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 * 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)
82 /* FIXME: still need to explicitly force types on the defines below */
86 * Constant that defines one GStreamer second.
91 #define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
95 * Constant that defines one GStreamer millisecond.
100 #define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
104 * Constant that defines one GStreamer microsecond.
109 #define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
113 * Constant that defines one GStreamer nanosecond
118 #define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
122 * GST_TIME_AS_SECONDS:
125 * Convert a #GstClockTime to seconds.
129 #define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
131 * GST_TIME_AS_MSECONDS:
134 * 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).
147 #define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
149 * GST_TIME_AS_NSECONDS:
152 * Convert a #GstClockTime to nanoseconds (1/1000000000 of a second).
156 #define GST_TIME_AS_NSECONDS(time) (time)
161 * @e: the second time
163 * Calculate a difference between two clock times as a #GstClockTimeDiff.
164 * The difference is calculated as @e - @s.
166 #define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
169 * GST_TIMEVAL_TO_TIME:
170 * @tv: the timeval to convert
172 * Convert a #GTimeVal to a #GstClockTime.
174 #define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
177 * GST_TIME_TO_TIMEVAL:
178 * @t: The #GstClockTime to convert
179 * @tv: The target timeval
181 * Convert a #GstClockTime to a #GTimeVal
183 * <note>on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
184 * which is about 68 years. Expect trouble if you want to schedule stuff
185 * in your pipeline for 2038.</note>
187 #define GST_TIME_TO_TIMEVAL(t,tv) \
189 g_assert ("Value of time " #t " is out of timeval's range" && \
190 ((t) / GST_SECOND) < G_MAXLONG); \
191 (tv).tv_sec = (glong) (((GstClockTime) (t)) / GST_SECOND); \
192 (tv).tv_usec = (glong) ((((GstClockTime) (t)) - \
193 ((GstClockTime) (tv).tv_sec) * GST_SECOND) \
198 * GST_TIMESPEC_TO_TIME:
199 * @ts: the timespec to convert
201 * Convert a struct timespec (see man pselect) to a #GstClockTime.
203 #define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
205 * GST_TIME_TO_TIMESPEC:
206 * @t: The #GstClockTime to convert
207 * @ts: The target timespec
209 * Convert a #GstClockTime to a struct timespec (see man pselect)
211 #define GST_TIME_TO_TIMESPEC(t,ts) \
213 g_assert ("Value of time " #t " is out of timespec's range" && \
214 ((t) / GST_SECOND) < G_MAXLONG); \
215 (ts).tv_sec = (glong) ((t) / GST_SECOND); \
216 (ts).tv_nsec = (glong) (((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND); \
219 /* timestamp debugging macros */
223 * A string that can be used in printf-like format strings to display a
224 * #GstClockTime value in h:m:s format. Use GST_TIME_ARGS() to construct
225 * the matching arguments.
229 * printf("%" GST_TIME_FORMAT "\n", GST_TIME_ARGS(ts));
232 #define GST_TIME_FORMAT "u:%02u:%02u.%09u"
235 * @t: a #GstClockTime
237 * Format @t for the #GST_TIME_FORMAT format string. Note: @t will be
238 * evaluated more than once.
240 #define GST_TIME_ARGS(t) \
241 GST_CLOCK_TIME_IS_VALID (t) ? \
242 (guint) (((GstClockTime)(t)) / (GST_SECOND * 60 * 60)) : 99, \
243 GST_CLOCK_TIME_IS_VALID (t) ? \
244 (guint) ((((GstClockTime)(t)) / (GST_SECOND * 60)) % 60) : 99, \
245 GST_CLOCK_TIME_IS_VALID (t) ? \
246 (guint) ((((GstClockTime)(t)) / GST_SECOND) % 60) : 99, \
247 GST_CLOCK_TIME_IS_VALID (t) ? \
248 (guint) (((GstClockTime)(t)) % GST_SECOND) : 999999999
250 typedef struct _GstClockEntry GstClockEntry;
251 typedef struct _GstClock GstClock;
252 typedef struct _GstClockClass GstClockClass;
253 typedef struct _GstClockPrivate GstClockPrivate;
255 /* --- prototype for async callbacks --- */
258 * @clock: The clock that triggered the callback
259 * @time: The time it was triggered
260 * @id: The #GstClockID that expired
261 * @user_data: user data passed in the gst_clock_id_wait_async() function
263 * The function prototype of the callback.
265 * Returns: %TRUE or %FALSE (currently unused)
267 typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
268 GstClockID id, gpointer user_data);
271 * @GST_CLOCK_OK: The operation succeeded.
272 * @GST_CLOCK_EARLY: The operation was scheduled too late.
273 * @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
274 * @GST_CLOCK_BUSY: The ClockID is busy
275 * @GST_CLOCK_BADTIME: A bad time was provided to a function.
276 * @GST_CLOCK_ERROR: An error occurred
277 * @GST_CLOCK_UNSUPPORTED: Operation is not supported
278 * @GST_CLOCK_DONE: The ClockID is done waiting (Since: 0.10.32)
280 * The return value of a clock operation.
286 GST_CLOCK_UNSCHEDULED = 2,
288 GST_CLOCK_BADTIME = 4,
290 GST_CLOCK_UNSUPPORTED = 6,
296 * @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
297 * @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
299 * The type of the clock entry
302 GST_CLOCK_ENTRY_SINGLE,
303 GST_CLOCK_ENTRY_PERIODIC
308 * @entry: the entry to cast
310 * Cast to a clock entry
312 #define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
314 * GST_CLOCK_ENTRY_CLOCK:
315 * @entry: the entry to query
317 * Get the owner clock of the entry
319 #define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
321 * GST_CLOCK_ENTRY_TYPE:
322 * @entry: the entry to query
324 * Get the type of the clock entry
326 #define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
328 * GST_CLOCK_ENTRY_TIME:
329 * @entry: the entry to query
331 * Get the requested time of this entry
333 #define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
335 * GST_CLOCK_ENTRY_INTERVAL:
336 * @entry: the entry to query
338 * Get the interval of this periodic entry
340 #define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
342 * GST_CLOCK_ENTRY_STATUS:
343 * @entry: the entry to query
345 * The status of the entry
347 #define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
351 * @refcount: reference counter (read-only)
353 * All pending timeouts or periodic notifies are converted into
355 * Note that GstClockEntry should be treated as an opaque structure. It must
356 * not be extended or allocated using a custom allocator.
358 struct _GstClockEntry {
362 GstClockEntryType type;
364 GstClockTime interval;
365 GstClockReturn status;
366 GstClockCallback func;
368 GDestroyNotify destroy_data;
369 gboolean unscheduled;
373 gpointer _gst_reserved[GST_PADDING];
376 #include <gst/gstobject.h>
380 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
381 * @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
382 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
383 * @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
384 * @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
385 * @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
386 * @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
388 * The capabilities of this clock
391 GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
392 GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
393 GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
394 GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
395 GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
396 GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
398 GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
403 * @clock: the clock to query
405 * Gets the #GstClockFlags clock flags.
407 #define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
412 * #GstClock base structure. The values of this structure are
413 * protected for subclasses, use the methods to use the #GstClock.
419 GstClockPrivate *priv;
421 gpointer _gst_reserved[GST_PADDING];
426 * @parent_class: the parent class structure
427 * @change_resolution: change the resolution of the clock. Not all values might
428 * be acceptable. The new resolution should be returned.
429 * @get_resolution: get the resolution of the clock.
430 * @get_internal_time: get the internal unadjusted time of the clock.
431 * implement @wait_jitter instead.
432 * @wait: perform a blocking wait on the given #GstClockEntry and return
434 * @wait_async: perform an asynchronous wait for the given #GstClockEntry.
435 * @unschedule: unblock a blocking or async wait operation.
437 * GStreamer clock class. Override the vmethods to implement the clock
440 struct _GstClockClass {
441 GstObjectClass parent_class;
445 GstClockTime (*change_resolution) (GstClock *clock,
446 GstClockTime old_resolution,
447 GstClockTime new_resolution);
448 GstClockTime (*get_resolution) (GstClock *clock);
450 GstClockTime (*get_internal_time) (GstClock *clock);
452 /* waiting on an ID */
453 GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
454 GstClockTimeDiff *jitter);
455 GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
456 void (*unschedule) (GstClock *clock, GstClockEntry *entry);
459 gpointer _gst_reserved[GST_PADDING];
462 GType gst_clock_get_type (void);
464 GstClockTime gst_clock_set_resolution (GstClock *clock,
465 GstClockTime resolution);
466 GstClockTime gst_clock_get_resolution (GstClock *clock);
468 GstClockTime gst_clock_get_time (GstClock *clock);
469 void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
470 GstClockTime external,
471 GstClockTime rate_num,
472 GstClockTime rate_denom);
473 void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
474 GstClockTime *external,
475 GstClockTime *rate_num,
476 GstClockTime *rate_denom);
478 /* master/slave clocks */
479 gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
480 GstClock* gst_clock_get_master (GstClock *clock);
482 void gst_clock_set_timeout (GstClock *clock,
483 GstClockTime timeout);
484 GstClockTime gst_clock_get_timeout (GstClock *clock);
486 gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
487 GstClockTime master, gdouble *r_squared);
490 /* getting and adjusting internal/external time */
491 GstClockTime gst_clock_get_internal_time (GstClock *clock);
492 GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
493 GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
496 /* creating IDs that can be used to get notifications */
497 GstClockID gst_clock_new_single_shot_id (GstClock *clock,
499 GstClockID gst_clock_new_periodic_id (GstClock *clock,
500 GstClockTime start_time,
501 GstClockTime interval);
503 /* reference counting */
504 GstClockID gst_clock_id_ref (GstClockID id);
505 void gst_clock_id_unref (GstClockID id);
507 /* operations on IDs */
508 gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
510 GstClockTime gst_clock_id_get_time (GstClockID id);
511 GstClockReturn gst_clock_id_wait (GstClockID id,
512 GstClockTimeDiff *jitter);
513 GstClockReturn gst_clock_id_wait_async (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__ */