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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 */ |
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26 const int kStartingCongestionWindow = 6000; | 26 const int kStartingCongestionWindow = 6000; |
27 // Size of congestion window while in PROBE_RTT mode, suggested by BBR's source | 27 // Size of congestion window while in PROBE_RTT mode, suggested by BBR's source |
28 // code of QUIC's implementation. | 28 // code of QUIC's implementation. |
29 const int kMinimumCongestionWindow = 5840; | 29 const int kMinimumCongestionWindow = 5840; |
30 } // namespace | 30 } // namespace |
31 | 31 |
32 CongestionWindow::CongestionWindow() : data_inflight_bytes_(0) {} | 32 CongestionWindow::CongestionWindow() : data_inflight_bytes_(0) {} |
33 | 33 |
34 CongestionWindow::~CongestionWindow() {} | 34 CongestionWindow::~CongestionWindow() {} |
35 | 35 |
36 int CongestionWindow::GetCongestionWindow( | 36 int CongestionWindow::GetCongestionWindow(BbrBweSender::Mode mode, |
37 BbrBweSender::Mode mode, | 37 int64_t bandwidth_estimate_bps, |
38 int64_t bandwidth_estimate_bytes_per_ms, | 38 rtc::Optional<int64_t> min_rtt_ms, |
39 int64_t min_rtt_ms, | 39 float gain) { |
40 float gain) { | |
41 if (mode == BbrBweSender::PROBE_RTT) | 40 if (mode == BbrBweSender::PROBE_RTT) |
42 return kMinimumCongestionWindow; | 41 return kMinimumCongestionWindow; |
43 return GetTargetCongestionWindow(bandwidth_estimate_bytes_per_ms, min_rtt_ms, | 42 return GetTargetCongestionWindow(bandwidth_estimate_bps, min_rtt_ms, gain); |
44 gain); | |
45 } | 43 } |
46 | 44 |
47 void CongestionWindow::PacketSent(size_t sent_packet_size_bytes) { | 45 void CongestionWindow::PacketSent(size_t sent_packet_size_bytes) { |
48 data_inflight_bytes_ += sent_packet_size_bytes; | 46 data_inflight_bytes_ += sent_packet_size_bytes; |
49 } | 47 } |
50 | 48 |
51 void CongestionWindow::AckReceived(size_t received_packet_size_bytes) { | 49 void CongestionWindow::AckReceived(size_t received_packet_size_bytes) { |
52 data_inflight_bytes_ -= received_packet_size_bytes; | 50 data_inflight_bytes_ -= received_packet_size_bytes; |
53 } | 51 } |
54 | 52 |
55 int CongestionWindow::GetTargetCongestionWindow( | 53 int CongestionWindow::GetTargetCongestionWindow( |
56 int64_t bandwidth_estimate_bytes_per_ms, | 54 int64_t bandwidth_estimate_bps, |
57 int64_t min_rtt_ms, | 55 rtc::Optional<int64_t> min_rtt_ms, |
58 float gain) { | 56 float gain) { |
59 int bdp = min_rtt_ms * bandwidth_estimate_bytes_per_ms; | 57 int bdp = *min_rtt_ms * bandwidth_estimate_bps; |
60 int congestion_window = bdp * gain; | 58 int congestion_window = bdp * gain; |
61 // 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 |
62 // estimate is available, or path's min_rtt value is zero. | 60 // estimate is available, or path's min_rtt value is zero. |
63 if (!congestion_window) | 61 if (!congestion_window) |
64 congestion_window = gain * kStartingCongestionWindow; | 62 congestion_window = gain * kStartingCongestionWindow; |
65 return std::max(congestion_window, kMinimumCongestionWindow); | 63 return std::max(congestion_window, kMinimumCongestionWindow); |
66 } | 64 } |
67 } // namespace bwe | 65 } // namespace bwe |
68 } // namespace testing | 66 } // namespace testing |
69 } // namespace webrtc | 67 } // namespace webrtc |
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