/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wim.taymans@chello.be>
 *
 * gstevent.h: Header for GstEvent subsystem
 *
 * 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_EVENT_H__
#define __GST_EVENT_H__

#include <gst/gsttypes.h>
#include <gst/gstelement.h>
#include <gst/gstobject.h>
#include <gst/gstdata.h>
#include <gst/gstcaps.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef enum {
  GST_EVENT_UNKNOWN,
  /* horizontal events */
  GST_EVENT_EOS,
  GST_EVENT_FLUSH,
  GST_EVENT_EMPTY,
  GST_EVENT_SEEK,
  GST_EVENT_DISCONTINUOUS,
  /* vertical events */
  GST_EVENT_INFO,
  GST_EVENT_ERROR,
  GST_EVENT_STATE_CHANGE,
} GstEventType;

extern GType _gst_event_type;

#define GST_TYPE_EVENT		(_gst_event_type)
#define GST_EVENT(event)	((GstEvent*)(event))
#define GST_IS_EVENT(event)	(GST_DATA_TYPE(event) == GST_TYPE_EVENT)

#define GST_EVENT_TYPE(event)		(GST_EVENT(event)->type)
#define GST_EVENT_TIMESTAMP(event)	(GST_EVENT(event)->timestamp)
#define GST_EVENT_SRC(event)		(GST_EVENT(event)->src)

/* seek events */
typedef enum {
  GST_SEEK_ANY,
  GST_SEEK_TIMEOFFSET,
  GST_SEEK_BYTEOFFSET
} GstSeekType;

#define GST_EVENT_SEEK_TYPE(event)	(GST_EVENT(event)->event_data.seek.type)
#define GST_EVENT_SEEK_OFFSET(event)	(GST_EVENT(event)->event_data.seek.offset)
#define GST_EVENT_SEEK_FLUSH(event)	(GST_EVENT(event)->event_data.seek.flush)

#define GST_EVENT_INFO_PROPS(event)	(GST_EVENT(event)->event_data.info.props)

#define GST_EVENT_STATE_OLD(event)	(GST_EVENT(event)->event_data.state.old_state)
#define GST_EVENT_STATE_NEW(event)	(GST_EVENT(event)->event_data.state.new_state)


struct _GstEvent {
  GstData data;

  GstEventType  type;
  guint64	timestamp;
  GstObject	*src;

  union {
    struct {
      GstSeekType type;
      guint64     offset;
      gboolean	  flush;
    } seek;
    struct {
      GstProps *props;
    } info;
    struct {
      GstElementState old_state;
      GstElementState new_state;
    } state;
  } event_data;
};

void 		_gst_event_initialize 	(void);
	
GstEvent*	gst_event_new	        (GstEventType type);
void		gst_event_free 		(GstEvent* event);

/* seek events */
GstEvent*	gst_event_new_seek	(GstSeekType type, guint64 offset, gboolean flush);

/* flush events */
#define		gst_event_new_flush()	gst_event_new(GST_EVENT_FLUSH)

/* info events */
GstEvent*	gst_event_new_info	(const gchar *firstname, ...);

/* state change events */
GstEvent*	gst_event_new_state_change (GstElementState old, GstElementState state);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __GST_EVENT_H__ */