Relanding of "Adding BitrateController to audio network adaptor."

webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.h

 /*
  *  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.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_DTX_CONTROLLER_H_
-#define WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_DTX_CONTROLLER_H_
+#ifndef WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_BITRATE_CONTROLLER_H_
+#define WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_BITRATE_CONTROLLER_H_
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/modules/audio_coding/audio_network_adaptor/controller.h"
 
 namespace webrtc {
+namespace audio_network_adaptor {
 
-class DtxController final : public Controller {
+class BitrateController final : public Controller {
  public:
   struct Config {
-    Config(bool initial_dtx_enabled,
-           int dtx_enabling_bandwidth_bps,
-           int dtx_disabling_bandwidth_bps);
-    bool initial_dtx_enabled;
-    // Uplink bandwidth below which DTX should be switched on.
-    int dtx_enabling_bandwidth_bps;
-    // Uplink bandwidth above which DTX should be switched off.
-    int dtx_disabling_bandwidth_bps;
+    Config(int initial_bitrate_bps, int frame_length_ms);
+    ~Config();
+    int initial_bitrate_bps;
+    int initial_frame_length_ms;
   };
 
-  explicit DtxController(const Config& config);
+  explicit BitrateController(const Config& config);
 
   void MakeDecision(const NetworkMetrics& metrics,
                     AudioNetworkAdaptor::EncoderRuntimeConfig* config) override;
 
  private:
   const Config config_;
-  bool dtx_enabled_;
-  RTC_DISALLOW_COPY_AND_ASSIGN(DtxController);
+  int bitrate_bps_;
+  int overhead_rate_bps_;
+  RTC_DISALLOW_COPY_AND_ASSIGN(BitrateController);
 };
 
+}  // namespace audio_network_adaptor
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_DTX_CONTROLLER_H_
+#endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_BITRATE_CONTROLLER_H_