1 | //filter_amp.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
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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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28 | #ifdef ROAR_HAVE_LIBM |
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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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32 | (void)stream, (void)id; |
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33 | |
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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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55 | (void)N; |
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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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76 | (void)N; |
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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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81 | (void)N; |
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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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190 | #endif |
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191 | |
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192 | //ll |
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