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/*
* Copyright 2020 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 "test/gtest.h"
#include "test/scenario/scenario.h"
namespace webrtc {
namespace test {
TEST(ProbingTest, InitialProbingRampsUpTargetRateWhenNetworkIsGood) {
Scenario s;
NetworkSimulationConfig good_network;
good_network.bandwidth = DataRate::KilobitsPerSec(2000);
VideoStreamConfig video_config;
video_config.encoder.codec =
VideoStreamConfig::Encoder::Codec::kVideoCodecVP8;
CallClientConfig send_config;
auto* caller = s.CreateClient("caller", send_config);
auto* callee = s.CreateClient("callee", CallClientConfig());
auto route =
s.CreateRoutes(caller, {s.CreateSimulationNode(good_network)}, callee,
{s.CreateSimulationNode(NetworkSimulationConfig())});
s.CreateVideoStream(route->forward(), video_config);
s.RunFor(TimeDelta::Seconds(1));
EXPECT_GE(DataRate::BitsPerSec(caller->GetStats().send_bandwidth_bps),
3 * send_config.transport.rates.start_rate);
}
TEST(ProbingTest, MidCallProbingRampupTriggeredByUpdatedBitrateConstraints) {
Scenario s;
const DataRate kStartRate = DataRate::KilobitsPerSec(300);
const DataRate kConstrainedRate = DataRate::KilobitsPerSec(100);
const DataRate kHighRate = DataRate::KilobitsPerSec(1500);
VideoStreamConfig video_config;
video_config.encoder.codec =
VideoStreamConfig::Encoder::Codec::kVideoCodecVP8;
CallClientConfig send_call_config;
send_call_config.transport.rates.start_rate = kStartRate;
send_call_config.transport.rates.max_rate = kHighRate * 2;
auto* caller = s.CreateClient("caller", send_call_config);
auto* callee = s.CreateClient("callee", CallClientConfig());
auto route = s.CreateRoutes(
caller, {s.CreateSimulationNode(NetworkSimulationConfig())}, callee,
{s.CreateSimulationNode(NetworkSimulationConfig())});
s.CreateVideoStream(route->forward(), video_config);
// Wait until initial probing rampup is done and then set a low max bitrate.
s.RunFor(TimeDelta::Seconds(1));
EXPECT_GE(DataRate::BitsPerSec(caller->GetStats().send_bandwidth_bps),
5 * send_call_config.transport.rates.start_rate);
BitrateConstraints bitrate_config;
bitrate_config.max_bitrate_bps = kConstrainedRate.bps();
caller->UpdateBitrateConstraints(bitrate_config);
// Wait until the low send bitrate has taken effect, and then set a much
// higher max bitrate.
s.RunFor(TimeDelta::Seconds(2));
EXPECT_LT(DataRate::BitsPerSec(caller->GetStats().send_bandwidth_bps),
kConstrainedRate * 1.1);
bitrate_config.max_bitrate_bps = 2 * kHighRate.bps();
caller->UpdateBitrateConstraints(bitrate_config);
// Check that the max send bitrate is reached quicker than would be possible
// with simple AIMD rate control.
s.RunFor(TimeDelta::Seconds(1));
EXPECT_GE(DataRate::BitsPerSec(caller->GetStats().send_bandwidth_bps),
kHighRate);
}
TEST(ProbingTest, ProbesRampsUpWhenVideoEncoderConfigChanges) {
Scenario s;
const DataRate kStartRate = DataRate::KilobitsPerSec(50);
const DataRate kHdRate = DataRate::KilobitsPerSec(3250);
// Set up 3-layer simulcast.
VideoStreamConfig video_config;
video_config.encoder.codec =
VideoStreamConfig::Encoder::Codec::kVideoCodecVP8;
video_config.encoder.simulcast_streams = {
ScalabilityMode::kL1T3, ScalabilityMode::kL1T3, ScalabilityMode::kL1T3};
video_config.source.generator.width = 1280;
video_config.source.generator.height = 720;
CallClientConfig send_call_config;
send_call_config.transport.rates.start_rate = kStartRate;
send_call_config.transport.rates.max_rate = kHdRate * 2;
auto* caller = s.CreateClient("caller", send_call_config);
auto* callee = s.CreateClient("callee", CallClientConfig());
auto send_net =
s.CreateMutableSimulationNode([&](NetworkSimulationConfig* c) {
c->bandwidth = DataRate::KilobitsPerSec(200);
});
auto route =
s.CreateRoutes(caller, {send_net->node()}, callee,
{s.CreateSimulationNode(NetworkSimulationConfig())});
auto* video_stream = s.CreateVideoStream(route->forward(), video_config);
// Only QVGA enabled initially. Run until initial probing is done and BWE
// has settled.
video_stream->send()->UpdateActiveLayers({true, false, false});
s.RunFor(TimeDelta::Seconds(2));
// Remove network constraints and run for a while more, BWE should be much
// less than required HD rate.
send_net->UpdateConfig([&](NetworkSimulationConfig* c) {
c->bandwidth = DataRate::PlusInfinity();
});
s.RunFor(TimeDelta::Seconds(2));
DataRate bandwidth =
DataRate::BitsPerSec(caller->GetStats().send_bandwidth_bps);
EXPECT_LT(bandwidth, kHdRate / 4);
// Enable all layers, triggering a probe.
video_stream->send()->UpdateActiveLayers({true, true, true});
// Run for a short while and verify BWE has ramped up fast.
s.RunFor(TimeDelta::Seconds(2));
EXPECT_GT(DataRate::BitsPerSec(caller->GetStats().send_bandwidth_bps),
kHdRate);
}
} // namespace test
} // namespace webrtc
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