More gracefully handle rtp timestamp jumps in the rtp to ntp estimator.

webrtc/system_wrappers/include/rtp_to_ntp_estimator.h

 /*
  *  Copyright (c) 2012 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 @@
                           uint32_t ntp_frac,
                           uint32_t rtp_timestamp,
                           bool* new_rtcp_sr);
 
   // Converts an RTP timestamp to the NTP domain in milliseconds.
   // Returns true on success, false otherwise.
   bool Estimate(int64_t rtp_timestamp, int64_t* rtp_timestamp_ms) const;
 
   const Parameters& params() const { return params_; }
 
+  static const int kMaxInvalidSamples = 3;
+
  private:
   void UpdateParameters();
 
+  int consecutive_invalid_samples_;
   std::list<RtcpMeasurement> measurements_;
   Parameters params_;
 };
 
 // Returns:
 //  1: forward wrap around.
 //  0: no wrap around.
 // -1: backwards wrap around (i.e. reordering).
 int CheckForWrapArounds(uint32_t new_timestamp, uint32_t old_timestamp);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_RTP_TO_NTP_ESTIMATOR_H_