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 | |
36 | namespace WebCore { |
37 | |
38 | class AudioContext; |
39 | |
40 | class MediaElementAudioSourceNode final : public AudioNode, public AudioSourceProviderClient { |
41 | WTF_MAKE_ISO_ALLOCATED(MediaElementAudioSourceNode); |
42 | public: |
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 | |
59 | private: |
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 | |