Log audio network adapter decisions in event log.

webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc

Index: webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc b/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
index 3b767d9b597b01d4670b6101350a22b91c055928..6ec92b00fc1781cc82f36399a50297992bcd5f2f 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
@@ -12,8 +12,16 @@
 
 #include <utility>
 
+#include "webrtc/base/logging.h"
+
 namespace webrtc {
 
+namespace {
+constexpr int kEventLogMinBitrateChangeBps = 5000;
+constexpr float kEventLogMinBitrateChangeFraction = 0.25;
+constexpr float kEventLogMinPacketLossChangeFraction = 0.5;
+}  // namespace
+
 AudioNetworkAdaptorImpl::Config::Config()
     : event_log(nullptr), clock(nullptr){};
 
@@ -25,7 +33,14 @@ AudioNetworkAdaptorImpl::AudioNetworkAdaptorImpl(
     std::unique_ptr<DebugDumpWriter> debug_dump_writer)
     : config_(config),
       controller_manager_(std::move(controller_manager)),
-      debug_dump_writer_(std::move(debug_dump_writer)) {
+      debug_dump_writer_(std::move(debug_dump_writer)),
+      event_log_writer_(
+          config.event_log
+              ? new EventLogWriter(config.event_log,
+                                   kEventLogMinBitrateChangeBps,
+                                   kEventLogMinBitrateChangeFraction,
+                                   kEventLogMinPacketLossChangeFraction)
+              : nullptr) {
   RTC_DCHECK(controller_manager_);
 }
 
@@ -68,11 +83,13 @@ AudioNetworkAdaptorImpl::GetEncoderRuntimeConfig() {
        controller_manager_->GetSortedControllers(last_metrics_))
     controller->MakeDecision(last_metrics_, &config);
 
-  // TODO(minyue): Add debug dumping.
   if (debug_dump_writer_)
     debug_dump_writer_->DumpEncoderRuntimeConfig(
         config, config_.clock->TimeInMilliseconds());
 
+  if (event_log_writer_)
+    event_log_writer_->MaybeLogEncoderConfig(config);
+
   return config;
 }