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;
132 #ifndef GST_DISABLE_REGISTRY
133 static GList *plugin_paths = NULL; /* for delayed processing in post_init */
136 extern gint _gst_trace_on;
140 #define DEFAULT_FORK TRUE
142 #define DEFAULT_FORK FALSE
143 #endif /* HAVE_FORK */
145 /* set to TRUE when segfaults need to be left as is, FIXME, this variable is
147 gboolean _gst_disable_segtrap = FALSE;
149 /* control the behaviour of registry rebuild */
150 static gboolean _gst_enable_registry_fork = DEFAULT_FORK;
152 static void load_plugin_func (gpointer data, gpointer user_data);
153 static gboolean init_pre (GOptionContext * context, GOptionGroup * group,
154 gpointer data, GError ** error);
155 static gboolean init_post (GOptionContext * context, GOptionGroup * group,
156 gpointer data, GError ** error);
157 #ifndef GST_DISABLE_OPTION_PARSING
158 static gboolean parse_goption_arg (const gchar * s_opt,
159 const gchar * arg, gpointer data, GError ** err);
162 static GSList *preload_plugins = NULL;
164 const gchar g_log_domain_gstreamer[] = "GStreamer";
167 debug_log_handler (const gchar * log_domain,
168 GLogLevelFlags log_level, const gchar * message, gpointer user_data)
170 g_log_default_handler (log_domain, log_level, message, user_data);
171 /* FIXME: do we still need this ? fatal errors these days are all
172 * other than core errors */
173 /* g_on_error_query (NULL); */
180 #ifndef GST_DISABLE_GST_DEBUG
191 ARG_REGISTRY_FORK_DISABLE
194 /* debug-spec ::= category-spec [, category-spec]*
195 * category-spec ::= category:val | val
204 #ifndef GST_DISABLE_GST_DEBUG
206 parse_debug_category (gchar * str, const gchar ** category)
223 parse_debug_level (gchar * str, gint * level)
231 if (str[0] != NUL && str[1] == NUL
232 && str[0] >= '0' && str[0] < '0' + GST_LEVEL_COUNT) {
233 *level = str[0] - '0';
241 parse_debug_list (const gchar * list)
246 g_return_if_fail (list != NULL);
248 split = g_strsplit (list, ",", 0);
250 for (walk = split; *walk; walk++) {
251 if (strchr (*walk, ':')) {
252 gchar **values = g_strsplit (*walk, ":", 2);
254 if (values[0] && values[1]) {
256 const gchar *category;
258 if (parse_debug_category (values[0], &category)
259 && parse_debug_level (values[1], &level))
260 gst_debug_set_threshold_for_name (category, level);
267 if (parse_debug_level (*walk, &level))
268 gst_debug_set_default_threshold (level);
277 * gst_init_get_option_group:
279 * Returns a #GOptionGroup with GStreamer's argument specifications. The
280 * group is set up to use standard GOption callbacks, so when using this
281 * group in combination with GOption parsing methods, all argument parsing
282 * and initialization is automated.
284 * This function is useful if you want to integrate GStreamer with other
285 * libraries that use GOption (see g_option_context_add_group() ).
287 * If you use this function, you should make sure you initialise the GLib
288 * threading system as one of the very first things in your program
289 * (see the example at the beginning of this section).
291 * Returns: a pointer to GStreamer's option group.
295 gst_init_get_option_group (void)
297 #ifndef GST_DISABLE_OPTION_PARSING
299 const static GOptionEntry gst_args[] = {
300 {"gst-version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
301 (gpointer) parse_goption_arg, N_("Print the GStreamer version"), NULL},
302 {"gst-fatal-warnings", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
303 (gpointer) parse_goption_arg, N_("Make all warnings fatal"), NULL},
304 #ifndef GST_DISABLE_GST_DEBUG
305 {"gst-debug-help", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
306 (gpointer) parse_goption_arg,
307 N_("Print available debug categories and exit"),
309 {"gst-debug-level", 0, 0, G_OPTION_ARG_CALLBACK,
310 (gpointer) parse_goption_arg,
311 N_("Default debug level from 1 (only error) to 5 (anything) or "
314 {"gst-debug", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) parse_goption_arg,
315 N_("Comma-separated list of category_name:level pairs to set "
316 "specific levels for the individual categories. Example: "
317 "GST_AUTOPLUG:5,GST_ELEMENT_*:3"),
319 {"gst-debug-no-color", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
320 (gpointer) parse_goption_arg, N_("Disable colored debugging output"),
322 {"gst-debug-disable", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
323 (gpointer) parse_goption_arg, N_("Disable debugging"), NULL},
325 {"gst-plugin-spew", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
326 (gpointer) parse_goption_arg,
327 N_("Enable verbose plugin loading diagnostics"),
329 {"gst-plugin-path", 0, 0, G_OPTION_ARG_CALLBACK,
330 (gpointer) parse_goption_arg,
331 N_("Colon-separated paths containing plugins"), N_("PATHS")},
332 {"gst-plugin-load", 0, 0, G_OPTION_ARG_CALLBACK,
333 (gpointer) parse_goption_arg,
334 N_("Comma-separated list of plugins to preload in addition to the "
335 "list stored in environment variable GST_PLUGIN_PATH"),
337 {"gst-disable-segtrap", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
338 (gpointer) parse_goption_arg,
339 N_("Disable trapping of segmentation faults during plugin loading"),
341 {"gst-disable-registry-fork", 0, G_OPTION_FLAG_NO_ARG,
342 G_OPTION_ARG_CALLBACK,
343 (gpointer) parse_goption_arg,
344 N_("Disable the use of fork() while scanning the registry"),
349 /* The GLib threading system must be initialised before calling any other
350 * GLib function according to the documentation; if the application hasn't
351 * called gst_init() yet or initialised the threading system otherwise, we
352 * better issue a warning here (since chances are high that the application
353 * has already called other GLib functions such as g_option_context_new() */
354 if (!g_thread_supported ()) {
355 g_warning ("The GStreamer function gst_init_get_option_group() was\n"
356 "\tcalled, but the GLib threading system has not been initialised\n"
357 "\tyet, something that must happen before any other GLib function\n"
358 "\tis called. The application needs to be fixed so that it calls\n"
359 "\t if (!g_thread_supported ()) g_thread_init(NULL);\n"
360 "\tas very first thing in its main() function. Please file a bug\n"
361 "\tagainst this application.");
362 g_thread_init (NULL);
365 group = g_option_group_new ("gst", _("GStreamer Options"),
366 _("Show GStreamer Options"), NULL, NULL);
367 g_option_group_set_parse_hooks (group, (GOptionParseFunc) init_pre,
368 (GOptionParseFunc) init_post);
370 g_option_group_add_entries (group, gst_args);
371 g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
381 * @argc: pointer to application's argc
382 * @argv: pointer to application's argv
383 * @err: pointer to a #GError to which a message will be posted on error
385 * Initializes the GStreamer library, setting up internal path lists,
386 * registering built-in elements, and loading standard plugins.
388 * This function will return %FALSE if GStreamer could not be initialized
389 * for some reason. If you want your program to fail fatally,
390 * use gst_init() instead.
392 * This function should be called before calling any other GLib functions. If
393 * this is not an option, your program must initialise the GLib thread system
394 * using g_thread_init() before any other GLib functions are called.
396 * Returns: %TRUE if GStreamer could be initialized.
399 gst_init_check (int *argc, char **argv[], GError ** err)
401 #ifndef GST_DISABLE_OPTION_PARSING
407 if (!g_thread_supported ())
408 g_thread_init (NULL);
410 GST_INFO ("initializing GStreamer");
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 /* This is the earliest we can make stuff show up in the logs.
593 * So give some useful info about GStreamer here */
594 GST_INFO ("Initializing GStreamer Core Library version %s", VERSION);
595 GST_INFO ("Using library installed in %s", LIBDIR);
597 /* Print some basic system details if possible (OS/architecture) */
598 #ifdef HAVE_SYS_UTSNAME_H
600 struct utsname sys_details;
602 if (uname (&sys_details) == 0) {
603 GST_INFO ("%s %s %s %s %s", sys_details.sysname,
604 sys_details.nodename, sys_details.release, sys_details.version,
605 sys_details.machine);
614 gst_register_core_elements (GstPlugin * plugin)
616 /* register some standard builtin types */
617 if (!gst_element_register (plugin, "bin", GST_RANK_PRIMARY,
619 !gst_element_register (plugin, "pipeline", GST_RANK_PRIMARY,
622 g_assert_not_reached ();
627 static GstPluginDesc plugin_desc = {
631 "core elements linked into the GStreamer library",
632 gst_register_core_elements,
642 #ifndef GST_DISABLE_REGISTRY
646 REGISTRY_SCAN_AND_UPDATE_FAILURE = 0,
647 REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED,
648 REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED
649 } GstRegistryScanAndUpdateResult;
652 * scan_and_update_registry:
653 * @default_registry: the #GstRegistry
654 * @registry_file: registry filename
655 * @write_changes: write registry if it has changed?
657 * Scans for registry changes and eventually updates the registry cache.
659 * Return: %REGISTRY_SCAN_AND_UPDATE_FAILURE if the registry could not scanned
660 * or updated, %REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED if the
661 * registry is clean and %REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED if
662 * it has been updated and the cache needs to be re-read.
664 static GstRegistryScanAndUpdateResult
665 scan_and_update_registry (GstRegistry * default_registry,
666 const gchar * registry_file, gboolean write_changes, GError ** error)
668 const gchar *plugin_path;
669 gboolean changed = FALSE;
672 /* scan paths specified via --gst-plugin-path */
673 GST_DEBUG ("scanning paths added via --gst-plugin-path");
674 for (l = plugin_paths; l != NULL; l = l->next) {
675 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
676 /* CHECKME: add changed |= here as well? */
677 gst_registry_scan_path (default_registry, (gchar *) l->data);
679 /* keep plugin_paths around in case a re-scan is forced later on */
681 /* GST_PLUGIN_PATH specifies a list of directories to scan for
682 * additional plugins. These take precedence over the system plugins */
683 plugin_path = g_getenv ("GST_PLUGIN_PATH");
688 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
689 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
690 for (i = 0; list[i]; i++) {
691 changed |= gst_registry_scan_path (default_registry, list[i]);
695 GST_DEBUG ("GST_PLUGIN_PATH not set");
698 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
699 * loaded by default. If not set, this defaults to the system-installed
700 * path, and the plugins installed in the user's home directory */
701 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
702 if (plugin_path == NULL) {
705 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
707 /* plugins in the user's home directory take precedence over
708 * system-installed ones */
709 home_plugins = g_build_filename (g_get_home_dir (),
710 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
711 GST_DEBUG ("scanning home plugins %s", home_plugins);
712 changed |= gst_registry_scan_path (default_registry, home_plugins);
713 g_free (home_plugins);
715 /* add the main (installed) library path */
716 GST_DEBUG ("scanning main plugins %s", PLUGINDIR);
717 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
722 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
723 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
724 for (i = 0; list[i]; i++) {
725 changed |= gst_registry_scan_path (default_registry, list[i]);
730 /* Remove cached plugins so stale info is cleared. */
731 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
734 GST_INFO ("Registry cache has not changed");
735 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED;
738 if (!write_changes) {
739 GST_INFO ("Registry cached changed, but writing is disabled. Not writing.");
740 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
743 GST_INFO ("Registry cache changed. Writing new registry cache");
744 #ifdef USE_BINARY_REGISTRY
745 if (!gst_registry_binary_write_cache (default_registry, registry_file)) {
747 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
749 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
750 _("Error writing registry cache to %s: %s"),
751 registry_file, g_strerror (errno));
752 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
755 GST_INFO ("Registry cache written successfully");
756 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED;
760 ensure_current_registry_nonforking (GstRegistry * default_registry,
761 const gchar * registry_file, GError ** error)
763 /* fork() not available */
764 GST_INFO ("reading registry cache: %s", registry_file);
765 #ifdef USE_BINARY_REGISTRY
766 gst_registry_binary_read_cache (default_registry, registry_file);
768 gst_registry_xml_read_cache (default_registry, registry_file);
770 GST_DEBUG ("Updating registry cache in-process");
771 scan_and_update_registry (default_registry, registry_file, TRUE, error);
775 /* when forking is not available this function always does nothing but return
778 ensure_current_registry_forking (GstRegistry * default_registry,
779 const gchar * registry_file, GError ** error)
786 /* We fork here, and let the child read and possibly rebuild the registry.
787 * After that, the parent will re-read the freshly generated registry. */
788 GST_DEBUG ("forking to update registry");
790 if (pipe (pfd) == -1) {
791 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
792 _("Error re-scanning registry %s: %s"),
793 ", could not create pipes. Error", g_strerror (errno));
797 GST_INFO ("reading registry cache: %s", registry_file);
798 #ifdef USE_BINARY_REGISTRY
799 gst_registry_binary_read_cache (default_registry, registry_file);
801 gst_registry_xml_read_cache (default_registry, registry_file);
806 GST_ERROR ("Failed to fork()");
807 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
808 _("Error re-scanning registry %s: %s"),
809 ", failed to fork. Error", g_strerror (errno));
816 /* this is the child. Close the read pipe */
817 (void) close (pfd[0]);
819 GST_DEBUG ("child reading registry cache");
821 scan_and_update_registry (default_registry, registry_file, TRUE, NULL);
823 /* need to use _exit, so that any exit handlers registered don't
824 * bring down the main program */
825 GST_DEBUG ("child exiting: %d", result_code);
827 /* make valgrind happy (yes, you can call it insane) */
828 g_free ((char *) registry_file);
830 /* write a result byte to the pipe */
832 ret = write (pfd[1], &result_code, sizeof (result_code));
833 } while (ret == -1 && errno == EINTR);
834 /* if ret == -1 now, we could not write to pipe, probably
835 * means parent has exited before us */
836 (void) close (pfd[1]);
842 /* parent. Close write pipe */
843 (void) close (pfd[1]);
845 /* Wait for result from the pipe */
846 GST_DEBUG ("Waiting for data from child");
848 ret = read (pfd[0], &result_code, sizeof (result_code));
849 } while (ret == -1 && errno == EINTR);
852 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
853 _("Error re-scanning registry %s: %s"),
854 ", read returned error", g_strerror (errno));
858 (void) close (pfd[0]);
860 /* Wait to ensure the child is reaped, but ignore the result */
861 GST_DEBUG ("parent waiting on child");
862 waitpid (pid, NULL, 0);
863 GST_DEBUG ("parent done waiting on child");
866 GST_ERROR ("child did not exit normally, terminated by signal");
867 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
868 _("Error re-scanning registry %s"), ", child terminated by signal");
872 if (result_code == REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED) {
873 GST_DEBUG ("Child succeeded. Parent reading registry cache");
874 _priv_gst_registry_remove_cache_plugins (default_registry);
875 #ifdef USE_BINARY_REGISTRY
876 gst_registry_binary_read_cache (default_registry, registry_file);
878 gst_registry_xml_read_cache (default_registry, registry_file);
880 } else if (result_code == REGISTRY_SCAN_AND_UPDATE_FAILURE) {
881 GST_DEBUG ("Child failed. Parent re-scanning registry, ignoring errors.");
882 scan_and_update_registry (default_registry, registry_file, FALSE, NULL);
885 #endif /* HAVE_FORK */
890 ensure_current_registry (GError ** error)
893 GstRegistry *default_registry;
897 default_registry = gst_registry_get_default ();
898 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
899 if (registry_file == NULL) {
900 #ifdef USE_BINARY_REGISTRY
901 registry_file = g_build_filename (g_get_home_dir (),
902 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".bin", NULL);
904 registry_file = g_build_filename (g_get_home_dir (),
905 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
909 /* first see if forking is enabled */
910 do_fork = _gst_enable_registry_fork;
912 const gchar *fork_env;
914 /* forking enabled, see if it is disabled with an env var */
915 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
916 /* fork enabled for any value different from "no" */
917 do_fork = strcmp (fork_env, "no") != 0;
921 /* now check registry with or without forking */
923 GST_DEBUG ("forking for registry rebuild");
924 ret = ensure_current_registry_forking (default_registry, registry_file,
927 GST_DEBUG ("requested not to fork for registry rebuild");
928 ret = ensure_current_registry_nonforking (default_registry, registry_file,
932 g_free (registry_file);
936 #endif /* GST_DISABLE_REGISTRY */
940 * - initalization of threads if we use them
943 * - initializes gst_format
944 * - registers a bunch of types for gst_objects
946 * - we don't have cases yet where this fails, but in the future
947 * we might and then it's nice to be able to return that
950 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
955 #ifndef GST_DISABLE_TRACE
957 #endif /* GST_DISABLE_TRACE */
959 if (gst_initialized) {
960 GST_DEBUG ("already initialized");
964 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
965 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
967 _priv_gst_quarks_initialize ();
968 _gst_format_initialize ();
969 _gst_query_initialize ();
970 gst_object_get_type ();
972 gst_element_factory_get_type ();
973 gst_element_get_type ();
974 gst_type_find_factory_get_type ();
977 #ifndef GST_DISABLE_INDEX
978 gst_index_factory_get_type ();
979 #endif /* GST_DISABLE_INDEX */
980 #ifndef GST_DISABLE_URI
981 gst_uri_handler_get_type ();
982 #endif /* GST_DISABLE_URI */
984 gst_structure_get_type ();
985 _gst_value_initialize ();
986 gst_param_spec_fraction_get_type ();
987 gst_caps_get_type ();
988 _gst_event_initialize ();
989 _gst_buffer_initialize ();
990 _gst_message_initialize ();
991 _gst_tag_initialize ();
993 /* register core plugins */
994 _gst_plugin_register_static (&plugin_desc);
996 _gst_plugin_initialize ();
999 * Any errors happening below this point are non-fatal, we therefore mark
1000 * gstreamer as being initialized, since it is the case from a plugin point of
1003 * If anything fails, it will be put back to FALSE in gst_init_check().
1004 * This allows some special plugins that would call gst_init() to not cause a
1005 * looping effect (i.e. initializing GStreamer twice).
1007 gst_initialized = TRUE;
1009 #ifndef GST_DISABLE_REGISTRY
1010 if (!ensure_current_registry (error))
1012 #endif /* GST_DISABLE_REGISTRY */
1014 /* if we need to preload plugins, do so now */
1015 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1016 /* keep preload_plugins around in case a re-scan is forced later on */
1018 #ifndef GST_DISABLE_TRACE
1020 if (_gst_trace_on) {
1021 gst_trace = gst_trace_new ("gst.trace", 1024);
1022 gst_trace_set_default (gst_trace);
1024 #endif /* GST_DISABLE_TRACE */
1029 #ifndef GST_DISABLE_GST_DEBUG
1031 select_all (GstPlugin * plugin, gpointer user_data)
1037 sort_by_category_name (gconstpointer a, gconstpointer b)
1039 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
1040 gst_debug_category_get_name ((GstDebugCategory *) b));
1044 gst_debug_help (void)
1046 GSList *list, *walk;
1049 /* Need to ensure the registry is loaded to get debug categories */
1050 if (!init_post (NULL, NULL, NULL, NULL))
1053 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
1054 select_all, FALSE, NULL);
1056 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
1057 for (g = list2; g; g = g_list_next (g)) {
1058 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
1060 gst_plugin_load (plugin);
1062 g_list_free (list2);
1064 list = gst_debug_get_all_categories ();
1065 walk = list = g_slist_sort (list, sort_by_category_name);
1068 g_print ("name level description\n");
1069 g_print ("---------------------+--------+--------------------------------\n");
1072 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
1074 if (gst_debug_is_colored ()) {
1075 gchar *color = gst_debug_construct_term_color (cat->color);
1077 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
1079 gst_debug_category_get_name (cat),
1080 gst_debug_category_get_threshold (cat),
1081 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1082 color, gst_debug_category_get_description (cat));
1085 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
1086 gst_debug_category_get_threshold (cat),
1087 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1088 gst_debug_category_get_description (cat));
1090 walk = g_slist_next (walk);
1092 g_slist_free (list);
1097 #ifndef GST_DISABLE_OPTION_PARSING
1099 parse_one_option (gint opt, const gchar * arg, GError ** err)
1103 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
1105 case ARG_FATAL_WARNINGS:{
1106 GLogLevelFlags fatal_mask;
1108 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1109 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1110 g_log_set_always_fatal (fatal_mask);
1113 #ifndef GST_DISABLE_GST_DEBUG
1114 case ARG_DEBUG_LEVEL:{
1117 tmp = strtol (arg, NULL, 0);
1118 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1119 gst_debug_set_default_threshold (tmp);
1124 parse_debug_list (arg);
1126 case ARG_DEBUG_NO_COLOR:
1127 gst_debug_set_colored (FALSE);
1129 case ARG_DEBUG_DISABLE:
1130 gst_debug_set_active (FALSE);
1132 case ARG_DEBUG_HELP:
1136 case ARG_PLUGIN_SPEW:
1138 case ARG_PLUGIN_PATH:
1139 #ifndef GST_DISABLE_REGISTRY
1140 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1141 #endif /* GST_DISABLE_REGISTRY */
1143 case ARG_PLUGIN_LOAD:
1144 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1146 case ARG_SEGTRAP_DISABLE:
1147 _gst_disable_segtrap = TRUE;
1149 case ARG_REGISTRY_FORK_DISABLE:
1150 _gst_enable_registry_fork = FALSE;
1153 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1154 _("Unknown option"));
1162 parse_goption_arg (const gchar * opt,
1163 const gchar * arg, gpointer data, GError ** err)
1171 "--gst-version", ARG_VERSION}, {
1172 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1173 #ifndef GST_DISABLE_GST_DEBUG
1175 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1176 "--gst-debug", ARG_DEBUG}, {
1177 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1178 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1179 "--gst-debug-help", ARG_DEBUG_HELP},
1182 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1183 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1184 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1185 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1186 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1191 for (n = 0; options[n].opt; n++) {
1192 if (!strcmp (opt, options[n].opt)) {
1193 val = options[n].val;
1198 return parse_one_option (val, arg, err);
1202 extern GstRegistry *_gst_registry_default;
1207 * Clean up any resources created by GStreamer in gst_init().
1209 * It is normally not needed to call this function in a normal application
1210 * as the resources will automatically be freed when the program terminates.
1211 * This function is therefore mostly used by testsuites and other memory
1214 * After this call GStreamer (including this method) should not be used anymore.
1221 GST_INFO ("deinitializing GStreamer");
1223 if (!gst_initialized) {
1224 GST_DEBUG ("already deinitialized");
1228 g_slist_foreach (preload_plugins, (GFunc) g_free, NULL);
1229 g_slist_free (preload_plugins);
1230 preload_plugins = NULL;
1232 #ifndef GST_DISABLE_REGISTRY
1233 g_list_foreach (plugin_paths, (GFunc) g_free, NULL);
1234 g_list_free (plugin_paths);
1235 plugin_paths = NULL;
1238 clock = gst_system_clock_obtain ();
1239 gst_object_unref (clock);
1240 gst_object_unref (clock);
1242 _priv_gst_registry_cleanup ();
1244 gst_initialized = FALSE;
1245 GST_INFO ("deinitialized GStreamer");
1250 * @major: pointer to a guint to store the major version number
1251 * @minor: pointer to a guint to store the minor version number
1252 * @micro: pointer to a guint to store the micro version number
1253 * @nano: pointer to a guint to store the nano version number
1255 * Gets the version number of the GStreamer library.
1258 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1260 g_return_if_fail (major);
1261 g_return_if_fail (minor);
1262 g_return_if_fail (micro);
1263 g_return_if_fail (nano);
1265 *major = GST_VERSION_MAJOR;
1266 *minor = GST_VERSION_MINOR;
1267 *micro = GST_VERSION_MICRO;
1268 *nano = GST_VERSION_NANO;
1272 * gst_version_string:
1274 * This function returns a string that is useful for describing this version
1275 * of GStreamer to the outside world: user agent strings, logging, ...
1277 * Returns: a newly allocated string describing this version of GStreamer.
1281 gst_version_string ()
1283 guint major, minor, micro, nano;
1285 gst_version (&major, &minor, µ, &nano);
1287 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1289 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1291 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1296 * gst_segtrap_is_enabled:
1298 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1299 * to better catch and report errors to the application. Currently this feature
1300 * is enabled by default when loading plugins.
1302 * Applications might want to disable this behaviour with the
1303 * gst_segtrap_set_enabled() function. This is typically done if the application
1304 * wants to install its own handler without GStreamer interfering.
1306 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1311 gst_segtrap_is_enabled (void)
1313 /* yeps, it's enabled when it's not disabled */
1314 return !_gst_disable_segtrap;
1318 * gst_segtrap_set_enabled:
1319 * @enabled: whether a custom SIGSEGV handler should be installed.
1321 * Applications might want to disable/enable the SIGSEGV handling of
1322 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1327 gst_segtrap_set_enabled (gboolean enabled)
1329 _gst_disable_segtrap = !enabled;
1333 * gst_registry_fork_is_enabled:
1335 * By default GStreamer will perform a fork() when scanning and rebuilding the
1338 * Applications might want to disable this behaviour with the
1339 * gst_registry_fork_set_enabled() function.
1341 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1342 * platforms without fork(), this function will always return %FALSE.
1347 gst_registry_fork_is_enabled (void)
1349 return _gst_enable_registry_fork;
1353 * gst_registry_fork_set_enabled:
1354 * @enabled: whether rebuilding the registry may fork
1356 * Applications might want to disable/enable the usage of fork() when rebuilding
1357 * the registry. See gst_registry_fork_is_enabled() for more information.
1359 * On platforms without fork(), this function will have no effect on the return
1360 * value of gst_registry_fork_is_enabled().
1365 gst_registry_fork_set_enabled (gboolean enabled)
1368 _gst_enable_registry_fork = enabled;
1369 #endif /* HAVE_FORK */
1374 * gst_update_registry:
1376 * Forces GStreamer to re-scan its plugin paths and update the default
1379 * Applications will almost never need to call this function, it is only
1380 * useful if the application knows new plugins have been installed (or old
1381 * ones removed) since the start of the application (or, to be precise, the
1382 * first call to gst_init()) and the application wants to make use of any
1383 * newly-installed plugins without restarting the application.
1385 * Applications should assume that the registry update is neither atomic nor
1386 * thread-safe and should therefore not have any dynamic pipelines running
1387 * (including the playbin and decodebin elements) and should also not create
1388 * any elements or access the GStreamer registry while the update is in
1391 * Note that this function may block for a significant amount of time.
1393 * Returns: %TRUE if the registry has been updated successfully (does not
1394 * imply that there were changes), otherwise %FALSE.
1399 gst_update_registry (void)
1401 gboolean res = FALSE;
1403 #ifndef GST_DISABLE_REGISTRY
1406 res = ensure_current_registry (&err);
1408 GST_WARNING ("registry update failed: %s", err->message);
1411 GST_LOG ("registry update succeeded");
1414 if (preload_plugins) {
1415 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1418 GST_WARNING ("registry update failed: %s", "registry disabled");
1419 #endif /* GST_DISABLE_REGISTRY */