diff options
Diffstat (limited to 'third_party/libwebrtc/common_video/frame_rate_estimator.cc')
-rw-r--r-- | third_party/libwebrtc/common_video/frame_rate_estimator.cc | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_video/frame_rate_estimator.cc b/third_party/libwebrtc/common_video/frame_rate_estimator.cc new file mode 100644 index 0000000000..4c5a341ac0 --- /dev/null +++ b/third_party/libwebrtc/common_video/frame_rate_estimator.cc @@ -0,0 +1,55 @@ +/* + * 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 "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); +} + +absl::optional<double> FrameRateEstimator::GetAverageFps() const { + if (frame_times_.size() < 2) { + return absl::nullopt; + } + TimeDelta time_span = frame_times_.back() - frame_times_.front(); + if (time_span < TimeDelta::Micros(1)) { + return absl::nullopt; + } + TimeDelta avg_frame_interval = time_span / (frame_times_.size() - 1); + + return static_cast<double>(rtc::kNumMicrosecsPerSec) / + avg_frame_interval.us(); +} + +absl::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 |