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 <math.h>
12
13#include "testing/gtest/include/gtest/gtest.h"
14#include "webrtc/voice_engine/network_predictor.h"
15#include "webrtc/system_wrappers/interface/clock.h"
16
17namespace webrtc {
18namespace voe {
19
20class TestNetworkPredictor : public ::testing::Test {
21 protected:
22  TestNetworkPredictor()
23      : clock_(0),
24        network_predictor_(new NetworkPredictor(&clock_)) {}
25  SimulatedClock clock_;
26  scoped_ptr<NetworkPredictor> network_predictor_;
27};
28
29TEST_F(TestNetworkPredictor, TestPacketLossRateFilter) {
30  // Test initial packet loss rate estimate is 0.
31  EXPECT_EQ(0, network_predictor_->GetLossRate());
32  network_predictor_->UpdatePacketLossRate(32);
33  // First time, no filtering.
34  EXPECT_EQ(32, network_predictor_->GetLossRate());
35  clock_.AdvanceTimeMilliseconds(1000);
36  network_predictor_->UpdatePacketLossRate(40);
37  float exp = pow(0.9999f, 1000);
38  float value = 32.0f * exp + (1 - exp) * 40.0f;
39  EXPECT_EQ(static_cast<uint8_t>(value + 0.5f),
40            network_predictor_->GetLossRate());
41}
42}  // namespace voe
43}  // namespace webrtc
44