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b85b7ff0cf
Original commit message from CVS: Patch by: Peter Kjellerstedt <pkj axis com> * gst/gstclock.h: Cast the results from the timeval/spec_to_time macros to what the docs say it casts to, a GstClockTime. fixes #508175.
545 lines
16 KiB
C
545 lines
16 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstclock.h: Header for clock subsystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_CLOCK_H__
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#define __GST_CLOCK_H__
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#include <gst/gstobject.h>
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G_BEGIN_DECLS
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/* --- standard type macros --- */
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#define GST_TYPE_CLOCK (gst_clock_get_type ())
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#define GST_CLOCK(clock) (G_TYPE_CHECK_INSTANCE_CAST ((clock), GST_TYPE_CLOCK, GstClock))
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#define GST_IS_CLOCK(clock) (G_TYPE_CHECK_INSTANCE_TYPE ((clock), GST_TYPE_CLOCK))
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#define GST_CLOCK_CLASS(cclass) (G_TYPE_CHECK_CLASS_CAST ((cclass), GST_TYPE_CLOCK, GstClockClass))
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#define GST_IS_CLOCK_CLASS(cclass) (G_TYPE_CHECK_CLASS_TYPE ((cclass), GST_TYPE_CLOCK))
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#define GST_CLOCK_GET_CLASS(clock) (G_TYPE_INSTANCE_GET_CLASS ((clock), GST_TYPE_CLOCK, GstClockClass))
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#define GST_CLOCK_CAST(clock) ((GstClock*)(clock))
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#define GST_CLOCK_SLAVE_LOCK(clock) g_mutex_lock (GST_CLOCK_CAST (clock)->slave_lock)
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#define GST_CLOCK_SLAVE_UNLOCK(clock) g_mutex_unlock (GST_CLOCK_CAST (clock)->slave_lock)
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/**
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* GstClockTime:
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*
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* A datatype to hold a time, measured in nanoseconds.
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*/
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typedef guint64 GstClockTime;
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/**
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* GST_TYPE_CLOCK_TIME:
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*
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* The GType of a GstClockTime.
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*/
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#define GST_TYPE_CLOCK_TIME G_TYPE_UINT64
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/**
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* GstClockTimeDiff:
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*
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* A datatype to hold a timedifference, measured in nanoseconds.
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*/
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typedef gint64 GstClockTimeDiff;
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/**
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* GstClockID:
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*
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* A datatype to hold the handle to an outstanding sync or async clock callback.
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*/
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typedef gpointer GstClockID;
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/**
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* GST_CLOCK_TIME_NONE:
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*
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* Constant to define an undefined clock time.
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*/
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#define GST_CLOCK_TIME_NONE ((GstClockTime) -1)
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/**
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* GST_CLOCK_TIME_IS_VALID:
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* @time: clock time to validate
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*
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* Tests if a given #GstClockTime represents a valid defined time.
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*/
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#define GST_CLOCK_TIME_IS_VALID(time) (((GstClockTime)(time)) != GST_CLOCK_TIME_NONE)
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/**
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* GST_SECOND:
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*
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* Constant that defines one GStreamer second.
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*/
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#define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
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/**
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* GST_MSECOND:
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*
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* Constant that defines one GStreamer millisecond.
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*/
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#define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
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/**
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* GST_USECOND:
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*
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* Constant that defines one GStreamer microsecond.
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*/
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#define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
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/**
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* GST_NSECOND:
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*
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* Constant that defines one GStreamer nanosecond
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*/
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#define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
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/**
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* GST_TIME_AS_SECONDS:
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* @time: the time
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*
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* Convert a #GstClockTime to seconds.
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*
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* Since: 0.10.16
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*/
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#define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
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/**
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* GST_TIME_AS_MSECONDS:
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*
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* Convert a #GstClockTime to milliseconds (1/1000 of a second).
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*
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* Since: 0.10.16
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*/
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#define GST_TIME_AS_MSECONDS(time) ((time) / G_GINT64_CONSTANT (1000000))
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/**
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* GST_TIME_TO_USECONDS:
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*
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* Convert a #GstClockTime to microseconds (1/1000000 of a second).
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*
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* Since: 0.10.16
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*/
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#define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
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/**
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* GST_TIME_TO_NSECONDS:
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*
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* Convert a #GstClockTime to nanoseconds (1/1000000000 of a second).
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*
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* Since: 0.10.16
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*/
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#define GST_TIME_AS_NSECONDS(time) (time)
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/**
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* GST_CLOCK_DIFF:
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* @s: the first time
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* @e: the second time
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*
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* Calculate a difference between two clock times as a #GstClockTimeDiff.
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* The difference is calculated as @e - @s.
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*/
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#define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
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/**
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* GST_TIMEVAL_TO_TIME:
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* @tv: the timeval to convert
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*
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* Convert a GTimeVal to a #GstClockTime.
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*/
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#define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
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/**
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* GST_TIME_TO_TIMEVAL:
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* @t: The GstClockTime to convert
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* @tv: The target timeval
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*
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* Note: on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
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* which is about 68 years. Expect trouble if you want to schedule stuff
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* in your pipeline for 2038.
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*
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* Convert a GstClockTime to a GTimeVal
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*/
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#define GST_TIME_TO_TIMEVAL(t,tv) \
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G_STMT_START { \
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(tv).tv_sec = ((GstClockTime) (t)) / GST_SECOND; \
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(tv).tv_usec = (((GstClockTime) (t)) - \
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((GstClockTime) (tv).tv_sec) * GST_SECOND) \
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/ GST_USECOND; \
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} G_STMT_END
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/**
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* GST_TIMESPEC_TO_TIME:
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* @ts: the timespec to convert
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*
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* Convert a struct timespec (see man pselect) to a #GstClockTime.
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*/
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#define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
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/**
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* GST_TIME_TO_TIMESPEC:
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* @t: The GstClockTime to convert
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* @ts: The target timespec
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*
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* Convert a #GstClockTime to a struct timespec (see man pselect)
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*/
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#define GST_TIME_TO_TIMESPEC(t,ts) \
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G_STMT_START { \
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(ts).tv_sec = (t) / GST_SECOND; \
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(ts).tv_nsec = ((t) - (ts).tv_sec * GST_SECOND) / GST_NSECOND; \
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} G_STMT_END
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/* timestamp debugging macros */
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/**
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* GST_TIME_FORMAT:
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*
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* A format that can be used in printf like format strings to format
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* a GstClockTime value.
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*/
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#define GST_TIME_FORMAT "u:%02u:%02u.%09u"
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/**
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* GST_TIME_ARGS:
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* @t: a #GstClockTime
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*
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* Format @t for the GST_TIME_FORMAT format string.
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*/
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#define GST_TIME_ARGS(t) \
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GST_CLOCK_TIME_IS_VALID (t) ? \
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(guint) (((GstClockTime)(t)) / (GST_SECOND * 60 * 60)) : 99, \
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GST_CLOCK_TIME_IS_VALID (t) ? \
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(guint) ((((GstClockTime)(t)) / (GST_SECOND * 60)) % 60) : 99, \
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GST_CLOCK_TIME_IS_VALID (t) ? \
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(guint) ((((GstClockTime)(t)) / GST_SECOND) % 60) : 99, \
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GST_CLOCK_TIME_IS_VALID (t) ? \
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(guint) (((GstClockTime)(t)) % GST_SECOND) : 999999999
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/**
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* GST_CLOCK_ENTRY_TRACE_NAME:
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*
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* The name used for tracing clock entry allocations.
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*/
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#define GST_CLOCK_ENTRY_TRACE_NAME "GstClockEntry"
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typedef struct _GstClockEntry GstClockEntry;
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typedef struct _GstClock GstClock;
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typedef struct _GstClockClass GstClockClass;
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/* --- prototype for async callbacks --- */
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/**
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* GstClockCallback:
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* @clock: The clock that triggered the callback
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* @time: The time it was triggered
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* @id: The #GstClockID that expired
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* @user_data: user data passed in the gst_clock_id_wait_async() function
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*
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* The function prototype of the callback.
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*
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* Returns: %TRUE or %FALSE (currently unused)
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*/
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typedef gboolean (*GstClockCallback) (GstClock *clock, GstClockTime time,
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GstClockID id, gpointer user_data);
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/**
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* GstClockReturn:
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* @GST_CLOCK_OK: The operation succeded.
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* @GST_CLOCK_EARLY: The operation was scheduled too late.
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* @GST_CLOCK_UNSCHEDULED: The clockID was unscheduled
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* @GST_CLOCK_BUSY: The ClockID is busy
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* @GST_CLOCK_BADTIME: A bad time was provided to a function.
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* @GST_CLOCK_ERROR: An error occured
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* @GST_CLOCK_UNSUPPORTED: Operation is not supported
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*
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* The return value of a clock operation.
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*/
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typedef enum
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{
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GST_CLOCK_OK = 0,
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GST_CLOCK_EARLY = 1,
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GST_CLOCK_UNSCHEDULED = 2,
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GST_CLOCK_BUSY = 3,
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GST_CLOCK_BADTIME = 4,
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GST_CLOCK_ERROR = 5,
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GST_CLOCK_UNSUPPORTED = 6
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} GstClockReturn;
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/**
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* GstClockEntryType:
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* @GST_CLOCK_ENTRY_SINGLE: a single shot timeout
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* @GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
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*
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* The type of the clock entry
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*/
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typedef enum {
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GST_CLOCK_ENTRY_SINGLE,
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GST_CLOCK_ENTRY_PERIODIC
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} GstClockEntryType;
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/**
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* GST_CLOCK_ENTRY:
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* @entry: the entry to cast
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*
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* Cast to a clock entry
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*/
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#define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
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/**
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* GST_CLOCK_ENTRY_CLOCK:
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* @entry: the entry to query
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*
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* Get the owner clock of the entry
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*/
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#define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
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/**
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* GST_CLOCK_ENTRY_TYPE:
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* @entry: the entry to query
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*
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* Get the type of the clock entry
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*/
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#define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
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/**
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* GST_CLOCK_ENTRY_TIME:
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* @entry: the entry to query
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*
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* Get the requested time of this entry
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*/
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#define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
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/**
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* GST_CLOCK_ENTRY_INTERVAL:
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* @entry: the entry to query
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*
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* Get the interval of this periodic entry
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*/
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#define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
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/**
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* GST_CLOCK_ENTRY_STATUS:
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* @entry: the entry to query
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*
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* The status of the entry
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*/
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#define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
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/**
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* GstClockEntry:
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* @refcount: reference counter (read-only)
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*
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* All pending timeouts or periodic notifies are converted into
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* an entry.
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*/
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struct _GstClockEntry {
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gint refcount;
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/*< protected >*/
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GstClock *clock;
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GstClockEntryType type;
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GstClockTime time;
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GstClockTime interval;
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GstClockReturn status;
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GstClockCallback func;
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gpointer user_data;
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};
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/**
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* GstClockFlags:
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* @GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: clock can do a single sync timeout request
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* @GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: clock can do a single async timeout request
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* @GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: clock can do sync periodic timeout requests
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* @GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: clock can do async periodic timeout callbacks
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* @GST_CLOCK_FLAG_CAN_SET_RESOLUTION: clock's resolution can be changed
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* @GST_CLOCK_FLAG_CAN_SET_MASTER: clock can be slaved to a master clock
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* @GST_CLOCK_FLAG_LAST: subclasses can add additional flags starting from this flag
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*
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* The capabilities of this clock
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*/
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typedef enum {
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GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
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GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
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GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
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GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
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GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
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GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
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/* padding */
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GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
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} GstClockFlags;
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/**
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* GST_CLOCK_FLAGS:
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* @clock: the clock to query
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*
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* Gets the #GstClockFlags clock flags.
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*/
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#define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
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/**
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* GST_CLOCK_COND:
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* @clock: the clock to query
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*
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* Gets the #GCond that gets signaled when the entries of the clock
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* changed.
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*/
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#define GST_CLOCK_COND(clock) (GST_CLOCK_CAST(clock)->entries_changed)
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/**
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* GST_CLOCK_WAIT:
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* @clock: the clock to wait on
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*
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* Wait on the clock until the entries changed.
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*/
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#define GST_CLOCK_WAIT(clock) g_cond_wait(GST_CLOCK_COND(clock),GST_OBJECT_GET_LOCK(clock))
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/**
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* GST_CLOCK_TIMED_WAIT:
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* @clock: the clock to wait on
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* @tv: a GTimeVal to wait.
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*
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* Wait on the clock until the entries changed or the specified timeout
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* occured.
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*/
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#define GST_CLOCK_TIMED_WAIT(clock,tv) g_cond_timed_wait(GST_CLOCK_COND(clock),GST_OBJECT_GET_LOCK(clock),tv)
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/**
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* GST_CLOCK_BROADCAST:
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* @clock: the clock to broadcast
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*
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* Signal that the entries in the clock have changed.
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*/
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#define GST_CLOCK_BROADCAST(clock) g_cond_broadcast(GST_CLOCK_COND(clock))
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/**
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* GstClock:
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*
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* GstClock base structure. The values of this structure are
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* protected for subclasses, use the methods to use the #GstClock.
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*/
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struct _GstClock {
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GstObject object;
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GMutex *slave_lock; /* order: SLAVE_LOCK, OBJECT_LOCK */
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/*< protected >*/ /* with LOCK */
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GstClockTime internal_calibration;
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GstClockTime external_calibration;
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GstClockTime rate_numerator;
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GstClockTime rate_denominator;
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GstClockTime last_time;
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GList *entries;
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GCond *entries_changed;
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/*< private >*/ /* with LOCK */
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GstClockTime resolution;
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gboolean stats;
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/* for master/slave clocks */
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GstClock *master;
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/* with SLAVE_LOCK */
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gboolean filling;
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gint window_size;
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gint window_threshold;
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gint time_index;
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GstClockTime timeout;
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GstClockTime *times;
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GstClockID clockid;
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/*< private >*/
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GstClockTime _gst_reserved[GST_PADDING];
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};
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/**
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* GstClockClass:
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* @parent_class: the parent class structure
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* @change_resolution: change the resolution of the clock. Not all values might
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* be acceptable. The new resolution should be returned.
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* @get_resolution: get the resolution of the clock.
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* @get_internal_time: get the internal unadjusted time of the clock.
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* @wait: perform a blocking wait for the given GstClockEntry. Deprecated,
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* implement @wait_jitter instead.
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* @wait_async: perform an asynchronous wait for the given GstClockEntry.
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* @unschedule: unblock a blocking or async wait operation.
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* @wait_jitter: perform a blocking wait on the given GstClockEntry and return
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* the jitter. (Since: 0.10.10)
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*
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* GStreamer clock class. Override the vmethods to implement the clock
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* functionality.
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*/
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struct _GstClockClass {
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GstObjectClass parent_class;
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/*< public >*/
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/* vtable */
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GstClockTime (*change_resolution) (GstClock *clock,
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GstClockTime old_resolution,
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GstClockTime new_resolution);
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GstClockTime (*get_resolution) (GstClock *clock);
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GstClockTime (*get_internal_time) (GstClock *clock);
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/* waiting on an ID */
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GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry);
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GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
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void (*unschedule) (GstClock *clock, GstClockEntry *entry);
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/* ABI added to replace the deprecated wait */
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GstClockReturn (*wait_jitter) (GstClock *clock, GstClockEntry *entry,
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GstClockTimeDiff *jitter);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING - 1];
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};
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GType gst_clock_get_type (void);
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GstClockTime gst_clock_set_resolution (GstClock *clock,
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GstClockTime resolution);
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GstClockTime gst_clock_get_resolution (GstClock *clock);
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GstClockTime gst_clock_get_time (GstClock *clock);
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void gst_clock_set_calibration (GstClock *clock, GstClockTime internal,
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GstClockTime external,
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GstClockTime rate_num,
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GstClockTime rate_denom);
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void gst_clock_get_calibration (GstClock *clock, GstClockTime *internal,
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GstClockTime *external,
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GstClockTime *rate_num,
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GstClockTime *rate_denom);
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/* master/slave clocks */
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gboolean gst_clock_set_master (GstClock *clock, GstClock *master);
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GstClock* gst_clock_get_master (GstClock *clock);
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gboolean gst_clock_add_observation (GstClock *clock, GstClockTime slave,
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GstClockTime master, gdouble *r_squared);
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/* getting and adjusting internal/external time */
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GstClockTime gst_clock_get_internal_time (GstClock *clock);
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GstClockTime gst_clock_adjust_unlocked (GstClock *clock, GstClockTime internal);
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GstClockTime gst_clock_unadjust_unlocked (GstClock * clock, GstClockTime external);
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/* creating IDs that can be used to get notifications */
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GstClockID gst_clock_new_single_shot_id (GstClock *clock,
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GstClockTime time);
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GstClockID gst_clock_new_periodic_id (GstClock *clock,
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GstClockTime start_time,
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GstClockTime interval);
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/* reference counting */
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GstClockID gst_clock_id_ref (GstClockID id);
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void gst_clock_id_unref (GstClockID id);
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/* operations on IDs */
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gint gst_clock_id_compare_func (gconstpointer id1, gconstpointer id2);
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GstClockTime gst_clock_id_get_time (GstClockID id);
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GstClockReturn gst_clock_id_wait (GstClockID id,
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GstClockTimeDiff *jitter);
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GstClockReturn gst_clock_id_wait_async (GstClockID id,
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GstClockCallback func,
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gpointer user_data);
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void gst_clock_id_unschedule (GstClockID id);
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G_END_DECLS
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#endif /* __GST_CLOCK_H__ */
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