Refactor the AudioDevice for iOS and improve the performance and stability

talk/media/webrtc/webrtcvoiceengine.cc

 /*
  * libjingle
  * Copyright 2004 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 627 matching lines @@
   bool aecm_comfort_noise = false;
   if (options.aecm_generate_comfort_noise.Get(&aecm_comfort_noise)) {
     LOG(LS_VERBOSE) << "Comfort noise explicitly set to "
                     << aecm_comfort_noise << " (default is false).";
   }
 
 #if defined(IOS)
   // On iOS, VPIO provides built-in EC and AGC.
   options.echo_cancellation.Set(false);
   options.auto_gain_control.Set(false);
+  LOG(LS_INFO) << "Always disable AEC and AGC on iOS. Use built-in instead.";
 #elif defined(ANDROID)
   ec_mode = webrtc::kEcAecm;
 #endif
 
 #if defined(IOS) || defined(ANDROID)
   // Set the AGC mode for iOS as well despite disabling it above, to avoid
   // unsupported configuration errors from webrtc.
   agc_mode = webrtc::kAgcFixedDigital;
   options.typing_detection.Set(false);
   options.experimental_agc.Set(false);
@@ skipping 37 matching lines @@
         // i.e., replace the software EC with the built-in EC.
         options.echo_cancellation.Set(false);
         echo_cancellation = false;
         LOG(LS_INFO) << "Disabling EC since built-in EC will be used instead";
       }
     }
     if (voep->SetEcStatus(echo_cancellation, ec_mode) == -1) {
       LOG_RTCERR2(SetEcStatus, echo_cancellation, ec_mode);
       return false;
     } else {
-      LOG(LS_VERBOSE) << "Echo control set to " << echo_cancellation
-                      << " with mode " << ec_mode;
+      LOG(LS_INFO) << "Echo control set to " << echo_cancellation
+                   << " with mode " << ec_mode;
     }
 #if !defined(ANDROID)
     // TODO(ajm): Remove the error return on Android from webrtc.
     if (voep->SetEcMetricsStatus(echo_cancellation) == -1) {
       LOG_RTCERR1(SetEcMetricsStatus, echo_cancellation);
       return false;
     }
 #endif
     if (ec_mode == webrtc::kEcAecm) {
       if (voep->SetAecmMode(aecm_mode, aecm_comfort_noise) != 0) {
         LOG_RTCERR2(SetAecmMode, aecm_mode, aecm_comfort_noise);
         return false;
       }
     }
   }
 
   bool auto_gain_control;
   if (options.auto_gain_control.Get(&auto_gain_control)) {
     if (voep->SetAgcStatus(auto_gain_control, agc_mode) == -1) {
       LOG_RTCERR2(SetAgcStatus, auto_gain_control, agc_mode);
       return false;
     } else {
-      LOG(LS_VERBOSE) << "Auto gain set to " << auto_gain_control
-                      << " with mode " << agc_mode;
+      LOG(LS_INFO) << "Auto gain set to " << auto_gain_control << " with mode "
+                   << agc_mode;
     }
   }
 
   if (options.tx_agc_target_dbov.IsSet() ||
       options.tx_agc_digital_compression_gain.IsSet() ||
       options.tx_agc_limiter.IsSet()) {
     // Override default_agc_config_. Generally, an unset option means "leave
     // the VoE bits alone" in this function, so we want whatever is set to be
     // stored as the new "default". If we didn't, then setting e.g.
     // tx_agc_target_dbov would reset digital compression gain and limiter
@@ skipping 2906 matching lines @@
 
 int WebRtcSoundclipStream::Rewind() {
   mem_.Rewind();
   // Return -1 to keep VoiceEngine from looping.
   return (loop_) ? 0 : -1;
 }
 
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VOICE