Move the timing code from the null plugin to timer.c, so it can be easily

used in other plugins (fifo, shout, etc.).

git-svn-id: https://svn.musicpd.org/mpd/trunk@6397 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/timer.c

@@ -0,0 +1,80 @@
+/* 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);
+}