Make the BWE threshold adaptive.

webrtc/modules/pacing/paced_sender.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 157 matching lines @@
 };
 
 class IntervalBudget {
  public:
   explicit IntervalBudget(int initial_target_rate_kbps)
       : target_rate_kbps_(initial_target_rate_kbps),
         bytes_remaining_(0) {}
 
   void set_target_rate_kbps(int target_rate_kbps) {
     target_rate_kbps_ = target_rate_kbps;
+    bytes_remaining_ = std::max(-500 * target_rate_kbps_ / 8, bytes_remaining_);

[pbos-webrtc, 2015/07/06 10:01:40]

Named constants please.

[stefan-webrtc, 2015/07/06 10:54:25]

Done.

   }
 
   void IncreaseBudget(int64_t delta_time_ms) {
     int64_t bytes = target_rate_kbps_ * delta_time_ms / 8;
     if (bytes_remaining_ < 0) {
       // We overused last interval, compensate this interval.
       bytes_remaining_ = bytes_remaining_ + bytes;
     } else {
       // If we underused last interval we can't use it this interval.
       bytes_remaining_ = bytes;
@@ skipping 214 matching lines @@
 void PacedSender::UpdateBytesPerInterval(int64_t delta_time_ms) {
   media_budget_->IncreaseBudget(delta_time_ms);
   padding_budget_->IncreaseBudget(delta_time_ms);
 }
 
 bool PacedSender::ProbingExperimentIsEnabled() const {
   return webrtc::field_trial::FindFullName("WebRTC-BitrateProbing") ==
          "Enabled";
 }
 }  // namespace webrtc