8e6e290a95
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12674 a1c6a512-1295-4272-9138-f99709370657
47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006-2007 Thom Johansen
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef _EQ_H
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#define _EQ_H
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#include <inttypes.h>
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/* These depend on the fixed point formats used by the different filter types
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and need to be changed when they change.
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*/
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#define FILTER_BISHELF_SHIFT 5
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#define EQ_PEAK_SHIFT 4
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#define EQ_SHELF_SHIFT 6
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struct eqfilter {
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int32_t coefs[5]; /* Order is b0, b1, b2, a1, a2 */
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int32_t history[2][4];
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};
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void filter_shelf_coefs(unsigned long cutoff, long A, bool low, int32_t *c);
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void filter_bishelf_coefs(unsigned long cutoff_low, unsigned long cutoff_high,
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long A_low, long A_high, long A, int32_t *c);
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void eq_pk_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
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void eq_ls_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
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void eq_hs_coefs(unsigned long cutoff, unsigned long Q, long db, int32_t *c);
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void eq_filter(int32_t **x, struct eqfilter *f, unsigned num,
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unsigned channels, unsigned shift);
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#endif
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