timer: convert to class

1 files changed, 80 insertions, 0 deletions

diff --git a/src/Timer.cxx b/src/Timer.cxx
new file mode 100644
index 000000000..7ddbda3da
--- /dev/null
+++ b/src/Timer.cxx
@@ -0,0 +1,80 @@
+/*
+ * 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.hxx"
+#include "audio_format.h"
+#include "clock.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <limits.h>
+#include <stddef.h>
+
+Timer::Timer(const struct audio_format &af)
+	: time(0),
+	  started(false),
+	  rate(af.sample_rate * audio_format_frame_size(&af))
+{
+}
+
+void Timer::Start()
+{
+	time = monotonic_clock_us();
+	started = true;
+}
+
+void Timer::Reset()
+{
+	time = 0;
+	started = false;
+}
+
+void Timer::Add(int size)
+{
+	assert(started);
+
+	// (size samples) / (rate samples per second) = duration seconds
+	// duration seconds * 1000000 = duration us
+	time += ((uint64_t)size * 1000000) / rate;
+}
+
+unsigned Timer::GetDelay() const
+{
+	int64_t delay = (int64_t)(time - monotonic_clock_us()) / 1000;
+	if (delay < 0)
+		return 0;
+
+	if (delay > G_MAXINT)
+		delay = G_MAXINT;
+
+	return delay;
+}
+
+void Timer::Synchronize() const
+{
+	int64_t sleep_duration;
+
+	assert(started);
+
+	sleep_duration = time - monotonic_clock_us();
+	if (sleep_duration > 0)
+		g_usleep(sleep_duration);
+}