1 | //remove.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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22 | * |
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23 | */ |
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24 | |
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25 | #include "libroardsp.h" |
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26 | |
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27 | int roar_remove_init (struct roar_remove_state * state) { |
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28 | if ( state == NULL ) |
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29 | return -1; |
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30 | |
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31 | memset(state, 0, sizeof(struct roar_remove_state)); |
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32 | |
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33 | state->old = 65535; |
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34 | |
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35 | return 0; |
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36 | } |
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37 | |
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38 | int roar_remove (void * inout, void * subs, int samples, int bits, struct roar_remove_state * state) { |
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39 | if ( inout == NULL || subs == NULL || samples < 0 ) |
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40 | return -1; |
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41 | |
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42 | switch (bits) { |
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43 | case 8: return roar_remove_8 (inout, subs, samples, state); break; |
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44 | case 16: return roar_remove_16(inout, subs, samples, state); break; |
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45 | case 32: return roar_remove_32(inout, subs, samples, state); break; |
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46 | } |
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47 | |
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48 | return -1; |
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49 | } |
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50 | |
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51 | int roar_remove_8 (int8_t * inout, int8_t * subs, int samples, struct roar_remove_state * state) { |
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52 | int i; |
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53 | register int_least16_t s; |
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54 | register int_least16_t peak; |
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55 | |
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56 | if ( state == NULL ) { |
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57 | for (i = 0; i < samples; i++) { |
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58 | s = inout[i]; |
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59 | s -= subs[i]; |
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60 | inout[i] = s; |
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61 | } |
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62 | } else { |
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63 | peak = 127; |
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64 | for (i = 0; i < samples; i++) { |
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65 | s = inout[i]; |
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66 | s -= subs[i]; |
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67 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
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68 | if ( s > peak ) |
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69 | peak = s; |
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70 | } |
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71 | |
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72 | for (i = 0; i < samples; i++) { |
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73 | s = -subs[i]; |
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74 | s *= 127; |
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75 | s /= peak; |
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76 | s += inout[i]; |
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77 | inout[i] = s; |
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78 | } |
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79 | } |
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80 | |
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81 | return 0; |
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82 | } |
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83 | |
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84 | int roar_remove_16 (int16_t * inout, int16_t * subs, int samples, struct roar_remove_state * state) { |
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85 | int i; |
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86 | register int32_t s; |
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87 | register int32_t peak; |
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88 | |
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89 | if ( state == NULL ) { |
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90 | for (i = 0; i < samples; i++) { |
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91 | s = inout[i]; |
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92 | s -= subs[i]; |
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93 | inout[i] = s; |
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94 | } |
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95 | } else { |
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96 | peak = 65535; |
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97 | for (i = 0; i < samples; i++) { |
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98 | s = inout[i]; |
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99 | s -= subs[i]; |
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100 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
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101 | if ( s > peak ) |
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102 | peak = s; |
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103 | } |
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104 | |
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105 | for (i = 0; i < samples; i++) { |
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106 | s = -subs[i]; |
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107 | s *= 65535; |
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108 | s /= peak; |
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109 | s += inout[i]; |
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110 | inout[i] = s; |
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111 | } |
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112 | } |
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113 | |
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114 | return 0; |
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115 | } |
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116 | |
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117 | int roar_remove_32 (int32_t * inout, int32_t * subs, int samples, struct roar_remove_state * state) { |
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118 | int i; |
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119 | register int64_t s; |
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120 | register int64_t peak; |
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121 | |
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122 | if ( state == NULL ) { |
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123 | for (i = 0; i < samples; i++) { |
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124 | s = inout[i]; |
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125 | s -= subs[i]; |
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126 | inout[i] = s; |
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127 | } |
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128 | } else { |
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129 | peak = 4294967295UL; |
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130 | for (i = 0; i < samples; i++) { |
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131 | s = inout[i]; |
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132 | s -= subs[i]; |
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133 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
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134 | if ( s > peak ) |
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135 | peak = s; |
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136 | } |
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137 | |
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138 | for (i = 0; i < samples; i++) { |
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139 | s = -subs[i]; |
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140 | s *= 4294967295UL; |
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141 | s /= peak; |
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142 | s += inout[i]; |
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143 | inout[i] = s; |
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144 | } |
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145 | } |
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146 | |
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147 | return 0; |
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148 | } |
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149 | |
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150 | int roar_remove_so (void * subout, void * in, int samples, int bits, struct roar_remove_state * state) { |
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151 | if ( subout == NULL || in == NULL || samples < 0 ) |
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152 | return -1; |
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153 | |
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154 | switch (bits) { |
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155 | case 8: return roar_remove_so8 (subout, in, samples, state); break; |
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156 | case 16: return roar_remove_so16(subout, in, samples, state); break; |
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157 | case 32: return roar_remove_so32(subout, in, samples, state); break; |
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158 | } |
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159 | |
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160 | return -1; |
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161 | } |
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162 | |
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163 | int roar_remove_so8 (int8_t * subout, int8_t * in, int samples, struct roar_remove_state * state) { |
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164 | int i; |
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165 | register int_least16_t s; |
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166 | register int_least16_t peak; |
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167 | |
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168 | if ( state == NULL ) { |
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169 | for (i = 0; i < samples; i++) { |
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170 | s = -subout[i]; |
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171 | s += in[i]; |
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172 | subout[i] = s; |
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173 | } |
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174 | } else { |
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175 | peak = 127; |
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176 | for (i = 0; i < samples; i++) { |
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177 | s = -subout[i]; |
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178 | s += in[i]; |
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179 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
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180 | if ( s > peak ) |
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181 | peak = s; |
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182 | } |
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183 | |
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184 | for (i = 0; i < samples; i++) { |
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185 | s = -subout[i]; |
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186 | s *= 127; |
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187 | s /= peak; |
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188 | s += in[i]; |
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189 | subout[i] = s; |
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190 | } |
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191 | } |
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192 | |
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193 | return 0; |
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194 | } |
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195 | |
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196 | int roar_remove_so16 (int16_t * subout, int16_t * in, int samples, struct roar_remove_state * state) { |
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197 | int i; |
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198 | register int32_t s; |
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199 | register int32_t peak; |
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200 | |
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201 | if ( state == NULL ) { |
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202 | for (i = 0; i < samples; i++) { |
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203 | s = -subout[i]; |
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204 | s += in[i]; |
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205 | subout[i] = s; |
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206 | } |
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207 | } else { |
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208 | peak = 65535; |
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209 | for (i = 0; i < samples; i++) { |
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210 | s = -subout[i]; |
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211 | s += in[i]; |
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212 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
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213 | if ( s > peak ) |
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214 | peak = s; |
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215 | } |
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216 | |
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217 | for (i = 0; i < samples; i++) { |
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218 | s = -subout[i]; |
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219 | s *= 65535; |
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220 | s /= peak; |
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221 | s += in[i]; |
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222 | subout[i] = s; |
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223 | } |
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224 | } |
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225 | |
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226 | return 0; |
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227 | } |
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228 | |
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229 | int roar_remove_so32 (int32_t * subout, int32_t * in, int samples, struct roar_remove_state * state) { |
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230 | int i; |
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231 | register int64_t s; |
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232 | register int64_t peak; |
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233 | |
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234 | if ( state == NULL ) { |
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235 | for (i = 0; i < samples; i++) { |
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236 | s = -subout[i]; |
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237 | s += in[i]; |
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238 | subout[i] = s; |
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239 | } |
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240 | } else { |
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241 | peak = 2147483647UL; |
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242 | for (i = 0; i < samples; i++) { |
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243 | s = -subout[i]; |
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244 | s += in[i]; |
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245 | s = s < 0 ? -s : s; // we true 32 bit, not int operation here |
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246 | if ( s > peak ) |
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247 | peak = s; |
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248 | } |
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249 | |
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250 | for (i = 0; i < samples; i++) { |
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251 | s = -subout[i]; |
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252 | s *= 2147483647UL; |
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253 | s /= peak; |
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254 | s += in[i]; |
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255 | subout[i] = s; |
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256 | } |
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257 | } |
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258 | |
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259 | return 0; |
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260 | } |
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261 | |
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262 | //ll |
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