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 MediaStreamAudioSourceNode_h
26#define MediaStreamAudioSourceNode_h
27
28#if ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)
29
30#include "AudioNode.h"
31#include "AudioSourceProvider.h"
32#include "AudioSourceProviderClient.h"
33#include "MediaStream.h"
34#include <wtf/OwnPtr.h>
35#include <wtf/PassRefPtr.h>
36#include <wtf/Threading.h>
37
38namespace WebCore {
39
40class AudioContext;
41
42class MediaStreamAudioSourceNode : public AudioNode, public AudioSourceProviderClient {
43public:
44    static PassRefPtr<MediaStreamAudioSourceNode> create(AudioContext*, MediaStream*, AudioSourceProvider*);
45
46    virtual ~MediaStreamAudioSourceNode();
47
48    MediaStream* mediaStream() { return m_mediaStream.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    AudioSourceProvider* audioSourceProvider() const { return m_audioSourceProvider; }
58
59private:
60    MediaStreamAudioSourceNode(AudioContext*, MediaStream*, AudioSourceProvider*);
61
62    virtual double tailTime() const OVERRIDE { return 0; }
63    virtual double latencyTime() const OVERRIDE { return 0; }
64
65    // As an audio source, we will never propagate silence.
66    virtual bool propagatesSilence() const OVERRIDE { return false; }
67
68    RefPtr<MediaStream> m_mediaStream;
69    AudioSourceProvider* m_audioSourceProvider;
70
71    Mutex m_processLock;
72
73    unsigned m_sourceNumberOfChannels;
74};
75
76} // namespace WebCore
77
78#endif // ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)
79
80#endif // MediaStreamAudioSourceNode_h
81