1/* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * Copyright (C) 2011 Apple Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 15 * its contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#ifndef AudioDestinationIOS_h 31#define AudioDestinationIOS_h 32 33#include "AudioBus.h" 34#include "AudioDestination.h" 35#include "AudioSessionListener.h" 36#include <AudioUnit/AudioUnit.h> 37#include <wtf/RefPtr.h> 38 39namespace WebCore { 40 41// An AudioDestination using CoreAudio's default output AudioUnit 42 43class AudioDestinationIOS : public AudioDestination, public AudioSessionListener { 44public: 45 AudioDestinationIOS(AudioIOCallback&, double sampleRate); 46 virtual ~AudioDestinationIOS(); 47 48 virtual void start(); 49 virtual void stop(); 50 bool isPlaying() { return m_isPlaying; } 51 52 float sampleRate() const { return m_sampleRate; } 53 54private: 55 void configure(); 56 virtual void beganAudioInterruption() OVERRIDE; 57 virtual void endedAudioInterruption() OVERRIDE; 58 59 // DefaultOutputUnit callback 60 static OSStatus inputProc(void* userData, AudioUnitRenderActionFlags*, const AudioTimeStamp*, UInt32 busNumber, UInt32 numberOfFrames, AudioBufferList* ioData); 61 static void frameSizeChangedProc(void *inRefCon, AudioUnit inUnit, AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement); 62 63 friend float AudioDestination::hardwareSampleRate(); 64 65 OSStatus render(UInt32 numberOfFrames, AudioBufferList* ioData); 66 67 AudioUnit m_outputUnit; 68 AudioIOCallback& m_callback; 69 RefPtr<AudioBus> m_renderBus; 70 71 double m_sampleRate; 72 bool m_isPlaying; 73 bool m_interruptedOnPlayback; 74}; 75 76} // namespace WebCore 77 78#endif // AudioDestinationIOS_h 79