_plugin_load (plugin);
1140 g_list_free (list2);
1142 list = gst_debug_get_all_categories ();
1143 walk = list = g_slist_sort (list, sort_by_category_name);
1146 g_print ("name level description\n");
1147 g_print ("---------------------+--------+--------------------------------\n");
1150 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
1152 if (gst_debug_is_colored ()) {
1153 gchar *color = gst_debug_construct_term_color (cat->color);
1155 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
1157 gst_debug_category_get_name (cat),
1158 gst_debug_category_get_threshold (cat),
1159 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1160 color, gst_debug_category_get_description (cat));
1163 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
1164 gst_debug_category_get_threshold (cat),
1165 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1166 gst_debug_category_get_description (cat));
1168 walk = g_slist_next (walk);
1170 g_slist_free (list);
1175 #ifndef GST_DISABLE_OPTION_PARSING
1177 parse_one_option (gint opt, const gchar * arg, GError ** err)
1181 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
1183 case ARG_FATAL_WARNINGS:{
1184 GLogLevelFlags fatal_mask;
1186 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1187 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1188 g_log_set_always_fatal (fatal_mask);
1191 #ifndef GST_DISABLE_GST_DEBUG
1192 case ARG_DEBUG_LEVEL:{
1195 tmp = strtol (arg, NULL, 0);
1196 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1197 gst_debug_set_default_threshold (tmp);
1202 parse_debug_list (arg);
1204 case ARG_DEBUG_NO_COLOR:
1205 gst_debug_set_colored (FALSE);
1207 case ARG_DEBUG_DISABLE:
1208 gst_debug_set_active (FALSE);
1210 case ARG_DEBUG_HELP:
1214 case ARG_PLUGIN_SPEW:
1216 case ARG_PLUGIN_PATH:
1217 #ifndef GST_DISABLE_REGISTRY
1218 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1219 #endif /* GST_DISABLE_REGISTRY */
1221 case ARG_PLUGIN_LOAD:
1222 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1224 case ARG_SEGTRAP_DISABLE:
1225 _gst_disable_segtrap = TRUE;
1227 case ARG_REGISTRY_UPDATE_DISABLE:
1228 _gst_disable_registry_update = TRUE;
1230 case ARG_REGISTRY_FORK_DISABLE:
1231 _gst_enable_registry_fork = FALSE;
1234 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1235 _("Unknown option"));
1243 parse_goption_arg (const gchar * opt,
1244 const gchar * arg, gpointer data, GError ** err)
1252 "--gst-version", ARG_VERSION}, {
1253 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1254 #ifndef GST_DISABLE_GST_DEBUG
1256 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1257 "--gst-debug", ARG_DEBUG}, {
1258 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1259 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1260 "--gst-debug-help", ARG_DEBUG_HELP},
1263 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1264 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1265 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1266 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1267 "--gst-disable-registry-update", ARG_REGISTRY_UPDATE_DISABLE}, {
1268 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1273 for (n = 0; options[n].opt; n++) {
1274 if (!strcmp (opt, options[n].opt)) {
1275 val = options[n].val;
1280 return parse_one_option (val, arg, err);
1284 extern GstRegistry *_gst_registry_default;
1289 * Clean up any resources created by GStreamer in gst_init().
1291 * It is normally not needed to call this function in a normal application
1292 * as the resources will automatically be freed when the program terminates.
1293 * This function is therefore mostly used by testsuites and other memory
1296 * After this call GStreamer (including this method) should not be used anymore.
1303 GST_INFO ("deinitializing GStreamer");
1305 if (gst_deinitialized) {
1306 GST_DEBUG ("already deinitialized");
1310 g_slist_foreach (preload_plugins, (GFunc) g_free, NULL);
1311 g_slist_free (preload_plugins);
1312 preload_plugins = NULL;
1314 #ifndef GST_DISABLE_REGISTRY
1315 g_list_foreach (plugin_paths, (GFunc) g_free, NULL);
1316 g_list_free (plugin_paths);
1317 plugin_paths = NULL;
1320 clock = gst_system_clock_obtain ();
1321 gst_object_unref (clock);
1322 gst_object_unref (clock);
1324 _priv_gst_registry_cleanup ();
1326 g_type_class_unref (g_type_class_peek (gst_object_get_type ()));
1327 g_type_class_unref (g_type_class_peek (gst_pad_get_type ()));
1328 g_type_class_unref (g_type_class_peek (gst_element_factory_get_type ()));
1329 g_type_class_unref (g_type_class_peek (gst_element_get_type ()));
1330 g_type_class_unref (g_type_class_peek (gst_type_find_factory_get_type ()));
1331 g_type_class_unref (g_type_class_peek (gst_bin_get_type ()));
1332 g_type_class_unref (g_type_class_peek (gst_bus_get_type ()));
1333 g_type_class_unref (g_type_class_peek (gst_task_get_type ()));
1334 #ifndef GST_DISABLE_INDEX
1335 g_type_class_unref (g_type_class_peek (gst_index_factory_get_type ()));
1336 #endif /* GST_DISABLE_INDEX */
1337 #ifndef GST_DISABLE_ENUMTYPES
1338 g_type_class_unref (g_type_class_peek (gst_object_flags_get_type ()));
1339 g_type_class_unref (g_type_class_peek (gst_bin_flags_get_type ()));
1340 g_type_class_unref (g_type_class_peek (gst_buffer_flag_get_type ()));
1341 g_type_class_unref (g_type_class_peek (gst_buffer_copy_flags_get_type ()));
1342 g_type_class_unref (g_type_class_peek (gst_bus_flags_get_type ()));
1343 g_type_class_unref (g_type_class_peek (gst_bus_sync_reply_get_type ()));
1344 g_type_class_unref (g_type_class_peek (gst_caps_flags_get_type ()));
1345 g_type_class_unref (g_type_class_peek (gst_clock_return_get_type ()));
1346 g_type_class_unref (g_type_class_peek (gst_clock_entry_type_get_type ()));
1347 g_type_class_unref (g_type_class_peek (gst_clock_flags_get_type ()));
1348 g_type_class_unref (g_type_class_peek (gst_debug_graph_details_get_type ()));
1349 g_type_class_unref (g_type_class_peek (gst_state_get_type ()));
1350 g_type_class_unref (g_type_class_peek (gst_state_change_return_get_type ()));
1351 g_type_class_unref (g_type_class_peek (gst_state_change_get_type ()));
1352 g_type_class_unref (g_type_class_peek (gst_element_flags_get_type ()));
1353 g_type_class_unref (g_type_class_peek (gst_core_error_get_type ()));
1354 g_type_class_unref (g_type_class_peek (gst_library_error_get_type ()));
1355 g_type_class_unref (g_type_class_peek (gst_resource_error_get_type ()));
1356 g_type_class_unref (g_type_class_peek (gst_stream_error_get_type ()));
1357 g_type_class_unref (g_type_class_peek (gst_event_type_flags_get_type ()));
1358 g_type_class_unref (g_type_class_peek (gst_event_type_get_type ()));
1359 g_type_class_unref (g_type_class_peek (gst_seek_type_get_type ()));
1360 g_type_class_unref (g_type_class_peek (gst_seek_flags_get_type ()));
1361 g_type_class_unref (g_type_class_peek (gst_format_get_type ()));
1362 g_type_class_unref (g_type_class_peek (gst_index_certainty_get_type ()));
1363 g_type_class_unref (g_type_class_peek (gst_index_entry_type_get_type ()));
1364 g_type_class_unref (g_type_class_peek (gst_index_lookup_method_get_type ()));
1365 g_type_class_unref (g_type_class_peek (gst_assoc_flags_get_type ()));
1366 g_type_class_unref (g_type_class_peek (gst_index_resolver_method_get_type
1368 g_type_class_unref (g_type_class_peek (gst_index_flags_get_type ()));
1369 g_type_class_unref (g_type_class_peek (gst_debug_level_get_type ()));
1370 g_type_class_unref (g_type_class_peek (gst_debug_color_flags_get_type ()));
1371 g_type_class_unref (g_type_class_peek (gst_iterator_result_get_type ()));
1372 g_type_class_unref (g_type_class_peek (gst_iterator_item_get_type ()));
1373 g_type_class_unref (g_type_class_peek (gst_message_type_get_type ()));
1374 g_type_class_unref (g_type_class_peek (gst_mini_object_flags_get_type ()));
1375 g_type_class_unref (g_type_class_peek (gst_pad_link_return_get_type ()));
1376 g_type_class_unref (g_type_class_peek (gst_flow_return_get_type ()));
1377 g_type_class_unref (g_type_class_peek (gst_activate_mode_get_type ()));
1378 g_type_class_unref (g_type_class_peek (gst_pad_direction_get_type ()));
1379 g_type_class_unref (g_type_class_peek (gst_pad_flags_get_type ()));
1380 g_type_class_unref (g_type_class_peek (gst_pad_presence_get_type ()));
1381 g_type_class_unref (g_type_class_peek (gst_pad_template_flags_get_type ()));
1382 g_type_class_unref (g_type_class_peek (gst_pipeline_flags_get_type ()));
1383 g_type_class_unref (g_type_class_peek (gst_plugin_error_get_type ()));
1384 g_type_class_unref (g_type_class_peek (gst_plugin_flags_get_type ()));
1385 g_type_class_unref (g_type_class_peek (gst_rank_get_type ()));
1386 g_type_class_unref (g_type_class_peek (gst_query_type_get_type ()));
1387 g_type_class_unref (g_type_class_peek (gst_buffering_mode_get_type ()));
1388 g_type_class_unref (g_type_class_peek (gst_tag_merge_mode_get_type ()));
1389 g_type_class_unref (g_type_class_peek (gst_tag_flag_get_type ()));
1390 g_type_class_unref (g_type_class_peek (gst_task_state_get_type ()));
1391 g_type_class_unref (g_type_class_peek (gst_alloc_trace_flags_get_type ()));
1392 g_type_class_unref (g_type_class_peek (gst_type_find_probability_get_type
1394 g_type_class_unref (g_type_class_peek (gst_uri_type_get_type ()));
1395 g_type_class_unref (g_type_class_peek (gst_parse_error_get_type ()));
1397 g_type_class_unref (g_type_class_peek (gst_param_spec_fraction_get_type ()));
1399 gst_deinitialized = TRUE;
1400 GST_INFO ("deinitialized GStreamer");
1405 * @major: pointer to a guint to store the major version number
1406 * @minor: pointer to a guint to store the minor version number
1407 * @micro: pointer to a guint to store the micro version number
1408 * @nano: pointer to a guint to store the nano version number
1410 * Gets the version number of the GStreamer library.
1413 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1415 g_return_if_fail (major);
1416 g_return_if_fail (minor);
1417 g_return_if_fail (micro);
1418 g_return_if_fail (nano);
1420 *major = GST_VERSION_MAJOR;
1421 *minor = GST_VERSION_MINOR;
1422 *micro = GST_VERSION_MICRO;
1423 *nano = GST_VERSION_NANO;
1427 * gst_version_string:
1429 * This function returns a string that is useful for describing this version
1430 * of GStreamer to the outside world: user agent strings, logging, ...
1432 * Returns: a newly allocated string describing this version of GStreamer.
1436 gst_version_string ()
1438 guint major, minor, micro, nano;
1440 gst_version (&major, &minor, µ, &nano);
1442 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1444 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1446 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1451 * gst_segtrap_is_enabled:
1453 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1454 * to better catch and report errors to the application. Currently this feature
1455 * is enabled by default when loading plugins.
1457 * Applications might want to disable this behaviour with the
1458 * gst_segtrap_set_enabled() function. This is typically done if the application
1459 * wants to install its own handler without GStreamer interfering.
1461 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1466 gst_segtrap_is_enabled (void)
1468 /* yeps, it's enabled when it's not disabled */
1469 return !_gst_disable_segtrap;
1473 * gst_segtrap_set_enabled:
1474 * @enabled: whether a custom SIGSEGV handler should be installed.
1476 * Applications might want to disable/enable the SIGSEGV handling of
1477 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1482 gst_segtrap_set_enabled (gboolean enabled)
1484 _gst_disable_segtrap = !enabled;
1488 * gst_registry_fork_is_enabled:
1490 * By default GStreamer will perform a fork() when scanning and rebuilding the
1493 * Applications might want to disable this behaviour with the
1494 * gst_registry_fork_set_enabled() function.
1496 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1497 * platforms without fork(), this function will always return %FALSE.
1502 gst_registry_fork_is_enabled (void)
1504 return _gst_enable_registry_fork;
1508 * gst_registry_fork_set_enabled:
1509 * @enabled: whether rebuilding the registry may fork
1511 * Applications might want to disable/enable the usage of fork() when rebuilding
1512 * the registry. See gst_registry_fork_is_enabled() for more information.
1514 * On platforms without fork(), this function will have no effect on the return
1515 * value of gst_registry_fork_is_enabled().
1520 gst_registry_fork_set_enabled (gboolean enabled)
1523 _gst_enable_registry_fork = enabled;
1524 #endif /* HAVE_FORK */
1529 * gst_update_registry:
1531 * Forces GStreamer to re-scan its plugin paths and update the default
1534 * Applications will almost never need to call this function, it is only
1535 * useful if the application knows new plugins have been installed (or old
1536 * ones removed) since the start of the application (or, to be precise, the
1537 * first call to gst_init()) and the application wants to make use of any
1538 * newly-installed plugins without restarting the application.
1540 * Applications should assume that the registry update is neither atomic nor
1541 * thread-safe and should therefore not have any dynamic pipelines running
1542 * (including the playbin and decodebin elements) and should also not create
1543 * any elements or access the GStreamer registry while the update is in
1546 * Note that this function may block for a significant amount of time.
1548 * Returns: %TRUE if the registry has been updated successfully (does not
1549 * imply that there were changes), otherwise %FALSE.
1554 gst_update_registry (void)
1556 gboolean res = FALSE;
1558 #ifndef GST_DISABLE_REGISTRY
1561 res = ensure_current_registry (&err);
1563 GST_WARNING ("registry update failed: %s", err->message);
1566 GST_LOG ("registry update succeeded");
1569 if (preload_plugins) {
1570 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1573 GST_WARNING ("registry update failed: %s", "registry disabled");
1574 #endif /* GST_DISABLE_REGISTRY */