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., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, 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 the #GstToc using
39 * gst_toc_append_entry(), and appending subentries to a #GstTocEntry using
40 * gst_toc_entry_append_sub_entry().
42 * Note that root level of the TOC can contain only either editions or chapters. You
43 * should not mix them together at the same level. Otherwise you will get serialization
44 * /deserialization errors. Make sure that no one of the entries has negative start and
47 * Use gst_event_new_toc() to create a new TOC #GstEvent, and gst_event_parse_toc() to
48 * parse received TOC event. Use gst_event_new_toc_select() to create a new TOC select #GstEvent,
49 * and gst_event_parse_toc_select() to parse received TOC select event. The same rule for
50 * the #GstMessage: gst_message_new_toc() to create new TOC #GstMessage, and
51 * gst_message_parse_toc() to parse received TOC message.
53 * TOCs can have global scope or current scope. Global scope TOCs contain
54 * all entries that can possibly be selected using a toc select event, and
55 * are what an application is usually interested in. TOCs with current scope
56 * only contain the parts of the TOC relevant to the currently selected/playing
57 * stream; the current scope TOC is used by downstream elements such as muxers
58 * to write correct TOC entries when transcoding files, for example. When
59 * playing a DVD, the global TOC would contain a hierarchy of all titles,
60 * chapters and angles, for example, while the current TOC would only contain
61 * the chapters for the currently playing title if playback of a specific
62 * title was requested.
64 * Applications and plugins should not rely on TOCs having a certain kind of
65 * structure, but should allow for different alternatives. For example, a
66 * simple CUE sheet embedded in a file may be presented as a flat list of
67 * track entries, or could have a top-level edition node (or some other
68 * alternative type entry) with track entries underneath that node; or even
69 * multiple top-level edition nodes (or some other alternative type entries)
70 * each with track entries underneath, in case the source file has extracted
71 * a track listing from different sources).
78 #include "gst_private.h"
79 #include "gstenumtypes.h"
80 #include "gsttaglist.h"
81 #include "gststructure.h"
89 GstMiniObject mini_object;
96 GstClockTime start, stop;
99 GstTocLoopType loop_type;
105 GstMiniObject mini_object;
113 static GstToc *gst_toc_copy (const GstToc * toc);
114 static void gst_toc_free (GstToc * toc);
115 #undef gst_toc_entry_copy
116 static GstTocEntry *gst_toc_entry_copy (const GstTocEntry * toc);
117 static void gst_toc_entry_free (GstTocEntry * toc);
119 GType _gst_toc_type = 0;
120 GType _gst_toc_entry_type = 0;
122 GST_DEFINE_MINI_OBJECT_TYPE (GstToc, gst_toc);
123 GST_DEFINE_MINI_OBJECT_TYPE (GstTocEntry, gst_toc_entry);
127 * @scope: scope of this TOC
129 * Create a new #GstToc structure.
131 * Returns: (transfer full): newly allocated #GstToc structure, free it
132 * with gst_toc_unref().
135 gst_toc_new (GstTocScope scope)
139 g_return_val_if_fail (scope == GST_TOC_SCOPE_GLOBAL ||
140 scope == GST_TOC_SCOPE_CURRENT, NULL);
142 toc = g_slice_new0 (GstToc);
144 gst_mini_object_init (GST_MINI_OBJECT_CAST (toc), 0, GST_TYPE_TOC,
145 (GstMiniObjectCopyFunction) gst_toc_copy, NULL,
146 (GstMiniObjectFreeFunction) gst_toc_free);
149 toc->tags = gst_tag_list_new_empty ();
156 * @toc: a #GstToc instance
158 * Returns: scope of @toc
161 gst_toc_get_scope (const GstToc * toc)
163 g_return_val_if_fail (toc != NULL, GST_TOC_SCOPE_GLOBAL);
170 * @toc: A #GstToc instance
171 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
173 * Set a #GstTagList with tags for the complete @toc.
176 gst_toc_set_tags (GstToc * toc, GstTagList * tags)
178 g_return_if_fail (toc != NULL);
179 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
182 gst_tag_list_unref (toc->tags);
187 * gst_toc_merge_tags:
188 * @toc: A #GstToc instance
189 * @tags: (allow-none): A #GstTagList or %NULL
190 * @mode: A #GstTagMergeMode
192 * Merge @tags into the existing tags of @toc using @mode.
195 gst_toc_merge_tags (GstToc * toc, GstTagList * tags, GstTagMergeMode mode)
197 g_return_if_fail (toc != NULL);
198 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
201 toc->tags = gst_tag_list_ref (tags);
203 GstTagList *tmp = gst_tag_list_merge (toc->tags, tags, mode);
204 gst_tag_list_unref (toc->tags);
211 * @toc: A #GstToc instance
213 * Gets the tags for @toc.
215 * Returns: (transfer none): A #GstTagList for @entry
218 gst_toc_get_tags (const GstToc * toc)
220 g_return_val_if_fail (toc != NULL, NULL);
226 * gst_toc_append_entry:
227 * @toc: A #GstToc instance
228 * @entry: (transfer full): A #GstTocEntry
230 * Appends the #GstTocEntry @entry to @toc.
233 gst_toc_append_entry (GstToc * toc, GstTocEntry * entry)
235 g_return_if_fail (toc != NULL);
236 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
237 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
238 g_return_if_fail (entry->toc == NULL);
239 g_return_if_fail (entry->parent == NULL);
241 toc->entries = g_list_append (toc->entries, entry);
244 GST_LOG ("appended %s entry with uid %s to toc %p",
245 gst_toc_entry_type_get_nick (entry->type), entry->uid, toc);
251 * gst_toc_get_entries:
252 * @toc: A #GstToc instance
254 * Gets the list of #GstTocEntry of @toc.
256 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry for @entry
259 gst_toc_get_entries (const GstToc * toc)
261 g_return_val_if_fail (toc != NULL, NULL);
267 gst_toc_entry_new_internal (GstTocEntryType type, const gchar * uid)
271 entry = g_slice_new0 (GstTocEntry);
273 gst_mini_object_init (GST_MINI_OBJECT_CAST (entry), 0, GST_TYPE_TOC_ENTRY,
274 (GstMiniObjectCopyFunction) gst_toc_entry_copy, NULL,
275 (GstMiniObjectFreeFunction) gst_toc_entry_free);
277 entry->uid = g_strdup (uid);
280 entry->start = entry->stop = GST_CLOCK_TIME_NONE;
288 * @uid: unique ID (UID) in the whole TOC.
290 * Create new #GstTocEntry structure.
292 * Returns: newly allocated #GstTocEntry structure, free it with gst_toc_entry_unref().
295 gst_toc_entry_new (GstTocEntryType type, const gchar * uid)
297 g_return_val_if_fail (uid != NULL, NULL);
299 return gst_toc_entry_new_internal (type, uid);
303 gst_toc_free (GstToc * toc)
305 g_list_foreach (toc->entries, (GFunc) gst_mini_object_unref, NULL);
306 g_list_free (toc->entries);
308 if (toc->tags != NULL)
309 gst_tag_list_unref (toc->tags);
311 g_slice_free (GstToc, toc);
315 gst_toc_entry_free (GstTocEntry * entry)
317 g_return_if_fail (entry != NULL);
319 g_list_foreach (entry->subentries, (GFunc) gst_mini_object_unref, NULL);
320 g_list_free (entry->subentries);
324 if (entry->tags != NULL)
325 gst_tag_list_unref (entry->tags);
327 g_slice_free (GstTocEntry, entry);
331 gst_toc_entry_find_sub_entry (const GstTocEntry * entry, const gchar * uid)
334 GstTocEntry *subentry, *subsubentry;
336 g_return_val_if_fail (entry != NULL, NULL);
337 g_return_val_if_fail (uid != NULL, NULL);
339 cur = entry->subentries;
340 while (cur != NULL) {
341 subentry = cur->data;
343 if (g_strcmp0 (subentry->uid, uid) == 0)
346 subsubentry = gst_toc_entry_find_sub_entry (subentry, uid);
347 if (subsubentry != NULL)
357 * gst_toc_find_entry:
358 * @toc: #GstToc to search in.
359 * @uid: UID to find #GstTocEntry with.
361 * Find #GstTocEntry with given @uid in the @toc.
363 * Returns: (transfer none) (nullable): #GstTocEntry with specified
364 * @uid from the @toc, or %NULL if not found.
367 gst_toc_find_entry (const GstToc * toc, const gchar * uid)
370 GstTocEntry *entry, *subentry;
372 g_return_val_if_fail (toc != NULL, NULL);
373 g_return_val_if_fail (uid != NULL, NULL);
376 while (cur != NULL) {
379 if (g_strcmp0 (entry->uid, uid) == 0)
382 subentry = gst_toc_entry_find_sub_entry (entry, uid);
383 if (subentry != NULL)
392 gst_toc_deep_copy_toc_entries (GList * entry_list)
394 GQueue new_entries = G_QUEUE_INIT;
397 for (l = entry_list; l != NULL; l = l->next)
398 g_queue_push_tail (&new_entries, gst_toc_entry_copy (l->data));
400 return new_entries.head;
404 * gst_toc_entry_copy:
405 * @entry: #GstTocEntry to copy.
407 * Copy #GstTocEntry with all subentries (deep copy).
409 * Returns: (nullable): newly allocated #GstTocEntry in case of
410 * success, %NULL otherwise; free it when done with
411 * gst_toc_entry_unref().
414 gst_toc_entry_copy (const GstTocEntry * entry)
419 g_return_val_if_fail (entry != NULL, NULL);
421 ret = gst_toc_entry_new (entry->type, entry->uid);
423 ret->start = entry->start;
424 ret->stop = entry->stop;
426 if (GST_IS_TAG_LIST (entry->tags)) {
427 list = gst_tag_list_copy (entry->tags);
429 gst_tag_list_unref (ret->tags);
433 ret->subentries = gst_toc_deep_copy_toc_entries (entry->subentries);
440 * @toc: #GstToc to copy.
442 * Copy #GstToc with all subentries (deep copy).
444 * Returns: (nullable): newly allocated #GstToc in case of success,
445 * %NULL otherwise; free it when done with gst_toc_unref().
448 gst_toc_copy (const GstToc * toc)
453 g_return_val_if_fail (toc != NULL, NULL);
455 ret = gst_toc_new (toc->scope);
457 if (GST_IS_TAG_LIST (toc->tags)) {
458 list = gst_tag_list_copy (toc->tags);
459 gst_tag_list_unref (ret->tags);
463 ret->entries = gst_toc_deep_copy_toc_entries (toc->entries);
469 * gst_toc_entry_set_start_stop_times:
470 * @entry: #GstTocEntry to set values.
471 * @start: start value to set.
472 * @stop: stop value to set.
474 * Set @start and @stop values for the @entry.
477 gst_toc_entry_set_start_stop_times (GstTocEntry * entry, gint64 start,
480 g_return_if_fail (entry != NULL);
482 entry->start = start;
487 * gst_toc_entry_get_start_stop_times:
488 * @entry: #GstTocEntry to get values from.
489 * @start: (out) (allow-none): the storage for the start value, leave
491 * @stop: (out) (allow-none): the storage for the stop value, leave
494 * Get @start and @stop values from the @entry and write them into appropriate
497 * Returns: %TRUE if all non-%NULL storage pointers were filled with appropriate
498 * values, %FALSE otherwise.
501 gst_toc_entry_get_start_stop_times (const GstTocEntry * entry, gint64 * start,
504 g_return_val_if_fail (entry != NULL, FALSE);
507 *start = entry->start;
515 * gst_toc_entry_set_loop:
516 * @entry: #GstTocEntry to set values.
517 * @loop_type: loop_type value to set.
518 * @repeat_count: repeat_count value to set.
520 * Set @loop_type and @repeat_count values for the @entry.
525 gst_toc_entry_set_loop (GstTocEntry * entry, GstTocLoopType loop_type,
528 g_return_if_fail (entry != NULL);
530 entry->loop_type = loop_type;
531 entry->repeat_count = repeat_count;
535 * gst_toc_entry_get_loop:
536 * @entry: #GstTocEntry to get values from.
537 * @loop_type: (out) (allow-none): the storage for the loop_type
538 * value, leave %NULL if not need.
539 * @repeat_count: (out) (allow-none): the storage for the repeat_count
540 * value, leave %NULL if not need.
542 * Get @loop_type and @repeat_count values from the @entry and write them into
543 * appropriate storages. Loops are e.g. used by sampled instruments. GStreamer
544 * is not automatically applying the loop. The application can process this
545 * meta data and use it e.g. to send a seek-event to loop a section.
547 * Returns: %TRUE if all non-%NULL storage pointers were filled with appropriate
548 * values, %FALSE otherwise.
553 gst_toc_entry_get_loop (const GstTocEntry * entry, GstTocLoopType * loop_type,
556 g_return_val_if_fail (entry != NULL, FALSE);
558 if (loop_type != NULL)
559 *loop_type = entry->loop_type;
560 if (repeat_count != NULL)
561 *repeat_count = entry->repeat_count;
568 * gst_toc_entry_type_get_nick:
569 * @type: a #GstTocEntryType.
571 * Converts @type to a string representation.
573 * Returns: Returns a human-readable string for @type. This string is
574 * only for debugging purpose and should not be displayed in a user
578 gst_toc_entry_type_get_nick (GstTocEntryType type)
581 case GST_TOC_ENTRY_TYPE_ANGLE:
583 case GST_TOC_ENTRY_TYPE_VERSION:
585 case GST_TOC_ENTRY_TYPE_EDITION:
587 case GST_TOC_ENTRY_TYPE_TITLE:
589 case GST_TOC_ENTRY_TYPE_TRACK:
591 case GST_TOC_ENTRY_TYPE_CHAPTER:
600 * gst_toc_entry_get_entry_type:
601 * @entry: a #GstTocEntry
603 * Returns: @entry's entry type
606 gst_toc_entry_get_entry_type (const GstTocEntry * entry)
608 g_return_val_if_fail (entry != NULL, GST_TOC_ENTRY_TYPE_INVALID);
614 * gst_toc_entry_is_alternative:
615 * @entry: a #GstTocEntry
617 * Returns: %TRUE if @entry's type is an alternative type, otherwise %FALSE
620 gst_toc_entry_is_alternative (const GstTocEntry * entry)
622 g_return_val_if_fail (entry != NULL, FALSE);
624 return GST_TOC_ENTRY_TYPE_IS_ALTERNATIVE (entry->type);
628 * gst_toc_entry_is_sequence:
629 * @entry: a #GstTocEntry
631 * Returns: %TRUE if @entry's type is a sequence type, otherwise %FALSE
634 gst_toc_entry_is_sequence (const GstTocEntry * entry)
636 g_return_val_if_fail (entry != NULL, FALSE);
638 return GST_TOC_ENTRY_TYPE_IS_SEQUENCE (entry->type);
642 * gst_toc_entry_get_uid:
643 * @entry: A #GstTocEntry instance
645 * Gets the UID of @entry.
647 * Returns: (transfer none): The UID of @entry
650 gst_toc_entry_get_uid (const GstTocEntry * entry)
652 g_return_val_if_fail (entry != NULL, NULL);
658 * gst_toc_entry_append_sub_entry:
659 * @entry: A #GstTocEntry instance
660 * @subentry: (transfer full): A #GstTocEntry
662 * Appends the #GstTocEntry @subentry to @entry.
665 gst_toc_entry_append_sub_entry (GstTocEntry * entry, GstTocEntry * subentry)
667 g_return_if_fail (entry != NULL);
668 g_return_if_fail (subentry != NULL);
669 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
670 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST
672 g_return_if_fail (subentry->toc == NULL);
673 g_return_if_fail (subentry->parent == NULL);
675 entry->subentries = g_list_append (entry->subentries, subentry);
676 subentry->toc = entry->toc;
677 subentry->parent = entry;
679 GST_LOG ("appended %s subentry with uid %s to entry %s",
680 gst_toc_entry_type_get_nick (subentry->type), subentry->uid, entry->uid);
684 * gst_toc_entry_get_sub_entries:
685 * @entry: A #GstTocEntry instance
687 * Gets the sub-entries of @entry.
689 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry of @entry
692 gst_toc_entry_get_sub_entries (const GstTocEntry * entry)
694 g_return_val_if_fail (entry != NULL, NULL);
696 return entry->subentries;
700 * gst_toc_entry_set_tags:
701 * @entry: A #GstTocEntry instance
702 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
704 * Set a #GstTagList with tags for the complete @entry.
707 gst_toc_entry_set_tags (GstTocEntry * entry, GstTagList * tags)
709 g_return_if_fail (entry != NULL);
710 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
713 gst_tag_list_unref (entry->tags);
718 * gst_toc_entry_merge_tags:
719 * @entry: A #GstTocEntry instance
720 * @tags: (allow-none): A #GstTagList or %NULL
721 * @mode: A #GstTagMergeMode
723 * Merge @tags into the existing tags of @entry using @mode.
726 gst_toc_entry_merge_tags (GstTocEntry * entry, GstTagList * tags,
727 GstTagMergeMode mode)
729 g_return_if_fail (entry != NULL);
730 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
733 entry->tags = gst_tag_list_ref (tags);
735 GstTagList *tmp = gst_tag_list_merge (entry->tags, tags, mode);
736 gst_tag_list_unref (entry->tags);
742 * gst_toc_entry_get_tags:
743 * @entry: A #GstTocEntry instance
745 * Gets the tags for @entry.
747 * Returns: (transfer none): A #GstTagList for @entry
750 gst_toc_entry_get_tags (const GstTocEntry * entry)
752 g_return_val_if_fail (entry != NULL, NULL);
758 * gst_toc_entry_get_toc:
759 * @entry: A #GstTocEntry instance
761 * Gets the parent #GstToc of @entry.
763 * Returns: (transfer none): The parent #GstToc of @entry
766 gst_toc_entry_get_toc (GstTocEntry * entry)
768 g_return_val_if_fail (entry != NULL, NULL);
774 * gst_toc_entry_get_parent:
775 * @entry: A #GstTocEntry instance
777 * Gets the parent #GstTocEntry of @entry.
779 * Returns: (transfer none): The parent #GstTocEntry of @entry
782 gst_toc_entry_get_parent (GstTocEntry * entry)
784 g_return_val_if_fail (entry != NULL, NULL);
786 return entry->parent;
789 #ifndef GST_DISABLE_GST_DEBUG
791 gst_toc_dump_entries (GList * entries, guint depth)
796 indent = g_malloc0 (depth + 1);
797 memset (indent, ' ', depth);
798 for (e = entries; e != NULL; e = e->next) {
799 GstTocEntry *entry = e->data;
801 GST_TRACE ("%s+ %s (%s), %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT ", "
802 "tags: %" GST_PTR_FORMAT, indent, entry->uid,
803 gst_toc_entry_type_get_nick (entry->type),
804 GST_TIME_ARGS (entry->start), GST_TIME_ARGS (entry->stop), entry->tags);
806 if (entry->subentries != NULL)
807 gst_toc_dump_entries (entry->subentries, depth + 2);
814 gst_toc_dump (GstToc * toc)
816 #ifndef GST_DISABLE_GST_DEBUG
817 GST_TRACE (" Toc %p, scope: %s, tags: %" GST_PTR_FORMAT, toc,
818 (toc->scope == GST_TOC_SCOPE_GLOBAL) ? "global" : "current", toc->tags);
819 gst_toc_dump_entries (toc->entries, 2);
824 _priv_gst_toc_initialize (void)
826 _gst_toc_type = gst_toc_get_type ();
827 _gst_toc_entry_type = gst_toc_entry_get_type ();