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;
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 static void load_plugin_func (gpointer data, gpointer user_data);
155 static gboolean init_pre (GOptionContext * context, GOptionGroup * group,
156 gpointer data, GError ** error);
157 static gboolean init_post (GOptionContext * context, GOptionGroup * group,
158 gpointer data, GError ** error);
159 #ifndef GST_DISABLE_OPTION_PARSING
160 static gboolean parse_goption_arg (const gchar * s_opt,
161 const gchar * arg, gpointer data, GError ** err);
164 static GSList *preload_plugins = NULL;
166 const gchar g_log_domain_gstreamer[] = "GStreamer";
169 debug_log_handler (const gchar * log_domain,
170 GLogLevelFlags log_level, const gchar * message, gpointer user_data)
172 g_log_default_handler (log_domain, log_level, message, user_data);
173 /* FIXME: do we still need this ? fatal errors these days are all
174 * other than core errors */
175 /* g_on_error_query (NULL); */
182 #ifndef GST_DISABLE_GST_DEBUG
193 ARG_REGISTRY_FORK_DISABLE
196 /* debug-spec ::= category-spec [, category-spec]*
197 * category-spec ::= category:val | val
206 #ifndef GST_DISABLE_GST_DEBUG
208 parse_debug_category (gchar * str, const gchar ** category)
225 parse_debug_level (gchar * str, gint * level)
233 if (str[0] != NUL && str[1] == NUL
234 && str[0] >= '0' && str[0] < '0' + GST_LEVEL_COUNT) {
235 *level = str[0] - '0';
243 parse_debug_list (const gchar * list)
248 g_return_if_fail (list != NULL);
250 split = g_strsplit (list, ",", 0);
252 for (walk = split; *walk; walk++) {
253 if (strchr (*walk, ':')) {
254 gchar **values = g_strsplit (*walk, ":", 2);
256 if (values[0] && values[1]) {
258 const gchar *category;
260 if (parse_debug_category (values[0], &category)
261 && parse_debug_level (values[1], &level))
262 gst_debug_set_threshold_for_name (category, level);
269 if (parse_debug_level (*walk, &level))
270 gst_debug_set_default_threshold (level);
279 * gst_init_get_option_group:
281 * Returns a #GOptionGroup with GStreamer's argument specifications. The
282 * group is set up to use standard GOption callbacks, so when using this
283 * group in combination with GOption parsing methods, all argument parsing
284 * and initialization is automated.
286 * This function is useful if you want to integrate GStreamer with other
287 * libraries that use GOption (see g_option_context_add_group() ).
289 * If you use this function, you should make sure you initialise the GLib
290 * threading system as one of the very first things in your program
291 * (see the example at the beginning of this section).
293 * Returns: a pointer to GStreamer's option group.
297 gst_init_get_option_group (void)
299 #ifndef GST_DISABLE_OPTION_PARSING
301 const static GOptionEntry gst_args[] = {
302 {"gst-version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
303 (gpointer) parse_goption_arg, N_("Print the GStreamer version"), NULL},
304 {"gst-fatal-warnings", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
305 (gpointer) parse_goption_arg, N_("Make all warnings fatal"), NULL},
306 #ifndef GST_DISABLE_GST_DEBUG
307 {"gst-debug-help", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
308 (gpointer) parse_goption_arg,
309 N_("Print available debug categories and exit"),
311 {"gst-debug-level", 0, 0, G_OPTION_ARG_CALLBACK,
312 (gpointer) parse_goption_arg,
313 N_("Default debug level from 1 (only error) to 5 (anything) or "
316 {"gst-debug", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) parse_goption_arg,
317 N_("Comma-separated list of category_name:level pairs to set "
318 "specific levels for the individual categories. Example: "
319 "GST_AUTOPLUG:5,GST_ELEMENT_*:3"),
321 {"gst-debug-no-color", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
322 (gpointer) parse_goption_arg, N_("Disable colored debugging output"),
324 {"gst-debug-disable", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
325 (gpointer) parse_goption_arg, N_("Disable debugging"), NULL},
327 {"gst-plugin-spew", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
328 (gpointer) parse_goption_arg,
329 N_("Enable verbose plugin loading diagnostics"),
331 {"gst-plugin-path", 0, 0, G_OPTION_ARG_CALLBACK,
332 (gpointer) parse_goption_arg,
333 N_("Colon-separated paths containing plugins"), N_("PATHS")},
334 {"gst-plugin-load", 0, 0, G_OPTION_ARG_CALLBACK,
335 (gpointer) parse_goption_arg,
336 N_("Comma-separated list of plugins to preload in addition to the "
337 "list stored in environment variable GST_PLUGIN_PATH"),
339 {"gst-disable-segtrap", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
340 (gpointer) parse_goption_arg,
341 N_("Disable trapping of segmentation faults during plugin loading"),
343 {"gst-disable-registry-fork", 0, G_OPTION_FLAG_NO_ARG,
344 G_OPTION_ARG_CALLBACK,
345 (gpointer) parse_goption_arg,
346 N_("Disable the use of fork() while scanning the registry"),
351 /* The GLib threading system must be initialised before calling any other
352 * GLib function according to the documentation; if the application hasn't
353 * called gst_init() yet or initialised the threading system otherwise, we
354 * better issue a warning here (since chances are high that the application
355 * has already called other GLib functions such as g_option_context_new() */
356 if (!g_thread_supported ()) {
357 g_warning ("The GStreamer function gst_init_get_option_group() was\n"
358 "\tcalled, but the GLib threading system has not been initialised\n"
359 "\tyet, something that must happen before any other GLib function\n"
360 "\tis called. The application needs to be fixed so that it calls\n"
361 "\t if (!g_thread_supported ()) g_thread_init(NULL);\n"
362 "\tas very first thing in its main() function. Please file a bug\n"
363 "\tagainst this application.");
364 g_thread_init (NULL);
367 group = g_option_group_new ("gst", _("GStreamer Options"),
368 _("Show GStreamer Options"), NULL, NULL);
369 g_option_group_set_parse_hooks (group, (GOptionParseFunc) init_pre,
370 (GOptionParseFunc) init_post);
372 g_option_group_add_entries (group, gst_args);
373 g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
383 * @argc: pointer to application's argc
384 * @argv: pointer to application's argv
385 * @err: pointer to a #GError to which a message will be posted on error
387 * Initializes the GStreamer library, setting up internal path lists,
388 * registering built-in elements, and loading standard plugins.
390 * This function will return %FALSE if GStreamer could not be initialized
391 * for some reason. If you want your program to fail fatally,
392 * use gst_init() instead.
394 * This function should be called before calling any other GLib functions. If
395 * this is not an option, your program must initialise the GLib thread system
396 * using g_thread_init() before any other GLib functions are called.
398 * Returns: %TRUE if GStreamer could be initialized.
401 gst_init_check (int *argc, char **argv[], GError ** err)
403 #ifndef GST_DISABLE_OPTION_PARSING
409 if (!g_thread_supported ())
410 g_thread_init (NULL);
412 if (gst_initialized) {
413 GST_DEBUG ("already initialized gst");
416 #ifndef GST_DISABLE_OPTION_PARSING
417 ctx = g_option_context_new ("- GStreamer initialization");
418 g_option_context_set_ignore_unknown_options (ctx, TRUE);
419 group = gst_init_get_option_group ();
420 g_option_context_add_group (ctx, group);
421 res = g_option_context_parse (ctx, argc, argv, err);
422 g_option_context_free (ctx);
424 init_pre (NULL, NULL, NULL, NULL);
425 init_post (NULL, NULL, NULL, NULL);
429 gst_initialized = res;
432 GST_INFO ("initialized GStreamer successfully");
434 GST_INFO ("failed to initialize GStreamer");
442 * @argc: pointer to application's argc
443 * @argv: pointer to application's argv
445 * Initializes the GStreamer library, setting up internal path lists,
446 * registering built-in elements, and loading standard plugins.
448 * This function should be called before calling any other GLib functions. If
449 * this is not an option, your program must initialise the GLib thread system
450 * using g_thread_init() before any other GLib functions are called.
453 * This function will terminate your program if it was unable to initialize
454 * GStreamer for some reason. If you want your program to fall back,
455 * use gst_init_check() instead.
458 * WARNING: This function does not work in the same way as corresponding
459 * functions in other glib-style libraries, such as gtk_init(). In
460 * particular, unknown command line options cause this function to
461 * abort program execution.
464 gst_init (int *argc, char **argv[])
468 if (!gst_init_check (argc, argv, &err)) {
469 g_print ("Could not initialize GStreamer: %s\n",
470 err ? err->message : "unknown error occurred");
478 #ifndef GST_DISABLE_REGISTRY
480 add_path_func (gpointer data, gpointer user_data)
482 GST_INFO ("Adding plugin path: \"%s\", will scan later", (gchar *) data);
483 plugin_paths = g_list_append (plugin_paths, g_strdup (data));
487 #ifndef GST_DISABLE_OPTION_PARSING
489 prepare_for_load_plugin_func (gpointer data, gpointer user_data)
491 preload_plugins = g_slist_prepend (preload_plugins, g_strdup (data));
496 load_plugin_func (gpointer data, gpointer user_data)
499 const gchar *filename;
502 filename = (const gchar *) data;
504 plugin = gst_plugin_load_file (filename, &err);
507 GST_INFO ("Loaded plugin: \"%s\"", filename);
509 gst_default_registry_add_plugin (plugin);
512 /* Report error to user, and free error */
513 GST_ERROR ("Failed to load plugin: %s", err->message);
516 GST_WARNING ("Failed to load plugin: \"%s\"", filename);
521 #ifndef GST_DISABLE_OPTION_PARSING
523 split_and_iterate (const gchar * stringlist, gchar * separator, GFunc iterator,
528 gchar *lastlist = g_strdup (stringlist);
531 strings = g_strsplit (lastlist, separator, MAX_PATH_SPLIT);
536 iterator (strings[j], user_data);
537 if (++j == MAX_PATH_SPLIT) {
538 lastlist = g_strdup (strings[j]);
543 g_strfreev (strings);
548 /* we have no fail cases yet, but maybe in the future */
550 init_pre (GOptionContext * context, GOptionGroup * group, gpointer data,
553 if (gst_initialized) {
554 GST_DEBUG ("already initialized");
558 /* GStreamer was built against a GLib >= 2.8 and is therefore not doing
559 * the refcount hack. Check that it isn't being run against an older GLib */
560 if (glib_major_version < 2 ||
561 (glib_major_version == 2 && glib_minor_version < 8)) {
562 g_warning ("GStreamer was compiled against GLib %d.%d.%d but is running"
563 " against %d.%d.%d. This will cause reference counting issues",
564 GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION,
565 glib_major_version, glib_minor_version, glib_micro_version);
570 /* we need threading to be enabled right here */
571 g_assert (g_thread_supported ());
575 setlocale (LC_ALL, "");
576 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
577 #endif /* ENABLE_NLS */
579 #ifndef GST_DISABLE_GST_DEBUG
581 const gchar *debug_list;
583 if (g_getenv ("GST_DEBUG_NO_COLOR") != NULL)
584 gst_debug_set_colored (FALSE);
586 debug_list = g_getenv ("GST_DEBUG");
588 parse_debug_list (debug_list);
592 priv_gst_dump_dot_dir = g_getenv ("GST_DEBUG_DUMP_DOT_DIR");
594 /* This is the earliest we can make stuff show up in the logs.
595 * So give some useful info about GStreamer here */
596 GST_INFO ("Initializing GStreamer Core Library version %s", VERSION);
597 GST_INFO ("Using library installed in %s", LIBDIR);
599 /* Print some basic system details if possible (OS/architecture) */
600 #ifdef HAVE_SYS_UTSNAME_H
602 struct utsname sys_details;
604 if (uname (&sys_details) == 0) {
605 GST_INFO ("%s %s %s %s %s", sys_details.sysname,
606 sys_details.nodename, sys_details.release, sys_details.version,
607 sys_details.machine);
616 gst_register_core_elements (GstPlugin * plugin)
618 /* register some standard builtin types */
619 if (!gst_element_register (plugin, "bin", GST_RANK_PRIMARY,
621 !gst_element_register (plugin, "pipeline", GST_RANK_PRIMARY,
624 g_assert_not_reached ();
629 #ifndef GST_DISABLE_REGISTRY
633 REGISTRY_SCAN_AND_UPDATE_FAILURE = 0,
634 REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED,
635 REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED
636 } GstRegistryScanAndUpdateResult;
639 * scan_and_update_registry:
640 * @default_registry: the #GstRegistry
641 * @registry_file: registry filename
642 * @write_changes: write registry if it has changed?
644 * Scans for registry changes and eventually updates the registry cache.
646 * Return: %REGISTRY_SCAN_AND_UPDATE_FAILURE if the registry could not scanned
647 * or updated, %REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED if the
648 * registry is clean and %REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED if
649 * it has been updated and the cache needs to be re-read.
651 static GstRegistryScanAndUpdateResult
652 scan_and_update_registry (GstRegistry * default_registry,
653 const gchar * registry_file, gboolean write_changes, GError ** error)
655 const gchar *plugin_path;
656 gboolean changed = FALSE;
659 GST_INFO ("Validating registry cache");
661 /* scan paths specified via --gst-plugin-path */
662 GST_DEBUG ("scanning paths added via --gst-plugin-path");
663 for (l = plugin_paths; l != NULL; l = l->next) {
664 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
665 /* CHECKME: add changed |= here as well? */
666 gst_registry_scan_path (default_registry, (gchar *) l->data);
668 /* keep plugin_paths around in case a re-scan is forced later on */
670 /* GST_PLUGIN_PATH specifies a list of directories to scan for
671 * additional plugins. These take precedence over the system plugins */
672 plugin_path = g_getenv ("GST_PLUGIN_PATH");
677 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
678 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
679 for (i = 0; list[i]; i++) {
680 changed |= gst_registry_scan_path (default_registry, list[i]);
684 GST_DEBUG ("GST_PLUGIN_PATH not set");
687 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
688 * loaded by default. If not set, this defaults to the system-installed
689 * path, and the plugins installed in the user's home directory */
690 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
691 if (plugin_path == NULL) {
694 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
696 /* plugins in the user's home directory take precedence over
697 * system-installed ones */
698 home_plugins = g_build_filename (g_get_home_dir (),
699 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
700 GST_DEBUG ("scanning home plugins %s", home_plugins);
701 changed |= gst_registry_scan_path (default_registry, home_plugins);
702 g_free (home_plugins);
704 /* add the main (installed) library path */
705 GST_DEBUG ("scanning main plugins %s", PLUGINDIR);
706 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
711 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
712 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
713 for (i = 0; list[i]; i++) {
714 changed |= gst_registry_scan_path (default_registry, list[i]);
719 /* Remove cached plugins so stale info is cleared. */
720 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
723 GST_INFO ("Registry cache has not changed");
724 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED;
727 if (!write_changes) {
728 GST_INFO ("Registry cache changed, but writing is disabled. Not writing.");
729 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
732 GST_INFO ("Registry cache changed. Writing new registry cache");
733 #ifdef USE_BINARY_REGISTRY
734 if (!gst_registry_binary_write_cache (default_registry, registry_file)) {
736 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
738 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
739 _("Error writing registry cache to %s: %s"),
740 registry_file, g_strerror (errno));
741 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
744 GST_INFO ("Registry cache written successfully");
745 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED;
749 ensure_current_registry_nonforking (GstRegistry * default_registry,
750 const gchar * registry_file, GError ** error)
752 /* fork() not available */
753 GST_INFO ("reading registry cache: %s", registry_file);
754 #ifdef USE_BINARY_REGISTRY
755 gst_registry_binary_read_cache (default_registry, registry_file);
757 gst_registry_xml_read_cache (default_registry, registry_file);
759 GST_DEBUG ("Updating registry cache in-process");
760 scan_and_update_registry (default_registry, registry_file, TRUE, error);
764 /* when forking is not available this function always does nothing but return
767 ensure_current_registry_forking (GstRegistry * default_registry,
768 const gchar * registry_file, GError ** error)
775 /* We fork here, and let the child read and possibly rebuild the registry.
776 * After that, the parent will re-read the freshly generated registry. */
777 GST_DEBUG ("forking to update registry");
779 if (pipe (pfd) == -1) {
780 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
781 _("Error re-scanning registry %s: %s"),
782 ", could not create pipes. Error", g_strerror (errno));
786 GST_INFO ("reading registry cache: %s", registry_file);
787 #ifdef USE_BINARY_REGISTRY
788 gst_registry_binary_read_cache (default_registry, registry_file);
790 gst_registry_xml_read_cache (default_registry, registry_file);
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)
882 GstRegistry *default_registry;
886 default_registry = gst_registry_get_default ();
887 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
888 if (registry_file == NULL) {
889 #ifdef USE_BINARY_REGISTRY
890 registry_file = g_build_filename (g_get_home_dir (),
891 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".bin", NULL);
893 registry_file = g_build_filename (g_get_home_dir (),
894 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
898 /* first see if forking is enabled */
899 do_fork = _gst_enable_registry_fork;
901 const gchar *fork_env;
903 /* forking enabled, see if it is disabled with an env var */
904 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
905 /* fork enabled for any value different from "no" */
906 do_fork = strcmp (fork_env, "no") != 0;
910 /* now check registry with or without forking */
912 GST_DEBUG ("forking for registry rebuild");
913 ret = ensure_current_registry_forking (default_registry, registry_file,
916 GST_DEBUG ("requested not to fork for registry rebuild");
917 ret = ensure_current_registry_nonforking (default_registry, registry_file,
921 g_free (registry_file);
925 #endif /* GST_DISABLE_REGISTRY */
929 * - initalization of threads if we use them
932 * - initializes gst_format
933 * - registers a bunch of types for gst_objects
935 * - we don't have cases yet where this fails, but in the future
936 * we might and then it's nice to be able to return that
939 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
944 #ifndef GST_DISABLE_TRACE
946 #endif /* GST_DISABLE_TRACE */
948 if (gst_initialized) {
949 GST_DEBUG ("already initialized");
953 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
954 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
956 _priv_gst_quarks_initialize ();
957 _gst_format_initialize ();
958 _gst_query_initialize ();
959 g_type_class_ref (gst_object_get_type ());
960 g_type_class_ref (gst_pad_get_type ());
961 g_type_class_ref (gst_element_factory_get_type ());
962 g_type_class_ref (gst_element_get_type ());
963 g_type_class_ref (gst_type_find_factory_get_type ());
964 g_type_class_ref (gst_bin_get_type ());
966 #ifndef GST_DISABLE_INDEX
967 g_type_class_ref (gst_index_factory_get_type ());
968 #endif /* GST_DISABLE_INDEX */
969 #ifndef GST_DISABLE_URI
970 gst_uri_handler_get_type ();
971 #endif /* GST_DISABLE_URI */
973 gst_structure_get_type ();
974 _gst_value_initialize ();
975 g_type_class_ref (gst_param_spec_fraction_get_type ());
976 gst_caps_get_type ();
977 _gst_event_initialize ();
978 _gst_buffer_initialize ();
979 _gst_message_initialize ();
980 _gst_tag_initialize ();
982 _gst_plugin_initialize ();
984 /* register core plugins */
985 gst_plugin_register_static (GST_VERSION_MAJOR, GST_VERSION_MINOR,
986 "staticelements", "core elements linked into the GStreamer library",
987 gst_register_core_elements, VERSION, GST_LICENSE, PACKAGE,
988 GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
991 * Any errors happening below this point are non-fatal, we therefore mark
992 * gstreamer as being initialized, since it is the case from a plugin point of
995 * If anything fails, it will be put back to FALSE in gst_init_check().
996 * This allows some special plugins that would call gst_init() to not cause a
997 * looping effect (i.e. initializing GStreamer twice).
999 gst_initialized = TRUE;
1001 #ifndef GST_DISABLE_REGISTRY
1002 if (!ensure_current_registry (error))
1004 #endif /* GST_DISABLE_REGISTRY */
1006 /* if we need to preload plugins, do so now */
1007 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1008 /* keep preload_plugins around in case a re-scan is forced later on */
1010 #ifndef GST_DISABLE_TRACE
1012 if (_gst_trace_on) {
1013 gst_trace = gst_trace_new ("gst.trace", 1024);
1014 gst_trace_set_default (gst_trace);
1016 #endif /* GST_DISABLE_TRACE */
1021 #ifndef GST_DISABLE_GST_DEBUG
1023 select_all (GstPlugin * plugin, gpointer user_data)
1029 sort_by_category_name (gconstpointer a, gconstpointer b)
1031 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
1032 gst_debug_category_get_name ((GstDebugCategory *) b));
1036 gst_debug_help (void)
1038 GSList *list, *walk;
1041 /* Need to ensure the registry is loaded to get debug categories */
1042 if (!init_post (NULL, NULL, NULL, NULL))
1045 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
1046 select_all, FALSE, NULL);
1048 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
1049 for (g = list2; g; g = g_list_next (g)) {
1050 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
1052 gst_plugin_load (plugin);
1054 g_list_free (list2);
1056 list = gst_debug_get_all_categories ();
1057 walk = list = g_slist_sort (list, sort_by_category_name);
1060 g_print ("name level description\n");
1061 g_print ("---------------------+--------+--------------------------------\n");
1064 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
1066 if (gst_debug_is_colored ()) {
1067 gchar *color = gst_debug_construct_term_color (cat->color);
1069 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
1071 gst_debug_category_get_name (cat),
1072 gst_debug_category_get_threshold (cat),
1073 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1074 color, gst_debug_category_get_description (cat));
1077 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
1078 gst_debug_category_get_threshold (cat),
1079 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1080 gst_debug_category_get_description (cat));
1082 walk = g_slist_next (walk);
1084 g_slist_free (list);
1089 #ifndef GST_DISABLE_OPTION_PARSING
1091 parse_one_option (gint opt, const gchar * arg, GError ** err)
1095 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
1097 case ARG_FATAL_WARNINGS:{
1098 GLogLevelFlags fatal_mask;
1100 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1101 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1102 g_log_set_always_fatal (fatal_mask);
1105 #ifndef GST_DISABLE_GST_DEBUG
1106 case ARG_DEBUG_LEVEL:{
1109 tmp = strtol (arg, NULL, 0);
1110 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1111 gst_debug_set_default_threshold (tmp);
1116 parse_debug_list (arg);
1118 case ARG_DEBUG_NO_COLOR:
1119 gst_debug_set_colored (FALSE);
1121 case ARG_DEBUG_DISABLE:
1122 gst_debug_set_active (FALSE);
1124 case ARG_DEBUG_HELP:
1128 case ARG_PLUGIN_SPEW:
1130 case ARG_PLUGIN_PATH:
1131 #ifndef GST_DISABLE_REGISTRY
1132 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1133 #endif /* GST_DISABLE_REGISTRY */
1135 case ARG_PLUGIN_LOAD:
1136 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1138 case ARG_SEGTRAP_DISABLE:
1139 _gst_disable_segtrap = TRUE;
1141 case ARG_REGISTRY_FORK_DISABLE:
1142 _gst_enable_registry_fork = FALSE;
1145 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1146 _("Unknown option"));
1154 parse_goption_arg (const gchar * opt,
1155 const gchar * arg, gpointer data, GError ** err)
1163 "--gst-version", ARG_VERSION}, {
1164 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1165 #ifndef GST_DISABLE_GST_DEBUG
1167 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1168 "--gst-debug", ARG_DEBUG}, {
1169 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1170 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1171 "--gst-debug-help", ARG_DEBUG_HELP},
1174 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1175 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1176 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1177 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1178 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1183 for (n = 0; options[n].opt; n++) {
1184 if (!strcmp (opt, options[n].opt)) {
1185 val = options[n].val;
1190 return parse_one_option (val, arg, err);
1194 extern GstRegistry *_gst_registry_default;
1199 * Clean up any resources created by GStreamer in gst_init().
1201 * It is normally not needed to call this function in a normal application
1202 * as the resources will automatically be freed when the program terminates.
1203 * This function is therefore mostly used by testsuites and other memory
1206 * After this call GStreamer (including this method) should not be used anymore.
1213 GST_INFO ("deinitializing GStreamer");
1215 if (gst_deinitialized) {
1216 GST_DEBUG ("already deinitialized");
1220 g_slist_foreach (preload_plugins, (GFunc) g_free, NULL);
1221 g_slist_free (preload_plugins);
1222 preload_plugins = NULL;
1224 #ifndef GST_DISABLE_REGISTRY
1225 g_list_foreach (plugin_paths, (GFunc) g_free, NULL);
1226 g_list_free (plugin_paths);
1227 plugin_paths = NULL;
1230 clock = gst_system_clock_obtain ();
1231 gst_object_unref (clock);
1232 gst_object_unref (clock);
1234 _priv_gst_registry_cleanup ();
1236 g_type_class_unref (g_type_class_peek (gst_object_get_type ()));
1237 g_type_class_unref (g_type_class_peek (gst_pad_get_type ()));
1238 g_type_class_unref (g_type_class_peek (gst_element_factory_get_type ()));
1239 g_type_class_unref (g_type_class_peek (gst_element_get_type ()));
1240 g_type_class_unref (g_type_class_peek (gst_type_find_factory_get_type ()));
1241 g_type_class_unref (g_type_class_peek (gst_bin_get_type ()));
1242 #ifndef GST_DISABLE_INDEX
1243 g_type_class_unref (g_type_class_peek (gst_index_factory_get_type ()));
1244 #endif /* GST_DISABLE_INDEX */
1245 g_type_class_unref (g_type_class_peek (gst_param_spec_fraction_get_type ()));
1247 gst_deinitialized = TRUE;
1248 GST_INFO ("deinitialized GStreamer");
1253 * @major: pointer to a guint to store the major version number
1254 * @minor: pointer to a guint to store the minor version number
1255 * @micro: pointer to a guint to store the micro version number
1256 * @nano: pointer to a guint to store the nano version number
1258 * Gets the version number of the GStreamer library.
1261 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1263 g_return_if_fail (major);
1264 g_return_if_fail (minor);
1265 g_return_if_fail (micro);
1266 g_return_if_fail (nano);
1268 *major = GST_VERSION_MAJOR;
1269 *minor = GST_VERSION_MINOR;
1270 *micro = GST_VERSION_MICRO;
1271 *nano = GST_VERSION_NANO;
1275 * gst_version_string:
1277 * This function returns a string that is useful for describing this version
1278 * of GStreamer to the outside world: user agent strings, logging, ...
1280 * Returns: a newly allocated string describing this version of GStreamer.
1284 gst_version_string ()
1286 guint major, minor, micro, nano;
1288 gst_version (&major, &minor, µ, &nano);
1290 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1292 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1294 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1299 * gst_segtrap_is_enabled:
1301 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1302 * to better catch and report errors to the application. Currently this feature
1303 * is enabled by default when loading plugins.
1305 * Applications might want to disable this behaviour with the
1306 * gst_segtrap_set_enabled() function. This is typically done if the application
1307 * wants to install its own handler without GStreamer interfering.
1309 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1314 gst_segtrap_is_enabled (void)
1316 /* yeps, it's enabled when it's not disabled */
1317 return !_gst_disable_segtrap;
1321 * gst_segtrap_set_enabled:
1322 * @enabled: whether a custom SIGSEGV handler should be installed.
1324 * Applications might want to disable/enable the SIGSEGV handling of
1325 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1330 gst_segtrap_set_enabled (gboolean enabled)
1332 _gst_disable_segtrap = !enabled;
1336 * gst_registry_fork_is_enabled:
1338 * By default GStreamer will perform a fork() when scanning and rebuilding the
1341 * Applications might want to disable this behaviour with the
1342 * gst_registry_fork_set_enabled() function.
1344 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1345 * platforms without fork(), this function will always return %FALSE.
1350 gst_registry_fork_is_enabled (void)
1352 return _gst_enable_registry_fork;
1356 * gst_registry_fork_set_enabled:
1357 * @enabled: whether rebuilding the registry may fork
1359 * Applications might want to disable/enable the usage of fork() when rebuilding
1360 * the registry. See gst_registry_fork_is_enabled() for more information.
1362 * On platforms without fork(), this function will have no effect on the return
1363 * value of gst_registry_fork_is_enabled().
1368 gst_registry_fork_set_enabled (gboolean enabled)
1371 _gst_enable_registry_fork = enabled;
1372 #endif /* HAVE_FORK */
1377 * gst_update_registry:
1379 * Forces GStreamer to re-scan its plugin paths and update the default
1382 * Applications will almost never need to call this function, it is only
1383 * useful if the application knows new plugins have been installed (or old
1384 * ones removed) since the start of the application (or, to be precise, the
1385 * first call to gst_init()) and the application wants to make use of any
1386 * newly-installed plugins without restarting the application.
1388 * Applications should assume that the registry update is neither atomic nor
1389 * thread-safe and should therefore not have any dynamic pipelines running
1390 * (including the playbin and decodebin elements) and should also not create
1391 * any elements or access the GStreamer registry while the update is in
1394 * Note that this function may block for a significant amount of time.
1396 * Returns: %TRUE if the registry has been updated successfully (does not
1397 * imply that there were changes), otherwise %FALSE.
1402 gst_update_registry (void)
1404 gboolean res = FALSE;
1406 #ifndef GST_DISABLE_REGISTRY
1409 res = ensure_current_registry (&err);
1411 GST_WARNING ("registry update failed: %s", err->message);
1414 GST_LOG ("registry update succeeded");
1417 if (preload_plugins) {
1418 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1421 GST_WARNING ("registry update failed: %s", "registry disabled");
1422 #endif /* GST_DISABLE_REGISTRY */