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__
27 #include <gst/gstconfig.h>
32 /* --- standard type macros --- */
33 #define GST_TYPE_CLOCK (gst_clock_get_type ())
34 #define GST_CLOCK(clock) (G_TYPE_CHECK_INSTANCE_CAST ((clock), GST_TYPE_CLOCK, GstClock))
35 #define GST_IS_CLOCK(clock) (G_TYPE_CHECK_INSTANCE_TYPE ((clock), GST_TYPE_CLOCK))
36 #define GST_CLOCK_CLASS(cclass) (G_TYPE_CHECK_CLASS_CAST ((cclass), GST_TYPE_CLOCK, GstClockClass))
37 #define GST_IS_CLOCK_CLASS(cclass) (G_TYPE_CHECK_CLASS_TYPE ((cclass), GST_TYPE_CLOCK))
38 #define GST_CLOCK_GET_CLASS(clock) (G_TYPE_INSTANCE_GET_CLASS ((clock), GST_TYPE_CLOCK, GstClockClass))
39 #define GST_CLOCK_CAST(clock) ((GstClock*)(clock))
44 * A datatype to hold a time, measured in nanoseconds.
46 typedef guint64 GstClockTime;
49 * GST_TYPE_CLOCK_TIME:
51 * The #GType of a #GstClockTime.
53 #define GST_TYPE_CLOCK_TIME G_TYPE_UINT64
58 * A datatype to hold a time difference, measured in nanoseconds.
60 typedef gint64 GstClockTimeDiff;
64 * A datatype to hold the handle to an outstanding sync or async clock callback.
66 typedef gpointer GstClockID;
69 * GST_CLOCK_TIME_NONE: (value 18446744073709551615) (type GstClockTime)
71 * Constant to define an undefined clock time.
73 #define GST_CLOCK_TIME_NONE ((GstClockTime) -1)
75 * GST_CLOCK_TIME_IS_VALID:
76 * @time: clock time to validate
78 * Tests if a given #GstClockTime represents a valid defined time.
80 #define GST_CLOCK_TIME_IS_VALID(time) (((GstClockTime)(time)) != GST_CLOCK_TIME_NONE)
83 * GST_CLOCK_STIME_NONE: (value -9223372036854775808) (type GstClockTimeDiff)
85 * Constant to define an undefined clock time.
87 #define GST_CLOCK_STIME_NONE ((GstClockTimeDiff)G_MININT64)
89 * GST_CLOCK_STIME_IS_VALID:
90 * @time: signed clock time to validate
92 * Tests if a given #GstClockTimeDiff of #gint64 represents a valid defined time.
96 #define GST_CLOCK_STIME_IS_VALID(time) (((GstClockTimeDiff)(time)) != GST_CLOCK_STIME_NONE)
99 * GST_SECOND: (value 1000000000) (type GstClockTimeDiff)
101 * Constant that defines one GStreamer second.
103 #define GST_SECOND ((GstClockTimeDiff)(G_USEC_PER_SEC * G_GINT64_CONSTANT (1000)))
105 * GST_MSECOND: (value 1000000) (type GstClockTimeDiff)
107 * Constant that defines one GStreamer millisecond.
109 #define GST_MSECOND ((GstClockTimeDiff)(GST_SECOND / G_GINT64_CONSTANT (1000)))
111 * GST_USECOND: (value 1000) (type GstClockTimeDiff)
113 * Constant that defines one GStreamer microsecond.
115 #define GST_USECOND ((GstClockTimeDiff)(GST_SECOND / G_GINT64_CONSTANT (1000000)))
117 * GST_NSECOND: (value 1) (type GstClockTimeDiff)
119 * Constant that defines one GStreamer nanosecond
121 #define GST_NSECOND ((GstClockTimeDiff)(GST_SECOND / G_GINT64_CONSTANT (1000000000)))
125 * GST_TIME_AS_SECONDS:
128 * Converts a #GstClockTime to seconds.
130 #define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
132 * GST_TIME_AS_MSECONDS:
135 * Converts a #GstClockTime to milliseconds (1/1000 of a second).
137 #define GST_TIME_AS_MSECONDS(time) ((time) / G_GINT64_CONSTANT (1000000))
139 * GST_TIME_AS_USECONDS:
142 * Converts a #GstClockTime to microseconds (1/1000000 of a second).
144 #define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
146 * GST_TIME_AS_NSECONDS:
149 * Converts a #GstClockTime to nanoseconds (1/1000000000 of a second).
151 #define GST_TIME_AS_NSECONDS(time) (time)
156 * @e: the second time
158 * Calculates a difference between two clock times as a #GstClockTimeDiff.
159 * The difference is calculated as @e - @s.
161 #define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
164 * GST_TIMEVAL_TO_TIME:
165 * @tv: the timeval to convert
167 * Converts a GTimeVal to a #GstClockTime.
169 #define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
172 * GST_TIME_TO_TIMEVAL:
173 * @t: The #GstClockTime to convert
174 * @tv: The target timeval
176 * Converts a #GstClockTime to a GTimeVal
178 * > on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
179 * > which is about 68 years. Expect trouble if you want to schedule stuff
180 * > in your pipeline for 2038.
182 #define GST_TIME_TO_TIMEVAL(t,tv) \
184 g_assert ("Value of time " #t " is out of timeval's range" && \
185 ((t) / GST_SECOND) < G_MAXLONG); \
186 (tv).tv_sec = (glong) (((GstClockTime) (t)) / GST_SECOND); \
187 (tv).tv_usec = (glong) ((((GstClockTime) (t)) - \
188 ((GstClockTime) (tv).tv_sec) * GST_SECOND) \
193 * GST_TIMESPEC_TO_TIME:
194 * @ts: the timespec to convert
196 * Converts a struct timespec (see `man pselect`) to a #GstClockTime.
198 #define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
200 * GST_TIME_TO_TIMESPEC:
201 * @t: The #GstClockTime to convert
202 * @ts: The target timespec
204 * Converts a #GstClockTime to a struct timespec (see `man pselect`)
206 #define GST_TIME_TO_TIMESPEC(t,ts) \
208 g_assert ("Value of time " #t " is out of timespec's range" && \
209 ((t) / GST_SECOND) < G_MAXLONG); \
210 (ts).tv_sec = (glong) ((t) / GST_SECOND); \
211 (ts).tv_nsec = (glong) (((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND); \
214 /* timestamp debugging macros */
216 * GST_TIME_FORMAT: (skip):
218 * A string that can be used in printf-like format strings to display a
219 * #GstClockTime value in `h:m:s` format. Use GST_TIME_ARGS() to construct
220 * the matching arguments.
225 * printf("%" GST_TIME_FORMAT "\n", GST_TIME_ARGS(ts));
228 #define GST_TIME_FORMAT "u:%02u:%02u.%09u"
230 * GST_TIME_ARGS: (skip):
231 * @t: a #GstClockTime
233 * Formats @t for the #GST_TIME_FORMAT format string. Note: @t will be
234 * evaluated more than once.
236 #define GST_TIME_ARGS(t) \
237 GST_CLOCK_TIME_IS_VALID (t) ? \
238 (guint) (((GstClockTime)(t)) / (GST_SECOND * 60 * 60)) : 99, \
239 GST_CLOCK_TIME_IS_VALID (t) ? \
240 (guint) ((((GstClockTime)(t)) / (GST_SECOND * 60)) % 60) : 99, \
241 GST_CLOCK_TIME_IS_VALID (t) ? \
242 (guint) ((((GstClockTime)(t)) / GST_SECOND) % 60) : 99, \
243 GST_CLOCK_TIME_IS_VALID (t) ? \
244 (guint) (((GstClockTime)(t)) % GST_SECOND) : 999999999
246 * GST_STIME_FORMAT: (skip):
248 * A string that can be used in printf-like format strings to display a signed
249 * #GstClockTimeDiff or #gint64 value in `h:m:s` format. Use GST_TIME_ARGS() to
250 * construct the matching arguments.
255 * printf("%" GST_STIME_FORMAT "\n", GST_STIME_ARGS(ts));
260 #define GST_STIME_FORMAT "c%" GST_TIME_FORMAT
262 * GST_STIME_ARGS: (skip):
263 * @t: a #GstClockTimeDiff or #gint64
265 * Formats @t for the #GST_STIME_FORMAT format string. Note: @t will be
266 * evaluated more than once.
270 #define GST_STIME_ARGS(t) \
271 ((t) == GST_CLOCK_STIME_NONE || (t) >= 0) ? '+' : '-', \
272 GST_CLOCK_STIME_IS_VALID (t) ? \
273 (guint) (((GstClockTime)(ABS(t))) / (GST_SECOND * 60 * 60)) : 99, \
274 GST_CLOCK_STIME_IS_VALID (t) ? \
275 (guint) ((((GstClockTime)(ABS(t))) / (GST_SECOND * 60)) % 60) : 99, \
276 GST_CLOCK_STIME_IS_VALID (t) ? \
277 (guint) ((((GstClockTime)(ABS(t))) / GST_SECOND) % 60) : 99, \
278 GST_CLOCK_STIME_IS_VALID (t) ? \
279 (guint) (((GstClockTime)(ABS(t))) % GST_SECOND) : 999999999
281 typedef struct _GstClockEntry GstClockEntry;
282 typedef struct _GstClock GstClock;
283 typedef struct _GstClockClass GstClockClass;
284 typedef struct _GstClockPrivate GstClockPrivate;
286 /* --- prototype for async callbacks --- */
289 * @clock: The clock that triggered the callback
290 * @time: The time it was triggered
291 * @id: The #GstClockID that expired
292 * @user_data: user data passed in the gst_clock_id_wait_async() function
294 * The function prototype of the callback.
296 * Returns: %TRUE or %FALSE (currently unused)
298 typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
299 GstClockID id, gpointer user_data);
302 * @GST_CLOCK_OK: The operation succeeded.
303 * @GST_CLOCK_EARLY: The operation was scheduled too late.
304 * @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
305 * @GST_CLOCK_BUSY: The ClockID is busy
306 * @GST_CLOCK_BADTIME: A bad time was provided to a function.
307 * @GST_CLOCK_ERROR: An error occurred
308 * @GST_CLOCK_UNSUPPORTED: Operation is not supported
309 * @GST_CLOCK_DONE: The ClockID is done waiting
311 * The return value of a clock operation.
317 GST_CLOCK_UNSCHEDULED = 2,
319 GST_CLOCK_BADTIME = 4,
321 GST_CLOCK_UNSUPPORTED = 6,
327 * @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
328 * @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
330 * The type of the clock entry
333 GST_CLOCK_ENTRY_SINGLE,
334 GST_CLOCK_ENTRY_PERIODIC
339 * @entry: the entry to cast
341 * Casts to a clock entry
343 #define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
345 #ifndef GST_DISABLE_DEPRECATED
347 * GST_CLOCK_ENTRY_CLOCK:
348 * @entry: the entry to query
350 * Gets the owner clock of the entry
352 * Deprecated: Use gst_clock_id_get_clock() instead.
354 #define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
357 * GST_CLOCK_ENTRY_TYPE:
358 * @entry: the entry to query
360 * Gets the type of the clock entry
362 #define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
364 * GST_CLOCK_ENTRY_TIME:
365 * @entry: the entry to query
367 * Gets the requested time of this entry
369 #define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
371 * GST_CLOCK_ENTRY_INTERVAL:
372 * @entry: the entry to query
374 * Gets the interval of this periodic entry
376 #define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
378 * GST_CLOCK_ENTRY_STATUS:
379 * @entry: the entry to query
381 * The status of the entry
383 #define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
387 * @refcount: reference counter (read-only)
389 * All pending timeouts or periodic notifies are converted into
391 * Note that GstClockEntry should be treated as an opaque structure. It must
392 * not be extended or allocated using a custom allocator.
394 struct _GstClockEntry {
397 #ifndef GST_REMOVE_DEPRECATED
398 #ifndef GST_DISABLE_DEPRECATED
404 GstClockEntryType type;
406 GstClockTime interval;
407 GstClockReturn status;
408 GstClockCallback func;
410 GDestroyNotify destroy_data;
411 gboolean unscheduled;
415 gpointer _gst_reserved[GST_PADDING];
418 #include <gst/gstobject.h>
422 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
423 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
424 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
425 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
426 * @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
427 * @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
428 * @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
430 * The capabilities of this clock
433 GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
434 GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
435 GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
436 GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
437 GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
438 GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
441 * GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC:
443 * clock needs to be synced before it can be used
447 GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC = (GST_OBJECT_FLAG_LAST << 6),
449 GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
454 * @clock: the clock to query
456 * Gets the #GstClockFlags clock flags.
458 #define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
462 * @object: the parent structure
464 * #GstClock base structure.
470 GstClockPrivate *priv;
472 gpointer _gst_reserved[GST_PADDING];
477 * @parent_class: the parent class structure
479 * GStreamer clock class. Override the vmethods to implement the clock
482 struct _GstClockClass {
483 GstObjectClass parent_class;
489 * GstClockClass::change_resolution:
490 * @clock: the #GstClock
491 * @old_resolution: the previous resolution
492 * @new_resolution: the new resolution
494 * Change the resolution of the clock. Not all values might
497 * Returns: the new resolution
499 GstClockTime (*change_resolution) (GstClock *clock,
500 GstClockTime old_resolution,
501 GstClockTime new_resolution);
504 * GstClockClass::get_resolution:
505 * @clock: the #GstClock
507 * Get the resolution of the clock.
509 * Returns: the current resolution
511 GstClockTime (*get_resolution) (GstClock *clock);
514 * GstClockClass::get_internal_time:
515 * @clock: the #GstClock
517 * Get the internal unadjusted time of the clock.
519 * Implement #GstClockClass::wait instead.
521 * Returns: the internal time
523 GstClockTime (*get_internal_time) (GstClock *clock);
525 /* waiting on an ID */
528 * GstClockClass::wait:
529 * @clock: the #GstClock
530 * @entry: the entry to wait on
531 * @jitter: (out) (allow-none): a pointer that will contain the jitter
533 * Perform a blocking wait on the given #GstClockEntry and return
536 * Returns: the result of the blocking wait. #GST_CLOCK_EARLY will be returned
537 * if the current clock time is past the time of @id, #GST_CLOCK_OK if
538 * @id was scheduled in time. #GST_CLOCK_UNSCHEDULED if @id was
539 * unscheduled with gst_clock_id_unschedule().
541 GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
542 GstClockTimeDiff *jitter);
545 * GstClockClass::wait_async:
546 * @clock: the #GstClock
547 * @entry: the entry to wait on
549 * Perform an asynchronous wait on the given #GstClockEntry.
551 * Returns: the result of the non blocking wait.
553 GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
556 * GstClockClass::unschedule:
557 * @clock: the #GstClock
558 * @entry: the entry to unschedule
560 * Unblock a blocking or async wait operation.
562 void (*unschedule) (GstClock *clock, GstClockEntry *entry);
565 gpointer _gst_reserved[GST_PADDING];
569 GType gst_clock_get_type (void);
572 GstClockTime gst_clock_set_resolution (GstClock *clock,
573 GstClockTime resolution);
575 GstClockTime gst_clock_get_resolution (GstClock *clock);
578 GstClockTime gst_clock_get_time (GstClock *clock);
581 void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
582 GstClockTime external,
583 GstClockTime rate_num,
584 GstClockTime rate_denom);
586 void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
587 GstClockTime *external,
588 GstClockTime *rate_num,
589 GstClockTime *rate_denom);
591 /* master/slave clocks */
594 gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
597 GstClock* gst_clock_get_master (GstClock *clock);
600 void gst_clock_set_timeout (GstClock *clock,
601 GstClockTime timeout);
603 GstClockTime gst_clock_get_timeout (GstClock *clock);
606 gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
607 GstClockTime master, gdouble *r_squared);
609 gboolean gst_clock_add_observation_unapplied (GstClock *clock, GstClockTime slave,
610 GstClockTime master, gdouble *r_squared,
611 GstClockTime *internal,
612 GstClockTime *external,
613 GstClockTime *rate_num,
614 GstClockTime *rate_denom);
616 /* getting and adjusting internal/external time */
619 GstClockTime gst_clock_get_internal_time (GstClock *clock);
622 GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
625 GstClockTime gst_clock_adjust_with_calibration (GstClock *clock,
626 GstClockTime internal_target,
627 GstClockTime cinternal,
628 GstClockTime cexternal,
630 GstClockTime cdenom);
632 GstClockTime gst_clock_unadjust_with_calibration (GstClock *clock,
633 GstClockTime external_target,
634 GstClockTime cinternal,
635 GstClockTime cexternal,
637 GstClockTime cdenom);
639 GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
641 /* waiting for, signalling and checking for synchronization */
644 gboolean gst_clock_wait_for_sync (GstClock * clock, GstClockTime timeout);
647 gboolean gst_clock_is_synced (GstClock * clock);
649 /* to be used by subclasses only */
652 void gst_clock_set_synced (GstClock * clock, gboolean synced);
654 /* creating IDs that can be used to get notifications */
657 GstClockID gst_clock_new_single_shot_id (GstClock *clock,
660 GstClockID gst_clock_new_periodic_id (GstClock *clock,
661 GstClockTime start_time,
662 GstClockTime interval);
664 /* reference counting */
667 GstClockID gst_clock_id_ref (GstClockID id);
670 void gst_clock_id_unref (GstClockID id);
672 /* operations on IDs */
675 gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
678 GstClock * gst_clock_id_get_clock (GstClockID id);
681 gboolean gst_clock_id_uses_clock (GstClockID id, GstClock * clock);
684 GstClockTime gst_clock_id_get_time (GstClockID id);
687 GstClockReturn gst_clock_id_wait (GstClockID id,
688 GstClockTimeDiff *jitter);
690 GstClockReturn gst_clock_id_wait_async (GstClockID id,
691 GstClockCallback func,
693 GDestroyNotify destroy_data);
695 void gst_clock_id_unschedule (GstClockID id);
698 gboolean gst_clock_single_shot_id_reinit (GstClock * clock,
702 gboolean gst_clock_periodic_id_reinit (GstClock * clock,
704 GstClockTime start_time,
705 GstClockTime interval);
707 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstClock, gst_object_unref)
708 G_DEFINE_AUTO_CLEANUP_FREE_FUNC(GstClockID, gst_clock_id_unref, 0)
712 #endif /* __GST_CLOCK_H__ */