| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2006-2007 Thom Johansen |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ****************************************************************************/ |
| |
| #ifndef _EQ_H |
| #define _EQ_H |
| |
| #include <inttypes.h> |
| |
| /* These depend on the fixed point formats used by the different filter types |
| and need to be changed when they change. |
| */ |
| #define FILTER_BISHELF_SHIFT 5 |
| #define EQ_PEAK_SHIFT 4 |
| #define EQ_SHELF_SHIFT 6 |
| |
| struct eqfilter { |
| int32_t coefs[5]; /* Order is b0, b1, b2, a1, a2 */ |
| int32_t history[2][4]; |
| }; |
| |
| void filter_shelf_coefs(unsigned long cutoff, long A, bool low, int32_t *c); |
| void filter_bishelf_coefs(unsigned long cutoff_low, unsigned long cutoff_high, |
| long A_low, long A_high, long A, int32_t *c); |
| void eq_pk_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c); |
| void eq_ls_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c); |
| void eq_hs_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c); |
| void eq_filter(int32_t **x, struct eqfilter *f, unsigned num, |
| unsigned channels, unsigned shift); |
| |
| #endif |
| |