1 | //float.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2014 |
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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, 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 | static inline float _si32_to_float (int32_t src) { |
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28 | if ( src > 0 ) { |
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29 | return (float)src / 2147483647.f; |
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30 | } else { |
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31 | return (float)src / 2147483648.f; |
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32 | } |
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33 | } |
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34 | |
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35 | static inline int32_t _float_to_si32 (float src) { |
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36 | if ( src > 0 ) { |
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37 | return (src * 2147483647.f); |
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38 | } else { |
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39 | return (src * 2147483648.f); |
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40 | } |
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41 | } |
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42 | |
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43 | int roar_conv_int32_float(float * dst, const int32_t * src, size_t len) { |
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44 | size_t i; |
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45 | |
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46 | if ( len == 0 ) |
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47 | return 0; |
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48 | |
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49 | if ( dst == NULL || src == NULL ) |
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50 | return -1; |
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51 | |
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52 | for (i = 0; i < len; i++) |
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53 | dst[i] = _si32_to_float(src[i]); |
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54 | |
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55 | return 0; |
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56 | } |
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57 | |
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58 | int roar_conv_float_int32(int32_t * dst, const float * src, size_t len) { |
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59 | size_t i; |
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60 | |
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61 | if ( len == 0 ) |
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62 | return 0; |
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63 | |
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64 | if ( dst == NULL || src == NULL ) |
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65 | return -1; |
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66 | |
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67 | for (i = 0; i < len; i++) |
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68 | dst[i] = _float_to_si32(src[i]); |
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69 | |
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70 | return 0; |
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71 | } |
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72 | |
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73 | int roar_conv_int32_float_deint(float ** dst, const int32_t * src, size_t len, size_t channels) { |
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74 | register size_t i, c, o; |
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75 | |
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76 | ROAR_DBG("roar_conv_int32_float_deint(*) = ?"); |
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77 | |
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78 | if ( len == 0 ) |
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79 | return 0; |
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80 | |
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81 | ROAR_DBG("roar_conv_int32_float_deint(*) = ?"); |
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82 | |
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83 | if ( dst == NULL || src == NULL ) |
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84 | return -1; |
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85 | |
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86 | ROAR_DBG("roar_conv_int32_float_deint(*) = ?"); |
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87 | |
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88 | // check if len is a multiple of channels: |
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89 | if ( (len % channels) != 0 ) |
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90 | return -1; |
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91 | |
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92 | ROAR_DBG("roar_conv_int32_float_deint(*) = ?"); |
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93 | |
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94 | for (c = 0; c < channels; c++) |
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95 | if ( dst[c] == NULL ) |
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96 | return -1; |
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97 | |
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98 | ROAR_DBG("roar_conv_int32_float_deint(*) = ?"); |
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99 | |
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100 | switch (channels) { |
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101 | case 1: |
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102 | return roar_conv_int32_float(dst[0], src, len); |
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103 | break; |
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104 | case 2: |
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105 | for (i = o = 0; i < len; i += 2, o += 1) { |
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106 | dst[0][o] = _si32_to_float(src[i+0]); |
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107 | dst[1][o] = _si32_to_float(src[i+1]); |
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108 | } |
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109 | break; |
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110 | default: |
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111 | for (i = c = o = 0; i < len; i++) { |
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112 | dst[c][o] = _si32_to_float(src[i]); |
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113 | c++; |
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114 | if ( c == channels ) { |
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115 | c = 0; |
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116 | o++; |
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117 | } |
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118 | } |
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119 | break; |
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120 | } |
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121 | |
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122 | return 0; |
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123 | } |
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124 | |
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125 | int roar_conv_float_int32_enint(int32_t * dst, const float ** src, size_t len, size_t channels) { |
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126 | size_t i, c, o; |
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127 | |
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128 | if ( len == 0 ) |
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129 | return 0; |
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130 | |
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131 | if ( dst == NULL || src == NULL ) |
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132 | return -1; |
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133 | |
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134 | // check if len is a multiple of channels: |
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135 | if ( (len % channels) != 0 ) |
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136 | return -1; |
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137 | |
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138 | for (c = 0; c < channels; c++) |
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139 | if ( src[c] == NULL ) |
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140 | return -1; |
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141 | |
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142 | switch (channels) { |
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143 | default: |
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144 | for (i = c = o = 0; o < len; o++) { |
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145 | dst[o] = _float_to_si32(src[c][i]); |
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146 | c++; |
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147 | if ( c == channels ) { |
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148 | c = 0; |
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149 | i++; |
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150 | } |
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151 | } |
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152 | break; |
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153 | } |
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154 | |
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155 | return 0; |
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156 | } |
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157 | |
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158 | //ll |
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