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#pragma once
26
27#if ENABLE(WEB_AUDIO) && ENABLE(VIDEO)
28
29#include "AudioNode.h"
30#include "AudioSourceProviderClient.h"
31#include "HTMLMediaElement.h"
32#include "MultiChannelResampler.h"
33#include <memory>
34#include <wtf/Lock.h>
35
36namespace WebCore {
37
38class AudioContext;
39
40class MediaElementAudioSourceNode final : public AudioNode, public AudioSourceProviderClient {
41 WTF_MAKE_ISO_ALLOCATED(MediaElementAudioSourceNode);
42public:
43 static Ref<MediaElementAudioSourceNode> create(AudioContext&, HTMLMediaElement&);
44
45 virtual ~MediaElementAudioSourceNode();
46
47 HTMLMediaElement& mediaElement() { return m_mediaElement; }
48
49 // AudioNode
50 void process(size_t framesToProcess) override;
51 void reset() override;
52
53 // AudioSourceProviderClient
54 void setFormat(size_t numberOfChannels, float sampleRate) override;
55
56 void lock();
57 void unlock();
58
59private:
60 MediaElementAudioSourceNode(AudioContext&, HTMLMediaElement&);
61
62 double tailTime() const override { return 0; }
63 double latencyTime() const override { return 0; }
64
65 // As an audio source, we will never propagate silence.
66 bool propagatesSilence() const override { return false; }
67
68 bool wouldTaintOrigin();
69
70 Ref<HTMLMediaElement> m_mediaElement;
71 Lock m_processMutex;
72
73 unsigned m_sourceNumberOfChannels;
74 double m_sourceSampleRate;
75 bool m_muted { false };
76
77 std::unique_ptr<MultiChannelResampler> m_multiChannelResampler;
78};
79
80} // namespace WebCore
81
82#endif // ENABLE(WEB_AUDIO) && ENABLE(VIDEO)
83