chromium/media/cast/logging/receiver_time_offset_estimator_impl.h

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_IMPL_H_
#define MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_IMPL_H_

#include <stddef.h>
#include <stdint.h>

#include <map>

#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "media/cast/common/mod_util.h"
#include "media/cast/logging/logging_defines.h"
#include "media/cast/logging/receiver_time_offset_estimator.h"

namespace media {
namespace cast {


// This should be large enough so that we can collect all 3 events before
// the entry gets removed from the map.
const size_t kMaxEventTimesMapSize = …;

// The lower, this is, the faster we adjust to clock drift.
// (But with more jitter.)
const size_t kClockDriftSpeed = …;


// This implementation listens to two pair of events
// 1. FRAME_ACK_SENT / FRAME_ACK_RECEIVED  (receiver->sender)
// 2. PACKET_SENT_TO_NETWORK / PACKET_RECEIVED (sender->receiver)
// There is a causal relationship between these events in that these events
// must happen in order. This class obtains the lower and upper bounds for
// the offset by taking the difference of timestamps.
class ReceiverTimeOffsetEstimatorImpl final
    : public ReceiverTimeOffsetEstimator { … };

}  // namespace cast
}  // namespace media

#endif  // MEDIA_CAST_LOGGING_RECEIVER_TIME_OFFSET_ESTIMATOR_IMPL_H_