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6b22a63f1b
Flesh out the transform method. Add a type and extra info to the transform function so that implementation can transform the metadata. Remove the copy function and replace with the more generic transform.
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
/* GStreamer
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* Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
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*
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* gstmeta.c: metadata operations
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstmeta
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* @short_description: Buffer metadata
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*
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* Last reviewed on December 17th, 2009 (0.10.26)
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*/
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#include "gst_private.h"
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#include "gstbuffer.h"
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#include "gstmeta.h"
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#include "gstinfo.h"
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#include "gstutils.h"
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static GHashTable *metainfo = NULL;
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static GRWLock lock;
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GQuark _gst_meta_transform_copy;
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void
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_priv_gst_meta_initialize (void)
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{
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g_rw_lock_init (&lock);
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metainfo = g_hash_table_new (g_str_hash, g_str_equal);
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_gst_meta_transform_copy = g_quark_from_static_string ("copy");
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}
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/**
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* gst_meta_register:
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* @api: the name of the #GstMeta API
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* @impl: the name of the #GstMeta implementation
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* @size: the size of the #GstMeta structure
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* @init_func: a #GstMetaInitFunction
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* @free_func: a #GstMetaFreeFunction
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* @transform_func: a #GstMetaTransformFunction
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*
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* Register a new #GstMeta implementation.
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*
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* The same @info can be retrieved later with gst_meta_get_info() by using
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* @impl as the key.
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*
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* Returns: (transfer none): a #GstMetaInfo that can be used to access metadata.
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*/
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const GstMetaInfo *
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gst_meta_register (const gchar * api, const gchar * impl, gsize size,
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GstMetaInitFunction init_func, GstMetaFreeFunction free_func,
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GstMetaTransformFunction transform_func)
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{
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GstMetaInfo *info;
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g_return_val_if_fail (api != NULL, NULL);
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g_return_val_if_fail (impl != NULL, NULL);
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g_return_val_if_fail (size != 0, NULL);
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info = g_slice_new (GstMetaInfo);
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info->api = g_quark_from_string (api);
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info->type = g_pointer_type_register_static (impl);
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info->size = size;
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info->init_func = init_func;
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info->free_func = free_func;
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info->transform_func = transform_func;
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GST_DEBUG ("register \"%s\" implementing \"%s\" of size %" G_GSIZE_FORMAT,
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api, impl, size);
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g_rw_lock_writer_lock (&lock);
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g_hash_table_insert (metainfo, (gpointer) impl, (gpointer) info);
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g_rw_lock_writer_unlock (&lock);
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return info;
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}
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/**
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* gst_meta_get_info:
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* @impl: the name
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*
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* Lookup a previously registered meta info structure by its implementation name
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* @impl.
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*
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* Returns: (transfer none): a #GstMetaInfo with @impl, or #NULL when no such
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* metainfo exists.
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*/
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const GstMetaInfo *
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gst_meta_get_info (const gchar * impl)
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{
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GstMetaInfo *info;
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g_return_val_if_fail (impl != NULL, NULL);
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g_rw_lock_reader_lock (&lock);
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info = g_hash_table_lookup (metainfo, impl);
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g_rw_lock_reader_unlock (&lock);
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return info;
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}
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