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;
137 extern gboolean _gst_debug_dump_dot_files_on;
141 #define DEFAULT_FORK TRUE
143 #define DEFAULT_FORK FALSE
144 #endif /* HAVE_FORK */
146 /* set to TRUE when segfaults need to be left as is, FIXME, this variable is
148 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);
590 if (g_getenv ("GST_DEBUG_DUMP_DOT_FILES") != NULL)
591 _gst_debug_dump_dot_files_on = TRUE;
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 static GstPluginDesc plugin_desc = {
633 "core elements linked into the GStreamer library",
634 gst_register_core_elements,
644 #ifndef GST_DISABLE_REGISTRY
648 REGISTRY_SCAN_AND_UPDATE_FAILURE = 0,
649 REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED,
650 REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED
651 } GstRegistryScanAndUpdateResult;
654 * scan_and_update_registry:
655 * @default_registry: the #GstRegistry
656 * @registry_file: registry filename
657 * @write_changes: write registry if it has changed?
659 * Scans for registry changes and eventually updates the registry cache.
661 * Return: %REGISTRY_SCAN_AND_UPDATE_FAILURE if the registry could not scanned
662 * or updated, %REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED if the
663 * registry is clean and %REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED if
664 * it has been updated and the cache needs to be re-read.
666 static GstRegistryScanAndUpdateResult
667 scan_and_update_registry (GstRegistry * default_registry,
668 const gchar * registry_file, gboolean write_changes, GError ** error)
670 const gchar *plugin_path;
671 gboolean changed = FALSE;
674 /* scan paths specified via --gst-plugin-path */
675 GST_DEBUG ("scanning paths added via --gst-plugin-path");
676 for (l = plugin_paths; l != NULL; l = l->next) {
677 GST_INFO ("Scanning plugin path: \"%s\"", (gchar *) l->data);
678 /* CHECKME: add changed |= here as well? */
679 gst_registry_scan_path (default_registry, (gchar *) l->data);
681 /* keep plugin_paths around in case a re-scan is forced later on */
683 /* GST_PLUGIN_PATH specifies a list of directories to scan for
684 * additional plugins. These take precedence over the system plugins */
685 plugin_path = g_getenv ("GST_PLUGIN_PATH");
690 GST_DEBUG ("GST_PLUGIN_PATH set to %s", plugin_path);
691 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
692 for (i = 0; list[i]; i++) {
693 changed |= gst_registry_scan_path (default_registry, list[i]);
697 GST_DEBUG ("GST_PLUGIN_PATH not set");
700 /* GST_PLUGIN_SYSTEM_PATH specifies a list of plugins that are always
701 * loaded by default. If not set, this defaults to the system-installed
702 * path, and the plugins installed in the user's home directory */
703 plugin_path = g_getenv ("GST_PLUGIN_SYSTEM_PATH");
704 if (plugin_path == NULL) {
707 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH not set");
709 /* plugins in the user's home directory take precedence over
710 * system-installed ones */
711 home_plugins = g_build_filename (g_get_home_dir (),
712 ".gstreamer-" GST_MAJORMINOR, "plugins", NULL);
713 GST_DEBUG ("scanning home plugins %s", home_plugins);
714 changed |= gst_registry_scan_path (default_registry, home_plugins);
715 g_free (home_plugins);
717 /* add the main (installed) library path */
718 GST_DEBUG ("scanning main plugins %s", PLUGINDIR);
719 changed |= gst_registry_scan_path (default_registry, PLUGINDIR);
724 GST_DEBUG ("GST_PLUGIN_SYSTEM_PATH set to %s", plugin_path);
725 list = g_strsplit (plugin_path, G_SEARCHPATH_SEPARATOR_S, 0);
726 for (i = 0; list[i]; i++) {
727 changed |= gst_registry_scan_path (default_registry, list[i]);
732 /* Remove cached plugins so stale info is cleared. */
733 changed |= _priv_gst_registry_remove_cache_plugins (default_registry);
736 GST_INFO ("Registry cache has not changed");
737 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_NOT_CHANGED;
740 if (!write_changes) {
741 GST_INFO ("Registry cached changed, but writing is disabled. Not writing.");
742 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
745 GST_INFO ("Registry cache changed. Writing new registry cache");
746 #ifdef USE_BINARY_REGISTRY
747 if (!gst_registry_binary_write_cache (default_registry, registry_file)) {
749 if (!gst_registry_xml_write_cache (default_registry, registry_file)) {
751 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
752 _("Error writing registry cache to %s: %s"),
753 registry_file, g_strerror (errno));
754 return REGISTRY_SCAN_AND_UPDATE_FAILURE;
757 GST_INFO ("Registry cache written successfully");
758 return REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED;
762 ensure_current_registry_nonforking (GstRegistry * default_registry,
763 const gchar * registry_file, GError ** error)
765 /* fork() not available */
766 GST_INFO ("reading registry cache: %s", registry_file);
767 #ifdef USE_BINARY_REGISTRY
768 gst_registry_binary_read_cache (default_registry, registry_file);
770 gst_registry_xml_read_cache (default_registry, registry_file);
772 GST_DEBUG ("Updating registry cache in-process");
773 scan_and_update_registry (default_registry, registry_file, TRUE, error);
777 /* when forking is not available this function always does nothing but return
780 ensure_current_registry_forking (GstRegistry * default_registry,
781 const gchar * registry_file, GError ** error)
788 /* We fork here, and let the child read and possibly rebuild the registry.
789 * After that, the parent will re-read the freshly generated registry. */
790 GST_DEBUG ("forking to update registry");
792 if (pipe (pfd) == -1) {
793 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
794 _("Error re-scanning registry %s: %s"),
795 ", could not create pipes. Error", g_strerror (errno));
799 GST_INFO ("reading registry cache: %s", registry_file);
800 #ifdef USE_BINARY_REGISTRY
801 gst_registry_binary_read_cache (default_registry, registry_file);
803 gst_registry_xml_read_cache (default_registry, registry_file);
808 GST_ERROR ("Failed to fork()");
809 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
810 _("Error re-scanning registry %s: %s"),
811 ", failed to fork. Error", g_strerror (errno));
818 /* this is the child. Close the read pipe */
819 (void) close (pfd[0]);
821 GST_DEBUG ("child reading registry cache");
823 scan_and_update_registry (default_registry, registry_file, TRUE, NULL);
825 /* need to use _exit, so that any exit handlers registered don't
826 * bring down the main program */
827 GST_DEBUG ("child exiting: %d", result_code);
829 /* make valgrind happy (yes, you can call it insane) */
830 g_free ((char *) registry_file);
832 /* write a result byte to the pipe */
834 ret = write (pfd[1], &result_code, sizeof (result_code));
835 } while (ret == -1 && errno == EINTR);
836 /* if ret == -1 now, we could not write to pipe, probably
837 * means parent has exited before us */
838 (void) close (pfd[1]);
844 /* parent. Close write pipe */
845 (void) close (pfd[1]);
847 /* Wait for result from the pipe */
848 GST_DEBUG ("Waiting for data from child");
850 ret = read (pfd[0], &result_code, sizeof (result_code));
851 } while (ret == -1 && errno == EINTR);
854 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
855 _("Error re-scanning registry %s: %s"),
856 ", read returned error", g_strerror (errno));
860 (void) close (pfd[0]);
862 /* Wait to ensure the child is reaped, but ignore the result */
863 GST_DEBUG ("parent waiting on child");
864 waitpid (pid, NULL, 0);
865 GST_DEBUG ("parent done waiting on child");
868 GST_ERROR ("child did not exit normally, terminated by signal");
869 g_set_error (error, GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
870 _("Error re-scanning registry %s"), ", child terminated by signal");
874 if (result_code == REGISTRY_SCAN_AND_UPDATE_SUCCESS_UPDATED) {
875 GST_DEBUG ("Child succeeded. Parent reading registry cache");
876 _priv_gst_registry_remove_cache_plugins (default_registry);
877 #ifdef USE_BINARY_REGISTRY
878 gst_registry_binary_read_cache (default_registry, registry_file);
880 gst_registry_xml_read_cache (default_registry, registry_file);
882 } else if (result_code == REGISTRY_SCAN_AND_UPDATE_FAILURE) {
883 GST_DEBUG ("Child failed. Parent re-scanning registry, ignoring errors.");
884 scan_and_update_registry (default_registry, registry_file, FALSE, NULL);
887 #endif /* HAVE_FORK */
892 ensure_current_registry (GError ** error)
895 GstRegistry *default_registry;
899 default_registry = gst_registry_get_default ();
900 registry_file = g_strdup (g_getenv ("GST_REGISTRY"));
901 if (registry_file == NULL) {
902 #ifdef USE_BINARY_REGISTRY
903 registry_file = g_build_filename (g_get_home_dir (),
904 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".bin", NULL);
906 registry_file = g_build_filename (g_get_home_dir (),
907 ".gstreamer-" GST_MAJORMINOR, "registry." HOST_CPU ".xml", NULL);
911 /* first see if forking is enabled */
912 do_fork = _gst_enable_registry_fork;
914 const gchar *fork_env;
916 /* forking enabled, see if it is disabled with an env var */
917 if ((fork_env = g_getenv ("GST_REGISTRY_FORK"))) {
918 /* fork enabled for any value different from "no" */
919 do_fork = strcmp (fork_env, "no") != 0;
923 /* now check registry with or without forking */
925 GST_DEBUG ("forking for registry rebuild");
926 ret = ensure_current_registry_forking (default_registry, registry_file,
929 GST_DEBUG ("requested not to fork for registry rebuild");
930 ret = ensure_current_registry_nonforking (default_registry, registry_file,
934 g_free (registry_file);
938 #endif /* GST_DISABLE_REGISTRY */
942 * - initalization of threads if we use them
945 * - initializes gst_format
946 * - registers a bunch of types for gst_objects
948 * - we don't have cases yet where this fails, but in the future
949 * we might and then it's nice to be able to return that
952 init_post (GOptionContext * context, GOptionGroup * group, gpointer data,
957 #ifndef GST_DISABLE_TRACE
959 #endif /* GST_DISABLE_TRACE */
961 if (gst_initialized) {
962 GST_DEBUG ("already initialized");
966 llf = G_LOG_LEVEL_CRITICAL | G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL;
967 g_log_set_handler (g_log_domain_gstreamer, llf, debug_log_handler, NULL);
969 _priv_gst_quarks_initialize ();
970 _gst_format_initialize ();
971 _gst_query_initialize ();
972 gst_object_get_type ();
974 gst_element_factory_get_type ();
975 gst_element_get_type ();
976 gst_type_find_factory_get_type ();
979 #ifndef GST_DISABLE_INDEX
980 gst_index_factory_get_type ();
981 #endif /* GST_DISABLE_INDEX */
982 #ifndef GST_DISABLE_URI
983 gst_uri_handler_get_type ();
984 #endif /* GST_DISABLE_URI */
986 gst_structure_get_type ();
987 _gst_value_initialize ();
988 gst_param_spec_fraction_get_type ();
989 gst_caps_get_type ();
990 _gst_event_initialize ();
991 _gst_buffer_initialize ();
992 _gst_message_initialize ();
993 _gst_tag_initialize ();
995 /* register core plugins */
996 _gst_plugin_register_static (&plugin_desc);
998 _gst_plugin_initialize ();
1001 * Any errors happening below this point are non-fatal, we therefore mark
1002 * gstreamer as being initialized, since it is the case from a plugin point of
1005 * If anything fails, it will be put back to FALSE in gst_init_check().
1006 * This allows some special plugins that would call gst_init() to not cause a
1007 * looping effect (i.e. initializing GStreamer twice).
1009 gst_initialized = TRUE;
1011 #ifndef GST_DISABLE_REGISTRY
1012 if (!ensure_current_registry (error))
1014 #endif /* GST_DISABLE_REGISTRY */
1016 /* if we need to preload plugins, do so now */
1017 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1018 /* keep preload_plugins around in case a re-scan is forced later on */
1020 #ifndef GST_DISABLE_TRACE
1022 if (_gst_trace_on) {
1023 gst_trace = gst_trace_new ("gst.trace", 1024);
1024 gst_trace_set_default (gst_trace);
1026 #endif /* GST_DISABLE_TRACE */
1031 #ifndef GST_DISABLE_GST_DEBUG
1033 select_all (GstPlugin * plugin, gpointer user_data)
1039 sort_by_category_name (gconstpointer a, gconstpointer b)
1041 return strcmp (gst_debug_category_get_name ((GstDebugCategory *) a),
1042 gst_debug_category_get_name ((GstDebugCategory *) b));
1046 gst_debug_help (void)
1048 GSList *list, *walk;
1051 /* Need to ensure the registry is loaded to get debug categories */
1052 if (!init_post (NULL, NULL, NULL, NULL))
1055 list2 = gst_registry_plugin_filter (gst_registry_get_default (),
1056 select_all, FALSE, NULL);
1058 /* FIXME this is gross. why don't debug have categories PluginFeatures? */
1059 for (g = list2; g; g = g_list_next (g)) {
1060 GstPlugin *plugin = GST_PLUGIN_CAST (g->data);
1062 gst_plugin_load (plugin);
1064 g_list_free (list2);
1066 list = gst_debug_get_all_categories ();
1067 walk = list = g_slist_sort (list, sort_by_category_name);
1070 g_print ("name level description\n");
1071 g_print ("---------------------+--------+--------------------------------\n");
1074 GstDebugCategory *cat = (GstDebugCategory *) walk->data;
1076 if (gst_debug_is_colored ()) {
1077 gchar *color = gst_debug_construct_term_color (cat->color);
1079 g_print ("%s%-20s\033[00m %1d %s %s%s\033[00m\n",
1081 gst_debug_category_get_name (cat),
1082 gst_debug_category_get_threshold (cat),
1083 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1084 color, gst_debug_category_get_description (cat));
1087 g_print ("%-20s %1d %s %s\n", gst_debug_category_get_name (cat),
1088 gst_debug_category_get_threshold (cat),
1089 gst_debug_level_get_name (gst_debug_category_get_threshold (cat)),
1090 gst_debug_category_get_description (cat));
1092 walk = g_slist_next (walk);
1094 g_slist_free (list);
1099 #ifndef GST_DISABLE_OPTION_PARSING
1101 parse_one_option (gint opt, const gchar * arg, GError ** err)
1105 g_print ("GStreamer Core Library version %s\n", PACKAGE_VERSION);
1107 case ARG_FATAL_WARNINGS:{
1108 GLogLevelFlags fatal_mask;
1110 fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
1111 fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
1112 g_log_set_always_fatal (fatal_mask);
1115 #ifndef GST_DISABLE_GST_DEBUG
1116 case ARG_DEBUG_LEVEL:{
1119 tmp = strtol (arg, NULL, 0);
1120 if (tmp >= 0 && tmp < GST_LEVEL_COUNT) {
1121 gst_debug_set_default_threshold (tmp);
1126 parse_debug_list (arg);
1128 case ARG_DEBUG_NO_COLOR:
1129 gst_debug_set_colored (FALSE);
1131 case ARG_DEBUG_DISABLE:
1132 gst_debug_set_active (FALSE);
1134 case ARG_DEBUG_HELP:
1138 case ARG_PLUGIN_SPEW:
1140 case ARG_PLUGIN_PATH:
1141 #ifndef GST_DISABLE_REGISTRY
1142 split_and_iterate (arg, G_SEARCHPATH_SEPARATOR_S, add_path_func, NULL);
1143 #endif /* GST_DISABLE_REGISTRY */
1145 case ARG_PLUGIN_LOAD:
1146 split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
1148 case ARG_SEGTRAP_DISABLE:
1149 _gst_disable_segtrap = TRUE;
1151 case ARG_REGISTRY_FORK_DISABLE:
1152 _gst_enable_registry_fork = FALSE;
1155 g_set_error (err, G_OPTION_ERROR, G_OPTION_ERROR_UNKNOWN_OPTION,
1156 _("Unknown option"));
1164 parse_goption_arg (const gchar * opt,
1165 const gchar * arg, gpointer data, GError ** err)
1173 "--gst-version", ARG_VERSION}, {
1174 "--gst-fatal-warnings", ARG_FATAL_WARNINGS},
1175 #ifndef GST_DISABLE_GST_DEBUG
1177 "--gst-debug-level", ARG_DEBUG_LEVEL}, {
1178 "--gst-debug", ARG_DEBUG}, {
1179 "--gst-debug-disable", ARG_DEBUG_DISABLE}, {
1180 "--gst-debug-no-color", ARG_DEBUG_NO_COLOR}, {
1181 "--gst-debug-help", ARG_DEBUG_HELP},
1184 "--gst-plugin-spew", ARG_PLUGIN_SPEW}, {
1185 "--gst-plugin-path", ARG_PLUGIN_PATH}, {
1186 "--gst-plugin-load", ARG_PLUGIN_LOAD}, {
1187 "--gst-disable-segtrap", ARG_SEGTRAP_DISABLE}, {
1188 "--gst-disable-registry-fork", ARG_REGISTRY_FORK_DISABLE}, {
1193 for (n = 0; options[n].opt; n++) {
1194 if (!strcmp (opt, options[n].opt)) {
1195 val = options[n].val;
1200 return parse_one_option (val, arg, err);
1204 extern GstRegistry *_gst_registry_default;
1209 * Clean up any resources created by GStreamer in gst_init().
1211 * It is normally not needed to call this function in a normal application
1212 * as the resources will automatically be freed when the program terminates.
1213 * This function is therefore mostly used by testsuites and other memory
1216 * After this call GStreamer (including this method) should not be used anymore.
1223 GST_INFO ("deinitializing GStreamer");
1225 if (!gst_initialized) {
1226 GST_DEBUG ("already deinitialized");
1230 g_slist_foreach (preload_plugins, (GFunc) g_free, NULL);
1231 g_slist_free (preload_plugins);
1232 preload_plugins = NULL;
1234 #ifndef GST_DISABLE_REGISTRY
1235 g_list_foreach (plugin_paths, (GFunc) g_free, NULL);
1236 g_list_free (plugin_paths);
1237 plugin_paths = NULL;
1240 clock = gst_system_clock_obtain ();
1241 gst_object_unref (clock);
1242 gst_object_unref (clock);
1244 _priv_gst_registry_cleanup ();
1246 gst_initialized = FALSE;
1247 GST_INFO ("deinitialized GStreamer");
1252 * @major: pointer to a guint to store the major version number
1253 * @minor: pointer to a guint to store the minor version number
1254 * @micro: pointer to a guint to store the micro version number
1255 * @nano: pointer to a guint to store the nano version number
1257 * Gets the version number of the GStreamer library.
1260 gst_version (guint * major, guint * minor, guint * micro, guint * nano)
1262 g_return_if_fail (major);
1263 g_return_if_fail (minor);
1264 g_return_if_fail (micro);
1265 g_return_if_fail (nano);
1267 *major = GST_VERSION_MAJOR;
1268 *minor = GST_VERSION_MINOR;
1269 *micro = GST_VERSION_MICRO;
1270 *nano = GST_VERSION_NANO;
1274 * gst_version_string:
1276 * This function returns a string that is useful for describing this version
1277 * of GStreamer to the outside world: user agent strings, logging, ...
1279 * Returns: a newly allocated string describing this version of GStreamer.
1283 gst_version_string ()
1285 guint major, minor, micro, nano;
1287 gst_version (&major, &minor, µ, &nano);
1289 return g_strdup_printf ("GStreamer %d.%d.%d", major, minor, micro);
1291 return g_strdup_printf ("GStreamer %d.%d.%d (CVS)", major, minor, micro);
1293 return g_strdup_printf ("GStreamer %d.%d.%d (prerelease)", major, minor,
1298 * gst_segtrap_is_enabled:
1300 * Some functions in the GStreamer core might install a custom SIGSEGV handler
1301 * to better catch and report errors to the application. Currently this feature
1302 * is enabled by default when loading plugins.
1304 * Applications might want to disable this behaviour with the
1305 * gst_segtrap_set_enabled() function. This is typically done if the application
1306 * wants to install its own handler without GStreamer interfering.
1308 * Returns: %TRUE if GStreamer is allowed to install a custom SIGSEGV handler.
1313 gst_segtrap_is_enabled (void)
1315 /* yeps, it's enabled when it's not disabled */
1316 return !_gst_disable_segtrap;
1320 * gst_segtrap_set_enabled:
1321 * @enabled: whether a custom SIGSEGV handler should be installed.
1323 * Applications might want to disable/enable the SIGSEGV handling of
1324 * the GStreamer core. See gst_segtrap_is_enabled() for more information.
1329 gst_segtrap_set_enabled (gboolean enabled)
1331 _gst_disable_segtrap = !enabled;
1335 * gst_registry_fork_is_enabled:
1337 * By default GStreamer will perform a fork() when scanning and rebuilding the
1340 * Applications might want to disable this behaviour with the
1341 * gst_registry_fork_set_enabled() function.
1343 * Returns: %TRUE if GStreamer will use fork() when rebuilding the registry. On
1344 * platforms without fork(), this function will always return %FALSE.
1349 gst_registry_fork_is_enabled (void)
1351 return _gst_enable_registry_fork;
1355 * gst_registry_fork_set_enabled:
1356 * @enabled: whether rebuilding the registry may fork
1358 * Applications might want to disable/enable the usage of fork() when rebuilding
1359 * the registry. See gst_registry_fork_is_enabled() for more information.
1361 * On platforms without fork(), this function will have no effect on the return
1362 * value of gst_registry_fork_is_enabled().
1367 gst_registry_fork_set_enabled (gboolean enabled)
1370 _gst_enable_registry_fork = enabled;
1371 #endif /* HAVE_FORK */
1376 * gst_update_registry:
1378 * Forces GStreamer to re-scan its plugin paths and update the default
1381 * Applications will almost never need to call this function, it is only
1382 * useful if the application knows new plugins have been installed (or old
1383 * ones removed) since the start of the application (or, to be precise, the
1384 * first call to gst_init()) and the application wants to make use of any
1385 * newly-installed plugins without restarting the application.
1387 * Applications should assume that the registry update is neither atomic nor
1388 * thread-safe and should therefore not have any dynamic pipelines running
1389 * (including the playbin and decodebin elements) and should also not create
1390 * any elements or access the GStreamer registry while the update is in
1393 * Note that this function may block for a significant amount of time.
1395 * Returns: %TRUE if the registry has been updated successfully (does not
1396 * imply that there were changes), otherwise %FALSE.
1401 gst_update_registry (void)
1403 gboolean res = FALSE;
1405 #ifndef GST_DISABLE_REGISTRY
1408 res = ensure_current_registry (&err);
1410 GST_WARNING ("registry update failed: %s", err->message);
1413 GST_LOG ("registry update succeeded");
1416 if (preload_plugins) {
1417 g_slist_foreach (preload_plugins, load_plugin_func, NULL);
1420 GST_WARNING ("registry update failed: %s", "registry disabled");
1421 #endif /* GST_DISABLE_REGISTRY */