Index: webrtc/video/quality_threshold.h |
diff --git a/webrtc/video/quality_threshold.h b/webrtc/video/quality_threshold.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9bd0aaee62f05a4eacb1311e7c14f069594cbc58 |
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+++ b/webrtc/video/quality_threshold.h |
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+/* |
+ * 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_ |