Adds support for capture device enumeration on Windows.

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/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_low_latency_input_win.h"
 #include "media/audio/win/audio_low_latency_output_win.h"
 #include "media/audio/win/audio_manager_win.h"
+#include "media/audio/win/device_enumeration_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")
 
 // The following are defined in various DDK headers, and we (re)define them
 // here to avoid adding the DDK as a chrome dependency.
 #define DRV_QUERYDEVICEINTERFACE 0x80c
@@ skipping 55 matching lines @@
   }
 
   SetupDiSetDeviceInstallParams(device_info, device_data,
                                 &old_device_install_params);
 
   return device_and_driver_info;
 }
 
 AudioManagerWin::AudioManagerWin()
     : num_output_streams_(0) {
+  if (base::win::GetVersion() <= base::win::VERSION_XP) {
+    // Use the Wave API for device enumeration if XP or lower.
+    enumeration_type_ = kWaveEnumeration;
+  } else {
+    // Use the MMDevice API for device enumeration if Vista or higher.
+    enumeration_type_ = kMMDeviceEnumeration;
+  }
 }
 
 AudioManagerWin::~AudioManagerWin() {
 }
 
 bool AudioManagerWin::HasAudioOutputDevices() {
   return (::waveOutGetNumDevs() != 0);
 }
 
 bool AudioManagerWin::HasAudioInputDevices() {
@@ skipping 161 matching lines @@
   FilePath path;
   PathService::Get(base::DIR_SYSTEM, &path);
   path = path.Append(program);
   CommandLine command_line(path);
   command_line.AppendArg(argument);
   base::LaunchProcess(command_line, base::LaunchOptions(), NULL);
 }
 
 void AudioManagerWin::GetAudioInputDeviceNames(
     media::AudioDeviceNames* device_names) {
-  // TODO(xians): query a full list of valid devices.
-  if (HasAudioInputDevices()) {
-    // Add the default device to the list.
-    // We use index 0 to make up the unique_id to identify the
-    // default devices.
+  DCHECK(enumeration_type() !=  kUninitializedEnumeration);
+  // Enumerate all active audio-endpoint capture devices.
+  if (enumeration_type() == kWaveEnumeration) {
+    // Utilize the Wave API for Windows XP.
+    GetInputDeviceNamesWinXP(device_names);
+  } else {
+    // Utilize the MMDevice API (part of Core Audio) for Vista and higher.
+    GetInputDeviceNamesWin(device_names);
+  }
+
+  // Always add default device parameters as first element.
+  if (!device_names->empty()) {
     media::AudioDeviceName name;
     name.device_name = AudioManagerBase::kDefaultDeviceName;
     name.unique_id = AudioManagerBase::kDefaultDeviceId;
-    device_names->push_back(name);
+    device_names->push_front(name);
   }
 }
 
-// static
+/// static
 AudioManager* AudioManager::CreateAudioManager() {
   return new AudioManagerWin();
 }