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#include "AudioBuffer.h"
28#include "AudioDestinationNode.h"
29#include <wtf/RefPtr.h>
30#include <wtf/Threading.h>
31
32namespace WebCore {
33
34class AudioBus;
35class AudioContext;
36
37class OfflineAudioDestinationNode final : public AudioDestinationNode {
38 WTF_MAKE_ISO_ALLOCATED(OfflineAudioDestinationNode);
39public:
40 static Ref<OfflineAudioDestinationNode> create(AudioContext& context, AudioBuffer* renderTarget)
41 {
42 return adoptRef(*new OfflineAudioDestinationNode(context, renderTarget));
43 }
44
45 virtual ~OfflineAudioDestinationNode();
46
47 // AudioNode
48 void initialize() override;
49 void uninitialize() override;
50
51 // AudioDestinationNode
52 void enableInput(const String&) override { }
53 void startRendering() override;
54
55 float sampleRate() const override { return m_renderTarget->sampleRate(); }
56
57private:
58 OfflineAudioDestinationNode(AudioContext&, AudioBuffer* renderTarget);
59
60 // This AudioNode renders into this AudioBuffer.
61 RefPtr<AudioBuffer> m_renderTarget;
62
63 // Temporary AudioBus for each render quantum.
64 RefPtr<AudioBus> m_renderBus;
65
66 // Rendering thread.
67 RefPtr<Thread> m_renderThread;
68 bool m_startedRendering;
69 bool offlineRender();
70};
71
72} // namespace WebCore
73