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
35namespace WebCore {
36
37WTF_MAKE_ISO_ALLOCATED_IMPL(AnalyserNode);
38
39AnalyserNode::AnalyserNode(AudioContext& context, float sampleRate)
40 : AudioBasicInspectorNode(context, sampleRate, 2)
41{
42 setNodeType(NodeTypeAnalyser);
43
44 initialize();
45}
46
47AnalyserNode::~AnalyserNode()
48{
49 uninitialize();
50}
51
52void 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
72void AnalyserNode::reset()
73{
74 m_analyser.reset();
75}
76
77ExceptionOr<void> AnalyserNode::setFftSize(unsigned size)
78{
79 if (!m_analyser.setFftSize(size))
80 return Exception { IndexSizeError };
81 return { };
82}
83
84ExceptionOr<void> AnalyserNode::setMinDecibels(double k)
85{
86 if (k > maxDecibels())
87 return Exception { IndexSizeError };
88
89 m_analyser.setMinDecibels(k);
90 return { };
91}
92
93ExceptionOr<void> AnalyserNode::setMaxDecibels(double k)
94{
95 if (k < minDecibels())
96 return Exception { IndexSizeError };
97
98 m_analyser.setMaxDecibels(k);
99 return { };
100}
101
102ExceptionOr<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