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 | |
30 | namespace WebCore { |
31 | |
32 | class AudioParam; |
33 | |
34 | class BiquadFilterNode final : public AudioBasicProcessorNode { |
35 | WTF_MAKE_ISO_ALLOCATED(BiquadFilterNode); |
36 | public: |
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 | |
54 | private: |
55 | BiquadFilterNode(AudioContext&, float sampleRate); |
56 | |
57 | BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); } |
58 | }; |
59 | |
60 | } // namespace WebCore |
61 | |