Get audio_unittests passing with h/w on windows.

media/audio/win/audio_output_win_unittest.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 <windows.h>
 #include <mmsystem.h>
 
 #include "base/basictypes.h"
 #include "base/base_paths.h"
 #include "base/memory/aligned_memory.h"
@@ skipping 12 matching lines @@
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::DoAll;
 using ::testing::Field;
 using ::testing::Invoke;
 using ::testing::InSequence;
 using ::testing::NiceMock;
 using ::testing::NotNull;
 using ::testing::Return;
 
-using base::win::ScopedCOMInitializer;
-
 namespace media {
 
 static const wchar_t kAudioFile1_16b_m_16K[]
     = L"media\\test\\data\\sweep02_16b_mono_16KHz.raw";
 
 static int ClearData(AudioBus* audio_bus, uint32 total_bytes_delay) {
   audio_bus->Zero();
   return audio_bus->frames();
 }
 
@@ skipping 370 matching lines @@
   oas->Close();
 }
 
 // With the low latency mode, WASAPI is utilized by default for Vista and
 // higher and Wave is used for XP and lower. It is possible to utilize a
 // smaller buffer size for WASAPI than for Wave.
 TEST(WinAudioTest, PCMWaveStreamPlay200HzToneLowLatency) {
   scoped_ptr<AudioManager> audio_man(AudioManager::CreateForTesting());
   ABORT_AUDIO_TEST_IF_NOT(audio_man->HasAudioOutputDevices());
 
-  // The WASAPI API requires a correct COM environment.
-  ScopedCOMInitializer com_init(ScopedCOMInitializer::kMTA);
-
   // Use 10 ms buffer size for WASAPI and 50 ms buffer size for Wave.
   // Take the existing native sample rate into account.
   const AudioParameters params = audio_man->GetDefaultOutputStreamParameters();
   int sample_rate = params.sample_rate();
   uint32 samples_10_ms = sample_rate / 100;
   int n = 1;
   (base::win::GetVersion() <= base::win::VERSION_XP) ? n = 5 : n = 1;
   AudioOutputStream* oas = audio_man->MakeAudioOutputStream(
       AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY,
                       CHANNEL_LAYOUT_MONO, sample_rate,
@@ skipping 187 matching lines @@
   oas->Start(&source);
 
   ::WaitForSingleObject(thread, INFINITE);
   ::CloseHandle(thread);
 
   oas->Stop();
   oas->Close();
 }
 
 }  // namespace media