Change TWCC send interval to reduce overhead on low BW situations.

webrtc/base/ratetracker.cc

 /*
  *  Copyright 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 75 matching lines @@
   for (size_t i = NextBucketIndex(start_bucket);
       i != NextBucketIndex(current_bucket_);
       i = NextBucketIndex(i)) {
     total_samples += sample_buckets_[i];
   }
   // Convert to samples per second.
   return static_cast<double>(total_samples * 1000) /
          static_cast<double>(available_interval_milliseconds);
 }
 
+double RateTracker::ComputeRate() const {
+  return ComputeRateForInterval(bucket_milliseconds_ *
+                                static_cast<int64_t>(bucket_count_));
+}
+
 double RateTracker::ComputeTotalRate() const {
   if (bucket_start_time_milliseconds_ == kTimeUnset) {
     return 0.0;
   }
   int64_t current_time = Time();
   if (current_time <= initialization_time_milliseconds_) {
     return 0.0;
   }
   return static_cast<double>(total_sample_count_ * 1000) /
          static_cast<double>(
@@ skipping 39 matching lines @@
     // current_bucket_ increments.
     sample_buckets_[current_bucket_] = 0;
   }
 }
 
 size_t RateTracker::NextBucketIndex(size_t bucket_index) const {
   return (bucket_index + 1u) % (bucket_count_ + 1u);
 }
 
 }  // namespace rtc