| /* |
| * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "webrtc/modules/pacing/interval_budget.h" |
| |
| #include <algorithm> |
| |
| namespace webrtc { |
| namespace { |
| constexpr int kWindowMs = 500; |
| constexpr int kDeltaTimeMs = 2000; |
| } |
| |
| IntervalBudget::IntervalBudget(int initial_target_rate_kbps) |
| : IntervalBudget(initial_target_rate_kbps, false) {} |
| |
| IntervalBudget::IntervalBudget(int initial_target_rate_kbps, |
| bool can_build_up_underuse) |
| : bytes_remaining_(0), can_build_up_underuse_(can_build_up_underuse) { |
| set_target_rate_kbps(initial_target_rate_kbps); |
| } |
| |
| void IntervalBudget::set_target_rate_kbps(int target_rate_kbps) { |
| target_rate_kbps_ = target_rate_kbps; |
| max_bytes_in_budget_ = (kWindowMs * target_rate_kbps_) / 8; |
| bytes_remaining_ = std::min(std::max(-max_bytes_in_budget_, bytes_remaining_), |
| max_bytes_in_budget_); |
| } |
| |
| void IntervalBudget::IncreaseBudget(int64_t delta_time_ms) { |
| RTC_DCHECK_LT(delta_time_ms, kDeltaTimeMs); |
| int bytes = target_rate_kbps_ * delta_time_ms / 8; |
| if (bytes_remaining_ < 0 || can_build_up_underuse_) { |
| // We overused last interval, compensate this interval. |
| bytes_remaining_ = std::min(bytes_remaining_ + bytes, max_bytes_in_budget_); |
| } else { |
| // If we underused last interval we can't use it this interval. |
| bytes_remaining_ = std::min(bytes, max_bytes_in_budget_); |
| } |
| } |
| |
| void IntervalBudget::UseBudget(size_t bytes) { |
| bytes_remaining_ = std::max(bytes_remaining_ - static_cast<int>(bytes), |
| -max_bytes_in_budget_); |
| } |
| |
| size_t IntervalBudget::bytes_remaining() const { |
| return static_cast<size_t>(std::max(0, bytes_remaining_)); |
| } |
| |
| int IntervalBudget::budget_level_percent() const { |
| return bytes_remaining_ * 100 / max_bytes_in_budget_; |
| } |
| |
| int IntervalBudget::target_rate_kbps() const { |
| return target_rate_kbps_; |
| } |
| |
| } // namespace webrtc |