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8468dadc77
Add first implementation of arbitrary buffer metadata. We use a simple linked linked of slice allocated metadata chunks. Future implementations could use something more performant. Add get, remove, iterate methods to handle the metadata.
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/* GStreamer
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* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.com>
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*
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* gstbuffermeta.c: Buffer 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:gstbuffermeta
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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 "gstbuffermeta.h"
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#include "gstbuffer.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 GStaticRWLock lock = G_STATIC_RW_LOCK_INIT;
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void
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_gst_buffer_meta_init (void)
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{
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metainfo = g_hash_table_new (g_str_hash, g_str_equal);
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}
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/**
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* gst_buffer_meta_register_info:
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* @info: a #GstBufferMetaInfo
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*
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* Register a #GstBufferMetaInfo. The same @info can be retrieved later with
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* gst_buffer_meta_get_info() by using the name as the key.
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*
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* Returns: a #GstBufferMetaInfo that can be used to access buffer metadata.
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*/
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const GstBufferMetaInfo *
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gst_buffer_meta_register_info (const GstBufferMetaInfo * info)
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{
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g_return_val_if_fail (info != NULL, NULL);
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g_return_val_if_fail (info->name != NULL, NULL);
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g_return_val_if_fail (info->size != 0, NULL);
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GST_DEBUG ("register \"%s\" of size %" G_GSIZE_FORMAT, info->name,
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info->size);
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g_static_rw_lock_writer_lock (&lock);
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g_hash_table_insert (metainfo, (gpointer) info->name, (gpointer) info);
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g_static_rw_lock_writer_unlock (&lock);
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return info;
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}
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/**
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* gst_buffer_meta_get_info:
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* @name: the name
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*
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* Lookup a previously registered meta info structure by its @name.
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*
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* Returns: a #GstBufferMetaInfo with @name or #NULL when no such metainfo
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* exists.
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*/
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const GstBufferMetaInfo *
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gst_buffer_meta_get_info (const gchar * name)
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{
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GstBufferMetaInfo *info;
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g_return_val_if_fail (name != NULL, NULL);
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g_static_rw_lock_reader_lock (&lock);
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info = g_hash_table_lookup (metainfo, name);
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g_static_rw_lock_reader_unlock (&lock);
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return info;
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}
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