[5269] | 1 | //filter_amp.c: |
---|
| 2 | |
---|
| 3 | /* |
---|
| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
---|
| 5 | * |
---|
| 6 | * This file is part of libroardsp a part of RoarAudio, |
---|
| 7 | * a cross-platform sound system for both, home and professional use. |
---|
| 8 | * See README for details. |
---|
| 9 | * |
---|
| 10 | * This file is free software; you can redistribute it and/or modify |
---|
| 11 | * it under the terms of the GNU General Public License version 3 |
---|
| 12 | * as published by the Free Software Foundation. |
---|
| 13 | * |
---|
| 14 | * libroardsp is distributed in the hope that it will be useful, |
---|
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 17 | * GNU General Public License for more details. |
---|
| 18 | * |
---|
| 19 | * You should have received a copy of the GNU General Public License |
---|
| 20 | * along with this software; see the file COPYING. If not, write to |
---|
| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
---|
| 22 | * Boston, MA 02110-1301, USA. |
---|
| 23 | * |
---|
| 24 | */ |
---|
| 25 | |
---|
| 26 | #include "libroardsp.h" |
---|
| 27 | |
---|
| 28 | int roardsp_responsecurve_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
---|
| 29 | struct roardsp_responsecurve * self = roar_mm_malloc(sizeof(struct roardsp_responsecurve)); |
---|
| 30 | |
---|
[5270] | 31 | (void)stream, (void)id; |
---|
| 32 | |
---|
[5269] | 33 | ROAR_DBG("roardsp_responsecurve_init(filter=%p, stream=%p, id=%i) = ?", filter, stream, id); |
---|
| 34 | |
---|
| 35 | if ( self == NULL ) |
---|
| 36 | return -1; |
---|
| 37 | |
---|
| 38 | memset(self, 0, sizeof(struct roardsp_responsecurve)); |
---|
| 39 | |
---|
| 40 | filter->inst = (void*) self; |
---|
| 41 | |
---|
| 42 | roardsp_filter_reset(filter, ROARDSP_RESET_FULL); |
---|
| 43 | |
---|
| 44 | return 0; |
---|
| 45 | } |
---|
| 46 | |
---|
| 47 | int roardsp_responsecurve_uninit(struct roardsp_filter * filter) { |
---|
| 48 | |
---|
| 49 | roar_mm_free(filter->inst); |
---|
| 50 | return 0; |
---|
| 51 | } |
---|
| 52 | |
---|
| 53 | static double __func_pass(double i, double N) { |
---|
[5270] | 54 | (void)N; |
---|
[5269] | 55 | return i; |
---|
| 56 | } |
---|
| 57 | |
---|
| 58 | static double __func_linear(double i, double N) { |
---|
| 59 | return -pow(1. - i, N + 1.) + 1.; |
---|
| 60 | } |
---|
| 61 | |
---|
| 62 | static double __func_ilinear(double i, double N) { |
---|
| 63 | return pow(i, N + 1.); |
---|
| 64 | } |
---|
| 65 | |
---|
| 66 | static double __func_sin(double i, double N) { |
---|
| 67 | return pow(sin(M_PI_2 * i), N); |
---|
| 68 | } |
---|
| 69 | |
---|
| 70 | static double __func_isin(double i, double N) { |
---|
| 71 | return 1. - pow(sin((1. - i) * M_PI_2), N); |
---|
| 72 | } |
---|
| 73 | |
---|
| 74 | static double __func_cos(double i, double N) { |
---|
[5270] | 75 | (void)N; |
---|
[5269] | 76 | return 0.5 - cos(i * M_PI)/2.; |
---|
| 77 | } |
---|
| 78 | |
---|
| 79 | static double __func_icos(double i, double N) { |
---|
[5270] | 80 | (void)N; |
---|
[5269] | 81 | return 2.*i - 0.5 + cos(i * M_PI)/2.; |
---|
| 82 | } |
---|
| 83 | |
---|
| 84 | static inline double _oddify(double x, double N, double (*func)(double, double)) { |
---|
| 85 | if ( x < 0. ) { |
---|
| 86 | return -func(0. - x, N); |
---|
| 87 | } else { |
---|
| 88 | return func(x, N); |
---|
| 89 | } |
---|
| 90 | } |
---|
| 91 | |
---|
| 92 | static inline double _calc(double x, struct roardsp_responsecurve * self, double N) { |
---|
| 93 | double (*func)(double, double) = NULL; |
---|
| 94 | enum roardsp_responsecurve_mode mode; |
---|
| 95 | |
---|
| 96 | if ( x > 0. ) { |
---|
| 97 | mode = self->mode_pos; |
---|
| 98 | } else { |
---|
| 99 | mode = self->mode_neg; |
---|
| 100 | } |
---|
| 101 | |
---|
| 102 | switch (mode) { |
---|
| 103 | case ROARDSP_RESPONSECURVE_MODE_PASS: func = __func_pass; break; |
---|
| 104 | case ROARDSP_RESPONSECURVE_MODE_LIN: func = __func_linear; break; |
---|
| 105 | case ROARDSP_RESPONSECURVE_MODE_ILIN: func = __func_ilinear; break; |
---|
| 106 | case ROARDSP_RESPONSECURVE_MODE_SIN: func = __func_sin; break; |
---|
| 107 | case ROARDSP_RESPONSECURVE_MODE_ISIN: func = __func_isin; break; |
---|
| 108 | case ROARDSP_RESPONSECURVE_MODE_COS: func = __func_cos; break; |
---|
| 109 | case ROARDSP_RESPONSECURVE_MODE_ICOS: func = __func_icos; break; |
---|
| 110 | default: func = __func_linear; break; |
---|
| 111 | } |
---|
| 112 | |
---|
| 113 | return _oddify(x, N, func); |
---|
| 114 | } |
---|
| 115 | |
---|
| 116 | #define _calcX(bits,fact) \ |
---|
| 117 | int roardsp_responsecurve_calc##bits (struct roardsp_filter * filter, void * data, size_t samples) { \ |
---|
| 118 | struct roardsp_responsecurve * self = (struct roardsp_responsecurve *) filter->inst; \ |
---|
| 119 | int##bits##_t * samp = (int##bits##_t *) data; \ |
---|
| 120 | register double s; \ |
---|
| 121 | size_t i; \ |
---|
| 122 | \ |
---|
| 123 | for (i = 0; i < samples; i++) { \ |
---|
| 124 | s = samp[i]; \ |
---|
| 125 | s /= (double)(fact); \ |
---|
| 126 | s = _calc(s, self, self->N); \ |
---|
| 127 | s *= (double)(fact); \ |
---|
| 128 | samp[i] = s; \ |
---|
| 129 | }; \ |
---|
| 130 | \ |
---|
| 131 | return 0; \ |
---|
| 132 | } |
---|
| 133 | |
---|
| 134 | _calcX(8,128.) |
---|
| 135 | _calcX(16,32768.) |
---|
| 136 | _calcX(32,2147483648.) |
---|
| 137 | |
---|
| 138 | int roardsp_responsecurve_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
---|
| 139 | struct roardsp_responsecurve * self = (struct roardsp_responsecurve *) filter->inst; |
---|
| 140 | int32_t old; |
---|
| 141 | |
---|
| 142 | if ( cmd == ROARDSP_FCTL_N ) { |
---|
| 143 | old = self->N; |
---|
| 144 | self->N = *(int32_t*)data; |
---|
| 145 | *(int32_t*)data = old; |
---|
| 146 | } else if ( cmd == ROARDSP_FCTL_MODE ) { |
---|
| 147 | old = self->mode_pos; |
---|
| 148 | self->mode_pos = *(int32_t*)data; |
---|
| 149 | *(int32_t*)data = old; |
---|
| 150 | } else if ( cmd == ROARDSP_FCTL_Q ) { |
---|
| 151 | old = self->mode_neg; |
---|
| 152 | self->mode_neg = *(int32_t*)data; |
---|
| 153 | *(int32_t*)data = old; |
---|
| 154 | } else { |
---|
| 155 | return -1; |
---|
| 156 | } |
---|
| 157 | |
---|
| 158 | |
---|
| 159 | return 0; |
---|
| 160 | } |
---|
| 161 | |
---|
| 162 | int roardsp_responsecurve_reset (struct roardsp_filter * filter, int what) { |
---|
| 163 | struct roardsp_responsecurve * self; |
---|
| 164 | |
---|
| 165 | if ( filter == NULL ) |
---|
| 166 | return -1; |
---|
| 167 | |
---|
| 168 | if ( filter->inst == NULL ) |
---|
| 169 | return -1; |
---|
| 170 | |
---|
| 171 | self = filter->inst; |
---|
| 172 | |
---|
| 173 | switch (what) { |
---|
| 174 | case ROARDSP_RESET_NONE: |
---|
| 175 | case ROARDSP_RESET_STATE: |
---|
| 176 | return 0; |
---|
| 177 | break; |
---|
| 178 | case ROARDSP_RESET_FULL: |
---|
| 179 | self->mode_pos = self->mode_neg = ROARDSP_RESPONSECURVE_MODE_LIN; |
---|
| 180 | self->N = 1; |
---|
| 181 | return 0; |
---|
| 182 | break; |
---|
| 183 | default: |
---|
| 184 | return -1; |
---|
| 185 | } |
---|
| 186 | |
---|
| 187 | return -1; |
---|
| 188 | } |
---|
| 189 | |
---|
| 190 | //ll |
---|