36 static void set_coefficient(struct biquad *bq, double b0, double b1, double b2,  in set_coefficient()  argument
40 	bq->b0 = b0 * a0_inv;  in set_coefficient()
41 	bq->b1 = b1 * a0_inv;  in set_coefficient()
42 	bq->b2 = b2 * a0_inv;  in set_coefficient()
43 	bq->a1 = a1 * a0_inv;  in set_coefficient()
44 	bq->a2 = a2 * a0_inv;  in set_coefficient()
47 static void biquad_lowpass(struct biquad *bq, double cutoff, double resonance)  in biquad_lowpass()  argument
57 		set_coefficient(bq, cutoff, 0, 0, 1, 0, 0);  in biquad_lowpass()
78 	set_coefficient(bq, b0, b1, b2, 1, a1, a2);  in biquad_lowpass()
81 static void biquad_highpass(struct biquad *bq, double cutoff, double resonance)  in biquad_highpass()  argument
93 		set_coefficient(bq, 1 - cutoff, 0, 0, 1, 0, 0);  in biquad_highpass()
114 	set_coefficient(bq, b0, b1, b2, 1, a1, a2);  in biquad_highpass()
117 static void biquad_bandpass(struct biquad *bq, double frequency, double Q)  in biquad_bandpass()  argument
132 		set_coefficient(bq, 0, 0, 0, 1, 0, 0);  in biquad_bandpass()
140 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_bandpass()
155 	set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_bandpass()
158 static void biquad_lowshelf(struct biquad *bq, double frequency, double db_gain)  in biquad_lowshelf()  argument
167 		set_coefficient(bq, A * A, 0, 0, 1, 0, 0);  in biquad_lowshelf()
172 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_lowshelf()
191 	set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_lowshelf()
194 static void biquad_highshelf(struct biquad *bq, double frequency,  in biquad_highshelf()  argument
204 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_highshelf()
209 		set_coefficient(bq, A * A, 0, 0, 1, 0, 0);  in biquad_highshelf()
228 	set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_highshelf()
231 static void biquad_peaking(struct biquad *bq, double frequency, double Q,  in biquad_peaking()  argument
244 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_peaking()
252 		set_coefficient(bq, A * A, 0, 0, 1, 0, 0);  in biquad_peaking()
267 	set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_peaking()
270 static void biquad_notch(struct biquad *bq, double frequency, double Q)  in biquad_notch()  argument
280 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_notch()
288 		set_coefficient(bq, 0, 0, 0, 1, 0, 0);  in biquad_notch()
303 	set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_notch()
306 static void biquad_allpass(struct biquad *bq, double frequency, double Q)  in biquad_allpass()  argument
316 		set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_allpass()
325 		set_coefficient(bq, -1, 0, 0, 1, 0, 0);  in biquad_allpass()
340 	set_coefficient(bq, b0, b1, b2, a0, a1, a2);  in biquad_allpass()
343 void biquad_set(struct biquad *bq, enum biquad_type type, double freq, double Q,  in biquad_set()  argument
347 	set_coefficient(bq, 1, 0, 0, 1, 0, 0);  in biquad_set()
348 	bq->x1 = 0;  in biquad_set()
349 	bq->x2 = 0;  in biquad_set()
350 	bq->y1 = 0;  in biquad_set()
351 	bq->y2 = 0;  in biquad_set()
355 		biquad_lowpass(bq, freq, Q);  in biquad_set()
358 		biquad_highpass(bq, freq, Q);  in biquad_set()
361 		biquad_bandpass(bq, freq, Q);  in biquad_set()
364 		biquad_lowshelf(bq, freq, gain);  in biquad_set()
367 		biquad_highshelf(bq, freq, gain);  in biquad_set()
370 		biquad_peaking(bq, freq, Q, gain);  in biquad_set()
373 		biquad_notch(bq, freq, Q);  in biquad_set()
376 		biquad_allpass(bq, freq, Q);  in biquad_set()