chromium/third_party/webrtc/system_wrappers/source/rtp_to_ntp_estimator.cc

/*
 *  Copyright (c) 2012 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 "system_wrappers/include/rtp_to_ntp_estimator.h"

#include <stddef.h>

#include <cmath>
#include <vector>

#include "api/array_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"

namespace webrtc {
namespace {
// Maximum number of RTCP SR reports to use to map between RTP and NTP.
constexpr size_t kNumRtcpReportsToUse = …;
// Don't allow NTP timestamps to jump more than 1 hour. Chosen arbitrary as big
// enough to not affect normal use-cases. Yet it is smaller than RTP wrap-around
// half-period (90khz RTP clock wrap-arounds every 13.25 hours). After half of
// wrap-around period it is impossible to unwrap RTP timestamps correctly.
constexpr uint64_t kMaxAllowedRtcpNtpInterval = …;
}  // namespace

void RtpToNtpEstimator::UpdateParameters() { … }

RtpToNtpEstimator::UpdateResult RtpToNtpEstimator::UpdateMeasurements(
    NtpTime ntp,
    uint32_t rtp_timestamp) { … }

NtpTime RtpToNtpEstimator::Estimate(uint32_t rtp_timestamp) const { … }

double RtpToNtpEstimator::EstimatedFrequencyKhz() const { … }

}  // namespace webrtc