Adding GetAudioInputDeviceNames to AudioManager, this function is supposed to do device enumerati...

media/audio/win/audio_manager_win.cc

 // Copyright (c) 2011 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_io.h"
 
 #include <windows.h>
 #include <objbase.h>  // This has to be before initguid.h
 #include <initguid.h>
 #include <mmsystem.h>
 #include <setupapi.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
+#include "base/stringprintf.h"
 #include "base/win/windows_version.h"
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/fake_audio_output_stream.h"
 #include "media/audio/win/audio_manager_win.h"
 #include "media/audio/win/wavein_input_win.h"
 #include "media/audio/win/waveout_output_win.h"
 #include "media/base/limits.h"
 
 // Libraries required for the SetupAPI and Wbem APIs used here.
 #pragma comment(lib, "setupapi.lib")
@@ skipping 215 matching lines @@
   }
 
   FilePath path;
   PathService::Get(base::DIR_SYSTEM, &path);
   path = path.Append(program);
   CommandLine command_line(path);
   command_line.AppendArg(argument);
   base::LaunchApp(command_line, false, false, NULL);
 }
 
+void AudioManagerWin::GetAudioInputDeviceNames(
+    AudioInputDeviceNames* device_names) {
+  // TODO(xians): query a full list of valid devices.
+  if (HasAudioInputDevices()) {
+    // We use (device_name)_(index) to make up the unique_ids to identify the
+    // devices. For default device, the index is 0, so its unique_id is
+    // Default_0.
+    AudioInputDeviceName name;
+    name.device_name = AudioManagerBase::kDefaultDeviceName;

[awong, 2011/05/23 17:36:15]

...This really seems odd now...

[xians, 2011/05/23 20:15:59]

We only prepend the default device to the list to display to the users.
This "Default" string is only used as the name of the default device in the
list, and when opening the device, we still use WAVE_MAPPER.

+    name.unique_id = StringPrintf("%s_0", AudioManagerBase::kDefaultDeviceName);
+    device_names->push_back(name);
+  }
+}
+
 // static
 AudioManager* AudioManager::CreateAudioManager() {
   return new AudioManagerWin();
 }