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#pragma once
26
27#if ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)
28
29#include "AudioNode.h"
30#include "AudioSourceProviderClient.h"
31#include "MediaStream.h"
32#include "MultiChannelResampler.h"
33#include <wtf/Lock.h>
34
35namespace WebCore {
36
37class AudioContext;
38class MultiChannelResampler;
39
40class MediaStreamAudioSourceNode final : public AudioNode, public AudioSourceProviderClient {
41 WTF_MAKE_ISO_ALLOCATED(MediaStreamAudioSourceNode);
42public:
43 static Ref<MediaStreamAudioSourceNode> create(AudioContext&, MediaStream&, MediaStreamTrack&);
44
45 virtual ~MediaStreamAudioSourceNode();
46
47 MediaStream* mediaStream() { return &m_mediaStream.get(); }
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
56private:
57 MediaStreamAudioSourceNode(AudioContext&, MediaStream&, MediaStreamTrack&);
58
59 double tailTime() const override { return 0; }
60 double latencyTime() const override { return 0; }
61
62 // As an audio source, we will never propagate silence.
63 bool propagatesSilence() const override { return false; }
64
65 Ref<MediaStream> m_mediaStream;
66 Ref<MediaStreamTrack> m_audioTrack;
67 std::unique_ptr<MultiChannelResampler> m_multiChannelResampler;
68
69 Lock m_processMutex;
70
71 unsigned m_sourceNumberOfChannels { 0 };
72 double m_sourceSampleRate { 0 };
73};
74
75} // namespace WebCore
76
77#endif // ENABLE(WEB_AUDIO) && ENABLE(MEDIA_STREAM)
78