1 | //midside.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_conv_s2ms_8 (void * out, void * in, int samples) { |
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28 | char * ip = in; |
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29 | char * op = out; |
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30 | register int i; |
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31 | register char mid; |
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32 | register char side; |
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33 | |
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34 | for (i = 0; i < samples; i += 2) { |
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35 | mid = (ip[i] + ip[i+1])/2; |
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36 | side = (ip[i] - ip[i+1])/2; |
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37 | op[i ] = mid; |
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38 | op[i+1] = side; |
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39 | } |
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40 | |
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41 | return 0; |
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42 | } |
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43 | |
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44 | int roar_conv_s2ms_16 (void * out, void * in, int samples) { |
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45 | int16_t * ip = in; |
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46 | int16_t * op = out; |
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47 | register int i; |
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48 | register int16_t mid; |
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49 | register int16_t side; |
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50 | |
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51 | for (i = 0; i < samples; i += 2) { |
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52 | mid = (ip[i] + ip[i+1])/2; |
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53 | side = (ip[i] - ip[i+1])/2; |
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54 | op[i ] = mid; |
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55 | op[i+1] = side; |
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56 | } |
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57 | |
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58 | return 0; |
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59 | } |
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60 | |
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61 | int roar_conv_s2ms_32 (void * out, void * in, int samples) { |
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62 | int32_t * ip = in; |
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63 | int32_t * op = out; |
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64 | register int i; |
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65 | register int32_t mid; |
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66 | register int32_t side; |
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67 | |
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68 | for (i = 0; i < samples; i += 2) { |
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69 | mid = (ip[i] + ip[i+1])/2; |
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70 | side = (ip[i] - ip[i+1])/2; |
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71 | op[i ] = mid; |
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72 | op[i+1] = side; |
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73 | } |
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74 | |
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75 | return 0; |
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76 | } |
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77 | |
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78 | int roar_conv_ms2s_8 (void * out, void * in, int samples) { |
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79 | char * ip = in; |
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80 | char * op = out; |
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81 | register int i; |
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82 | register char mid; |
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83 | register char side; |
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84 | |
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85 | for (i = 0; i < samples; i += 2) { |
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86 | mid = ip[i]; |
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87 | side = ip[i+1]; |
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88 | op[i ] = mid + side; |
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89 | op[i+1] = mid - side; |
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90 | } |
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91 | |
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92 | return 0; |
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93 | } |
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94 | |
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95 | int roar_conv_ms2s_16 (void * out, void * in, int samples) { |
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96 | int16_t * ip = in; |
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97 | int16_t * op = out; |
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98 | register int i; |
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99 | register int16_t mid; |
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100 | register int16_t side; |
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101 | |
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102 | for (i = 0; i < samples; i += 2) { |
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103 | mid = ip[i]; |
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104 | side = ip[i+1]; |
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105 | op[i ] = mid + side; |
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106 | op[i+1] = mid - side; |
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107 | } |
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108 | |
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109 | return 0; |
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110 | } |
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111 | |
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112 | int roar_conv_ms2s_32 (void * out, void * in, int samples) { |
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113 | int32_t * ip = in; |
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114 | int32_t * op = out; |
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115 | register int i; |
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116 | register int32_t mid; |
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117 | register int32_t side; |
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118 | |
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119 | for (i = 0; i < samples; i += 2) { |
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120 | mid = ip[i]; |
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121 | side = ip[i+1]; |
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122 | op[i ] = mid + side; |
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123 | op[i+1] = mid - side; |
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124 | } |
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125 | |
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126 | return 0; |
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127 | } |
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128 | |
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129 | |
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130 | //ll |
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