gstreamer/gst/gsttimecache.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wim.taymans@chello.be>
 *
 * gsttimecache.h: Header for GstTimeCache
 *
 * 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_TIME_CACHE_H__
#define __GST_TIME_CACHE_H__

#include <gst/gstobject.h>

G_BEGIN_DECLS

#define GST_TYPE_TIME_CACHE		(gst_time_cache_get_type ())
#define GST_TIME_CACHE(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_TIME_CACHE, GstTimeCache))
#define GST_TIME_CACHE_CLASS(klass)	(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_TIME_CACHE, GstTimeCacheClass))
#define GST_IS_TIME_CACHE(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_TIME_CACHE))
#define GST_IS_TIME_CACHE_CLASS(obj)	(GST_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_TIME_CACHE))

typedef struct _GstTimeCacheEntry GstTimeCacheEntry;
typedef struct _GstTimeCacheGroup GstTimeCacheGroup;
typedef struct _GstTimeCache GstTimeCache;
typedef struct _GstTimeCacheClass GstTimeCacheClass;

typedef enum {
  GST_TIME_CACHE_UNKNOWN,
  GST_TIME_CACHE_CERTAIN,
  GST_TIME_CACHE_FUZZY_LOCATION,
  GST_TIME_CACHE_FUZZY_TIMESTAMP,
  GST_TIME_CACHE_FUZZY
} GstTimeCacheCertainty;

struct _GstTimeCacheEntry {
  guint64 location;
  gint64 timestamp;
};

struct _GstTimeCacheGroup {
  /* unique ID of group in cache */
  gint groupnum;

  /* list of entries */
  GList *entries;

  /* the certainty level of the group */
  GstTimeCacheCertainty certainty;

  /* peer group that contains more certain entries */
  gint peergroup;

  /* range variables */
  gint64 mintimestamp,maxtimestamp;
  guint64 minlocation,maxlocation;
};

struct _GstTimeCacheClass {
  GstObjectClass parent_class;
};

struct _GstTimeCache {
  GstObject		object;

  GList			*groups;
  GstTimeCacheGroup	*curgroup;
  gint			maxgroup;
};

GType			gst_time_cache_get_type		(void);
GstTimeCache*		gst_time_cache_new		(void);

gint			gst_time_cache_get_group	(GstTimeCache *tc);
gint			gst_time_cache_new_group	(GstTimeCache *tc);
gboolean		gst_time_cache_set_group	(GstTimeCache *tc, gint groupnum);

void			gst_time_cache_set_certainty	(GstTimeCache *tc, GstTimeCacheCertainty certainty);
GstTimeCacheCertainty	gst_time_cache_get_certainty	(GstTimeCache *tc);

void			gst_time_cache_add_entry	(GstTimeCache *tc, guint64 location, gint64 timestamp);

gboolean		gst_time_cache_find_location	(GstTimeCache *tc, guint64 location, gint64 *timestamp);
gboolean		gst_time_cache_find_timestamp	(GstTimeCache *tc, gint64 timestamp, guint64 *location);


G_END_DECLS

#endif /* __GST_TIME_CACHE_H__ */