1 | //filter_clip.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2014 |
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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 | int roardsp_clip_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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29 | (void)stream, (void)id; |
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30 | |
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31 | if ( (filter->inst = roar_mm_malloc(sizeof(struct roardsp_clip))) == NULL ) |
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32 | return -1; |
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33 | |
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34 | return roardsp_filter_reset(filter, ROARDSP_RESET_FULL); |
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35 | } |
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36 | |
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37 | int roardsp_clip_uninit(struct roardsp_filter * filter) { |
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38 | roar_mm_free(filter->inst); |
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39 | return 0; |
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40 | } |
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41 | |
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42 | #define _clipX(bits) \ |
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43 | static inline int##bits##_t _clip##bits (int##bits##_t s, struct roardsp_clip * self) { \ |
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44 | switch (self->mode) { \ |
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45 | case ROARDSP_CLIP_MODE_LIMIT: \ |
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46 | return s > 0 ? self->limit : -self->limit; \ |
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47 | break; \ |
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48 | case ROARDSP_CLIP_MODE_ZERO: \ |
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49 | return 0; \ |
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50 | break; \ |
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51 | case ROARDSP_CLIP_MODE_WARP: \ |
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52 | if ( s > 0 ) { \ |
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53 | return s - 2*self->limit; \ |
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54 | } else { \ |
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55 | return s + 2*self->limit; \ |
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56 | } \ |
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57 | break; \ |
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58 | case ROARDSP_CLIP_MODE_NOISE: \ |
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59 | return (s > 0 ? 1 : -1) * (self->limit - (roar_random_uint16() & 0xFF)); \ |
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60 | break; \ |
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61 | } \ |
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62 | \ |
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63 | ROAR_WARN("_clip16(s=%i, self=%p{.mode=%i, ...}) = 0 // ERROR: Bad mode", (int)s, self, (int)self->mode); \ |
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64 | return 0; \ |
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65 | } |
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66 | |
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67 | #define _calcX(bits) \ |
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68 | int roardsp_clip_calc##bits (struct roardsp_filter * filter, void * data, size_t samples) { \ |
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69 | struct roardsp_clip * self = filter->inst; \ |
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70 | int##bits##_t * samp = (int##bits##_t *) data; \ |
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71 | register int32_t s = self->limit; \ |
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72 | size_t i; \ |
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73 | \ |
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74 | for (i = 0; i < samples; i++) { \ |
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75 | if ( samp[i] > s ) { \ |
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76 | samp[i] = _clip##bits (samp[i], self); \ |
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77 | } else if ( -samp[i] > s ) { \ |
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78 | samp[i] = _clip##bits (samp[i], self); \ |
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79 | } \ |
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80 | } \ |
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81 | \ |
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82 | ROAR_DBG("roardsp_quantify_calc16(*) = 0"); \ |
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83 | return 0; \ |
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84 | } |
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85 | |
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86 | #define _setX(bits) \ |
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87 | _clipX(bits) \ |
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88 | _calcX(bits) |
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89 | |
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90 | _setX(8) |
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91 | _setX(16) |
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92 | _setX(32) |
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93 | |
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94 | int roardsp_clip_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
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95 | struct roardsp_clip * self = filter->inst; |
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96 | int32_t old; |
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97 | |
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98 | switch (cmd) { |
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99 | case ROARDSP_FCTL_LIMIT: |
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100 | old = self->limit; |
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101 | self->limit = labs(*(int32_t*)data); |
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102 | *(int32_t*)data = old; |
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103 | break; |
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104 | case ROARDSP_FCTL_MODE: |
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105 | old = self->mode; |
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106 | self->mode = *(int32_t*)data; |
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107 | *(int32_t*)data = old; |
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108 | break; |
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109 | default: |
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110 | ROAR_DBG("roardsp_clip_ctl(*) = -1"); |
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111 | return -1; |
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112 | break; |
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113 | } |
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114 | |
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115 | |
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116 | ROAR_DBG("roardsp_clip_ctl(*) = 0"); |
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117 | return 0; |
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118 | } |
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119 | |
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120 | int roardsp_clip_reset (struct roardsp_filter * filter, int what) { |
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121 | int32_t mode = ROARDSP_CLIP_MODE_LIMIT; |
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122 | int32_t n; |
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123 | |
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124 | if ( filter == NULL ) |
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125 | return -1; |
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126 | |
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127 | switch (filter->bits) { |
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128 | case 8: n = 64L; break; |
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129 | case 16: n = 16384L; break; |
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130 | case 32: n = 1073741824L; break; |
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131 | default: |
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132 | roar_err_set(ROAR_ERROR_NOTSUP); |
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133 | return -1; |
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134 | break; |
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135 | } |
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136 | |
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137 | switch (what) { |
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138 | case ROARDSP_RESET_NONE: |
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139 | case ROARDSP_RESET_STATE: |
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140 | return 0; |
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141 | break; |
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142 | case ROARDSP_RESET_FULL: |
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143 | roardsp_clip_ctl(filter, ROARDSP_FCTL_LIMIT, &n); |
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144 | roardsp_clip_ctl(filter, ROARDSP_FCTL_MODE, &mode); |
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145 | return 0; |
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146 | break; |
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147 | default: |
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148 | return -1; |
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149 | } |
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150 | |
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151 | return -1; |
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152 | } |
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153 | |
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154 | //ll |
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