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1 /* | 1 /* |
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2014 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 #include "webrtc/modules/pacing/bitrate_prober.h" | 11 #include "webrtc/modules/pacing/bitrate_prober.h" |
12 | 12 |
13 #include <algorithm> | 13 #include <algorithm> |
14 | 14 |
15 #include "webrtc/base/checks.h" | 15 #include "webrtc/base/checks.h" |
16 #include "webrtc/base/logging.h" | 16 #include "webrtc/base/logging.h" |
17 #include "webrtc/logging/rtc_event_log/rtc_event_log.h" | |
18 #include "webrtc/modules/pacing/paced_sender.h" | 17 #include "webrtc/modules/pacing/paced_sender.h" |
19 | 18 |
20 namespace webrtc { | 19 namespace webrtc { |
21 | 20 |
22 namespace { | 21 namespace { |
23 | 22 |
24 // A minimum interval between probes to allow scheduling to be feasible. | 23 // A minimum interval between probes to allow scheduling to be feasible. |
25 constexpr int kMinProbeDeltaMs = 1; | 24 constexpr int kMinProbeDeltaMs = 1; |
26 | 25 |
27 // The minimum number probing packets used. | 26 // The minimum number probing packets used. |
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39 | 38 |
40 // The min probe packet size is scaled with the bitrate we're probing at. | 39 // The min probe packet size is scaled with the bitrate we're probing at. |
41 // This defines the max min probe packet size, meaning that on high bitrates | 40 // This defines the max min probe packet size, meaning that on high bitrates |
42 // we have a min probe packet size of 200 bytes. | 41 // we have a min probe packet size of 200 bytes. |
43 constexpr size_t kMinProbePacketSize = 200; | 42 constexpr size_t kMinProbePacketSize = 200; |
44 | 43 |
45 constexpr int64_t kProbeClusterTimeoutMs = 5000; | 44 constexpr int64_t kProbeClusterTimeoutMs = 5000; |
46 | 45 |
47 } // namespace | 46 } // namespace |
48 | 47 |
49 BitrateProber::BitrateProber() : BitrateProber(nullptr) {} | 48 BitrateProber::BitrateProber() |
50 | |
51 BitrateProber::BitrateProber(RtcEventLog* event_log) | |
52 : probing_state_(ProbingState::kDisabled), | 49 : probing_state_(ProbingState::kDisabled), |
53 next_probe_time_ms_(-1), | 50 next_probe_time_ms_(-1), |
54 next_cluster_id_(0), | 51 next_cluster_id_(0) { |
55 event_log_(event_log) { | |
56 SetEnabled(true); | 52 SetEnabled(true); |
57 } | 53 } |
58 | 54 |
59 void BitrateProber::SetEnabled(bool enable) { | 55 void BitrateProber::SetEnabled(bool enable) { |
60 if (enable) { | 56 if (enable) { |
61 if (probing_state_ == ProbingState::kDisabled) { | 57 if (probing_state_ == ProbingState::kDisabled) { |
62 probing_state_ = ProbingState::kInactive; | 58 probing_state_ = ProbingState::kInactive; |
63 LOG(LS_INFO) << "Bandwidth probing enabled, set to inactive"; | 59 LOG(LS_INFO) << "Bandwidth probing enabled, set to inactive"; |
64 } | 60 } |
65 } else { | 61 } else { |
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92 } | 88 } |
93 | 89 |
94 ProbeCluster cluster; | 90 ProbeCluster cluster; |
95 cluster.time_created_ms = now_ms; | 91 cluster.time_created_ms = now_ms; |
96 cluster.pace_info.probe_cluster_min_probes = kMinProbePacketsSent; | 92 cluster.pace_info.probe_cluster_min_probes = kMinProbePacketsSent; |
97 cluster.pace_info.probe_cluster_min_bytes = | 93 cluster.pace_info.probe_cluster_min_bytes = |
98 bitrate_bps * kMinProbeDurationMs / 8000; | 94 bitrate_bps * kMinProbeDurationMs / 8000; |
99 cluster.pace_info.send_bitrate_bps = bitrate_bps; | 95 cluster.pace_info.send_bitrate_bps = bitrate_bps; |
100 cluster.pace_info.probe_cluster_id = next_cluster_id_++; | 96 cluster.pace_info.probe_cluster_id = next_cluster_id_++; |
101 clusters_.push(cluster); | 97 clusters_.push(cluster); |
102 if (event_log_) | |
103 event_log_->LogProbeClusterCreated( | |
104 cluster.pace_info.probe_cluster_id, cluster.pace_info.send_bitrate_bps, | |
105 cluster.pace_info.probe_cluster_min_probes, | |
106 cluster.pace_info.probe_cluster_min_bytes); | |
107 | 98 |
108 LOG(LS_INFO) << "Probe cluster (bitrate:min bytes:min packets): (" | 99 LOG(LS_INFO) << "Probe cluster (bitrate:min bytes:min packets): (" |
109 << cluster.pace_info.send_bitrate_bps << ":" | 100 << cluster.pace_info.send_bitrate_bps << ":" |
110 << cluster.pace_info.probe_cluster_min_bytes << ":" | 101 << cluster.pace_info.probe_cluster_min_bytes << ":" |
111 << cluster.pace_info.probe_cluster_min_probes << ")"; | 102 << cluster.pace_info.probe_cluster_min_probes << ")"; |
112 // If we are already probing, continue to do so. Otherwise set it to | 103 // If we are already probing, continue to do so. Otherwise set it to |
113 // kInactive and wait for OnIncomingPacket to start the probing. | 104 // kInactive and wait for OnIncomingPacket to start the probing. |
114 if (probing_state_ != ProbingState::kActive) | 105 if (probing_state_ != ProbingState::kActive) |
115 probing_state_ = ProbingState::kInactive; | 106 probing_state_ = ProbingState::kInactive; |
116 } | 107 } |
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193 // Compute the time delta from the cluster start to ensure probe bitrate stays | 184 // Compute the time delta from the cluster start to ensure probe bitrate stays |
194 // close to the target bitrate. Result is in milliseconds. | 185 // close to the target bitrate. Result is in milliseconds. |
195 int64_t delta_ms = | 186 int64_t delta_ms = |
196 (8000ll * cluster.sent_bytes + cluster.pace_info.send_bitrate_bps / 2) / | 187 (8000ll * cluster.sent_bytes + cluster.pace_info.send_bitrate_bps / 2) / |
197 cluster.pace_info.send_bitrate_bps; | 188 cluster.pace_info.send_bitrate_bps; |
198 return cluster.time_started_ms + delta_ms; | 189 return cluster.time_started_ms + delta_ms; |
199 } | 190 } |
200 | 191 |
201 | 192 |
202 } // namespace webrtc | 193 } // namespace webrtc |
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