Logging basic bad call detection
BUG=webrtc:6814
Review-Url: https://codereview.webrtc.org/2474913002
Cr-Commit-Position: refs/heads/master@{#15568}
diff --git a/webrtc/video/quality_threshold.h b/webrtc/video/quality_threshold.h
new file mode 100644
index 0000000..9bd0aaee
--- /dev/null
+++ b/webrtc/video/quality_threshold.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2016 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.
+ */
+
+#ifndef WEBRTC_VIDEO_QUALITY_THRESHOLD_H_
+#define WEBRTC_VIDEO_QUALITY_THRESHOLD_H_
+
+#include <memory>
+
+#include "webrtc/base/optional.h"
+
+namespace webrtc {
+
+class QualityThreshold {
+ public:
+ // Both thresholds are inclusive, i.e. measurement >= high signifies a high
+ // state, while measurement <= low signifies a low state.
+ QualityThreshold(int low_threshold,
+ int high_threshold,
+ float fraction,
+ int max_measurements);
+
+ void AddMeasurement(int measurement);
+ rtc::Optional<bool> IsHigh() const;
+ rtc::Optional<double> CalculateVariance() const;
+
+ private:
+ const std::unique_ptr<int[]> buffer_;
+ const int max_measurements_;
+ const float fraction_;
+ const int low_threshold_;
+ const int high_threshold_;
+ int until_full_;
+ int next_index_;
+ rtc::Optional<bool> is_high_;
+ int sum_;
+ int count_low_;
+ int count_high_;
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_VIDEO_QUALITY_THRESHOLD_H_
