2 * Copyright (C) 2001 RidgeRun (http://www.ridgerun.com/)
3 * Written by Erik Walthinsen <omega@ridgerun.com>
5 * gstindex.c: Index for mappings and other data
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: Generate indexes on objects
26 * @see_also: #GstIndexFactory
28 * GstIndex is used to generate a stream index of one or more elements
32 #include "gst_private.h"
36 #include "gstindexfactory.h"
37 #include "gstmarshal.h"
38 #include "gstregistry.h"
39 /* for constructing an entry name */
40 #include "gstelement.h"
44 /* Index signals and args */
58 GST_DEBUG_CATEGORY_STATIC (index_debug);
59 #define GST_CAT_DEFAULT index_debug
61 static void gst_index_class_init (GstIndexClass * klass);
62 static void gst_index_init (GstIndex * index);
63 static void gst_index_finalize (GObject * object);
65 static void gst_index_set_property (GObject * object, guint prop_id,
66 const GValue * value, GParamSpec * pspec);
67 static void gst_index_get_property (GObject * object, guint prop_id,
68 GValue * value, GParamSpec * pspec);
70 static GstIndexGroup *gst_index_group_new (guint groupnum);
72 static gboolean gst_index_path_resolver (GstIndex * index, GstObject * writer,
73 gchar ** writer_string, gpointer data);
74 static gboolean gst_index_gtype_resolver (GstIndex * index, GstObject * writer,
75 gchar ** writer_string, gpointer data);
76 static void gst_index_add_entry (GstIndex * index, GstIndexEntry * entry);
78 static GstObject *parent_class = NULL;
79 static guint gst_index_signals[LAST_SIGNAL] = { 0 };
83 GstIndexResolverMethod method;
84 GstIndexResolver resolver;
89 static const ResolverEntry resolvers[] = {
90 {GST_INDEX_RESOLVER_CUSTOM, NULL, NULL},
91 {GST_INDEX_RESOLVER_GTYPE, gst_index_gtype_resolver, NULL},
92 {GST_INDEX_RESOLVER_PATH, gst_index_path_resolver, NULL},
95 #define GST_TYPE_INDEX_RESOLVER (gst_index_resolver_get_type())
97 gst_index_resolver_get_type (void)
99 static GType index_resolver_type = 0;
100 static const GEnumValue index_resolver[] = {
101 {GST_INDEX_RESOLVER_CUSTOM, "GST_INDEX_RESOLVER_CUSTOM", "custom"},
102 {GST_INDEX_RESOLVER_GTYPE, "GST_INDEX_RESOLVER_GTYPE", "gtype"},
103 {GST_INDEX_RESOLVER_PATH, "GST_INDEX_RESOLVER_PATH", "path"},
107 if (!index_resolver_type) {
108 index_resolver_type =
109 g_enum_register_static ("GstIndexResolver", index_resolver);
111 return index_resolver_type;
115 gst_index_entry_get_type (void)
117 static GType index_entry_type = 0;
119 if (!index_entry_type) {
120 index_entry_type = g_boxed_type_register_static ("GstIndexEntry",
121 (GBoxedCopyFunc) gst_index_entry_copy,
122 (GBoxedFreeFunc) gst_index_entry_free);
124 return index_entry_type;
129 gst_index_get_type (void)
131 static GType index_type = 0;
134 static const GTypeInfo index_info = {
135 sizeof (GstIndexClass),
138 (GClassInitFunc) gst_index_class_init,
143 (GInstanceInitFunc) gst_index_init,
148 g_type_register_static (GST_TYPE_OBJECT, "GstIndex", &index_info, 0);
150 GST_DEBUG_CATEGORY_INIT (index_debug, "GST_INDEX", GST_DEBUG_BOLD,
151 "Generic indexing support");
157 gst_index_class_init (GstIndexClass * klass)
159 GObjectClass *gobject_class;
161 gobject_class = G_OBJECT_CLASS (klass);
163 parent_class = g_type_class_peek_parent (klass);
166 * GstIndex::entry-added
167 * @gstindex: the object which received the signal.
168 * @arg1: The entry added to the index.
170 * Is emitted when a new entry is added to the index.
172 gst_index_signals[ENTRY_ADDED] =
173 g_signal_new ("entry-added", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
174 G_STRUCT_OFFSET (GstIndexClass, entry_added), NULL, NULL,
175 gst_marshal_VOID__BOXED, G_TYPE_NONE, 1, GST_TYPE_INDEX_ENTRY);
177 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_index_set_property);
178 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_index_get_property);
179 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_index_finalize);
181 g_object_class_install_property (gobject_class, ARG_RESOLVER,
182 g_param_spec_enum ("resolver", "Resolver",
183 "Select a predefined object to string mapper",
184 GST_TYPE_INDEX_RESOLVER, GST_INDEX_RESOLVER_PATH,
185 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
189 gst_index_init (GstIndex * index)
191 index->curgroup = gst_index_group_new (0);
193 index->groups = g_list_prepend (NULL, index->curgroup);
195 index->writers = g_hash_table_new (NULL, NULL);
198 index->method = GST_INDEX_RESOLVER_PATH;
199 index->resolver = resolvers[index->method].resolver;
200 index->resolver_user_data = resolvers[index->method].user_data;
202 GST_OBJECT_FLAG_SET (index, GST_INDEX_WRITABLE);
203 GST_OBJECT_FLAG_SET (index, GST_INDEX_READABLE);
205 GST_DEBUG ("created new index");
209 gst_index_free_writer (gpointer key, gpointer value, gpointer user_data)
211 GstIndexEntry *entry = (GstIndexEntry *) value;
214 gst_index_entry_free (entry);
219 gst_index_finalize (GObject * object)
221 GstIndex *index = GST_INDEX (object);
224 g_list_foreach (index->groups, (GFunc) g_free, NULL);
225 g_list_free (index->groups);
226 index->groups = NULL;
229 if (index->writers) {
230 g_hash_table_foreach (index->writers, gst_index_free_writer, NULL);
231 g_hash_table_destroy (index->writers);
232 index->writers = NULL;
235 if (index->filter_user_data && index->filter_user_data_destroy)
236 index->filter_user_data_destroy (index->filter_user_data);
238 if (index->resolver_user_data && index->resolver_user_data_destroy)
239 index->resolver_user_data_destroy (index->resolver_user_data);
241 G_OBJECT_CLASS (parent_class)->finalize (object);
245 gst_index_set_property (GObject * object, guint prop_id,
246 const GValue * value, GParamSpec * pspec)
250 index = GST_INDEX (object);
254 index->method = g_value_get_enum (value);
255 index->resolver = resolvers[index->method].resolver;
256 index->resolver_user_data = resolvers[index->method].user_data;
259 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
265 gst_index_get_property (GObject * object, guint prop_id,
266 GValue * value, GParamSpec * pspec)
270 index = GST_INDEX (object);
274 g_value_set_enum (value, index->method);
277 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
282 static GstIndexGroup *
283 gst_index_group_new (guint groupnum)
285 GstIndexGroup *indexgroup = g_new (GstIndexGroup, 1);
287 indexgroup->groupnum = groupnum;
288 indexgroup->entries = NULL;
289 indexgroup->certainty = GST_INDEX_UNKNOWN;
290 indexgroup->peergroup = -1;
292 GST_DEBUG ("created new index group %d", groupnum);
300 * Create a new tileindex object
302 * Returns: a new index object
309 index = g_object_new (gst_index_get_type (), NULL);
316 * @index: the index to commit
317 * @id: the writer that commited the index
319 * Tell the index that the writer with the given id is done
320 * with this index and is not going to write any more entries
324 gst_index_commit (GstIndex * index, gint id)
326 GstIndexClass *iclass;
328 iclass = GST_INDEX_GET_CLASS (index);
331 iclass->commit (index, id);
336 * gst_index_get_group:
337 * @index: the index to get the current group from
339 * Get the id of the current group.
341 * Returns: the id of the current group.
344 gst_index_get_group (GstIndex * index)
346 return index->curgroup->groupnum;
350 * gst_index_new_group:
351 * @index: the index to create the new group in
353 * Create a new group for the given index. It will be
354 * set as the current group.
356 * Returns: the id of the newly created group.
359 gst_index_new_group (GstIndex * index)
361 index->curgroup = gst_index_group_new (++index->maxgroup);
362 index->groups = g_list_append (index->groups, index->curgroup);
363 GST_DEBUG ("created new group %d in index", index->maxgroup);
364 return index->maxgroup;
368 * gst_index_set_group:
369 * @index: the index to set the new group in
370 * @groupnum: the groupnumber to set
372 * Set the current groupnumber to the given argument.
374 * Returns: TRUE if the operation succeeded, FALSE if the group
378 gst_index_set_group (GstIndex * index, gint groupnum)
381 GstIndexGroup *indexgroup;
383 /* first check for null change */
384 if (groupnum == index->curgroup->groupnum)
387 /* else search for the proper group */
388 list = index->groups;
390 indexgroup = (GstIndexGroup *) (list->data);
391 list = g_list_next (list);
392 if (indexgroup->groupnum == groupnum) {
393 index->curgroup = indexgroup;
394 GST_DEBUG ("switched to index group %d", indexgroup->groupnum);
399 /* couldn't find the group in question */
400 GST_DEBUG ("couldn't find index group %d", groupnum);
405 * gst_index_set_certainty:
406 * @index: the index to set the certainty on
407 * @certainty: the certainty to set
409 * Set the certainty of the given index.
412 gst_index_set_certainty (GstIndex * index, GstIndexCertainty certainty)
414 index->curgroup->certainty = certainty;
418 * gst_index_get_certainty:
419 * @index: the index to get the certainty of
421 * Get the certainty of the given index.
423 * Returns: the certainty of the index.
426 gst_index_get_certainty (GstIndex * index)
428 return index->curgroup->certainty;
432 * gst_index_set_filter:
433 * @index: the index to register the filter on
434 * @filter: the filter to register
435 * @user_data: data passed to the filter function
437 * Lets the app register a custom filter function so that
438 * it can select what entries should be stored in the index.
441 gst_index_set_filter (GstIndex * index,
442 GstIndexFilter filter, gpointer user_data)
444 g_return_if_fail (GST_IS_INDEX (index));
446 gst_index_set_filter_full (index, filter, user_data, NULL);
450 * gst_index_set_filter_full:
451 * @index: the index to register the filter on
452 * @filter: the filter to register
453 * @user_data: data passed to the filter function
454 * @user_data_destroy: function to call when @user_data is unset
456 * Lets the app register a custom filter function so that
457 * it can select what entries should be stored in the index.
460 gst_index_set_filter_full (GstIndex * index,
461 GstIndexFilter filter, gpointer user_data, GDestroyNotify user_data_destroy)
463 g_return_if_fail (GST_IS_INDEX (index));
465 if (index->filter_user_data && index->filter_user_data_destroy)
466 index->filter_user_data_destroy (index->filter_user_data);
468 index->filter = filter;
469 index->filter_user_data = user_data;
470 index->filter_user_data_destroy = user_data_destroy;
474 * gst_index_set_resolver:
475 * @index: the index to register the resolver on
476 * @resolver: the resolver to register
477 * @user_data: data passed to the resolver function
479 * Lets the app register a custom function to map index
480 * ids to writer descriptions.
483 gst_index_set_resolver (GstIndex * index,
484 GstIndexResolver resolver, gpointer user_data)
486 gst_index_set_resolver_full (index, resolver, user_data, NULL);
490 * gst_index_set_resolver_full:
491 * @index: the index to register the resolver on
492 * @resolver: the resolver to register
493 * @user_data: data passed to the resolver function
494 * @user_data_destroy: destroy function for @user_data
496 * Lets the app register a custom function to map index
497 * ids to writer descriptions.
502 gst_index_set_resolver_full (GstIndex * index, GstIndexResolver resolver,
503 gpointer user_data, GDestroyNotify user_data_destroy)
505 g_return_if_fail (GST_IS_INDEX (index));
507 if (index->resolver_user_data && index->resolver_user_data_destroy)
508 index->resolver_user_data_destroy (index->resolver_user_data);
510 index->resolver = resolver;
511 index->resolver_user_data = user_data;
512 index->resolver_user_data_destroy = user_data_destroy;
513 index->method = GST_INDEX_RESOLVER_CUSTOM;
517 * gst_index_entry_copy:
518 * @entry: the entry to copy
520 * Copies an entry and returns the result.
522 * Returns: a newly allocated #GstIndexEntry.
525 gst_index_entry_copy (GstIndexEntry * entry)
527 return g_memdup (entry, sizeof (*entry));
531 * gst_index_entry_free:
532 * @entry: the entry to free
534 * Free the memory used by the given entry.
537 gst_index_entry_free (GstIndexEntry * entry)
539 switch (entry->type) {
540 case GST_INDEX_ENTRY_ID:
541 if (entry->data.id.description) {
542 g_free (entry->data.id.description);
543 entry->data.id.description = NULL;
546 case GST_INDEX_ENTRY_ASSOCIATION:
547 if (entry->data.assoc.assocs) {
548 g_free (entry->data.assoc.assocs);
549 entry->data.assoc.assocs = NULL;
552 case GST_INDEX_ENTRY_OBJECT:
554 case GST_INDEX_ENTRY_FORMAT:
562 * gst_index_add_format:
563 * @index: the index to add the entry to
564 * @id: the id of the index writer
565 * @format: the format to add to the index
567 * Adds a format entry into the index. This function is
568 * used to map dynamic GstFormat ids to their original
571 * Returns: a pointer to the newly added entry in the index.
574 gst_index_add_format (GstIndex * index, gint id, GstFormat format)
576 GstIndexEntry *entry;
577 const GstFormatDefinition *def;
579 g_return_val_if_fail (GST_IS_INDEX (index), NULL);
580 g_return_val_if_fail (format != 0, NULL);
582 if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
585 entry = g_new0 (GstIndexEntry, 1);
586 entry->type = GST_INDEX_ENTRY_FORMAT;
588 entry->data.format.format = format;
590 def = gst_format_get_details (format);
591 entry->data.format.key = def->nick;
593 gst_index_add_entry (index, entry);
600 * @index: the index to add the entry to
601 * @id: the id of the index writer
602 * @description: the description of the index writer
604 * Add an id entry into the index.
606 * Returns: a pointer to the newly added entry in the index.
609 gst_index_add_id (GstIndex * index, gint id, gchar * description)
611 GstIndexEntry *entry;
613 g_return_val_if_fail (GST_IS_INDEX (index), NULL);
614 g_return_val_if_fail (description != NULL, NULL);
616 if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
619 entry = g_new0 (GstIndexEntry, 1);
620 entry->type = GST_INDEX_ENTRY_ID;
622 entry->data.id.description = description;
624 gst_index_add_entry (index, entry);
630 gst_index_path_resolver (GstIndex * index, GstObject * writer,
631 gchar ** writer_string, gpointer data)
633 *writer_string = gst_object_get_path_string (writer);
639 gst_index_gtype_resolver (GstIndex * index, GstObject * writer,
640 gchar ** writer_string, gpointer data)
642 if (GST_IS_PAD (writer)) {
643 GstElement *element =
644 (GstElement *) gst_object_get_parent (GST_OBJECT (writer));
647 name = gst_object_get_name (writer);
648 *writer_string = g_strdup_printf ("%s.%s",
649 g_type_name (G_OBJECT_TYPE (element)), name);
651 gst_object_unref (element);
656 g_strdup_printf ("%s", g_type_name (G_OBJECT_TYPE (writer)));
663 * gst_index_get_writer_id:
664 * @index: the index to get a unique write id for
665 * @writer: the GstObject to allocate an id for
666 * @id: a pointer to a gint to hold the id
668 * Before entries can be added to the index, a writer
669 * should obtain a unique id. The methods to add new entries
670 * to the index require this id as an argument.
672 * The application can implement a custom function to map the writer object
673 * to a string. That string will be used to register or look up an id
676 * Returns: TRUE if the writer would be mapped to an id.
679 gst_index_get_writer_id (GstIndex * index, GstObject * writer, gint * id)
681 gchar *writer_string = NULL;
682 GstIndexEntry *entry;
683 GstIndexClass *iclass;
684 gboolean success = FALSE;
686 g_return_val_if_fail (GST_IS_INDEX (index), FALSE);
687 g_return_val_if_fail (GST_IS_OBJECT (writer), FALSE);
688 g_return_val_if_fail (id, FALSE);
692 /* first try to get a previously cached id */
693 entry = g_hash_table_lookup (index->writers, writer);
696 iclass = GST_INDEX_GET_CLASS (index);
698 /* let the app make a string */
699 if (index->resolver) {
703 index->resolver (index, writer, &writer_string,
704 index->resolver_user_data);
708 g_warning ("no resolver found");
712 /* if the index has a resolver, make it map this string to an id */
713 if (iclass->get_writer_id) {
714 success = iclass->get_writer_id (index, id, writer_string);
716 /* if the index could not resolve, we allocate one ourselves */
718 *id = ++index->last_id;
721 entry = gst_index_add_id (index, *id, writer_string);
723 /* index is probably not writable, make an entry anyway
724 * to keep it in our cache */
725 entry = g_new0 (GstIndexEntry, 1);
726 entry->type = GST_INDEX_ENTRY_ID;
728 entry->data.id.description = writer_string;
730 g_hash_table_insert (index->writers, writer, entry);
739 gst_index_add_entry (GstIndex * index, GstIndexEntry * entry)
741 GstIndexClass *iclass;
743 iclass = GST_INDEX_GET_CLASS (index);
745 if (iclass->add_entry) {
746 iclass->add_entry (index, entry);
749 g_signal_emit (G_OBJECT (index), gst_index_signals[ENTRY_ADDED], 0, entry);
753 * gst_index_add_associationv:
754 * @index: the index to add the entry to
755 * @id: the id of the index writer
756 * @flags: optinal flags for this entry
757 * @n: number of associations
758 * @list: list of associations
760 * Associate given format/value pairs with each other.
762 * Returns: a pointer to the newly added entry in the index.
765 gst_index_add_associationv (GstIndex * index, gint id, GstAssocFlags flags,
766 gint n, const GstIndexAssociation * list)
768 GstIndexEntry *entry;
770 g_return_val_if_fail (n > 0, NULL);
771 g_return_val_if_fail (list != NULL, NULL);
772 g_return_val_if_fail (GST_IS_INDEX (index), NULL);
774 if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
777 entry = g_malloc (sizeof (GstIndexEntry));
779 entry->type = GST_INDEX_ENTRY_ASSOCIATION;
781 entry->data.assoc.flags = flags;
782 entry->data.assoc.assocs = g_memdup (list, sizeof (GstIndexAssociation) * n);
783 entry->data.assoc.nassocs = n;
785 gst_index_add_entry (index, entry);
791 * gst_index_add_association:
792 * @index: the index to add the entry to
793 * @id: the id of the index writer
794 * @flags: optinal flags for this entry
795 * @format: the format of the value
797 * @...: other format/value pairs or 0 to end the list
799 * Associate given format/value pairs with each other.
800 * Be sure to pass gint64 values to this functions varargs,
801 * you might want to use a gint64 cast to be sure.
803 * Returns: a pointer to the newly added entry in the index.
806 gst_index_add_association (GstIndex * index, gint id, GstAssocFlags flags,
807 GstFormat format, gint64 value, ...)
810 GstIndexEntry *entry;
811 GstIndexAssociation *list;
813 GstFormat cur_format;
816 g_return_val_if_fail (GST_IS_INDEX (index), NULL);
817 g_return_val_if_fail (format != 0, NULL);
819 if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
822 array = g_array_new (FALSE, FALSE, sizeof (GstIndexAssociation));
825 GstIndexAssociation a;
830 g_array_append_val (array, a);
833 va_start (args, value);
835 while ((cur_format = va_arg (args, GstFormat))) {
836 GstIndexAssociation a;
838 a.format = cur_format;
839 a.value = va_arg (args, gint64);
841 g_array_append_val (array, a);
846 list = (GstIndexAssociation *) g_array_free (array, FALSE);
848 entry = gst_index_add_associationv (index, id, flags, n_assocs, list);
855 * gst_index_add_object:
856 * @index: the index to add the object to
857 * @id: the id of the index writer
858 * @key: a key for the object
859 * @type: the GType of the object
860 * @object: a pointer to the object to add
862 * Add the given object to the index with the given key.
864 * This function is not yet implemented.
866 * Returns: a pointer to the newly added entry in the index.
869 gst_index_add_object (GstIndex * index, gint id, gchar * key,
870 GType type, gpointer object)
872 if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
879 gst_index_compare_func (gconstpointer a, gconstpointer b, gpointer user_data)
889 * gst_index_get_assoc_entry:
890 * @index: the index to search
891 * @id: the id of the index writer
892 * @method: The lookup method to use
893 * @flags: Flags for the entry
894 * @format: the format of the value
895 * @value: the value to find
897 * Finds the given format/value in the index
899 * Returns: the entry associated with the value or NULL if the
900 * value was not found.
903 gst_index_get_assoc_entry (GstIndex * index, gint id,
904 GstIndexLookupMethod method, GstAssocFlags flags,
905 GstFormat format, gint64 value)
907 g_return_val_if_fail (GST_IS_INDEX (index), NULL);
912 return gst_index_get_assoc_entry_full (index, id, method, flags, format,
913 value, gst_index_compare_func, NULL);
917 * gst_index_get_assoc_entry_full:
918 * @index: the index to search
919 * @id: the id of the index writer
920 * @method: The lookup method to use
921 * @flags: Flags for the entry
922 * @format: the format of the value
923 * @value: the value to find
924 * @func: the function used to compare entries
925 * @user_data: user data passed to the compare function
927 * Finds the given format/value in the index with the given
928 * compare function and user_data.
930 * Returns: the entry associated with the value or NULL if the
931 * value was not found.
934 gst_index_get_assoc_entry_full (GstIndex * index, gint id,
935 GstIndexLookupMethod method, GstAssocFlags flags,
936 GstFormat format, gint64 value, GCompareDataFunc func, gpointer user_data)
938 GstIndexClass *iclass;
940 g_return_val_if_fail (GST_IS_INDEX (index), NULL);
945 iclass = GST_INDEX_GET_CLASS (index);
947 if (iclass->get_assoc_entry)
948 return iclass->get_assoc_entry (index, id, method, flags, format, value,
955 * gst_index_entry_assoc_map:
956 * @entry: the index to search
957 * @format: the format of the value the find
958 * @value: a pointer to store the value
960 * Gets alternative formats associated with the indexentry.
962 * Returns: TRUE if there was a value associated with the given
966 gst_index_entry_assoc_map (GstIndexEntry * entry,
967 GstFormat format, gint64 * value)
971 g_return_val_if_fail (entry != NULL, FALSE);
972 g_return_val_if_fail (value != NULL, FALSE);
974 for (i = 0; i < GST_INDEX_NASSOCS (entry); i++) {
975 if (GST_INDEX_ASSOC_FORMAT (entry, i) == format) {
976 *value = GST_INDEX_ASSOC_VALUE (entry, i);