1/*
2 * Copyright (C) 2011, 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#ifndef BiquadFilterNode_h
26#define BiquadFilterNode_h
27
28#include "modules/webaudio/AudioBasicProcessorNode.h"
29#include "modules/webaudio/BiquadProcessor.h"
30
31namespace WebCore {
32
33class AudioParam;
34
35class BiquadFilterNode : public AudioBasicProcessorNode {
36public:
37    // These must be defined as in the .idl file and must match those in the BiquadProcessor class.
38    enum {
39        LOWPASS = 0,
40        HIGHPASS = 1,
41        BANDPASS = 2,
42        LOWSHELF = 3,
43        HIGHSHELF = 4,
44        PEAKING = 5,
45        NOTCH = 6,
46        ALLPASS = 7
47    };
48
49    static PassRefPtr<BiquadFilterNode> create(AudioContext* context, float sampleRate)
50    {
51        return adoptRef(new BiquadFilterNode(context, sampleRate));
52    }
53
54    String type() const;
55    bool setType(unsigned); // Returns true on success.
56    void setType(const String&);
57
58    AudioParam* frequency() { return biquadProcessor()->parameter1(); }
59    AudioParam* q() { return biquadProcessor()->parameter2(); }
60    AudioParam* gain() { return biquadProcessor()->parameter3(); }
61    AudioParam* detune() { return biquadProcessor()->parameter4(); }
62
63    // Get the magnitude and phase response of the filter at the given
64    // set of frequencies (in Hz). The phase response is in radians.
65    void getFrequencyResponse(const Float32Array* frequencyHz,
66                              Float32Array* magResponse,
67                              Float32Array* phaseResponse);
68
69private:
70    BiquadFilterNode(AudioContext*, float sampleRate);
71
72    BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); }
73};
74
75} // namespace WebCore
76
77#endif // BiquadFilterNode_h
78