third_party/WebKit/Source/platform/audio/Biquad.h - Issue 2862373002: Compute tail time from Biquad coefficients

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Issue 2862373002: Compute tail time from Biquad coefficients (Closed)

Patch Set: Initialize tail_time_ in constructor Created 3 years, 6 months ago

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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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63 void SetBandpassParams(int, double frequency, double q);	63 void SetBandpassParams(int, double frequency, double q);

64 void SetLowShelfParams(int, double frequency, double db_gain);	64 void SetLowShelfParams(int, double frequency, double db_gain);

65 void SetHighShelfParams(int, double frequency, double db_gain);	65 void SetHighShelfParams(int, double frequency, double db_gain);

66 void SetPeakingParams(int, double frequency, double q, double db_gain);	66 void SetPeakingParams(int, double frequency, double q, double db_gain);

67 void SetAllpassParams(int, double frequency, double q);	67 void SetAllpassParams(int, double frequency, double q);

68 void SetNotchParams(int, double frequency, double q);	68 void SetNotchParams(int, double frequency, double q);

69	69

70 // Resets filter state	70 // Resets filter state

71 void Reset();	71 void Reset();

72	72

	73 // Compute tail frame based on the filter coefficents at index

	74 // \|coef_index\|. The tail frame is the frame number where the

	75 // impulse response of the filter falls below a threshold value.

	76 // The maximum allowed frame value is given by \|max_frame\|. This

	77 // limits how much work is done in computing the frame numer.

	78 double TailFrame(int coef_index, double max_frame);

	79

73 // Filter response at a set of n frequencies. The magnitude and	80 // Filter response at a set of n frequencies. The magnitude and

74 // phase response are returned in magResponse and phaseResponse.	81 // phase response are returned in magResponse and phaseResponse.

75 // The phase response is in radians.	82 // The phase response is in radians.

76 void GetFrequencyResponse(int n_frequencies,	83 void GetFrequencyResponse(int n_frequencies,

77 const float* frequency,	84 const float* frequency,

78 float* mag_response,	85 float* mag_response,

79 float* phase_response);	86 float* phase_response);

80	87

81 private:	88 private:

82 void SetNormalizedCoefficients(int,	89 void SetNormalizedCoefficients(int,

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116 // Filter memory	123 // Filter memory

117 double x1_; // input delayed by 1 sample	124 double x1_; // input delayed by 1 sample

118 double x2_; // input delayed by 2 samples	125 double x2_; // input delayed by 2 samples

119 double y1_; // output delayed by 1 sample	126 double y1_; // output delayed by 1 sample

120 double y2_; // output delayed by 2 samples	127 double y2_; // output delayed by 2 samples

121 };	128 };

122	129

123 } // namespace blink	130 } // namespace blink

124	131

125 #endif // Biquad_h	132 #endif // Biquad_h

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