56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
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/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "common_video/frame_rate_estimator.h"
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#include "rtc_base/time_utils.h"
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namespace webrtc {
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FrameRateEstimator::FrameRateEstimator(TimeDelta averaging_window)
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: averaging_window_(averaging_window) {}
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void FrameRateEstimator::OnFrame(Timestamp time) {
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CullOld(time);
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frame_times_.push_back(time);
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}
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absl::optional<double> FrameRateEstimator::GetAverageFps() const {
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if (frame_times_.size() < 2) {
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return absl::nullopt;
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}
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TimeDelta time_span = frame_times_.back() - frame_times_.front();
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if (time_span < TimeDelta::Micros(1)) {
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return absl::nullopt;
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}
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TimeDelta avg_frame_interval = time_span / (frame_times_.size() - 1);
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return static_cast<double>(rtc::kNumMicrosecsPerSec) /
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avg_frame_interval.us();
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}
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absl::optional<double> FrameRateEstimator::GetAverageFps(Timestamp now) {
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CullOld(now);
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return GetAverageFps();
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}
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void FrameRateEstimator::Reset() {
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frame_times_.clear();
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}
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void FrameRateEstimator::CullOld(Timestamp now) {
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while (!frame_times_.empty() &&
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frame_times_.front() + averaging_window_ < now) {
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frame_times_.pop_front();
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}
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}
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} // namespace webrtc
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