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| 1 /* |
| 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 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 |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #include "webrtc/modules/congestion_controller/probing_interval_estimator.h" |
| 12 |
| 13 #include <algorithm> |
| 14 #include <utility> |
| 15 |
| 16 namespace webrtc { |
| 17 |
| 18 namespace { |
| 19 constexpr int kMinIntervalMs = 2000; |
| 20 constexpr int kMaxIntervalMs = 50000; |
| 21 } |
| 22 |
| 23 ProbingIntervalEstimator::ProbingIntervalEstimator( |
| 24 const AimdRateControl* aimd_rate_control) |
| 25 : ProbingIntervalEstimator(kMinIntervalMs, |
| 26 kMaxIntervalMs, |
| 27 aimd_rate_control) {} |
| 28 |
| 29 ProbingIntervalEstimator::ProbingIntervalEstimator( |
| 30 int min_interval_ms, |
| 31 int max_interval_ms, |
| 32 const AimdRateControl* aimd_rate_control) |
| 33 : min_interval_ms_(min_interval_ms), |
| 34 max_interval_ms_(max_interval_ms), |
| 35 aimd_rate_control_(aimd_rate_control) {} |
| 36 |
| 37 rtc::Optional<int> ProbingIntervalEstimator::GetIntervalMs() const { |
| 38 rtc::Optional<int> bitrate_drop = |
| 39 aimd_rate_control_->GetLastBitrateDecreaseBps(); |
| 40 int increase_rate = aimd_rate_control_->GetNearMaxIncreaseRateBps(); |
| 41 |
| 42 if (!bitrate_drop || increase_rate <= 0) |
| 43 return rtc::Optional<int>(); |
| 44 |
| 45 return rtc::Optional<int>(std::min( |
| 46 max_interval_ms_, |
| 47 std::max(1000 * (*bitrate_drop) / increase_rate, min_interval_ms_))); |
| 48 } |
| 49 |
| 50 } // namespace webrtc |
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