Piggybacking simulcast id and ALR experiment id into video content type extension.

webrtc/modules/pacing/alr_detector.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.
  */
 
 #include "webrtc/modules/pacing/alr_detector.h"
 
 #include <string>
 
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/format_macros.h"
 #include "webrtc/rtc_base/logging.h"
 #include "webrtc/rtc_base/timeutils.h"
 #include "webrtc/system_wrappers/include/field_trial.h"
 
 namespace webrtc {
 
 const char* AlrDetector::kScreenshareProbingBweExperimentName =
     "WebRTC-ProbingScreenshareBwe";
 
+const char* AlrDetector::kScreenshareProbingBweExperimentNameOnReceiveSide =
+    "WebRTC-ProbingScreenshareBwe-Receive";
+
 AlrDetector::AlrDetector()
     : bandwidth_usage_percent_(kDefaultAlrBandwidthUsagePercent),
       alr_start_budget_level_percent_(kDefaultAlrStartBudgetLevelPercent),
       alr_stop_budget_level_percent_(kDefaultAlrStopBudgetLevelPercent),
       alr_budget_(0, true) {
   rtc::Optional<AlrExperimentSettings> experiment_settings =
       ParseAlrSettingsFromFieldTrial();
   if (experiment_settings) {
     alr_stop_budget_level_percent_ =
         experiment_settings->alr_stop_budget_level_percent;
@@ skipping 39 matching lines @@
   const std::string kIgnoredSuffix = "_Dogfood";
   if (group_name.rfind(kIgnoredSuffix) ==
       group_name.length() - kIgnoredSuffix.length()) {
     group_name.resize(group_name.length() - kIgnoredSuffix.length());
   }
 
   if (group_name.empty())
     return ret;
 
   AlrExperimentSettings settings;
-  if (sscanf(group_name.c_str(), "%f,%" PRId64 ",%d,%d,%d",
+  if (sscanf(group_name.c_str(), "%f,%" PRId64 ",%d,%d,%d,%d",
              &settings.pacing_factor, &settings.max_paced_queue_time,
              &settings.alr_bandwidth_usage_percent,
              &settings.alr_start_budget_level_percent,
-             &settings.alr_stop_budget_level_percent) == 5) {
+             &settings.alr_stop_budget_level_percent,
+             &settings.group_id) == 6) {
     ret.emplace(settings);
     LOG(LS_INFO) << "Using screenshare ALR experiment settings: "
                     "pacing factor: "
                  << settings.pacing_factor << ", max pacer queue length: "
                  << settings.max_paced_queue_time
                  << ", ALR start bandwidth usage percent: "
                  << settings.alr_bandwidth_usage_percent
                  << ", ALR end budget level percent: "
                  << settings.alr_start_budget_level_percent
                  << ", ALR end budget level percent: "
-                 << settings.alr_stop_budget_level_percent;
+                 << settings.alr_stop_budget_level_percent
+                 << ", ALR experiment group ID: " << settings.group_id;
   }
 
   return ret;
 }
 
 }  // namespace webrtc