Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/frequency_tracker.h

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+/*
+ *  Copyright (c) 2023 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 RTC_BASE_FREQUENCY_TRACKER_H_
+#define RTC_BASE_FREQUENCY_TRACKER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "absl/types/optional.h"
+#include "api/units/frequency.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/rate_statistics.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+// Class to estimate frequency (e.g. frame rate) over running window.
+// Timestamps used in Update() and Rate() must never decrease for two
+// consecutive calls.
+// This class is thread unsafe.
+class RTC_EXPORT FrequencyTracker {
+ public:
+  explicit FrequencyTracker(TimeDelta window_size);
+
+  FrequencyTracker(const FrequencyTracker&) = default;
+  FrequencyTracker(FrequencyTracker&&) = default;
+  FrequencyTracker& operator=(const FrequencyTracker&) = delete;
+  FrequencyTracker& operator=(FrequencyTracker&&) = delete;
+
+  ~FrequencyTracker() = default;
+
+  // Reset instance to original state.
+  void Reset() { impl_.Reset(); }
+
+  // Update rate with a new data point, moving averaging window as needed.
+  void Update(int64_t count, Timestamp now);
+  void Update(Timestamp now) { Update(1, now); }
+
+  // Returns rate, moving averaging window as needed.
+  // Returns nullopt when rate can't be measured.
+  absl::optional<Frequency> Rate(Timestamp now) const;
+
+ private:
+  RateStatistics impl_;
+};
+}  // namespace webrtc
+
+#endif  // RTC_BASE_FREQUENCY_TRACKER_H_