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): #GstTocEntry with specified @uid from the @toc, or %NULL if not found.
366 gst_toc_find_entry (const GstToc * toc, const gchar * uid)
369 GstTocEntry *entry, *subentry;
371 g_return_val_if_fail (toc != NULL, NULL);
372 g_return_val_if_fail (uid != NULL, NULL);
375 while (cur != NULL) {
378 if (g_strcmp0 (entry->uid, uid) == 0)
381 subentry = gst_toc_entry_find_sub_entry (entry, uid);
382 if (subentry != NULL)
391 * gst_toc_entry_copy:
392 * @entry: #GstTocEntry to copy.
394 * Copy #GstTocEntry with all subentries (deep copy).
396 * Returns: newly allocated #GstTocEntry in case of success, %NULL otherwise;
397 * free it when done with gst_toc_entry_unref().
400 gst_toc_entry_copy (const GstTocEntry * entry)
402 GstTocEntry *ret, *sub;
406 g_return_val_if_fail (entry != NULL, NULL);
408 ret = gst_toc_entry_new (entry->type, entry->uid);
410 ret->start = entry->start;
411 ret->stop = entry->stop;
413 if (GST_IS_TAG_LIST (entry->tags)) {
414 list = gst_tag_list_copy (entry->tags);
416 gst_tag_list_unref (ret->tags);
420 cur = entry->subentries;
421 while (cur != NULL) {
422 sub = gst_toc_entry_copy (cur->data);
425 ret->subentries = g_list_prepend (ret->subentries, sub);
429 ret->subentries = g_list_reverse (ret->subentries);
436 * @toc: #GstToc to copy.
438 * Copy #GstToc with all subentries (deep copy).
440 * Returns: newly allocated #GstToc in case of success, %NULL otherwise;
441 * free it when done with gst_toc_unref().
444 gst_toc_copy (const GstToc * toc)
451 g_return_val_if_fail (toc != NULL, NULL);
453 ret = gst_toc_new (toc->scope);
455 if (GST_IS_TAG_LIST (toc->tags)) {
456 list = gst_tag_list_copy (toc->tags);
457 gst_tag_list_unref (ret->tags);
462 while (cur != NULL) {
463 entry = gst_toc_entry_copy (cur->data);
466 ret->entries = g_list_prepend (ret->entries, entry);
470 ret->entries = g_list_reverse (ret->entries);
475 * gst_toc_entry_set_start_stop_times:
476 * @entry: #GstTocEntry to set values.
477 * @start: start value to set.
478 * @stop: stop value to set.
480 * Set @start and @stop values for the @entry.
483 gst_toc_entry_set_start_stop_times (GstTocEntry * entry, gint64 start,
486 g_return_if_fail (entry != NULL);
488 entry->start = start;
493 * gst_toc_entry_get_start_stop_times:
494 * @entry: #GstTocEntry to get values from.
495 * @start: (out): the storage for the start value, leave %NULL if not need.
496 * @stop: (out): the storage for the stop value, leave %NULL if not need.
498 * Get @start and @stop values from the @entry and write them into appropriate
501 * Returns: %TRUE if all non-%NULL storage pointers were filled with appropriate
502 * values, %FALSE otherwise.
505 gst_toc_entry_get_start_stop_times (const GstTocEntry * entry, gint64 * start,
508 g_return_val_if_fail (entry != NULL, FALSE);
511 *start = entry->start;
519 * gst_toc_entry_set_loop:
520 * @entry: #GstTocEntry to set values.
521 * @loop_type: loop_type value to set.
522 * @repeat_count: repeat_count value to set.
524 * Set @loop_type and @repeat_count values for the @entry.
529 gst_toc_entry_set_loop (GstTocEntry * entry, GstTocLoopType loop_type,
532 g_return_if_fail (entry != NULL);
534 entry->loop_type = loop_type;
535 entry->repeat_count = repeat_count;
539 * gst_toc_entry_get_loop:
540 * @entry: #GstTocEntry to get values from.
541 * @loop_type: (out): the storage for the loop_type value, leave %NULL if not
543 * @repeat_count: (out): the storage for the repeat_count value, leave %NULL if
546 * Get @loop_type and @repeat_count values from the @entry and write them into
547 * appropriate storages. Loops are e.g. used by sampled instruments. GStreamer
548 * is not automatically applying the loop. The application can process this
549 * meta data and use it e.g. to send a seek-event to loop a section.
551 * Returns: %TRUE if all non-%NULL storage pointers were filled with appropriate
552 * values, %FALSE otherwise.
557 gst_toc_entry_get_loop (const GstTocEntry * entry, GstTocLoopType * loop_type,
560 g_return_val_if_fail (entry != NULL, FALSE);
562 if (loop_type != NULL)
563 *loop_type = entry->loop_type;
564 if (repeat_count != NULL)
565 *repeat_count = entry->repeat_count;
572 * gst_toc_entry_type_get_nick:
573 * @type: a #GstTocEntryType.
575 * Converts @type to a string representation.
577 * Returns: Returns a human-readable string for @type. This string is
578 * only for debugging purpose and should not be displayed in a user
582 gst_toc_entry_type_get_nick (GstTocEntryType type)
585 case GST_TOC_ENTRY_TYPE_ANGLE:
587 case GST_TOC_ENTRY_TYPE_VERSION:
589 case GST_TOC_ENTRY_TYPE_EDITION:
591 case GST_TOC_ENTRY_TYPE_TITLE:
593 case GST_TOC_ENTRY_TYPE_TRACK:
595 case GST_TOC_ENTRY_TYPE_CHAPTER:
604 * gst_toc_entry_get_entry_type:
605 * @entry: a #GstTocEntry
607 * Returns: @entry's entry type
610 gst_toc_entry_get_entry_type (const GstTocEntry * entry)
612 g_return_val_if_fail (entry != NULL, GST_TOC_ENTRY_TYPE_INVALID);
618 * gst_toc_entry_is_alternative:
619 * @entry: a #GstTocEntry
621 * Returns: %TRUE if @entry's type is an alternative type, otherwise %FALSE
624 gst_toc_entry_is_alternative (const GstTocEntry * entry)
626 g_return_val_if_fail (entry != NULL, FALSE);
628 return GST_TOC_ENTRY_TYPE_IS_ALTERNATIVE (entry->type);
632 * gst_toc_entry_is_sequence:
633 * @entry: a #GstTocEntry
635 * Returns: %TRUE if @entry's type is a sequence type, otherwise %FALSE
638 gst_toc_entry_is_sequence (const GstTocEntry * entry)
640 g_return_val_if_fail (entry != NULL, FALSE);
642 return GST_TOC_ENTRY_TYPE_IS_SEQUENCE (entry->type);
646 * gst_toc_entry_get_uid:
647 * @entry: A #GstTocEntry instance
649 * Gets the UID of @entry.
651 * Returns: (transfer none): The UID of @entry
654 gst_toc_entry_get_uid (const GstTocEntry * entry)
656 g_return_val_if_fail (entry != NULL, NULL);
662 * gst_toc_entry_append_sub_entry:
663 * @entry: A #GstTocEntry instance
664 * @subentry: (transfer full): A #GstTocEntry
666 * Appends the #GstTocEntry @subentry to @entry.
669 gst_toc_entry_append_sub_entry (GstTocEntry * entry, GstTocEntry * subentry)
671 g_return_if_fail (entry != NULL);
672 g_return_if_fail (subentry != NULL);
673 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
674 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST
676 g_return_if_fail (subentry->toc == NULL);
677 g_return_if_fail (subentry->parent == NULL);
679 entry->subentries = g_list_append (entry->subentries, subentry);
680 subentry->toc = entry->toc;
681 subentry->parent = entry;
683 GST_LOG ("appended %s subentry with uid %s to entry %s",
684 gst_toc_entry_type_get_nick (subentry->type), subentry->uid, entry->uid);
688 * gst_toc_entry_get_sub_entries:
689 * @entry: A #GstTocEntry instance
691 * Gets the sub-entries of @entry.
693 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry of @entry
696 gst_toc_entry_get_sub_entries (const GstTocEntry * entry)
698 g_return_val_if_fail (entry != NULL, NULL);
700 return entry->subentries;
704 * gst_toc_entry_set_tags:
705 * @entry: A #GstTocEntry instance
706 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
708 * Set a #GstTagList with tags for the complete @entry.
711 gst_toc_entry_set_tags (GstTocEntry * entry, GstTagList * tags)
713 g_return_if_fail (entry != NULL);
714 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
717 gst_tag_list_unref (entry->tags);
722 * gst_toc_entry_merge_tags:
723 * @entry: A #GstTocEntry instance
724 * @tags: (allow-none): A #GstTagList or %NULL
725 * @mode: A #GstTagMergeMode
727 * Merge @tags into the existing tags of @entry using @mode.
730 gst_toc_entry_merge_tags (GstTocEntry * entry, GstTagList * tags,
731 GstTagMergeMode mode)
733 g_return_if_fail (entry != NULL);
734 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
737 entry->tags = gst_tag_list_ref (tags);
739 GstTagList *tmp = gst_tag_list_merge (entry->tags, tags, mode);
740 gst_tag_list_unref (entry->tags);
746 * gst_toc_entry_get_tags:
747 * @entry: A #GstTocEntry instance
749 * Gets the tags for @entry.
751 * Returns: (transfer none): A #GstTagList for @entry
754 gst_toc_entry_get_tags (const GstTocEntry * entry)
756 g_return_val_if_fail (entry != NULL, NULL);
762 * gst_toc_entry_get_toc:
763 * @entry: A #GstTocEntry instance
765 * Gets the parent #GstToc of @entry.
767 * Returns: (transfer none): The parent #GstToc of @entry
770 gst_toc_entry_get_toc (GstTocEntry * entry)
772 g_return_val_if_fail (entry != NULL, NULL);
778 * gst_toc_entry_get_parent:
779 * @entry: A #GstTocEntry instance
781 * Gets the parent #GstTocEntry of @entry.
783 * Returns: (transfer none): The parent #GstTocEntry of @entry
786 gst_toc_entry_get_parent (GstTocEntry * entry)
788 g_return_val_if_fail (entry != NULL, NULL);
790 return entry->parent;
793 #ifndef GST_DISABLE_GST_DEBUG
795 gst_toc_dump_entries (GList * entries, guint depth)
800 indent = g_malloc0 (depth + 1);
801 memset (indent, ' ', depth);
802 for (e = entries; e != NULL; e = e->next) {
803 GstTocEntry *entry = e->data;
805 GST_TRACE ("%s+ %s (%s), %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT ", "
806 "tags: %" GST_PTR_FORMAT, indent, entry->uid,
807 gst_toc_entry_type_get_nick (entry->type),
808 GST_TIME_ARGS (entry->start), GST_TIME_ARGS (entry->stop), entry->tags);
810 if (entry->subentries != NULL)
811 gst_toc_dump_entries (entry->subentries, depth + 2);
818 gst_toc_dump (GstToc * toc)
820 #ifndef GST_DISABLE_GST_DEBUG
821 GST_TRACE (" Toc %p, scope: %s, tags: %" GST_PTR_FORMAT, toc,
822 (toc->scope == GST_TOC_SCOPE_GLOBAL) ? "global" : "current", toc->tags);
823 gst_toc_dump_entries (toc->entries, 2);
828 _priv_gst_toc_initialize (void)
830 _gst_toc_type = gst_toc_get_type ();
831 _gst_toc_entry_type = gst_toc_entry_get_type ();