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da339c286f
This is an autotools leftover, with meson we're always guaranteed to have the config.h file.
56 lines
1.1 KiB
C
56 lines
1.1 KiB
C
/* 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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#include <config.h>
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#include "crossover.h"
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void lr4_set(struct lr4 *lr4, enum biquad_type type, float freq)
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{
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biquad_set(&lr4->bq, type, freq);
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lr4->x1 = 0;
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lr4->x2 = 0;
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lr4->y1 = 0;
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lr4->y2 = 0;
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lr4->z1 = 0;
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lr4->z2 = 0;
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}
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void lr4_process(struct lr4 *lr4, float *data, int samples)
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{
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float lx1 = lr4->x1;
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float lx2 = lr4->x2;
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float ly1 = lr4->y1;
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float ly2 = lr4->y2;
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float lz1 = lr4->z1;
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float lz2 = lr4->z2;
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float lb0 = lr4->bq.b0;
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float lb1 = lr4->bq.b1;
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float lb2 = lr4->bq.b2;
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float la1 = lr4->bq.a1;
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float la2 = lr4->bq.a2;
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int i;
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for (i = 0; i < samples; i++) {
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float x, y, z;
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x = data[i];
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y = lb0*x + lb1*lx1 + lb2*lx2 - la1*ly1 - la2*ly2;
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z = lb0*y + lb1*ly1 + lb2*ly2 - la1*lz1 - la2*lz2;
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lx2 = lx1;
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lx1 = x;
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ly2 = ly1;
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ly1 = y;
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lz2 = lz1;
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lz1 = z;
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data[i] = z;
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}
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lr4->x1 = lx1;
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lr4->x2 = lx2;
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lr4->y1 = ly1;
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lr4->y2 = ly2;
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lr4->z1 = lz1;
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lr4->z2 = lz2;
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}
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