2 * (c) 2010, 2012 Alexander Saprykin <xelfium@gmail.com>
4 * gsttoc.c: GstToc initialization and parsing/creation
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
24 * @short_description: Generic table of contents support
25 * @see_also: #GstStructure, #GstEvent, #GstMessage, #GstQuery
27 * #GstToc functions are used to create/free #GstToc and #GstTocEntry structures.
28 * Also they are used to convert #GstToc into #GstStructure and vice versa.
30 * #GstToc lets you to inform other elements in pipeline or application that playing
31 * source has some kind of table of contents (TOC). These may be chapters, editions,
32 * angles or other types. For example: DVD chapters, Matroska chapters or cue sheet
33 * TOC. Such TOC will be useful for applications to display instead of just a
36 * Using TOC is very easy. Firstly, create #GstToc structure which represents root
37 * contents of the source. You can also attach TOC-specific tags to it. Then fill
38 * it with #GstTocEntry entries by appending them to #GstToc.entries #GstTocEntry.subentries
39 * lists. You should use GST_TOC_ENTRY_TYPE_CHAPTER for generic TOC entry and
40 * GST_TOC_ENTRY_TYPE_EDITION for the entries which are considered to be alternatives
41 * (like DVD angles, Matroska editions and so on).
43 * Note that root level of the TOC can contain only either editions or chapters. You
44 * should not mix them together at the same level. Otherwise you will get serialization
45 * /deserialization errors. Make sure that no one of the entries has negative start and
48 * Please, use #GstToc.info and #GstTocEntry.info fields in that way: create a #GstStructure,
49 * put all info related to your element there and put this structure into the info field under
50 * the name of your element. Some fields in the info structure can be used for internal purposes,
51 * so you should use it in the way described above to not to overwrite already existent fields.
53 * Use gst_event_new_toc() to create a new TOC #GstEvent, and gst_event_parse_toc() to
54 * parse received TOC event. Use gst_event_new_toc_select() to create a new TOC select #GstEvent,
55 * and gst_event_parse_toc_select() to parse received TOC select event. The same rule for
56 * the #GstMessage: gst_message_new_toc() to create new TOC #GstMessage, and
57 * gst_message_parse_toc() to parse received TOC message. Also you can create a new TOC query
58 * with gst_query_new_toc(), set it with gst_query_set_toc() and parse it with
59 * gst_query_parse_toc().
66 #include "gst_private.h"
67 #include "gstenumtypes.h"
68 #include "gsttaglist.h"
69 #include "gststructure.h"
77 GstMiniObject mini_object;
84 GstClockTime start, stop;
91 GstMiniObject mini_object;
99 static GstToc *gst_toc_copy (const GstToc * toc);
100 static void gst_toc_free (GstToc * toc);
101 #undef gst_toc_entry_copy
102 static GstTocEntry *gst_toc_entry_copy (const GstTocEntry * toc);
103 static void gst_toc_entry_free (GstTocEntry * toc);
105 GST_DEFINE_MINI_OBJECT_TYPE (GstToc, gst_toc);
106 GST_DEFINE_MINI_OBJECT_TYPE (GstTocEntry, gst_toc_entry);
110 * @scope: scope of this TOC
112 * Create a new #GstToc structure.
114 * Returns: (transfer full): newly allocated #GstToc structure, free it
115 * with gst_toc_unref().
118 gst_toc_new (GstTocScope scope)
122 g_return_val_if_fail (scope == GST_TOC_SCOPE_GLOBAL ||
123 scope == GST_TOC_SCOPE_CURRENT, NULL);
125 toc = g_slice_new0 (GstToc);
127 gst_mini_object_init (GST_MINI_OBJECT_CAST (toc), 0, GST_TYPE_TOC,
128 (GstMiniObjectCopyFunction) gst_toc_copy, NULL,
129 (GstMiniObjectFreeFunction) gst_toc_free);
132 toc->tags = gst_tag_list_new_empty ();
139 * @toc: a #GstToc instance
141 * Returns: scope of @toc
144 gst_toc_get_scope (const GstToc * toc)
146 g_return_val_if_fail (toc != NULL, GST_TOC_SCOPE_GLOBAL);
153 * @toc: A #GstToc instance
154 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
156 * Set a #GstTagList with tags for the complete @toc.
159 gst_toc_set_tags (GstToc * toc, GstTagList * tags)
161 g_return_if_fail (toc != NULL);
162 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
165 gst_tag_list_unref (toc->tags);
170 * gst_toc_merge_tags:
171 * @toc: A #GstToc instance
172 * @tags: (allow-none): A #GstTagList or %NULL
173 * @mode: A #GstTagMergeMode
175 * Merge @tags into the existing tags of @toc using @mode.
178 gst_toc_merge_tags (GstToc * toc, GstTagList * tags, GstTagMergeMode mode)
180 g_return_if_fail (toc != NULL);
181 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
184 toc->tags = gst_tag_list_ref (tags);
186 GstTagList *tmp = gst_tag_list_merge (toc->tags, tags, mode);
187 gst_tag_list_unref (toc->tags);
194 * @toc: A #GstToc instance
196 * Gets the tags for @toc.
198 * Returns: (transfer none): A #GstTagList for @entry
201 gst_toc_get_tags (const GstToc * toc)
203 g_return_val_if_fail (toc != NULL, NULL);
209 * gst_toc_append_entry:
210 * @toc: A #GstToc instance
211 * @entry: (transfer full): A #GstTocEntry
213 * Appends the #GstTocEntry @entry to @toc.
216 gst_toc_append_entry (GstToc * toc, GstTocEntry * entry)
218 g_return_if_fail (toc != NULL);
219 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
220 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
221 g_return_if_fail (entry->toc == NULL);
222 g_return_if_fail (entry->parent == NULL);
224 toc->entries = g_list_append (toc->entries, entry);
227 GST_LOG ("appended %s entry with uid %s to toc %p",
228 gst_toc_entry_type_get_nick (entry->type), entry->uid, toc);
234 * gst_toc_get_entries:
235 * @toc: A #GstToc instance
237 * Gets the list of #GstTocEntry of @toc.
239 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry for @entry
242 gst_toc_get_entries (const GstToc * toc)
244 g_return_val_if_fail (toc != NULL, NULL);
250 gst_toc_entry_new_internal (GstTocEntryType type, const gchar * uid)
254 entry = g_slice_new0 (GstTocEntry);
256 gst_mini_object_init (GST_MINI_OBJECT_CAST (entry), 0, GST_TYPE_TOC_ENTRY,
257 (GstMiniObjectCopyFunction) gst_toc_entry_copy, NULL,
258 (GstMiniObjectFreeFunction) gst_toc_entry_free);
260 entry->uid = g_strdup (uid);
263 entry->start = entry->stop = GST_CLOCK_TIME_NONE;
271 * @uid: unique ID (UID) in the whole TOC.
273 * Create new #GstTocEntry structure.
275 * Returns: newly allocated #GstTocEntry structure, free it with gst_toc_entry_unref().
278 gst_toc_entry_new (GstTocEntryType type, const gchar * uid)
280 g_return_val_if_fail (uid != NULL, NULL);
282 return gst_toc_entry_new_internal (type, uid);
286 gst_toc_free (GstToc * toc)
288 g_list_foreach (toc->entries, (GFunc) gst_mini_object_unref, NULL);
289 g_list_free (toc->entries);
291 if (toc->tags != NULL)
292 gst_tag_list_unref (toc->tags);
294 g_slice_free (GstToc, toc);
298 gst_toc_entry_free (GstTocEntry * entry)
300 g_return_if_fail (entry != NULL);
302 g_list_foreach (entry->subentries, (GFunc) gst_mini_object_unref, NULL);
303 g_list_free (entry->subentries);
307 if (entry->tags != NULL)
308 gst_tag_list_unref (entry->tags);
310 g_slice_free (GstTocEntry, entry);
314 gst_toc_entry_find_sub_entry (const GstTocEntry * entry, const gchar * uid)
317 GstTocEntry *subentry, *subsubentry;
319 g_return_val_if_fail (entry != NULL, NULL);
320 g_return_val_if_fail (uid != NULL, NULL);
322 cur = entry->subentries;
323 while (cur != NULL) {
324 subentry = cur->data;
326 if (g_strcmp0 (subentry->uid, uid) == 0)
329 subsubentry = gst_toc_entry_find_sub_entry (subentry, uid);
330 if (subsubentry != NULL)
340 * gst_toc_find_entry:
341 * @toc: #GstToc to search in.
342 * @uid: UID to find #GstTocEntry with.
344 * Find #GstTocEntry with given @uid in the @toc.
346 * Returns: (transfer none): #GstTocEntry with specified @uid from the @toc, or NULL if not found.
349 gst_toc_find_entry (const GstToc * toc, const gchar * uid)
352 GstTocEntry *entry, *subentry;
354 g_return_val_if_fail (toc != NULL, NULL);
355 g_return_val_if_fail (uid != NULL, NULL);
358 while (cur != NULL) {
361 if (g_strcmp0 (entry->uid, uid) == 0)
364 subentry = gst_toc_entry_find_sub_entry (entry, uid);
365 if (subentry != NULL)
374 * gst_toc_entry_copy:
375 * @entry: #GstTocEntry to copy.
377 * Copy #GstTocEntry with all subentries (deep copy).
379 * Returns: newly allocated #GstTocEntry in case of success, NULL otherwise;
380 * free it when done with gst_toc_entry_unref().
383 gst_toc_entry_copy (const GstTocEntry * entry)
385 GstTocEntry *ret, *sub;
389 g_return_val_if_fail (entry != NULL, NULL);
391 ret = gst_toc_entry_new (entry->type, entry->uid);
393 ret->start = entry->start;
394 ret->stop = entry->stop;
396 if (GST_IS_TAG_LIST (entry->tags)) {
397 list = gst_tag_list_copy (entry->tags);
399 gst_tag_list_unref (ret->tags);
403 cur = entry->subentries;
404 while (cur != NULL) {
405 sub = gst_toc_entry_copy (cur->data);
408 ret->subentries = g_list_prepend (ret->subentries, sub);
412 ret->subentries = g_list_reverse (ret->subentries);
419 * @toc: #GstToc to copy.
421 * Copy #GstToc with all subentries (deep copy).
423 * Returns: newly allocated #GstToc in case of success, NULL otherwise;
424 * free it when done with gst_toc_free().
427 gst_toc_copy (const GstToc * toc)
434 g_return_val_if_fail (toc != NULL, NULL);
436 ret = gst_toc_new (toc->scope);
438 if (GST_IS_TAG_LIST (toc->tags)) {
439 list = gst_tag_list_copy (toc->tags);
440 gst_tag_list_unref (ret->tags);
445 while (cur != NULL) {
446 entry = gst_toc_entry_copy (cur->data);
449 ret->entries = g_list_prepend (ret->entries, entry);
453 ret->entries = g_list_reverse (ret->entries);
458 * gst_toc_entry_set_start_stop_times:
459 * @entry: #GstTocEntry to set values.
460 * @start: start value to set.
461 * @stop: stop value to set.
463 * Set @start and @stop values for the @entry.
466 gst_toc_entry_set_start_stop_times (GstTocEntry * entry, gint64 start,
469 g_return_if_fail (entry != NULL);
471 entry->start = start;
476 * gst_toc_entry_get_start_stop_times:
477 * @entry: #GstTocEntry to get values from.
478 * @start: (out): the storage for the start value, leave #NULL if not need.
479 * @stop: (out): the storage for the stop value, leave #NULL if not need.
481 * Get start and stop values from the @entry and write them into appropriate storages.
483 * Returns: TRUE if all non-NULL storage pointers were filled with appropriate values,
487 gst_toc_entry_get_start_stop_times (const GstTocEntry * entry, gint64 * start,
492 g_return_val_if_fail (entry != NULL, FALSE);
495 *start = entry->start;
503 * gst_toc_entry_type_get_nick:
504 * @type: a #GstTocEntryType.
506 * Converts @type to a string representation.
508 * Returns: Returns a human-readable string for @type. This string is
509 * only for debugging purpose and should not be displayed in a user
513 gst_toc_entry_type_get_nick (GstTocEntryType type)
516 case GST_TOC_ENTRY_TYPE_ANGLE:
518 case GST_TOC_ENTRY_TYPE_VERSION:
520 case GST_TOC_ENTRY_TYPE_EDITION:
522 case GST_TOC_ENTRY_TYPE_TITLE:
524 case GST_TOC_ENTRY_TYPE_TRACK:
526 case GST_TOC_ENTRY_TYPE_CHAPTER:
535 * gst_toc_entry_get_entry_type:
536 * @entry: a #GstTocEntry
538 * Returns: @entry's entry type
541 gst_toc_entry_get_entry_type (const GstTocEntry * entry)
543 g_return_val_if_fail (entry != NULL, GST_TOC_ENTRY_TYPE_INVALID);
549 * gst_toc_entry_is_alternative:
550 * @entry: a #GstTocEntry
552 * Returns: %TRUE if @entry's type is an alternative type, otherwise %FALSE
555 gst_toc_entry_is_alternative (const GstTocEntry * entry)
557 g_return_val_if_fail (entry != NULL, FALSE);
559 return GST_TOC_ENTRY_TYPE_IS_ALTERNATIVE (entry->type);
563 * gst_toc_entry_is_sequence:
564 * @entry: a #GstTocEntry
566 * Returns: %TRUE if @entry's type is a sequence type, otherwise %FALSE
569 gst_toc_entry_is_sequence (const GstTocEntry * entry)
571 g_return_val_if_fail (entry != NULL, FALSE);
573 return GST_TOC_ENTRY_TYPE_IS_SEQUENCE (entry->type);
577 * gst_toc_entry_get_uid:
578 * @entry: A #GstTocEntry instance
580 * Gets the UID of @entry.
582 * Returns: (transfer none): The UID of @entry
585 gst_toc_entry_get_uid (const GstTocEntry * entry)
587 g_return_val_if_fail (entry != NULL, NULL);
593 * gst_toc_entry_append_sub_entry:
594 * @entry: A #GstTocEntry instance
595 * @subentry: (transfer full): A #GstTocEntry
597 * Appends the #GstTocEntry @subentry to @entry.
600 gst_toc_entry_append_sub_entry (GstTocEntry * entry, GstTocEntry * subentry)
602 g_return_if_fail (entry != NULL);
603 g_return_if_fail (subentry != NULL);
604 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
605 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST
607 g_return_if_fail (subentry->toc == NULL);
608 g_return_if_fail (subentry->parent == NULL);
610 entry->subentries = g_list_append (entry->subentries, subentry);
611 subentry->toc = entry->toc;
612 subentry->parent = entry;
614 GST_LOG ("appended %s subentry with uid %s to entry %s",
615 gst_toc_entry_type_get_nick (subentry->type), subentry->uid, entry->uid);
619 * gst_toc_entry_get_uid:
620 * @entry: A #GstTocEntry instance
622 * Gets the sub-entries of @entry.
624 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry of @entry
627 gst_toc_entry_get_sub_entries (const GstTocEntry * entry)
629 g_return_val_if_fail (entry != NULL, NULL);
631 return entry->subentries;
635 * gst_toc_entry_set_tags:
636 * @entry: A #GstTocEntry instance
637 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
639 * Set a #GstTagList with tags for the complete @entry.
642 gst_toc_entry_set_tags (GstTocEntry * entry, GstTagList * tags)
644 g_return_if_fail (entry != NULL);
645 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
648 gst_tag_list_unref (entry->tags);
653 * gst_toc_entry_merge_tags:
654 * @entry: A #GstTocEntry instance
655 * @tags: (allow-none): A #GstTagList or %NULL
656 * @mode: A #GstTagMergeMode
658 * Merge @tags into the existing tags of @entry using @mode.
661 gst_toc_entry_merge_tags (GstTocEntry * entry, GstTagList * tags,
662 GstTagMergeMode mode)
664 g_return_if_fail (entry != NULL);
665 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
668 entry->tags = gst_tag_list_ref (tags);
670 GstTagList *tmp = gst_tag_list_merge (entry->tags, tags, mode);
671 gst_tag_list_unref (entry->tags);
677 * gst_toc_entry_get_tags:
678 * @entry: A #GstTocEntry instance
680 * Gets the tags for @entry.
682 * Returns: (transfer none): A #GstTagList for @entry
685 gst_toc_entry_get_tags (const GstTocEntry * entry)
687 g_return_val_if_fail (entry != NULL, NULL);
693 * gst_toc_entry_get_toc:
694 * @entry: A #GstTocEntry instance
696 * Gets the parent #GstToc of @entry.
698 * Returns: (transfer none): The parent #GstToc of @entry
701 gst_toc_entry_get_toc (GstTocEntry * entry)
703 g_return_val_if_fail (entry != NULL, NULL);
709 * gst_toc_entry_get_parent:
710 * @entry: A #GstTocEntry instance
712 * Gets the parent #GstTocEntry of @entry.
714 * Returns: (transfer none): The parent #GstTocEntry of @entry
717 gst_toc_entry_get_parent (GstTocEntry * entry)
719 g_return_val_if_fail (entry != NULL, NULL);
721 return entry->parent;
724 #ifndef GST_DISABLE_GST_DEBUG
726 gst_toc_dump_entries (GList * entries, guint depth)
731 indent = g_malloc0 (depth + 1);
732 memset (indent, ' ', depth);
733 for (e = entries; e != NULL; e = e->next) {
734 GstTocEntry *entry = e->data;
736 GST_TRACE ("%s+ %s (%s), %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT ", "
737 "tags: %" GST_PTR_FORMAT, indent, entry->uid,
738 gst_toc_entry_type_get_nick (entry->type),
739 GST_TIME_ARGS (entry->start), GST_TIME_ARGS (entry->stop), entry->tags);
741 if (entry->subentries != NULL)
742 gst_toc_dump_entries (entry->subentries, depth + 2);
749 gst_toc_dump (GstToc * toc)
751 #ifndef GST_DISABLE_GST_DEBUG
752 GST_TRACE (" Toc %p, scope: %s, tags: %" GST_PTR_FORMAT, toc,
753 (toc->scope == GST_TOC_SCOPE_GLOBAL) ? "global" : "current", toc->tags);
754 gst_toc_dump_entries (toc->entries, 2);