Fix per regression in probing.

webrtc/modules/pacing/bitrate_prober.cc

 /*
  *  Copyright (c) 2014 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 123 matching lines @@
   RTC_DCHECK(!clusters_.empty());
   RTC_DCHECK(ProbingState::kActive == probing_state_);
   return clusters_.front().id;
 }
 
 // Probe size is recommended based on the probe bitrate required. We choose
 // a minimum of twice |kMinProbeDeltaMs| interval to allow scheduling to be
 // feasible.
 size_t BitrateProber::RecommendedMinProbeSize() const {
   RTC_DCHECK(!clusters_.empty());
-  return clusters_.front().bitrate_bps * 3 * kMinProbeDeltaMs / (8 * 1000);
+  return clusters_.front().bitrate_bps * 2 * kMinProbeDeltaMs / (8 * 1000);
 }
 
 void BitrateProber::ProbeSent(int64_t now_ms, size_t bytes) {
   RTC_DCHECK(probing_state_ == ProbingState::kActive);
   RTC_DCHECK_GT(bytes, 0);
 
   if (!clusters_.empty()) {
     ProbeCluster* cluster = &clusters_.front();
     if (cluster->sent_probes == 0) {
       RTC_DCHECK_EQ(cluster->time_started_ms, -1);
@@ skipping 17 matching lines @@
 
   // Compute the time delta from the cluster start to ensure probe bitrate stays
   // close to the target bitrate. Result is in milliseconds.
   int64_t delta_ms = (8000ll * cluster.sent_bytes + cluster.bitrate_bps / 2) /
                   cluster.bitrate_bps;
   return cluster.time_started_ms + delta_ms;
 }
 
 
 }  // namespace webrtc