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 */
114 #include "gst-i18n-lib.h"
115 #include <locale.h> /* for LC_ALL */
119 #define GST_CAT_DEFAULT GST_CAT_GST_INIT
121 #define MAX_PATH_SPLIT 16
122 #define GST_PLUGIN_SEPARATOR ","
124 static gboolean gst_initialized = FALSE;
126 #ifndef GST_DISABLE_REGISTRY
127 static GList *plugin_paths = NULL; /* for delayed processing in post_init */
130 extern gint _gst_trace_on;
134 #define DEFAULT_FORK TRUE
136 #define DEFAULT_FORK FALSE
137 #endif /* HAVE_FORK */
139 /* set to TRUE when segfaults need to be left as is, FIXME, this variable is
141 gboolean _gst_disable_segtrap = FALSE;
143 /* control the behaviour of registry rebuild */
144 static gboolean _gst_enable_registry_fork = DEFAULT_FORK;
146 static void load_plugin_func (gpointer data, gpointer user_data);
147 static gboolean init_pre (GOptionContext * context, GOptionGroup * group,
148 gpointer data, GError ** error);
149 static gboolean init_post (GOptionContext * context, GOptionGroup * group,
150 gpointer data, GError ** error);
151 static gboolean parse_goption_arg (const gchar * s_opt,
152 const gchar * arg, gpointer data, GError ** err);
154 static GSList *preload_plugins = NULL;
156 const gchar g_log_domain_gstreamer[] = "GStreamer";
159 debug_log_handler (const gchar * log_domain,
160 GLogLevelFlags log_level, const gchar * message, gpointer user_data)
162 g_log_default_handler (log_domain, log_level, message, user_data);
163 /* FIXME: do we still need this ? fatal errors these days are all
164 * other than core errors */
165 /* g_on_error_query (NULL); */
172 #ifndef GST_DISABLE_GST_DEBUG
183 ARG_REGISTRY_FORK_DISABLE
186 /* debug-spec ::= category-spec [, category-spec]*
187 * category-spec ::= category:val | val
196 #ifndef GST_DISABLE_GST_DEBUG
198 parse_debug_category (gchar * str, const gchar ** category)
215 parse_debug_level (gchar * str, gint * level)
223 if (str[0] != NUL && str[1] == NUL
224 && str[0] >= '0' && str[0] < '0' + GST_LEVEL_COUNT) {
225 *level = str[0] - '0';
233 parse_debug_list (const gchar * list)
238 g_return_if_fail (list != NULL);
240 split = g_strsplit (list, ",", 0);
242 for (walk = split; *walk; walk++) {
243 if (strchr (*walk, ':')) {
244 gchar **values = g_strsplit (*walk, ":", 2);
246 if (values[0] && values[1]) {
248 const gchar *category;
250 if (parse_debug_category (values[0], &category)
251 && parse_debug_level (values[1], &level))
252 gst_debug_set_threshold_for_name (category, level);
259 if (parse_debug_level (*walk, &level))
260 gst_debug_set_default_threshold (level);
269 * gst_init_get_option_group:
271 * Returns a #GOptionGroup with GStreamer's argument specifications. The
272 * group is set up to use standard GOption callbacks, so when using this
273 * group in combination with GOption parsing methods, all argument parsing
274 * and initialization is automated.
276 * This function is useful if you want to integrate GStreamer with other
277 * libraries that use GOption (see g_option_context_add_group() ).
279 * Returns: a pointer to GStreamer's option group. Should be dereferenced
284 gst_init_get_option_group (void)
287 const static GOptionEntry gst_args[] = {
288 {"gst-version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
289 (gpointer) parse_goption_arg, N_("Print the GStreamer version"), NULL},
290 {"gst-fatal-warnings", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
291 (gpointer) parse_goption_arg, N_("Make all warnings fatal"), NULL},
292 #ifndef GST_DISABLE_GST_DEBUG
293 {"gst-debug-help", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
294 (gpointer) parse_goption_arg,
295 N_("Print available debug categories and exit"),
297 {"gst-debug-level", 0, 0, G_OPTION_ARG_CALLBACK,
298 (gpointer) parse_goption_arg,
299 N_("Default debug level from 1 (only error) to 5 (anything) or "
302 {"gst-debug", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) parse_goption_arg,
303 N_("Comma-separated list of category_name:level pairs to set "
304 "specific levels for the individual categories. Example: "
305 "GST_AUTOPLUG:5,GST_ELEMENT_*:3"),
307 {"gst-debug-no-color", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
308 (gpointer) parse_goption_arg, N_("Disable colored debugging output"),
310 {"gst-debug-disable", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
311 (gpointer) parse_goption_arg, N_("Disable debugging"), NULL},
313 {"gst-plugin-spew", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
314 (gpointer) parse_goption_arg,
315 N_("Enable verbose plugin loading diagnostics"),
317 {"gst-plugin-path", 0, 0, G_OPTION_ARG_CALLBACK,
318 (gpointer) parse_goption_arg,
319 N_("Colon-separated paths containing plugins"), N_("PATHS")},
320 {"gst-plugin-load", 0, 0, G_OPTION_ARG_CALLBACK,
321 (gpointer) parse_goption_arg,
322 N_("Comma-separated list of plugins to preload in addition to the "
323 "list stored in environment variable GST_PLUGIN_PATH"),
325 {"gst-disable-segtrap", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
326 (gpointer) parse_goption_arg,
327 N_("Disable trapping of segmentation faults during plugin loading"),
329 {"gst-disable-registry-fork", 0, G_OPTION_FLAG_NO_ARG,
330 G_OPTION_ARG_CALLBACK,
331 (gpointer) parse_goption_arg,
332 N_("Disable the use of fork() while scanning the registry"),
337 group = g_option_group_new ("gst", _("GStreamer Options"),
338 _("Show GStreamer Options"), NULL, NULL);
339 g_option_group_set_parse_hooks (group, (GOptionParseFunc) init_pre,
340 (GOptionParseFunc) init_post);
342 g_option_group_add_entries (group, gst_args);
343 g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
350 * @argc: pointer to application's argc
351 * @argv: pointer to application's argv
352 * @err: pointer to a #GError to which a message will be posted on error
354 * Initializes the GStreamer library, setting up internal path lists,
355 * registering built-in elements, and loading standard plugins.
357 * This function will return %FALSE if GStreamer could not be initialized
358 * for some reason. If you want your program to fail fatally,
359 * use gst_init() instead.
361 * Returns: %TRUE if GStreamer could be initialized.
364 gst_init_check (int *argc, char **argv[], GError ** err)
370 GST_INFO ("initializing GStreamer");
372 if (gst_initialized) {
373 GST_DEBUG ("already initialized gst");
377 ctx = g_option_context_new ("- GStreamer initialization");
378 g_option_context_set_ignore_unknown_options (ctx, TRUE);
379 group = gst_init_get_option_group ();
380 g_option_context_add_group (ctx, group);
381 res = g_option_context_parse (ctx, argc, argv, err);
382 g_option_context_free (ctx);
384 gst_initialized = res;
387 GST_INFO ("initialized GStreamer successfully");
389 GST_INFO ("failed to initialize GStreamer");
397 * @argc: pointer to application's argc
398 * @argv: pointer to application's argv
400 * Initializes the GStreamer library, setting up internal path lists,
401 * registering built-in elements, and loading standard plugins.
404 * This function will terminate your program if it was unable to initialize
405 * GStreamer for some reason. If you want your program to fall back,
406 * use gst_init_check() instead.
409 * WARNING: This function does not work in the same way as corresponding
410 * functions in other glib-style libraries, such as gtk_init(). In
411 * particular, unknown command line options cause this function to
412 * abort program execution.
415 gst_init (int *argc, char **argv[])
419 if (!gst_init_check (argc, argv, &err)) {
420 g_print ("Could not initialize GStreamer: %s\n",
421 err ? err->message : "unknown error occurred");
429 #ifndef GST_DISABLE_REGISTRY
431 add_path_func (gpointer data, gpointer user_data)
433 GST_INFO ("Adding plugin path: \"%s\", will scan later", (gchar *) data);
434 plugin_paths = g_list_append (plugin_paths, g_strdup (data));
439 prepare_for_load_plugin_func (gpointer data, gpointer user_data)
441 preload_plugins = g_slist_prepend (preload_plugins, g_strdup (data));
445 load_plugin_func (gpointer data, gpointer user_data)
448 const gchar *filename;
451 filename = (const gchar *) data;
453 plugin = gst_plugin_load_file (filename, &err);
456 GST_INFO ("Loaded plugin: \"%s\"", filename);
458 gst_default_registry_add_plugin (plugin);
461 /* Report error to user, and free error */
462 GST_ERROR ("Failed to load plugin: %s\n", err->message);
465 GST_WARNING ("Failed to load plugin: \"%s\"", filename);
473 split_and_iterate (const gchar * stringlist, gchar * separator, GFunc iterator,
478 gchar *lastlist = g_strdup (stringlist);
481 strings = g_strsplit (lastlist, separator, MAX_PATH_SPLIT);
486 iterator (strings[j], user_data);
487 if (++j == MAX_PATH_SPLIT) {
488 lastlist = g_strdup (strings[j]);
493 g_strfreev (strings);
497 /* we have no fail cases yet, but maybe in the future */
499 init_pre (GOptionContext * context, GOptionGroup * group, gpointer data,
502 /* GStreamer was built against a GLib >= 2.8 and is therefore not doing
503 * the refcount hack. Check that it isn't being run against an older GLib */
504 if (glib_major_version < 2 ||
505 (glib_major_version == 2 && glib_minor_version < 8)) {
506 g_warning ("GStreamer was compiled against GLib %d.%d.%d but is running"
507 " against %d.%d.%d. This will cause reference counting issues",
508 GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION,
509 glib_major_version, glib_minor_version, glib_micro_version);
514 if (g_thread_supported ()) {
515 /* somebody already initialized threading */
517 g_thread_init (NULL);
519 /* we need threading to be enabled right here */
523 setlocale (LC_ALL, "");
524 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
525 #endif /* ENABLE_NLS */
527 #ifndef GST_DISABLE_GST_DEBUG
529 const gchar *debug_list;
531 if (g_getenv ("GST_DEBUG_NO_COLOR") != NULL)
532 gst_debug_set_colored (FALSE);
534 debug_list = g_getenv ("GST_DEBUG");
536 parse_debug_list (debug_list);
540 /* This is the earliest we can make stuff show up in the logs.
541 * So give some useful info about GStreamer here */
542 GST_INFO ("Initializing GStreamer Core Library version %s", VERSION);
543 GST_INFO ("Using library installed in %s", LIBDIR);
549 gst_register_core_elements (GstPlugin * plugin)
551 /* register some standard builtin types */
552 if (!gst_element_register (plugin, "bin", GST_RANK_PRIMARY,
554 !gst_element_register (plugin, "pipeline", GST_RANK_PRIMARY,
557 g_assert_not_reached ();
562 static GstPluginDesc plugin_desc = {
566 "core elements linked into the GStreamer library",
567 gst_register_core_elements,
577 #ifndef GST_DISABLE_REGISTRY
580 * scan_and_update_registry:
581 * @default_registry: the #GstRegistry
582 * @registry_file: registry filename
583 * @write_changes: write registry if it has changed?
585 * Scans for registry changes and evntualy updates the registry cache.
587 * Return: %TRUE if the registry could be updated
590 scan_and_update_registry (GstRegistry * default_registry,
591 const gchar * registry_file, gboolean write_changes, GError ** error)
593 const gchar *plugin_path;
594 gboolean changed = FALSE;
597 GST_DEBUG ("reading registry cache: %s", registry_file);
598 gst_registry_xml_read_cache (default_registry, registry_file);
600 /* scan paths specified via --gst-plugin-path */
601 GST_DEBUG ("scanning paths added via --gst-plugin-path");
602 for (l = plugin_paths; l != NULL; l = l->next) {
603 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
604 /* CHECKME: add changed |= here as well? */
605 gst_registry_scan_path (default_registry, (gchar *) l->data);
608 g_list_free (plugin_paths);
611 /* GST_PLUGIN_PATH specifies a list of directories to scan for
612 * additional plugins. These take precedence over the system plugins */
613 plugin_path = g_getenv ("GST_PLUGIN_PATH");
618 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
619 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
620 for (i = 0; list[i]; i++) {
621 changed |= gst_registry_scan_path (default_registry, list[i]);
625 GST_DEBUG ("GST_PLUGIN_PATH not set");
628 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
629 * loaded by default. If not set, this defaults to the system-installed
630 * path, and the plugins installed in the user's home directory */
631 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
632 if (plugin_path == NULL) {
635 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
637 /* plugins in the user's home directory take precedence over
638 * system-installed ones */
639 home_plugins = g_build_filename (g_get_home_dir (),
640 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
641 changed |= gst_registry_scan_path (default_registry, home_plugins);
642 g_free (home_plugins);
644 /* add the main (installed) library path */
645 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
650 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
651 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
652 for (i = 0; list[i]; i++) {
653 changed |= gst_registry_scan_path (default_registry, list[i]);
658 /* Remove cached plugins so stale info is cleared. */
659 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
662 GST_INFO ("Registry cache has not changed");
666 if (!write_changes) {
667 GST_INFO ("Registry cached changed, but writing is disabled. Not writing.");
671 GST_INFO ("Registry cache changed. Writing new registry cache");
672 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
673 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
674 _("Error writing registry cache to %s: %s"),
675 registry_file, g_strerror (errno));
679 GST_INFO ("Registry cache written successfully");
684 ensure_current_registry_nonforking (GstRegistry * default_registry,
685 const gchar * registry_file, GError ** error)
687 /* fork() not available */
688 GST_DEBUG ("Updating registry cache in-process");
689 scan_and_update_registry (default_registry, registry_file, TRUE, error);
693 /* when forking is not available this function always does nothing but return
696 ensure_current_registry_forking (GstRegistry * default_registry,
697 const gchar * registry_file, GError ** error)
703 /* We fork here, and let the child read and possibly rebuild the registry.
704 * After that, the parent will re-read the freshly generated registry. */
705 GST_DEBUG ("forking to update registry");
707 if (pipe (pfd) == -1) {
708 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
709 _("Error re-scanning registry %s: %s"),
710 ", could not create pipes. Error", g_strerror (errno));
716 GST_ERROR ("Failed to fork()");
717 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
718 _("Error re-scanning registry %s: %s"),
719 ", failed to fork. Error", g_strerror (errno));
727 /* this is the child. Close the read pipe */
730 GST_DEBUG ("child reading registry cache");
732 scan_and_update_registry (default_registry, registry_file, TRUE, NULL);
734 /* need to use _exit, so that any exit handlers registered don't
735 * bring down the main program */
736 GST_DEBUG ("child exiting: %s", (res) ? "SUCCESS" : "FAILURE");
738 /* make valgrind happy (yes, you can call it insane) */
739 g_free ((char *) registry_file);
741 /* write a result byte to the pipe */
742 res_byte = res ? '1' : '0';
743 if (write (pfd[1], &res_byte, 1) != 1 || close (pfd[1]) != 0) {
744 /* could not write to pipe, probably means parent has exited before us */
751 /* parent. Close write pipe */
754 /* Wait for result from the pipe */
755 GST_DEBUG ("Waiting for data from child");
756 ret = read (pfd[0], &res_byte, 1);
758 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
759 _("Error re-scanning registry %s: %s"),
760 ", read returned error", g_strerror (errno));
766 /* Wait to ensure the child is reaped, but ignore the result */
767 GST_DEBUG ("parent waiting on child");
768 waitpid (pid, NULL, 0);
769 GST_DEBUG ("parent done waiting on child");
772 GST_ERROR ("child did not exit normally, terminated by signal");
773 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
774 _("Error re-scanning registry %s"), ", child terminated by signal");
778 if (res_byte == '1') {
779 GST_DEBUG ("Child succeeded. Parent reading registry cache");
780 gst_registry_xml_read_cache (default_registry, registry_file);
782 GST_DEBUG ("Child failed. Parent re-scanning registry, ignoring errors.");
783 scan_and_update_registry (default_registry, registry_file, FALSE, NULL);
786 #endif /* HAVE_FORK */
791 ensure_current_registry (GError ** error)
794 GstRegistry *default_registry;
798 default_registry = gst_registry_get_default ();
799 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
800 if (registry_file == NULL) {
801 registry_file = g_build_filename (g_get_home_dir (),
802 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
805 /* first see if forking is enabled */
806 do_fork = _gst_enable_registry_fork;
808 const gchar *fork_env;
810 /* forking enabled, see if it is disabled with an env var */
811 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
812 /* fork enabled for any value different from "no" */
813 do_fork = strcmp (fork_env, "no") != 0;
817 /* now check registry with or without forking */
819 GST_DEBUG ("forking for registry rebuild");
820 ret = ensure_current_registry_forking (default_registry, registry_file,
823 GST_DEBUG ("requested not to fork for registry rebuild");
824 ret = ensure_current_registry_nonforking (default_registry, registry_file,
828 g_free (registry_file);
832 #endif /* GST_DISABLE_REGISTRY */
836 * - initalization of threads if we use them
839 * - initializes gst_format
840 * - registers a bunch of types for gst_objects
842 * - we don't have cases yet where this fails, but in the future
843 * we might and then it's nice to be able to return that
846 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
851 #ifndef GST_DISABLE_TRACE
853 #endif /* GST_DISABLE_TRACE */
855 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
856 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
858 _priv_gst_quarks_initialize ();
859 _gst_format_initialize ();
860 _gst_query_initialize ();
861 gst_object_get_type ();
863 gst_element_factory_get_type ();
864 gst_element_get_type ();
865 gst_type_find_factory_get_type ();
868 #ifndef GST_DISABLE_INDEX
869 gst_index_factory_get_type ();
870 #endif /* GST_DISABLE_INDEX */
871 #ifndef GST_DISABLE_URI
872 gst_uri_handler_get_type ();
873 #endif /* GST_DISABLE_URI */
875 gst_structure_get_type ();
876 _gst_value_initialize ();
877 gst_caps_get_type ();
878 _gst_event_initialize ();
879 _gst_buffer_initialize ();
880 _gst_message_initialize ();
881 _gst_tag_initialize ();
883 /* register core plugins */
884 _gst_plugin_register_static (&plugin_desc);
886 _gst_plugin_initialize ();
889 * Any errors happening below this point are non-fatal, we therefore mark
890 * gstreamer as being initialized, since it is the case from a plugin point of
893 * If anything fails, it will be put back to FALSE in gst_init_check().
894 * This allows some special plugins that would call gst_init() to not cause a
895 * looping effect (i.e. initializing GStreamer twice).
897 gst_initialized = TRUE;
899 #ifndef GST_DISABLE_REGISTRY
900 if (!ensure_current_registry (error))
902 #endif /* GST_DISABLE_REGISTRY */
904 /* if we need to preload plugins */
905 if (preload_plugins) {
906 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
907 g_slist_free (preload_plugins);
908 preload_plugins = NULL;
910 #ifndef GST_DISABLE_TRACE
913 gst_trace = gst_trace_new ("gst.trace", 1024);
914 gst_trace_set_default (gst_trace);
916 #endif /* GST_DISABLE_TRACE */
921 #ifndef GST_DISABLE_GST_DEBUG
923 select_all (GstPlugin * plugin, gpointer user_data)
929 sort_by_category_name (gconstpointer a, gconstpointer b)
931 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
932 gst_debug_category_get_name ((GstDebugCategory *) b));
935 gst_debug_help (void)
940 /* Need to ensure the registry is loaded to get debug categories */
941 if (!init_post (NULL, NULL, NULL, NULL))
944 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
945 select_all, FALSE, NULL);
947 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
948 for (g = list2; g; g = g_list_next (g)) {
949 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
951 gst_plugin_load (plugin);
955 list = gst_debug_get_all_categories ();
956 walk = list = g_slist_sort (list, sort_by_category_name);
959 g_print ("name level description\n");
960 g_print ("---------------------+--------+--------------------------------\n");
963 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
965 if (gst_debug_is_colored ()) {
966 gchar *color = gst_debug_construct_term_color (cat->color);
968 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
970 gst_debug_category_get_name (cat),
971 gst_debug_category_get_threshold (cat),
972 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
973 color, gst_debug_category_get_description (cat));
976 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
977 gst_debug_category_get_threshold (cat),
978 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
979 gst_debug_category_get_description (cat));
981 walk = g_slist_next (walk);
989 parse_one_option (gint opt, const gchar * arg, GError ** err)
993 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
995 case ARG_FATAL_WARNINGS:{
996 GLogLevelFlags fatal_mask;
998 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
999 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1000 g_log_set_always_fatal (fatal_mask);
1003 #ifndef GST_DISABLE_GST_DEBUG
1004 case ARG_DEBUG_LEVEL:{
1007 tmp = strtol (arg, NULL, 0);
1008 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1009 gst_debug_set_default_threshold (tmp);
1014 parse_debug_list (arg);
1016 case ARG_DEBUG_NO_COLOR:
1017 gst_debug_set_colored (FALSE);
1019 case ARG_DEBUG_DISABLE:
1020 gst_debug_set_active (FALSE);
1022 case ARG_DEBUG_HELP:
1026 case ARG_PLUGIN_SPEW:
1028 case ARG_PLUGIN_PATH:
1029 #ifndef GST_DISABLE_REGISTRY
1030 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1031 #endif /* GST_DISABLE_REGISTRY */
1033 case ARG_PLUGIN_LOAD:
1034 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1036 case ARG_SEGTRAP_DISABLE:
1037 _gst_disable_segtrap = TRUE;
1039 case ARG_REGISTRY_FORK_DISABLE:
1040 _gst_enable_registry_fork = FALSE;
1043 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1044 _("Unknown option"));
1052 parse_goption_arg (const gchar * opt,
1053 const gchar * arg, gpointer data, GError ** err)
1061 "--gst-version", ARG_VERSION}, {
1062 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1063 #ifndef GST_DISABLE_GST_DEBUG
1065 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1066 "--gst-debug", ARG_DEBUG}, {
1067 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1068 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1069 "--gst-debug-help", ARG_DEBUG_HELP},
1072 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1073 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1074 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1075 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1076 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1081 for (n = 0; options[n].opt; n++) {
1082 if (!strcmp (opt, options[n].opt)) {
1083 val = options[n].val;
1088 return parse_one_option (val, arg, err);
1091 extern GstRegistry *_gst_registry_default;
1096 * Clean up any resources created by GStreamer in gst_init().
1098 * It is normally not needed to call this function in a normal application
1099 * as the resources will automatically be freed when the program terminates.
1100 * This function is therefore mostly used by testsuites and other memory
1103 * After this call GStreamer (including this method) should not be used anymore.
1110 GST_INFO ("deinitializing GStreamer");
1112 if (!gst_initialized) {
1113 GST_DEBUG ("already deinitialized");
1117 clock = gst_system_clock_obtain ();
1118 gst_object_unref (clock);
1119 gst_object_unref (clock);
1121 _priv_gst_registry_cleanup ();
1123 gst_initialized = FALSE;
1124 GST_INFO ("deinitialized GStreamer");
1129 * @major: pointer to a guint to store the major version number
1130 * @minor: pointer to a guint to store the minor version number
1131 * @micro: pointer to a guint to store the micro version number
1132 * @nano: pointer to a guint to store the nano version number
1134 * Gets the version number of the GStreamer library.
1137 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1139 g_return_if_fail (major);
1140 g_return_if_fail (minor);
1141 g_return_if_fail (micro);
1142 g_return_if_fail (nano);
1144 *major = GST_VERSION_MAJOR;
1145 *minor = GST_VERSION_MINOR;
1146 *micro = GST_VERSION_MICRO;
1147 *nano = GST_VERSION_NANO;
1151 * gst_version_string:
1153 * This function returns a string that is useful for describing this version
1154 * of GStreamer to the outside world: user agent strings, logging, ...
1156 * Returns: a newly allocated string describing this version of GStreamer.
1160 gst_version_string ()
1162 guint major, minor, micro, nano;
1164 gst_version (&major, &minor, µ, &nano);
1166 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1168 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1170 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1175 * gst_segtrap_is_enabled:
1177 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1178 * to better catch and report errors to the application. Currently this feature
1179 * is enabled by default when loading plugins.
1181 * Applications might want to disable this behaviour with the
1182 * gst_segtrap_set_enabled() function. This is typically done if the application
1183 * wants to install its own handler without GStreamer interfering.
1185 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1190 gst_segtrap_is_enabled (void)
1192 /* yeps, it's enabled when it's not disabled */
1193 return !_gst_disable_segtrap;
1197 * gst_segtrap_set_enabled:
1198 * @enabled: whether a custom SIGSEGV handler should be installed.
1200 * Applications might want to disable/enable the SIGSEGV handling of
1201 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1206 gst_segtrap_set_enabled (gboolean enabled)
1208 _gst_disable_segtrap = !enabled;
1212 * gst_registry_fork_is_enabled:
1214 * By default GStreamer will perform a fork() when scanning and rebuilding the
1217 * Applications might want to disable this behaviour with the
1218 * gst_registry_fork_set_enabled() function.
1220 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1221 * platforms without fork(), this function will always return %FALSE.
1226 gst_registry_fork_is_enabled (void)
1228 return _gst_enable_registry_fork;
1232 * gst_registry_fork_set_enabled:
1233 * @enabled: whether rebuilding the registry may fork
1235 * Applications might want to disable/enable the usage of fork() when rebuilding
1236 * the registry. See gst_registry_fork_is_enabled() for more information.
1238 * On platforms without fork(), this function will have no effect on the return
1239 * value of gst_registry_fork_is_enabled().
1244 gst_registry_fork_set_enabled (gboolean enabled)
1247 _gst_enable_registry_fork = enabled;
1248 #endif /* HAVE_FORK */