Instantly pass network changes to controllers in audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.cc

Index: webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.cc
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.cc b/webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.cc
index 2f64df066b36bba2ec8bd963627bf594e3c66dd0..df0b470116b72f414a6bc3be1a7e4df86caf008d 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.cc
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.cc
@@ -33,12 +33,21 @@ BitrateController::BitrateController(const Config& config)
   RTC_DCHECK_GT(frame_length_ms_, 0);
 }
 
+BitrateController::~BitrateController() = default;
+
+void BitrateController::UpdateNetworkMetrics(
+    const NetworkMetrics& network_metrics) {
+  if (network_metrics.target_audio_bitrate_bps)
+    target_audio_bitrate_bps_ = network_metrics.target_audio_bitrate_bps;
+  if (network_metrics.overhead_bytes_per_packet)
+    overhead_bytes_per_packet_ = network_metrics.overhead_bytes_per_packet;
+}
+
 void BitrateController::MakeDecision(
-    const NetworkMetrics& metrics,
     AudioNetworkAdaptor::EncoderRuntimeConfig* config) {
   // Decision on |bitrate_bps| should not have been made.
   RTC_DCHECK(!config->bitrate_bps);
-  if (metrics.target_audio_bitrate_bps && metrics.overhead_bytes_per_packet) {
+  if (target_audio_bitrate_bps_ && overhead_bytes_per_packet_) {
     // Current implementation of BitrateController can only work when
     // |metrics.target_audio_bitrate_bps| includes overhead is enabled. This is
     // currently governed by the following field trial.
@@ -47,9 +56,8 @@ void BitrateController::MakeDecision(
     if (config->frame_length_ms)
       frame_length_ms_ = *config->frame_length_ms;
     int overhead_rate_bps =
-        *metrics.overhead_bytes_per_packet * 8 * 1000 / frame_length_ms_;
-    bitrate_bps_ =
-        std::max(0, *metrics.target_audio_bitrate_bps - overhead_rate_bps);
+        *overhead_bytes_per_packet_ * 8 * 1000 / frame_length_ms_;
+    bitrate_bps_ = std::max(0, *target_audio_bitrate_bps_ - overhead_rate_bps);
   }
   config->bitrate_bps = rtc::Optional<int>(bitrate_bps_);
 }