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filter-graph: Use biquad from audioconvert
Remove the biquad-implementation in filter-graph and use the one in audioconvert instead.
This commit is contained in:
Jonas Holmberg
parent
e9092d7d2f
commit
0570d1dd00
2 changed files with 4 additions and 377 deletions
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@ -1,374 +0,0 @@
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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Copyright (C) 2010 Google Inc. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE.WEBKIT file.
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*/
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#include <math.h>
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#include "biquad.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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/* S = 1 in Q */
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#define BIQUAD_SHELVING_DEFAULT_Q 0.707106781186548
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static void set_coefficient(struct biquad *bq, double b0, double b1, double b2,
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double a0, double a1, double a2)
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{
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double a0_inv = 1 / a0;
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bq->b0 = (float)(b0 * a0_inv);
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bq->b1 = (float)(b1 * a0_inv);
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bq->b2 = (float)(b2 * a0_inv);
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bq->a1 = (float)(a1 * a0_inv);
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bq->a2 = (float)(a2 * a0_inv);
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}
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static void biquad_lowpass(struct biquad *bq, double cutoff, double resonance)
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{
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/* Limit cutoff to 0 to 1. */
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cutoff = fmax(0.0, fmin(cutoff, 1.0));
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if (cutoff == 1 || cutoff == 0) {
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/* When cutoff is 1, the z-transform is 1.
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* When cutoff is zero, nothing gets through the filter, so set
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* coefficients up correctly.
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*/
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set_coefficient(bq, cutoff, 0, 0, 1, 0, 0);
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return;
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}
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/* Compute biquad coefficients for lowpass filter */
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resonance = fmax(0.0, resonance); /* can't go negative */
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double g = pow(10.0, 0.05 * resonance);
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double d = sqrt((4 - sqrt(16 - 16 / (g * g))) / 2);
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double theta = M_PI * cutoff;
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double sn = 0.5 * d * sin(theta);
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double beta = 0.5 * (1 - sn) / (1 + sn);
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double gamma = (0.5 + beta) * cos(theta);
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double alpha = 0.25 * (0.5 + beta - gamma);
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double b0 = 2 * alpha;
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double b1 = 2 * 2 * alpha;
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double b2 = 2 * alpha;
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double a1 = 2 * -gamma;
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double a2 = 2 * beta;
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set_coefficient(bq, b0, b1, b2, 1, a1, a2);
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}
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static void biquad_highpass(struct biquad *bq, double cutoff, double resonance)
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{
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/* Limit cutoff to 0 to 1. */
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cutoff = fmax(0.0, fmin(cutoff, 1.0));
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if (cutoff == 1 || cutoff == 0) {
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/* When cutoff is one, the z-transform is 0. */
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/* When cutoff is zero, we need to be careful because the above
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* gives a quadratic divided by the same quadratic, with poles
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* and zeros on the unit circle in the same place. When cutoff
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* is zero, the z-transform is 1.
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*/
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set_coefficient(bq, 1 - cutoff, 0, 0, 1, 0, 0);
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return;
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}
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/* Compute biquad coefficients for highpass filter */
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resonance = fmax(0.0, resonance); /* can't go negative */
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double g = pow(10.0, 0.05 * resonance);
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double d = sqrt((4 - sqrt(16 - 16 / (g * g))) / 2);
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double theta = M_PI * cutoff;
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double sn = 0.5 * d * sin(theta);
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double beta = 0.5 * (1 - sn) / (1 + sn);
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double gamma = (0.5 + beta) * cos(theta);
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double alpha = 0.25 * (0.5 + beta + gamma);
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double b0 = 2 * alpha;
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double b1 = 2 * -2 * alpha;
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double b2 = 2 * alpha;
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double a1 = 2 * -gamma;
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double a2 = 2 * beta;
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set_coefficient(bq, b0, b1, b2, 1, a1, a2);
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}
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static void biquad_bandpass(struct biquad *bq, double frequency, double Q)
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{
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/* No negative frequencies allowed. */
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frequency = fmax(0.0, frequency);
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/* Don't let Q go negative, which causes an unstable filter. */
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Q = fmax(0.0, Q);
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if (frequency <= 0 || frequency >= 1) {
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/* When the cutoff is zero, the z-transform approaches 0, if Q
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* > 0. When both Q and cutoff are zero, the z-transform is
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* pretty much undefined. What should we do in this case?
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* For now, just make the filter 0. When the cutoff is 1, the
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* z-transform also approaches 0.
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*/
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set_coefficient(bq, 0, 0, 0, 1, 0, 0);
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return;
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}
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if (Q <= 0) {
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/* When Q = 0, the above formulas have problems. If we
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* look at the z-transform, we can see that the limit
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* as Q->0 is 1, so set the filter that way.
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*/
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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return;
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}
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double w0 = M_PI * frequency;
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double alpha = sin(w0) / (2 * Q);
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double k = cos(w0);
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double b0 = alpha;
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double b1 = 0;
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double b2 = -alpha;
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double a0 = 1 + alpha;
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double a1 = -2 * k;
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double a2 = 1 - alpha;
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set_coefficient(bq, b0, b1, b2, a0, a1, a2);
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}
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static void biquad_lowshelf(struct biquad *bq, double frequency, double Q,
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double db_gain)
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{
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/* Clip frequencies to between 0 and 1, inclusive. */
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frequency = fmax(0.0, fmin(frequency, 1.0));
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double A = pow(10.0, db_gain / 40);
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if (frequency == 1) {
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/* The z-transform is a constant gain. */
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set_coefficient(bq, A * A, 0, 0, 1, 0, 0);
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return;
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}
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if (frequency <= 0) {
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/* When frequency is 0, the z-transform is 1. */
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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return;
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}
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/* Set Q to an equivalent value to S = 1 if not specified */
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if (Q <= 0)
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Q = BIQUAD_SHELVING_DEFAULT_Q;
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double w0 = M_PI * frequency;
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double alpha = sin(w0) / (2 * Q);
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double k = cos(w0);
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double k2 = 2 * sqrt(A) * alpha;
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double a_plus_one = A + 1;
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double a_minus_one = A - 1;
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double b0 = A * (a_plus_one - a_minus_one * k + k2);
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double b1 = 2 * A * (a_minus_one - a_plus_one * k);
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double b2 = A * (a_plus_one - a_minus_one * k - k2);
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double a0 = a_plus_one + a_minus_one * k + k2;
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double a1 = -2 * (a_minus_one + a_plus_one * k);
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double a2 = a_plus_one + a_minus_one * k - k2;
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set_coefficient(bq, b0, b1, b2, a0, a1, a2);
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}
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static void biquad_highshelf(struct biquad *bq, double frequency, double Q,
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double db_gain)
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{
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/* Clip frequencies to between 0 and 1, inclusive. */
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frequency = fmax(0.0, fmin(frequency, 1.0));
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double A = pow(10.0, db_gain / 40);
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if (frequency == 1) {
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/* The z-transform is 1. */
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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return;
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}
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if (frequency <= 0) {
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/* When frequency = 0, the filter is just a gain, A^2. */
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set_coefficient(bq, A * A, 0, 0, 1, 0, 0);
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return;
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}
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/* Set Q to an equivalent value to S = 1 if not specified */
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if (Q <= 0)
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Q = BIQUAD_SHELVING_DEFAULT_Q;
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double w0 = M_PI * frequency;
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double alpha = sin(w0) / (2 * Q);
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double k = cos(w0);
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double k2 = 2 * sqrt(A) * alpha;
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double a_plus_one = A + 1;
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double a_minus_one = A - 1;
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double b0 = A * (a_plus_one + a_minus_one * k + k2);
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double b1 = -2 * A * (a_minus_one + a_plus_one * k);
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double b2 = A * (a_plus_one + a_minus_one * k - k2);
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double a0 = a_plus_one - a_minus_one * k + k2;
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double a1 = 2 * (a_minus_one - a_plus_one * k);
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double a2 = a_plus_one - a_minus_one * k - k2;
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set_coefficient(bq, b0, b1, b2, a0, a1, a2);
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}
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static void biquad_peaking(struct biquad *bq, double frequency, double Q,
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double db_gain)
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{
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/* Clip frequencies to between 0 and 1, inclusive. */
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frequency = fmax(0.0, fmin(frequency, 1.0));
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/* Don't let Q go negative, which causes an unstable filter. */
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Q = fmax(0.0, Q);
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double A = pow(10.0, db_gain / 40);
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if (frequency <= 0 || frequency >= 1) {
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/* When frequency is 0 or 1, the z-transform is 1. */
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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return;
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}
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if (Q <= 0) {
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/* When Q = 0, the above formulas have problems. If we
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* look at the z-transform, we can see that the limit
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* as Q->0 is A^2, so set the filter that way.
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*/
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set_coefficient(bq, A * A, 0, 0, 1, 0, 0);
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return;
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}
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double w0 = M_PI * frequency;
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double alpha = sin(w0) / (2 * Q);
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double k = cos(w0);
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double b0 = 1 + alpha * A;
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double b1 = -2 * k;
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double b2 = 1 - alpha * A;
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double a0 = 1 + alpha / A;
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double a1 = -2 * k;
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double a2 = 1 - alpha / A;
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set_coefficient(bq, b0, b1, b2, a0, a1, a2);
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}
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static void biquad_notch(struct biquad *bq, double frequency, double Q)
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{
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/* Clip frequencies to between 0 and 1, inclusive. */
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frequency = fmax(0.0, fmin(frequency, 1.0));
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/* Don't let Q go negative, which causes an unstable filter. */
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Q = fmax(0.0, Q);
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if (frequency <= 0 || frequency >= 1) {
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/* When frequency is 0 or 1, the z-transform is 1. */
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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return;
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}
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if (Q <= 0) {
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/* When Q = 0, the above formulas have problems. If we
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* look at the z-transform, we can see that the limit
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* as Q->0 is 0, so set the filter that way.
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*/
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set_coefficient(bq, 0, 0, 0, 1, 0, 0);
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return;
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}
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double w0 = M_PI * frequency;
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double alpha = sin(w0) / (2 * Q);
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double k = cos(w0);
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double b0 = 1;
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double b1 = -2 * k;
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double b2 = 1;
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double a0 = 1 + alpha;
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double a1 = -2 * k;
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double a2 = 1 - alpha;
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set_coefficient(bq, b0, b1, b2, a0, a1, a2);
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}
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static void biquad_allpass(struct biquad *bq, double frequency, double Q)
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{
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/* Clip frequencies to between 0 and 1, inclusive. */
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frequency = fmax(0.0, fmin(frequency, 1.0));
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/* Don't let Q go negative, which causes an unstable filter. */
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Q = fmax(0.0, Q);
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if (frequency <= 0 || frequency >= 1) {
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/* When frequency is 0 or 1, the z-transform is 1. */
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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return;
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}
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if (Q <= 0) {
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/* When Q = 0, the above formulas have problems. If we
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* look at the z-transform, we can see that the limit
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* as Q->0 is -1, so set the filter that way.
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*/
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set_coefficient(bq, -1, 0, 0, 1, 0, 0);
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return;
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}
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double w0 = M_PI * frequency;
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double alpha = sin(w0) / (2 * Q);
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double k = cos(w0);
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double b0 = 1 - alpha;
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double b1 = -2 * k;
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double b2 = 1 + alpha;
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double a0 = 1 + alpha;
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double a1 = -2 * k;
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double a2 = 1 - alpha;
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set_coefficient(bq, b0, b1, b2, a0, a1, a2);
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}
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void biquad_set(struct biquad *bq, enum biquad_type type, double freq, double Q,
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double gain)
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{
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/* Clear history values. */
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bq->type = type;
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bq->x1 = 0;
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bq->x2 = 0;
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switch (type) {
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case BQ_LOWPASS:
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biquad_lowpass(bq, freq, Q);
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break;
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case BQ_HIGHPASS:
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biquad_highpass(bq, freq, Q);
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break;
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case BQ_BANDPASS:
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biquad_bandpass(bq, freq, Q);
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break;
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case BQ_LOWSHELF:
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biquad_lowshelf(bq, freq, Q, gain);
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break;
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case BQ_HIGHSHELF:
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biquad_highshelf(bq, freq, Q, gain);
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break;
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case BQ_PEAKING:
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biquad_peaking(bq, freq, Q, gain);
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break;
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case BQ_NOTCH:
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biquad_notch(bq, freq, Q);
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break;
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case BQ_ALLPASS:
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biquad_allpass(bq, freq, Q);
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break;
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case BQ_NONE:
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case BQ_RAW:
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/* Default is an identity filter. */
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set_coefficient(bq, 1, 0, 0, 1, 0, 0);
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break;
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}
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}
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@ -52,12 +52,12 @@ filter_graph_c = static_library('filter_graph_c',
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simd_dependencies += filter_graph_c
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spa_filter_graph = shared_library('spa-filter-graph',
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['biquad.c',
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'filter-graph.c' ],
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['filter-graph.c' ],
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include_directories : [configinc],
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dependencies : [ spa_dep, sndfile_dep, plugin_dependencies, mathlib ],
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install : true,
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install_dir : spa_plugindir / 'filter-graph',
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objects : audioconvert_c.extract_objects('biquad.c'),
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link_with: simd_dependencies
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)
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@ -72,7 +72,8 @@ spa_filter_graph_plugin_builtin = shared_library('spa-filter-graph-plugin-builti
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include_directories : [configinc],
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install : true,
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install_dir : spa_plugindir / 'filter-graph',
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dependencies : [ filter_graph_dependencies ]
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dependencies : [ filter_graph_dependencies ],
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objects : audioconvert_c.extract_objects('biquad.c')
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)
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spa_filter_graph_plugin_ladspa = shared_library('spa-filter-graph-plugin-ladspa',
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