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 #ifndef GST_DISABLE_GST_DEBUG
137 extern const gchar *priv_gst_dump_dot_dir;
142 #define DEFAULT_FORK TRUE
144 #define DEFAULT_FORK FALSE
145 #endif /* HAVE_FORK */
147 /* set to TRUE when segfaults need to be left as is */
148 static gboolean _gst_disable_segtrap = FALSE;
150 /* control the behaviour of registry rebuild */
151 static gboolean _gst_enable_registry_fork = DEFAULT_FORK;
153 static void load_plugin_func (gpointer data, gpointer user_data);
154 static gboolean init_pre (GOptionContext * context, GOptionGroup * group,
155 gpointer data, GError ** error);
156 static gboolean init_post (GOptionContext * context, GOptionGroup * group,
157 gpointer data, GError ** error);
158 #ifndef GST_DISABLE_OPTION_PARSING
159 static gboolean parse_goption_arg (const gchar * s_opt,
160 const gchar * arg, gpointer data, GError ** err);
163 static GSList *preload_plugins = NULL;
165 const gchar g_log_domain_gstreamer[] = "GStreamer";
168 debug_log_handler (const gchar * log_domain,
169 GLogLevelFlags log_level, const gchar * message, gpointer user_data)
171 g_log_default_handler (log_domain, log_level, message, user_data);
172 /* FIXME: do we still need this ? fatal errors these days are all
173 * other than core errors */
174 /* g_on_error_query (NULL); */
181 #ifndef GST_DISABLE_GST_DEBUG
192 ARG_REGISTRY_FORK_DISABLE
195 /* debug-spec ::= category-spec [, category-spec]*
196 * category-spec ::= category:val | val
205 #ifndef GST_DISABLE_GST_DEBUG
207 parse_debug_category (gchar * str, const gchar ** category)
224 parse_debug_level (gchar * str, gint * level)
232 if (str[0] != NUL && str[1] == NUL
233 && str[0] >= '0' && str[0] < '0' + GST_LEVEL_COUNT) {
234 *level = str[0] - '0';
242 parse_debug_list (const gchar * list)
247 g_return_if_fail (list != NULL);
249 split = g_strsplit (list, ",", 0);
251 for (walk = split; *walk; walk++) {
252 if (strchr (*walk, ':')) {
253 gchar **values = g_strsplit (*walk, ":", 2);
255 if (values[0] && values[1]) {
257 const gchar *category;
259 if (parse_debug_category (values[0], &category)
260 && parse_debug_level (values[1], &level))
261 gst_debug_set_threshold_for_name (category, level);
268 if (parse_debug_level (*walk, &level))
269 gst_debug_set_default_threshold (level);
278 * gst_init_get_option_group:
280 * Returns a #GOptionGroup with GStreamer's argument specifications. The
281 * group is set up to use standard GOption callbacks, so when using this
282 * group in combination with GOption parsing methods, all argument parsing
283 * and initialization is automated.
285 * This function is useful if you want to integrate GStreamer with other
286 * libraries that use GOption (see g_option_context_add_group() ).
288 * If you use this function, you should make sure you initialise the GLib
289 * threading system as one of the very first things in your program
290 * (see the example at the beginning of this section).
292 * Returns: a pointer to GStreamer's option group.
296 gst_init_get_option_group (void)
298 #ifndef GST_DISABLE_OPTION_PARSING
300 const static GOptionEntry gst_args[] = {
301 {"gst-version", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
302 (gpointer) parse_goption_arg, N_("Print the GStreamer version"), NULL},
303 {"gst-fatal-warnings", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
304 (gpointer) parse_goption_arg, N_("Make all warnings fatal"), NULL},
305 #ifndef GST_DISABLE_GST_DEBUG
306 {"gst-debug-help", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
307 (gpointer) parse_goption_arg,
308 N_("Print available debug categories and exit"),
310 {"gst-debug-level", 0, 0, G_OPTION_ARG_CALLBACK,
311 (gpointer) parse_goption_arg,
312 N_("Default debug level from 1 (only error) to 5 (anything) or "
315 {"gst-debug", 0, 0, G_OPTION_ARG_CALLBACK, (gpointer) parse_goption_arg,
316 N_("Comma-separated list of category_name:level pairs to set "
317 "specific levels for the individual categories. Example: "
318 "GST_AUTOPLUG:5,GST_ELEMENT_*:3"),
320 {"gst-debug-no-color", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
321 (gpointer) parse_goption_arg, N_("Disable colored debugging output"),
323 {"gst-debug-disable", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
324 (gpointer) parse_goption_arg, N_("Disable debugging"), NULL},
326 {"gst-plugin-spew", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
327 (gpointer) parse_goption_arg,
328 N_("Enable verbose plugin loading diagnostics"),
330 {"gst-plugin-path", 0, 0, G_OPTION_ARG_CALLBACK,
331 (gpointer) parse_goption_arg,
332 N_("Colon-separated paths containing plugins"), N_("PATHS")},
333 {"gst-plugin-load", 0, 0, G_OPTION_ARG_CALLBACK,
334 (gpointer) parse_goption_arg,
335 N_("Comma-separated list of plugins to preload in addition to the "
336 "list stored in environment variable GST_PLUGIN_PATH"),
338 {"gst-disable-segtrap", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK,
339 (gpointer) parse_goption_arg,
340 N_("Disable trapping of segmentation faults during plugin loading"),
342 {"gst-disable-registry-fork", 0, G_OPTION_FLAG_NO_ARG,
343 G_OPTION_ARG_CALLBACK,
344 (gpointer) parse_goption_arg,
345 N_("Disable the use of fork() while scanning the registry"),
350 /* The GLib threading system must be initialised before calling any other
351 * GLib function according to the documentation; if the application hasn't
352 * called gst_init() yet or initialised the threading system otherwise, we
353 * better issue a warning here (since chances are high that the application
354 * has already called other GLib functions such as g_option_context_new() */
355 if (!g_thread_supported ()) {
356 g_warning ("The GStreamer function gst_init_get_option_group() was\n"
357 "\tcalled, but the GLib threading system has not been initialised\n"
358 "\tyet, something that must happen before any other GLib function\n"
359 "\tis called. The application needs to be fixed so that it calls\n"
360 "\t if (!g_thread_supported ()) g_thread_init(NULL);\n"
361 "\tas very first thing in its main() function. Please file a bug\n"
362 "\tagainst this application.");
363 g_thread_init (NULL);
366 group = g_option_group_new ("gst", _("GStreamer Options"),
367 _("Show GStreamer Options"), NULL, NULL);
368 g_option_group_set_parse_hooks (group, (GOptionParseFunc) init_pre,
369 (GOptionParseFunc) init_post);
371 g_option_group_add_entries (group, gst_args);
372 g_option_group_set_translation_domain (group, GETTEXT_PACKAGE);
382 * @argc: pointer to application's argc
383 * @argv: pointer to application's argv
384 * @err: pointer to a #GError to which a message will be posted on error
386 * Initializes the GStreamer library, setting up internal path lists,
387 * registering built-in elements, and loading standard plugins.
389 * This function will return %FALSE if GStreamer could not be initialized
390 * for some reason. If you want your program to fail fatally,
391 * use gst_init() instead.
393 * This function should be called before calling any other GLib functions. If
394 * this is not an option, your program must initialise the GLib thread system
395 * using g_thread_init() before any other GLib functions are called.
397 * Returns: %TRUE if GStreamer could be initialized.
400 gst_init_check (int *argc, char **argv[], GError ** err)
402 #ifndef GST_DISABLE_OPTION_PARSING
408 if (!g_thread_supported ())
409 g_thread_init (NULL);
411 if (gst_initialized) {
412 GST_DEBUG ("already initialized gst");
415 #ifndef GST_DISABLE_OPTION_PARSING
416 ctx = g_option_context_new ("- GStreamer initialization");
417 g_option_context_set_ignore_unknown_options (ctx, TRUE);
418 group = gst_init_get_option_group ();
419 g_option_context_add_group (ctx, group);
420 res = g_option_context_parse (ctx, argc, argv, err);
421 g_option_context_free (ctx);
423 init_pre (NULL, NULL, NULL, NULL);
424 init_post (NULL, NULL, NULL, NULL);
428 gst_initialized = res;
431 GST_INFO ("initialized GStreamer successfully");
433 GST_INFO ("failed to initialize GStreamer");
441 * @argc: pointer to application's argc
442 * @argv: pointer to application's argv
444 * Initializes the GStreamer library, setting up internal path lists,
445 * registering built-in elements, and loading standard plugins.
447 * This function should be called before calling any other GLib functions. If
448 * this is not an option, your program must initialise the GLib thread system
449 * using g_thread_init() before any other GLib functions are called.
452 * This function will terminate your program if it was unable to initialize
453 * GStreamer for some reason. If you want your program to fall back,
454 * use gst_init_check() instead.
457 * WARNING: This function does not work in the same way as corresponding
458 * functions in other glib-style libraries, such as gtk_init(). In
459 * particular, unknown command line options cause this function to
460 * abort program execution.
463 gst_init (int *argc, char **argv[])
467 if (!gst_init_check (argc, argv, &err)) {
468 g_print ("Could not initialize GStreamer: %s\n",
469 err ? err->message : "unknown error occurred");
477 #ifndef GST_DISABLE_REGISTRY
479 add_path_func (gpointer data, gpointer user_data)
481 GST_INFO ("Adding plugin path: \"%s\", will scan later", (gchar *) data);
482 plugin_paths = g_list_append (plugin_paths, g_strdup (data));
486 #ifndef GST_DISABLE_OPTION_PARSING
488 prepare_for_load_plugin_func (gpointer data, gpointer user_data)
490 preload_plugins = g_slist_prepend (preload_plugins, g_strdup (data));
495 load_plugin_func (gpointer data, gpointer user_data)
498 const gchar *filename;
501 filename = (const gchar *) data;
503 plugin = gst_plugin_load_file (filename, &err);
506 GST_INFO ("Loaded plugin: \"%s\"", filename);
508 gst_default_registry_add_plugin (plugin);
511 /* Report error to user, and free error */
512 GST_ERROR ("Failed to load plugin: %s", err->message);
515 GST_WARNING ("Failed to load plugin: \"%s\"", filename);
520 #ifndef GST_DISABLE_OPTION_PARSING
522 split_and_iterate (const gchar * stringlist, gchar * separator, GFunc iterator,
527 gchar *lastlist = g_strdup (stringlist);
530 strings = g_strsplit (lastlist, separator, MAX_PATH_SPLIT);
535 iterator (strings[j], user_data);
536 if (++j == MAX_PATH_SPLIT) {
537 lastlist = g_strdup (strings[j]);
542 g_strfreev (strings);
547 /* we have no fail cases yet, but maybe in the future */
549 init_pre (GOptionContext * context, GOptionGroup * group, gpointer data,
552 if (gst_initialized) {
553 GST_DEBUG ("already initialized");
557 /* GStreamer was built against a GLib >= 2.8 and is therefore not doing
558 * the refcount hack. Check that it isn't being run against an older GLib */
559 if (glib_major_version < 2 ||
560 (glib_major_version == 2 && glib_minor_version < 8)) {
561 g_warning ("GStreamer was compiled against GLib %d.%d.%d but is running"
562 " against %d.%d.%d. This will cause reference counting issues",
563 GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, GLIB_MICRO_VERSION,
564 glib_major_version, glib_minor_version, glib_micro_version);
569 /* we need threading to be enabled right here */
570 g_assert (g_thread_supported ());
574 setlocale (LC_ALL, "");
575 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
576 #endif /* ENABLE_NLS */
578 #ifndef GST_DISABLE_GST_DEBUG
580 const gchar *debug_list;
582 if (g_getenv ("GST_DEBUG_NO_COLOR") != NULL)
583 gst_debug_set_colored (FALSE);
585 debug_list = g_getenv ("GST_DEBUG");
587 parse_debug_list (debug_list);
591 priv_gst_dump_dot_dir = g_getenv ("GST_DEBUG_DUMP_DOT_DIR");
593 /* This is the earliest we can make stuff show up in the logs.
594 * So give some useful info about GStreamer here */
595 GST_INFO ("Initializing GStreamer Core Library version %s", VERSION);
596 GST_INFO ("Using library installed in %s", LIBDIR);
598 /* Print some basic system details if possible (OS/architecture) */
599 #ifdef HAVE_SYS_UTSNAME_H
601 struct utsname sys_details;
603 if (uname (&sys_details) == 0) {
604 GST_INFO ("%s %s %s %s %s", sys_details.sysname,
605 sys_details.nodename, sys_details.release, sys_details.version,
606 sys_details.machine);
615 gst_register_core_elements (GstPlugin * plugin)
617 /* register some standard builtin types */
618 if (!gst_element_register (plugin, "bin", GST_RANK_PRIMARY,
620 !gst_element_register (plugin, "pipeline", GST_RANK_PRIMARY,
623 g_assert_not_reached ();
628 static GstPluginDesc plugin_desc = {
632 "core elements linked into the GStreamer library",
633 gst_register_core_elements,
643 #ifndef GST_DISABLE_REGISTRY
647 REGISTRY_SCAN_AND_UPDATE_FAILURE = 0,
648 REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED,
649 REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED
650 } GstRegistryScanAndUpdateResult;
653 * scan_and_update_registry:
654 * @default_registry: the #GstRegistry
655 * @registry_file: registry filename
656 * @write_changes: write registry if it has changed?
658 * Scans for registry changes and eventually updates the registry cache.
660 * Return: %REGISTRY_SCAN_AND_UPDATE_FAILURE if the registry could not scanned
661 * or updated, %REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED if the
662 * registry is clean and %REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED if
663 * it has been updated and the cache needs to be re-read.
665 static GstRegistryScanAndUpdateResult
666 scan_and_update_registry (GstRegistry * default_registry,
667 const gchar * registry_file, gboolean write_changes, GError ** error)
669 const gchar *plugin_path;
670 gboolean changed = FALSE;
673 /* scan paths specified via --gst-plugin-path */
674 GST_DEBUG ("scanning paths added via --gst-plugin-path");
675 for (l = plugin_paths; l != NULL; l = l->next) {
676 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
677 /* CHECKME: add changed |= here as well? */
678 gst_registry_scan_path (default_registry, (gchar *) l->data);
680 /* keep plugin_paths around in case a re-scan is forced later on */
682 /* GST_PLUGIN_PATH specifies a list of directories to scan for
683 * additional plugins. These take precedence over the system plugins */
684 plugin_path = g_getenv ("GST_PLUGIN_PATH");
689 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
690 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
691 for (i = 0; list[i]; i++) {
692 changed |= gst_registry_scan_path (default_registry, list[i]);
696 GST_DEBUG ("GST_PLUGIN_PATH not set");
699 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
700 * loaded by default. If not set, this defaults to the system-installed
701 * path, and the plugins installed in the user's home directory */
702 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
703 if (plugin_path == NULL) {
706 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
708 /* plugins in the user's home directory take precedence over
709 * system-installed ones */
710 home_plugins = g_build_filename (g_get_home_dir (),
711 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
712 GST_DEBUG ("scanning home plugins %s", home_plugins);
713 changed |= gst_registry_scan_path (default_registry, home_plugins);
714 g_free (home_plugins);
716 /* add the main (installed) library path */
717 GST_DEBUG ("scanning main plugins %s", PLUGINDIR);
718 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
723 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
724 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
725 for (i = 0; list[i]; i++) {
726 changed |= gst_registry_scan_path (default_registry, list[i]);
731 /* Remove cached plugins so stale info is cleared. */
732 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
735 GST_INFO ("Registry cache has not changed");
736 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED;
739 if (!write_changes) {
740 GST_INFO ("Registry cached changed, but writing is disabled. Not writing.");
741 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
744 GST_INFO ("Registry cache changed. Writing new registry cache");
745 #ifdef USE_BINARY_REGISTRY
746 if (!gst_registry_binary_write_cache (default_registry, registry_file)) {
748 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
750 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
751 _("Error writing registry cache to %s: %s"),
752 registry_file, g_strerror (errno));
753 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
756 GST_INFO ("Registry cache written successfully");
757 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED;
761 ensure_current_registry_nonforking (GstRegistry * default_registry,
762 const gchar * registry_file, GError ** error)
764 /* fork() not available */
765 GST_INFO ("reading registry cache: %s", registry_file);
766 #ifdef USE_BINARY_REGISTRY
767 gst_registry_binary_read_cache (default_registry, registry_file);
769 gst_registry_xml_read_cache (default_registry, registry_file);
771 GST_DEBUG ("Updating registry cache in-process");
772 scan_and_update_registry (default_registry, registry_file, TRUE, error);
776 /* when forking is not available this function always does nothing but return
779 ensure_current_registry_forking (GstRegistry * default_registry,
780 const gchar * registry_file, GError ** error)
787 /* We fork here, and let the child read and possibly rebuild the registry.
788 * After that, the parent will re-read the freshly generated registry. */
789 GST_DEBUG ("forking to update registry");
791 if (pipe (pfd) == -1) {
792 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
793 _("Error re-scanning registry %s: %s"),
794 ", could not create pipes. Error", g_strerror (errno));
798 GST_INFO ("reading registry cache: %s", registry_file);
799 #ifdef USE_BINARY_REGISTRY
800 gst_registry_binary_read_cache (default_registry, registry_file);
802 gst_registry_xml_read_cache (default_registry, registry_file);
807 GST_ERROR ("Failed to fork()");
808 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
809 _("Error re-scanning registry %s: %s"),
810 ", failed to fork. Error", g_strerror (errno));
817 /* this is the child. Close the read pipe */
818 (void) close (pfd[0]);
820 GST_DEBUG ("child reading registry cache");
822 scan_and_update_registry (default_registry, registry_file, TRUE, NULL);
824 /* need to use _exit, so that any exit handlers registered don't
825 * bring down the main program */
826 GST_DEBUG ("child exiting: %d", result_code);
828 /* make valgrind happy (yes, you can call it insane) */
829 g_free ((char *) registry_file);
831 /* write a result byte to the pipe */
833 ret = write (pfd[1], &result_code, sizeof (result_code));
834 } while (ret == -1 && errno == EINTR);
835 /* if ret == -1 now, we could not write to pipe, probably
836 * means parent has exited before us */
837 (void) close (pfd[1]);
843 /* parent. Close write pipe */
844 (void) close (pfd[1]);
846 /* Wait for result from the pipe */
847 GST_DEBUG ("Waiting for data from child");
849 ret = read (pfd[0], &result_code, sizeof (result_code));
850 } while (ret == -1 && errno == EINTR);
853 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
854 _("Error re-scanning registry %s: %s"),
855 ", read returned error", g_strerror (errno));
859 (void) close (pfd[0]);
861 /* Wait to ensure the child is reaped, but ignore the result */
862 GST_DEBUG ("parent waiting on child");
863 waitpid (pid, NULL, 0);
864 GST_DEBUG ("parent done waiting on child");
867 GST_ERROR ("child did not exit normally, terminated by signal");
868 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
869 _("Error re-scanning registry %s"), ", child terminated by signal");
873 if (result_code == REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED) {
874 GST_DEBUG ("Child succeeded. Parent reading registry cache");
875 _priv_gst_registry_remove_cache_plugins (default_registry);
876 #ifdef USE_BINARY_REGISTRY
877 gst_registry_binary_read_cache (default_registry, registry_file);
879 gst_registry_xml_read_cache (default_registry, registry_file);
881 } else if (result_code == REGISTRY_SCAN_AND_UPDATE_FAILURE) {
882 GST_DEBUG ("Child failed. Parent re-scanning registry, ignoring errors.");
883 scan_and_update_registry (default_registry, registry_file, FALSE, NULL);
886 #endif /* HAVE_FORK */
891 ensure_current_registry (GError ** error)
894 GstRegistry *default_registry;
898 default_registry = gst_registry_get_default ();
899 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
900 if (registry_file == NULL) {
901 #ifdef USE_BINARY_REGISTRY
902 registry_file = g_build_filename (g_get_home_dir (),
903 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".bin", NULL);
905 registry_file = g_build_filename (g_get_home_dir (),
906 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
910 /* first see if forking is enabled */
911 do_fork = _gst_enable_registry_fork;
913 const gchar *fork_env;
915 /* forking enabled, see if it is disabled with an env var */
916 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
917 /* fork enabled for any value different from "no" */
918 do_fork = strcmp (fork_env, "no") != 0;
922 /* now check registry with or without forking */
924 GST_DEBUG ("forking for registry rebuild");
925 ret = ensure_current_registry_forking (default_registry, registry_file,
928 GST_DEBUG ("requested not to fork for registry rebuild");
929 ret = ensure_current_registry_nonforking (default_registry, registry_file,
933 g_free (registry_file);
937 #endif /* GST_DISABLE_REGISTRY */
941 * - initalization of threads if we use them
944 * - initializes gst_format
945 * - registers a bunch of types for gst_objects
947 * - we don't have cases yet where this fails, but in the future
948 * we might and then it's nice to be able to return that
951 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
956 #ifndef GST_DISABLE_TRACE
958 #endif /* GST_DISABLE_TRACE */
960 if (gst_initialized) {
961 GST_DEBUG ("already initialized");
965 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
966 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
968 _priv_gst_quarks_initialize ();
969 _gst_format_initialize ();
970 _gst_query_initialize ();
971 g_type_class_ref (gst_object_get_type ());
972 g_type_class_ref (gst_pad_get_type ());
973 g_type_class_ref (gst_element_factory_get_type ());
974 g_type_class_ref (gst_element_get_type ());
975 g_type_class_ref (gst_type_find_factory_get_type ());
976 g_type_class_ref (gst_bin_get_type ());
978 #ifndef GST_DISABLE_INDEX
979 g_type_class_ref (gst_index_factory_get_type ());
980 #endif /* GST_DISABLE_INDEX */
981 #ifndef GST_DISABLE_URI
982 gst_uri_handler_get_type ();
983 #endif /* GST_DISABLE_URI */
985 gst_structure_get_type ();
986 _gst_value_initialize ();
987 g_type_class_ref (gst_param_spec_fraction_get_type ());
988 gst_caps_get_type ();
989 _gst_event_initialize ();
990 _gst_buffer_initialize ();
991 _gst_message_initialize ();
992 _gst_tag_initialize ();
994 _gst_plugin_initialize ();
996 /* register core plugins */
997 gst_plugin_register_static (&plugin_desc);
1000 * Any errors happening below this point are non-fatal, we therefore mark
1001 * gstreamer as being initialized, since it is the case from a plugin point of
1004 * If anything fails, it will be put back to FALSE in gst_init_check().
1005 * This allows some special plugins that would call gst_init() to not cause a
1006 * looping effect (i.e. initializing GStreamer twice).
1008 gst_initialized = TRUE;
1010 #ifndef GST_DISABLE_REGISTRY
1011 if (!ensure_current_registry (error))
1013 #endif /* GST_DISABLE_REGISTRY */
1015 /* if we need to preload plugins, do so now */
1016 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1017 /* keep preload_plugins around in case a re-scan is forced later on */
1019 #ifndef GST_DISABLE_TRACE
1021 if (_gst_trace_on) {
1022 gst_trace = gst_trace_new ("gst.trace", 1024);
1023 gst_trace_set_default (gst_trace);
1025 #endif /* GST_DISABLE_TRACE */
1030 #ifndef GST_DISABLE_GST_DEBUG
1032 select_all (GstPlugin * plugin, gpointer user_data)
1038 sort_by_category_name (gconstpointer a, gconstpointer b)
1040 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
1041 gst_debug_category_get_name ((GstDebugCategory *) b));
1045 gst_debug_help (void)
1047 GSList *list, *walk;
1050 /* Need to ensure the registry is loaded to get debug categories */
1051 if (!init_post (NULL, NULL, NULL, NULL))
1054 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
1055 select_all, FALSE, NULL);
1057 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
1058 for (g = list2; g; g = g_list_next (g)) {
1059 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
1061 gst_plugin_load (plugin);
1063 g_list_free (list2);
1065 list = gst_debug_get_all_categories ();
1066 walk = list = g_slist_sort (list, sort_by_category_name);
1069 g_print ("name level description\n");
1070 g_print ("---------------------+--------+--------------------------------\n");
1073 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
1075 if (gst_debug_is_colored ()) {
1076 gchar *color = gst_debug_construct_term_color (cat->color);
1078 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
1080 gst_debug_category_get_name (cat),
1081 gst_debug_category_get_threshold (cat),
1082 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1083 color, gst_debug_category_get_description (cat));
1086 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
1087 gst_debug_category_get_threshold (cat),
1088 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1089 gst_debug_category_get_description (cat));
1091 walk = g_slist_next (walk);
1093 g_slist_free (list);
1098 #ifndef GST_DISABLE_OPTION_PARSING
1100 parse_one_option (gint opt, const gchar * arg, GError ** err)
1104 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
1106 case ARG_FATAL_WARNINGS:{
1107 GLogLevelFlags fatal_mask;
1109 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1110 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1111 g_log_set_always_fatal (fatal_mask);
1114 #ifndef GST_DISABLE_GST_DEBUG
1115 case ARG_DEBUG_LEVEL:{
1118 tmp = strtol (arg, NULL, 0);
1119 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1120 gst_debug_set_default_threshold (tmp);
1125 parse_debug_list (arg);
1127 case ARG_DEBUG_NO_COLOR:
1128 gst_debug_set_colored (FALSE);
1130 case ARG_DEBUG_DISABLE:
1131 gst_debug_set_active (FALSE);
1133 case ARG_DEBUG_HELP:
1137 case ARG_PLUGIN_SPEW:
1139 case ARG_PLUGIN_PATH:
1140 #ifndef GST_DISABLE_REGISTRY
1141 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1142 #endif /* GST_DISABLE_REGISTRY */
1144 case ARG_PLUGIN_LOAD:
1145 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1147 case ARG_SEGTRAP_DISABLE:
1148 _gst_disable_segtrap = TRUE;
1150 case ARG_REGISTRY_FORK_DISABLE:
1151 _gst_enable_registry_fork = FALSE;
1154 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1155 _("Unknown option"));
1163 parse_goption_arg (const gchar * opt,
1164 const gchar * arg, gpointer data, GError ** err)
1172 "--gst-version", ARG_VERSION}, {
1173 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1174 #ifndef GST_DISABLE_GST_DEBUG
1176 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1177 "--gst-debug", ARG_DEBUG}, {
1178 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1179 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1180 "--gst-debug-help", ARG_DEBUG_HELP},
1183 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1184 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1185 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1186 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1187 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1192 for (n = 0; options[n].opt; n++) {
1193 if (!strcmp (opt, options[n].opt)) {
1194 val = options[n].val;
1199 return parse_one_option (val, arg, err);
1203 extern GstRegistry *_gst_registry_default;
1208 * Clean up any resources created by GStreamer in gst_init().
1210 * It is normally not needed to call this function in a normal application
1211 * as the resources will automatically be freed when the program terminates.
1212 * This function is therefore mostly used by testsuites and other memory
1215 * After this call GStreamer (including this method) should not be used anymore.
1222 GST_INFO ("deinitializing GStreamer");
1224 if (!gst_initialized) {
1225 GST_DEBUG ("already deinitialized");
1229 g_slist_foreach (preload_plugins, (GFunc) g_free, NULL);
1230 g_slist_free (preload_plugins);
1231 preload_plugins = NULL;
1233 #ifndef GST_DISABLE_REGISTRY
1234 g_list_foreach (plugin_paths, (GFunc) g_free, NULL);
1235 g_list_free (plugin_paths);
1236 plugin_paths = NULL;
1239 clock = gst_system_clock_obtain ();
1240 gst_object_unref (clock);
1241 gst_object_unref (clock);
1243 _priv_gst_registry_cleanup ();
1245 g_type_class_unref (g_type_class_peek (gst_object_get_type ()));
1246 g_type_class_unref (g_type_class_peek (gst_pad_get_type ()));
1247 g_type_class_unref (g_type_class_peek (gst_element_factory_get_type ()));
1248 g_type_class_unref (g_type_class_peek (gst_element_get_type ()));
1249 g_type_class_unref (g_type_class_peek (gst_type_find_factory_get_type ()));
1250 g_type_class_unref (g_type_class_peek (gst_bin_get_type ()));
1251 #ifndef GST_DISABLE_INDEX
1252 g_type_class_unref (g_type_class_peek (gst_index_factory_get_type ()));
1253 #endif /* GST_DISABLE_INDEX */
1254 g_type_class_unref (g_type_class_peek (gst_param_spec_fraction_get_type ()));
1256 gst_initialized = FALSE;
1257 GST_INFO ("deinitialized GStreamer");
1262 * @major: pointer to a guint to store the major version number
1263 * @minor: pointer to a guint to store the minor version number
1264 * @micro: pointer to a guint to store the micro version number
1265 * @nano: pointer to a guint to store the nano version number
1267 * Gets the version number of the GStreamer library.
1270 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1272 g_return_if_fail (major);
1273 g_return_if_fail (minor);
1274 g_return_if_fail (micro);
1275 g_return_if_fail (nano);
1277 *major = GST_VERSION_MAJOR;
1278 *minor = GST_VERSION_MINOR;
1279 *micro = GST_VERSION_MICRO;
1280 *nano = GST_VERSION_NANO;
1284 * gst_version_string:
1286 * This function returns a string that is useful for describing this version
1287 * of GStreamer to the outside world: user agent strings, logging, ...
1289 * Returns: a newly allocated string describing this version of GStreamer.
1293 gst_version_string ()
1295 guint major, minor, micro, nano;
1297 gst_version (&major, &minor, µ, &nano);
1299 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1301 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1303 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1308 * gst_segtrap_is_enabled:
1310 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1311 * to better catch and report errors to the application. Currently this feature
1312 * is enabled by default when loading plugins.
1314 * Applications might want to disable this behaviour with the
1315 * gst_segtrap_set_enabled() function. This is typically done if the application
1316 * wants to install its own handler without GStreamer interfering.
1318 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1323 gst_segtrap_is_enabled (void)
1325 /* yeps, it's enabled when it's not disabled */
1326 return !_gst_disable_segtrap;
1330 * gst_segtrap_set_enabled:
1331 * @enabled: whether a custom SIGSEGV handler should be installed.
1333 * Applications might want to disable/enable the SIGSEGV handling of
1334 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1339 gst_segtrap_set_enabled (gboolean enabled)
1341 _gst_disable_segtrap = !enabled;
1345 * gst_registry_fork_is_enabled:
1347 * By default GStreamer will perform a fork() when scanning and rebuilding the
1350 * Applications might want to disable this behaviour with the
1351 * gst_registry_fork_set_enabled() function.
1353 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1354 * platforms without fork(), this function will always return %FALSE.
1359 gst_registry_fork_is_enabled (void)
1361 return _gst_enable_registry_fork;
1365 * gst_registry_fork_set_enabled:
1366 * @enabled: whether rebuilding the registry may fork
1368 * Applications might want to disable/enable the usage of fork() when rebuilding
1369 * the registry. See gst_registry_fork_is_enabled() for more information.
1371 * On platforms without fork(), this function will have no effect on the return
1372 * value of gst_registry_fork_is_enabled().
1377 gst_registry_fork_set_enabled (gboolean enabled)
1380 _gst_enable_registry_fork = enabled;
1381 #endif /* HAVE_FORK */
1386 * gst_update_registry:
1388 * Forces GStreamer to re-scan its plugin paths and update the default
1391 * Applications will almost never need to call this function, it is only
1392 * useful if the application knows new plugins have been installed (or old
1393 * ones removed) since the start of the application (or, to be precise, the
1394 * first call to gst_init()) and the application wants to make use of any
1395 * newly-installed plugins without restarting the application.
1397 * Applications should assume that the registry update is neither atomic nor
1398 * thread-safe and should therefore not have any dynamic pipelines running
1399 * (including the playbin and decodebin elements) and should also not create
1400 * any elements or access the GStreamer registry while the update is in
1403 * Note that this function may block for a significant amount of time.
1405 * Returns: %TRUE if the registry has been updated successfully (does not
1406 * imply that there were changes), otherwise %FALSE.
1411 gst_update_registry (void)
1413 gboolean res = FALSE;
1415 #ifndef GST_DISABLE_REGISTRY
1418 res = ensure_current_registry (&err);
1420 GST_WARNING ("registry update failed: %s", err->message);
1423 GST_LOG ("registry update succeeded");
1426 if (preload_plugins) {
1427 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1430 GST_WARNING ("registry update failed: %s", "registry disabled");
1431 #endif /* GST_DISABLE_REGISTRY */