Initial port of FullStackTest to new VideoEngine API.
Deferring network loss, delay and such to a later CL.
BUG=1872
R=stefan@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/1756004
git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4310 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/test/common/statistics.cc b/video_engine/test/common/statistics.cc
new file mode 100644
index 0000000..f6e339d
--- /dev/null
+++ b/video_engine/test/common/statistics.cc
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+#include "webrtc/video_engine/test/common/statistics.h"
+
+#include <math.h>
+
+namespace webrtc {
+namespace test {
+
+Statistics::Statistics() : sum_(0.0), sum_squared_(0.0), count_(0) {}
+
+void Statistics::AddSample(double sample) {
+ sum_ += sample;
+ sum_squared_ += sample * sample;
+ ++count_;
+}
+
+double Statistics::Mean() const {
+ if (count_ == 0)
+ return 0.0;
+ return sum_ / count_;
+}
+
+double Statistics::Variance() const {
+ if (count_ == 0)
+ return 0.0;
+ return sum_squared_ / count_ - Mean() * Mean();
+}
+
+double Statistics::StandardDeviation() const {
+ return sqrt(Variance());
+}
+} // namespace test
+} // namespace webrtc