Get audio_unittests passing with h/w on windows.

media/audio/audio_manager.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.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/alias.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_monitor.h"
 #include "build/build_config.h"
 #include "media/audio/audio_manager_factory.h"
 #include "media/audio/fake_audio_log_factory.h"
 #include "media/base/media_switches.h"
 
+#if defined(OS_WIN)
+#include "base/win/scoped_com_initializer.h"
+#endif
+
 namespace media {
 namespace {
 
 // The singleton instance of AudioManager. This is set when Create() is called.
 AudioManager* g_last_created = NULL;
 
 // The singleton instance of AudioManagerFactory. This is only set if
 // SetFactory() is called. If it is set when Create() is called, its
 // CreateInstance() function is used to set |g_last_created|. Otherwise, the
 // linked implementation of media::CreateAudioManager is used to set
@@ skipping 82 matching lines @@
     // Don't hold the lock while posting the next task.
     g_last_created->GetTaskRunner()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&AudioManagerHelper::UpdateLastAudioThreadTimeTick,
                    base::Unretained(this)),
         max_hung_task_time_ / 10);
   }
 
   AudioLogFactory* fake_log_factory() { return &fake_log_factory_; }
 
+#if defined(OS_WIN)
+  // This should be called before creating an AudioManager in tests to ensure
+  // that the creating thread is COM initialized.
+  void InitializeCOMForTesting() {
+    com_initializer_for_testing_.reset(new base::win::ScopedCOMInitializer(
+        base::win::ScopedCOMInitializer::kMTA));

[DaleCurtis, 2015/05/07 02:11:12]

Did using a regular initializer (i.e. w/ MTA) fail?

+  }
+#endif
+
  private:
   FakeAudioLogFactory fake_log_factory_;
 
   const base::TimeDelta max_hung_task_time_;
   scoped_refptr<base::SingleThreadTaskRunner> monitor_task_runner_;
 
   base::Lock hang_lock_;
   bool hang_detection_enabled_;
   base::TimeTicks last_audio_thread_timer_tick_;
   int hang_failures_;
 
+#if defined(OS_WIN)
+  scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_for_testing_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerHelper);
 };
 
 static bool g_hang_monitor_enabled = false;
 
 static base::LazyInstance<AudioManagerHelper>::Leaky g_helper =
     LAZY_INSTANCE_INITIALIZER;
 }  // namespace
 
 // Forward declaration of the platform specific AudioManager factory function.
@@ skipping 41 matching lines @@
   if (g_hang_monitor_enabled ||
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableAudioHangMonitor)) {
     g_helper.Pointer()->StartHangTimer(monitor_task_runner);
   }
   return manager;
 }
 
 // static
 AudioManager* AudioManager::CreateForTesting() {
+#if defined(OS_WIN)
+  g_helper.Pointer()->InitializeCOMForTesting();
+#endif
   return Create(g_helper.Pointer()->fake_log_factory());
 }
 
 // static
 void AudioManager::EnableHangMonitor() {
   CHECK(!g_last_created);
 // On OSX the audio thread is the UI thread, for which a hang monitor is not
 // necessary or recommended.  If it's manually requested, we should allow it
 // to start though.
 #if !defined(OS_MACOSX)
   g_hang_monitor_enabled = true;
 #endif
 }
 
 // static
 AudioManager* AudioManager::Get() {
   return g_last_created;
 }
 
 }  // namespace media