30 static void set_coefficient(struct biquad *bq, double b0, double b1, double b2,  in set_coefficient()  argument
34 	bq->b0 = b0 * a0_inv;  in set_coefficient()
35 	bq->b1 = b1 * a0_inv;  in set_coefficient()
36 	bq->b2 = b2 * a0_inv;  in set_coefficient()
37 	bq->a1 = a1 * a0_inv;  in set_coefficient()
38 	bq->a2 = a2 * a0_inv;  in set_coefficient()
41 static void biquad_lowpass(struct biquad *bq, double cutoff, double resonance)  in biquad_lowpass()  argument
48 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_lowpass()
67 		set_coefficient(bq, b0, b1, b2, 1, a1, a2);  in biquad_lowpass()
72 		set_coefficient(bq, 0, 0, 0, 1, 0, 0);  in biquad_lowpass()
76 static void biquad_highpass(struct biquad *bq, double cutoff, double resonance)  in biquad_highpass()  argument
83 		set_coefficient(bq, 0, 0, 0, 1, 0, 0);  in biquad_highpass()
102 		set_coefficient(bq, b0, b1, b2, 1, a1, a2);  in biquad_highpass()
109 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_highpass()
113 static void biquad_bandpass(struct biquad *bq, double frequency, double Q)  in biquad_bandpass()  argument
134 			set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_bandpass()
140 			set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_bandpass()
149 		set_coefficient(bq, 0, 0, 0, 1, 0, 0);  in biquad_bandpass()
153 static void biquad_lowshelf(struct biquad *bq, double frequency, double db_gain)  in biquad_lowshelf()  argument
162 		set_coefficient(bq, A * A, 0, 0, 1, 0, 0);  in biquad_lowshelf()
180 		set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_lowshelf()
183 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_lowshelf()
187 static void biquad_highshelf(struct biquad *bq, double frequency,  in biquad_highshelf()  argument
197 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_highshelf()
215 		set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_highshelf()
218 		set_coefficient(bq, A * A, 0, 0, 1, 0, 0);  in biquad_highshelf()
222 static void biquad_peaking(struct biquad *bq, double frequency, double Q,  in biquad_peaking()  argument
246 			set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_peaking()
252 			set_coefficient(bq, A * A, 0, 0, 1, 0, 0);  in biquad_peaking()
256 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_peaking()
260 static void biquad_notch(struct biquad *bq, double frequency, double Q)  in biquad_notch()  argument
281 			set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_notch()
287 			set_coefficient(bq, 0, 0, 0, 1, 0, 0);  in biquad_notch()
291 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_notch()
295 static void biquad_allpass(struct biquad *bq, double frequency, double Q)  in biquad_allpass()  argument
316 			set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_allpass()
322 			set_coefficient(bq, -1, 0, 0, 1, 0, 0);  in biquad_allpass()
326 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_allpass()
330 void biquad_set(struct biquad *bq, enum biquad_type type, double freq, double Q,  in biquad_set()  argument
334 	set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_set()
335 	bq->x1 = 0;  in biquad_set()
336 	bq->x2 = 0;  in biquad_set()
337 	bq->y1 = 0;  in biquad_set()
338 	bq->y2 = 0;  in biquad_set()
342 		biquad_lowpass(bq, freq, Q);  in biquad_set()
345 		biquad_highpass(bq, freq, Q);  in biquad_set()
348 		biquad_bandpass(bq, freq, Q);  in biquad_set()
351 		biquad_lowshelf(bq, freq, gain);  in biquad_set()
354 		biquad_highshelf(bq, freq, gain);  in biquad_set()
357 		biquad_peaking(bq, freq, Q, gain);  in biquad_set()
360 		biquad_notch(bq, freq, Q);  in biquad_set()
363 		biquad_allpass(bq, freq, Q);  in biquad_set()