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78 lines
2.3 KiB
78 lines
2.3 KiB
/* libSoX Biquad filter common definitions (c) 2006-7 robs@users.sourceforge.net
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef biquad_included
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#define biquad_included
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#define LSX_EFF_ALIAS
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#include "sox_i.h"
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typedef enum {
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filter_LPF,
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filter_HPF,
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filter_BPF_CSG,
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filter_BPF,
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filter_notch,
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filter_APF,
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filter_peakingEQ,
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filter_lowShelf,
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filter_highShelf,
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filter_LPF_1,
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filter_HPF_1,
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filter_BPF_SPK,
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filter_BPF_SPK_N,
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filter_AP1,
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filter_AP2,
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filter_deemph,
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filter_riaa
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} filter_t;
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typedef enum {
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width_bw_Hz,
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width_bw_kHz,
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/* The old, non-RBJ, non-freq-warped band-pass/reject response;
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* leaving here for now just in case anybody misses it: */
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width_bw_old,
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width_bw_oct,
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width_Q,
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width_slope
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} width_t;
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/* Private data for the biquad filter effects */
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typedef struct {
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double gain; /* For EQ filters */
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double fc; /* Centre/corner/cutoff frequency */
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double width; /* Filter width; interpreted as per width_type */
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width_t width_type;
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filter_t filter_type;
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double b0, b1, b2; /* Filter coefficients */
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double a0, a1, a2; /* Filter coefficients */
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sox_sample_t i1, i2; /* Filter memory */
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double o1, o2; /* Filter memory */
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} biquad_t;
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int lsx_biquad_getopts(sox_effect_t * effp, int n, char **argv,
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int min_args, int max_args, int fc_pos, int width_pos, int gain_pos,
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char const * allowed_width_types, filter_t filter_type);
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int lsx_biquad_start(sox_effect_t * effp);
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int lsx_biquad_flow(sox_effect_t * effp, const sox_sample_t *ibuf, sox_sample_t *obuf,
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size_t *isamp, size_t *osamp);
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#endif
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