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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <algorithm>
#include <vector>
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/modules/bitrate_controller/include/bitrate_allocator.h"
#include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
namespace webrtc {
class TestBitrateObserver : public BitrateObserver {
public:
TestBitrateObserver()
: last_bitrate_(0), last_fraction_loss_(0), last_rtt_(0) {}
virtual void OnNetworkChanged(uint32_t bitrate,
uint8_t fraction_loss,
int64_t rtt) {
last_bitrate_ = bitrate;
last_fraction_loss_ = fraction_loss;
last_rtt_ = rtt;
}
uint32_t last_bitrate_;
uint8_t last_fraction_loss_;
int64_t last_rtt_;
};
class BitrateAllocatorTest : public ::testing::Test {
protected:
BitrateAllocatorTest() : allocator_(new BitrateAllocator()) {
allocator_->OnNetworkChanged(300000u, 0, 0);
}
~BitrateAllocatorTest() {}
rtc::scoped_ptr<BitrateAllocator> allocator_;
};
TEST_F(BitrateAllocatorTest, UpdatingBitrateObserver) {
TestBitrateObserver bitrate_observer;
int start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer, 100000, 1500000);
EXPECT_EQ(300000, start_bitrate);
allocator_->OnNetworkChanged(200000, 0, 0);
EXPECT_EQ(200000u, bitrate_observer.last_bitrate_);
// TODO(pbos): Expect capping to 1.5M instead of 3M when not boosting the max
// bitrate for FEC/retransmissions (see TODO in BitrateAllocator).
allocator_->OnNetworkChanged(4000000, 0, 0);
EXPECT_EQ(3000000u, bitrate_observer.last_bitrate_);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer, 100000, 4000000);
EXPECT_EQ(4000000, start_bitrate);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer, 100000, 1500000);
EXPECT_EQ(3000000, start_bitrate);
EXPECT_EQ(3000000u, bitrate_observer.last_bitrate_);
allocator_->OnNetworkChanged(1500000, 0, 0);
EXPECT_EQ(1500000u, bitrate_observer.last_bitrate_);
}
TEST_F(BitrateAllocatorTest, TwoBitrateObserversOneRtcpObserver) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;
int start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_1, 100000, 300000);
EXPECT_EQ(300000, start_bitrate);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_2, 200000, 300000);
EXPECT_EQ(200000, start_bitrate);
// Test too low start bitrate, hence lower than sum of min. Min bitrates will
// be allocated to all observers.
allocator_->OnNetworkChanged(200000, 0, 50);
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_);
EXPECT_EQ(0, bitrate_observer_1.last_fraction_loss_);
EXPECT_EQ(50, bitrate_observer_1.last_rtt_);
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_);
EXPECT_EQ(0, bitrate_observer_2.last_fraction_loss_);
EXPECT_EQ(50, bitrate_observer_2.last_rtt_);
// Test a bitrate which should be distributed equally.
allocator_->OnNetworkChanged(500000, 0, 50);
const uint32_t kBitrateToShare = 500000 - 200000 - 100000;
EXPECT_EQ(100000u + kBitrateToShare / 2, bitrate_observer_1.last_bitrate_);
EXPECT_EQ(200000u + kBitrateToShare / 2, bitrate_observer_2.last_bitrate_);
// Limited by 2x max bitrates since we leave room for FEC and retransmissions.
allocator_->OnNetworkChanged(1500000, 0, 50);
EXPECT_EQ(600000u, bitrate_observer_1.last_bitrate_);
EXPECT_EQ(600000u, bitrate_observer_2.last_bitrate_);
}
class BitrateAllocatorTestNoEnforceMin : public ::testing::Test {
protected:
BitrateAllocatorTestNoEnforceMin() : allocator_(new BitrateAllocator()) {
allocator_->EnforceMinBitrate(false);
allocator_->OnNetworkChanged(300000u, 0, 0);
}
~BitrateAllocatorTestNoEnforceMin() {}
rtc::scoped_ptr<BitrateAllocator> allocator_;
};
// The following three tests verify that the EnforceMinBitrate() method works
// as intended.
TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserver) {
TestBitrateObserver bitrate_observer_1;
int start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_1, 100000, 400000);
EXPECT_EQ(300000, start_bitrate);
// High REMB.
allocator_->OnNetworkChanged(150000, 0, 0);
EXPECT_EQ(150000u, bitrate_observer_1.last_bitrate_);
// Low REMB.
allocator_->OnNetworkChanged(10000, 0, 0);
EXPECT_EQ(10000u, bitrate_observer_1.last_bitrate_);
allocator_->RemoveBitrateObserver(&bitrate_observer_1);
}
TEST_F(BitrateAllocatorTestNoEnforceMin, ThreeBitrateObservers) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;
TestBitrateObserver bitrate_observer_3;
// Set up the observers with min bitrates at 100000, 200000, and 300000.
int start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_1, 100000, 400000);
EXPECT_EQ(300000, start_bitrate);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_2, 200000, 400000);
EXPECT_EQ(200000, start_bitrate);
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_3, 300000, 400000);
EXPECT_EQ(0, start_bitrate);
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_);
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_);
// High REMB. Make sure the controllers get a fair share of the surplus
// (i.e., what is left after each controller gets its min rate).
allocator_->OnNetworkChanged(690000, 0, 0);
// Verify that each observer gets its min rate (sum of min rates is 600000),
// and that the remaining 90000 is divided equally among the three.
uint32_t bitrate_to_share = 690000u - 100000u - 200000u - 300000u;
EXPECT_EQ(100000u + bitrate_to_share / 3, bitrate_observer_1.last_bitrate_);
EXPECT_EQ(200000u + bitrate_to_share / 3, bitrate_observer_2.last_bitrate_);
EXPECT_EQ(300000u + bitrate_to_share / 3, bitrate_observer_3.last_bitrate_);
// High REMB, but below the sum of min bitrates.
allocator_->OnNetworkChanged(500000, 0, 0);
// Verify that the first and second observers get their min bitrates, and the
// third gets the remainder.
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_); // Min bitrate.
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_); // Min bitrate.
EXPECT_EQ(200000u, bitrate_observer_3.last_bitrate_); // Remainder.
// Low REMB.
allocator_->OnNetworkChanged(10000, 0, 0);
// Verify that the first observer gets all the rate, and the rest get zero.
EXPECT_EQ(10000u, bitrate_observer_1.last_bitrate_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_);
EXPECT_EQ(0u, bitrate_observer_3.last_bitrate_);
allocator_->RemoveBitrateObserver(&bitrate_observer_1);
allocator_->RemoveBitrateObserver(&bitrate_observer_2);
allocator_->RemoveBitrateObserver(&bitrate_observer_3);
}
TEST_F(BitrateAllocatorTest, ThreeBitrateObserversLowRembEnforceMin) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;
TestBitrateObserver bitrate_observer_3;
int start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_1, 100000, 400000);
EXPECT_EQ(300000, start_bitrate);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_2, 200000, 400000);
EXPECT_EQ(200000, start_bitrate);
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_);
start_bitrate =
allocator_->AddBitrateObserver(&bitrate_observer_3, 300000, 400000);
EXPECT_EQ(300000, start_bitrate);
EXPECT_EQ(100000, static_cast<int>(bitrate_observer_1.last_bitrate_));
EXPECT_EQ(200000, static_cast<int>(bitrate_observer_2.last_bitrate_));
// Low REMB. Verify that all observers still get their respective min bitrate.
allocator_->OnNetworkChanged(1000, 0, 0);
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_); // Min cap.
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_); // Min cap.
EXPECT_EQ(300000u, bitrate_observer_3.last_bitrate_); // Min cap.
allocator_->RemoveBitrateObserver(&bitrate_observer_1);
allocator_->RemoveBitrateObserver(&bitrate_observer_2);
allocator_->RemoveBitrateObserver(&bitrate_observer_3);
}
} // namespace webrtc
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