Experiment for the nack module.

webrtc/modules/video_coding/nack_module.cc

 /*
  *  Copyright (c) 2016 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 100 matching lines @@
   nack_list_.erase(nack_list_.begin(), nack_list_.lower_bound(seq_num));
   keyframe_list_.erase(keyframe_list_.begin(),
                        keyframe_list_.lower_bound(seq_num));
 }
 
 void NackModule::UpdateRtt(int64_t rtt_ms) {
   rtc::CritScope lock(&crit_);
   rtt_ms_ = rtt_ms;
 }
 
+void NackModule::Flush() {
+  rtc::CritScope lock(&crit_);
+  nack_list_.clear();
+  keyframe_list_.clear();
+}
+
 void NackModule::Stop() {
   rtc::CritScope lock(&crit_);
   running_ = false;
 }
 
 int64_t NackModule::TimeUntilNextProcess() {
   rtc::CritScope lock(&crit_);
   return std::max<int64_t>(next_process_time_ms_ - clock_->TimeInMilliseconds(),

[stefan-webrtc, 2016/03/10 17:06:30]

I just realized that maybe we should check for -1 here and return 0 if that is
the case?

[philipel, 2016/03/11 09:24:14]

That is the current behavior, or am I missing something?

[stefan-webrtc, 2016/03/11 09:57:11]

Not explicitly. It happens to work like that because -1 -
clock_->TimeInMilliseconds() will become negative, but to make it more obvious
that we have taken care of that case I think it is reasonable to add a separate 
if (next_process_time_ms_ == -1) 
  return 0;

[philipel, 2016/03/11 10:12:59]

Acknowledged.

                            0);
 }
 
 void NackModule::Process() {
   rtc::CritScope lock(&crit_);
   if (!running_)
     return;
 
   // Update the next_process_time_ms_ in intervals to achieve
   // the targeted frequency over time. Also add multiple intervals
@@ skipping 109 matching lines @@
   reordering_histogram_.Add(diff);
 }
 
 int NackModule::WaitNumberOfPackets(float probability) const {
   if (reordering_histogram_.NumValues() == 0)
     return 0;
   return reordering_histogram_.InverseCdf(probability);
 }
 
 }  // namespace webrtc