Add task queue to Call.

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 36 matching lines @@
 
 BitrateAllocator::BitrateAllocator(LimitObserver* limit_observer)
     : limit_observer_(limit_observer),
       bitrate_observer_configs_(),
       last_bitrate_bps_(kDefaultBitrateBps),
       last_non_zero_bitrate_bps_(kDefaultBitrateBps),
       last_fraction_loss_(0),
       last_rtt_(0),
       num_pause_events_(0),
       clock_(Clock::GetRealTimeClock()),
-      last_bwe_log_time_(0) {}
+      last_bwe_log_time_(0) {
+  sequenced_checker_.Detach();
+}
 
 BitrateAllocator::~BitrateAllocator() {
   RTC_LOGGED_HISTOGRAM_COUNTS_100("WebRTC.Call.NumberOfPauseEvents",
                                   num_pause_events_);
 }
 
 void BitrateAllocator::OnNetworkChanged(uint32_t target_bitrate_bps,
                                         uint8_t fraction_loss,
                                         int64_t rtt) {
-  rtc::CritScope lock(&crit_sect_);
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   last_bitrate_bps_ = target_bitrate_bps;
   last_non_zero_bitrate_bps_ =
       target_bitrate_bps > 0 ? target_bitrate_bps : last_non_zero_bitrate_bps_;
   last_fraction_loss_ = fraction_loss;
   last_rtt_ = rtt;
 
   // Periodically log the incoming BWE.
   int64_t now = clock_->TimeInMilliseconds();
   if (now > last_bwe_log_time_ + kBweLogIntervalMs) {
     LOG(LS_INFO) << "Current BWE " << target_bitrate_bps;
@@ skipping 32 matching lines @@
       config.media_ratio = MediaRatio(allocated_bitrate, protection_bitrate);
     config.allocated_bitrate_bps = allocated_bitrate;
   }
 }
 
 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) {
-  rtc::CritScope lock(&crit_sect_);
+  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(
@@ skipping 17 matching lines @@
     // Currently, an encoder is not allowed to produce frames.
     // But we still have to return the initial config bitrate + let the
     // observer know that it can not produce frames.
     allocation = AllocateBitrates(last_non_zero_bitrate_bps_);
     observer->OnBitrateUpdated(0, last_fraction_loss_, last_rtt_);
   }
   UpdateAllocationLimits();
 }
 
 void BitrateAllocator::UpdateAllocationLimits() {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   uint32_t total_requested_padding_bitrate = 0;
   uint32_t total_requested_min_bitrate = 0;
 
-  {
-    rtc::CritScope lock(&crit_sect_);
-    for (const auto& config : bitrate_observer_configs_) {
-      if (config.enforce_min_bitrate) {
-        total_requested_min_bitrate += config.min_bitrate_bps;
-      }
-      total_requested_padding_bitrate += config.pad_up_bitrate_bps;
+  for (const auto& config : bitrate_observer_configs_) {
+    if (config.enforce_min_bitrate) {
+      total_requested_min_bitrate += config.min_bitrate_bps;
     }
+    total_requested_padding_bitrate += config.pad_up_bitrate_bps;
   }
 
   LOG(LS_INFO) << "UpdateAllocationLimits : total_requested_min_bitrate: "
                << total_requested_min_bitrate
                << "bps, total_requested_padding_bitrate: "
                << total_requested_padding_bitrate << "bps";
   limit_observer_->OnAllocationLimitsChanged(total_requested_min_bitrate,
                                              total_requested_padding_bitrate);
 }
 
 void BitrateAllocator::RemoveObserver(BitrateAllocatorObserver* observer) {
-  {
-    rtc::CritScope lock(&crit_sect_);
-    auto it = FindObserverConfig(observer);
-    if (it != bitrate_observer_configs_.end()) {
-      bitrate_observer_configs_.erase(it);
-    }
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
+  auto it = FindObserverConfig(observer);
+  if (it != bitrate_observer_configs_.end()) {
+    bitrate_observer_configs_.erase(it);
   }
+
   UpdateAllocationLimits();
 }
 
 int BitrateAllocator::GetStartBitrate(BitrateAllocatorObserver* observer) {
-  rtc::CritScope lock(&crit_sect_);
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   const auto& it = FindObserverConfig(observer);
   if (it == bitrate_observer_configs_.end()) {
     // This observer hasn't been added yet, just give it its fair share.
     return last_non_zero_bitrate_bps_ /
-             static_cast<int>((bitrate_observer_configs_.size() + 1));
+           static_cast<int>((bitrate_observer_configs_.size() + 1));
   } else if (it->allocated_bitrate_bps == -1) {
     // This observer hasn't received an allocation yet, so do the same.
     return last_non_zero_bitrate_bps_ /
-             static_cast<int>(bitrate_observer_configs_.size());
+           static_cast<int>(bitrate_observer_configs_.size());
   } else {
     // This observer already has an allocation.
     return it->allocated_bitrate_bps;
   }
 }
 
 BitrateAllocator::ObserverConfigs::iterator
-BitrateAllocator::FindObserverConfig(
-    const BitrateAllocatorObserver* observer) {
+BitrateAllocator::FindObserverConfig(const BitrateAllocatorObserver* observer) {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   for (auto it = bitrate_observer_configs_.begin();
        it != bitrate_observer_configs_.end(); ++it) {
     if (it->observer == observer)
       return it;
   }
   return bitrate_observer_configs_.end();
 }
 
 BitrateAllocator::ObserverAllocation BitrateAllocator::AllocateBitrates(
     uint32_t bitrate) {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   if (bitrate_observer_configs_.empty())
     return ObserverAllocation();
 
   if (bitrate == 0)
     return ZeroRateAllocation();
 
   uint32_t sum_min_bitrates = 0;
   uint32_t sum_max_bitrates = 0;
   for (const auto& observer_config : bitrate_observer_configs_) {
     sum_min_bitrates += observer_config.min_bitrate_bps;
     sum_max_bitrates += observer_config.max_bitrate_bps;
   }
 
   // Not enough for all observers to get an allocation, allocate according to:
   // enforced min bitrate -> allocated bitrate previous round -> restart paused
   // streams.
   if (!EnoughBitrateForAllObservers(bitrate, sum_min_bitrates))
     return LowRateAllocation(bitrate);
 
   // All observers will get their min bitrate plus an even share of the rest.
   if (bitrate <= sum_max_bitrates)
     return NormalRateAllocation(bitrate, sum_min_bitrates);
 
   // All observers will get up to kTransmissionMaxBitrateMultiplier x max.
   return MaxRateAllocation(bitrate, sum_max_bitrates);
 }
 
 BitrateAllocator::ObserverAllocation BitrateAllocator::ZeroRateAllocation() {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   ObserverAllocation allocation;
   for (const auto& observer_config : bitrate_observer_configs_)
     allocation[observer_config.observer] = 0;
   return allocation;
 }
 
 BitrateAllocator::ObserverAllocation BitrateAllocator::LowRateAllocation(
     uint32_t bitrate) {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   ObserverAllocation allocation;
-
   // Start by allocating bitrate to observers enforcing a min bitrate, hence
   // remaining_bitrate might turn negative.
   int64_t remaining_bitrate = bitrate;
   for (const auto& observer_config : bitrate_observer_configs_) {
     int32_t allocated_bitrate = 0;
     if (observer_config.enforce_min_bitrate)
       allocated_bitrate = observer_config.min_bitrate_bps;
 
     allocation[observer_config.observer] = allocated_bitrate;
     remaining_bitrate -= allocated_bitrate;
@@ skipping 33 matching lines @@
   if (remaining_bitrate > 0)
     DistributeBitrateEvenly(remaining_bitrate, false, 1, &allocation);
 
   RTC_DCHECK_EQ(allocation.size(), bitrate_observer_configs_.size());
   return allocation;
 }
 
 BitrateAllocator::ObserverAllocation BitrateAllocator::NormalRateAllocation(
     uint32_t bitrate,
     uint32_t sum_min_bitrates) {
-
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   ObserverAllocation allocation;
   for (const auto& observer_config : bitrate_observer_configs_)
     allocation[observer_config.observer] = observer_config.min_bitrate_bps;
 
   bitrate -= sum_min_bitrates;
   if (bitrate > 0)
     DistributeBitrateEvenly(bitrate, true, 1, &allocation);
 
   return allocation;
 }
 
 BitrateAllocator::ObserverAllocation BitrateAllocator::MaxRateAllocation(
-    uint32_t bitrate, uint32_t sum_max_bitrates) {
+    uint32_t bitrate,
+    uint32_t sum_max_bitrates) {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   ObserverAllocation allocation;
 
   for (const auto& observer_config : bitrate_observer_configs_) {
     allocation[observer_config.observer] = observer_config.max_bitrate_bps;
     bitrate -= observer_config.max_bitrate_bps;
   }
   DistributeBitrateEvenly(bitrate, true, kTransmissionMaxBitrateMultiplier,
                           &allocation);
   return allocation;
 }
 
 uint32_t BitrateAllocator::LastAllocatedBitrate(
     const ObserverConfig& observer_config) {
-
   // Return the configured minimum bitrate for newly added observers, to avoid
   // requiring an extra high bitrate for the observer to get an allocated
   // bitrate.
-  return observer_config.allocated_bitrate_bps == -1 ?
-      observer_config.min_bitrate_bps : observer_config.allocated_bitrate_bps;
+  return observer_config.allocated_bitrate_bps == -1
+             ? observer_config.min_bitrate_bps
+             : observer_config.allocated_bitrate_bps;
 }
 
 uint32_t BitrateAllocator::MinBitrateWithHysteresis(
     const ObserverConfig& observer_config) {
   uint32_t min_bitrate = observer_config.min_bitrate_bps;
   if (LastAllocatedBitrate(observer_config) == 0) {
     min_bitrate += std::max(static_cast<uint32_t>(kToggleFactor * min_bitrate),
                             kMinToggleBitrateBps);
   }
   // Account for protection bitrate used by this observer in the previous
   // allocation.
   // Note: the ratio will only be updated when the stream is active, meaning a
   // paused stream won't get any ratio updates. This might lead to waiting a bit
   // longer than necessary if the network condition improves, but this is to
   // avoid too much toggling.
   if (observer_config.media_ratio > 0.0 && observer_config.media_ratio < 1.0)
     min_bitrate += min_bitrate * (1.0 - observer_config.media_ratio);
 
   return min_bitrate;
 }
 
 void BitrateAllocator::DistributeBitrateEvenly(uint32_t bitrate,
                                                bool include_zero_allocations,
                                                int max_multiplier,
                                                ObserverAllocation* allocation) {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   RTC_DCHECK_EQ(allocation->size(), bitrate_observer_configs_.size());
 
   ObserverSortingMap list_max_bitrates;
   for (const auto& observer_config : bitrate_observer_configs_) {
     if (include_zero_allocations ||
         allocation->at(observer_config.observer) != 0) {
       list_max_bitrates.insert(std::pair<uint32_t, const ObserverConfig*>(
           observer_config.max_bitrate_bps, &observer_config));
     }
   }
@@ skipping 12 matching lines @@
       total_allocation = max_multiplier * it->first;
     }
     // Finally, update the allocation for this observer.
     allocation->at(it->second->observer) = total_allocation;
     it = list_max_bitrates.erase(it);
   }
 }
 
 bool BitrateAllocator::EnoughBitrateForAllObservers(uint32_t bitrate,
                                                     uint32_t sum_min_bitrates) {
+  RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
   if (bitrate < sum_min_bitrates)
     return false;
 
-  uint32_t extra_bitrate_per_observer = (bitrate - sum_min_bitrates) /
+  uint32_t extra_bitrate_per_observer =
+      (bitrate - sum_min_bitrates) /
       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