Instantly pass network changes to controllers in audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/channel_controller.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 15 matching lines @@
 
 ChannelController::ChannelController(const Config& config)
     : config_(config), channels_to_encode_(config_.intial_channels_to_encode) {
   RTC_DCHECK_GT(config_.intial_channels_to_encode, 0lu);
   // Currently, we require |intial_channels_to_encode| to be <= 2.
   RTC_DCHECK_LE(config_.intial_channels_to_encode, 2lu);
   RTC_DCHECK_GE(config_.num_encoder_channels,
                 config_.intial_channels_to_encode);
 }
 
+ChannelController::~ChannelController() = default;
+
+void ChannelController::UpdateNetworkMetrics(
+    const NetworkMetrics& network_metrics) {
+  if (network_metrics.uplink_bandwidth_bps)
+    uplink_bandwidth_bps_ = network_metrics.uplink_bandwidth_bps;
+}
+
 void ChannelController::MakeDecision(
-    const NetworkMetrics& metrics,
     AudioNetworkAdaptor::EncoderRuntimeConfig* config) {
   // Decision on |num_channels| should not have been made.
   RTC_DCHECK(!config->num_channels);
 
-  if (metrics.uplink_bandwidth_bps) {
+  if (uplink_bandwidth_bps_) {
     if (channels_to_encode_ == 2 &&
-        *metrics.uplink_bandwidth_bps <= config_.channel_2_to_1_bandwidth_bps) {
+        *uplink_bandwidth_bps_ <= config_.channel_2_to_1_bandwidth_bps) {
       channels_to_encode_ = 1;
     } else if (channels_to_encode_ == 1 &&
-               *metrics.uplink_bandwidth_bps >=
-                   config_.channel_1_to_2_bandwidth_bps) {
+               *uplink_bandwidth_bps_ >= config_.channel_1_to_2_bandwidth_bps) {
       channels_to_encode_ =
           std::min(static_cast<size_t>(2), config_.num_encoder_channels);
     }
   }
   config->num_channels = rtc::Optional<size_t>(channels_to_encode_);
 }
 
 }  // namespace webrtc