Adds support for capture device enumeration on Windows.

media/audio/win/device_enumeration_win.h

+// 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.
+
+#ifndef MEDIA_AUDIO_WIN_DEVICE_ENUMERATION_WIN_H_
+#define MEDIA_AUDIO_WIN_DEVICE_ENUMERATION_WIN_H_
+
+#include "media/audio/audio_device_name.h"
+
+// Returns a list of audio input device structures (name and unique device ID)
+// using the MMDevice API which is supported on Windows Vista and higher.
+// Example record in the output list:
+// - device_name: "Microphone (Realtek High Definition Audio)".
+// - unique_id: "{0.0.1.00000000}.{8db6020f-18e3-4f25-b6f5-7726c9122574}"
+// This method must be called from a COM thread using MTA.
+bool GetInputDeviceNamesWin(media::AudioDeviceNames* device_names);
+
+// Returns a list of audio input device structures (name and unique device ID)
+// using the WaveIn API which is supported on Windows XP and higher.
+// Example record in the output list:
+// - device_name: "Microphone (Realtek High Defini".
+// - unique_id: "Microphone (Realtek High Defini" (same as friendly name).
+bool GetInputDeviceNamesWinXP(media::AudioDeviceNames* device_names);
+
+#endif  // MEDIA_AUDIO_WIN_DEVICE_ENUMERATION_WIN_H_
+