Handle audio device changes on Windows.

media/audio/win/audio_manager_win.cc

Index: media/audio/win/audio_manager_win.cc
diff --git a/media/audio/win/audio_manager_win.cc b/media/audio/win/audio_manager_win.cc
index 4449d150d14019ae05a71f8aa2d8b77642cd5638..71c3e8c68da1c521f420072852d353eb1dbfb8d3 100644
--- a/media/audio/win/audio_manager_win.cc
+++ b/media/audio/win/audio_manager_win.cc
@@ -10,10 +10,13 @@
 #include <mmsystem.h>
 #include <setupapi.h>
 
+#include "base/bind.h"

[henrika (OOO until Aug 14), 2012/10/25 18:12:56]

Fix order.

[DaleCurtis, 2012/10/25 20:27:37]

Done. Removed a bunch of unused imports too.

+#include "base/bind_helpers.h"
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
@@ -112,6 +115,7 @@ AudioManagerWin::AudioManagerWin() {
 }
 
 AudioManagerWin::~AudioManagerWin() {
+  output_device_listener_.reset();
   Shutdown();
 }
 
@@ -123,6 +127,14 @@ bool AudioManagerWin::HasAudioInputDevices() {
   return (::waveInGetNumDevs() != 0);
 }
 
+void AudioManagerWin::InitializeOnAudioThread() {
+  // AudioDeviceListenerWin must be initialized on a COM thread.
+  if (media::IsWASAPISupported()) {
+    output_device_listener_.reset(new AudioDeviceListenerWin(base::Bind(
+        &AudioManagerWin::OnDeviceChange, base::Unretained(this))));
+  }
+}
+
 string16 AudioManagerWin::GetAudioInputDeviceModel() {
   // Get the default audio capture device and its device interface name.
   DWORD device_id = 0;
@@ -345,4 +357,12 @@ AudioParameters AudioManagerWin::GetPreferredLowLatencyOutputStreamParameters(
       sample_rate, bits_per_sample, GetAudioHardwareBufferSize());
 }
 
+void AudioManagerWin::OnDeviceChange() {
+  // We should only fire device changes when we're creating low latency streams.
+  DCHECK(media::IsWASAPISupported());
+  GetMessageLoop()->PostTask(FROM_HERE, base::Bind(
+      &AudioManagerWin::NotifyAllOutputDeviceChangeListeners,
+      base::Unretained(this)));
+}
+
 }  // namespace media