Fix for alr detection bug on pause.

webrtc/modules/pacing/interval_budget.cc

 /*
  *  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