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