[5269] | 1 | //filter_amp.c: |
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| 2 | |
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| 3 | /* |
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[5381] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2012 |
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[5269] | 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | */ |
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| 25 | |
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| 26 | #include "libroardsp.h" |
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| 27 | |
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[5362] | 28 | #ifdef ROAR_HAVE_LIBM |
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[5269] | 29 | int roardsp_responsecurve_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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| 30 | struct roardsp_responsecurve * self = roar_mm_malloc(sizeof(struct roardsp_responsecurve)); |
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| 31 | |
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[5270] | 32 | (void)stream, (void)id; |
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| 33 | |
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[5269] | 34 | ROAR_DBG("roardsp_responsecurve_init(filter=%p, stream=%p, id=%i) = ?", filter, stream, id); |
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| 35 | |
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| 36 | if ( self == NULL ) |
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| 37 | return -1; |
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| 38 | |
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| 39 | memset(self, 0, sizeof(struct roardsp_responsecurve)); |
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| 40 | |
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| 41 | filter->inst = (void*) self; |
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| 42 | |
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| 43 | roardsp_filter_reset(filter, ROARDSP_RESET_FULL); |
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| 44 | |
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| 45 | return 0; |
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| 46 | } |
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| 47 | |
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| 48 | int roardsp_responsecurve_uninit(struct roardsp_filter * filter) { |
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| 49 | |
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| 50 | roar_mm_free(filter->inst); |
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| 51 | return 0; |
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| 52 | } |
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| 53 | |
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| 54 | static double __func_pass(double i, double N) { |
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[5270] | 55 | (void)N; |
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[5269] | 56 | return i; |
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| 57 | } |
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| 58 | |
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| 59 | static double __func_linear(double i, double N) { |
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| 60 | return -pow(1. - i, N + 1.) + 1.; |
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| 61 | } |
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| 62 | |
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| 63 | static double __func_ilinear(double i, double N) { |
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| 64 | return pow(i, N + 1.); |
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| 65 | } |
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| 66 | |
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| 67 | static double __func_sin(double i, double N) { |
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| 68 | return pow(sin(M_PI_2 * i), N); |
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| 69 | } |
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| 70 | |
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| 71 | static double __func_isin(double i, double N) { |
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| 72 | return 1. - pow(sin((1. - i) * M_PI_2), N); |
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| 73 | } |
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| 74 | |
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| 75 | static double __func_cos(double i, double N) { |
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[5270] | 76 | (void)N; |
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[5269] | 77 | return 0.5 - cos(i * M_PI)/2.; |
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| 78 | } |
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| 79 | |
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| 80 | static double __func_icos(double i, double N) { |
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[5270] | 81 | (void)N; |
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[5269] | 82 | return 2.*i - 0.5 + cos(i * M_PI)/2.; |
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| 83 | } |
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| 84 | |
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| 85 | static inline double _oddify(double x, double N, double (*func)(double, double)) { |
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| 86 | if ( x < 0. ) { |
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| 87 | return -func(0. - x, N); |
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| 88 | } else { |
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| 89 | return func(x, N); |
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| 90 | } |
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| 91 | } |
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| 92 | |
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| 93 | static inline double _calc(double x, struct roardsp_responsecurve * self, double N) { |
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| 94 | double (*func)(double, double) = NULL; |
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| 95 | enum roardsp_responsecurve_mode mode; |
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| 96 | |
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| 97 | if ( x > 0. ) { |
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| 98 | mode = self->mode_pos; |
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| 99 | } else { |
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| 100 | mode = self->mode_neg; |
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| 101 | } |
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| 102 | |
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| 103 | switch (mode) { |
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| 104 | case ROARDSP_RESPONSECURVE_MODE_PASS: func = __func_pass; break; |
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| 105 | case ROARDSP_RESPONSECURVE_MODE_LIN: func = __func_linear; break; |
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| 106 | case ROARDSP_RESPONSECURVE_MODE_ILIN: func = __func_ilinear; break; |
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| 107 | case ROARDSP_RESPONSECURVE_MODE_SIN: func = __func_sin; break; |
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| 108 | case ROARDSP_RESPONSECURVE_MODE_ISIN: func = __func_isin; break; |
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| 109 | case ROARDSP_RESPONSECURVE_MODE_COS: func = __func_cos; break; |
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| 110 | case ROARDSP_RESPONSECURVE_MODE_ICOS: func = __func_icos; break; |
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| 111 | default: func = __func_linear; break; |
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| 112 | } |
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| 113 | |
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| 114 | return _oddify(x, N, func); |
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| 115 | } |
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| 116 | |
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| 117 | #define _calcX(bits,fact) \ |
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| 118 | int roardsp_responsecurve_calc##bits (struct roardsp_filter * filter, void * data, size_t samples) { \ |
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| 119 | struct roardsp_responsecurve * self = (struct roardsp_responsecurve *) filter->inst; \ |
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| 120 | int##bits##_t * samp = (int##bits##_t *) data; \ |
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| 121 | register double s; \ |
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| 122 | size_t i; \ |
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| 123 | \ |
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| 124 | for (i = 0; i < samples; i++) { \ |
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| 125 | s = samp[i]; \ |
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| 126 | s /= (double)(fact); \ |
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| 127 | s = _calc(s, self, self->N); \ |
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| 128 | s *= (double)(fact); \ |
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| 129 | samp[i] = s; \ |
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| 130 | }; \ |
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| 131 | \ |
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| 132 | return 0; \ |
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| 133 | } |
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| 134 | |
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| 135 | _calcX(8,128.) |
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| 136 | _calcX(16,32768.) |
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| 137 | _calcX(32,2147483648.) |
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| 138 | |
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| 139 | int roardsp_responsecurve_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
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| 140 | struct roardsp_responsecurve * self = (struct roardsp_responsecurve *) filter->inst; |
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| 141 | int32_t old; |
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| 142 | |
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| 143 | if ( cmd == ROARDSP_FCTL_N ) { |
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| 144 | old = self->N; |
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| 145 | self->N = *(int32_t*)data; |
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| 146 | *(int32_t*)data = old; |
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| 147 | } else if ( cmd == ROARDSP_FCTL_MODE ) { |
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| 148 | old = self->mode_pos; |
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| 149 | self->mode_pos = *(int32_t*)data; |
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| 150 | *(int32_t*)data = old; |
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| 151 | } else if ( cmd == ROARDSP_FCTL_Q ) { |
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| 152 | old = self->mode_neg; |
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| 153 | self->mode_neg = *(int32_t*)data; |
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| 154 | *(int32_t*)data = old; |
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| 155 | } else { |
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| 156 | return -1; |
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| 157 | } |
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| 158 | |
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| 159 | |
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| 160 | return 0; |
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| 161 | } |
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| 162 | |
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| 163 | int roardsp_responsecurve_reset (struct roardsp_filter * filter, int what) { |
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| 164 | struct roardsp_responsecurve * self; |
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| 165 | |
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| 166 | if ( filter == NULL ) |
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| 167 | return -1; |
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| 168 | |
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| 169 | if ( filter->inst == NULL ) |
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| 170 | return -1; |
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| 171 | |
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| 172 | self = filter->inst; |
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| 173 | |
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| 174 | switch (what) { |
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| 175 | case ROARDSP_RESET_NONE: |
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| 176 | case ROARDSP_RESET_STATE: |
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| 177 | return 0; |
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| 178 | break; |
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| 179 | case ROARDSP_RESET_FULL: |
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| 180 | self->mode_pos = self->mode_neg = ROARDSP_RESPONSECURVE_MODE_LIN; |
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| 181 | self->N = 1; |
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| 182 | return 0; |
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| 183 | break; |
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| 184 | default: |
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| 185 | return -1; |
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| 186 | } |
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| 187 | |
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| 188 | return -1; |
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| 189 | } |
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[5362] | 190 | #endif |
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[5269] | 191 | |
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| 192 | //ll |
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