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1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2006-2007 Thom Johansen
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21
22#ifndef _EQ_H
23#define _EQ_H
24
25#include <inttypes.h>
26#include <stdbool.h>
27
28/* These depend on the fixed point formats used by the different filter types
29 and need to be changed when they change.
30 */
31#define FILTER_BISHELF_SHIFT 5
32#define EQ_PEAK_SHIFT 4
33#define EQ_SHELF_SHIFT 6
34
35struct eqfilter {
36 int32_t coefs[5]; /* Order is b0, b1, b2, a1, a2 */
37 int32_t history[2][4];
38};
39
40void filter_shelf_coefs(unsigned long cutoff, long A, bool low, int32_t *c);
41void filter_bishelf_coefs(unsigned long cutoff_low, unsigned long cutoff_high,
42 long A_low, long A_high, long A, int32_t *c);
43void eq_pk_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
44void eq_ls_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
45void eq_hs_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
46void eq_filter(int32_t **x, struct eqfilter *f, unsigned num,
47 unsigned channels, unsigned shift);
48
49#endif
50