Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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