Remove AudioDeviceObserver and make ADM not inherit from the Module interface.

modules/audio_device/linux/audio_device_alsa_linux.cc

 /*
  *  Copyright (c) 2012 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 71 matching lines @@
     _playoutBuffer(NULL),
     _recordingFramesLeft(0),
     _playoutFramesLeft(0),
     _initialized(false),
     _recording(false),
     _playing(false),
     _recIsInitialized(false),
     _playIsInitialized(false),
     _AGC(false),
     _recordingDelay(0),
-    _playoutDelay(0),
-    _playWarning(0),
-    _playError(0),
-    _recWarning(0),
-    _recError(0)
+    _playoutDelay(0)
 {
     memset(_oldKeyState, 0, sizeof(_oldKeyState));
     LOG(LS_INFO) << __FUNCTION__ << " created";
 }
 
 // ----------------------------------------------------------------------------
 //  AudioDeviceLinuxALSA - dtor
 // ----------------------------------------------------------------------------
 
 AudioDeviceLinuxALSA::~AudioDeviceLinuxALSA()
@@ skipping 52 matching lines @@
     return InitStatus::OK;
   }
 #if defined(USE_X11)
     //Get X display handle for typing detection
     _XDisplay = XOpenDisplay(NULL);
     if (!_XDisplay) {
       LOG(LS_WARNING)
           << "failed to open X display, typing detection will not work";
     }
 #endif
-    _playWarning = 0;
-    _playError = 0;
-    _recWarning = 0;
-    _recError = 0;
 
     _initialized = true;
 
     return InitStatus::OK;
 }
 
 int32_t AudioDeviceLinuxALSA::Terminate()
 {
     if (!_initialized)
     {
@@ skipping 824 matching lines @@
         // Update webrtc audio buffer with the selected parameters
         _ptrAudioBuffer->SetPlayoutSampleRate(_playoutFreq);
         _ptrAudioBuffer->SetPlayoutChannels(_playChannels);
     }
 
     // Set play buffer size
     _playoutBufferSizeIn10MS = LATE(snd_pcm_frames_to_bytes)(
         _handlePlayout, _playoutFramesIn10MS);
 
     // Init varaibles used for play
-    _playWarning = 0;
-    _playError = 0;
 
     if (_handlePlayout != NULL)
     {
         _playIsInitialized = true;
         return 0;
     }
     else
     {
         return -1;
     }
@@ skipping 411 matching lines @@
     // Adding 10ms adjusted value to the record delay due to 10ms buffering.
     delayMS = (uint16_t)(10 + _recordingDelay * 1000 / _recordingFreq);
     return 0;
 }
 
 bool AudioDeviceLinuxALSA::Playing() const
 {
     return (_playing);
 }
 
-bool AudioDeviceLinuxALSA::PlayoutWarning() const
-{
-    rtc::CritScope lock(&_critSect);
-    return (_playWarning > 0);
-}
-
-bool AudioDeviceLinuxALSA::PlayoutError() const
-{
-    rtc::CritScope lock(&_critSect);
-    return (_playError > 0);
-}
-
-bool AudioDeviceLinuxALSA::RecordingWarning() const
-{
-    rtc::CritScope lock(&_critSect);
-    return (_recWarning > 0);
-}
-
-bool AudioDeviceLinuxALSA::RecordingError() const
-{
-    rtc::CritScope lock(&_critSect);
-    return (_recError > 0);
-}
-
-void AudioDeviceLinuxALSA::ClearPlayoutWarning()
-{
-    rtc::CritScope lock(&_critSect);
-    _playWarning = 0;
-}
-
-void AudioDeviceLinuxALSA::ClearPlayoutError()
-{
-    rtc::CritScope lock(&_critSect);
-    _playError = 0;
-}
-
-void AudioDeviceLinuxALSA::ClearRecordingWarning()
-{
-    rtc::CritScope lock(&_critSect);
-    _recWarning = 0;
-}
-
-void AudioDeviceLinuxALSA::ClearRecordingError()
-{
-    rtc::CritScope lock(&_critSect);
-    _recError = 0;
-}
-
 // ============================================================================
 //                                 Private Methods
 // ============================================================================
 
 int32_t AudioDeviceLinuxALSA::GetDevicesInfo(
     const int32_t function,
     const bool playback,
     const int32_t enumDeviceNo,
     char* enumDeviceName,
     const int32_t ednLen) const
@@ skipping 501 matching lines @@
     state |= (szKey[i] ^ _oldKeyState[i]) & szKey[i];
 
   // Save old state
   memcpy((char*)_oldKeyState, (char*)szKey, sizeof(_oldKeyState));
   return (state != 0);
 #else
   return false;
 #endif
 }
 }  // namespace webrtc