Video/Screenshare loopback tool.

webrtc/modules/pacing/alr_detector.cc

Index: webrtc/modules/pacing/alr_detector.cc
diff --git a/webrtc/modules/pacing/alr_detector.cc b/webrtc/modules/pacing/alr_detector.cc
index 993c6cd07edde5b87d2ea5f4b061dc5c183c5a40..49163cac7e37e80ff5967fd987ab255133efb02d 100644
--- a/webrtc/modules/pacing/alr_detector.cc
+++ b/webrtc/modules/pacing/alr_detector.cc
@@ -12,6 +12,7 @@
 
 #include <string>
 
+#include "webrtc/logging/rtc_event_log/rtc_event_log.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/format_macros.h"
 #include "webrtc/rtc_base/logging.h"
@@ -25,11 +26,14 @@ const char AlrDetector::kScreenshareProbingBweExperimentName[] =
 const char AlrDetector::kStrictPacingAndProbingExperimentName[] =
     "WebRTC-StrictPacingAndProbing";
 
-AlrDetector::AlrDetector()
+AlrDetector::AlrDetector() : AlrDetector(nullptr) {}
+
+AlrDetector::AlrDetector(RtcEventLog* event_log)
     : bandwidth_usage_percent_(kDefaultAlrBandwidthUsagePercent),
       alr_start_budget_level_percent_(kDefaultAlrStartBudgetLevelPercent),
       alr_stop_budget_level_percent_(kDefaultAlrStopBudgetLevelPercent),
-      alr_budget_(0, true) {
+      alr_budget_(0, true),
+      event_log_(event_log) {
   RTC_CHECK(
       field_trial::FindFullName(kStrictPacingAndProbingExperimentName)
           .empty() ||
@@ -54,7 +58,6 @@ AlrDetector::~AlrDetector() {}
 void AlrDetector::OnBytesSent(size_t bytes_sent, int64_t delta_time_ms) {
   alr_budget_.UseBudget(bytes_sent);
   alr_budget_.IncreaseBudget(delta_time_ms);
-
   if (alr_budget_.budget_level_percent() > alr_start_budget_level_percent_ &&
       !alr_started_time_ms_) {
     alr_started_time_ms_.emplace(rtc::TimeMillis());
@@ -63,6 +66,12 @@ void AlrDetector::OnBytesSent(size_t bytes_sent, int64_t delta_time_ms) {
              alr_started_time_ms_) {
     alr_started_time_ms_.reset();
   }
+  int usage = 100 - alr_budget_.budget_level_percent();
+  uint32_t usage_kbps = usage * alr_budget_.target_rate_kbps() / 200;
+  usage_kbps *= 100.0 / bandwidth_usage_percent_;
+  if (event_log_)
+    event_log_->LogAlrState(alr_started_time_ms_.has_value(),
+                            usage_kbps * 1000);
 }
 
 void AlrDetector::SetEstimatedBitrate(int bitrate_bps) {