Adding microphone volume support to chrome.

media/audio/mac/audio_input_mac.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/mac/audio_input_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 95 matching lines @@
       HandleError(err);
   }
   if (callback_) {
     callback_->OnClose(this);
     callback_ = NULL;
   }
   manager_->ReleaseInputStream(this);
   // CARE: This object may now be destroyed.
 }
 
+double PCMQueueInAudioInputStream::GetMaxVolume() {
+  NOTREACHED() << "Only supported for low-latency mode.";
+  return 0.0;
+}
+
+void PCMQueueInAudioInputStream::SetVolume(double volume) {
+  NOTREACHED() << "Only supported for low-latency mode.";
+}
+
+double PCMQueueInAudioInputStream::GetVolume() {
+  NOTREACHED() << "Only supported for low-latency mode.";
+  return 0.0;
+}
+
 void PCMQueueInAudioInputStream::HandleError(OSStatus err) {
   if (callback_)
     callback_->OnError(this, static_cast<int>(err));
   NOTREACHED() << "error " << GetMacOSStatusErrorString(err)
                << " (" << err << ")";
 }
 
 bool PCMQueueInAudioInputStream::SetupBuffers() {
   DCHECK(buffer_size_bytes_);
   for (int i = 0; i < kNumberBuffers; ++i) {
@@ skipping 60 matching lines @@
       // TODO(joth): PCMQueueOutAudioOutputStream uses callback_ to provide an
       // extra guard for this situation, but it seems to introduce more
       // complications than it solves (memory barrier issues accessing it from
       // multiple threads, looses the means to indicate OnClosed to client).
       // Should determine if we need to do something equivalent here.
       return;
     }
     HandleError(err);
   }
 }