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1 /* | 1 /* |
2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 * | 9 * |
10 */ | 10 */ |
11 | 11 |
12 #include "webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_win
dow.h" | 12 #include "webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_win
dow.h" |
13 | 13 |
14 #include <algorithm> | 14 #include <algorithm> |
15 | 15 |
16 #include "webrtc/modules/remote_bitrate_estimator/test/estimators/bbr.h" | 16 #include "webrtc/modules/remote_bitrate_estimator/test/estimators/bbr.h" |
17 | 17 |
18 namespace webrtc { | 18 namespace webrtc { |
19 namespace testing { | 19 namespace testing { |
20 namespace bwe { | 20 namespace bwe { |
21 namespace { | 21 namespace { |
22 // kStartingCongestionWindowBytes is used to set congestion window when | 22 // kStartingCongestionWindowBytes is used to set congestion window when |
23 // bandwidth delay product is equal to zero, so that we don't set window to zero | 23 // bandwidth delay product is equal to zero, so that we don't set window to zero |
24 // as well. Chosen randomly by me, because this value shouldn't make any | 24 // as well. Chosen randomly by me, because this value shouldn't make any |
25 // significant difference, as bandwidth delay product is more than zero almost | 25 // significant difference, as bandwidth delay product is more than zero almost |
26 // every time. | 26 // every time. |
27 const int kStartingCongestionWindowBytes = 6000; | 27 const int kStartingCongestionWindowBytes = 6000; |
28 } // namespace | 28 } // namespace |
29 | 29 |
30 const int CongestionWindow::kMinimumCongestionWindowBytes; | |
31 | |
32 CongestionWindow::CongestionWindow() : data_inflight_bytes_(0) {} | 30 CongestionWindow::CongestionWindow() : data_inflight_bytes_(0) {} |
33 | 31 |
34 CongestionWindow::~CongestionWindow() {} | 32 CongestionWindow::~CongestionWindow() {} |
35 | 33 |
36 int CongestionWindow::GetCongestionWindow(BbrBweSender::Mode mode, | 34 int CongestionWindow::GetCongestionWindow(BbrBweSender::Mode mode, |
37 int64_t bandwidth_estimate_bps, | 35 int64_t bandwidth_estimate_bps, |
38 rtc::Optional<int64_t> min_rtt_ms, | 36 rtc::Optional<int64_t> min_rtt_ms, |
39 float gain) { | 37 float gain) { |
40 if (mode == BbrBweSender::PROBE_RTT) | |
41 return CongestionWindow::kMinimumCongestionWindowBytes; | |
42 return GetTargetCongestionWindow(bandwidth_estimate_bps, min_rtt_ms, gain); | 38 return GetTargetCongestionWindow(bandwidth_estimate_bps, min_rtt_ms, gain); |
43 } | 39 } |
44 | 40 |
45 void CongestionWindow::PacketSent(size_t sent_packet_size_bytes) { | 41 void CongestionWindow::PacketSent(size_t sent_packet_size_bytes) { |
46 data_inflight_bytes_ += sent_packet_size_bytes; | 42 data_inflight_bytes_ += sent_packet_size_bytes; |
47 } | 43 } |
48 | 44 |
49 void CongestionWindow::AckReceived(size_t received_packet_size_bytes) { | 45 void CongestionWindow::AckReceived(size_t received_packet_size_bytes) { |
| 46 RTC_DCHECK_GE(data_inflight_bytes_ >= received_packet_size_bytes, true); |
50 data_inflight_bytes_ -= received_packet_size_bytes; | 47 data_inflight_bytes_ -= received_packet_size_bytes; |
51 } | 48 } |
52 | 49 |
53 int CongestionWindow::GetTargetCongestionWindow( | 50 int CongestionWindow::GetTargetCongestionWindow( |
54 int64_t bandwidth_estimate_bps, | 51 int64_t bandwidth_estimate_bps, |
55 rtc::Optional<int64_t> min_rtt_ms, | 52 rtc::Optional<int64_t> min_rtt_ms, |
56 float gain) { | 53 float gain) { |
57 // If we have no rtt sample yet, return the starting congestion window size. | 54 // If we have no rtt sample yet, return the starting congestion window size. |
58 if (!min_rtt_ms) | 55 if (!min_rtt_ms) |
59 return gain * kStartingCongestionWindowBytes; | 56 return gain * kStartingCongestionWindowBytes; |
60 int bdp = *min_rtt_ms * bandwidth_estimate_bps; | 57 int bdp = *min_rtt_ms * bandwidth_estimate_bps / 8000; |
61 int congestion_window = bdp * gain; | 58 int congestion_window = bdp * gain; |
62 // Congestion window could be zero in rare cases, when either no bandwidth | 59 // Congestion window could be zero in rare cases, when either no bandwidth |
63 // estimate is available, or path's min_rtt value is zero. | 60 // estimate is available, or path's min_rtt value is zero. |
64 if (!congestion_window) | 61 if (!congestion_window) |
65 congestion_window = gain * kStartingCongestionWindowBytes; | 62 congestion_window = gain * kStartingCongestionWindowBytes; |
66 return std::max(congestion_window, | 63 return congestion_window; |
67 CongestionWindow::kMinimumCongestionWindowBytes); | |
68 } | 64 } |
69 } // namespace bwe | 65 } // namespace bwe |
70 } // namespace testing | 66 } // namespace testing |
71 } // namespace webrtc | 67 } // namespace webrtc |
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