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:
68 * Constant to define an undefined clock time.
70 * Value: 18446744073709551615
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:
85 * Constant to define an undefined clock time.
87 * Value: -9223372036854775808
90 #define GST_CLOCK_STIME_NONE G_MININT64
92 * GST_CLOCK_STIME_IS_VALID:
93 * @time: signed clock time to validate
95 * Tests if a given #GstClockTimeDiff of #gint64 represents a valid defined time.
99 #define GST_CLOCK_STIME_IS_VALID(time) (((GstClockTimeDiff)(time)) != GST_CLOCK_STIME_NONE)
101 /* FIXME: still need to explicitly force types on the defines below */
105 * Constant that defines one GStreamer second.
110 #define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
114 * Constant that defines one GStreamer millisecond.
119 #define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
123 * Constant that defines one GStreamer microsecond.
128 #define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
132 * Constant that defines one GStreamer nanosecond
137 #define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
141 * GST_TIME_AS_SECONDS:
144 * Convert a #GstClockTime to seconds.
146 #define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
148 * GST_TIME_AS_MSECONDS:
151 * Convert a #GstClockTime to milliseconds (1/1000 of a second).
153 #define GST_TIME_AS_MSECONDS(time) ((time) / G_GINT64_CONSTANT (1000000))
155 * GST_TIME_AS_USECONDS:
158 * Convert a #GstClockTime to microseconds (1/1000000 of a second).
160 #define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
162 * GST_TIME_AS_NSECONDS:
165 * Convert a #GstClockTime to nanoseconds (1/1000000000 of a second).
167 #define GST_TIME_AS_NSECONDS(time) (time)
172 * @e: the second time
174 * Calculate a difference between two clock times as a #GstClockTimeDiff.
175 * The difference is calculated as @e - @s.
177 #define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
180 * GST_TIMEVAL_TO_TIME:
181 * @tv: the timeval to convert
183 * Convert a #GTimeVal to a #GstClockTime.
185 #define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
188 * GST_TIME_TO_TIMEVAL:
189 * @t: The #GstClockTime to convert
190 * @tv: The target timeval
192 * Convert a #GstClockTime to a #GTimeVal
194 * <note>on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
195 * which is about 68 years. Expect trouble if you want to schedule stuff
196 * in your pipeline for 2038.</note>
198 #define GST_TIME_TO_TIMEVAL(t,tv) \
200 g_assert ("Value of time " #t " is out of timeval's range" && \
201 ((t) / GST_SECOND) < G_MAXLONG); \
202 (tv).tv_sec = (glong) (((GstClockTime) (t)) / GST_SECOND); \
203 (tv).tv_usec = (glong) ((((GstClockTime) (t)) - \
204 ((GstClockTime) (tv).tv_sec) * GST_SECOND) \
209 * GST_TIMESPEC_TO_TIME:
210 * @ts: the timespec to convert
212 * Convert a struct timespec (see man pselect) to a #GstClockTime.
214 #define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
216 * GST_TIME_TO_TIMESPEC:
217 * @t: The #GstClockTime to convert
218 * @ts: The target timespec
220 * Convert a #GstClockTime to a struct timespec (see man pselect)
222 #define GST_TIME_TO_TIMESPEC(t,ts) \
224 g_assert ("Value of time " #t " is out of timespec's range" && \
225 ((t) / GST_SECOND) < G_MAXLONG); \
226 (ts).tv_sec = (glong) ((t) / GST_SECOND); \
227 (ts).tv_nsec = (glong) (((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND); \
230 /* timestamp debugging macros */
234 * A string that can be used in printf-like format strings to display a
235 * #GstClockTime value in h:m:s format. Use GST_TIME_ARGS() to construct
236 * the matching arguments.
240 * printf("%" GST_TIME_FORMAT "\n", GST_TIME_ARGS(ts));
243 #define GST_TIME_FORMAT "u:%02u:%02u.%09u"
246 * @t: a #GstClockTime
248 * Format @t for the #GST_TIME_FORMAT format string. Note: @t will be
249 * evaluated more than once.
251 #define GST_TIME_ARGS(t) \
252 GST_CLOCK_TIME_IS_VALID (t) ? \
253 (guint) (((GstClockTime)(t)) / (GST_SECOND * 60 * 60)) : 99, \
254 GST_CLOCK_TIME_IS_VALID (t) ? \
255 (guint) ((((GstClockTime)(t)) / (GST_SECOND * 60)) % 60) : 99, \
256 GST_CLOCK_TIME_IS_VALID (t) ? \
257 (guint) ((((GstClockTime)(t)) / GST_SECOND) % 60) : 99, \
258 GST_CLOCK_TIME_IS_VALID (t) ? \
259 (guint) (((GstClockTime)(t)) % GST_SECOND) : 999999999
263 * A string that can be used in printf-like format strings to display a signed
264 * #GstClockTimeDiff or #gint64 value in h:m:s format. Use GST_TIME_ARGS() to
265 * construct the matching arguments.
269 * printf("%" GST_STIME_FORMAT "\n", GST_STIME_ARGS(ts));
274 #define GST_STIME_FORMAT "d:%02u:%02u.%09u"
277 * @t: a #GstClockTimeDiff or #gint64
279 * Format @t for the #GST_STIME_FORMAT format string. Note: @t will be
280 * evaluated more than once.
284 #define GST_STIME_ARGS(t) \
285 GST_CLOCK_STIME_IS_VALID (t) ? \
286 (gint) ((GstClockTimeDiff)(t) / (GST_SECOND * 60 * 60)) : -99, \
287 GST_CLOCK_STIME_IS_VALID (t) ? \
288 (guint) ((((GstClockTime)ABS(t)) / (GST_SECOND * 60)) % 60) : 99, \
289 GST_CLOCK_STIME_IS_VALID (t) ? \
290 (guint) ((((GstClockTime)ABS(t)) / GST_SECOND) % 60) : 99, \
291 GST_CLOCK_STIME_IS_VALID (t) ? \
292 (guint) (((GstClockTime)ABS(t)) % GST_SECOND) : 999999999
294 typedef struct _GstClockEntry GstClockEntry;
295 typedef struct _GstClock GstClock;
296 typedef struct _GstClockClass GstClockClass;
297 typedef struct _GstClockPrivate GstClockPrivate;
299 /* --- prototype for async callbacks --- */
302 * @clock: The clock that triggered the callback
303 * @time: The time it was triggered
304 * @id: The #GstClockID that expired
305 * @user_data: user data passed in the gst_clock_id_wait_async() function
307 * The function prototype of the callback.
309 * Returns: %TRUE or %FALSE (currently unused)
311 typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
312 GstClockID id, gpointer user_data);
315 * @GST_CLOCK_OK: The operation succeeded.
316 * @GST_CLOCK_EARLY: The operation was scheduled too late.
317 * @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
318 * @GST_CLOCK_BUSY: The ClockID is busy
319 * @GST_CLOCK_BADTIME: A bad time was provided to a function.
320 * @GST_CLOCK_ERROR: An error occurred
321 * @GST_CLOCK_UNSUPPORTED: Operation is not supported
322 * @GST_CLOCK_DONE: The ClockID is done waiting
324 * The return value of a clock operation.
330 GST_CLOCK_UNSCHEDULED = 2,
332 GST_CLOCK_BADTIME = 4,
334 GST_CLOCK_UNSUPPORTED = 6,
340 * @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
341 * @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
343 * The type of the clock entry
346 GST_CLOCK_ENTRY_SINGLE,
347 GST_CLOCK_ENTRY_PERIODIC
352 * @entry: the entry to cast
354 * Cast to a clock entry
356 #define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
358 * GST_CLOCK_ENTRY_CLOCK:
359 * @entry: the entry to query
361 * Get the owner clock of the entry
363 #define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
365 * GST_CLOCK_ENTRY_TYPE:
366 * @entry: the entry to query
368 * Get the type of the clock entry
370 #define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
372 * GST_CLOCK_ENTRY_TIME:
373 * @entry: the entry to query
375 * Get the requested time of this entry
377 #define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
379 * GST_CLOCK_ENTRY_INTERVAL:
380 * @entry: the entry to query
382 * Get the interval of this periodic entry
384 #define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
386 * GST_CLOCK_ENTRY_STATUS:
387 * @entry: the entry to query
389 * The status of the entry
391 #define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
395 * @refcount: reference counter (read-only)
397 * All pending timeouts or periodic notifies are converted into
399 * Note that GstClockEntry should be treated as an opaque structure. It must
400 * not be extended or allocated using a custom allocator.
402 struct _GstClockEntry {
406 GstClockEntryType type;
408 GstClockTime interval;
409 GstClockReturn status;
410 GstClockCallback func;
412 GDestroyNotify destroy_data;
413 gboolean unscheduled;
417 gpointer _gst_reserved[GST_PADDING];
420 #include <gst/gstobject.h>
424 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
425 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
426 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
427 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
428 * @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
429 * @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
430 * @GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC: clock needs to be synced before it can be used
432 * @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
434 * The capabilities of this clock
437 GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
438 GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
439 GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
440 GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
441 GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
442 GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
443 GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC = (GST_OBJECT_FLAG_LAST << 6),
445 GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
450 * @clock: the clock to query
452 * Gets the #GstClockFlags clock flags.
454 #define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
459 * #GstClock base structure. The values of this structure are
460 * protected for subclasses, use the methods to use the #GstClock.
466 GstClockPrivate *priv;
468 gpointer _gst_reserved[GST_PADDING];
473 * @parent_class: the parent class structure
474 * @change_resolution: change the resolution of the clock. Not all values might
475 * be acceptable. The new resolution should be returned.
476 * @get_resolution: get the resolution of the clock.
477 * @get_internal_time: get the internal unadjusted time of the clock.
478 * implement @wait_jitter instead.
479 * @wait: perform a blocking wait on the given #GstClockEntry and return
481 * @wait_async: perform an asynchronous wait for the given #GstClockEntry.
482 * @unschedule: unblock a blocking or async wait operation.
484 * GStreamer clock class. Override the vmethods to implement the clock
487 struct _GstClockClass {
488 GstObjectClass parent_class;
492 GstClockTime (*change_resolution) (GstClock *clock,
493 GstClockTime old_resolution,
494 GstClockTime new_resolution);
495 GstClockTime (*get_resolution) (GstClock *clock);
497 GstClockTime (*get_internal_time) (GstClock *clock);
499 /* waiting on an ID */
500 GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
501 GstClockTimeDiff *jitter);
502 GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
503 void (*unschedule) (GstClock *clock, GstClockEntry *entry);
506 gpointer _gst_reserved[GST_PADDING];
509 GType gst_clock_get_type (void);
511 GstClockTime gst_clock_set_resolution (GstClock *clock,
512 GstClockTime resolution);
513 GstClockTime gst_clock_get_resolution (GstClock *clock);
515 GstClockTime gst_clock_get_time (GstClock *clock);
516 void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
517 GstClockTime external,
518 GstClockTime rate_num,
519 GstClockTime rate_denom);
520 void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
521 GstClockTime *external,
522 GstClockTime *rate_num,
523 GstClockTime *rate_denom);
525 /* master/slave clocks */
526 gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
527 GstClock* gst_clock_get_master (GstClock *clock);
529 void gst_clock_set_timeout (GstClock *clock,
530 GstClockTime timeout);
531 GstClockTime gst_clock_get_timeout (GstClock *clock);
533 gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
534 GstClockTime master, gdouble *r_squared);
536 gboolean gst_clock_add_observation_unapplied (GstClock *clock, GstClockTime slave,
537 GstClockTime master, gdouble *r_squared,
538 GstClockTime *internal,
539 GstClockTime *external,
540 GstClockTime *rate_num,
541 GstClockTime *rate_denom);
543 /* getting and adjusting internal/external time */
544 GstClockTime gst_clock_get_internal_time (GstClock *clock);
545 GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
546 GstClockTime gst_clock_adjust_with_calibration (GstClock *clock,
547 GstClockTime internal_target,
548 GstClockTime cinternal,
549 GstClockTime cexternal,
551 GstClockTime cdenom);
552 GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
554 /* waiting for, signalling and checking for synchronization */
555 gboolean gst_clock_wait_for_sync (GstClock * clock, GstClockTime timeout);
556 gboolean gst_clock_is_synced (GstClock * clock);
558 /* to be used by subclasses only */
559 void gst_clock_set_synced (GstClock * clock, gboolean synced);
561 /* creating IDs that can be used to get notifications */
562 GstClockID gst_clock_new_single_shot_id (GstClock *clock,
564 GstClockID gst_clock_new_periodic_id (GstClock *clock,
565 GstClockTime start_time,
566 GstClockTime interval);
568 /* reference counting */
569 GstClockID gst_clock_id_ref (GstClockID id);
570 void gst_clock_id_unref (GstClockID id);
572 /* operations on IDs */
573 gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
575 GstClockTime gst_clock_id_get_time (GstClockID id);
576 GstClockReturn gst_clock_id_wait (GstClockID id,
577 GstClockTimeDiff *jitter);
578 GstClockReturn gst_clock_id_wait_async (GstClockID id,
579 GstClockCallback func,
581 GDestroyNotify destroy_data);
582 void gst_clock_id_unschedule (GstClockID id);
584 gboolean gst_clock_single_shot_id_reinit (GstClock * clock,
587 gboolean gst_clock_periodic_id_reinit (GstClock * clock,
589 GstClockTime start_time,
590 GstClockTime interval);
594 #endif /* __GST_CLOCK_H__ */