gst/gstclock.h

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gstclock.h: Header for clock 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_CLOCK_H__
#define __GST_CLOCK_H__

#include <gst/gstobject.h>

G_BEGIN_DECLS

/* --- standard type macros --- */
#define GST_TYPE_CLOCK  		(gst_clock_get_type ())
#define GST_CLOCK(clock) 		(G_TYPE_CHECK_INSTANCE_CAST ((clock), GST_TYPE_CLOCK, GstClock))
#define GST_IS_CLOCK(clock)  		(G_TYPE_CHECK_INSTANCE_TYPE ((clock), GST_TYPE_CLOCK))
#define GST_CLOCK_CLASS(cclass)  	(G_TYPE_CHECK_CLASS_CAST ((cclass), GST_TYPE_CLOCK, GstClockClass))
#define GST_IS_CLOCK_CLASS(cclass) 	(G_TYPE_CHECK_CLASS_TYPE ((cclass), GST_TYPE_CLOCK))
#define GST_CLOCK_GET_CLASS(clock) 	(G_TYPE_INSTANCE_GET_CLASS ((clock), GST_TYPE_CLOCK, GstClockClass))
	
typedef guint64 	GstClockTime;
typedef gint64 		GstClockTimeDiff;
typedef gpointer 	GstClockID;

#define GST_CLOCK_TIME_NONE  		((GstClockTime)-1)
#define GST_CLOCK_TIME_IS_VALID(time)	((time) != GST_CLOCK_TIME_NONE)

#define GST_SECOND  ((guint64) G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
#define GST_MSECOND ((guint64) GST_SECOND / G_GINT64_CONSTANT (1000))
#define GST_USECOND ((guint64) GST_SECOND / G_GINT64_CONSTANT (1000000))
#define GST_NSECOND ((guint64) GST_SECOND / G_GINT64_CONSTANT (1000000000))

#define GST_CLOCK_DIFF(s, e) 		(GstClockTimeDiff)((s) - (e))
#define GST_TIMEVAL_TO_TIME(tv)		((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
#define GST_TIME_TO_TIMEVAL(t,tv)			\
G_STMT_START { 						\
  (tv).tv_sec  =  (t) / GST_SECOND;			\
  (tv).tv_usec = ((t) / GST_USECOND) % GST_MSECOND;	\
} G_STMT_END

#define GST_CLOCK_ENTRY_TRACE_NAME "GstClockEntry"

typedef struct _GstClockEntry 	GstClockEntry;
typedef struct _GstClock 	GstClock;
typedef struct _GstClockClass 	GstClockClass;

/* --- prototype for async callbacks --- */
typedef gboolean 	(*GstClockCallback) 	(GstClock *clock, GstClockTime time, 
						 GstClockID id, gpointer user_data);

typedef enum {
  /* --- protected --- */
  GST_CLOCK_ENTRY_OK,
  GST_CLOCK_ENTRY_EARLY,
  GST_CLOCK_ENTRY_RESTART
} GstClockEntryStatus;

typedef enum {
  /* --- protected --- */
  GST_CLOCK_ENTRY_SINGLE,
  GST_CLOCK_ENTRY_PERIODIC
} GstClockEntryType;

#define GST_CLOCK_ENTRY(entry)		((GstClockEntry *)(entry))
#define GST_CLOCK_ENTRY_CLOCK(entry)	((entry)->clock)
#define GST_CLOCK_ENTRY_TYPE(entry)	((entry)->type)
#define GST_CLOCK_ENTRY_TIME(entry)	((entry)->time)
#define GST_CLOCK_ENTRY_INTERVAL(entry)	((entry)->interval)
#define GST_CLOCK_ENTRY_STATUS(entry)	((entry)->status)

struct _GstClockEntry {
  /* --- protected --- */
  GstClock	 	*clock;
  GstClockEntryType 	 type;
  GstClockTime 		 time;
  GstClockTime 		 interval;
  GstClockEntryStatus 	 status;
  GstClockCallback 	 func;
  gpointer		 user_data;
};

typedef enum
{
  GST_CLOCK_STOPPED 	= 0,
  GST_CLOCK_TIMEOUT 	= 1,
  GST_CLOCK_EARLY 	= 2,
  GST_CLOCK_ERROR 	= 3,
  GST_CLOCK_UNSUPPORTED	= 4
} GstClockReturn;

typedef enum
{
  GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC     = (1 << 1),
  GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC    = (1 << 2),
  GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC   = (1 << 3),
  GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC  = (1 << 4),
  GST_CLOCK_FLAG_CAN_SET_RESOLUTION     = (1 << 5),
  GST_CLOCK_FLAG_CAN_SET_SPEED          = (1 << 6)
} GstClockFlags;

#define GST_CLOCK_FLAGS(clock)  (GST_CLOCK(clock)->flags)

struct _GstClock {
  GstObject 	 object;

  GstClockFlags	 flags;

  /* --- protected --- */
  GstClockTime	 start_time;
  GstClockTime	 last_time;
  gint64	 max_diff;

  /* --- private --- */
  gboolean 	 accept_discont;
  gdouble 	 speed;
  guint64	 resolution;
  gboolean 	 active;
  GList		*entries;
  GMutex	*active_mutex;
  GCond		*active_cond;
  gboolean	 stats;

  gpointer 	 dummy[4];
};

struct _GstClockClass {
  GstObjectClass        parent_class;

  /* vtable */
  gdouble               (*change_speed)         (GstClock *clock,
		                                 gdouble oldspeed, gdouble newspeed);
  gdouble               (*get_speed)            (GstClock *clock);
  guint64               (*change_resolution)    (GstClock *clock, guint64 old_resolution,
  						 guint64 new_resolution);
  guint64               (*get_resolution)       (GstClock *clock);

  GstClockTime 		(*get_internal_time)	(GstClock *clock);

  /* waiting on an ID */
  GstClockEntryStatus   (*wait)        		(GstClock *clock, GstClockEntry *entry);
  GstClockEntryStatus   (*wait_async)           (GstClock *clock, GstClockEntry *entry);
  void                  (*unschedule)        	(GstClock *clock, GstClockEntry *entry);
  void                  (*unlock)            	(GstClock *clock, GstClockEntry *entry);
};

GType           	gst_clock_get_type 		(void);

gdouble			gst_clock_set_speed		(GstClock *clock, gdouble speed);
gdouble 		gst_clock_get_speed		(GstClock *clock);

guint64			gst_clock_set_resolution	(GstClock *clock, guint64 resolution);
guint64			gst_clock_get_resolution	(GstClock *clock);

void 			gst_clock_set_active		(GstClock *clock, gboolean active);
gboolean 		gst_clock_is_active		(GstClock *clock);
void 			gst_clock_reset			(GstClock *clock);
gboolean		gst_clock_handle_discont	(GstClock *clock, guint64 time);

GstClockTime		gst_clock_get_time		(GstClock *clock);

GstClockID		gst_clock_get_next_id		(GstClock *clock);

/* creating IDs that can be used to get notifications */
GstClockID		gst_clock_new_single_shot_id	(GstClock *clock, 
							 GstClockTime time); 
GstClockID		gst_clock_new_periodic_id	(GstClock *clock, 
							 GstClockTime start_time,
		 					 GstClockTime interval); 

/* operations on IDs */
GstClockTime		gst_clock_id_get_time		(GstClockID id);
GstClockReturn		gst_clock_id_wait		(GstClockID id, 
							 GstClockTimeDiff *jitter);
GstClockReturn		gst_clock_id_wait_async		(GstClockID id, 
						 	 GstClockCallback func, 
							 gpointer user_data);
void 			gst_clock_id_unschedule		(GstClockID id);
void			gst_clock_id_unlock		(GstClockID id);
void			gst_clock_id_free		(GstClockID id);

G_END_DECLS

#endif /* __GST_CLOCK_H__ */