Audio extension API.

chrome/browser/extensions/api/audio/audio_service.cc

+// Copyright (c) 2013 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 "chrome/browser/extensions/api/audio/audio_service.h"
+
+namespace extensions {
+
+class AudioServiceImpl : public AudioService {
+ public:
+  AudioServiceImpl() {}
+  virtual ~AudioServiceImpl() {}
+
+  // Called by listeners to this service to add/remove themselves as observers.
+  virtual void AddObserver(Observer* observer);
+  virtual void RemoveObserver(Observer* observer);
+
+  // Start to query audio device information.
+  virtual void StartGetInfo(const GetInfoCallback& callback);
+};
+
+void AudioServiceImpl::AddObserver(Observer* observer) {
+  // TODO: implement this for platforms other than Chrome OS.
+}
+
+void AudioServiceImpl::RemoveObserver(Observer* observer) {
+  // TODO: implement this for platforms other than Chrome OS.
+}
+
+AudioService* AudioService::CreateInstance() {
+  return new AudioServiceImpl;
+}
+
+void AudioServiceImpl::StartGetInfo(const GetInfoCallback& callback) {
+  // TODO: implement this for platforms other than Chrome OS.
+  if (!callback.is_null())
+    callback.Run(OutputInfo(), InputInfo(), false);
+}
+
+}  // namespace extensions