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-rw-r--r--src/timer.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/timer.c b/src/timer.c
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+++ b/src/timer.c
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+/* 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 "utils.h"
+
+#include <assert.h>
+#include <limits.h>
+#include <sys/time.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(AudioFormat *af)
+{
+ Timer *timer;
+
+ timer = xmalloc(sizeof(Timer));
+ timer->time = 0;
+ timer->started = 0;
+ timer->rate = af->sampleRate * (af->bits / CHAR_BIT) * af->channels;
+
+ return timer;
+}
+
+void timer_free(Timer *timer)
+{
+ 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;
+
+ assert(timer->started);
+
+ sleep = timer->time - now();
+ if (sleep > 0)
+ my_usleep(sleep);
+}