forked from len0rd/rockbox
2acc0ac542
later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
49 lines
1.9 KiB
C
49 lines
1.9 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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
|
|
|