gstreamer/gst/gstindex.c

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/* GStreamer
* Copyright (C) 2001 RidgeRun (http://www.ridgerun.com/)
* Written by Erik Walthinsen <omega@ridgerun.com>
*
* gstindex.c: Index for mappings and other data
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gst_private.h"
#include "gstinfo.h"
#include "gstindex.h"
#include "gstmarshal.h"
#include "gstregistry.h"
/* for constructing an entry name */
#include "gstelement.h"
#include "gstpad.h"
/* Index signals and args */
enum
{
ENTRY_ADDED,
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_RESOLVER
/* FILL ME */
};
static void gst_index_class_init (GstIndexClass * klass);
static void gst_index_init (GstIndex * index);
static void gst_index_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_index_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstIndexGroup *gst_index_group_new (guint groupnum);
static gboolean gst_index_path_resolver (GstIndex * index, GstObject * writer,
gchar ** writer_string, gpointer data);
static gboolean gst_index_gtype_resolver (GstIndex * index, GstObject * writer,
gchar ** writer_string, gpointer data);
static void gst_index_add_entry (GstIndex * index, GstIndexEntry * entry);
static GstObject *parent_class = NULL;
static guint gst_index_signals[LAST_SIGNAL] = { 0 };
typedef struct
{
GstIndexResolverMethod method;
GstIndexResolver resolver;
gpointer user_data;
}
ResolverEntry;
static const ResolverEntry resolvers[] = {
{GST_INDEX_RESOLVER_CUSTOM, NULL, NULL},
{GST_INDEX_RESOLVER_GTYPE, gst_index_gtype_resolver, NULL},
{GST_INDEX_RESOLVER_PATH, gst_index_path_resolver, NULL},
};
#define GST_TYPE_INDEX_RESOLVER (gst_index_resolver_get_type())
static GType
gst_index_resolver_get_type (void)
{
static GType index_resolver_type = 0;
static GEnumValue index_resolver[] = {
{GST_INDEX_RESOLVER_CUSTOM, "GST_INDEX_RESOLVER_CUSTOM",
"Use a custom resolver"},
{GST_INDEX_RESOLVER_GTYPE, "GST_INDEX_RESOLVER_GTYPE",
"Resolve an object to its GType[.padname]"},
{GST_INDEX_RESOLVER_PATH, "GST_INDEX_RESOLVER_PATH",
"Resolve an object to its path in the pipeline"},
{0, NULL, NULL},
};
if (!index_resolver_type) {
index_resolver_type =
g_enum_register_static ("GstIndexResolver", index_resolver);
}
return index_resolver_type;
}
GType
gst_index_entry_get_type (void)
{
static GType index_entry_type = 0;
if (!index_entry_type) {
index_entry_type = g_boxed_type_register_static ("GstIndexEntry",
(GBoxedCopyFunc) gst_index_entry_copy,
(GBoxedFreeFunc) gst_index_entry_free);
}
return index_entry_type;
}
GType
gst_index_get_type (void)
{
static GType index_type = 0;
if (!index_type) {
static const GTypeInfo index_info = {
sizeof (GstIndexClass),
NULL,
NULL,
(GClassInitFunc) gst_index_class_init,
NULL,
NULL,
sizeof (GstIndex),
0,
(GInstanceInitFunc) gst_index_init,
NULL
};
index_type =
g_type_register_static (GST_TYPE_OBJECT, "GstIndex", &index_info, 0);
}
return index_type;
}
static void
gst_index_class_init (GstIndexClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gst_index_signals[ENTRY_ADDED] =
g_signal_new ("entry-added", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstIndexClass, entry_added), NULL, NULL,
gst_marshal_VOID__BOXED, G_TYPE_NONE, 1, GST_TYPE_INDEX_ENTRY);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_index_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_index_get_property);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RESOLVER,
g_param_spec_enum ("resolver", "Resolver",
"Select a predefined object to string mapper",
GST_TYPE_INDEX_RESOLVER, GST_INDEX_RESOLVER_PATH, G_PARAM_READWRITE));
}
static void
gst_index_init (GstIndex * index)
{
index->curgroup = gst_index_group_new (0);
index->maxgroup = 0;
index->groups = g_list_prepend (NULL, index->curgroup);
index->writers = g_hash_table_new (NULL, NULL);
index->last_id = 0;
index->method = GST_INDEX_RESOLVER_PATH;
index->resolver = resolvers[index->method].resolver;
index->resolver_user_data = resolvers[index->method].user_data;
GST_FLAG_SET (index, GST_INDEX_WRITABLE);
GST_FLAG_SET (index, GST_INDEX_READABLE);
GST_DEBUG ("created new index");
}
static void
gst_index_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstIndex *index;
index = GST_INDEX (object);
switch (prop_id) {
case ARG_RESOLVER:
index->method = g_value_get_enum (value);
index->resolver = resolvers[index->method].resolver;
index->resolver_user_data = resolvers[index->method].user_data;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_index_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstIndex *index;
index = GST_INDEX (object);
switch (prop_id) {
case ARG_RESOLVER:
g_value_set_enum (value, index->method);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstIndexGroup *
gst_index_group_new (guint groupnum)
{
GstIndexGroup *indexgroup = g_new (GstIndexGroup, 1);
indexgroup->groupnum = groupnum;
indexgroup->entries = NULL;
indexgroup->certainty = GST_INDEX_UNKNOWN;
indexgroup->peergroup = -1;
GST_DEBUG ("created new index group %d", groupnum);
return indexgroup;
}
/**
* gst_index_new:
*
* Create a new tileindex object
*
* Returns: a new index object
*/
GstIndex *
gst_index_new (void)
{
GstIndex *index;
index = g_object_new (gst_index_get_type (), NULL);
return index;
}
/**
* gst_index_commit:
* @index: the index to commit
* @id: the writer that commited the index
*
* Tell the index that the writer with the given id is done
* with this index and is not going to write any more entries
* to it.
*/
void
gst_index_commit (GstIndex * index, gint id)
{
GstIndexClass *iclass;
iclass = GST_INDEX_GET_CLASS (index);
if (iclass->commit)
iclass->commit (index, id);
}
/**
* gst_index_get_group:
* @index: the index to get the current group from
*
* Get the id of the current group.
*
* Returns: the id of the current group.
*/
gint
gst_index_get_group (GstIndex * index)
{
return index->curgroup->groupnum;
}
/**
* gst_index_new_group:
* @index: the index to create the new group in
*
* Create a new group for the given index. It will be
* set as the current group.
*
* Returns: the id of the newly created group.
*/
gint
gst_index_new_group (GstIndex * index)
{
index->curgroup = gst_index_group_new (++index->maxgroup);
index->groups = g_list_append (index->groups, index->curgroup);
GST_DEBUG ("created new group %d in index", index->maxgroup);
return index->maxgroup;
}
/**
* gst_index_set_group:
* @index: the index to set the new group in
* @groupnum: the groupnumber to set
*
* Set the current groupnumber to the given argument.
*
* Returns: TRUE if the operation succeeded, FALSE if the group
* did not exist.
*/
gboolean
gst_index_set_group (GstIndex * index, gint groupnum)
{
GList *list;
GstIndexGroup *indexgroup;
/* first check for null change */
if (groupnum == index->curgroup->groupnum)
return TRUE;
/* else search for the proper group */
list = index->groups;
while (list) {
indexgroup = (GstIndexGroup *) (list->data);
list = g_list_next (list);
if (indexgroup->groupnum == groupnum) {
index->curgroup = indexgroup;
GST_DEBUG ("switched to index group %d", indexgroup->groupnum);
return TRUE;
}
}
/* couldn't find the group in question */
GST_DEBUG ("couldn't find index group %d", groupnum);
return FALSE;
}
/**
* gst_index_set_certainty:
* @index: the index to set the certainty on
* @certainty: the certainty to set
*
* Set the certainty of the given index.
*/
void
gst_index_set_certainty (GstIndex * index, GstIndexCertainty certainty)
{
index->curgroup->certainty = certainty;
}
/**
* gst_index_get_certainty:
* @index: the index to get the certainty of
*
* Get the certainty of the given index.
*
* Returns: the certainty of the index.
*/
GstIndexCertainty
gst_index_get_certainty (GstIndex * index)
{
return index->curgroup->certainty;
}
/**
* gst_index_set_filter:
* @index: the index to register the filter on
* @filter: the filter to register
* @user_data: data passed to the filter function
*
* Lets the app register a custom filter function so that
* it can select what entries should be stored in the index.
*/
void
gst_index_set_filter (GstIndex * index,
GstIndexFilter filter, gpointer user_data)
{
g_return_if_fail (GST_IS_INDEX (index));
index->filter = filter;
index->filter_user_data = user_data;
}
/**
* gst_index_set_resolver:
* @index: the index to register the resolver on
* @resolver: the resolver to register
* @user_data: data passed to the resolver function
*
* Lets the app register a custom function to map index
* ids to writer descriptions.
*/
void
gst_index_set_resolver (GstIndex * index,
GstIndexResolver resolver, gpointer user_data)
{
g_return_if_fail (GST_IS_INDEX (index));
index->resolver = resolver;
index->resolver_user_data = user_data;
index->method = GST_INDEX_RESOLVER_CUSTOM;
}
/**
* gst_index_entry_copy:
* @entry: the entry to copy
*
* Copies an entry and returns the result.
*
* Returns: a newly allocated #GstIndexEntry.
*/
GstIndexEntry *
gst_index_entry_copy (GstIndexEntry * entry)
{
return g_memdup (entry, sizeof (*entry));
}
/**
* gst_index_entry_free:
* @entry: the entry to free
*
* Free the memory used by the given entry.
*/
void
gst_index_entry_free (GstIndexEntry * entry)
{
g_free (entry);
}
/**
* gst_index_add_format:
* @index: the index to add the entry to
* @id: the id of the index writer
* @format: the format to add to the index
*
* Adds a format entry into the index. This function is
* used to map dynamic GstFormat ids to their original
* format key.
*
* Returns: a pointer to the newly added entry in the index.
*/
GstIndexEntry *
gst_index_add_format (GstIndex * index, gint id, GstFormat format)
{
GstIndexEntry *entry;
const GstFormatDefinition *def;
g_return_val_if_fail (GST_IS_INDEX (index), NULL);
g_return_val_if_fail (format != 0, NULL);
if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
return NULL;
entry = g_new0 (GstIndexEntry, 1);
entry->type = GST_INDEX_ENTRY_FORMAT;
entry->id = id;
entry->data.format.format = format;
def = gst_format_get_details (format);
entry->data.format.key = def->nick;
gst_index_add_entry (index, entry);
return entry;
}
/**
* gst_index_add_id:
* @index: the index to add the entry to
* @id: the id of the index writer
* @description: the description of the index writer
*
* Add an id entry into the index.
*
* Returns: a pointer to the newly added entry in the index.
*/
GstIndexEntry *
gst_index_add_id (GstIndex * index, gint id, gchar * description)
{
GstIndexEntry *entry;
g_return_val_if_fail (GST_IS_INDEX (index), NULL);
g_return_val_if_fail (description != NULL, NULL);
if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
return NULL;
entry = g_new0 (GstIndexEntry, 1);
entry->type = GST_INDEX_ENTRY_ID;
entry->id = id;
entry->data.id.description = description;
gst_index_add_entry (index, entry);
return entry;
}
static gboolean
gst_index_path_resolver (GstIndex * index, GstObject * writer,
gchar ** writer_string, gpointer data)
{
*writer_string = gst_object_get_path_string (writer);
return TRUE;
}
static gboolean
gst_index_gtype_resolver (GstIndex * index, GstObject * writer,
gchar ** writer_string, gpointer data)
{
if (GST_IS_PAD (writer)) {
GstElement *element =
(GstElement *) gst_object_get_parent (GST_OBJECT (writer));
*writer_string = g_strdup_printf ("%s.%s",
g_type_name (G_OBJECT_TYPE (element)), gst_object_get_name (writer));
} else {
*writer_string =
g_strdup_printf ("%s", g_type_name (G_OBJECT_TYPE (writer)));
}
return TRUE;
}
/**
* gst_index_get_writer_id:
* @index: the index to get a unique write id for
* @writer: the GstObject to allocate an id for
* @id: a pointer to a gint to hold the id
*
* Before entries can be added to the index, a writer
* should obtain a unique id. The methods to add new entries
* to the index require this id as an argument.
*
* The application can implement a custom function to map the writer object
* to a string. That string will be used to register or look up an id
* in the index.
*
* Returns: TRUE if the writer would be mapped to an id.
*/
gboolean
gst_index_get_writer_id (GstIndex * index, GstObject * writer, gint * id)
{
gchar *writer_string = NULL;
GstIndexEntry *entry;
GstIndexClass *iclass;
gboolean success = FALSE;
g_return_val_if_fail (GST_IS_INDEX (index), FALSE);
g_return_val_if_fail (GST_IS_OBJECT (writer), FALSE);
g_return_val_if_fail (id, FALSE);
*id = -1;
/* first try to get a previously cached id */
entry = g_hash_table_lookup (index->writers, writer);
if (entry == NULL) {
iclass = GST_INDEX_GET_CLASS (index);
/* let the app make a string */
if (index->resolver) {
gboolean res;
res =
index->resolver (index, writer, &writer_string,
index->resolver_user_data);
if (!res)
return FALSE;
} else {
g_warning ("no resolver found");
return FALSE;
}
/* if the index has a resolver, make it map this string to an id */
if (iclass->get_writer_id) {
success = iclass->get_writer_id (index, id, writer_string);
}
/* if the index could not resolve, we allocate one ourselves */
if (!success) {
*id = ++index->last_id;
}
entry = gst_index_add_id (index, *id, writer_string);
if (!entry) {
/* index is probably not writable, make an entry anyway
* to keep it in our cache */
entry = g_new0 (GstIndexEntry, 1);
entry->type = GST_INDEX_ENTRY_ID;
entry->id = *id;
entry->data.id.description = writer_string;
}
g_hash_table_insert (index->writers, writer, entry);
} else {
*id = entry->id;
}
return TRUE;
}
static void
gst_index_add_entry (GstIndex * index, GstIndexEntry * entry)
{
GstIndexClass *iclass;
iclass = GST_INDEX_GET_CLASS (index);
if (iclass->add_entry) {
iclass->add_entry (index, entry);
}
g_signal_emit (G_OBJECT (index), gst_index_signals[ENTRY_ADDED], 0, entry);
}
/**
* gst_index_add_associationv:
* @index: the index to add the entry to
* @id: the id of the index writer
* @flags: optinal flags for this entry
* @n: number of associations
* @list: list of associations
* @...: other format/value pairs or 0 to end the list
*
* Associate given format/value pairs with each other.
*
* Returns: a pointer to the newly added entry in the index.
*/
GstIndexEntry *
gst_index_add_associationv (GstIndex * index, gint id, GstAssocFlags flags,
int n, const GstIndexAssociation * list)
{
GstIndexEntry *entry;
g_return_val_if_fail (n > 0, NULL);
g_return_val_if_fail (list != NULL, NULL);
g_return_val_if_fail (GST_IS_INDEX (index), NULL);
if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
return NULL;
entry = g_malloc (sizeof (GstIndexEntry));
entry->type = GST_INDEX_ENTRY_ASSOCIATION;
entry->id = id;
entry->data.assoc.flags = flags;
entry->data.assoc.assocs = g_memdup (list, sizeof (GstIndexAssociation) * n);
entry->data.assoc.nassocs = n;
gst_index_add_entry (index, entry);
return entry;
}
/**
* gst_index_add_association:
* @index: the index to add the entry to
* @id: the id of the index writer
* @flags: optinal flags for this entry
* @format: the format of the value
* @value: the value
* @...: other format/value pairs or 0 to end the list
*
* Associate given format/value pairs with each other.
* Be sure to pass gint64 values to this functions varargs,
* you might want to use a gint64 cast to be sure.
*
* Returns: a pointer to the newly added entry in the index.
*/
GstIndexEntry *
gst_index_add_association (GstIndex * index, gint id, GstAssocFlags flags,
GstFormat format, gint64 value, ...)
{
va_list args;
GstIndexEntry *entry;
GstIndexAssociation *list;
gint n_assocs = 0;
GstFormat cur_format;
GArray *array;
g_return_val_if_fail (GST_IS_INDEX (index), NULL);
g_return_val_if_fail (format != 0, NULL);
if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
return NULL;
array = g_array_new (FALSE, FALSE, sizeof (GstIndexAssociation));
va_start (args, value);
cur_format = format;
n_assocs = 0;
while (cur_format) {
GstIndexAssociation a;
n_assocs++;
cur_format = va_arg (args, GstFormat);
if (cur_format) {
a.format = cur_format;
a.value = va_arg (args, gint64);
g_array_append_val (array, a);
}
}
va_end (args);
list = (GstIndexAssociation *) g_array_free (array, FALSE);
entry = gst_index_add_associationv (index, id, flags, n_assocs, list);
g_free (list);
return entry;
}
/**
* gst_index_add_object:
* @index: the index to add the object to
* @id: the id of the index writer
* @key: a key for the object
* @type: the GType of the object
* @object: a pointer to the object to add
*
* Add the given object to the index with the given key.
*
* Returns: a pointer to the newly added entry in the index.
*/
GstIndexEntry *
gst_index_add_object (GstIndex * index, gint id, gchar * key,
GType type, gpointer object)
{
if (!GST_INDEX_IS_WRITABLE (index) || id == -1)
return NULL;
return NULL;
}
static gint
gst_index_compare_func (gconstpointer a, gconstpointer b, gpointer user_data)
{
if (a < b)
return -1;
if (a > b)
return 1;
return 0;
}
/**
* gst_index_get_assoc_entry:
* @index: the index to search
* @id: the id of the index writer
* @method: The lookup method to use
* @flags: Flags for the entry
* @format: the format of the value
* @value: the value to find
*
* Finds the given format/value in the index
*
* Returns: the entry associated with the value or NULL if the
* value was not found.
*/
GstIndexEntry *
gst_index_get_assoc_entry (GstIndex * index, gint id,
GstIndexLookupMethod method, GstAssocFlags flags,
GstFormat format, gint64 value)
{
g_return_val_if_fail (GST_IS_INDEX (index), NULL);
if (id == -1)
return NULL;
return gst_index_get_assoc_entry_full (index, id, method, flags, format,
value, gst_index_compare_func, NULL);
}
/**
* gst_index_get_assoc_entry_full:
* @index: the index to search
* @id: the id of the index writer
* @method: The lookup method to use
* @flags: Flags for the entry
* @format: the format of the value
* @value: the value to find
* @func: the function used to compare entries
* @user_data: user data passed to the compare function
*
* Finds the given format/value in the index with the given
* compare function and user_data.
*
* Returns: the entry associated with the value or NULL if the
* value was not found.
*/
GstIndexEntry *
gst_index_get_assoc_entry_full (GstIndex * index, gint id,
GstIndexLookupMethod method, GstAssocFlags flags,
GstFormat format, gint64 value, GCompareDataFunc func, gpointer user_data)
{
GstIndexClass *iclass;
g_return_val_if_fail (GST_IS_INDEX (index), NULL);
if (id == -1)
return NULL;
iclass = GST_INDEX_GET_CLASS (index);
if (iclass->get_assoc_entry)
return iclass->get_assoc_entry (index, id, method, flags, format, value,
func, user_data);
return NULL;
}
/**
* gst_index_entry_assoc_map:
* @entry: the index to search
* @format: the format of the value the find
* @value: a pointer to store the value
*
* Gets alternative formats associated with the indexentry.
*
* Returns: TRUE if there was a value associated with the given
* format.
*/
gboolean
gst_index_entry_assoc_map (GstIndexEntry * entry,
GstFormat format, gint64 * value)
{
gint i;
g_return_val_if_fail (entry != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
for (i = 0; i < GST_INDEX_NASSOCS (entry); i++) {
if (GST_INDEX_ASSOC_FORMAT (entry, i) == format) {
*value = GST_INDEX_ASSOC_VALUE (entry, i);
return TRUE;
}
}
return FALSE;
}
static void gst_index_factory_class_init (GstIndexFactoryClass * klass);
static void gst_index_factory_init (GstIndexFactory * factory);
static GstPluginFeatureClass *factory_parent_class = NULL;
/* static guint gst_index_factory_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_index_factory_get_type (void)
{
static GType indexfactory_type = 0;
if (!indexfactory_type) {
static const GTypeInfo indexfactory_info = {
sizeof (GstIndexFactoryClass),
NULL,
NULL,
(GClassInitFunc) gst_index_factory_class_init,
NULL,
NULL,
sizeof (GstIndexFactory),
0,
(GInstanceInitFunc) gst_index_factory_init,
NULL
};
indexfactory_type = g_type_register_static (GST_TYPE_PLUGIN_FEATURE,
"GstIndexFactory", &indexfactory_info, 0);
}
return indexfactory_type;
}
static void
gst_index_factory_class_init (GstIndexFactoryClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstPluginFeatureClass *gstpluginfeature_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
gstpluginfeature_class = (GstPluginFeatureClass *) klass;
factory_parent_class = g_type_class_ref (GST_TYPE_PLUGIN_FEATURE);
}
static void
gst_index_factory_init (GstIndexFactory * factory)
{
}
/**
* gst_index_factory_new:
* @name: name of indexfactory to create
* @longdesc: long description of indexfactory to create
* @type: the GType of the GstIndex element of this factory
*
* Create a new indexfactory with the given parameters
*
* Returns: a new #GstIndexFactory.
*/
GstIndexFactory *
gst_index_factory_new (const gchar * name, const gchar * longdesc, GType type)
{
GstIndexFactory *factory;
g_return_val_if_fail (name != NULL, NULL);
factory = gst_index_factory_find (name);
if (!factory) {
factory = GST_INDEX_FACTORY (g_object_new (GST_TYPE_INDEX_FACTORY, NULL));
}
GST_PLUGIN_FEATURE_NAME (factory) = g_strdup (name);
if (factory->longdesc)
g_free (factory->longdesc);
factory->longdesc = g_strdup (longdesc);
factory->type = type;
return factory;
}
/**
* gst_index_factory_destroy:
* @factory: factory to destroy
*
* Removes the index from the global list.
*/
void
gst_index_factory_destroy (GstIndexFactory * factory)
{
g_return_if_fail (factory != NULL);
/* we don't free the struct bacause someone might have a handle to it.. */
}
/**
* gst_index_factory_find:
* @name: name of indexfactory to find
*
* Search for an indexfactory of the given name.
*
* Returns: #GstIndexFactory if found, NULL otherwise
*/
GstIndexFactory *
gst_index_factory_find (const gchar * name)
{
GstPluginFeature *feature;
g_return_val_if_fail (name != NULL, NULL);
GST_DEBUG ("gstindex: find \"%s\"", name);
feature = gst_registry_find_feature (gst_registry_get_default (), name,
GST_TYPE_INDEX_FACTORY);
if (feature)
return GST_INDEX_FACTORY (feature);
return NULL;
}
/**
* gst_index_factory_create:
* @factory: the factory used to create the instance
*
* Create a new #GstIndex instance from the
* given indexfactory.
*
* Returns: A new #GstIndex instance.
*/
GstIndex *
gst_index_factory_create (GstIndexFactory * factory)
{
GstIndex *new = NULL;
g_return_val_if_fail (factory != NULL, NULL);
factory =
GST_INDEX_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE
(factory)));
if (factory == NULL)
return NULL;
new = GST_INDEX (g_object_new (factory->type, NULL));
return new;
}
/**
* gst_index_factory_make:
* @name: the name of the factory used to create the instance
*
* Create a new #GstIndex instance from the
* indexfactory with the given name.
*
* Returns: A new #GstIndex instance.
*/
GstIndex *
gst_index_factory_make (const gchar * name)
{
GstIndexFactory *factory;
g_return_val_if_fail (name != NULL, NULL);
factory = gst_index_factory_find (name);
if (factory == NULL)
return NULL;
return gst_index_factory_create (factory);
}