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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* Copyright (c) 2015 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 "webrtc/modules/remote_bitrate_estimator/test/estimators/remb.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/base/common.h"
#include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
#include "webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_abs_send_time.h"
#include "webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.h"
#include "webrtc/modules/rtp_rtcp/include/receive_statistics.h"
namespace webrtc {
namespace testing {
namespace bwe {
RembBweSender::RembBweSender(int kbps, BitrateObserver* observer, Clock* clock)
: bitrate_controller_(
BitrateController::CreateBitrateController(clock, observer)),
feedback_observer_(bitrate_controller_->CreateRtcpBandwidthObserver()),
clock_(clock) {
assert(kbps >= kMinBitrateKbps);
assert(kbps <= kMaxBitrateKbps);
bitrate_controller_->SetStartBitrate(1000 * kbps);
bitrate_controller_->SetMinMaxBitrate(1000 * kMinBitrateKbps,
1000 * kMaxBitrateKbps);
}
RembBweSender::~RembBweSender() {
}
void RembBweSender::GiveFeedback(const FeedbackPacket& feedback) {
const RembFeedback& remb_feedback =
static_cast<const RembFeedback&>(feedback);
feedback_observer_->OnReceivedEstimatedBitrate(remb_feedback.estimated_bps());
ReportBlockList report_blocks;
report_blocks.push_back(remb_feedback.report_block());
feedback_observer_->OnReceivedRtcpReceiverReport(
report_blocks, 0, clock_->TimeInMilliseconds());
bitrate_controller_->Process();
}
int64_t RembBweSender::TimeUntilNextProcess() {
return bitrate_controller_->TimeUntilNextProcess();
}
int RembBweSender::Process() {
return bitrate_controller_->Process();
}
int RembBweSender::GetFeedbackIntervalMs() const {
return 100;
}
RembReceiver::RembReceiver(int flow_id, bool plot)
: BweReceiver(flow_id),
estimate_log_prefix_(),
plot_estimate_(plot),
clock_(0),
recv_stats_(ReceiveStatistics::Create(&clock_)),
latest_estimate_bps_(-1),
last_feedback_ms_(-1),
estimator_(new RemoteBitrateEstimatorAbsSendTime(this, &clock_)) {
std::stringstream ss;
ss << "Estimate_" << flow_id_ << "#1";
estimate_log_prefix_ = ss.str();
// Default RTT in RemoteRateControl is 200 ms ; 50 ms is more realistic.
estimator_->OnRttUpdate(50, 50);
estimator_->SetMinBitrate(kRemoteBitrateEstimatorMinBitrateBps);
}
RembReceiver::~RembReceiver() {
}
void RembReceiver::ReceivePacket(int64_t arrival_time_ms,
const MediaPacket& media_packet) {
recv_stats_->IncomingPacket(media_packet.header(),
media_packet.payload_size(), false);
latest_estimate_bps_ = -1;
int64_t step_ms = std::max<int64_t>(estimator_->TimeUntilNextProcess(), 0);
while ((clock_.TimeInMilliseconds() + step_ms) < arrival_time_ms) {
clock_.AdvanceTimeMilliseconds(step_ms);
estimator_->Process();
step_ms = std::max<int64_t>(estimator_->TimeUntilNextProcess(), 0);
}
estimator_->IncomingPacket(arrival_time_ms, media_packet.payload_size(),
media_packet.header(), true);
clock_.AdvanceTimeMilliseconds(arrival_time_ms - clock_.TimeInMilliseconds());
ASSERT_TRUE(arrival_time_ms == clock_.TimeInMilliseconds());
// Log received packet information.
BweReceiver::ReceivePacket(arrival_time_ms, media_packet);
}
FeedbackPacket* RembReceiver::GetFeedback(int64_t now_ms) {
BWE_TEST_LOGGING_CONTEXT("Remb");
uint32_t estimated_bps = 0;
RembFeedback* feedback = NULL;
if (LatestEstimate(&estimated_bps)) {
StatisticianMap statisticians = recv_stats_->GetActiveStatisticians();
RTCPReportBlock report_block;
if (!statisticians.empty()) {
report_block = BuildReportBlock(statisticians.begin()->second);
}
feedback = new RembFeedback(flow_id_, now_ms * 1000, last_feedback_ms_,
estimated_bps, report_block);
last_feedback_ms_ = now_ms;
double estimated_kbps = static_cast<double>(estimated_bps) / 1000.0;
RTC_UNUSED(estimated_kbps);
if (plot_estimate_) {
BWE_TEST_LOGGING_PLOT(0, estimate_log_prefix_,
clock_.TimeInMilliseconds(), estimated_kbps);
}
}
return feedback;
}
void RembReceiver::OnReceiveBitrateChanged(
const std::vector<unsigned int>& ssrcs,
unsigned int bitrate) {
}
RTCPReportBlock RembReceiver::BuildReportBlock(
StreamStatistician* statistician) {
RTCPReportBlock report_block;
RtcpStatistics stats;
if (!statistician->GetStatistics(&stats, true))
return report_block;
report_block.fractionLost = stats.fraction_lost;
report_block.cumulativeLost = stats.cumulative_lost;
report_block.extendedHighSeqNum = stats.extended_max_sequence_number;
report_block.jitter = stats.jitter;
return report_block;
}
bool RembReceiver::LatestEstimate(uint32_t* estimate_bps) {
if (latest_estimate_bps_ < 0) {
std::vector<unsigned int> ssrcs;
unsigned int bps = 0;
if (!estimator_->LatestEstimate(&ssrcs, &bps)) {
return false;
}
latest_estimate_bps_ = bps;
}
*estimate_bps = latest_estimate_bps_;
return true;
}
} // namespace bwe
} // namespace testing
} // namespace webrtc
|
