diff options
Diffstat (limited to 'third_party/libwebrtc/modules/pacing/interval_budget.cc')
-rw-r--r-- | third_party/libwebrtc/modules/pacing/interval_budget.cc | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/pacing/interval_budget.cc b/third_party/libwebrtc/modules/pacing/interval_budget.cc new file mode 100644 index 0000000000..321ca46be4 --- /dev/null +++ b/third_party/libwebrtc/modules/pacing/interval_budget.cc @@ -0,0 +1,68 @@ +/* + * 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 "modules/pacing/interval_budget.h" + +#include <algorithm> + +#include "rtc_base/numerics/safe_conversions.h" + +namespace webrtc { +namespace { +constexpr int64_t kWindowMs = 500; +} + +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) { + int64_t 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 rtc::saturated_cast<size_t>(std::max<int64_t>(0, bytes_remaining_)); +} + +double IntervalBudget::budget_ratio() const { + if (max_bytes_in_budget_ == 0) + return 0.0; + return static_cast<double>(bytes_remaining_) / max_bytes_in_budget_; +} + +int IntervalBudget::target_rate_kbps() const { + return target_rate_kbps_; +} + +} // namespace webrtc |