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