/* * Copyright (C) 2003-2011 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include "timer.h" #include "audio_format.h" #include <glib.h> #include <assert.h> #include <limits.h> #include <sys/time.h> #include <stddef.h> static uint64_t now(void) { struct timeval tv; gettimeofday(&tv, NULL); return ((uint64_t)tv.tv_sec * 1000000) + tv.tv_usec; } struct timer *timer_new(const struct audio_format *af) { struct timer *timer = g_new(struct timer, 1); timer->time = 0; timer->started = 0; timer->rate = af->sample_rate * audio_format_frame_size(af); return timer; } void timer_free(struct timer *timer) { g_free(timer); } void timer_start(struct timer *timer) { timer->time = now(); timer->started = 1; } void timer_reset(struct timer *timer) { timer->time = 0; timer->started = 0; } void timer_add(struct timer *timer, int size) { assert(timer->started); timer->time += ((uint64_t)size * 1000000) / timer->rate; } unsigned timer_delay(const struct timer *timer) { int64_t delay = (int64_t)(timer->time - now()) / 1000; if (delay < 0) return 0; if (delay > G_MAXINT) delay = G_MAXINT; return delay / 1000; } void timer_sync(struct timer *timer) { int64_t sleep_duration; assert(timer->started); sleep_duration = timer->time - now(); if (sleep_duration > 0) g_usleep(sleep_duration); }