Refactor the AudioDevice for iOS and improve the performance and stability

webrtc/modules/audio_device/ios/audio_device_not_implemented_ios.mm

 /*
  *  Copyright (c) 2015 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 "webrtc/modules/audio_device/ios/audio_device_ios.h"
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 
 namespace webrtc {
 
+int32_t AudioDeviceIOS::PlayoutBuffer(AudioDeviceModule::BufferType& type,
+                                      uint16_t& sizeMS) const {
+  RTC_NOTREACHED() << "Not implemented";
+  return -1;
+}
+
 int32_t AudioDeviceIOS::ActiveAudioLayer(
     AudioDeviceModule::AudioLayer& audioLayer) const {
   audioLayer = AudioDeviceModule::kPlatformDefaultAudio;
   return 0;
 }
 
 int32_t AudioDeviceIOS::ResetAudioDevice() {
   RTC_NOTREACHED() << "Not implemented";
   return -1;
 }
@@ skipping 249 matching lines @@
   RTC_NOTREACHED() << "Not implemented";
   return -1;
 }
 
 int32_t AudioDeviceIOS::CPULoad(uint16_t&) const {
   RTC_NOTREACHED() << "Not implemented";
   return -1;
 }
 
 }  // namespace webrtc