mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-07-02 20:55:55 +00:00
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/* GStreamer
|
|
* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
|
|
*
|
|
* gstmeta.c: metadata operations
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:gstmeta
|
|
* @short_description: Buffer metadata
|
|
*
|
|
* Last reviewed on December 17th, 2009 (0.10.26)
|
|
*/
|
|
#include "gst_private.h"
|
|
|
|
#include "gstbuffer.h"
|
|
#include "gstmeta.h"
|
|
#include "gstinfo.h"
|
|
#include "gstutils.h"
|
|
|
|
static GHashTable *metainfo = NULL;
|
|
static GRWLock lock;
|
|
|
|
void
|
|
_priv_gst_meta_initialize (void)
|
|
{
|
|
g_rw_lock_init (&lock);
|
|
metainfo = g_hash_table_new (g_str_hash, g_str_equal);
|
|
}
|
|
|
|
/**
|
|
* gst_meta_register:
|
|
* @api: the name of the #GstMeta API
|
|
* @impl: the name of the #GstMeta implementation
|
|
* @size: the size of the #GstMeta structure
|
|
* @init_func: a #GstMetaInitFunction
|
|
* @free_func: a #GstMetaFreeFunction
|
|
* @copy_func: a #GstMetaCopyFunction
|
|
* @transform_func: a #GstMetaTransformFunction
|
|
*
|
|
* Register a new #GstMeta implementation.
|
|
*
|
|
* The same @info can be retrieved later with gst_meta_get_info() by using
|
|
* @impl as the key.
|
|
*
|
|
* Returns: (transfer none): a #GstMetaInfo that can be used to access metadata.
|
|
*/
|
|
|
|
const GstMetaInfo *
|
|
gst_meta_register (const gchar * api, const gchar * impl, gsize size,
|
|
GstMetaInitFunction init_func, GstMetaFreeFunction free_func,
|
|
GstMetaCopyFunction copy_func, GstMetaTransformFunction transform_func)
|
|
{
|
|
GstMetaInfo *info;
|
|
|
|
g_return_val_if_fail (api != NULL, NULL);
|
|
g_return_val_if_fail (impl != NULL, NULL);
|
|
g_return_val_if_fail (size != 0, NULL);
|
|
|
|
info = g_slice_new (GstMetaInfo);
|
|
info->api = g_quark_from_string (api);
|
|
info->type = g_pointer_type_register_static (impl);
|
|
info->size = size;
|
|
info->init_func = init_func;
|
|
info->free_func = free_func;
|
|
info->copy_func = copy_func;
|
|
info->transform_func = transform_func;
|
|
|
|
GST_DEBUG ("register \"%s\" implementing \"%s\" of size %" G_GSIZE_FORMAT,
|
|
api, impl, size);
|
|
|
|
g_rw_lock_writer_lock (&lock);
|
|
g_hash_table_insert (metainfo, (gpointer) impl, (gpointer) info);
|
|
g_rw_lock_writer_unlock (&lock);
|
|
|
|
return info;
|
|
}
|
|
|
|
/**
|
|
* gst_meta_get_info:
|
|
* @impl: the name
|
|
*
|
|
* Lookup a previously registered meta info structure by its implementation name
|
|
* @impl.
|
|
*
|
|
* Returns: (transfer none): a #GstMetaInfo with @impl, or #NULL when no such
|
|
* metainfo exists.
|
|
*/
|
|
const GstMetaInfo *
|
|
gst_meta_get_info (const gchar * impl)
|
|
{
|
|
GstMetaInfo *info;
|
|
|
|
g_return_val_if_fail (impl != NULL, NULL);
|
|
|
|
g_rw_lock_reader_lock (&lock);
|
|
info = g_hash_table_lookup (metainfo, impl);
|
|
g_rw_lock_reader_unlock (&lock);
|
|
|
|
return info;
|
|
}
|