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., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, 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 #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)
79 /* FIXME: still need to explicitly force types on the defines below */
83 * Constant that defines one GStreamer second.
88 #define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
92 * Constant that defines one GStreamer millisecond.
97 #define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
101 * Constant that defines one GStreamer microsecond.
106 #define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
110 * Constant that defines one GStreamer nanosecond
115 #define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
119 * GST_TIME_AS_SECONDS:
122 * Convert a #GstClockTime to seconds.
126 #define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
128 * GST_TIME_AS_MSECONDS:
131 * 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).
144 #define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
146 * GST_TIME_AS_NSECONDS:
149 * Convert a #GstClockTime to nanoseconds (1/1000000000 of a second).
153 #define GST_TIME_AS_NSECONDS(time) (time)
158 * @e: the second time
160 * Calculate a difference between two clock times as a #GstClockTimeDiff.
161 * The difference is calculated as @e - @s.
163 #define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
166 * GST_TIMEVAL_TO_TIME:
167 * @tv: the timeval to convert
169 * Convert a #GTimeVal to a #GstClockTime.
171 #define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
174 * GST_TIME_TO_TIMEVAL:
175 * @t: The #GstClockTime to convert
176 * @tv: The target timeval
178 * Convert a #GstClockTime to a #GTimeVal
180 * <note>on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
181 * which is about 68 years. Expect trouble if you want to schedule stuff
182 * in your pipeline for 2038.</note>
184 #define GST_TIME_TO_TIMEVAL(t,tv) \
186 g_assert ("Value of time " #t " is out of timeval's range" && \
187 ((t) / GST_SECOND) < G_MAXLONG); \
188 (tv).tv_sec = (glong) (((GstClockTime) (t)) / GST_SECOND); \
189 (tv).tv_usec = (glong) ((((GstClockTime) (t)) - \
190 ((GstClockTime) (tv).tv_sec) * GST_SECOND) \
195 * GST_TIMESPEC_TO_TIME:
196 * @ts: the timespec to convert
198 * Convert a struct timespec (see man pselect) to a #GstClockTime.
200 #define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
202 * GST_TIME_TO_TIMESPEC:
203 * @t: The #GstClockTime to convert
204 * @ts: The target timespec
206 * Convert a #GstClockTime to a struct timespec (see man pselect)
208 #define GST_TIME_TO_TIMESPEC(t,ts) \
210 g_assert ("Value of time " #t " is out of timespec's range" && \
211 ((t) / GST_SECOND) < G_MAXLONG); \
212 (ts).tv_sec = (glong) ((t) / GST_SECOND); \
213 (ts).tv_nsec = (glong) (((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND); \
216 /* timestamp debugging macros */
220 * A string that can be used in printf-like format strings to display a
221 * #GstClockTime value in h:m:s format. Use GST_TIME_ARGS() to construct
222 * the matching arguments.
226 * printf("%" GST_TIME_FORMAT "\n", GST_TIME_ARGS(ts));
229 #define GST_TIME_FORMAT "u:%02u:%02u.%09u"
232 * @t: a #GstClockTime
234 * Format @t for the #GST_TIME_FORMAT format string. Note: @t will be
235 * evaluated more than once.
237 #define GST_TIME_ARGS(t) \
238 GST_CLOCK_TIME_IS_VALID (t) ? \
239 (guint) (((GstClockTime)(t)) / (GST_SECOND * 60 * 60)) : 99, \
240 GST_CLOCK_TIME_IS_VALID (t) ? \
241 (guint) ((((GstClockTime)(t)) / (GST_SECOND * 60)) % 60) : 99, \
242 GST_CLOCK_TIME_IS_VALID (t) ? \
243 (guint) ((((GstClockTime)(t)) / GST_SECOND) % 60) : 99, \
244 GST_CLOCK_TIME_IS_VALID (t) ? \
245 (guint) (((GstClockTime)(t)) % GST_SECOND) : 999999999
247 typedef struct _GstClockEntry GstClockEntry;
248 typedef struct _GstClock GstClock;
249 typedef struct _GstClockClass GstClockClass;
250 typedef struct _GstClockPrivate GstClockPrivate;
252 /* --- prototype for async callbacks --- */
255 * @clock: The clock that triggered the callback
256 * @time: The time it was triggered
257 * @id: The #GstClockID that expired
258 * @user_data: user data passed in the gst_clock_id_wait_async() function
260 * The function prototype of the callback.
262 * Returns: %TRUE or %FALSE (currently unused)
264 typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
265 GstClockID id, gpointer user_data);
268 * @GST_CLOCK_OK: The operation succeeded.
269 * @GST_CLOCK_EARLY: The operation was scheduled too late.
270 * @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
271 * @GST_CLOCK_BUSY: The ClockID is busy
272 * @GST_CLOCK_BADTIME: A bad time was provided to a function.
273 * @GST_CLOCK_ERROR: An error occurred
274 * @GST_CLOCK_UNSUPPORTED: Operation is not supported
275 * @GST_CLOCK_DONE: The ClockID is done waiting (Since: 0.10.32)
277 * The return value of a clock operation.
283 GST_CLOCK_UNSCHEDULED = 2,
285 GST_CLOCK_BADTIME = 4,
287 GST_CLOCK_UNSUPPORTED = 6,
293 * @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
294 * @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
296 * The type of the clock entry
299 GST_CLOCK_ENTRY_SINGLE,
300 GST_CLOCK_ENTRY_PERIODIC
305 * @entry: the entry to cast
307 * Cast to a clock entry
309 #define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
311 * GST_CLOCK_ENTRY_CLOCK:
312 * @entry: the entry to query
314 * Get the owner clock of the entry
316 #define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
318 * GST_CLOCK_ENTRY_TYPE:
319 * @entry: the entry to query
321 * Get the type of the clock entry
323 #define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
325 * GST_CLOCK_ENTRY_TIME:
326 * @entry: the entry to query
328 * Get the requested time of this entry
330 #define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
332 * GST_CLOCK_ENTRY_INTERVAL:
333 * @entry: the entry to query
335 * Get the interval of this periodic entry
337 #define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
339 * GST_CLOCK_ENTRY_STATUS:
340 * @entry: the entry to query
342 * The status of the entry
344 #define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
348 * @refcount: reference counter (read-only)
350 * All pending timeouts or periodic notifies are converted into
352 * Note that GstClockEntry should be treated as an opaque structure. It must
353 * not be extended or allocated using a custom allocator.
355 struct _GstClockEntry {
359 GstClockEntryType type;
361 GstClockTime interval;
362 GstClockReturn status;
363 GstClockCallback func;
365 GDestroyNotify destroy_data;
366 gboolean unscheduled;
370 gpointer _gst_reserved[GST_PADDING];
373 #include <gst/gstobject.h>
377 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
378 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
379 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
380 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
381 * @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
382 * @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
383 * @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
385 * The capabilities of this clock
388 GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
389 GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
390 GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
391 GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
392 GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
393 GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
395 GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
400 * @clock: the clock to query
402 * Gets the #GstClockFlags clock flags.
404 #define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
409 * #GstClock base structure. The values of this structure are
410 * protected for subclasses, use the methods to use the #GstClock.
416 GstClockPrivate *priv;
418 gpointer _gst_reserved[GST_PADDING];
423 * @parent_class: the parent class structure
424 * @change_resolution: change the resolution of the clock. Not all values might
425 * be acceptable. The new resolution should be returned.
426 * @get_resolution: get the resolution of the clock.
427 * @get_internal_time: get the internal unadjusted time of the clock.
428 * implement @wait_jitter instead.
429 * @wait: perform a blocking wait on the given #GstClockEntry and return
431 * @wait_async: perform an asynchronous wait for the given #GstClockEntry.
432 * @unschedule: unblock a blocking or async wait operation.
434 * GStreamer clock class. Override the vmethods to implement the clock
437 struct _GstClockClass {
438 GstObjectClass parent_class;
442 GstClockTime (*change_resolution) (GstClock *clock,
443 GstClockTime old_resolution,
444 GstClockTime new_resolution);
445 GstClockTime (*get_resolution) (GstClock *clock);
447 GstClockTime (*get_internal_time) (GstClock *clock);
449 /* waiting on an ID */
450 GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
451 GstClockTimeDiff *jitter);
452 GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
453 void (*unschedule) (GstClock *clock, GstClockEntry *entry);
456 gpointer _gst_reserved[GST_PADDING];
459 GType gst_clock_get_type (void);
461 GstClockTime gst_clock_set_resolution (GstClock *clock,
462 GstClockTime resolution);
463 GstClockTime gst_clock_get_resolution (GstClock *clock);
465 GstClockTime gst_clock_get_time (GstClock *clock);
466 void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
467 GstClockTime external,
468 GstClockTime rate_num,
469 GstClockTime rate_denom);
470 void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
471 GstClockTime *external,
472 GstClockTime *rate_num,
473 GstClockTime *rate_denom);
475 /* master/slave clocks */
476 gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
477 GstClock* gst_clock_get_master (GstClock *clock);
479 void gst_clock_set_timeout (GstClock *clock,
480 GstClockTime timeout);
481 GstClockTime gst_clock_get_timeout (GstClock *clock);
483 gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
484 GstClockTime master, gdouble *r_squared);
487 /* getting and adjusting internal/external time */
488 GstClockTime gst_clock_get_internal_time (GstClock *clock);
489 GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
490 GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
493 /* creating IDs that can be used to get notifications */
494 GstClockID gst_clock_new_single_shot_id (GstClock *clock,
496 GstClockID gst_clock_new_periodic_id (GstClock *clock,
497 GstClockTime start_time,
498 GstClockTime interval);
500 /* reference counting */
501 GstClockID gst_clock_id_ref (GstClockID id);
502 void gst_clock_id_unref (GstClockID id);
504 /* operations on IDs */
505 gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
507 GstClockTime gst_clock_id_get_time (GstClockID id);
508 GstClockReturn gst_clock_id_wait (GstClockID id,
509 GstClockTimeDiff *jitter);
510 GstClockReturn gst_clock_id_wait_async (GstClockID id,
511 GstClockCallback func,
513 GstClockReturn gst_clock_id_wait_async_full (GstClockID id,
514 GstClockCallback func,
516 GDestroyNotify destroy_data);
517 void gst_clock_id_unschedule (GstClockID id);
519 gboolean gst_clock_single_shot_id_reinit (GstClock * clock,
522 gboolean gst_clock_periodic_id_reinit (GstClock * clock,
524 GstClockTime start_time,
525 GstClockTime interval);
529 #endif /* __GST_CLOCK_H__ */