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 * ctx = g_option_context_new ("gst-launch");
80 * g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
81 * g_option_context_add_group (ctx, gst_init_get_option_group ());
82 * if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
83 * g_print ("Error initializing: %s\n", GST_STR_NULL (err->message));
86 * g_option_context_free (ctx);
92 * Use gst_version() to query the library version at runtime or use the
93 * GST_VERSION_* macros to find the version at compile time. Optionally
94 * gst_version_string() returns a printable string.
96 * The gst_deinit() call is used to clean up all internal resources used
97 * by <application>GStreamer</application>. It is mostly used in unit tests
100 * Last reviewed on 2006-08-11 (0.10.10)
103 #include "gst_private.h"
106 #include <sys/types.h>
108 #include <sys/wait.h>
109 #endif /* HAVE_FORK */
112 #include "gst-i18n-lib.h"
113 #include <locale.h> /* for LC_ALL */
117 #define GST_CAT_DEFAULT GST_CAT_GST_INIT
119 #define MAX_PATH_SPLIT 16
120 #define GST_PLUGIN_SEPARATOR ","
122 static gboolean gst_initialized = FALSE;
124 #ifndef GST_DISABLE_REGISTRY
125 static GList *plugin_paths = NULL; /* for delayed processing in post_init */
128 extern gint _gst_trace_on;
132 #define DEFAULT_FORK TRUE
134 #define DEFAULT_FORK FALSE
135 #endif /* HAVE_FORK */
137 /* set to TRUE when segfaults need to be left as is, FIXME, this variable is
139 gboolean _gst_disable_segtrap = FALSE;
141 /* control the behaviour of registry rebuild */
142 static gboolean _gst_enable_registry_fork = DEFAULT_FORK;
144 static void load_plugin_func (gpointer data, gpointer user_data);
145 static gboolean init_pre (GOptionContext * context, GOptionGroup * group,
146 gpointer data, GError ** error);
147 static gboolean init_post (GOptionContext * context, GOptionGroup * group,
148 gpointer data, GError ** error);
149 static gboolean parse_goption_arg (const gchar * s_opt,
150 const gchar * arg, gpointer data, GError ** err);
152 static GSList *preload_plugins = NULL;
154 const gchar g_log_domain_gstreamer[] = "GStreamer";
157 debug_log_handler (const gchar * log_domain,
158 GLogLevelFlags log_level, const gchar * message, gpointer user_data)
160 g_log_default_handler (log_domain, log_level, message, user_data);
161 /* FIXME: do we still need this ? fatal errors these days are all
162 * other than core errors */
163 /* g_on_error_query (NULL); */
170 #ifndef GST_DISABLE_GST_DEBUG
181 ARG_REGISTRY_FORK_DISABLE
184 /* debug-spec ::= category-spec [, category-spec]*
185 * category-spec ::= category:val | val
194 #ifndef GST_DISABLE_GST_DEBUG
196 parse_debug_category (gchar * str, const gchar ** category)
213 parse_debug_level (gchar * str, gint * level)
221 if (str[0] != NUL && str[1] == NUL
222 && str[0] >= '0' && str[0] < '0' + GST_LEVEL_COUNT) {
223 *level = str[0] - '0';
231 parse_debug_list (const gchar * list)
236 g_return_if_fail (list != NULL);
238 split = g_strsplit (list, ",", 0);
240 for (walk = split; *walk; walk++) {
241 if (strchr (*walk, ':')) {
242 gchar **values = g_strsplit (*walk, ":", 2);
244 if (values[0] && values[1]) {
246 const gchar *category;
248 if (parse_debug_category (values[0], &category)
249 && parse_debug_level (values[1], &level))
250 gst_debug_set_threshold_for_name (category, level);
257 if (parse_debug_level (*walk, &level))
258 gst_debug_set_default_threshold (level);
267 * gst_init_get_option_group:
269 * Returns a #GOptionGroup with GStreamer's argument specifications. The
270 * group is set up to use standard GOption callbacks, so when using this
271 * group in combination with GOption parsing methods, all argument parsing
272 * and initialization is automated.
274 * This function is useful if you want to integrate GStreamer with other
275 * libraries that use GOption (see g_option_context_add_group() ).
277 * Returns: a pointer to GStreamer's option group. Should be dereferenced
282 gst_init_get_option_group (void)
285 const static GOptionEntry gst_args[] = {
286 {"gst-version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
287 (gpointer) parse_goption_arg, N_("Print the GStreamer version"), NULL},
288 {"gst-fatal-warnings", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
289 (gpointer) parse_goption_arg, N_("Make all warnings fatal"), NULL},
290 #ifndef GST_DISABLE_GST_DEBUG
291 {"gst-debug-help", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
292 (gpointer) parse_goption_arg,
293 N_("Print available debug categories and exit"),
295 {"gst-debug-level", 0, 0, G_OPTION_ARG_CALLBACK,
296 (gpointer) parse_goption_arg,
297 N_("Default debug level from 1 (only error) to 5 (anything) or "
300 {"gst-debug", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) parse_goption_arg,
301 N_("Comma-separated list of category_name:level pairs to set "
302 "specific levels for the individual categories. Example: "
303 "GST_AUTOPLUG:5,GST_ELEMENT_*:3"),
305 {"gst-debug-no-color", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
306 (gpointer) parse_goption_arg, N_("Disable colored debugging output"),
308 {"gst-debug-disable", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
309 (gpointer) parse_goption_arg, N_("Disable debugging"), NULL},
311 {"gst-plugin-spew", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
312 (gpointer) parse_goption_arg,
313 N_("Enable verbose plugin loading diagnostics"),
315 {"gst-plugin-path", 0, 0, G_OPTION_ARG_CALLBACK,
316 (gpointer) parse_goption_arg,
317 N_("Colon-separated paths containing plugins"), N_("PATHS")},
318 {"gst-plugin-load", 0, 0, G_OPTION_ARG_CALLBACK,
319 (gpointer) parse_goption_arg,
320 N_("Comma-separated list of plugins to preload in addition to the "
321 "list stored in environment variable GST_PLUGIN_PATH"),
323 {"gst-disable-segtrap", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
324 (gpointer) parse_goption_arg,
325 N_("Disable trapping of segmentation faults during plugin loading"),
327 {"gst-disable-registry-fork", 0, G_OPTION_FLAG_NO_ARG,
328 G_OPTION_ARG_CALLBACK,
329 (gpointer) parse_goption_arg,
330 N_("Disable the use of fork() while scanning the registry"),
335 group = g_option_group_new ("gst", _("GStreamer Options"),
336 _("Show GStreamer Options"), NULL, NULL);
337 g_option_group_set_parse_hooks (group, (GOptionParseFunc) init_pre,
338 (GOptionParseFunc) init_post);
340 g_option_group_add_entries (group, gst_args);
341 g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
348 * @argc: pointer to application's argc
349 * @argv: pointer to application's argv
350 * @err: pointer to a #GError to which a message will be posted on error
352 * Initializes the GStreamer library, setting up internal path lists,
353 * registering built-in elements, and loading standard plugins.
355 * This function will return %FALSE if GStreamer could not be initialized
356 * for some reason. If you want your program to fail fatally,
357 * use gst_init() instead.
359 * Returns: %TRUE if GStreamer could be initialized.
362 gst_init_check (int *argc, char **argv[], GError ** err)
368 GST_INFO ("initializing GStreamer");
370 if (gst_initialized) {
371 GST_DEBUG ("already initialized gst");
375 ctx = g_option_context_new ("- GStreamer initialization");
376 g_option_context_set_ignore_unknown_options (ctx, TRUE);
377 group = gst_init_get_option_group ();
378 g_option_context_add_group (ctx, group);
379 res = g_option_context_parse (ctx, argc, argv, err);
380 g_option_context_free (ctx);
382 gst_initialized = res;
385 GST_INFO ("initialized GStreamer successfully");
387 GST_INFO ("failed to initialize GStreamer");
395 * @argc: pointer to application's argc
396 * @argv: pointer to application's argv
398 * Initializes the GStreamer library, setting up internal path lists,
399 * registering built-in elements, and loading standard plugins.
402 * This function will terminate your program if it was unable to initialize
403 * GStreamer for some reason. If you want your program to fall back,
404 * use gst_init_check() instead.
407 * WARNING: This function does not work in the same way as corresponding
408 * functions in other glib-style libraries, such as gtk_init(). In
409 * particular, unknown command line options cause this function to
410 * abort program execution.
413 gst_init (int *argc, char **argv[])
417 if (!gst_init_check (argc, argv, &err)) {
418 g_print ("Could not initialize GStreamer: %s\n",
419 err ? err->message : "unknown error occurred");
427 #ifndef GST_DISABLE_REGISTRY
429 add_path_func (gpointer data, gpointer user_data)
431 GST_INFO ("Adding plugin path: \"%s\", will scan later", (gchar *) data);
432 plugin_paths = g_list_append (plugin_paths, g_strdup (data));
437 prepare_for_load_plugin_func (gpointer data, gpointer user_data)
439 preload_plugins = g_slist_prepend (preload_plugins, g_strdup (data));
443 load_plugin_func (gpointer data, gpointer user_data)
446 const gchar *filename;
449 filename = (const gchar *) data;
451 plugin = gst_plugin_load_file (filename, &err);
454 GST_INFO ("Loaded plugin: \"%s\"", filename);
456 gst_default_registry_add_plugin (plugin);
459 /* Report error to user, and free error */
460 GST_ERROR ("Failed to load plugin: %s\n", err->message);
463 GST_WARNING ("Failed to load plugin: \"%s\"", filename);
471 split_and_iterate (const gchar * stringlist, gchar * separator, GFunc iterator,
476 gchar *lastlist = g_strdup (stringlist);
479 strings = g_strsplit (lastlist, separator, MAX_PATH_SPLIT);
484 iterator (strings[j], user_data);
485 if (++j == MAX_PATH_SPLIT) {
486 lastlist = g_strdup (strings[j]);
491 g_strfreev (strings);
495 /* we have no fail cases yet, but maybe in the future */
497 init_pre (GOptionContext * context, GOptionGroup * group, gpointer data,
500 /* GStreamer was built against a GLib >= 2.8 and is therefore not doing
501 * the refcount hack. Check that it isn't being run against an older GLib */
502 if (glib_major_version < 2 ||
503 (glib_major_version == 2 && glib_minor_version < 8)) {
504 g_warning ("GStreamer was compiled against GLib %d.%d.%d but is running"
505 " against %d.%d.%d. This will cause reference counting issues",
506 GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION,
507 glib_major_version, glib_minor_version, glib_micro_version);
512 if (g_thread_supported ()) {
513 /* somebody already initialized threading */
515 g_thread_init (NULL);
517 /* we need threading to be enabled right here */
521 setlocale (LC_ALL, "");
522 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
523 #endif /* ENABLE_NLS */
525 #ifndef GST_DISABLE_GST_DEBUG
527 const gchar *debug_list;
529 if (g_getenv ("GST_DEBUG_NO_COLOR") != NULL)
530 gst_debug_set_colored (FALSE);
532 debug_list = g_getenv ("GST_DEBUG");
534 parse_debug_list (debug_list);
538 /* This is the earliest we can make stuff show up in the logs.
539 * So give some useful info about GStreamer here */
540 GST_INFO ("Initializing GStreamer Core Library version %s", VERSION);
541 GST_INFO ("Using library installed in %s", LIBDIR);
547 gst_register_core_elements (GstPlugin * plugin)
549 /* register some standard builtin types */
550 if (!gst_element_register (plugin, "bin", GST_RANK_PRIMARY,
552 !gst_element_register (plugin, "pipeline", GST_RANK_PRIMARY,
555 g_assert_not_reached ();
560 static GstPluginDesc plugin_desc = {
564 "core elements linked into the GStreamer library",
565 gst_register_core_elements,
575 #ifndef GST_DISABLE_REGISTRY
578 * scan_and_update_registry:
579 * @default_registry: the #GstRegistry
580 * @registry_file: registry filename
581 * @write_changes: write registry if it has changed?
583 * Scans for registry changes and evntualy updates the registry cache.
585 * Return: %TRUE if the registry could be updated
588 scan_and_update_registry (GstRegistry * default_registry,
589 const gchar * registry_file, gboolean write_changes, GError ** error)
591 const gchar *plugin_path;
592 gboolean changed = FALSE;
595 GST_DEBUG ("reading registry cache: %s", registry_file);
596 gst_registry_xml_read_cache (default_registry, registry_file);
598 /* scan paths specified via --gst-plugin-path */
599 GST_DEBUG ("scanning paths added via --gst-plugin-path");
600 for (l = plugin_paths; l != NULL; l = l->next) {
601 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
602 /* CHECKME: add changed |= here as well? */
603 gst_registry_scan_path (default_registry, (gchar *) l->data);
606 g_list_free (plugin_paths);
609 /* GST_PLUGIN_PATH specifies a list of directories to scan for
610 * additional plugins. These take precedence over the system plugins */
611 plugin_path = g_getenv ("GST_PLUGIN_PATH");
616 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
617 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
618 for (i = 0; list[i]; i++) {
619 changed |= gst_registry_scan_path (default_registry, list[i]);
623 GST_DEBUG ("GST_PLUGIN_PATH not set");
626 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
627 * loaded by default. If not set, this defaults to the system-installed
628 * path, and the plugins installed in the user's home directory */
629 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
630 if (plugin_path == NULL) {
633 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
635 /* plugins in the user's home directory take precedence over
636 * system-installed ones */
637 home_plugins = g_build_filename (g_get_home_dir (),
638 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
639 changed |= gst_registry_scan_path (default_registry, home_plugins);
640 g_free (home_plugins);
642 /* add the main (installed) library path */
643 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
648 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
649 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
650 for (i = 0; list[i]; i++) {
651 changed |= gst_registry_scan_path (default_registry, list[i]);
656 /* Remove cached plugins so stale info is cleared. */
657 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
660 GST_INFO ("Registry cache has not changed");
664 if (!write_changes) {
665 GST_INFO ("Registry cached changed, but writing is disabled. Not writing.");
669 GST_INFO ("Registry cache changed. Writing new registry cache");
670 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
671 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
672 _("Error writing registry cache to %s: %s"),
673 registry_file, g_strerror (errno));
677 GST_INFO ("Registry cache written successfully");
682 ensure_current_registry_nonforking (GstRegistry * default_registry,
683 const gchar * registry_file, GError ** error)
685 /* fork() not available */
686 GST_DEBUG ("Updating registry cache in-process");
687 scan_and_update_registry (default_registry, registry_file, TRUE, error);
691 /* when forking is not available this function always does nothing but return
694 ensure_current_registry_forking (GstRegistry * default_registry,
695 const gchar * registry_file, GError ** error)
701 /* We fork here, and let the child read and possibly rebuild the registry.
702 * After that, the parent will re-read the freshly generated registry. */
703 GST_DEBUG ("forking to update registry");
705 if (pipe (pfd) == -1) {
706 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
707 _("Error re-scanning registry %s: %s"),
708 ", could not create pipes. Error", g_strerror (errno));
714 GST_ERROR ("Failed to fork()");
715 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
716 _("Error re-scanning registry %s: %s"),
717 ", failed to fork. Error", g_strerror (errno));
725 /* this is the child. Close the read pipe */
728 GST_DEBUG ("child reading registry cache");
730 scan_and_update_registry (default_registry, registry_file, TRUE, NULL);
732 /* need to use _exit, so that any exit handlers registered don't
733 * bring down the main program */
734 GST_DEBUG ("child exiting: %s", (res) ? "SUCCESS" : "FAILURE");
736 /* make valgrind happy (yes, you can call it insane) */
737 g_free ((char *) registry_file);
739 /* write a result byte to the pipe */
740 res_byte = res ? '1' : '0';
741 if (write (pfd[1], &res_byte, 1) != 1 || close (pfd[1]) != 0) {
742 /* could not write to pipe, probably means parent has exited before us */
749 /* parent. Close write pipe */
752 /* Wait for result from the pipe */
753 GST_DEBUG ("Waiting for data from child");
754 ret = read (pfd[0], &res_byte, 1);
756 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
757 _("Error re-scanning registry %s: %s"),
758 ", read returned error", g_strerror (errno));
764 /* Wait to ensure the child is reaped, but ignore the result */
765 GST_DEBUG ("parent waiting on child");
766 waitpid (pid, NULL, 0);
767 GST_DEBUG ("parent done waiting on child");
770 GST_ERROR ("child did not exit normally, terminated by signal");
771 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
772 _("Error re-scanning registry %s"), ", child terminated by signal");
776 if (res_byte == '1') {
777 GST_DEBUG ("Child succeeded. Parent reading registry cache");
778 gst_registry_xml_read_cache (default_registry, registry_file);
780 GST_DEBUG ("Child failed. Parent re-scanning registry, ignoring errors.");
781 scan_and_update_registry (default_registry, registry_file, FALSE, NULL);
784 #endif /* HAVE_FORK */
789 ensure_current_registry (GError ** error)
792 GstRegistry *default_registry;
796 default_registry = gst_registry_get_default ();
797 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
798 if (registry_file == NULL) {
799 registry_file = g_build_filename (g_get_home_dir (),
800 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
803 /* first see if forking is enabled */
804 do_fork = _gst_enable_registry_fork;
806 const gchar *fork_env;
808 /* forking enabled, see if it is disabled with an env var */
809 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
810 /* fork enabled for any value different from "no" */
811 do_fork = strcmp (fork_env, "no") != 0;
815 /* now check registry with or without forking */
817 GST_DEBUG ("forking for registry rebuild");
818 ret = ensure_current_registry_forking (default_registry, registry_file,
821 GST_DEBUG ("requested not to fork for registry rebuild");
822 ret = ensure_current_registry_nonforking (default_registry, registry_file,
826 g_free (registry_file);
830 #endif /* GST_DISABLE_REGISTRY */
834 * - initalization of threads if we use them
837 * - initializes gst_format
838 * - registers a bunch of types for gst_objects
840 * - we don't have cases yet where this fails, but in the future
841 * we might and then it's nice to be able to return that
844 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
849 #ifndef GST_DISABLE_TRACE
851 #endif /* GST_DISABLE_TRACE */
853 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
854 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
856 _priv_gst_quarks_initialize ();
857 _gst_format_initialize ();
858 _gst_query_initialize ();
859 gst_object_get_type ();
861 gst_element_factory_get_type ();
862 gst_element_get_type ();
863 gst_type_find_factory_get_type ();
866 #ifndef GST_DISABLE_INDEX
867 gst_index_factory_get_type ();
868 #endif /* GST_DISABLE_INDEX */
869 #ifndef GST_DISABLE_URI
870 gst_uri_handler_get_type ();
871 #endif /* GST_DISABLE_URI */
873 gst_structure_get_type ();
874 _gst_value_initialize ();
875 gst_caps_get_type ();
876 _gst_event_initialize ();
877 _gst_buffer_initialize ();
878 _gst_message_initialize ();
879 _gst_tag_initialize ();
881 /* register core plugins */
882 _gst_plugin_register_static (&plugin_desc);
884 _gst_plugin_initialize ();
887 * Any errors happening below this point are non-fatal, we therefore mark
888 * gstreamer as being initialized, since it is the case from a plugin point of
891 * If anything fails, it will be put back to FALSE in gst_init_check().
892 * This allows some special plugins that would call gst_init() to not cause a
893 * looping effect (i.e. initializing GStreamer twice).
895 gst_initialized = TRUE;
897 #ifndef GST_DISABLE_REGISTRY
898 if (!ensure_current_registry (error))
900 #endif /* GST_DISABLE_REGISTRY */
902 /* if we need to preload plugins */
903 if (preload_plugins) {
904 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
905 g_slist_free (preload_plugins);
906 preload_plugins = NULL;
908 #ifndef GST_DISABLE_TRACE
911 gst_trace = gst_trace_new ("gst.trace", 1024);
912 gst_trace_set_default (gst_trace);
914 #endif /* GST_DISABLE_TRACE */
919 #ifndef GST_DISABLE_GST_DEBUG
921 select_all (GstPlugin * plugin, gpointer user_data)
927 sort_by_category_name (gconstpointer a, gconstpointer b)
929 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
930 gst_debug_category_get_name ((GstDebugCategory *) b));
933 gst_debug_help (void)
938 /* Need to ensure the registry is loaded to get debug categories */
939 if (!init_post (NULL, NULL, NULL, NULL))
942 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
943 select_all, FALSE, NULL);
945 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
946 for (g = list2; g; g = g_list_next (g)) {
947 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
949 gst_plugin_load (plugin);
953 list = gst_debug_get_all_categories ();
954 walk = list = g_slist_sort (list, sort_by_category_name);
957 g_print ("name level description\n");
958 g_print ("---------------------+--------+--------------------------------\n");
961 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
963 if (gst_debug_is_colored ()) {
964 gchar *color = gst_debug_construct_term_color (cat->color);
966 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
968 gst_debug_category_get_name (cat),
969 gst_debug_category_get_threshold (cat),
970 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
971 color, gst_debug_category_get_description (cat));
974 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
975 gst_debug_category_get_threshold (cat),
976 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
977 gst_debug_category_get_description (cat));
979 walk = g_slist_next (walk);
987 parse_one_option (gint opt, const gchar * arg, GError ** err)
991 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
993 case ARG_FATAL_WARNINGS:{
994 GLogLevelFlags fatal_mask;
996 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
997 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
998 g_log_set_always_fatal (fatal_mask);
1001 #ifndef GST_DISABLE_GST_DEBUG
1002 case ARG_DEBUG_LEVEL:{
1005 tmp = strtol (arg, NULL, 0);
1006 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1007 gst_debug_set_default_threshold (tmp);
1012 parse_debug_list (arg);
1014 case ARG_DEBUG_NO_COLOR:
1015 gst_debug_set_colored (FALSE);
1017 case ARG_DEBUG_DISABLE:
1018 gst_debug_set_active (FALSE);
1020 case ARG_DEBUG_HELP:
1024 case ARG_PLUGIN_SPEW:
1026 case ARG_PLUGIN_PATH:
1027 #ifndef GST_DISABLE_REGISTRY
1028 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1029 #endif /* GST_DISABLE_REGISTRY */
1031 case ARG_PLUGIN_LOAD:
1032 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1034 case ARG_SEGTRAP_DISABLE:
1035 _gst_disable_segtrap = TRUE;
1037 case ARG_REGISTRY_FORK_DISABLE:
1038 _gst_enable_registry_fork = FALSE;
1041 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1042 _("Unknown option"));
1050 parse_goption_arg (const gchar * opt,
1051 const gchar * arg, gpointer data, GError ** err)
1059 "--gst-version", ARG_VERSION}, {
1060 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1061 #ifndef GST_DISABLE_GST_DEBUG
1063 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1064 "--gst-debug", ARG_DEBUG}, {
1065 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1066 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1067 "--gst-debug-help", ARG_DEBUG_HELP},
1070 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1071 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1072 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1073 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1074 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1079 for (n = 0; options[n].opt; n++) {
1080 if (!strcmp (opt, options[n].opt)) {
1081 val = options[n].val;
1086 return parse_one_option (val, arg, err);
1089 extern GstRegistry *_gst_registry_default;
1094 * Clean up any resources created by GStreamer in gst_init().
1096 * It is normally not needed to call this function in a normal application
1097 * as the resources will automatically be freed when the program terminates.
1098 * This function is therefore mostly used by testsuites and other memory
1101 * After this call GStreamer (including this method) should not be used anymore.
1108 GST_INFO ("deinitializing GStreamer");
1110 if (!gst_initialized) {
1111 GST_DEBUG ("already deinitialized");
1115 clock = gst_system_clock_obtain ();
1116 gst_object_unref (clock);
1117 gst_object_unref (clock);
1119 _priv_gst_registry_cleanup ();
1121 gst_initialized = FALSE;
1122 GST_INFO ("deinitialized GStreamer");
1127 * @major: pointer to a guint to store the major version number
1128 * @minor: pointer to a guint to store the minor version number
1129 * @micro: pointer to a guint to store the micro version number
1130 * @nano: pointer to a guint to store the nano version number
1132 * Gets the version number of the GStreamer library.
1135 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1137 g_return_if_fail (major);
1138 g_return_if_fail (minor);
1139 g_return_if_fail (micro);
1140 g_return_if_fail (nano);
1142 *major = GST_VERSION_MAJOR;
1143 *minor = GST_VERSION_MINOR;
1144 *micro = GST_VERSION_MICRO;
1145 *nano = GST_VERSION_NANO;
1149 * gst_version_string:
1151 * This function returns a string that is useful for describing this version
1152 * of GStreamer to the outside world: user agent strings, logging, ...
1154 * Returns: a newly allocated string describing this version of GStreamer.
1158 gst_version_string ()
1160 guint major, minor, micro, nano;
1162 gst_version (&major, &minor, µ, &nano);
1164 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1166 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1168 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1173 * gst_segtrap_is_enabled:
1175 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1176 * to better catch and report errors to the application. Currently this feature
1177 * is enabled by default when loading plugins.
1179 * Applications might want to disable this behaviour with the
1180 * gst_segtrap_set_enabled() function. This is typically done if the application
1181 * wants to install its own handler without GStreamer interfering.
1183 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1188 gst_segtrap_is_enabled (void)
1190 /* yeps, it's enabled when it's not disabled */
1191 return !_gst_disable_segtrap;
1195 * gst_segtrap_set_enabled:
1196 * @enabled: whether a custom SIGSEGV handler should be installed.
1198 * Applications might want to disable/enable the SIGSEGV handling of
1199 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1204 gst_segtrap_set_enabled (gboolean enabled)
1206 _gst_disable_segtrap = !enabled;
1210 * gst_registry_fork_is_enabled:
1212 * By default GStreamer will perform a fork() when scanning and rebuilding the
1215 * Applications might want to disable this behaviour with the
1216 * gst_registry_fork_set_enabled() function.
1218 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1219 * platforms without fork(), this function will always return %FALSE.
1224 gst_registry_fork_is_enabled (void)
1226 return _gst_enable_registry_fork;
1230 * gst_registry_fork_set_enabled:
1231 * @enabled: whether rebuilding the registry may fork
1233 * Applications might want to disable/enable the usage of fork() when rebuilding
1234 * the registry. See gst_registry_fork_is_enabled() for more information.
1236 * On platforms without fork(), this function will have no effect on the return
1237 * value of gst_registry_fork_is_enabled().
1242 gst_registry_fork_set_enabled (gboolean enabled)
1245 _gst_enable_registry_fork = enabled;
1246 #endif /* HAVE_FORK */