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 Computer, 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 <AudioUnit/AudioUnit.h>
35 
36 namespace WebCore {
37 
38 // An AudioDestination using CoreAudio's default output AudioUnit
39 
40 class AudioDestinationMac : public AudioDestination {
41 public:
42     AudioDestinationMac(AudioSourceProvider&, double sampleRate);
43     virtual ~AudioDestinationMac();
44 
45     virtual void start();
46     virtual void stop();
isPlaying()47     bool isPlaying() { return m_isPlaying; }
48 
sampleRate()49     double sampleRate() const { return m_sampleRate; }
50 
51 private:
52     void configure();
53 
54     // DefaultOutputUnit callback
55     static OSStatus inputProc(void* userData, AudioUnitRenderActionFlags*, const AudioTimeStamp*, UInt32 busNumber, UInt32 numberOfFrames, AudioBufferList* ioData);
56 
57     OSStatus render(UInt32 numberOfFrames, AudioBufferList* ioData);
58 
59     AudioUnit m_outputUnit;
60     AudioSourceProvider& m_provider;
61     AudioBus m_renderBus;
62 
63     double m_sampleRate;
64     bool m_isPlaying;
65 };
66 
67 } // namespace WebCore
68 
69 #endif // AudioDestinationMac_h
70