Switch to STA mode for audio thread and WASAPI I/O streams.

media/audio/audio_manager_base.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_manager_base.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 65 matching lines @@
       max_num_input_streams_(kDefaultMaxInputStreams),
       num_output_streams_(0),
       num_input_streams_(0),
       // TODO(dalecurtis): Switch this to an ObserverListThreadSafe, so we don't
       // block the UI thread when swapping devices.
       output_listeners_(
           ObserverList<AudioDeviceListener>::NOTIFY_EXISTING_ONLY),
       audio_thread_("AudioThread"),
       audio_log_factory_(audio_log_factory) {
 #if defined(OS_WIN)
-  audio_thread_.init_com_with_mta(true);
+  // Do not use MTA mode initalization as it causes hangs for a significant
+  // population of users and is not supported on Windows 8 for audio capture
+  // and rendering.  See http://crbug.com/422522.
+  audio_thread_.init_com_with_mta(false);
 #elif defined(OS_MACOSX)
   // CoreAudio calls must occur on the main thread of the process, which in our
   // case is sadly the browser UI thread.  Failure to execute calls on the right
   // thread leads to crashes and odd behavior.  See http://crbug.com/158170.
   // TODO(dalecurtis): We should require the message loop to be passed in.
   if (base::MessageLoopForUI::IsCurrent()) {
     task_runner_ = base::MessageLoopProxy::current();
     return;
   }
 #endif
@@ skipping 301 matching lines @@
 scoped_ptr<AudioLog> AudioManagerBase::CreateAudioLog(
     AudioLogFactory::AudioComponent component) {
   return audio_log_factory_->CreateAudioLog(component);
 }
 
 void AudioManagerBase::SetHasKeyboardMic() {
   NOTREACHED();
 }
 
 }  // namespace media