2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
6 * gstclock.h: Header for clock subsystem
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
24 #ifndef __GST_CLOCK_H__
25 #define __GST_CLOCK_H__
29 /* --- standard type macros --- */
30 #define GST_TYPE_CLOCK (gst_clock_get_type ())
31 #define GST_CLOCK(clock) (G_TYPE_CHECK_INSTANCE_CAST ((clock), GST_TYPE_CLOCK, GstClock))
32 #define GST_IS_CLOCK(clock) (G_TYPE_CHECK_INSTANCE_TYPE ((clock), GST_TYPE_CLOCK))
33 #define GST_CLOCK_CLASS(cclass) (G_TYPE_CHECK_CLASS_CAST ((cclass), GST_TYPE_CLOCK, GstClockClass))
34 #define GST_IS_CLOCK_CLASS(cclass) (G_TYPE_CHECK_CLASS_TYPE ((cclass), GST_TYPE_CLOCK))
35 #define GST_CLOCK_GET_CLASS(clock) (G_TYPE_INSTANCE_GET_CLASS ((clock), GST_TYPE_CLOCK, GstClockClass))
36 #define GST_CLOCK_CAST(clock) ((GstClock*)(clock))
41 * A datatype to hold a time, measured in nanoseconds.
43 typedef guint64 GstClockTime;
46 * GST_TYPE_CLOCK_TIME:
48 * The #GType of a #GstClockTime.
50 #define GST_TYPE_CLOCK_TIME G_TYPE_UINT64
55 * A datatype to hold a time difference, measured in nanoseconds.
57 typedef gint64 GstClockTimeDiff;
61 * A datatype to hold the handle to an outstanding sync or async clock callback.
63 typedef gpointer GstClockID;
66 * GST_CLOCK_TIME_NONE: (value 18446744073709551615) (type GstClockTime)
68 * Constant to define an undefined clock time.
70 #define GST_CLOCK_TIME_NONE ((GstClockTime) -1)
72 * GST_CLOCK_TIME_IS_VALID:
73 * @time: clock time to validate
75 * Tests if a given #GstClockTime represents a valid defined time.
77 #define GST_CLOCK_TIME_IS_VALID(time) (((GstClockTime)(time)) != GST_CLOCK_TIME_NONE)
80 * GST_CLOCK_STIME_NONE: (value -9223372036854775808) (type GstClockTimeDiff)
82 * Constant to define an undefined clock time.
84 #define GST_CLOCK_STIME_NONE G_MININT64
86 * GST_CLOCK_STIME_IS_VALID:
87 * @time: signed clock time to validate
89 * Tests if a given #GstClockTimeDiff of #gint64 represents a valid defined time.
93 #define GST_CLOCK_STIME_IS_VALID(time) (((GstClockTimeDiff)(time)) != GST_CLOCK_STIME_NONE)
95 /* FIXME: still need to explicitly force types on the defines below */
97 * GST_SECOND: (value 1000000000) (type GstClockTime)
99 * Constant that defines one GStreamer second.
101 #define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
103 * GST_MSECOND: (value 1000000) (type GstClockTime)
105 * Constant that defines one GStreamer millisecond.
107 #define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
109 * GST_USECOND: (value: 1000) (type GstClockTime)
111 * Constant that defines one GStreamer microsecond.
113 #define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
115 * GST_NSECOND: (value 1) (type GstClockTime)
117 * Constant that defines one GStreamer nanosecond
119 #define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
123 * GST_TIME_AS_SECONDS:
126 * Convert a #GstClockTime to seconds.
128 #define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
130 * GST_TIME_AS_MSECONDS:
133 * Convert a #GstClockTime to milliseconds (1/1000 of a second).
135 #define GST_TIME_AS_MSECONDS(time) ((time) / G_GINT64_CONSTANT (1000000))
137 * GST_TIME_AS_USECONDS:
140 * Convert a #GstClockTime to microseconds (1/1000000 of a second).
142 #define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
144 * GST_TIME_AS_NSECONDS:
147 * Convert a #GstClockTime to nanoseconds (1/1000000000 of a second).
149 #define GST_TIME_AS_NSECONDS(time) (time)
154 * @e: the second time
156 * Calculate a difference between two clock times as a #GstClockTimeDiff.
157 * The difference is calculated as @e - @s.
159 #define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
162 * GST_TIMEVAL_TO_TIME:
163 * @tv: the timeval to convert
165 * Convert a #GTimeVal to a #GstClockTime.
167 #define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
170 * GST_TIME_TO_TIMEVAL:
171 * @t: The #GstClockTime to convert
172 * @tv: The target timeval
174 * Convert a #GstClockTime to a #GTimeVal
176 * <note>on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
177 * which is about 68 years. Expect trouble if you want to schedule stuff
178 * in your pipeline for 2038.</note>
180 #define GST_TIME_TO_TIMEVAL(t,tv) \
182 g_assert ("Value of time " #t " is out of timeval's range" && \
183 ((t) / GST_SECOND) < G_MAXLONG); \
184 (tv).tv_sec = (glong) (((GstClockTime) (t)) / GST_SECOND); \
185 (tv).tv_usec = (glong) ((((GstClockTime) (t)) - \
186 ((GstClockTime) (tv).tv_sec) * GST_SECOND) \
191 * GST_TIMESPEC_TO_TIME:
192 * @ts: the timespec to convert
194 * Convert a struct timespec (see man pselect) to a #GstClockTime.
196 #define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
198 * GST_TIME_TO_TIMESPEC:
199 * @t: The #GstClockTime to convert
200 * @ts: The target timespec
202 * Convert a #GstClockTime to a struct timespec (see man pselect)
204 #define GST_TIME_TO_TIMESPEC(t,ts) \
206 g_assert ("Value of time " #t " is out of timespec's range" && \
207 ((t) / GST_SECOND) < G_MAXLONG); \
208 (ts).tv_sec = (glong) ((t) / GST_SECOND); \
209 (ts).tv_nsec = (glong) (((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND); \
212 /* timestamp debugging macros */
216 * A string that can be used in printf-like format strings to display a
217 * #GstClockTime value in h:m:s format. Use GST_TIME_ARGS() to construct
218 * the matching arguments.
222 * printf("%" GST_TIME_FORMAT "\n", GST_TIME_ARGS(ts));
225 #define GST_TIME_FORMAT "u:%02u:%02u.%09u"
228 * @t: a #GstClockTime
230 * Format @t for the #GST_TIME_FORMAT format string. Note: @t will be
231 * evaluated more than once.
233 #define GST_TIME_ARGS(t) \
234 GST_CLOCK_TIME_IS_VALID (t) ? \
235 (guint) (((GstClockTime)(t)) / (GST_SECOND * 60 * 60)) : 99, \
236 GST_CLOCK_TIME_IS_VALID (t) ? \
237 (guint) ((((GstClockTime)(t)) / (GST_SECOND * 60)) % 60) : 99, \
238 GST_CLOCK_TIME_IS_VALID (t) ? \
239 (guint) ((((GstClockTime)(t)) / GST_SECOND) % 60) : 99, \
240 GST_CLOCK_TIME_IS_VALID (t) ? \
241 (guint) (((GstClockTime)(t)) % GST_SECOND) : 999999999
245 * A string that can be used in printf-like format strings to display a signed
246 * #GstClockTimeDiff or #gint64 value in h:m:s format. Use GST_TIME_ARGS() to
247 * construct the matching arguments.
251 * printf("%" GST_STIME_FORMAT "\n", GST_STIME_ARGS(ts));
256 #define GST_STIME_FORMAT "d:%02u:%02u.%09u"
259 * @t: a #GstClockTimeDiff or #gint64
261 * Format @t for the #GST_STIME_FORMAT format string. Note: @t will be
262 * evaluated more than once.
266 #define GST_STIME_ARGS(t) \
267 GST_CLOCK_STIME_IS_VALID (t) ? \
268 (gint) ((GstClockTimeDiff)(t) / (GST_SECOND * 60 * 60)) : -99, \
269 GST_CLOCK_STIME_IS_VALID (t) ? \
270 (guint) ((((GstClockTime)ABS(t)) / (GST_SECOND * 60)) % 60) : 99, \
271 GST_CLOCK_STIME_IS_VALID (t) ? \
272 (guint) ((((GstClockTime)ABS(t)) / GST_SECOND) % 60) : 99, \
273 GST_CLOCK_STIME_IS_VALID (t) ? \
274 (guint) (((GstClockTime)ABS(t)) % GST_SECOND) : 999999999
276 typedef struct _GstClockEntry GstClockEntry;
277 typedef struct _GstClock GstClock;
278 typedef struct _GstClockClass GstClockClass;
279 typedef struct _GstClockPrivate GstClockPrivate;
281 /* --- prototype for async callbacks --- */
284 * @clock: The clock that triggered the callback
285 * @time: The time it was triggered
286 * @id: The #GstClockID that expired
287 * @user_data: user data passed in the gst_clock_id_wait_async() function
289 * The function prototype of the callback.
291 * Returns: %TRUE or %FALSE (currently unused)
293 typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
294 GstClockID id, gpointer user_data);
297 * @GST_CLOCK_OK: The operation succeeded.
298 * @GST_CLOCK_EARLY: The operation was scheduled too late.
299 * @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
300 * @GST_CLOCK_BUSY: The ClockID is busy
301 * @GST_CLOCK_BADTIME: A bad time was provided to a function.
302 * @GST_CLOCK_ERROR: An error occurred
303 * @GST_CLOCK_UNSUPPORTED: Operation is not supported
304 * @GST_CLOCK_DONE: The ClockID is done waiting
306 * The return value of a clock operation.
312 GST_CLOCK_UNSCHEDULED = 2,
314 GST_CLOCK_BADTIME = 4,
316 GST_CLOCK_UNSUPPORTED = 6,
322 * @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
323 * @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
325 * The type of the clock entry
328 GST_CLOCK_ENTRY_SINGLE,
329 GST_CLOCK_ENTRY_PERIODIC
334 * @entry: the entry to cast
336 * Cast to a clock entry
338 #define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
340 * GST_CLOCK_ENTRY_CLOCK:
341 * @entry: the entry to query
343 * Get the owner clock of the entry
345 #define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
347 * GST_CLOCK_ENTRY_TYPE:
348 * @entry: the entry to query
350 * Get the type of the clock entry
352 #define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
354 * GST_CLOCK_ENTRY_TIME:
355 * @entry: the entry to query
357 * Get the requested time of this entry
359 #define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
361 * GST_CLOCK_ENTRY_INTERVAL:
362 * @entry: the entry to query
364 * Get the interval of this periodic entry
366 #define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
368 * GST_CLOCK_ENTRY_STATUS:
369 * @entry: the entry to query
371 * The status of the entry
373 #define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
377 * @refcount: reference counter (read-only)
379 * All pending timeouts or periodic notifies are converted into
381 * Note that GstClockEntry should be treated as an opaque structure. It must
382 * not be extended or allocated using a custom allocator.
384 struct _GstClockEntry {
388 GstClockEntryType type;
390 GstClockTime interval;
391 GstClockReturn status;
392 GstClockCallback func;
394 GDestroyNotify destroy_data;
395 gboolean unscheduled;
399 gpointer _gst_reserved[GST_PADDING];
402 #include <gst/gstobject.h>
406 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
407 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
408 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
409 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
410 * @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
411 * @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
412 * @GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC: clock needs to be synced before it can be used
414 * @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
416 * The capabilities of this clock
419 GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
420 GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
421 GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
422 GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
423 GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
424 GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
425 GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC = (GST_OBJECT_FLAG_LAST << 6),
427 GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
432 * @clock: the clock to query
434 * Gets the #GstClockFlags clock flags.
436 #define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
441 * #GstClock base structure. The values of this structure are
442 * protected for subclasses, use the methods to use the #GstClock.
448 GstClockPrivate *priv;
450 gpointer _gst_reserved[GST_PADDING];
455 * @parent_class: the parent class structure
456 * @change_resolution: change the resolution of the clock. Not all values might
457 * be acceptable. The new resolution should be returned.
458 * @get_resolution: get the resolution of the clock.
459 * @get_internal_time: get the internal unadjusted time of the clock.
460 * implement @wait_jitter instead.
461 * @wait: perform a blocking wait on the given #GstClockEntry and return
463 * @wait_async: perform an asynchronous wait for the given #GstClockEntry.
464 * @unschedule: unblock a blocking or async wait operation.
466 * GStreamer clock class. Override the vmethods to implement the clock
469 struct _GstClockClass {
470 GstObjectClass parent_class;
474 GstClockTime (*change_resolution) (GstClock *clock,
475 GstClockTime old_resolution,
476 GstClockTime new_resolution);
477 GstClockTime (*get_resolution) (GstClock *clock);
479 GstClockTime (*get_internal_time) (GstClock *clock);
481 /* waiting on an ID */
482 GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
483 GstClockTimeDiff *jitter);
484 GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
485 void (*unschedule) (GstClock *clock, GstClockEntry *entry);
488 gpointer _gst_reserved[GST_PADDING];
491 GType gst_clock_get_type (void);
493 GstClockTime gst_clock_set_resolution (GstClock *clock,
494 GstClockTime resolution);
495 GstClockTime gst_clock_get_resolution (GstClock *clock);
497 GstClockTime gst_clock_get_time (GstClock *clock);
498 void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
499 GstClockTime external,
500 GstClockTime rate_num,
501 GstClockTime rate_denom);
502 void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
503 GstClockTime *external,
504 GstClockTime *rate_num,
505 GstClockTime *rate_denom);
507 /* master/slave clocks */
508 gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
509 GstClock* gst_clock_get_master (GstClock *clock);
511 void gst_clock_set_timeout (GstClock *clock,
512 GstClockTime timeout);
513 GstClockTime gst_clock_get_timeout (GstClock *clock);
515 gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
516 GstClockTime master, gdouble *r_squared);
518 gboolean gst_clock_add_observation_unapplied (GstClock *clock, GstClockTime slave,
519 GstClockTime master, gdouble *r_squared,
520 GstClockTime *internal,
521 GstClockTime *external,
522 GstClockTime *rate_num,
523 GstClockTime *rate_denom);
525 /* getting and adjusting internal/external time */
526 GstClockTime gst_clock_get_internal_time (GstClock *clock);
527 GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
528 GstClockTime gst_clock_adjust_with_calibration (GstClock *clock,
529 GstClockTime internal_target,
530 GstClockTime cinternal,
531 GstClockTime cexternal,
533 GstClockTime cdenom);
534 GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
536 /* waiting for, signalling and checking for synchronization */
537 gboolean gst_clock_wait_for_sync (GstClock * clock, GstClockTime timeout);
538 gboolean gst_clock_is_synced (GstClock * clock);
540 /* to be used by subclasses only */
541 void gst_clock_set_synced (GstClock * clock, gboolean synced);
543 /* creating IDs that can be used to get notifications */
544 GstClockID gst_clock_new_single_shot_id (GstClock *clock,
546 GstClockID gst_clock_new_periodic_id (GstClock *clock,
547 GstClockTime start_time,
548 GstClockTime interval);
550 /* reference counting */
551 GstClockID gst_clock_id_ref (GstClockID id);
552 void gst_clock_id_unref (GstClockID id);
554 /* operations on IDs */
555 gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
557 GstClockTime gst_clock_id_get_time (GstClockID id);
558 GstClockReturn gst_clock_id_wait (GstClockID id,
559 GstClockTimeDiff *jitter);
560 GstClockReturn gst_clock_id_wait_async (GstClockID id,
561 GstClockCallback func,
563 GDestroyNotify destroy_data);
564 void gst_clock_id_unschedule (GstClockID id);
566 gboolean gst_clock_single_shot_id_reinit (GstClock * clock,
569 gboolean gst_clock_periodic_id_reinit (GstClock * clock,
571 GstClockTime start_time,
572 GstClockTime interval);
576 #endif /* __GST_CLOCK_H__ */