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 - 2008-2011 |
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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 | int roardsp_clip_init (struct roardsp_filter * filter, struct roar_stream * stream, int id) { |
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29 | if ( (filter->inst = roar_mm_malloc(sizeof(struct roardsp_clip))) == NULL ) |
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30 | return -1; |
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31 | |
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32 | return roardsp_filter_reset(filter, ROARDSP_RESET_FULL); |
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33 | } |
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34 | |
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35 | int roardsp_clip_uninit(struct roardsp_filter * filter) { |
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36 | roar_mm_free(filter->inst); |
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37 | return 0; |
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38 | } |
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39 | |
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40 | static inline int16_t _clip16(int16_t s, struct roardsp_clip * self) { |
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41 | switch (self->mode) { |
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42 | case ROARDSP_CLIP_MODE_LIMIT: |
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43 | return s > 0 ? self->limit : -self->limit; |
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44 | break; |
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45 | case ROARDSP_CLIP_MODE_ZERO: |
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46 | return 0; |
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47 | break; |
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48 | case ROARDSP_CLIP_MODE_WARP: |
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49 | if ( s > 0 ) { |
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50 | return s - 2*self->limit; |
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51 | } else { |
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52 | return s + 2*self->limit; |
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53 | } |
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54 | break; |
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55 | case ROARDSP_CLIP_MODE_NOISE: |
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56 | return (s > 0 ? 1 : -1) * (self->limit - (roar_random_uint16() & 0xFF)); |
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57 | break; |
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58 | } |
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59 | |
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60 | ROAR_WARN("_clip16(s=%i, self=%p{.mode=%i, ...}) = 0 // ERROR: Bad mode", (int)s, self, (int)self->mode); |
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61 | return 0; |
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62 | } |
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63 | |
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64 | int roardsp_clip_calc16 (struct roardsp_filter * filter, void * data, size_t samples) { |
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65 | struct roardsp_clip * self = filter->inst; |
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66 | int16_t * samp = (int16_t *) data; |
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67 | register int32_t s = self->limit; |
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68 | size_t i; |
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69 | |
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70 | for (i = 0; i < samples; i++) { |
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71 | if ( samp[i] > s ) { |
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72 | samp[i] = _clip16(samp[i], self); |
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73 | } else if ( -samp[i] > s ) { |
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74 | samp[i] = _clip16(samp[i], self); |
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75 | } |
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76 | } |
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77 | |
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78 | ROAR_DBG("roardsp_quantify_calc16(*) = 0"); |
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79 | return 0; |
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80 | } |
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81 | |
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82 | int roardsp_clip_ctl (struct roardsp_filter * filter, int cmd, void * data) { |
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83 | struct roardsp_clip * self = filter->inst; |
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84 | int32_t old; |
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85 | |
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86 | switch (cmd) { |
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87 | case ROARDSP_FCTL_LIMIT: |
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88 | old = self->limit; |
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89 | self->limit = labs(*(int32_t*)data); |
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90 | *(int32_t*)data = old; |
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91 | break; |
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92 | case ROARDSP_FCTL_MODE: |
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93 | old = self->mode; |
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94 | self->mode = *(int32_t*)data; |
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95 | *(int32_t*)data = old; |
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96 | break; |
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97 | default: |
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98 | ROAR_DBG("roardsp_clip_ctl(*) = -1"); |
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99 | return -1; |
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100 | break; |
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101 | } |
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102 | |
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103 | |
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104 | ROAR_DBG("roardsp_clip_ctl(*) = 0"); |
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105 | return 0; |
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106 | } |
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107 | |
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108 | int roardsp_clip_reset (struct roardsp_filter * filter, int what) { |
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109 | int32_t n = 16384; |
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110 | int32_t mode = ROARDSP_CLIP_MODE_LIMIT; |
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111 | |
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112 | if ( filter == NULL ) |
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113 | return -1; |
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114 | |
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115 | switch (what) { |
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116 | case ROARDSP_RESET_NONE: |
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117 | case ROARDSP_RESET_STATE: |
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118 | return 0; |
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119 | break; |
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120 | case ROARDSP_RESET_FULL: |
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121 | roardsp_clip_ctl(filter, ROARDSP_FCTL_LIMIT, &n); |
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122 | roardsp_clip_ctl(filter, ROARDSP_FCTL_MODE, &mode); |
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123 | return 0; |
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124 | break; |
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125 | default: |
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126 | return -1; |
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127 | } |
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128 | |
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129 | return -1; |
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130 | } |
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131 | |
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132 | //ll |
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