1/*
2 * Copyright (C) 2012, 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 MediaStreamAudioDestinationNode_h
26#define MediaStreamAudioDestinationNode_h
27
28#if ENABLE(WEB_AUDIO)
29
30#include "platform/audio/AudioBus.h"
31#include "modules/mediastream/MediaStream.h"
32#include "modules/webaudio/AudioBasicInspectorNode.h"
33#include "wtf/OwnPtr.h"
34#include "wtf/PassRefPtr.h"
35
36namespace blink {
37
38class AudioContext;
39
40class MediaStreamAudioDestinationNode FINAL : public AudioBasicInspectorNode {
41    DEFINE_WRAPPERTYPEINFO();
42public:
43    static MediaStreamAudioDestinationNode* create(AudioContext*, size_t numberOfChannels);
44    virtual ~MediaStreamAudioDestinationNode();
45    virtual void trace(Visitor*) OVERRIDE;
46
47    MediaStream* stream() { return m_stream.get(); }
48
49    // AudioNode.
50    virtual void dispose() OVERRIDE;
51    virtual void process(size_t framesToProcess) OVERRIDE;
52
53private:
54    MediaStreamAudioDestinationNode(AudioContext*, size_t numberOfChannels);
55
56    virtual double tailTime() const OVERRIDE { return 0; }
57    virtual double latencyTime() const OVERRIDE { return 0; }
58
59    // As an audio source, we will never propagate silence.
60    virtual bool propagatesSilence() const OVERRIDE { return false; }
61
62    Member<MediaStream> m_stream;
63    RefPtr<MediaStreamSource> m_source;
64    RefPtr<AudioBus> m_mixBus;
65};
66
67} // namespace blink
68
69#endif // ENABLE(WEB_AUDIO)
70
71#endif // MediaStreamAudioDestinationNode_h
72