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 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)
98 /* FIXME: still need to explicitly force types on the defines below */
100 * GST_SECOND: (value 1000000000) (type GstClockTime)
102 * Constant that defines one GStreamer second.
104 #define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
106 * GST_MSECOND: (value 1000000) (type GstClockTime)
108 * Constant that defines one GStreamer millisecond.
110 #define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
112 * GST_USECOND: (value 1000) (type GstClockTime)
114 * Constant that defines one GStreamer microsecond.
116 #define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
118 * GST_NSECOND: (value 1) (type GstClockTime)
120 * Constant that defines one GStreamer nanosecond
122 #define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
126 * GST_TIME_AS_SECONDS:
129 * Convert a #GstClockTime to seconds.
131 #define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
133 * GST_TIME_AS_MSECONDS:
136 * Convert a #GstClockTime to milliseconds (1/1000 of a second).
138 #define GST_TIME_AS_MSECONDS(time) ((time) / G_GINT64_CONSTANT (1000000))
140 * GST_TIME_AS_USECONDS:
143 * Convert a #GstClockTime to microseconds (1/1000000 of a second).
145 #define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
147 * GST_TIME_AS_NSECONDS:
150 * Convert a #GstClockTime to nanoseconds (1/1000000000 of a second).
152 #define GST_TIME_AS_NSECONDS(time) (time)
157 * @e: the second time
159 * Calculate a difference between two clock times as a #GstClockTimeDiff.
160 * The difference is calculated as @e - @s.
162 #define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
165 * GST_TIMEVAL_TO_TIME:
166 * @tv: the timeval to convert
168 * Convert a #GTimeVal to a #GstClockTime.
170 #define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
173 * GST_TIME_TO_TIMEVAL:
174 * @t: The #GstClockTime to convert
175 * @tv: The target timeval
177 * Convert a #GstClockTime to a #GTimeVal
179 * <note>on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
180 * which is about 68 years. Expect trouble if you want to schedule stuff
181 * in your pipeline for 2038.</note>
183 #define GST_TIME_TO_TIMEVAL(t,tv) \
185 g_assert ("Value of time " #t " is out of timeval's range" && \
186 ((t) / GST_SECOND) < G_MAXLONG); \
187 (tv).tv_sec = (glong) (((GstClockTime) (t)) / GST_SECOND); \
188 (tv).tv_usec = (glong) ((((GstClockTime) (t)) - \
189 ((GstClockTime) (tv).tv_sec) * GST_SECOND) \
194 * GST_TIMESPEC_TO_TIME:
195 * @ts: the timespec to convert
197 * Convert a struct timespec (see man pselect) to a #GstClockTime.
199 #define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
201 * GST_TIME_TO_TIMESPEC:
202 * @t: The #GstClockTime to convert
203 * @ts: The target timespec
205 * Convert a #GstClockTime to a struct timespec (see man pselect)
207 #define GST_TIME_TO_TIMESPEC(t,ts) \
209 g_assert ("Value of time " #t " is out of timespec's range" && \
210 ((t) / GST_SECOND) < G_MAXLONG); \
211 (ts).tv_sec = (glong) ((t) / GST_SECOND); \
212 (ts).tv_nsec = (glong) (((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND); \
215 /* timestamp debugging macros */
219 * A string that can be used in printf-like format strings to display a
220 * #GstClockTime value in h:m:s format. Use GST_TIME_ARGS() to construct
221 * the matching arguments.
224 * |[<!-- language="C" -->
225 * printf("%" GST_TIME_FORMAT "\n", GST_TIME_ARGS(ts));
228 #define GST_TIME_FORMAT "u:%02u:%02u.%09u"
231 * @t: a #GstClockTime
233 * Format @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
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.
254 * printf("%" GST_STIME_FORMAT "\n", GST_STIME_ARGS(ts));
259 #define GST_STIME_FORMAT "c%" GST_TIME_FORMAT
262 * @t: a #GstClockTimeDiff or #gint64
264 * Format @t for the #GST_STIME_FORMAT format string. Note: @t will be
265 * evaluated more than once.
269 #define GST_STIME_ARGS(t) \
270 ((t) == GST_CLOCK_STIME_NONE || (t) >= 0) ? '+' : '-', \
271 GST_CLOCK_STIME_IS_VALID (t) ? \
272 (guint) (((GstClockTime)(ABS(t))) / (GST_SECOND * 60 * 60)) : 99, \
273 GST_CLOCK_STIME_IS_VALID (t) ? \
274 (guint) ((((GstClockTime)(ABS(t))) / (GST_SECOND * 60)) % 60) : 99, \
275 GST_CLOCK_STIME_IS_VALID (t) ? \
276 (guint) ((((GstClockTime)(ABS(t))) / GST_SECOND) % 60) : 99, \
277 GST_CLOCK_STIME_IS_VALID (t) ? \
278 (guint) (((GstClockTime)(ABS(t))) % GST_SECOND) : 999999999
280 typedef struct _GstClockEntry GstClockEntry;
281 typedef struct _GstClock GstClock;
282 typedef struct _GstClockClass GstClockClass;
283 typedef struct _GstClockPrivate GstClockPrivate;
285 /* --- prototype for async callbacks --- */
288 * @clock: The clock that triggered the callback
289 * @time: The time it was triggered
290 * @id: The #GstClockID that expired
291 * @user_data: user data passed in the gst_clock_id_wait_async() function
293 * The function prototype of the callback.
295 * Returns: %TRUE or %FALSE (currently unused)
297 typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
298 GstClockID id, gpointer user_data);
301 * @GST_CLOCK_OK: The operation succeeded.
302 * @GST_CLOCK_EARLY: The operation was scheduled too late.
303 * @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
304 * @GST_CLOCK_BUSY: The ClockID is busy
305 * @GST_CLOCK_BADTIME: A bad time was provided to a function.
306 * @GST_CLOCK_ERROR: An error occurred
307 * @GST_CLOCK_UNSUPPORTED: Operation is not supported
308 * @GST_CLOCK_DONE: The ClockID is done waiting
310 * The return value of a clock operation.
316 GST_CLOCK_UNSCHEDULED = 2,
318 GST_CLOCK_BADTIME = 4,
320 GST_CLOCK_UNSUPPORTED = 6,
326 * @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
327 * @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
329 * The type of the clock entry
332 GST_CLOCK_ENTRY_SINGLE,
333 GST_CLOCK_ENTRY_PERIODIC
338 * @entry: the entry to cast
340 * Cast to a clock entry
342 #define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
344 * GST_CLOCK_ENTRY_CLOCK:
345 * @entry: the entry to query
347 * Get the owner clock of the entry
349 #define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
351 * GST_CLOCK_ENTRY_TYPE:
352 * @entry: the entry to query
354 * Get the type of the clock entry
356 #define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
358 * GST_CLOCK_ENTRY_TIME:
359 * @entry: the entry to query
361 * Get the requested time of this entry
363 #define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
365 * GST_CLOCK_ENTRY_INTERVAL:
366 * @entry: the entry to query
368 * Get the interval of this periodic entry
370 #define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
372 * GST_CLOCK_ENTRY_STATUS:
373 * @entry: the entry to query
375 * The status of the entry
377 #define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
381 * @refcount: reference counter (read-only)
383 * All pending timeouts or periodic notifies are converted into
385 * Note that GstClockEntry should be treated as an opaque structure. It must
386 * not be extended or allocated using a custom allocator.
388 struct _GstClockEntry {
392 GstClockEntryType type;
394 GstClockTime interval;
395 GstClockReturn status;
396 GstClockCallback func;
398 GDestroyNotify destroy_data;
399 gboolean unscheduled;
403 gpointer _gst_reserved[GST_PADDING];
406 #include <gst/gstobject.h>
410 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
411 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
412 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
413 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
414 * @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
415 * @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
416 * @GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC: clock needs to be synced before it can be used
418 * @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
420 * The capabilities of this clock
423 GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
424 GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
425 GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
426 GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
427 GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
428 GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
429 GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC = (GST_OBJECT_FLAG_LAST << 6),
431 GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
436 * @clock: the clock to query
438 * Gets the #GstClockFlags clock flags.
440 #define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
445 * #GstClock base structure. The values of this structure are
446 * protected for subclasses, use the methods to use the #GstClock.
452 GstClockPrivate *priv;
454 gpointer _gst_reserved[GST_PADDING];
459 * @parent_class: the parent class structure
460 * @change_resolution: change the resolution of the clock. Not all values might
461 * be acceptable. The new resolution should be returned.
462 * @get_resolution: get the resolution of the clock.
463 * @get_internal_time: get the internal unadjusted time of the clock.
464 * implement @wait_jitter instead.
465 * @wait: perform a blocking wait on the given #GstClockEntry and return
467 * @wait_async: perform an asynchronous wait for the given #GstClockEntry.
468 * @unschedule: unblock a blocking or async wait operation.
470 * GStreamer clock class. Override the vmethods to implement the clock
473 struct _GstClockClass {
474 GstObjectClass parent_class;
478 GstClockTime (*change_resolution) (GstClock *clock,
479 GstClockTime old_resolution,
480 GstClockTime new_resolution);
481 GstClockTime (*get_resolution) (GstClock *clock);
483 GstClockTime (*get_internal_time) (GstClock *clock);
485 /* waiting on an ID */
486 GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
487 GstClockTimeDiff *jitter);
488 GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
489 void (*unschedule) (GstClock *clock, GstClockEntry *entry);
492 gpointer _gst_reserved[GST_PADDING];
495 GType gst_clock_get_type (void);
497 GstClockTime gst_clock_set_resolution (GstClock *clock,
498 GstClockTime resolution);
499 GstClockTime gst_clock_get_resolution (GstClock *clock);
501 GstClockTime gst_clock_get_time (GstClock *clock);
502 void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
503 GstClockTime external,
504 GstClockTime rate_num,
505 GstClockTime rate_denom);
506 void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
507 GstClockTime *external,
508 GstClockTime *rate_num,
509 GstClockTime *rate_denom);
511 /* master/slave clocks */
512 gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
513 GstClock* gst_clock_get_master (GstClock *clock);
515 void gst_clock_set_timeout (GstClock *clock,
516 GstClockTime timeout);
517 GstClockTime gst_clock_get_timeout (GstClock *clock);
519 gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
520 GstClockTime master, gdouble *r_squared);
522 gboolean gst_clock_add_observation_unapplied (GstClock *clock, GstClockTime slave,
523 GstClockTime master, gdouble *r_squared,
524 GstClockTime *internal,
525 GstClockTime *external,
526 GstClockTime *rate_num,
527 GstClockTime *rate_denom);
529 /* getting and adjusting internal/external time */
530 GstClockTime gst_clock_get_internal_time (GstClock *clock);
531 GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
532 GstClockTime gst_clock_adjust_with_calibration (GstClock *clock,
533 GstClockTime internal_target,
534 GstClockTime cinternal,
535 GstClockTime cexternal,
537 GstClockTime cdenom);
538 GstClockTime gst_clock_unadjust_with_calibration (GstClock *clock,
539 GstClockTime external_target,
540 GstClockTime cinternal,
541 GstClockTime cexternal,
543 GstClockTime cdenom);
544 GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
546 /* waiting for, signalling and checking for synchronization */
547 gboolean gst_clock_wait_for_sync (GstClock * clock, GstClockTime timeout);
548 gboolean gst_clock_is_synced (GstClock * clock);
550 /* to be used by subclasses only */
551 void gst_clock_set_synced (GstClock * clock, gboolean synced);
553 /* creating IDs that can be used to get notifications */
554 GstClockID gst_clock_new_single_shot_id (GstClock *clock,
556 GstClockID gst_clock_new_periodic_id (GstClock *clock,
557 GstClockTime start_time,
558 GstClockTime interval);
560 /* reference counting */
561 GstClockID gst_clock_id_ref (GstClockID id);
562 void gst_clock_id_unref (GstClockID id);
564 /* operations on IDs */
565 gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
567 GstClockTime gst_clock_id_get_time (GstClockID id);
568 GstClockReturn gst_clock_id_wait (GstClockID id,
569 GstClockTimeDiff *jitter);
570 GstClockReturn gst_clock_id_wait_async (GstClockID id,
571 GstClockCallback func,
573 GDestroyNotify destroy_data);
574 void gst_clock_id_unschedule (GstClockID id);
576 gboolean gst_clock_single_shot_id_reinit (GstClock * clock,
579 gboolean gst_clock_periodic_id_reinit (GstClock * clock,
581 GstClockTime start_time,
582 GstClockTime interval);
584 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
585 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstClock, gst_object_unref)
590 #endif /* __GST_CLOCK_H__ */