1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* 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 = {webrtc::ScalabilityMode::kL1T3,
webrtc::ScalabilityMode::kL1T3,
webrtc::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
|
