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 AudioBuffer_h
30#define AudioBuffer_h
31
32#include "bindings/core/v8/ScriptWrappable.h"
33#include "wtf/Float32Array.h"
34#include "wtf/PassRefPtr.h"
35#include "wtf/RefPtr.h"
36#include "wtf/Vector.h"
37
38namespace blink {
39
40class AudioBus;
41class ExceptionState;
42
43class AudioBuffer : public GarbageCollectedFinalized<AudioBuffer>, public ScriptWrappable {
44    DEFINE_WRAPPERTYPEINFO();
45public:
46    static AudioBuffer* create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
47    static AudioBuffer* create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&);
48
49    // Returns 0 if data is not a valid audio file.
50    static AudioBuffer* createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate);
51
52    static AudioBuffer* createFromAudioBus(AudioBus*);
53
54    // Format
55    size_t length() const { return m_length; }
56    double duration() const { return length() / static_cast<double>(sampleRate()); }
57    float sampleRate() const { return m_sampleRate; }
58
59    // Channel data access
60    unsigned numberOfChannels() const { return m_channels.size(); }
61    PassRefPtr<Float32Array> getChannelData(unsigned channelIndex, ExceptionState&);
62    Float32Array* getChannelData(unsigned channelIndex);
63    void zero();
64
65    void trace(Visitor*) { }
66
67    virtual v8::Handle<v8::Object> associateWithWrapper(const WrapperTypeInfo*, v8::Handle<v8::Object> wrapper, v8::Isolate*) OVERRIDE;
68
69protected:
70    AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
71    explicit AudioBuffer(AudioBus*);
72    bool createdSuccessfully(unsigned desiredNumberOfChannels) const;
73
74    float m_sampleRate;
75    size_t m_length;
76
77    Vector<RefPtr<Float32Array> > m_channels;
78};
79
80} // namespace blink
81
82#endif // AudioBuffer_h
83