1 | /* |
2 | * Copyright (C) 2010, 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 | #include "config.h" |
26 | |
27 | #if ENABLE(WEB_AUDIO) |
28 | |
29 | #include "AudioDestinationNode.h" |
30 | |
31 | #include "AudioContext.h" |
32 | #include "AudioNodeInput.h" |
33 | #include "AudioNodeOutput.h" |
34 | #include "AudioUtilities.h" |
35 | #include "DenormalDisabler.h" |
36 | #include <wtf/IsoMallocInlines.h> |
37 | |
38 | namespace WebCore { |
39 | |
40 | WTF_MAKE_ISO_ALLOCATED_IMPL(AudioDestinationNode); |
41 | |
42 | AudioDestinationNode::AudioDestinationNode(AudioContext& context, float sampleRate) |
43 | : AudioNode(context, sampleRate) |
44 | , m_currentSampleFrame(0) |
45 | , m_isSilent(true) |
46 | , m_isEffectivelyPlayingAudio(false) |
47 | , m_muted(false) |
48 | { |
49 | setNodeType(NodeTypeDestination); |
50 | addInput(std::make_unique<AudioNodeInput>(this)); |
51 | } |
52 | |
53 | AudioDestinationNode::~AudioDestinationNode() |
54 | { |
55 | uninitialize(); |
56 | } |
57 | |
58 | void AudioDestinationNode::render(AudioBus*, AudioBus* destinationBus, size_t numberOfFrames) |
59 | { |
60 | // We don't want denormals slowing down any of the audio processing |
61 | // since they can very seriously hurt performance. |
62 | // This will take care of all AudioNodes because they all process within this scope. |
63 | DenormalDisabler denormalDisabler; |
64 | |
65 | context().setAudioThread(Thread::current()); |
66 | |
67 | if (!context().isInitialized()) { |
68 | destinationBus->zero(); |
69 | setIsSilent(true); |
70 | return; |
71 | } |
72 | |
73 | ASSERT(numberOfFrames); |
74 | if (!numberOfFrames) { |
75 | destinationBus->zero(); |
76 | setIsSilent(true); |
77 | return; |
78 | } |
79 | |
80 | // Let the context take care of any business at the start of each render quantum. |
81 | context().handlePreRenderTasks(); |
82 | |
83 | // This will cause the node(s) connected to us to process, which in turn will pull on their input(s), |
84 | // all the way backwards through the rendering graph. |
85 | AudioBus* renderedBus = input(0)->pull(destinationBus, numberOfFrames); |
86 | |
87 | if (!renderedBus) |
88 | destinationBus->zero(); |
89 | else if (renderedBus != destinationBus) { |
90 | // in-place processing was not possible - so copy |
91 | destinationBus->copyFrom(*renderedBus); |
92 | } |
93 | |
94 | // Process nodes which need a little extra help because they are not connected to anything, but still need to process. |
95 | context().processAutomaticPullNodes(numberOfFrames); |
96 | |
97 | // Let the context take care of any business at the end of each render quantum. |
98 | context().handlePostRenderTasks(); |
99 | |
100 | // Advance current sample-frame. |
101 | m_currentSampleFrame += numberOfFrames; |
102 | |
103 | setIsSilent(destinationBus->isSilent()); |
104 | |
105 | // The reason we are handling mute after the call to setIsSilent() is because the muted state does |
106 | // not affect the audio destination node's effective playing state. |
107 | if (m_muted) |
108 | destinationBus->zero(); |
109 | } |
110 | |
111 | void AudioDestinationNode::isPlayingDidChange() |
112 | { |
113 | updateIsEffectivelyPlayingAudio(); |
114 | } |
115 | |
116 | void AudioDestinationNode::setIsSilent(bool isSilent) |
117 | { |
118 | if (m_isSilent == isSilent) |
119 | return; |
120 | |
121 | m_isSilent = isSilent; |
122 | updateIsEffectivelyPlayingAudio(); |
123 | } |
124 | |
125 | void AudioDestinationNode::updateIsEffectivelyPlayingAudio() |
126 | { |
127 | bool isEffectivelyPlayingAudio = isPlaying() && !m_isSilent; |
128 | if (m_isEffectivelyPlayingAudio == isEffectivelyPlayingAudio) |
129 | return; |
130 | |
131 | m_isEffectivelyPlayingAudio = isEffectivelyPlayingAudio; |
132 | context().isPlayingAudioDidChange(); |
133 | } |
134 | |
135 | } // namespace WebCore |
136 | |
137 | #endif // ENABLE(WEB_AUDIO) |
138 | |