gstreamer/gst/gstmeta.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstmeta.c: Metadata subsystem for describing buffer properties
*
* 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 "gstmeta.h"
#include "gsttrace.h"
/**
* gst_meta_new_size:
* @size: the size of the new meta data
*
* Create a new metadata object with a given size
*
* Returns: new meta object
*/
GstMeta*
gst_meta_new_size (gint size)
{
GstMeta *meta;
meta = g_malloc0 (size);
gst_meta_ref (meta);
return meta;
}
/**
* gst_meta_ref:
* @meta: the meta object to ref
*
* increases the refcount of a meta object
*/
void
gst_meta_ref (GstMeta *meta)
{
g_return_if_fail (meta != NULL);
gst_trace_add_entry (NULL, 0, meta, "ref meta");
#ifdef HAVE_ATOMIC_H
atomic_inc (&(meta->refcount));
#else
meta->refcount++;
#endif
}
/**
* gst_meta_unref:
* @meta: the meta object to unref
*
* decreases the refcount of a meta object. if the refcount is zero, the
* meta object is freed.
*/
void
gst_meta_unref (GstMeta *meta)
{
gint zero;
g_return_if_fail (meta != NULL);
gst_trace_add_entry (NULL, 0, meta, "unref meta");
#ifdef HAVE_ATOMIC_H
zero = atomic_dec_and_test (&(meta->refcount));
#else
meta->refcount--;
zero = (meta->refcount == 0);
#endif
if (zero) {
// gst_trace_add_entry(NULL,0,meta,"destroy meta");
g_free (meta);
// g_print("freeing metadata\n");
}
}
/**
* gst_meta_cow:
* @meta: the meta object prepare for write
*
* prepares a meta object for writing. A copy of the meta
* object is returned if needed.
*
* Returns: the meta object or a copy.
*/
GstMeta*
gst_meta_cow (GstMeta *meta)
{
g_return_val_if_fail (meta != NULL, NULL);
return NULL;
}