1#ifndef footimevalhfoo
2#define footimevalhfoo
3
4/***
5 This file is part of PulseAudio.
6
7 Copyright 2004-2006 Lennart Poettering
8 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
9
10 PulseAudio is free software; you can redistribute it and/or modify
11 it under the terms of the GNU Lesser General Public License as
12 published by the Free Software Foundation; either version 2.1 of the
13 License, or (at your option) any later version.
14
15 PulseAudio is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
19
20 You should have received a copy of the GNU Lesser General Public
21 License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
22***/
23
24#include <pulse/cdecl.h>
25#include <pulse/gccmacro.h>
26#include <pulse/sample.h>
27#include <pulse/version.h>
28
29/** \file
30 * Utility functions for handling timeval calculations */
31
32PA_C_DECL_BEGIN
33
34/** The number of milliseconds in a second */
35#define PA_MSEC_PER_SEC ((pa_usec_t) 1000ULL)
36
37/** The number of microseconds in a second */
38#define PA_USEC_PER_SEC ((pa_usec_t) 1000000ULL)
39
40/** The number of nanoseconds in a second */
41#define PA_NSEC_PER_SEC ((unsigned long long) 1000000000ULL)
42
43/** The number of microseconds in a millisecond */
44#define PA_USEC_PER_MSEC ((pa_usec_t) 1000ULL)
45
46/** The number of nanoseconds in a millisecond */
47#define PA_NSEC_PER_MSEC ((unsigned long long) 1000000ULL)
48
49/** The number of nanoseconds in a microsecond */
50#define PA_NSEC_PER_USEC ((unsigned long long) 1000ULL)
51
52/** Invalid time in usec. \since 0.9.15 */
53#define PA_USEC_INVALID ((pa_usec_t) -1)
54
55/** Biggest time in usec. \since 0.9.18 */
56#define PA_USEC_MAX ((pa_usec_t) -2)
57
58struct timeval;
59
60/** Return the current wallclock timestamp, just like UNIX gettimeofday(). */
61struct timeval *pa_gettimeofday(struct timeval *tv);
62
63/** Calculate the difference between the two specified timeval
64 * structs. */
65pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) PA_GCC_PURE;
66
67/** Compare the two timeval structs and return 0 when equal, negative when a < b, positive otherwise */
68int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) PA_GCC_PURE;
69
70/** Return the time difference between now and the specified timestamp */
71pa_usec_t pa_timeval_age(const struct timeval *tv);
72
73/** Add the specified time in microseconds to the specified timeval structure */
74struct timeval* pa_timeval_add(struct timeval *tv, pa_usec_t v);
75
76/** Subtract the specified time in microseconds to the specified timeval structure. \since 0.9.11 */
77struct timeval* pa_timeval_sub(struct timeval *tv, pa_usec_t v);
78
79/** Store the specified usec value in the timeval struct. \since 0.9.7 */
80struct timeval* pa_timeval_store(struct timeval *tv, pa_usec_t v);
81
82/** Load the specified tv value and return it in usec. \since 0.9.7 */
83pa_usec_t pa_timeval_load(const struct timeval *tv);
84
85PA_C_DECL_END
86
87#endif
88

source code of include/pulse/timeval.h