1/*
2 *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/voice_engine/network_predictor.h"
12
13namespace webrtc {
14namespace voe {
15
16NetworkPredictor::NetworkPredictor(Clock* clock)
17    : clock_(clock),
18      last_loss_rate_update_time_ms_(clock_->TimeInMilliseconds()),
19      loss_rate_filter_(new rtc::ExpFilter(0.9999f)) {
20}
21
22uint8_t NetworkPredictor::GetLossRate() {
23  float value = loss_rate_filter_->filtered();
24  return (value == rtc::ExpFilter::kValueUndefined) ? 0 :
25      static_cast<uint8_t>(value + 0.5);
26}
27
28void NetworkPredictor::UpdatePacketLossRate(uint8_t loss_rate) {
29  int64_t now_ms = clock_->TimeInMilliseconds();
30  // Update the recursive average filter.
31  loss_rate_filter_->Apply(
32      static_cast<float>(now_ms - last_loss_rate_update_time_ms_),
33      static_cast<float>(loss_rate));
34  last_loss_rate_update_time_ms_ = now_ms;
35}
36
37}  // namespace voe
38}  // namespace webrtc
39