1/* 2 * Copyright (C) 2014 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef AudioHardwareListener_h 27#define AudioHardwareListener_h 28 29#include <wtf/PassRefPtr.h> 30#include <wtf/RefCounted.h> 31 32namespace WebCore { 33 34enum AudioHardwareActivityType { 35 Unknown, 36 IsActive, 37 IsInactive 38}; 39 40class AudioHardwareListener : public RefCounted<AudioHardwareListener> { 41public: 42 class Client { 43 public: 44 virtual ~Client() { } 45 virtual void audioHardwareDidBecomeActive() = 0; 46 virtual void audioHardwareDidBecomeInactive() = 0; 47 virtual void audioOutputDeviceChanged() = 0; 48 }; 49 50 static PassRefPtr<AudioHardwareListener> create(Client&); 51 virtual ~AudioHardwareListener() { } 52 53 AudioHardwareActivityType hardwareActivity() const { return m_activity; } 54 bool outputDeviceSupportsLowPowerMode() const { return m_outputDeviceSupportsLowPowerMode; } 55 56protected: 57 AudioHardwareListener(Client&); 58 59 void setHardwareActivity(AudioHardwareActivityType activity) { m_activity = activity; } 60 void setOutputDeviceSupportsLowPowerMode(bool support) { m_outputDeviceSupportsLowPowerMode = support; } 61 62 Client& m_client; 63 AudioHardwareActivityType m_activity; 64 bool m_outputDeviceSupportsLowPowerMode; 65}; 66 67} 68 69#endif // AudioHardwareListener_h 70