/* * 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.
*/
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);
// 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.
std::optional<Frequency> Rate(Timestamp now) const;
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