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#pragma once
26
27#include "AudioBasicProcessorNode.h"
28#include "BiquadProcessor.h"
29
30namespace WebCore {
31
32class AudioParam;
33
34class BiquadFilterNode final : public AudioBasicProcessorNode {
35 WTF_MAKE_ISO_ALLOCATED(BiquadFilterNode);
36public:
37 static Ref<BiquadFilterNode> create(AudioContext& context, float sampleRate)
38 {
39 return adoptRef(*new BiquadFilterNode(context, sampleRate));
40 }
41
42 BiquadFilterType type() const;
43 void setType(BiquadFilterType);
44
45 AudioParam* frequency() { return biquadProcessor()->parameter1(); }
46 AudioParam* q() { return biquadProcessor()->parameter2(); }
47 AudioParam* gain() { return biquadProcessor()->parameter3(); }
48 AudioParam* detune() { return biquadProcessor()->parameter4(); }
49
50 // Get the magnitude and phase response of the filter at the given
51 // set of frequencies (in Hz). The phase response is in radians.
52 void getFrequencyResponse(const RefPtr<Float32Array>& frequencyHz, const RefPtr<Float32Array>& magResponse, const RefPtr<Float32Array>& phaseResponse);
53
54private:
55 BiquadFilterNode(AudioContext&, float sampleRate);
56
57 BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); }
58};
59
60} // namespace WebCore
61