Add support for audio input mute detection on all platforms

media/audio/audio_input_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/audio_input_controller.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 581 matching lines @@
 
   UpdateSilenceState(level_dbfs < kSilenceThresholdDBFS);
 
   UMA_HISTOGRAM_PERCENTAGE("Media.MicrophoneVolume", microphone_volume_percent);
   log_string = base::StringPrintf(
       "AIC::OnData: microphone volume=%d%%", microphone_volume_percent);
   if (microphone_volume_percent < kLowLevelMicrophoneLevelPercent)
     log_string += " <=> low microphone level!";
   handler_->OnLog(this, log_string);
 
+  DVLOG(1) << "IsMuted: " << stream_->IsMuted();
+
   // Try to detect if the user has enabled hardware mute by pressing the mute
   // button in audio settings for the selected microphone. The idea here is to
   // detect when all input samples are zeros but the actual volume slider is
   // larger than zero. It should correspond to a hardware mute state.
   if (level_dbfs == -std::numeric_limits<float>::infinity() &&
       microphone_volume_percent > 0) {
     LogMicrophoneMuteResult(MICROPHONE_IS_MUTED);
     log_string = base::StringPrintf(
         "AIC::OnData: microphone is muted!");
     handler_->OnLog(this, log_string);
@@ skipping 55 matching lines @@
 }
 
 void AudioInputController::LogSilenceState(SilenceState value) {
   UMA_HISTOGRAM_ENUMERATION("Media.AudioInputControllerSessionSilenceReport",
                             value,
                             SILENCE_STATE_MAX + 1);
 }
 #endif
 
 }  // namespace media