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webrtc / src / 9b6cd191ef4a02bfb42eaef8d383e81842af630b / . / call / bitrate_allocator_unittest.cc
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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 "call/bitrate_allocator.h"
#include <algorithm>
#include <memory>
#include <vector>
#include "system_wrappers/include/clock.h"
#include "test/gmock.h"
#include "test/gtest.h"
using ::testing::_;
using ::testing::AllOf;
using ::testing::Field;
using ::testing::NiceMock;
namespace webrtc {
namespace {
auto AllocationLimitsEq(uint32_t min_allocatable_rate_bps,
uint32_t max_padding_rate_bps,
uint32_t max_allocatable_rate_bps) {
return AllOf(Field(&BitrateAllocationLimits::min_allocatable_rate,
DataRate::BitsPerSec(min_allocatable_rate_bps)),
Field(&BitrateAllocationLimits::max_allocatable_rate,
DataRate::BitsPerSec(max_allocatable_rate_bps)),
Field(&BitrateAllocationLimits::max_padding_rate,
DataRate::BitsPerSec(max_padding_rate_bps)));
}
auto AllocationLimitsEq(uint32_t min_allocatable_rate_bps,
uint32_t max_padding_rate_bps) {
return AllOf(Field(&BitrateAllocationLimits::min_allocatable_rate,
DataRate::BitsPerSec(min_allocatable_rate_bps)),
Field(&BitrateAllocationLimits::max_padding_rate,
DataRate::BitsPerSec(max_padding_rate_bps)));
}
class MockLimitObserver : public BitrateAllocator::LimitObserver {
public:
MOCK_METHOD(void,
OnAllocationLimitsChanged,
(BitrateAllocationLimits),
(override));
};
class TestBitrateObserver : public BitrateAllocatorObserver {
public:
TestBitrateObserver()
: last_bitrate_bps_(0),
last_fraction_loss_(0),
last_rtt_ms_(0),
last_probing_interval_ms_(0),
protection_ratio_(0.0) {}
void SetBitrateProtectionRatio(double protection_ratio) {
protection_ratio_ = protection_ratio;
}
uint32_t OnBitrateUpdated(BitrateAllocationUpdate update) override {
last_bitrate_bps_ = update.target_bitrate.bps();
last_fraction_loss_ =
rtc::dchecked_cast<uint8_t>(update.packet_loss_ratio * 256);
last_rtt_ms_ = update.round_trip_time.ms();
last_probing_interval_ms_ = update.bwe_period.ms();
return update.target_bitrate.bps() * protection_ratio_;
}
uint32_t last_bitrate_bps_;
uint8_t last_fraction_loss_;
int64_t last_rtt_ms_;
int last_probing_interval_ms_;
double protection_ratio_;
};
constexpr int64_t kDefaultProbingIntervalMs = 3000;
const double kDefaultBitratePriority = 1.0;
TargetTransferRate CreateTargetRateMessage(uint32_t target_bitrate_bps,
uint8_t fraction_loss,
int64_t rtt_ms,
int64_t bwe_period_ms) {
TargetTransferRate msg;
// The timestamp is just for log output, keeping it fixed just means fewer log
// messages in the test.
msg.at_time = Timestamp::Seconds(10000);
msg.target_rate = DataRate::BitsPerSec(target_bitrate_bps);
msg.stable_target_rate = msg.target_rate;
msg.network_estimate.bandwidth = msg.target_rate;
msg.network_estimate.loss_rate_ratio = fraction_loss / 255.0;
msg.network_estimate.round_trip_time = TimeDelta::Millis(rtt_ms);
msg.network_estimate.bwe_period = TimeDelta::Millis(bwe_period_ms);
return msg;
}
} // namespace
class BitrateAllocatorTest : public ::testing::Test {
protected:
BitrateAllocatorTest() : allocator_(new BitrateAllocator(&limit_observer_)) {
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000u, 0, 0, kDefaultProbingIntervalMs));
}
~BitrateAllocatorTest() {}
void AddObserver(BitrateAllocatorObserver* observer,
uint32_t min_bitrate_bps,
uint32_t max_bitrate_bps,
uint32_t pad_up_bitrate_bps,
bool enforce_min_bitrate,
double bitrate_priority) {
allocator_->AddObserver(
observer,
{min_bitrate_bps, max_bitrate_bps, pad_up_bitrate_bps,
/* priority_bitrate */ 0, enforce_min_bitrate, bitrate_priority});
}
MediaStreamAllocationConfig DefaultConfig() const {
MediaStreamAllocationConfig default_config;
default_config.min_bitrate_bps = 0;
default_config.max_bitrate_bps = 1500000;
default_config.pad_up_bitrate_bps = 0;
default_config.priority_bitrate_bps = 0;
default_config.enforce_min_bitrate = true;
default_config.bitrate_priority = kDefaultBitratePriority;
return default_config;
}
NiceMock<MockLimitObserver> limit_observer_;
std::unique_ptr<BitrateAllocator> allocator_;
};
TEST_F(BitrateAllocatorTest, RespectsPriorityBitrate) {
TestBitrateObserver stream_a;
auto config_a = DefaultConfig();
config_a.min_bitrate_bps = 100000;
config_a.priority_bitrate_bps = 0;
allocator_->AddObserver(&stream_a, config_a);
TestBitrateObserver stream_b;
auto config_b = DefaultConfig();
config_b.min_bitrate_bps = 100000;
config_b.max_bitrate_bps = 300000;
config_b.priority_bitrate_bps = 300000;
allocator_->AddObserver(&stream_b, config_b);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(100000, 0, 0, 0));
EXPECT_EQ(stream_a.last_bitrate_bps_, 100000u);
EXPECT_EQ(stream_b.last_bitrate_bps_, 100000u);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(200000, 0, 0, 0));
EXPECT_EQ(stream_a.last_bitrate_bps_, 100000u);
EXPECT_EQ(stream_b.last_bitrate_bps_, 100000u);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 0, 0));
EXPECT_EQ(stream_a.last_bitrate_bps_, 100000u);
EXPECT_EQ(stream_b.last_bitrate_bps_, 200000u);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(400000, 0, 0, 0));
EXPECT_EQ(stream_a.last_bitrate_bps_, 100000u);
EXPECT_EQ(stream_b.last_bitrate_bps_, 300000u);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(800000, 0, 0, 0));
EXPECT_EQ(stream_a.last_bitrate_bps_, 500000u);
EXPECT_EQ(stream_b.last_bitrate_bps_, 300000u);
}
TEST_F(BitrateAllocatorTest, UpdatingBitrateObserver) {
TestBitrateObserver bitrate_observer;
const uint32_t kMinSendBitrateBps = 100000;
const uint32_t kPadUpToBitrateBps = 50000;
const uint32_t kMaxBitrateBps = 1500000;
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(
kMinSendBitrateBps, kPadUpToBitrateBps, kMaxBitrateBps)));
AddObserver(&bitrate_observer, kMinSendBitrateBps, kMaxBitrateBps,
kPadUpToBitrateBps, true, kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer));
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(200000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(200000, allocator_->GetStartBitrate(&bitrate_observer));
// TODO(pbos): Expect capping to 1.5M instead of 3M when not boosting the max
// bitrate for FEC/retransmissions (see todo in BitrateAllocator).
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(4000000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(3000000, allocator_->GetStartBitrate(&bitrate_observer));
// Expect `max_padding_bitrate_bps` to change to 0 if the observer is updated.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(
AllocationLimitsEq(kMinSendBitrateBps, 0)));
AddObserver(&bitrate_observer, kMinSendBitrateBps, 4000000, 0, true,
kDefaultBitratePriority);
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(
AllocationLimitsEq(kMinSendBitrateBps, 0)));
EXPECT_EQ(4000000, allocator_->GetStartBitrate(&bitrate_observer));
AddObserver(&bitrate_observer, kMinSendBitrateBps, kMaxBitrateBps, 0, true,
kDefaultBitratePriority);
EXPECT_EQ(3000000, allocator_->GetStartBitrate(&bitrate_observer));
EXPECT_EQ(3000000u, bitrate_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(kMaxBitrateBps, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(1500000u, bitrate_observer.last_bitrate_bps_);
}
TEST_F(BitrateAllocatorTest, TwoBitrateObserversOneRtcpObserver) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;
const uint32_t kObs1StartBitrateBps = 100000;
const uint32_t kObs2StartBitrateBps = 200000;
const uint32_t kObs1MaxBitrateBps = 300000;
const uint32_t kObs2MaxBitrateBps = 300000;
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(
kObs1StartBitrateBps, 0, kObs1MaxBitrateBps)));
AddObserver(&bitrate_observer_1, kObs1StartBitrateBps, kObs1MaxBitrateBps, 0,
true, kDefaultBitratePriority);
EXPECT_EQ(static_cast<int>(kObs1MaxBitrateBps),
allocator_->GetStartBitrate(&bitrate_observer_1));
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(
kObs1StartBitrateBps + kObs2StartBitrateBps, 0,
kObs1MaxBitrateBps + kObs2MaxBitrateBps)));
AddObserver(&bitrate_observer_2, kObs2StartBitrateBps, kObs2MaxBitrateBps, 0,
true, kDefaultBitratePriority);
EXPECT_EQ(static_cast<int>(kObs2StartBitrateBps),
allocator_->GetStartBitrate(&bitrate_observer_2));
// Test too low start bitrate, hence lower than sum of min. Min bitrates
// will
// be allocated to all observers.
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kObs2StartBitrateBps, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0, bitrate_observer_1.last_fraction_loss_);
EXPECT_EQ(50, bitrate_observer_1.last_rtt_ms_);
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_bps_);
EXPECT_EQ(0, bitrate_observer_2.last_fraction_loss_);
EXPECT_EQ(50, bitrate_observer_2.last_rtt_ms_);
// Test a bitrate which should be distributed equally.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(500000, 0, 50, kDefaultProbingIntervalMs));
const uint32_t kBitrateToShare =
500000 - kObs2StartBitrateBps - kObs1StartBitrateBps;
EXPECT_EQ(100000u + kBitrateToShare / 2,
bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(200000u + kBitrateToShare / 2,
bitrate_observer_2.last_bitrate_bps_);
// Limited by 2x max bitrates since we leave room for FEC and
// retransmissions.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(1500000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(600000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(600000u, bitrate_observer_2.last_bitrate_bps_);
// Verify that if the bandwidth estimate is set to zero, the allocated
// rate is
// zero.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(0, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
}
TEST_F(BitrateAllocatorTest, RemoveObserverTriggersLimitObserver) {
TestBitrateObserver bitrate_observer;
const uint32_t kMinSendBitrateBps = 100000;
const uint32_t kPadUpToBitrateBps = 50000;
const uint32_t kMaxBitrateBps = 1500000;
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(
kMinSendBitrateBps, kPadUpToBitrateBps, kMaxBitrateBps)));
AddObserver(&bitrate_observer, kMinSendBitrateBps, kMaxBitrateBps,
kPadUpToBitrateBps, true, kDefaultBitratePriority);
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(0, 0)));
allocator_->RemoveObserver(&bitrate_observer);
}
class BitrateAllocatorTestNoEnforceMin : public ::testing::Test {
protected:
BitrateAllocatorTestNoEnforceMin()
: allocator_(new BitrateAllocator(&limit_observer_)) {
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000u, 0, 0, kDefaultProbingIntervalMs));
}
~BitrateAllocatorTestNoEnforceMin() {}
void AddObserver(BitrateAllocatorObserver* observer,
uint32_t min_bitrate_bps,
uint32_t max_bitrate_bps,
uint32_t pad_up_bitrate_bps,
bool enforce_min_bitrate,
std::string track_id,
double bitrate_priority) {
allocator_->AddObserver(
observer, {min_bitrate_bps, max_bitrate_bps, pad_up_bitrate_bps, 0,
enforce_min_bitrate, bitrate_priority});
}
NiceMock<MockLimitObserver> limit_observer_;
std::unique_ptr<BitrateAllocator> allocator_;
};
// The following three tests verify enforcing a minimum bitrate works as
// intended.
TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserver) {
TestBitrateObserver bitrate_observer_1;
// Expect OnAllocationLimitsChanged with `min_send_bitrate_bps` = 0 since
// AddObserver is called with `enforce_min_bitrate` = false.
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(0, 0)));
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(0, 120000)));
AddObserver(&bitrate_observer_1, 100000, 400000, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer_1));
// High BWE.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(150000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(150000u, bitrate_observer_1.last_bitrate_bps_);
// Low BWE.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(10000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(0, 0)));
allocator_->RemoveObserver(&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.
AddObserver(&bitrate_observer_1, 100000, 400000, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer_1));
AddObserver(&bitrate_observer_2, 200000, 400000, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(200000, allocator_->GetStartBitrate(&bitrate_observer_2));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
AddObserver(&bitrate_observer_3, 300000, 400000, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(0, allocator_->GetStartBitrate(&bitrate_observer_3));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_bps_);
// High BWE. Make sure the controllers get a fair share of the surplus (i.e.,
// what is left after each controller gets its min rate).
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(690000, 0, 0, kDefaultProbingIntervalMs));
// 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_bps_);
EXPECT_EQ(200000u + bitrate_to_share / 3,
bitrate_observer_2.last_bitrate_bps_);
EXPECT_EQ(300000u + bitrate_to_share / 3,
bitrate_observer_3.last_bitrate_bps_);
// BWE below the sum of observer's min bitrate.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_); // Min bitrate.
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_bps_); // Min bitrate.
EXPECT_EQ(0u, bitrate_observer_3.last_bitrate_bps_); // Nothing.
// Increased BWE, but still below the sum of configured min bitrates for all
// observers and too little for observer 3. 1 and 2 will share the rest.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(500000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(200000u, bitrate_observer_1.last_bitrate_bps_); // Min + split.
EXPECT_EQ(300000u, bitrate_observer_2.last_bitrate_bps_); // Min + split.
EXPECT_EQ(0u, bitrate_observer_3.last_bitrate_bps_); // Nothing.
// Below min for all.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(10000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_3.last_bitrate_bps_);
// Verify that zero estimated bandwidth, means that that all gets zero,
// regardless of set min bitrate.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(0, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_3.last_bitrate_bps_);
allocator_->RemoveObserver(&bitrate_observer_1);
allocator_->RemoveObserver(&bitrate_observer_2);
allocator_->RemoveObserver(&bitrate_observer_3);
}
TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserverWithPacketLoss) {
const uint32_t kMinBitrateBps = 100000;
const uint32_t kMaxBitrateBps = 400000;
// Hysteresis adds another 10% or 20kbps to min bitrate.
const uint32_t kMinStartBitrateBps =
kMinBitrateBps + std::max(20000u, kMinBitrateBps / 10);
// Expect OnAllocationLimitsChanged with `min_send_bitrate_bps` = 0 since
// AddObserver is called with `enforce_min_bitrate` = false.
TestBitrateObserver bitrate_observer;
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(
AllocationLimitsEq(0, 0, kMaxBitrateBps)));
AddObserver(&bitrate_observer, kMinBitrateBps, kMaxBitrateBps, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer));
// High BWE.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(150000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(150000u, bitrate_observer.last_bitrate_bps_);
// Add loss and use a part of the bitrate for protection.
const double kProtectionRatio = 0.4;
const uint8_t fraction_loss = kProtectionRatio * 256;
bitrate_observer.SetBitrateProtectionRatio(kProtectionRatio);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
200000, 0, fraction_loss, kDefaultProbingIntervalMs));
EXPECT_EQ(200000u, bitrate_observer.last_bitrate_bps_);
// Above the min threshold, but not enough given the protection used.
// Limits changed, as we will video is now off and we need to pad up to the
// start bitrate.
// Verify the hysteresis is added for the protection.
const uint32_t kMinStartBitrateWithProtectionBps =
static_cast<uint32_t>(kMinStartBitrateBps * (1 + kProtectionRatio));
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(
0, kMinStartBitrateWithProtectionBps, kMaxBitrateBps)));
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kMinStartBitrateBps + 1000, 0, fraction_loss, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(kMinStartBitrateWithProtectionBps - 1000, 0,
fraction_loss, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer.last_bitrate_bps_);
// Just enough to enable video again.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(
AllocationLimitsEq(0, 0, kMaxBitrateBps)));
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(kMinStartBitrateWithProtectionBps, 0,
fraction_loss, kDefaultProbingIntervalMs));
EXPECT_EQ(kMinStartBitrateWithProtectionBps,
bitrate_observer.last_bitrate_bps_);
// Remove all protection and make sure video is not paused as earlier.
bitrate_observer.SetBitrateProtectionRatio(0.0);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(kMinStartBitrateWithProtectionBps - 1000, 0, 0,
kDefaultProbingIntervalMs));
EXPECT_EQ(kMinStartBitrateWithProtectionBps - 1000,
bitrate_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kMinStartBitrateBps, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(kMinStartBitrateBps, bitrate_observer.last_bitrate_bps_);
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(0, 0, 0)));
allocator_->RemoveObserver(&bitrate_observer);
}
TEST_F(BitrateAllocatorTest,
TotalAllocationLimitsAreUnaffectedByProtectionRatio) {
TestBitrateObserver bitrate_observer;
const uint32_t kMinBitrateBps = 100000;
const uint32_t kMaxBitrateBps = 400000;
// Register `bitrate_observer` and expect total allocation limits to change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(AllocationLimitsEq(
kMinBitrateBps, 0, kMaxBitrateBps)))
.Times(1);
MediaStreamAllocationConfig allocation_config = DefaultConfig();
allocation_config.min_bitrate_bps = kMinBitrateBps;
allocation_config.max_bitrate_bps = kMaxBitrateBps;
allocator_->AddObserver(&bitrate_observer, allocation_config);
// Observer uses 20% of it's allocated bitrate for protection.
bitrate_observer.SetBitrateProtectionRatio(/*protection_ratio=*/0.2);
// Total allocation limits are unaffected by the protection rate change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(_)).Times(0);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(200000u, 0, 100, kDefaultProbingIntervalMs));
// Observer uses 0% of it's allocated bitrate for protection.
bitrate_observer.SetBitrateProtectionRatio(/*protection_ratio=*/0.0);
// Total allocation limits are unaffected by the protection rate change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(_)).Times(0);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(200000u, 0, 100, kDefaultProbingIntervalMs));
// Observer again uses 20% of it's allocated bitrate for protection.
bitrate_observer.SetBitrateProtectionRatio(/*protection_ratio=*/0.2);
// Total allocation limits are unaffected by the protection rate change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(_)).Times(0);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(200000u, 0, 100, kDefaultProbingIntervalMs));
}
TEST_F(BitrateAllocatorTestNoEnforceMin, TwoBitrateObserverWithPacketLoss) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;
AddObserver(&bitrate_observer_1, 100000, 400000, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer_1));
AddObserver(&bitrate_observer_2, 200000, 400000, 0, false, "",
kDefaultBitratePriority);
EXPECT_EQ(200000, allocator_->GetStartBitrate(&bitrate_observer_2));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
// Enough bitrate for both.
bitrate_observer_2.SetBitrateProtectionRatio(0.5);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_bps_);
// Above min for observer 2, but too little given the protection used.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(330000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(330000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(100000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(99999, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(119000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(120000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(120000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
// Verify the protection is accounted for before resuming observer 2.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(429000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(400000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(430000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(330000u, bitrate_observer_2.last_bitrate_bps_);
allocator_->RemoveObserver(&bitrate_observer_1);
allocator_->RemoveObserver(&bitrate_observer_2);
}
TEST_F(BitrateAllocatorTest, ThreeBitrateObserversLowBweEnforceMin) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;
TestBitrateObserver bitrate_observer_3;
AddObserver(&bitrate_observer_1, 100000, 400000, 0, true,
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer_1));
AddObserver(&bitrate_observer_2, 200000, 400000, 0, true,
kDefaultBitratePriority);
EXPECT_EQ(200000, allocator_->GetStartBitrate(&bitrate_observer_2));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_);
AddObserver(&bitrate_observer_3, 300000, 400000, 0, true,
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer_3));
EXPECT_EQ(100000, static_cast<int>(bitrate_observer_1.last_bitrate_bps_));
EXPECT_EQ(200000, static_cast<int>(bitrate_observer_2.last_bitrate_bps_));
// Low BWE. Verify that all observers still get their respective min
// bitrate.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(1000, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(100000u, bitrate_observer_1.last_bitrate_bps_); // Min cap.
EXPECT_EQ(200000u, bitrate_observer_2.last_bitrate_bps_); // Min cap.
EXPECT_EQ(300000u, bitrate_observer_3.last_bitrate_bps_); // Min cap.
allocator_->RemoveObserver(&bitrate_observer_1);
allocator_->RemoveObserver(&bitrate_observer_2);
allocator_->RemoveObserver(&bitrate_observer_3);
}
TEST_F(BitrateAllocatorTest, AddObserverWhileNetworkDown) {
TestBitrateObserver bitrate_observer_1;
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(50000, 0)));
AddObserver(&bitrate_observer_1, 50000, 400000, 0, true,
kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&bitrate_observer_1));
// Set network down, ie, no available bitrate.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(0, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
TestBitrateObserver bitrate_observer_2;
// Adding an observer while the network is down should not affect the limits.
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(AllocationLimitsEq(50000 + 50000, 0)));
AddObserver(&bitrate_observer_2, 50000, 400000, 0, true,
kDefaultBitratePriority);
// Expect the start_bitrate to be set as if the network was still up but that
// the new observer have been notified that the network is down.
EXPECT_EQ(300000 / 2, allocator_->GetStartBitrate(&bitrate_observer_2));
EXPECT_EQ(0u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(0u, bitrate_observer_2.last_bitrate_bps_);
// Set network back up.
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(1500000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(750000u, bitrate_observer_1.last_bitrate_bps_);
EXPECT_EQ(750000u, bitrate_observer_2.last_bitrate_bps_);
}
TEST_F(BitrateAllocatorTest, MixedEnforecedConfigs) {
TestBitrateObserver enforced_observer;
AddObserver(&enforced_observer, 6000, 30000, 0, true,
kDefaultBitratePriority);
EXPECT_EQ(60000, allocator_->GetStartBitrate(&enforced_observer));
TestBitrateObserver not_enforced_observer;
AddObserver(&not_enforced_observer, 30000, 2500000, 0, false,
kDefaultBitratePriority);
EXPECT_EQ(270000, allocator_->GetStartBitrate(&not_enforced_observer));
EXPECT_EQ(30000u, enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(36000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(6000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(30000u, not_enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(35000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(30000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(0u, not_enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(5000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(6000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(0u, not_enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(36000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(30000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(0u, not_enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(55000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(30000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(0u, not_enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(56000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(6000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(50000u, not_enforced_observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(56000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(16000u, enforced_observer.last_bitrate_bps_);
EXPECT_EQ(40000u, not_enforced_observer.last_bitrate_bps_);
allocator_->RemoveObserver(&enforced_observer);
allocator_->RemoveObserver(&not_enforced_observer);
}
TEST_F(BitrateAllocatorTest, AvoidToggleAbsolute) {
TestBitrateObserver observer;
AddObserver(&observer, 30000, 300000, 0, false, kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&observer));
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(30000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(30000u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(20000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(30000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(49000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(50000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(50000u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(30000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(30000u, observer.last_bitrate_bps_);
allocator_->RemoveObserver(&observer);
}
TEST_F(BitrateAllocatorTest, AvoidTogglePercent) {
TestBitrateObserver observer;
AddObserver(&observer, 300000, 600000, 0, false, kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&observer));
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(300000u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(200000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(329000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(0u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(330000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(330000u, observer.last_bitrate_bps_);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 50, kDefaultProbingIntervalMs));
EXPECT_EQ(300000u, observer.last_bitrate_bps_);
allocator_->RemoveObserver(&observer);
}
TEST_F(BitrateAllocatorTest, PassProbingInterval) {
TestBitrateObserver observer;
AddObserver(&observer, 300000, 600000, 0, false, kDefaultBitratePriority);
EXPECT_EQ(300000, allocator_->GetStartBitrate(&observer));
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(300000, 0, 50, 5000));
EXPECT_EQ(5000, observer.last_probing_interval_ms_);
allocator_->RemoveObserver(&observer);
}
TEST_F(BitrateAllocatorTest, PriorityRateOneObserverBasic) {
TestBitrateObserver observer;
const uint32_t kMinSendBitrateBps = 10;
const uint32_t kMaxSendBitrateBps = 60;
const uint32_t kNetworkBandwidthBps = 30;
AddObserver(&observer, kMinSendBitrateBps, kMaxSendBitrateBps, 0, true, 2.0);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kNetworkBandwidthBps, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(kNetworkBandwidthBps, observer.last_bitrate_bps_);
allocator_->RemoveObserver(&observer);
}
// Tests that two observers with the same bitrate priority are allocated
// their bitrate evenly.
TEST_F(BitrateAllocatorTest, PriorityRateTwoObserversBasic) {
TestBitrateObserver observer_low_1;
TestBitrateObserver observer_low_2;
const uint32_t kMinSendBitrateBps = 10;
const uint32_t kMaxSendBitrateBps = 60;
const uint32_t kNetworkBandwidthBps = 60;
AddObserver(&observer_low_1, kMinSendBitrateBps, kMaxSendBitrateBps, 0, false,
2.0);
AddObserver(&observer_low_2, kMinSendBitrateBps, kMaxSendBitrateBps, 0, false,
2.0);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kNetworkBandwidthBps, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(kNetworkBandwidthBps / 2, observer_low_1.last_bitrate_bps_);
EXPECT_EQ(kNetworkBandwidthBps / 2, observer_low_2.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low_1);
allocator_->RemoveObserver(&observer_low_2);
}
// Tests that there is no difference in functionality when the min bitrate is
// enforced.
TEST_F(BitrateAllocatorTest, PriorityRateTwoObserversBasicMinEnforced) {
TestBitrateObserver observer_low_1;
TestBitrateObserver observer_low_2;
const uint32_t kMinSendBitrateBps = 0;
const uint32_t kMaxSendBitrateBps = 60;
const uint32_t kNetworkBandwidthBps = 60;
AddObserver(&observer_low_1, kMinSendBitrateBps, kMaxSendBitrateBps, 0, true,
2.0);
AddObserver(&observer_low_2, kMinSendBitrateBps, kMaxSendBitrateBps, 0, true,
2.0);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kNetworkBandwidthBps, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(kNetworkBandwidthBps / 2, observer_low_1.last_bitrate_bps_);
EXPECT_EQ(kNetworkBandwidthBps / 2, observer_low_2.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low_1);
allocator_->RemoveObserver(&observer_low_2);
}
// Tests that if the available bandwidth is the sum of the max bitrate
// of all observers, they will be allocated their max.
TEST_F(BitrateAllocatorTest, PriorityRateTwoObserversBothAllocatedMax) {
TestBitrateObserver observer_low;
TestBitrateObserver observer_mid;
const uint32_t kMinSendBitrateBps = 0;
const uint32_t kMaxSendBitrateBps = 60;
const uint32_t kNetworkBandwidthBps = kMaxSendBitrateBps * 2;
AddObserver(&observer_low, kMinSendBitrateBps, kMaxSendBitrateBps, 0, true,
2.0);
AddObserver(&observer_mid, kMinSendBitrateBps, kMaxSendBitrateBps, 0, true,
4.0);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kNetworkBandwidthBps, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(kMaxSendBitrateBps, observer_low.last_bitrate_bps_);
EXPECT_EQ(kMaxSendBitrateBps, observer_mid.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low);
allocator_->RemoveObserver(&observer_mid);
}
// Tests that after a higher bitrate priority observer has been allocated its
// max bitrate the lower priority observer will then be allocated the remaining
// bitrate.
TEST_F(BitrateAllocatorTest, PriorityRateTwoObserversOneAllocatedToMax) {
TestBitrateObserver observer_low;
TestBitrateObserver observer_mid;
AddObserver(&observer_low, 10, 50, 0, false, 2.0);
AddObserver(&observer_mid, 10, 50, 0, false, 4.0);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(90, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(40u, observer_low.last_bitrate_bps_);
EXPECT_EQ(50u, observer_mid.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low);
allocator_->RemoveObserver(&observer_mid);
}
// Tests that three observers with three different bitrate priorities will all
// be allocated bitrate according to their relative bitrate priority.
TEST_F(BitrateAllocatorTest,
PriorityRateThreeObserversAllocatedRelativeAmounts) {
TestBitrateObserver observer_low;
TestBitrateObserver observer_mid;
TestBitrateObserver observer_high;
const uint32_t kMaxBitrate = 100;
// Not enough bandwidth to fill any observer's max bitrate.
const uint32_t kNetworkBandwidthBps = 70;
const double kLowBitratePriority = 2.0;
const double kMidBitratePriority = 4.0;
const double kHighBitratePriority = 8.0;
const double kTotalBitratePriority =
kLowBitratePriority + kMidBitratePriority + kHighBitratePriority;
AddObserver(&observer_low, 0, kMaxBitrate, 0, false, kLowBitratePriority);
AddObserver(&observer_mid, 0, kMaxBitrate, 0, false, kMidBitratePriority);
AddObserver(&observer_high, 0, kMaxBitrate, 0, false, kHighBitratePriority);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kNetworkBandwidthBps, 0, 0, kDefaultProbingIntervalMs));
const double kLowFractionAllocated =
kLowBitratePriority / kTotalBitratePriority;
const double kMidFractionAllocated =
kMidBitratePriority / kTotalBitratePriority;
const double kHighFractionAllocated =
kHighBitratePriority / kTotalBitratePriority;
EXPECT_EQ(kLowFractionAllocated * kNetworkBandwidthBps,
observer_low.last_bitrate_bps_);
EXPECT_EQ(kMidFractionAllocated * kNetworkBandwidthBps,
observer_mid.last_bitrate_bps_);
EXPECT_EQ(kHighFractionAllocated * kNetworkBandwidthBps,
observer_high.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low);
allocator_->RemoveObserver(&observer_mid);
allocator_->RemoveObserver(&observer_high);
}
// Tests that after the high priority observer has been allocated its maximum
// bitrate, the other two observers are still allocated bitrate according to
// their relative bitrate priority.
TEST_F(BitrateAllocatorTest, PriorityRateThreeObserversHighAllocatedToMax) {
TestBitrateObserver observer_low;
const double kLowBitratePriority = 2.0;
TestBitrateObserver observer_mid;
const double kMidBitratePriority = 4.0;
TestBitrateObserver observer_high;
const double kHighBitratePriority = 8.0;
const uint32_t kAvailableBitrate = 90;
const uint32_t kMaxBitrate = 40;
const uint32_t kMinBitrate = 10;
// Remaining bitrate after allocating to all mins and knowing that the high
// priority observer will have its max bitrate allocated.
const uint32_t kRemainingBitrate =
kAvailableBitrate - kMaxBitrate - (2 * kMinBitrate);
AddObserver(&observer_low, kMinBitrate, kMaxBitrate, 0, false,
kLowBitratePriority);
AddObserver(&observer_mid, kMinBitrate, kMaxBitrate, 0, false,
kMidBitratePriority);
AddObserver(&observer_high, kMinBitrate, kMaxBitrate, 0, false,
kHighBitratePriority);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kAvailableBitrate, 0, 0, kDefaultProbingIntervalMs));
const double kLowFractionAllocated =
kLowBitratePriority / (kLowBitratePriority + kMidBitratePriority);
const double kMidFractionAllocated =
kMidBitratePriority / (kLowBitratePriority + kMidBitratePriority);
EXPECT_EQ(kMinBitrate + (kRemainingBitrate * kLowFractionAllocated),
observer_low.last_bitrate_bps_);
EXPECT_EQ(kMinBitrate + (kRemainingBitrate * kMidFractionAllocated),
observer_mid.last_bitrate_bps_);
EXPECT_EQ(40u, observer_high.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low);
allocator_->RemoveObserver(&observer_mid);
allocator_->RemoveObserver(&observer_high);
}
// Tests that after the low priority observer has been allocated its maximum
// bitrate, the other two observers are still allocated bitrate according to
// their relative bitrate priority.
TEST_F(BitrateAllocatorTest, PriorityRateThreeObserversLowAllocatedToMax) {
TestBitrateObserver observer_low;
const double kLowBitratePriority = 2.0;
const uint32_t kLowMaxBitrate = 10;
TestBitrateObserver observer_mid;
const double kMidBitratePriority = 4.0;
TestBitrateObserver observer_high;
const double kHighBitratePriority = 8.0;
const uint32_t kMinBitrate = 0;
const uint32_t kMaxBitrate = 60;
const uint32_t kAvailableBitrate = 100;
// Remaining bitrate knowing that the low priority observer is allocated its
// max bitrate. We know this because it is allocated 2.0/14.0 (1/7) of the
// available bitrate, so 70 bps would be sufficient network bandwidth.
const uint32_t kRemainingBitrate = kAvailableBitrate - kLowMaxBitrate;
AddObserver(&observer_low, kMinBitrate, kLowMaxBitrate, 0, false,
kLowBitratePriority);
AddObserver(&observer_mid, kMinBitrate, kMaxBitrate, 0, false,
kMidBitratePriority);
AddObserver(&observer_high, kMinBitrate, kMaxBitrate, 0, false,
kHighBitratePriority);
allocator_->OnNetworkEstimateChanged(CreateTargetRateMessage(
kAvailableBitrate, 0, 0, kDefaultProbingIntervalMs));
const double kMidFractionAllocated =
kMidBitratePriority / (kMidBitratePriority + kHighBitratePriority);
const double kHighFractionAllocated =
kHighBitratePriority / (kMidBitratePriority + kHighBitratePriority);
EXPECT_EQ(kLowMaxBitrate, observer_low.last_bitrate_bps_);
EXPECT_EQ(kMinBitrate + (kRemainingBitrate * kMidFractionAllocated),
observer_mid.last_bitrate_bps_);
EXPECT_EQ(kMinBitrate + (kRemainingBitrate * kHighFractionAllocated),
observer_high.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low);
allocator_->RemoveObserver(&observer_mid);
allocator_->RemoveObserver(&observer_high);
}
// Tests that after two observers are allocated bitrate to their max, the
// the remaining observer is allocated what's left appropriately. This test
// handles an edge case where the medium and high observer reach their
// "relative" max allocation at the same time. The high has 40 to allocate
// above its min, and the mid has 20 to allocate above its min, which scaled
// by their bitrate priority is the same for each.
TEST_F(BitrateAllocatorTest, PriorityRateThreeObserversTwoAllocatedToMax) {
TestBitrateObserver observer_low;
TestBitrateObserver observer_mid;
TestBitrateObserver observer_high;
AddObserver(&observer_low, 10, 40, 0, false, 2.0);
// Scaled allocation above the min allocation is the same for these two,
// meaning they will get allocated their max at the same time.
// Scaled (target allocation) = (max - min) / bitrate priority
AddObserver(&observer_mid, 10, 30, 0, false, 4.0);
AddObserver(&observer_high, 10, 50, 0, false, 8.0);
allocator_->OnNetworkEstimateChanged(
CreateTargetRateMessage(110, 0, 0, kDefaultProbingIntervalMs));
EXPECT_EQ(30u, observer_low.last_bitrate_bps_);
EXPECT_EQ(30u, observer_mid.last_bitrate_bps_);
EXPECT_EQ(50u, observer_high.last_bitrate_bps_);
allocator_->RemoveObserver(&observer_low);
allocator_->RemoveObserver(&observer_mid);
allocator_->RemoveObserver(&observer_high);
}
} // namespace webrtc