83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "timer.h"
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#include "audio_format.h"
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#include <glib.h>
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#include <assert.h>
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#include <limits.h>
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#include <sys/time.h>
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#include <stddef.h>
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static uint64_t now(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return ((uint64_t)tv.tv_sec * 1000000) + tv.tv_usec;
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}
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Timer *timer_new(const struct audio_format *af)
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{
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Timer *timer = g_new(Timer, 1);
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timer->time = 0;
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timer->started = 0;
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timer->rate = af->sample_rate * audio_format_frame_size(af);
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return timer;
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}
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void timer_free(Timer *timer)
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{
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g_free(timer);
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}
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void timer_start(Timer *timer)
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{
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timer->time = now();
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timer->started = 1;
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}
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void timer_reset(Timer *timer)
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{
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timer->time = 0;
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timer->started = 0;
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}
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void timer_add(Timer *timer, int size)
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{
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assert(timer->started);
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timer->time += ((uint64_t)size * 1000000) / timer->rate;
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}
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void timer_sync(Timer *timer)
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{
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int64_t sleep_duration;
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assert(timer->started);
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sleep_duration = timer->time - now();
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if (sleep_duration > 0)
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g_usleep(sleep_duration);
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}
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