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 "AudioBasicProcessorNode.h" |
30 | |
31 | #include "AudioBus.h" |
32 | #include "AudioContext.h" |
33 | #include "AudioNodeInput.h" |
34 | #include "AudioNodeOutput.h" |
35 | #include "AudioProcessor.h" |
36 | #include <wtf/IsoMallocInlines.h> |
37 | |
38 | namespace WebCore { |
39 | |
40 | WTF_MAKE_ISO_ALLOCATED_IMPL(AudioBasicProcessorNode); |
41 | |
42 | AudioBasicProcessorNode::AudioBasicProcessorNode(AudioContext& context, float sampleRate) |
43 | : AudioNode(context, sampleRate) |
44 | { |
45 | addInput(std::make_unique<AudioNodeInput>(this)); |
46 | addOutput(std::make_unique<AudioNodeOutput>(this, 1)); |
47 | |
48 | // The subclass must create m_processor. |
49 | } |
50 | |
51 | void AudioBasicProcessorNode::initialize() |
52 | { |
53 | if (isInitialized()) |
54 | return; |
55 | |
56 | ASSERT(processor()); |
57 | processor()->initialize(); |
58 | |
59 | AudioNode::initialize(); |
60 | } |
61 | |
62 | void AudioBasicProcessorNode::uninitialize() |
63 | { |
64 | if (!isInitialized()) |
65 | return; |
66 | |
67 | ASSERT(processor()); |
68 | processor()->uninitialize(); |
69 | |
70 | AudioNode::uninitialize(); |
71 | } |
72 | |
73 | void AudioBasicProcessorNode::process(size_t framesToProcess) |
74 | { |
75 | AudioBus* destinationBus = output(0)->bus(); |
76 | |
77 | if (!isInitialized() || !processor() || processor()->numberOfChannels() != numberOfChannels()) |
78 | destinationBus->zero(); |
79 | else { |
80 | AudioBus* sourceBus = input(0)->bus(); |
81 | |
82 | // FIXME: if we take "tail time" into account, then we can avoid calling processor()->process() once the tail dies down. |
83 | if (!input(0)->isConnected()) |
84 | sourceBus->zero(); |
85 | |
86 | processor()->process(sourceBus, destinationBus, framesToProcess); |
87 | } |
88 | } |
89 | |
90 | // Nice optimization in the very common case allowing for "in-place" processing |
91 | void AudioBasicProcessorNode::pullInputs(size_t framesToProcess) |
92 | { |
93 | // Render input stream - suggest to the input to render directly into output bus for in-place processing in process() if possible. |
94 | input(0)->pull(output(0)->bus(), framesToProcess); |
95 | } |
96 | |
97 | void AudioBasicProcessorNode::reset() |
98 | { |
99 | if (processor()) |
100 | processor()->reset(); |
101 | } |
102 | |
103 | // As soon as we know the channel count of our input, we can lazily initialize. |
104 | // Sometimes this may be called more than once with different channel counts, in which case we must safely |
105 | // uninitialize and then re-initialize with the new channel count. |
106 | void AudioBasicProcessorNode::checkNumberOfChannelsForInput(AudioNodeInput* input) |
107 | { |
108 | ASSERT(context().isAudioThread() && context().isGraphOwner()); |
109 | |
110 | ASSERT(input == this->input(0)); |
111 | if (input != this->input(0)) |
112 | return; |
113 | |
114 | ASSERT(processor()); |
115 | if (!processor()) |
116 | return; |
117 | |
118 | unsigned numberOfChannels = input->numberOfChannels(); |
119 | |
120 | if (isInitialized() && numberOfChannels != output(0)->numberOfChannels()) { |
121 | // We're already initialized but the channel count has changed. |
122 | uninitialize(); |
123 | } |
124 | |
125 | if (!isInitialized()) { |
126 | // This will propagate the channel count to any nodes connected further down the chain... |
127 | output(0)->setNumberOfChannels(numberOfChannels); |
128 | |
129 | // Re-initialize the processor with the new channel count. |
130 | processor()->setNumberOfChannels(numberOfChannels); |
131 | initialize(); |
132 | } |
133 | |
134 | AudioNode::checkNumberOfChannelsForInput(input); |
135 | } |
136 | |
137 | unsigned AudioBasicProcessorNode::numberOfChannels() |
138 | { |
139 | return output(0)->numberOfChannels(); |
140 | } |
141 | |
142 | double AudioBasicProcessorNode::tailTime() const |
143 | { |
144 | return m_processor->tailTime(); |
145 | } |
146 | |
147 | double AudioBasicProcessorNode::latencyTime() const |
148 | { |
149 | return m_processor->latencyTime(); |
150 | } |
151 | |
152 | } // namespace WebCore |
153 | |
154 | #endif // ENABLE(WEB_AUDIO) |
155 | |