blob: 8a457cb3d7b759238b3fd8c195dafbd7d7992282 [file] [log] [blame]
* Copyright (c) 2018 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 <stddef.h>
#include <vector>
#include "absl/types/optional.h"
#include "rtc_base/constructor_magic.h"
namespace webrtc {
// Estimator of API call skew between render and capture.
class SkewEstimator {
explicit SkewEstimator(size_t skew_history_size_log2);
// Resets the estimation.
void Reset();
// Updates the skew data for a render call.
void LogRenderCall() { ++skew_; }
// Updates and computes the skew at a capture call. Returns an optional which
// is non-null if a reliable skew has been found.
absl::optional<int> GetSkewFromCapture();
const int skew_history_size_log2_;
std::vector<float> skew_history_;
int skew_ = 0;
int skew_sum_ = 0;
size_t next_index_ = 0;
bool sufficient_skew_stored_ = false;
} // namespace webrtc