88 lines
3 KiB
C++
88 lines
3 KiB
C++
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#ifndef footimevalhfoo
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#define footimevalhfoo
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#include <pulse/cdecl.h>
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#include <pulse/gccmacro.h>
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#include <pulse/sample.h>
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#include <pulse/version.h>
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/** \file
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* Utility functions for handling timeval calculations */
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PA_C_DECL_BEGIN
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/** The number of milliseconds in a second */
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#define PA_MSEC_PER_SEC ((pa_usec_t) 1000ULL)
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/** The number of microseconds in a second */
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#define PA_USEC_PER_SEC ((pa_usec_t) 1000000ULL)
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/** The number of nanoseconds in a second */
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#define PA_NSEC_PER_SEC ((unsigned long long) 1000000000ULL)
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/** The number of microseconds in a millisecond */
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#define PA_USEC_PER_MSEC ((pa_usec_t) 1000ULL)
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/** The number of nanoseconds in a millisecond */
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#define PA_NSEC_PER_MSEC ((unsigned long long) 1000000ULL)
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/** The number of nanoseconds in a microsecond */
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#define PA_NSEC_PER_USEC ((unsigned long long) 1000ULL)
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/** Invalid time in usec. \since 0.9.15 */
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#define PA_USEC_INVALID ((pa_usec_t) -1)
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/** Biggest time in usec. \since 0.9.18 */
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#define PA_USEC_MAX ((pa_usec_t) -2)
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struct timeval;
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/** Return the current wallclock timestamp, just like UNIX gettimeofday(). */
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struct timeval *pa_gettimeofday(struct timeval *tv);
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/** Calculate the difference between the two specified timeval
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* structs. */
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pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) PA_GCC_PURE;
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/** Compare the two timeval structs and return 0 when equal, negative when a < b, positive otherwise */
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int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) PA_GCC_PURE;
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/** Return the time difference between now and the specified timestamp */
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pa_usec_t pa_timeval_age(const struct timeval *tv);
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/** Add the specified time in microseconds to the specified timeval structure */
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struct timeval* pa_timeval_add(struct timeval *tv, pa_usec_t v);
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/** Subtract the specified time in microseconds to the specified timeval structure. \since 0.9.11 */
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struct timeval* pa_timeval_sub(struct timeval *tv, pa_usec_t v);
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/** Store the specified usec value in the timeval struct. \since 0.9.7 */
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struct timeval* pa_timeval_store(struct timeval *tv, pa_usec_t v);
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/** Load the specified tv value and return it in usec. \since 0.9.7 */
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pa_usec_t pa_timeval_load(const struct timeval *tv);
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PA_C_DECL_END
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#endif
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