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1 /* | 1 /* |
2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 */ | 27 */ |
28 | 28 |
29 #ifndef Biquad_h | 29 #ifndef Biquad_h |
30 #define Biquad_h | 30 #define Biquad_h |
31 | 31 |
32 #include "platform/PlatformExport.h" | 32 #include "platform/PlatformExport.h" |
33 #include "platform/audio/AudioArray.h" | 33 #include "platform/audio/AudioArray.h" |
34 #include "wtf/Complex.h" | 34 #include <complex> |
35 #include <sys/types.h> | 35 #include <sys/types.h> |
36 | 36 |
37 #if USE(WEBAUDIO_IPP) | 37 #if USE(WEBAUDIO_IPP) |
38 #include <ipps.h> | 38 #include <ipps.h> |
39 #endif // USE(WEBAUDIO_IPP) | 39 #endif // USE(WEBAUDIO_IPP) |
40 | 40 |
41 namespace blink { | 41 namespace blink { |
42 | 42 |
43 // A basic biquad (two-zero / two-pole digital filter) | 43 // A basic biquad (two-zero / two-pole digital filter) |
44 // | 44 // |
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58 void setHighpassParams(double frequency, double resonance); | 58 void setHighpassParams(double frequency, double resonance); |
59 void setBandpassParams(double frequency, double Q); | 59 void setBandpassParams(double frequency, double Q); |
60 void setLowShelfParams(double frequency, double dbGain); | 60 void setLowShelfParams(double frequency, double dbGain); |
61 void setHighShelfParams(double frequency, double dbGain); | 61 void setHighShelfParams(double frequency, double dbGain); |
62 void setPeakingParams(double frequency, double Q, double dbGain); | 62 void setPeakingParams(double frequency, double Q, double dbGain); |
63 void setAllpassParams(double frequency, double Q); | 63 void setAllpassParams(double frequency, double Q); |
64 void setNotchParams(double frequency, double Q); | 64 void setNotchParams(double frequency, double Q); |
65 | 65 |
66 // Set the biquad coefficients given a single zero (other zero will be conju
gate) | 66 // Set the biquad coefficients given a single zero (other zero will be conju
gate) |
67 // and a single pole (other pole will be conjugate) | 67 // and a single pole (other pole will be conjugate) |
68 void setZeroPolePairs(const Complex& zero, const Complex& pole); | 68 void setZeroPolePairs(const std::complex<double>& zero, const std::complex<d
ouble>& pole); |
69 | 69 |
70 // Set the biquad coefficients given a single pole (other pole will be conju
gate) | 70 // Set the biquad coefficients given a single pole (other pole will be conju
gate) |
71 // (The zeroes will be the inverse of the poles) | 71 // (The zeroes will be the inverse of the poles) |
72 void setAllpassPole(const Complex& pole); | 72 void setAllpassPole(const std::complex<double>&); |
73 | 73 |
74 // Resets filter state | 74 // Resets filter state |
75 void reset(); | 75 void reset(); |
76 | 76 |
77 // Filter response at a set of n frequencies. The magnitude and | 77 // Filter response at a set of n frequencies. The magnitude and |
78 // phase response are returned in magResponse and phaseResponse. | 78 // phase response are returned in magResponse and phaseResponse. |
79 // The phase response is in radians. | 79 // The phase response is in radians. |
80 void getFrequencyResponse(int nFrequencies, | 80 void getFrequencyResponse(int nFrequencies, |
81 const float* frequency, | 81 const float* frequency, |
82 float* magResponse, | 82 float* magResponse, |
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109 double m_x1; // input delayed by 1 sample | 109 double m_x1; // input delayed by 1 sample |
110 double m_x2; // input delayed by 2 samples | 110 double m_x2; // input delayed by 2 samples |
111 double m_y1; // output delayed by 1 sample | 111 double m_y1; // output delayed by 1 sample |
112 double m_y2; // output delayed by 2 samples | 112 double m_y2; // output delayed by 2 samples |
113 #endif | 113 #endif |
114 }; | 114 }; |
115 | 115 |
116 } // namespace blink | 116 } // namespace blink |
117 | 117 |
118 #endif // Biquad_h | 118 #endif // Biquad_h |
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