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
new file mode 100644
index 0000000..0303c84
--- /dev/null
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.cc
@@ -0,0 +1,73 @@
+/*
+ *  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 <utility>
+
+#include "webrtc/modules/audio_coding/audio_network_adaptor/audio_network_adaptor_impl.h"
+
+namespace webrtc {
+
+AudioNetworkAdaptorImpl::Config::Config() = default;
+
+AudioNetworkAdaptorImpl::Config::~Config() = default;
+
+AudioNetworkAdaptorImpl::AudioNetworkAdaptorImpl(
+    const Config& config,
+    std::unique_ptr<ControllerManager> controller_manager)
+    : config_(config), controller_manager_(std::move(controller_manager)) {
+  RTC_DCHECK(controller_manager_);
+}
+
+AudioNetworkAdaptorImpl::~AudioNetworkAdaptorImpl() = default;
+
+void AudioNetworkAdaptorImpl::SetUplinkBandwidth(int uplink_bandwidth_bps) {
+  last_metrics_.uplink_bandwidth_bps = rtc::Optional<int>(uplink_bandwidth_bps);
+
+  // TODO(minyue): Add debug dumping.
+}
+
+void AudioNetworkAdaptorImpl::SetUplinkPacketLossFraction(
+    float uplink_packet_loss_fraction) {
+  last_metrics_.uplink_packet_loss_fraction =
+      rtc::Optional<float>(uplink_packet_loss_fraction);
+
+  // TODO(minyue): Add debug dumping.
+}
+
+AudioNetworkAdaptor::EncoderRuntimeConfig
+AudioNetworkAdaptorImpl::GetEncoderRuntimeConfig() {
+  EncoderRuntimeConfig config;
+  for (auto& controller :
+       controller_manager_->GetSortedControllers(last_metrics_))
+    controller->MakeDecision(last_metrics_, &config);
+
+  // TODO(minyue): Add debug dumping.
+
+  return config;
+}
+
+void AudioNetworkAdaptorImpl::SetReceiverFrameLengthRange(
+    int min_frame_length_ms,
+    int max_frame_length_ms) {
+  Controller::Constraints constraints;
+  constraints.receiver_frame_length_range =
+      rtc::Optional<Controller::Constraints::FrameLengthRange>(
+          Controller::Constraints::FrameLengthRange(min_frame_length_ms,
+                                                    max_frame_length_ms));
+  auto controllers = controller_manager_->GetControllers();
+  for (auto& controller : controllers)
+    controller->SetConstraints(constraints);
+}
+
+void AudioNetworkAdaptorImpl::StartDebugDump(FILE* file_handle) {
+  // TODO(minyue): Implement this method.
+}
+
+}  // namespace webrtc