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 "modules/webaudio/AnalyserNode.h"
30
31#include "bindings/core/v8/ExceptionMessages.h"
32#include "bindings/core/v8/ExceptionState.h"
33#include "core/dom/ExceptionCode.h"
34#include "modules/webaudio/AudioNodeInput.h"
35#include "modules/webaudio/AudioNodeOutput.h"
36
37namespace blink {
38
39AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
40    : AudioBasicInspectorNode(context, sampleRate, 2)
41{
42    setNodeType(NodeTypeAnalyser);
43    initialize();
44}
45
46AnalyserNode::~AnalyserNode()
47{
48    ASSERT(!isInitialized());
49}
50
51void AnalyserNode::dispose()
52{
53    uninitialize();
54    AudioBasicInspectorNode::dispose();
55}
56
57void AnalyserNode::process(size_t framesToProcess)
58{
59    AudioBus* outputBus = output(0)->bus();
60
61    if (!isInitialized() || !input(0)->isConnected()) {
62        outputBus->zero();
63        return;
64    }
65
66    AudioBus* inputBus = input(0)->bus();
67
68    // Give the analyser the audio which is passing through this AudioNode.
69    m_analyser.writeInput(inputBus, framesToProcess);
70
71    // 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
72    // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
73    if (inputBus != outputBus)
74        outputBus->copyFrom(*inputBus);
75}
76
77void AnalyserNode::setFftSize(unsigned size, ExceptionState& exceptionState)
78{
79    if (!m_analyser.setFftSize(size)) {
80        exceptionState.throwDOMException(
81            IndexSizeError,
82            (size < RealtimeAnalyser::MinFFTSize || size > RealtimeAnalyser::MaxFFTSize) ?
83                ExceptionMessages::indexOutsideRange("FFT size", size, RealtimeAnalyser::MinFFTSize, ExceptionMessages::InclusiveBound, RealtimeAnalyser::MaxFFTSize, ExceptionMessages::InclusiveBound)
84                : ("The value provided (" + String::number(size) + ") is not a power of two."));
85    }
86}
87
88void AnalyserNode::setMinDecibels(double k, ExceptionState& exceptionState)
89{
90    if (k < maxDecibels()) {
91        m_analyser.setMinDecibels(k);
92    } else {
93        exceptionState.throwDOMException(
94            IndexSizeError,
95            ExceptionMessages::indexExceedsMaximumBound("minDecibels", k, maxDecibels()));
96    }
97}
98
99void AnalyserNode::setMaxDecibels(double k, ExceptionState& exceptionState)
100{
101    if (k > minDecibels()) {
102        m_analyser.setMaxDecibels(k);
103    } else {
104        exceptionState.throwDOMException(
105            IndexSizeError,
106            ExceptionMessages::indexExceedsMinimumBound("maxDecibels", k, minDecibels()));
107    }
108}
109
110void AnalyserNode::setSmoothingTimeConstant(double k, ExceptionState& exceptionState)
111{
112    if (k >= 0 && k <= 1) {
113        m_analyser.setSmoothingTimeConstant(k);
114    } else {
115        exceptionState.throwDOMException(
116            IndexSizeError,
117            ExceptionMessages::indexOutsideRange("smoothing value", k, 0.0, ExceptionMessages::InclusiveBound, 1.0, ExceptionMessages::InclusiveBound));
118    }
119}
120
121} // namespace blink
122
123#endif // ENABLE(WEB_AUDIO)
124