/* the Music Player Daemon (MPD) * Copyright (C) 2007 by Warren Dukes (warren.dukes@gmail.com) * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #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; } Timer *timer_new(const struct audio_format *af) { Timer *timer = g_new(Timer, 1); timer->time = 0; timer->started = 0; timer->rate = af->sample_rate * audio_format_frame_size(af); return timer; } void timer_free(Timer *timer) { g_free(timer); } void timer_start(Timer *timer) { timer->time = now(); timer->started = 1; } void timer_reset(Timer *timer) { timer->time = 0; timer->started = 0; } void timer_add(Timer *timer, int size) { assert(timer->started); timer->time += ((uint64_t)size * 1000000) / timer->rate; } void timer_sync(Timer *timer) { int64_t sleep_duration; assert(timer->started); sleep_duration = timer->time - now(); if (sleep_duration > 0) g_usleep(sleep_duration); }