Media track ID visibility at BWE level

webrtc/call/bitrate_allocator.cc

 /*
  *  Copyright (c) 2015 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 106 matching lines @@
       config.media_ratio = MediaRatio(allocated_bitrate, protection_bitrate);
     config.allocated_bitrate_bps = allocated_bitrate;
   }
   UpdateAllocationLimits();
 }
 
 void BitrateAllocator::AddObserver(BitrateAllocatorObserver* observer,
                                    uint32_t min_bitrate_bps,
                                    uint32_t max_bitrate_bps,
                                    uint32_t pad_up_bitrate_bps,
-                                   bool enforce_min_bitrate) {
+                                   bool enforce_min_bitrate,
+                                   std::string track_id) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   auto it = FindObserverConfig(observer);
 
   // Update settings if the observer already exists, create a new one otherwise.
   if (it != bitrate_observer_configs_.end()) {
     it->min_bitrate_bps = min_bitrate_bps;
     it->max_bitrate_bps = max_bitrate_bps;
     it->pad_up_bitrate_bps = pad_up_bitrate_bps;
     it->enforce_min_bitrate = enforce_min_bitrate;
   } else {
     bitrate_observer_configs_.push_back(
         ObserverConfig(observer, min_bitrate_bps, max_bitrate_bps,
-                       pad_up_bitrate_bps, enforce_min_bitrate));
+                       pad_up_bitrate_bps, enforce_min_bitrate, track_id));
   }
 
   ObserverAllocation allocation;
   if (last_bitrate_bps_ > 0) {
     // Calculate a new allocation and update all observers.
     allocation = AllocateBitrates(last_bitrate_bps_);
     for (auto& config : bitrate_observer_configs_) {
       uint32_t allocated_bitrate = allocation[config.observer];
       uint32_t protection_bitrate = config.observer->OnBitrateUpdated(
           allocated_bitrate, last_fraction_loss_, last_rtt_,
@@ skipping 280 matching lines @@
       static_cast<uint32_t>(bitrate_observer_configs_.size());
   for (const auto& observer_config : bitrate_observer_configs_) {
     if (observer_config.min_bitrate_bps + extra_bitrate_per_observer <
         MinBitrateWithHysteresis(observer_config)) {
       return false;
     }
   }
   return true;
 }
 }  // namespace webrtc