henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2011 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 <limits.h> |
| 12 | |
| 13 | #include "webrtc/base/bandwidthsmoother.h" |
| 14 | #include "webrtc/base/gunit.h" |
| 15 | |
| 16 | namespace rtc { |
| 17 | |
| 18 | static const int kTimeBetweenIncrease = 10; |
| 19 | static const double kPercentIncrease = 1.1; |
| 20 | static const size_t kSamplesCountToAverage = 2; |
| 21 | static const double kMinSampleCountPercent = 1.0; |
| 22 | |
| 23 | TEST(BandwidthSmootherTest, TestSampleIncrease) { |
| 24 | BandwidthSmoother mon(1000, // initial_bandwidth_guess |
| 25 | kTimeBetweenIncrease, |
| 26 | kPercentIncrease, |
| 27 | kSamplesCountToAverage, |
| 28 | kMinSampleCountPercent); |
| 29 | |
| 30 | int bandwidth_sample = 1000; |
| 31 | EXPECT_EQ(bandwidth_sample, mon.get_bandwidth_estimation()); |
| 32 | bandwidth_sample = |
| 33 | static_cast<int>(bandwidth_sample * kPercentIncrease); |
| 34 | EXPECT_FALSE(mon.Sample(9, bandwidth_sample)); |
| 35 | EXPECT_TRUE(mon.Sample(10, bandwidth_sample)); |
| 36 | EXPECT_EQ(bandwidth_sample, mon.get_bandwidth_estimation()); |
| 37 | int next_expected_est = |
| 38 | static_cast<int>(bandwidth_sample * kPercentIncrease); |
| 39 | bandwidth_sample *= 2; |
| 40 | EXPECT_TRUE(mon.Sample(20, bandwidth_sample)); |
| 41 | EXPECT_EQ(next_expected_est, mon.get_bandwidth_estimation()); |
| 42 | } |
| 43 | |
| 44 | TEST(BandwidthSmootherTest, TestSampleIncreaseFromZero) { |
| 45 | BandwidthSmoother mon(0, // initial_bandwidth_guess |
| 46 | kTimeBetweenIncrease, |
| 47 | kPercentIncrease, |
| 48 | kSamplesCountToAverage, |
| 49 | kMinSampleCountPercent); |
| 50 | |
| 51 | const int kBandwidthSample = 1000; |
| 52 | EXPECT_EQ(0, mon.get_bandwidth_estimation()); |
| 53 | EXPECT_FALSE(mon.Sample(9, kBandwidthSample)); |
| 54 | EXPECT_TRUE(mon.Sample(10, kBandwidthSample)); |
| 55 | EXPECT_EQ(kBandwidthSample, mon.get_bandwidth_estimation()); |
| 56 | } |
| 57 | |
| 58 | TEST(BandwidthSmootherTest, TestSampleDecrease) { |
| 59 | BandwidthSmoother mon(1000, // initial_bandwidth_guess |
| 60 | kTimeBetweenIncrease, |
| 61 | kPercentIncrease, |
| 62 | kSamplesCountToAverage, |
| 63 | kMinSampleCountPercent); |
| 64 | |
| 65 | const int kBandwidthSample = 999; |
| 66 | EXPECT_EQ(1000, mon.get_bandwidth_estimation()); |
| 67 | EXPECT_FALSE(mon.Sample(1, kBandwidthSample)); |
| 68 | EXPECT_EQ(1000, mon.get_bandwidth_estimation()); |
| 69 | EXPECT_TRUE(mon.Sample(2, kBandwidthSample)); |
| 70 | EXPECT_EQ(kBandwidthSample, mon.get_bandwidth_estimation()); |
| 71 | } |
| 72 | |
| 73 | TEST(BandwidthSmootherTest, TestSampleTooFewSamples) { |
| 74 | BandwidthSmoother mon(1000, // initial_bandwidth_guess |
| 75 | kTimeBetweenIncrease, |
| 76 | kPercentIncrease, |
| 77 | 10, // 10 samples. |
| 78 | 0.5); // 5 min samples. |
| 79 | |
| 80 | const int kBandwidthSample = 500; |
| 81 | EXPECT_EQ(1000, mon.get_bandwidth_estimation()); |
| 82 | EXPECT_FALSE(mon.Sample(1, kBandwidthSample)); |
| 83 | EXPECT_FALSE(mon.Sample(2, kBandwidthSample)); |
| 84 | EXPECT_FALSE(mon.Sample(3, kBandwidthSample)); |
| 85 | EXPECT_FALSE(mon.Sample(4, kBandwidthSample)); |
| 86 | EXPECT_EQ(1000, mon.get_bandwidth_estimation()); |
| 87 | EXPECT_TRUE(mon.Sample(5, kBandwidthSample)); |
| 88 | EXPECT_EQ(kBandwidthSample, mon.get_bandwidth_estimation()); |
| 89 | } |
| 90 | |
| 91 | TEST(BandwidthSmootherTest, TestSampleRollover) { |
| 92 | const int kHugeBandwidth = 2000000000; // > INT_MAX/1.1 |
| 93 | BandwidthSmoother mon(kHugeBandwidth, |
| 94 | kTimeBetweenIncrease, |
| 95 | kPercentIncrease, |
| 96 | kSamplesCountToAverage, |
| 97 | kMinSampleCountPercent); |
| 98 | |
| 99 | EXPECT_FALSE(mon.Sample(10, INT_MAX)); |
| 100 | EXPECT_FALSE(mon.Sample(11, INT_MAX)); |
| 101 | EXPECT_EQ(kHugeBandwidth, mon.get_bandwidth_estimation()); |
| 102 | } |
| 103 | |
| 104 | TEST(BandwidthSmootherTest, TestSampleNegative) { |
| 105 | BandwidthSmoother mon(1000, // initial_bandwidth_guess |
| 106 | kTimeBetweenIncrease, |
| 107 | kPercentIncrease, |
| 108 | kSamplesCountToAverage, |
| 109 | kMinSampleCountPercent); |
| 110 | |
| 111 | EXPECT_FALSE(mon.Sample(10, -1)); |
| 112 | EXPECT_FALSE(mon.Sample(11, -1)); |
| 113 | EXPECT_EQ(1000, mon.get_bandwidth_estimation()); |
| 114 | } |
| 115 | |
| 116 | } // namespace rtc |