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

media/audio/mac/audio_manager_mac.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 <CoreAudio/AudioHardware.h>
 
+#include "base/stringprintf.h"
 #include "base/sys_info.h"
 #include "media/audio/fake_audio_input_stream.h"
 #include "media/audio/fake_audio_output_stream.h"
 #include "media/audio/mac/audio_input_mac.h"
 #include "media/audio/mac/audio_low_latency_output_mac.h"
 #include "media/audio/mac/audio_manager_mac.h"
 #include "media/audio/mac/audio_output_mac.h"
 #include "media/base/limits.h"
 
 static const int kMaxInputChannels = 2;
@@ skipping 103 matching lines @@
 }
 
 void AudioManagerMac::MuteAll() {
   // TODO(cpu): implement.
 }
 
 void AudioManagerMac::UnMuteAll() {
   // TODO(cpu): implement.
 }
 
+void AudioManagerMac::GetAudioInputDeviceNames(
+    AudioInputDeviceNames* device_names) {
+  // TODO(xians): query a full list of valid devices.
+  if (HasAudioInputDevices()) {
+    // Add the default device to the list.

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

Does this make sense in Mac?

[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
kAudioHardwarePropertyDefaultOutputDevice.

+    // 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;
+    name.unique_id = StringPrintf("%s_0", AudioManagerBase::kDefaultDeviceName);
+    device_names->push_back(name);
+  }
+}
+
 // Called by the stream when it has been released by calling Close().
 void AudioManagerMac::ReleaseOutputStream(AudioOutputStream* stream) {
   DCHECK(stream);
   num_output_streams_--;
   delete stream;
 }
 
 // Called by the stream when it has been released by calling Close().
 void AudioManagerMac::ReleaseInputStream(PCMQueueInAudioInputStream* stream) {
   delete stream;
 }
 
 // static
 AudioManager* AudioManager::CreateAudioManager() {
   return new AudioManagerMac();
 }