third_party/WebKit/Source/platform/audio/Biquad.h - Issue 2919503002: Revert of Compute tail time from Biquad coefficients

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Issue 2919503002: Revert of Compute tail time from Biquad coefficients (Closed)

Patch Set: 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

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

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

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

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

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

85 float* mag_response,	78 float* mag_response,

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

87	80

88 private:	81 private:

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

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123 // Filter memory	116 // Filter memory

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

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

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

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

128 };	121 };

129	122

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

131	124

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

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