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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 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/interval_budget.h" | 11 #include "webrtc/modules/pacing/interval_budget.h" |
12 | 12 |
13 #include <algorithm> | 13 #include <algorithm> |
14 | 14 |
15 namespace webrtc { | 15 namespace webrtc { |
16 namespace { | 16 namespace { |
17 constexpr int kWindowMs = 500; | 17 constexpr int kWindowMs = 500; |
| 18 constexpr int kDeltaTimeMs = 2000; |
18 } | 19 } |
19 | 20 |
20 IntervalBudget::IntervalBudget(int initial_target_rate_kbps) | 21 IntervalBudget::IntervalBudget(int initial_target_rate_kbps) |
21 : IntervalBudget(initial_target_rate_kbps, false) {} | 22 : IntervalBudget(initial_target_rate_kbps, false) {} |
22 | 23 |
23 IntervalBudget::IntervalBudget(int initial_target_rate_kbps, | 24 IntervalBudget::IntervalBudget(int initial_target_rate_kbps, |
24 bool can_build_up_underuse) | 25 bool can_build_up_underuse) |
25 : bytes_remaining_(0), can_build_up_underuse_(can_build_up_underuse) { | 26 : bytes_remaining_(0), can_build_up_underuse_(can_build_up_underuse) { |
26 set_target_rate_kbps(initial_target_rate_kbps); | 27 set_target_rate_kbps(initial_target_rate_kbps); |
27 } | 28 } |
28 | 29 |
29 void IntervalBudget::set_target_rate_kbps(int target_rate_kbps) { | 30 void IntervalBudget::set_target_rate_kbps(int target_rate_kbps) { |
30 target_rate_kbps_ = target_rate_kbps; | 31 target_rate_kbps_ = target_rate_kbps; |
31 max_bytes_in_budget_ = (kWindowMs * target_rate_kbps_) / 8; | 32 max_bytes_in_budget_ = (kWindowMs * target_rate_kbps_) / 8; |
32 bytes_remaining_ = std::min(std::max(-max_bytes_in_budget_, bytes_remaining_), | 33 bytes_remaining_ = std::min(std::max(-max_bytes_in_budget_, bytes_remaining_), |
33 max_bytes_in_budget_); | 34 max_bytes_in_budget_); |
34 } | 35 } |
35 | 36 |
36 void IntervalBudget::IncreaseBudget(int64_t delta_time_ms) { | 37 void IntervalBudget::IncreaseBudget(int64_t delta_time_ms) { |
| 38 RTC_DCHECK_LT(delta_time_ms, kDeltaTimeMs); |
37 int bytes = target_rate_kbps_ * delta_time_ms / 8; | 39 int bytes = target_rate_kbps_ * delta_time_ms / 8; |
38 if (bytes_remaining_ < 0 || can_build_up_underuse_) { | 40 if (bytes_remaining_ < 0 || can_build_up_underuse_) { |
39 // We overused last interval, compensate this interval. | 41 // We overused last interval, compensate this interval. |
40 bytes_remaining_ = std::min(bytes_remaining_ + bytes, max_bytes_in_budget_); | 42 bytes_remaining_ = std::min(bytes_remaining_ + bytes, max_bytes_in_budget_); |
41 } else { | 43 } else { |
42 // If we underused last interval we can't use it this interval. | 44 // If we underused last interval we can't use it this interval. |
43 bytes_remaining_ = std::min(bytes, max_bytes_in_budget_); | 45 bytes_remaining_ = std::min(bytes, max_bytes_in_budget_); |
44 } | 46 } |
45 } | 47 } |
46 | 48 |
47 void IntervalBudget::UseBudget(size_t bytes) { | 49 void IntervalBudget::UseBudget(size_t bytes) { |
48 bytes_remaining_ = std::max(bytes_remaining_ - static_cast<int>(bytes), | 50 bytes_remaining_ = std::max(bytes_remaining_ - static_cast<int>(bytes), |
49 -max_bytes_in_budget_); | 51 -max_bytes_in_budget_); |
50 } | 52 } |
51 | 53 |
52 size_t IntervalBudget::bytes_remaining() const { | 54 size_t IntervalBudget::bytes_remaining() const { |
53 return static_cast<size_t>(std::max(0, bytes_remaining_)); | 55 return static_cast<size_t>(std::max(0, bytes_remaining_)); |
54 } | 56 } |
55 | 57 |
56 int IntervalBudget::budget_level_percent() const { | 58 int IntervalBudget::budget_level_percent() const { |
57 return bytes_remaining_ * 100 / max_bytes_in_budget_; | 59 return bytes_remaining_ * 100 / max_bytes_in_budget_; |
58 } | 60 } |
59 | 61 |
60 int IntervalBudget::target_rate_kbps() const { | 62 int IntervalBudget::target_rate_kbps() const { |
61 return target_rate_kbps_; | 63 return target_rate_kbps_; |
62 } | 64 } |
63 | 65 |
64 } // namespace webrtc | 66 } // namespace webrtc |
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