gstreamer/gst/gstdata.h

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstdata.h: Header for GstData objects (used for data passing)
*
* 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.
*/
#ifndef __GST_DATA_H__
#define __GST_DATA_H__
#include <glib-object.h>
#include <gst/gstatomic.h>
#include <gst/gsttypes.h>
G_BEGIN_DECLS
/* type */
#define GST_DATA(data) ((GstData*)(data))
#define GST_DATA_TYPE(data) (GST_DATA(data)->type)
/* flags */
#define GST_DATA_FLAGS(data) (GST_DATA(data)->flags)
#define GST_DATA_FLAG_SHIFT(flag) (1<<(flag))
#define GST_DATA_FLAG_IS_SET(data,flag) (GST_DATA_FLAGS(data) & (1<<(flag)))
#define GST_DATA_FLAG_SET(data,flag) G_STMT_START{ (GST_DATA_FLAGS(data) |= (1<<(flag))); }G_STMT_END
#define GST_DATA_FLAG_UNSET(data,flag) G_STMT_START{ (GST_DATA_FLAGS(data) &= ~(1<<(flag))); }G_STMT_END
typedef struct _GstData GstData;
typedef void (*GstDataFreeFunction) (GstData *data);
typedef GstData* (*GstDataCopyFunction) (const GstData *data);
typedef enum
{
GST_DATA_READONLY = 1,
/* insert more */
GST_DATA_FLAG_LAST = 8
} GstDataFlags;
/* refcount */
#define GST_DATA_REFCOUNT(data) ((GST_DATA(data))->refcount)
#define GST_DATA_REFCOUNT_VALUE(data) (gst_atomic_int_read (&(GST_DATA(data))->refcount))
/* copy/free functions */
#define GST_DATA_COPY_FUNC(data) (GST_DATA(data)->copy)
#define GST_DATA_FREE_FUNC(data) (GST_DATA(data)->free)
struct _GstData {
GType type;
/* refcounting */
GstAtomicInt refcount;
guint16 flags;
/* utility function pointers, can override default */
GstDataFreeFunction free; /* free the data */
GstDataCopyFunction copy; /* copy the data */
GST_STRUCT_PADDING
};
/* function used by subclasses only */
void gst_data_init (GstData *data, GType type, guint16 flags,
GstDataFreeFunction free,
GstDataCopyFunction copy);
void gst_data_dispose (GstData *data);
void gst_data_copy_into (const GstData *data, GstData *target);
/* basic operations on data */
GstData* gst_data_copy (const GstData *data);
gboolean gst_data_is_writable (GstData *data);
GstData* gst_data_copy_on_write (GstData *data);
void gst_data_free (GstData *data);
/* reference counting */
GstData* gst_data_ref (GstData* data);
GstData* gst_data_ref_by_count (GstData* data, gint count);
void gst_data_unref (GstData* data);
G_END_DECLS
#endif /* __GST_DATA_H__ */