Handle audio device changes on Windows.

media/audio/audio_output_controller_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 "base/bind.h"
 #include "base/environment.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 241 matching lines @@
 
   MockAudioOutputControllerSyncReader sync_reader;
   EXPECT_CALL(sync_reader, UpdatePendingBytes(_))
       .Times(AtLeast(1));
   EXPECT_CALL(sync_reader, Read(_, _))
       .WillRepeatedly(DoAll(ClearBuffer(), SignalEvent(&event), Return(4)));
   EXPECT_CALL(sync_reader, DataReady())
       .WillRepeatedly(Return(true));
   EXPECT_CALL(sync_reader, Close());
 
-  AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR, kChannelLayout,
+  AudioParameters params(AudioParameters::AUDIO_PCM_LOW_LATENCY, kChannelLayout,
                          kSampleRate, kBitsPerSample, kSamplesPerPacket);
   scoped_refptr<AudioOutputController> controller =
       AudioOutputController::Create(
           audio_manager.get(), &event_handler, params, &sync_reader);
   ASSERT_TRUE(controller.get());
 
   // Wait for OnCreated() to be called.
   event.Wait();
 
   ASSERT_FALSE(play_event.IsSignaled());
   controller->Play();
   play_event.Wait();
 
   // Force a state change and wait for the stream to come back to playing state.
   play_event.Reset();
   audio_manager->GetMessageLoop()->PostTask(FROM_HERE,
       base::Bind(&AudioOutputController::OnDeviceChange, controller));
   play_event.Wait();
 
   // Now stop the controller.
   CloseAudioController(controller);
 }
 
 }  // namespace media