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| 1 /* |
| 2 * Copyright (c) 2016 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 #include <memory> |
| 11 |
| 12 #include "webrtc/modules/audio_coding/audio_network_adaptor/smoothing_filter.h" |
| 13 #include "webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h" |
| 14 #include "webrtc/test/gtest.h" |
| 15 |
| 16 namespace webrtc { |
| 17 namespace { |
| 18 |
| 19 constexpr int64_t kClockInitialTime = 123456; |
| 20 |
| 21 struct AimdRateControlStates { |
| 22 std::unique_ptr<AimdRateControl> aimd_rate_control; |
| 23 std::unique_ptr<SimulatedClock> simulated_clock; |
| 24 }; |
| 25 |
| 26 AimdRateControlStates CreateAimdRateControlStates() { |
| 27 AimdRateControlStates states; |
| 28 states.aimd_rate_control.reset(new AimdRateControl()); |
| 29 states.simulated_clock.reset(new SimulatedClock(kClockInitialTime)); |
| 30 return states; |
| 31 } |
| 32 |
| 33 void InitBitrate(const AimdRateControlStates& states, |
| 34 int bitrate, |
| 35 int64_t now_ms) { |
| 36 // Reduce the bitrate by 1000 to compensate for the Update after SetEstimate. |
| 37 bitrate -= 1000; |
| 38 |
| 39 states.aimd_rate_control->SetEstimate(bitrate, now_ms); |
| 40 } |
| 41 |
| 42 void UpdateRateControl(const AimdRateControlStates& states, |
| 43 const BandwidthUsage& bandwidth_usage, |
| 44 int bitrate, |
| 45 int64_t now_ms) { |
| 46 RateControlInput input(bandwidth_usage, rtc::Optional<uint32_t>(bitrate), |
| 47 now_ms); |
| 48 states.aimd_rate_control->Update(&input, now_ms); |
| 49 states.aimd_rate_control->UpdateBandwidthEstimate(now_ms); |
| 50 } |
| 51 |
| 52 } // namespace |
| 53 |
| 54 TEST(AimdRateControlTest, MinNearMaxIncreaseRateOnLowBandwith) { |
| 55 auto states = CreateAimdRateControlStates(); |
| 56 constexpr int kBitrate = 30000; |
| 57 InitBitrate(states, kBitrate, states.simulated_clock->TimeInMilliseconds()); |
| 58 EXPECT_EQ(4000, states.aimd_rate_control->GetNearMaxIncreaseRateBps()); |
| 59 } |
| 60 |
| 61 TEST(AimdRateControlTest, NearMaxIncreaseRateIs5kbpsOn90kbpsAnd200msRtt) { |
| 62 auto states = CreateAimdRateControlStates(); |
| 63 constexpr int kBitrate = 90000; |
| 64 InitBitrate(states, kBitrate, states.simulated_clock->TimeInMilliseconds()); |
| 65 EXPECT_EQ(5000, states.aimd_rate_control->GetNearMaxIncreaseRateBps()); |
| 66 } |
| 67 |
| 68 TEST(AimdRateControlTest, NearMaxIncreaseRateIs5kbpsOn60kbpsAnd100msRtt) { |
| 69 auto states = CreateAimdRateControlStates(); |
| 70 constexpr int kBitrate = 60000; |
| 71 InitBitrate(states, kBitrate, states.simulated_clock->TimeInMilliseconds()); |
| 72 states.aimd_rate_control->SetRtt(100); |
| 73 EXPECT_EQ(5000, states.aimd_rate_control->GetNearMaxIncreaseRateBps()); |
| 74 } |
| 75 |
| 76 TEST(AimdRateControlTest, UnknownBitrateDecreaseBeforeFirstOveruse) { |
| 77 auto states = CreateAimdRateControlStates(); |
| 78 EXPECT_EQ(rtc::Optional<int>(), |
| 79 states.aimd_rate_control->GetLastBitrateDecreaseBps()); |
| 80 } |
| 81 |
| 82 TEST(AimdRateControlTest, GetLastBitrateDecrease) { |
| 83 auto states = CreateAimdRateControlStates(); |
| 84 constexpr int kBitrate = 300000; |
| 85 InitBitrate(states, kBitrate, states.simulated_clock->TimeInMilliseconds()); |
| 86 UpdateRateControl(states, kBwOverusing, kBitrate - 2000, |
| 87 states.simulated_clock->TimeInMilliseconds()); |
| 88 EXPECT_EQ(rtc::Optional<int>(46700), |
| 89 states.aimd_rate_control->GetLastBitrateDecreaseBps()); |
| 90 } |
| 91 |
| 92 } // namespace webrtc |
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