1/*
2 * Copyright (C) 2011, 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 * 1.  Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2.  Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#ifndef OfflineAudioDestinationNode_h
26#define OfflineAudioDestinationNode_h
27
28#include "modules/webaudio/AudioBuffer.h"
29#include "modules/webaudio/AudioDestinationNode.h"
30#include "public/platform/WebThread.h"
31#include "wtf/PassRefPtr.h"
32#include "wtf/RefPtr.h"
33
34namespace blink {
35
36class AudioBus;
37class AudioContext;
38
39class OfflineAudioDestinationNode FINAL : public AudioDestinationNode {
40public:
41    static OfflineAudioDestinationNode* create(AudioContext* context, AudioBuffer* renderTarget)
42    {
43        return adoptRefCountedGarbageCollectedWillBeNoop(new OfflineAudioDestinationNode(context, renderTarget));
44    }
45
46    virtual ~OfflineAudioDestinationNode();
47
48    // AudioNode
49    virtual void dispose() OVERRIDE;
50    virtual void initialize() OVERRIDE;
51    virtual void uninitialize() OVERRIDE;
52
53    // AudioDestinationNode
54    virtual void startRendering() OVERRIDE;
55
56    virtual float sampleRate()  const OVERRIDE { return m_renderTarget->sampleRate(); }
57
58    virtual void trace(Visitor*) OVERRIDE;
59
60private:
61    OfflineAudioDestinationNode(AudioContext*, AudioBuffer* renderTarget);
62
63    // This AudioNode renders into this AudioBuffer.
64    Member<AudioBuffer> m_renderTarget;
65    // Temporary AudioBus for each render quantum.
66    RefPtr<AudioBus> m_renderBus;
67
68    // Rendering thread.
69    OwnPtr<WebThread> m_renderThread;
70    bool m_startedRendering;
71    void offlineRender();
72
73    // For completion callback on main thread.
74    void notifyComplete();
75};
76
77} // namespace blink
78
79#endif // OfflineAudioDestinationNode_h
80