Adds logging in combination with restart of audio unit

webrtc/modules/audio_device/ios/audio_device_ios.mm

 /*
  *  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 684 matching lines @@
   // If we're initialized, we must have an audio unit.
   RTC_DCHECK(audio_unit_);
 
   bool should_initialize_audio_unit = false;
   bool should_uninitialize_audio_unit = false;
   bool should_start_audio_unit = false;
   bool should_stop_audio_unit = false;
 
   switch (audio_unit_->GetState()) {
     case VoiceProcessingAudioUnit::kInitRequired:
+      RTCLog(@"VPAU state: InitRequired");
       RTC_NOTREACHED();
       break;
     case VoiceProcessingAudioUnit::kUninitialized:
+      RTCLog(@"VPAU state: Uninitialized");
       should_initialize_audio_unit = can_play_or_record;
       should_start_audio_unit = should_initialize_audio_unit &&
           (playing_ || recording_);
       break;
     case VoiceProcessingAudioUnit::kInitialized:
+      RTCLog(@"VPAU state: Initialized");
       should_start_audio_unit =
           can_play_or_record && (playing_ || recording_);
       should_uninitialize_audio_unit = !can_play_or_record;
       break;
     case VoiceProcessingAudioUnit::kStarted:
+      RTCLog(@"VPAU state: Started");
       RTC_DCHECK(playing_ || recording_);
       should_stop_audio_unit = !can_play_or_record;
       should_uninitialize_audio_unit = should_stop_audio_unit;
       break;
   }
 
   if (should_initialize_audio_unit) {
     RTCLog(@"Initializing audio unit for UpdateAudioUnit");
     ConfigureAudioSession();
     SetupAudioBuffersForActiveAudioSession();
     if (!audio_unit_->Initialize(playout_parameters_.sample_rate())) {
       RTCLogError(@"Failed to initialize audio unit.");
       return;
     }
   }
 
   if (should_start_audio_unit) {
     RTCLog(@"Starting audio unit for UpdateAudioUnit");
+    // Log session settings before trying to start audio streaming.
+    RTCAudioSession* session = [RTCAudioSession sharedInstance];
+    RTCLog(@"%@", session);
     if (!audio_unit_->Start()) {
       RTCLogError(@"Failed to start audio unit.");
       return;
     }
   }
 
   if (should_stop_audio_unit) {
     RTCLog(@"Stopping audio unit for UpdateAudioUnit");
     if (!audio_unit_->Stop()) {
       RTCLogError(@"Failed to stop audio unit.");
@@ skipping 85 matching lines @@
 
   // All I/O should be stopped or paused prior to deactivating the audio
   // session, hence we deactivate as last action.
   [session lockForConfiguration];
   UnconfigureAudioSession();
   [session endWebRTCSession:nil];
   [session unlockForConfiguration];
 }
 
 }  // namespace webrtc