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 MediaElementAudioSourceNode_h
26#define MediaElementAudioSourceNode_h
27
28#if ENABLE(WEB_AUDIO)
29
30#include "core/html/HTMLMediaElement.h"
31#include "core/platform/audio/AudioSourceProviderClient.h"
32#include "core/platform/audio/MultiChannelResampler.h"
33#include "modules/webaudio/AudioSourceNode.h"
34#include "wtf/OwnPtr.h"
35#include "wtf/PassRefPtr.h"
36#include "wtf/Threading.h"
37
38namespace WebCore {
39
40class AudioContext;
41
42class MediaElementAudioSourceNode : public AudioSourceNode, public AudioSourceProviderClient {
43public:
44    static PassRefPtr<MediaElementAudioSourceNode> create(AudioContext*, HTMLMediaElement*);
45
46    virtual ~MediaElementAudioSourceNode();
47
48    HTMLMediaElement* mediaElement() { return m_mediaElement.get(); }
49
50    // AudioNode
51    virtual void process(size_t framesToProcess);
52    virtual void reset();
53
54    // AudioSourceProviderClient
55    virtual void setFormat(size_t numberOfChannels, float sampleRate);
56
57    void lock();
58    void unlock();
59
60private:
61    MediaElementAudioSourceNode(AudioContext*, HTMLMediaElement*);
62
63    // As an audio source, we will never propagate silence.
64    virtual bool propagatesSilence() const OVERRIDE { return false; }
65
66    RefPtr<HTMLMediaElement> m_mediaElement;
67    Mutex m_processLock;
68
69    unsigned m_sourceNumberOfChannels;
70    double m_sourceSampleRate;
71
72    OwnPtr<MultiChannelResampler> m_multiChannelResampler;
73};
74
75} // namespace WebCore
76
77#endif // ENABLE(WEB_AUDIO)
78
79#endif // MediaElementAudioSourceNode_h
80