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 "AnalyserNode.h" |
30 | |
31 | #include "AudioNodeInput.h" |
32 | #include "AudioNodeOutput.h" |
33 | #include <wtf/IsoMallocInlines.h> |
34 | |
35 | namespace WebCore { |
36 | |
37 | WTF_MAKE_ISO_ALLOCATED_IMPL(AnalyserNode); |
38 | |
39 | AnalyserNode::AnalyserNode(AudioContext& context, float sampleRate) |
40 | : AudioBasicInspectorNode(context, sampleRate, 2) |
41 | { |
42 | setNodeType(NodeTypeAnalyser); |
43 | |
44 | initialize(); |
45 | } |
46 | |
47 | AnalyserNode::~AnalyserNode() |
48 | { |
49 | uninitialize(); |
50 | } |
51 | |
52 | void AnalyserNode::process(size_t framesToProcess) |
53 | { |
54 | AudioBus* outputBus = output(0)->bus(); |
55 | |
56 | if (!isInitialized() || !input(0)->isConnected()) { |
57 | outputBus->zero(); |
58 | return; |
59 | } |
60 | |
61 | AudioBus* inputBus = input(0)->bus(); |
62 | |
63 | // Give the analyser the audio which is passing through this AudioNode. |
64 | m_analyser.writeInput(inputBus, framesToProcess); |
65 | |
66 | // For in-place processing, our override of pullInputs() will just pass the audio data through unchanged if the channel count matches from input to output |
67 | // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo. |
68 | if (inputBus != outputBus) |
69 | outputBus->copyFrom(*inputBus); |
70 | } |
71 | |
72 | void AnalyserNode::reset() |
73 | { |
74 | m_analyser.reset(); |
75 | } |
76 | |
77 | ExceptionOr<void> AnalyserNode::setFftSize(unsigned size) |
78 | { |
79 | if (!m_analyser.setFftSize(size)) |
80 | return Exception { IndexSizeError }; |
81 | return { }; |
82 | } |
83 | |
84 | ExceptionOr<void> AnalyserNode::setMinDecibels(double k) |
85 | { |
86 | if (k > maxDecibels()) |
87 | return Exception { IndexSizeError }; |
88 | |
89 | m_analyser.setMinDecibels(k); |
90 | return { }; |
91 | } |
92 | |
93 | ExceptionOr<void> AnalyserNode::setMaxDecibels(double k) |
94 | { |
95 | if (k < minDecibels()) |
96 | return Exception { IndexSizeError }; |
97 | |
98 | m_analyser.setMaxDecibels(k); |
99 | return { }; |
100 | } |
101 | |
102 | ExceptionOr<void> AnalyserNode::setSmoothingTimeConstant(double k) |
103 | { |
104 | if (k < 0 || k > 1) |
105 | return Exception { IndexSizeError }; |
106 | |
107 | m_analyser.setSmoothingTimeConstant(k); |
108 | return { }; |
109 | } |
110 | |
111 | } // namespace WebCore |
112 | |
113 | #endif // ENABLE(WEB_AUDIO) |
114 | |