blob: 0bd3a82afcfe0e33d2874a541483d07279a87201 [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 <stdint.h>
#include <memory>
#include "api/units/time_delta.h"
#include "rtc_base/experiments/field_trial_parser.h"
namespace webrtc {
struct ReceiveTimeCalculatorConfig {
ReceiveTimeCalculatorConfig(const ReceiveTimeCalculatorConfig&);
ReceiveTimeCalculatorConfig& operator=(const ReceiveTimeCalculatorConfig&) =
FieldTrialParameter<TimeDelta> max_packet_time_repair;
FieldTrialParameter<TimeDelta> stall_threshold;
FieldTrialParameter<TimeDelta> tolerance;
FieldTrialParameter<TimeDelta> max_stall;
// The receive time calculator serves the purpose of combining packet time
// stamps with a safely incremental clock. This assumes that the packet time
// stamps are based on lower layer timestamps that have more accurate time
// increments since they are based on the exact receive time. They might
// however, have large jumps due to clock resets in the system. To compensate
// this they are combined with a safe clock source that is guaranteed to be
// consistent, but it will not be able to measure the exact time when a packet
// is received.
class ReceiveTimeCalculator {
static std::unique_ptr<ReceiveTimeCalculator> CreateFromFieldTrial();
int64_t ReconcileReceiveTimes(int64_t packet_time_us_,
int64_t system_time_us_,
int64_t safe_time_us_);
int64_t last_corrected_time_us_ = -1;
int64_t last_packet_time_us_ = -1;
int64_t last_system_time_us_ = -1;
int64_t last_safe_time_us_ = -1;
int64_t total_system_time_passed_us_ = 0;
int64_t static_clock_offset_us_ = 0;
int64_t small_reset_during_stall_ = false;
ReceiveTimeCalculatorConfig config_;
} // namespace webrtc