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 "ExceptionCode.h"
34
35namespace WebCore {
36
37AnalyserNode::AnalyserNode(AudioContext* context, float sampleRate)
38    : AudioBasicInspectorNode(context, sampleRate, 2)
39{
40    setNodeType(NodeTypeAnalyser);
41
42    initialize();
43}
44
45AnalyserNode::~AnalyserNode()
46{
47    uninitialize();
48}
49
50void AnalyserNode::process(size_t framesToProcess)
51{
52    AudioBus* outputBus = output(0)->bus();
53
54    if (!isInitialized() || !input(0)->isConnected()) {
55        outputBus->zero();
56        return;
57    }
58
59    AudioBus* inputBus = input(0)->bus();
60
61    // Give the analyser the audio which is passing through this AudioNode.
62    m_analyser.writeInput(inputBus, framesToProcess);
63
64    // 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
65    // (resulting in inputBus == outputBus). Otherwise, do an up-mix to stereo.
66    if (inputBus != outputBus)
67        outputBus->copyFrom(*inputBus);
68}
69
70void AnalyserNode::reset()
71{
72    m_analyser.reset();
73}
74
75void AnalyserNode::setFftSize(unsigned size, ExceptionCode& ec)
76{
77    if (!m_analyser.setFftSize(size))
78        ec = NOT_SUPPORTED_ERR;
79}
80
81} // namespace WebCore
82
83#endif // ENABLE(WEB_AUDIO)
84