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;
98 static GstToc *gst_toc_copy (const GstToc * toc);
99 static void gst_toc_free (GstToc * toc);
100 #undef gst_toc_entry_copy
101 static GstTocEntry *gst_toc_entry_copy (const GstTocEntry * toc);
102 static void gst_toc_entry_free (GstTocEntry * toc);
104 GST_DEFINE_MINI_OBJECT_TYPE (GstToc, gst_toc);
105 GST_DEFINE_MINI_OBJECT_TYPE (GstTocEntry, gst_toc_entry);
110 * Create a new #GstToc structure.
112 * Returns: (transfer full): newly allocated #GstToc structure, free it
113 * with gst_toc_unref().
120 toc = g_slice_new0 (GstToc);
122 gst_mini_object_init (GST_MINI_OBJECT_CAST (toc), 0, GST_TYPE_TOC,
123 (GstMiniObjectCopyFunction) gst_toc_copy, NULL,
124 (GstMiniObjectFreeFunction) gst_toc_free);
126 toc->tags = gst_tag_list_new_empty ();
133 * @toc: A #GstToc instance
134 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
136 * Set a #GstTagList with tags for the complete @toc.
139 gst_toc_set_tags (GstToc * toc, GstTagList * tags)
141 g_return_if_fail (toc != NULL);
142 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
145 gst_tag_list_unref (toc->tags);
150 * gst_toc_merge_tags:
151 * @toc: A #GstToc instance
152 * @tags: (allow-none): A #GstTagList or %NULL
153 * @mode: A #GstTagMergeMode
155 * Merge @tags into the existing tags of @toc using @mode.
158 gst_toc_merge_tags (GstToc * toc, GstTagList * tags, GstTagMergeMode mode)
160 g_return_if_fail (toc != NULL);
161 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
164 toc->tags = gst_tag_list_ref (tags);
166 GstTagList *tmp = gst_tag_list_merge (toc->tags, tags, mode);
167 gst_tag_list_unref (toc->tags);
174 * @toc: A #GstToc instance
176 * Gets the tags for @toc.
178 * Returns: (transfer none): A #GstTagList for @entry
181 gst_toc_get_tags (const GstToc * toc)
183 g_return_val_if_fail (toc != NULL, NULL);
189 * gst_toc_append_entry:
190 * @toc: A #GstToc instance
191 * @entry: (transfer full): A #GstTocEntry
193 * Appends the #GstTocEntry @entry to @toc.
196 gst_toc_append_entry (GstToc * toc, GstTocEntry * entry)
198 g_return_if_fail (toc != NULL);
199 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
200 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
201 g_return_if_fail (entry->toc == NULL);
202 g_return_if_fail (entry->parent == NULL);
204 toc->entries = g_list_append (toc->entries, entry);
207 GST_LOG ("appended %s entry with uid %s to toc %p",
208 gst_toc_entry_type_get_nick (entry->type), entry->uid, toc);
214 * gst_toc_get_entries:
215 * @toc: A #GstToc instance
217 * Gets the list of #GstTocEntry of @toc.
219 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry for @entry
222 gst_toc_get_entries (const GstToc * toc)
224 g_return_val_if_fail (toc != NULL, NULL);
230 gst_toc_entry_new_internal (GstTocEntryType type, const gchar * uid)
234 entry = g_slice_new0 (GstTocEntry);
236 gst_mini_object_init (GST_MINI_OBJECT_CAST (entry), 0, GST_TYPE_TOC_ENTRY,
237 (GstMiniObjectCopyFunction) gst_toc_entry_copy, NULL,
238 (GstMiniObjectFreeFunction) gst_toc_entry_free);
240 entry->uid = g_strdup (uid);
243 entry->start = entry->stop = GST_CLOCK_TIME_NONE;
251 * @uid: unique ID (UID) in the whole TOC.
253 * Create new #GstTocEntry structure.
255 * Returns: newly allocated #GstTocEntry structure, free it with gst_toc_entry_unref().
258 gst_toc_entry_new (GstTocEntryType type, const gchar * uid)
260 g_return_val_if_fail (uid != NULL, NULL);
262 return gst_toc_entry_new_internal (type, uid);
266 gst_toc_free (GstToc * toc)
268 g_list_foreach (toc->entries, (GFunc) gst_mini_object_unref, NULL);
269 g_list_free (toc->entries);
271 if (toc->tags != NULL)
272 gst_tag_list_unref (toc->tags);
274 g_slice_free (GstToc, toc);
278 gst_toc_entry_free (GstTocEntry * entry)
280 g_return_if_fail (entry != NULL);
282 g_list_foreach (entry->subentries, (GFunc) gst_mini_object_unref, NULL);
283 g_list_free (entry->subentries);
287 if (entry->tags != NULL)
288 gst_tag_list_unref (entry->tags);
290 g_slice_free (GstTocEntry, entry);
294 gst_toc_entry_find_sub_entry (const GstTocEntry * entry, const gchar * uid)
297 GstTocEntry *subentry, *subsubentry;
299 g_return_val_if_fail (entry != NULL, NULL);
300 g_return_val_if_fail (uid != NULL, NULL);
302 cur = entry->subentries;
303 while (cur != NULL) {
304 subentry = cur->data;
306 if (g_strcmp0 (subentry->uid, uid) == 0)
309 subsubentry = gst_toc_entry_find_sub_entry (subentry, uid);
310 if (subsubentry != NULL)
320 * gst_toc_find_entry:
321 * @toc: #GstToc to search in.
322 * @uid: UID to find #GstTocEntry with.
324 * Find #GstTocEntry with given @uid in the @toc.
326 * Returns: (transfer none): #GstTocEntry with specified @uid from the @toc, or NULL if not found.
329 gst_toc_find_entry (const GstToc * toc, const gchar * uid)
332 GstTocEntry *entry, *subentry;
334 g_return_val_if_fail (toc != NULL, NULL);
335 g_return_val_if_fail (uid != NULL, NULL);
338 while (cur != NULL) {
341 if (g_strcmp0 (entry->uid, uid) == 0)
344 subentry = gst_toc_entry_find_sub_entry (entry, uid);
345 if (subentry != NULL)
354 * gst_toc_entry_copy:
355 * @entry: #GstTocEntry to copy.
357 * Copy #GstTocEntry with all subentries (deep copy).
359 * Returns: newly allocated #GstTocEntry in case of success, NULL otherwise;
360 * free it when done with gst_toc_entry_unref().
363 gst_toc_entry_copy (const GstTocEntry * entry)
365 GstTocEntry *ret, *sub;
369 g_return_val_if_fail (entry != NULL, NULL);
371 ret = gst_toc_entry_new (entry->type, entry->uid);
373 ret->start = entry->start;
374 ret->stop = entry->stop;
376 if (GST_IS_TAG_LIST (entry->tags)) {
377 list = gst_tag_list_copy (entry->tags);
379 gst_tag_list_unref (ret->tags);
383 cur = entry->subentries;
384 while (cur != NULL) {
385 sub = gst_toc_entry_copy (cur->data);
388 ret->subentries = g_list_prepend (ret->subentries, sub);
392 ret->subentries = g_list_reverse (ret->subentries);
399 * @toc: #GstToc to copy.
401 * Copy #GstToc with all subentries (deep copy).
403 * Returns: newly allocated #GstToc in case of success, NULL otherwise;
404 * free it when done with gst_toc_free().
407 gst_toc_copy (const GstToc * toc)
414 g_return_val_if_fail (toc != NULL, NULL);
416 ret = gst_toc_new ();
418 if (GST_IS_TAG_LIST (toc->tags)) {
419 list = gst_tag_list_copy (toc->tags);
420 gst_tag_list_unref (ret->tags);
425 while (cur != NULL) {
426 entry = gst_toc_entry_copy (cur->data);
429 ret->entries = g_list_prepend (ret->entries, entry);
433 ret->entries = g_list_reverse (ret->entries);
439 * gst_toc_entry_set_start_stop_times:
440 * @entry: #GstTocEntry to set values.
441 * @start: start value to set.
442 * @stop: stop value to set.
444 * Set @start and @stop values for the @entry.
447 gst_toc_entry_set_start_stop_times (GstTocEntry * entry, gint64 start,
450 g_return_if_fail (entry != NULL);
452 entry->start = start;
457 * gst_toc_entry_get_start_stop_times:
458 * @entry: #GstTocEntry to get values from.
459 * @start: (out): the storage for the start value, leave #NULL if not need.
460 * @stop: (out): the storage for the stop value, leave #NULL if not need.
462 * Get start and stop values from the @entry and write them into appropriate storages.
464 * Returns: TRUE if all non-NULL storage pointers were filled with appropriate values,
468 gst_toc_entry_get_start_stop_times (const GstTocEntry * entry, gint64 * start,
473 g_return_val_if_fail (entry != NULL, FALSE);
476 *start = entry->start;
484 * gst_toc_entry_type_get_nick:
485 * @type: a #GstTocEntryType.
487 * Converts @type to a string representation.
489 * Returns: Returns a human-readable string for @type. This string is
490 * only for debugging purpose and should not be displayed in a user
494 gst_toc_entry_type_get_nick (GstTocEntryType type)
497 case GST_TOC_ENTRY_TYPE_ANGLE:
499 case GST_TOC_ENTRY_TYPE_VERSION:
501 case GST_TOC_ENTRY_TYPE_EDITION:
503 case GST_TOC_ENTRY_TYPE_TITLE:
505 case GST_TOC_ENTRY_TYPE_TRACK:
507 case GST_TOC_ENTRY_TYPE_CHAPTER:
516 * gst_toc_entry_get_entry_type:
517 * @entry: a #GstTocEntry
519 * Returns: @entry's entry type
522 gst_toc_entry_get_entry_type (const GstTocEntry * entry)
524 g_return_val_if_fail (entry != NULL, GST_TOC_ENTRY_TYPE_INVALID);
530 * gst_toc_entry_is_alternative:
531 * @entry: a #GstTocEntry
533 * Returns: %TRUE if @entry's type is an alternative type, otherwise %FALSE
536 gst_toc_entry_is_alternative (const GstTocEntry * entry)
538 g_return_val_if_fail (entry != NULL, FALSE);
540 return GST_TOC_ENTRY_TYPE_IS_ALTERNATIVE (entry->type);
544 * gst_toc_entry_is_sequence:
545 * @entry: a #GstTocEntry
547 * Returns: %TRUE if @entry's type is a sequence type, otherwise %FALSE
550 gst_toc_entry_is_sequence (const GstTocEntry * entry)
552 g_return_val_if_fail (entry != NULL, FALSE);
554 return GST_TOC_ENTRY_TYPE_IS_SEQUENCE (entry->type);
558 * gst_toc_entry_get_uid:
559 * @entry: A #GstTocEntry instance
561 * Gets the UID of @entry.
563 * Returns: (transfer none): The UID of @entry
566 gst_toc_entry_get_uid (const GstTocEntry * entry)
568 g_return_val_if_fail (entry != NULL, NULL);
574 * gst_toc_entry_append_sub_entry:
575 * @entry: A #GstTocEntry instance
576 * @subentry: (transfer full): A #GstTocEntry
578 * Appends the #GstTocEntry @subentry to @entry.
581 gst_toc_entry_append_sub_entry (GstTocEntry * entry, GstTocEntry * subentry)
583 g_return_if_fail (entry != NULL);
584 g_return_if_fail (subentry != NULL);
585 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
586 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST
588 g_return_if_fail (subentry->toc == NULL);
589 g_return_if_fail (subentry->parent == NULL);
591 entry->subentries = g_list_append (entry->subentries, subentry);
592 subentry->toc = entry->toc;
593 subentry->parent = entry;
595 GST_LOG ("appended %s subentry with uid %s to entry %s",
596 gst_toc_entry_type_get_nick (subentry->type), subentry->uid, entry->uid);
600 * gst_toc_entry_get_uid:
601 * @entry: A #GstTocEntry instance
603 * Gets the sub-entries of @entry.
605 * Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry of @entry
608 gst_toc_entry_get_sub_entries (const GstTocEntry * entry)
610 g_return_val_if_fail (entry != NULL, NULL);
612 return entry->subentries;
616 * gst_toc_entry_set_tags:
617 * @entry: A #GstTocEntry instance
618 * @tags: (allow-none) (transfer full): A #GstTagList or %NULL
620 * Set a #GstTagList with tags for the complete @entry.
623 gst_toc_entry_set_tags (GstTocEntry * entry, GstTagList * tags)
625 g_return_if_fail (entry != NULL);
626 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
629 gst_tag_list_unref (entry->tags);
634 * gst_toc_entry_merge_tags:
635 * @entry: A #GstTocEntry instance
636 * @tags: (allow-none): A #GstTagList or %NULL
637 * @mode: A #GstTagMergeMode
639 * Merge @tags into the existing tags of @entry using @mode.
642 gst_toc_entry_merge_tags (GstTocEntry * entry, GstTagList * tags,
643 GstTagMergeMode mode)
645 g_return_if_fail (entry != NULL);
646 g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
649 entry->tags = gst_tag_list_ref (tags);
651 GstTagList *tmp = gst_tag_list_merge (entry->tags, tags, mode);
652 gst_tag_list_unref (entry->tags);
658 * gst_toc_entry_get_tags:
659 * @entry: A #GstTocEntry instance
661 * Gets the tags for @entry.
663 * Returns: (transfer none): A #GstTagList for @entry
666 gst_toc_entry_get_tags (const GstTocEntry * entry)
668 g_return_val_if_fail (entry != NULL, NULL);
674 * gst_toc_entry_get_toc:
675 * @entry: A #GstTocEntry instance
677 * Gets the parent #GstToc of @entry.
679 * Returns: (transfer none): The parent #GstToc of @entry
682 gst_toc_entry_get_toc (GstTocEntry * entry)
684 g_return_val_if_fail (entry != NULL, NULL);
690 * gst_toc_entry_get_parent:
691 * @entry: A #GstTocEntry instance
693 * Gets the parent #GstTocEntry of @entry.
695 * Returns: (transfer none): The parent #GstTocEntry of @entry
698 gst_toc_entry_get_parent (GstTocEntry * entry)
700 g_return_val_if_fail (entry != NULL, NULL);
702 return entry->parent;
705 #ifndef GST_DISABLE_GST_DEBUG
707 gst_toc_dump_entries (GList * entries, guint depth)
712 indent = g_malloc0 (depth + 1);
713 memset (indent, ' ', depth);
714 for (e = entries; e != NULL; e = e->next) {
715 GstTocEntry *entry = e->data;
717 GST_TRACE ("%s+ %s (%s), %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT ", "
718 "tags: %" GST_PTR_FORMAT, indent, entry->uid,
719 gst_toc_entry_type_get_nick (entry->type),
720 GST_TIME_ARGS (entry->start), GST_TIME_ARGS (entry->stop), entry->tags);
722 if (entry->subentries != NULL)
723 gst_toc_dump_entries (entry->subentries, depth + 2);
730 gst_toc_dump (GstToc * toc)
732 #ifndef GST_DISABLE_GST_DEBUG
733 GST_TRACE (" Toc %p, tags: %" GST_PTR_FORMAT, toc, toc->tags);
734 gst_toc_dump_entries (toc->entries, 2);