Prevent busy-looping PacedSender on small packets.

webrtc/modules/pacing/bitrate_prober.h

 /*
  *  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 13 matching lines @@
  public:
   BitrateProber();
 
   void SetEnabled(bool enable);
 
   // Returns true if the prober is in a probing session, i.e., it currently
   // wants packets to be sent out according to the time returned by
   // TimeUntilNextProbe().
   bool IsProbing() const;
 
-  // Initializes a new probing session if the prober is allowed to probe.
-  void MaybeInitializeProbe(int bitrate_bps);
+  // Initializes a new probing session if the prober is allowed to probe. Does
+  // not initialize the prober unless the packet size is large enough to probe
+  // with.
+  void OnIncomingPacket(int bitrate_bps, size_t packet_size, int64_t now_ms);
 
   // Returns the number of milliseconds until the next packet should be sent to
   // get accurate probing.
   int TimeUntilNextProbe(int64_t now_ms);
 
   // Returns the number of bytes that the prober recommends for the next probe
   // packet.
   size_t RecommendedPacketSize() const;
 
   // Called to report to the prober that a packet has been sent, which helps the
   // prober know when to move to the next packet in a probe.
   void PacketSent(int64_t now_ms, size_t packet_size);
 
  private:
   enum ProbingState { kDisabled, kAllowedToProbe, kProbing, kWait };
 
   ProbingState probing_state_;
   // Probe bitrate per packet. These are used to compute the delta relative to
   // the previous probe packet based on the size and time when that packet was
   // sent.
   std::list<int> probe_bitrates_;
   size_t packet_size_last_send_;
   int64_t time_last_send_ms_;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_PACING_BITRATE_PROBER_H_