gstreamer/gst/gsttoc.c

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/* GStreamer
* (c) 2010, 2012 Alexander Saprykin <xelfium@gmail.com>
*
* gsttoc.c: GstToc initialization and parsing/creation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gsttoc
* @short_description: Generic table of contents support
* @see_also: #GstStructure, #GstEvent, #GstMessage, #GstQuery
*
* #GstToc functions are used to create/free #GstToc and #GstTocEntry structures.
* Also they are used to convert #GstToc into #GstStructure and vice versa.
*
* #GstToc lets you to inform other elements in pipeline or application that playing
* source has some kind of table of contents (TOC). These may be chapters, editions,
* angles or other types. For example: DVD chapters, Matroska chapters or cue sheet
* TOC. Such TOC will be useful for applications to display instead of just a
* playlist.
*
* Using TOC is very easy. Firstly, create #GstToc structure which represents root
* contents of the source. You can also attach TOC-specific tags to it. Then fill
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* it with #GstTocEntry entries by appending them to the #GstToc using
* gst_toc_append_entry(), and appending subentries to a #GstTocEntry using
* gst_toc_entry_append_sub_entry().
*
* Note that root level of the TOC can contain only either editions or chapters. You
* should not mix them together at the same level. Otherwise you will get serialization
* /deserialization errors. Make sure that no one of the entries has negative start and
* stop values.
*
* Use gst_event_new_toc() to create a new TOC #GstEvent, and gst_event_parse_toc() to
* parse received TOC event. Use gst_event_new_toc_select() to create a new TOC select #GstEvent,
* and gst_event_parse_toc_select() to parse received TOC select event. The same rule for
* the #GstMessage: gst_message_new_toc() to create new TOC #GstMessage, and
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* gst_message_parse_toc() to parse received TOC message.
*
* TOCs can have global scope or current scope. Global scope TOCs contain
* all entries that can possibly be selected using a toc select event, and
* are what an application is usually interested in. TOCs with current scope
* only contain the parts of the TOC relevant to the currently selected/playing
* stream; the current scope TOC is used by downstream elements such as muxers
* to write correct TOC entries when transcoding files, for example. When
* playing a DVD, the global TOC would contain a hierarchy of all titles,
* chapters and angles, for example, while the current TOC would only contain
* the chapters for the currently playing title if playback of a specific
* title was requested.
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*
* Applications and plugins should not rely on TOCs having a certain kind of
* structure, but should allow for different alternatives. For example, a
* simple CUE sheet embedded in a file may be presented as a flat list of
* track entries, or could have a top-level edition node (or some other
* alternative type entry) with track entries underneath that node; or even
* multiple top-level edition nodes (or some other alternative type entries)
* each with track entries underneath, in case the source file has extracted
* a track listing from different sources).
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gst_private.h"
#include "gstenumtypes.h"
#include "gsttaglist.h"
#include "gststructure.h"
#include "gstvalue.h"
#include "gsttoc.h"
#include "gstpad.h"
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#include "gstquark.h"
struct _GstTocEntry
{
GstMiniObject mini_object;
GstToc *toc;
GstTocEntry *parent;
gchar *uid;
GstTocEntryType type;
GstClockTime start, stop;
GList *subentries;
GstTagList *tags;
};
struct _GstToc
{
GstMiniObject mini_object;
GstTocScope scope;
GList *entries;
GstTagList *tags;
};
#undef gst_toc_copy
static GstToc *gst_toc_copy (const GstToc * toc);
static void gst_toc_free (GstToc * toc);
#undef gst_toc_entry_copy
static GstTocEntry *gst_toc_entry_copy (const GstTocEntry * toc);
static void gst_toc_entry_free (GstTocEntry * toc);
GST_DEFINE_MINI_OBJECT_TYPE (GstToc, gst_toc);
GST_DEFINE_MINI_OBJECT_TYPE (GstTocEntry, gst_toc_entry);
/**
* gst_toc_new:
* @scope: scope of this TOC
*
* Create a new #GstToc structure.
*
* Returns: (transfer full): newly allocated #GstToc structure, free it
* with gst_toc_unref().
*/
GstToc *
gst_toc_new (GstTocScope scope)
{
GstToc *toc;
g_return_val_if_fail (scope == GST_TOC_SCOPE_GLOBAL ||
scope == GST_TOC_SCOPE_CURRENT, NULL);
toc = g_slice_new0 (GstToc);
gst_mini_object_init (GST_MINI_OBJECT_CAST (toc), 0, GST_TYPE_TOC,
(GstMiniObjectCopyFunction) gst_toc_copy, NULL,
(GstMiniObjectFreeFunction) gst_toc_free);
toc->scope = scope;
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toc->tags = gst_tag_list_new_empty ();
return toc;
}
/**
* gst_toc_get_scope:
* @toc: a #GstToc instance
*
* Returns: scope of @toc
*/
GstTocScope
gst_toc_get_scope (const GstToc * toc)
{
g_return_val_if_fail (toc != NULL, GST_TOC_SCOPE_GLOBAL);
return toc->scope;
}
/**
* gst_toc_set_tags:
* @toc: A #GstToc instance
* @tags: (allow-none) (transfer full): A #GstTagList or %NULL
*
* Set a #GstTagList with tags for the complete @toc.
*/
void
gst_toc_set_tags (GstToc * toc, GstTagList * tags)
{
g_return_if_fail (toc != NULL);
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
if (toc->tags)
gst_tag_list_unref (toc->tags);
toc->tags = tags;
}
/**
* gst_toc_merge_tags:
* @toc: A #GstToc instance
* @tags: (allow-none): A #GstTagList or %NULL
* @mode: A #GstTagMergeMode
*
* Merge @tags into the existing tags of @toc using @mode.
*/
void
gst_toc_merge_tags (GstToc * toc, GstTagList * tags, GstTagMergeMode mode)
{
g_return_if_fail (toc != NULL);
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
if (!toc->tags) {
toc->tags = gst_tag_list_ref (tags);
} else {
GstTagList *tmp = gst_tag_list_merge (toc->tags, tags, mode);
gst_tag_list_unref (toc->tags);
toc->tags = tmp;
}
}
/**
* gst_toc_get_tags:
* @toc: A #GstToc instance
*
* Gets the tags for @toc.
*
* Returns: (transfer none): A #GstTagList for @entry
*/
GstTagList *
gst_toc_get_tags (const GstToc * toc)
{
g_return_val_if_fail (toc != NULL, NULL);
return toc->tags;
}
/**
* gst_toc_append_entry:
* @toc: A #GstToc instance
* @entry: (transfer full): A #GstTocEntry
*
* Appends the #GstTocEntry @entry to @toc.
*/
void
gst_toc_append_entry (GstToc * toc, GstTocEntry * entry)
{
g_return_if_fail (toc != NULL);
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (toc)));
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
g_return_if_fail (entry->toc == NULL);
g_return_if_fail (entry->parent == NULL);
toc->entries = g_list_append (toc->entries, entry);
entry->toc = toc;
GST_LOG ("appended %s entry with uid %s to toc %p",
gst_toc_entry_type_get_nick (entry->type), entry->uid, toc);
gst_toc_dump (toc);
}
/**
* gst_toc_get_entries:
* @toc: A #GstToc instance
*
* Gets the list of #GstTocEntry of @toc.
*
* Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry for @entry
*/
GList *
gst_toc_get_entries (const GstToc * toc)
{
g_return_val_if_fail (toc != NULL, NULL);
return toc->entries;
}
static GstTocEntry *
gst_toc_entry_new_internal (GstTocEntryType type, const gchar * uid)
{
GstTocEntry *entry;
entry = g_slice_new0 (GstTocEntry);
gst_mini_object_init (GST_MINI_OBJECT_CAST (entry), 0, GST_TYPE_TOC_ENTRY,
(GstMiniObjectCopyFunction) gst_toc_entry_copy, NULL,
(GstMiniObjectFreeFunction) gst_toc_entry_free);
entry->uid = g_strdup (uid);
entry->type = type;
entry->tags = NULL;
entry->start = entry->stop = GST_CLOCK_TIME_NONE;
return entry;
}
/**
* gst_toc_entry_new:
* @type: entry type.
* @uid: unique ID (UID) in the whole TOC.
*
* Create new #GstTocEntry structure.
*
* Returns: newly allocated #GstTocEntry structure, free it with gst_toc_entry_unref().
*/
GstTocEntry *
gst_toc_entry_new (GstTocEntryType type, const gchar * uid)
{
g_return_val_if_fail (uid != NULL, NULL);
return gst_toc_entry_new_internal (type, uid);
}
static void
gst_toc_free (GstToc * toc)
{
g_list_foreach (toc->entries, (GFunc) gst_mini_object_unref, NULL);
g_list_free (toc->entries);
if (toc->tags != NULL)
gst_tag_list_unref (toc->tags);
g_slice_free (GstToc, toc);
}
static void
gst_toc_entry_free (GstTocEntry * entry)
{
g_return_if_fail (entry != NULL);
g_list_foreach (entry->subentries, (GFunc) gst_mini_object_unref, NULL);
g_list_free (entry->subentries);
g_free (entry->uid);
if (entry->tags != NULL)
gst_tag_list_unref (entry->tags);
g_slice_free (GstTocEntry, entry);
}
static GstTocEntry *
gst_toc_entry_find_sub_entry (const GstTocEntry * entry, const gchar * uid)
{
GList *cur;
GstTocEntry *subentry, *subsubentry;
g_return_val_if_fail (entry != NULL, NULL);
g_return_val_if_fail (uid != NULL, NULL);
cur = entry->subentries;
while (cur != NULL) {
subentry = cur->data;
if (g_strcmp0 (subentry->uid, uid) == 0)
return subentry;
subsubentry = gst_toc_entry_find_sub_entry (subentry, uid);
if (subsubentry != NULL)
return subsubentry;
cur = cur->next;
}
return NULL;
}
/**
* gst_toc_find_entry:
* @toc: #GstToc to search in.
* @uid: UID to find #GstTocEntry with.
*
* Find #GstTocEntry with given @uid in the @toc.
*
* Returns: (transfer none): #GstTocEntry with specified @uid from the @toc, or NULL if not found.
*/
GstTocEntry *
gst_toc_find_entry (const GstToc * toc, const gchar * uid)
{
GList *cur;
GstTocEntry *entry, *subentry;
g_return_val_if_fail (toc != NULL, NULL);
g_return_val_if_fail (uid != NULL, NULL);
cur = toc->entries;
while (cur != NULL) {
entry = cur->data;
if (g_strcmp0 (entry->uid, uid) == 0)
return entry;
subentry = gst_toc_entry_find_sub_entry (entry, uid);
if (subentry != NULL)
return subentry;
cur = cur->next;
}
return NULL;
}
/**
* gst_toc_entry_copy:
* @entry: #GstTocEntry to copy.
*
* Copy #GstTocEntry with all subentries (deep copy).
*
* Returns: newly allocated #GstTocEntry in case of success, NULL otherwise;
* free it when done with gst_toc_entry_unref().
*/
static GstTocEntry *
gst_toc_entry_copy (const GstTocEntry * entry)
{
GstTocEntry *ret, *sub;
GstTagList *list;
GList *cur;
g_return_val_if_fail (entry != NULL, NULL);
ret = gst_toc_entry_new (entry->type, entry->uid);
ret->start = entry->start;
ret->stop = entry->stop;
if (GST_IS_TAG_LIST (entry->tags)) {
list = gst_tag_list_copy (entry->tags);
if (ret->tags)
gst_tag_list_unref (ret->tags);
ret->tags = list;
}
cur = entry->subentries;
while (cur != NULL) {
sub = gst_toc_entry_copy (cur->data);
if (sub != NULL)
ret->subentries = g_list_prepend (ret->subentries, sub);
cur = cur->next;
}
ret->subentries = g_list_reverse (ret->subentries);
return ret;
}
/**
* gst_toc_copy:
* @toc: #GstToc to copy.
*
* Copy #GstToc with all subentries (deep copy).
*
* Returns: newly allocated #GstToc in case of success, NULL otherwise;
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* free it when done with gst_toc_unref().
*/
static GstToc *
gst_toc_copy (const GstToc * toc)
{
GstToc *ret;
GstTocEntry *entry;
GList *cur;
GstTagList *list;
g_return_val_if_fail (toc != NULL, NULL);
ret = gst_toc_new (toc->scope);
if (GST_IS_TAG_LIST (toc->tags)) {
list = gst_tag_list_copy (toc->tags);
gst_tag_list_unref (ret->tags);
ret->tags = list;
}
cur = toc->entries;
while (cur != NULL) {
entry = gst_toc_entry_copy (cur->data);
if (entry != NULL)
ret->entries = g_list_prepend (ret->entries, entry);
cur = cur->next;
}
ret->entries = g_list_reverse (ret->entries);
return ret;
}
/**
* gst_toc_entry_set_start_stop_times:
* @entry: #GstTocEntry to set values.
* @start: start value to set.
* @stop: stop value to set.
*
* Set @start and @stop values for the @entry.
*/
void
gst_toc_entry_set_start_stop_times (GstTocEntry * entry, gint64 start,
gint64 stop)
{
g_return_if_fail (entry != NULL);
entry->start = start;
entry->stop = stop;
}
/**
* gst_toc_entry_get_start_stop_times:
* @entry: #GstTocEntry to get values from.
* @start: (out): the storage for the start value, leave #NULL if not need.
* @stop: (out): the storage for the stop value, leave #NULL if not need.
*
* Get start and stop values from the @entry and write them into appropriate storages.
*
* Returns: TRUE if all non-NULL storage pointers were filled with appropriate values,
* FALSE otherwise.
*/
gboolean
gst_toc_entry_get_start_stop_times (const GstTocEntry * entry, gint64 * start,
gint64 * stop)
{
gboolean ret = TRUE;
g_return_val_if_fail (entry != NULL, FALSE);
if (start != NULL)
*start = entry->start;
if (stop != NULL)
*stop = entry->stop;
return ret;
}
/**
* gst_toc_entry_type_get_nick:
* @type: a #GstTocEntryType.
*
* Converts @type to a string representation.
*
* Returns: Returns a human-readable string for @type. This string is
* only for debugging purpose and should not be displayed in a user
* interface.
*/
const gchar *
gst_toc_entry_type_get_nick (GstTocEntryType type)
{
switch (type) {
case GST_TOC_ENTRY_TYPE_ANGLE:
return "angle";
case GST_TOC_ENTRY_TYPE_VERSION:
return "version";
case GST_TOC_ENTRY_TYPE_EDITION:
return "edition";
case GST_TOC_ENTRY_TYPE_TITLE:
return "title";
case GST_TOC_ENTRY_TYPE_TRACK:
return "track";
case GST_TOC_ENTRY_TYPE_CHAPTER:
return "chapter";
default:
break;
}
return "invalid";
}
/**
* gst_toc_entry_get_entry_type:
* @entry: a #GstTocEntry
*
* Returns: @entry's entry type
*/
GstTocEntryType
gst_toc_entry_get_entry_type (const GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, GST_TOC_ENTRY_TYPE_INVALID);
return entry->type;
}
/**
* gst_toc_entry_is_alternative:
* @entry: a #GstTocEntry
*
* Returns: %TRUE if @entry's type is an alternative type, otherwise %FALSE
*/
gboolean
gst_toc_entry_is_alternative (const GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, FALSE);
return GST_TOC_ENTRY_TYPE_IS_ALTERNATIVE (entry->type);
}
/**
* gst_toc_entry_is_sequence:
* @entry: a #GstTocEntry
*
* Returns: %TRUE if @entry's type is a sequence type, otherwise %FALSE
*/
gboolean
gst_toc_entry_is_sequence (const GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, FALSE);
return GST_TOC_ENTRY_TYPE_IS_SEQUENCE (entry->type);
}
/**
* gst_toc_entry_get_uid:
* @entry: A #GstTocEntry instance
*
* Gets the UID of @entry.
*
* Returns: (transfer none): The UID of @entry
*/
const gchar *
gst_toc_entry_get_uid (const GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, NULL);
return entry->uid;
}
/**
* gst_toc_entry_append_sub_entry:
* @entry: A #GstTocEntry instance
* @subentry: (transfer full): A #GstTocEntry
*
* Appends the #GstTocEntry @subentry to @entry.
*/
void
gst_toc_entry_append_sub_entry (GstTocEntry * entry, GstTocEntry * subentry)
{
g_return_if_fail (entry != NULL);
g_return_if_fail (subentry != NULL);
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST
(subentry)));
g_return_if_fail (subentry->toc == NULL);
g_return_if_fail (subentry->parent == NULL);
entry->subentries = g_list_append (entry->subentries, subentry);
subentry->toc = entry->toc;
subentry->parent = entry;
GST_LOG ("appended %s subentry with uid %s to entry %s",
gst_toc_entry_type_get_nick (subentry->type), subentry->uid, entry->uid);
}
/**
* gst_toc_entry_get_sub_entries:
* @entry: A #GstTocEntry instance
*
* Gets the sub-entries of @entry.
*
* Returns: (transfer none) (element-type Gst.TocEntry): A #GList of #GstTocEntry of @entry
*/
GList *
gst_toc_entry_get_sub_entries (const GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, NULL);
return entry->subentries;
}
/**
* gst_toc_entry_set_tags:
* @entry: A #GstTocEntry instance
* @tags: (allow-none) (transfer full): A #GstTagList or %NULL
*
* Set a #GstTagList with tags for the complete @entry.
*/
void
gst_toc_entry_set_tags (GstTocEntry * entry, GstTagList * tags)
{
g_return_if_fail (entry != NULL);
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
if (entry->tags)
gst_tag_list_unref (entry->tags);
entry->tags = tags;
}
/**
* gst_toc_entry_merge_tags:
* @entry: A #GstTocEntry instance
* @tags: (allow-none): A #GstTagList or %NULL
* @mode: A #GstTagMergeMode
*
* Merge @tags into the existing tags of @entry using @mode.
*/
void
gst_toc_entry_merge_tags (GstTocEntry * entry, GstTagList * tags,
GstTagMergeMode mode)
{
g_return_if_fail (entry != NULL);
g_return_if_fail (gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (entry)));
if (!entry->tags) {
entry->tags = gst_tag_list_ref (tags);
} else {
GstTagList *tmp = gst_tag_list_merge (entry->tags, tags, mode);
gst_tag_list_unref (entry->tags);
entry->tags = tmp;
}
}
/**
* gst_toc_entry_get_tags:
* @entry: A #GstTocEntry instance
*
* Gets the tags for @entry.
*
* Returns: (transfer none): A #GstTagList for @entry
*/
GstTagList *
gst_toc_entry_get_tags (const GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, NULL);
return entry->tags;
}
/**
* gst_toc_entry_get_toc:
* @entry: A #GstTocEntry instance
*
* Gets the parent #GstToc of @entry.
*
* Returns: (transfer none): The parent #GstToc of @entry
*/
GstToc *
gst_toc_entry_get_toc (GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, NULL);
return entry->toc;
}
/**
* gst_toc_entry_get_parent:
* @entry: A #GstTocEntry instance
*
* Gets the parent #GstTocEntry of @entry.
*
* Returns: (transfer none): The parent #GstTocEntry of @entry
*/
GstTocEntry *
gst_toc_entry_get_parent (GstTocEntry * entry)
{
g_return_val_if_fail (entry != NULL, NULL);
return entry->parent;
}
#ifndef GST_DISABLE_GST_DEBUG
static void
gst_toc_dump_entries (GList * entries, guint depth)
{
GList *e;
gchar *indent;
indent = g_malloc0 (depth + 1);
memset (indent, ' ', depth);
for (e = entries; e != NULL; e = e->next) {
GstTocEntry *entry = e->data;
GST_TRACE ("%s+ %s (%s), %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT ", "
"tags: %" GST_PTR_FORMAT, indent, entry->uid,
gst_toc_entry_type_get_nick (entry->type),
GST_TIME_ARGS (entry->start), GST_TIME_ARGS (entry->stop), entry->tags);
if (entry->subentries != NULL)
gst_toc_dump_entries (entry->subentries, depth + 2);
}
g_free (indent);
}
#endif
void
gst_toc_dump (GstToc * toc)
{
#ifndef GST_DISABLE_GST_DEBUG
GST_TRACE (" Toc %p, scope: %s, tags: %" GST_PTR_FORMAT, toc,
(toc->scope == GST_TOC_SCOPE_GLOBAL) ? "global" : "current", toc->tags);
gst_toc_dump_entries (toc->entries, 2);
#endif
}