1/*
2 * Copyright (C) 2010 Google 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef AudioDestinationMac_h
30#define AudioDestinationMac_h
31
32#include "AudioBus.h"
33#include "AudioDestination.h"
34#include "MediaSession.h"
35#include <AudioUnit/AudioUnit.h>
36#include <wtf/RefPtr.h>
37
38namespace WebCore {
39
40// An AudioDestination using CoreAudio's default output AudioUnit
41
42class AudioDestinationMac : public AudioDestination, public MediaSessionClient {
43public:
44    AudioDestinationMac(AudioIOCallback&, float sampleRate);
45    virtual ~AudioDestinationMac();
46
47private:
48    void configure();
49
50    // DefaultOutputUnit callback
51    static OSStatus inputProc(void* userData, AudioUnitRenderActionFlags*, const AudioTimeStamp*, UInt32 busNumber, UInt32 numberOfFrames, AudioBufferList* ioData);
52
53    OSStatus render(UInt32 numberOfFrames, AudioBufferList* ioData);
54
55    virtual MediaSession::MediaType mediaType() const override { return MediaSession::WebAudio; }
56    virtual MediaSession::MediaType presentationType() const { return MediaSession::WebAudio; }
57    virtual bool canReceiveRemoteControlCommands() const override { return false; }
58    virtual void didReceiveRemoteControlCommand(MediaSession::RemoteControlCommandType) override { }
59    virtual bool overrideBackgroundPlaybackRestriction() const override { return false; }
60
61    virtual void start() override;
62    virtual void stop() override;
63    virtual bool isPlaying() override { return m_isPlaying; }
64
65    virtual void pausePlayback() override { stop(); }
66    virtual void resumePlayback() override { start(); }
67
68    virtual float sampleRate() const override { return m_sampleRate; }
69
70    AudioUnit m_outputUnit;
71    AudioIOCallback& m_callback;
72    RefPtr<AudioBus> m_renderBus;
73
74    float m_sampleRate;
75    bool m_isPlaying;
76
77#if USE(AUDIO_SESSION)
78    std::unique_ptr<MediaSession> m_mediaSession;
79#endif
80};
81
82} // namespace WebCore
83
84#endif // AudioDestinationMac_h
85