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/*
* Copyright (c) 2019 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.
*/
#include "common_video/frame_rate_estimator.h"
#include <optional>
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/time_utils.h"
namespace webrtc {
FrameRateEstimator::FrameRateEstimator(TimeDelta averaging_window)
: averaging_window_(averaging_window) {}
void FrameRateEstimator::OnFrame(Timestamp time) {
CullOld(time);
frame_times_.push_back(time);
}
std::optional<double> FrameRateEstimator::GetAverageFps() const {
if (frame_times_.size() < 2) {
return std::nullopt;
}
TimeDelta time_span = frame_times_.back() - frame_times_.front();
if (time_span < TimeDelta::Micros(1)) {
return std::nullopt;
}
TimeDelta avg_frame_interval = time_span / (frame_times_.size() - 1);
return static_cast<double>(kNumMicrosecsPerSec) / avg_frame_interval.us();
}
std::optional<double> FrameRateEstimator::GetAverageFps(Timestamp now) {
CullOld(now);
return GetAverageFps();
}
void FrameRateEstimator::Reset() {
frame_times_.clear();
}
void FrameRateEstimator::CullOld(Timestamp now) {
while (!frame_times_.empty() &&
frame_times_.front() + averaging_window_ < now) {
frame_times_.pop_front();
}
}
} // namespace webrtc
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