1 | //resampler_poly3.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2013 |
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5 | * Copyright (C) Hans-Kristian 'maister' Arntzen - 2010 |
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6 | * |
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7 | * This file is part of libroar a part of RoarAudio, |
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8 | * a cross-platform sound system for both, home and professional use. |
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9 | * See README for details. |
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10 | * |
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11 | * This file is free software; you can redistribute it and/or modify |
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12 | * it under the terms of the GNU General Public License version 3 |
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13 | * as published by the Free Software Foundation. |
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14 | * |
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15 | * libroar is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 | * GNU General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU General Public License |
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21 | * along with this software; see the file COPYING. If not, write to |
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22 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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23 | * Boston, MA 02110-1301, USA. |
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24 | * |
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25 | * NOTE for everyone want's to change something and send patches: |
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26 | * read README and HACKING! There a addition information on |
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27 | * the license of this document you need to read before you send |
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28 | * any patches. |
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29 | * |
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30 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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31 | * or libpulse*: |
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32 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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33 | * and are therefore GPL. Because of this it may be illigal to use |
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34 | * them with any software that uses libesd, libartsc or libpulse*. |
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35 | */ |
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36 | |
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37 | #include "libroardsp.h" |
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38 | |
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39 | int roar_conv_poly3_8 (int8_t * out, int8_t * in, size_t olen, size_t ilen, int channels) { |
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40 | float ratio = (float)olen / (float)ilen; |
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41 | int8_t *ip; |
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42 | int c, x; |
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43 | float pos_in; |
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44 | float poly[3]; |
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45 | float y[3]; |
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46 | float x_val; |
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47 | int_least16_t temp; |
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48 | |
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49 | /* Can't create poly out of less than 3 samples in each channel. */ |
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50 | if ( ilen < 3 * channels ) |
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51 | return -1; |
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52 | |
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53 | ip = roar_mm_malloc(ilen * sizeof(int8_t)); |
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54 | if ( ip == NULL ) |
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55 | return -1; |
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56 | |
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57 | memcpy(ip, in, ilen * sizeof(int8_t)); |
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58 | |
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59 | olen /= channels; |
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60 | |
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61 | for (x = 0; x < olen; x++) { |
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62 | for (c = 0; c < channels; c++) { |
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63 | pos_in = (float)x / ratio; |
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64 | |
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65 | if ( (int)pos_in == 0 ) { |
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66 | y[0] = ip[0 * channels + c]; |
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67 | y[1] = ip[1 * channels + c]; |
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68 | y[2] = ip[2 * channels + c]; |
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69 | x_val = pos_in; |
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70 | roar_math_mkpoly_3x3(poly, y); |
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71 | } else if ( (int)pos_in + 1 >= ilen/channels ) { |
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72 | /* If we're at the end of the block, we will need to interpolate against a value that is not yet known. |
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73 | * We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */ |
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74 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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75 | y[1] = ip[((int)pos_in ) * channels + c]; |
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76 | |
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77 | // we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly |
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78 | roar_math_mkpoly_2x2(poly, y); |
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79 | poly[2] = 0; |
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80 | x_val = pos_in - (int)pos_in + 1.0; |
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81 | } else { |
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82 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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83 | y[1] = ip[((int)pos_in ) * channels + c]; |
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84 | y[2] = ip[((int)pos_in + 1) * channels + c]; |
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85 | x_val = pos_in - (int)pos_in + 1.0; |
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86 | roar_math_mkpoly_3x3(poly, y); |
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87 | } |
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88 | |
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89 | |
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90 | temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5); |
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91 | /* temp could be out of bounds, so need to check this */ |
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92 | if ( temp > 0x7E ) { |
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93 | out[x * channels + c] = 0x7E; |
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94 | } else if (temp < -0x7F) { |
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95 | out[x * channels + c] = -0x7F; |
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96 | } else { |
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97 | out[x * channels + c] = (int8_t)temp; |
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98 | } |
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99 | } |
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100 | } |
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101 | |
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102 | roar_mm_free(ip); |
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103 | return 0; |
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104 | } |
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105 | |
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106 | int roar_conv_poly3_16 (int16_t * out, int16_t * in, size_t olen, size_t ilen, int channels) { |
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107 | float ratio = (float)olen / (float)ilen; |
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108 | int16_t *ip; |
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109 | int c, x; |
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110 | float pos_in; |
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111 | float poly[3]; |
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112 | float y[3]; |
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113 | float x_val; |
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114 | int_least32_t temp; |
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115 | |
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116 | /* Can't create poly out of less than 3 samples in each channel. */ |
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117 | if ( ilen < 3 * channels ) |
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118 | return -1; |
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119 | |
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120 | ip = roar_mm_malloc(ilen * sizeof(int16_t)); |
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121 | if ( ip == NULL ) |
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122 | return -1; |
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123 | |
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124 | memcpy(ip, in, ilen * sizeof(int16_t)); |
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125 | |
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126 | olen /= channels; |
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127 | |
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128 | for (x = 0; x < olen; x++) { |
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129 | for (c = 0; c < channels; c++) { |
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130 | pos_in = (float)x / ratio; |
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131 | |
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132 | if ( (int)pos_in == 0 ) { |
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133 | y[0] = ip[0 * channels + c]; |
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134 | y[1] = ip[1 * channels + c]; |
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135 | y[2] = ip[2 * channels + c]; |
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136 | x_val = pos_in; |
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137 | roar_math_mkpoly_3x3(poly, y); |
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138 | } else if ( (int)pos_in + 1 >= ilen/channels ) { |
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139 | /* If we're at the end of the block, we will need to interpolate against a value that is not yet known. |
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140 | * We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */ |
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141 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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142 | y[1] = ip[((int)pos_in ) * channels + c]; |
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143 | |
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144 | // we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly |
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145 | roar_math_mkpoly_2x2(poly, y); |
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146 | poly[2] = 0; |
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147 | x_val = pos_in - (int)pos_in + 1.0; |
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148 | } else { |
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149 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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150 | y[1] = ip[((int)pos_in ) * channels + c]; |
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151 | y[2] = ip[((int)pos_in + 1) * channels + c]; |
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152 | x_val = pos_in - (int)pos_in + 1.0; |
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153 | roar_math_mkpoly_3x3(poly, y); |
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154 | } |
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155 | |
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156 | |
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157 | temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5); |
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158 | /* temp could be out of bounds, so need to check this */ |
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159 | if (temp > 0x7FFE ) { |
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160 | out[x * channels + c] = 0x7FFE; |
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161 | } else if (temp < -0x7FFF) { |
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162 | out[x * channels + c] = -0x7FFF; |
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163 | } else { |
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164 | out[x * channels + c] = (int16_t)temp; |
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165 | } |
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166 | } |
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167 | } |
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168 | |
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169 | roar_mm_free(ip); |
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170 | return 0; |
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171 | } |
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172 | |
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173 | int roar_conv_poly3_32 (int32_t * out, int32_t * in, size_t olen, size_t ilen, int channels) { |
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174 | float ratio = (float)olen / (float)ilen; |
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175 | int32_t *ip; |
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176 | int c, x; |
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177 | float pos_in; |
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178 | float poly[3]; |
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179 | float y[3]; |
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180 | float x_val; |
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181 | int_least64_t temp; |
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182 | |
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183 | /* Can't create poly out of less than 3 samples in each channel. */ |
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184 | if ( ilen < 3 * channels ) |
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185 | return -1; |
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186 | |
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187 | ip = roar_mm_malloc(ilen * sizeof(int32_t)); |
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188 | if ( ip == NULL ) |
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189 | return -1; |
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190 | |
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191 | memcpy(ip, in, ilen * sizeof(int32_t)); |
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192 | |
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193 | olen /= channels; |
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194 | |
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195 | for (x = 0; x < olen; x++) { |
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196 | for (c = 0; c < channels; c++) { |
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197 | pos_in = (float)x / ratio; |
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198 | |
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199 | if ( (int)pos_in == 0 ) { |
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200 | y[0] = ip[0 * channels + c]; |
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201 | y[1] = ip[1 * channels + c]; |
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202 | y[2] = ip[2 * channels + c]; |
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203 | x_val = pos_in; |
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204 | roar_math_mkpoly_3x3(poly, y); |
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205 | } else if ( (int)pos_in + 1 >= ilen/channels ) { |
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206 | /* If we're at the end of the block, we will need to interpolate against a value that is not yet known. |
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207 | * We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */ |
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208 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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209 | y[1] = ip[((int)pos_in ) * channels + c]; |
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210 | |
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211 | // we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly |
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212 | roar_math_mkpoly_2x2(poly, y); |
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213 | poly[2] = 0; |
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214 | x_val = pos_in - (int)pos_in + 1.0; |
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215 | } else { |
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216 | y[0] = ip[((int)pos_in - 1) * channels + c]; |
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217 | y[1] = ip[((int)pos_in ) * channels + c]; |
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218 | y[2] = ip[((int)pos_in + 1) * channels + c]; |
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219 | x_val = pos_in - (int)pos_in + 1.0; |
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220 | roar_math_mkpoly_3x3(poly, y); |
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221 | } |
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222 | |
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223 | |
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224 | temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5); |
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225 | /* temp could be out of bounds, so need to check this */ |
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226 | if ( temp > 0x7FFFFFFE ) { |
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227 | out[x * channels + c] = 0x7FFFFFFE; |
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228 | } else if (temp < -0x7FFFFFFF) { |
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229 | out[x * channels + c] = -0x7FFFFFFF; |
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230 | } else { |
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231 | out[x * channels + c] = (int32_t)temp; |
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232 | } |
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233 | } |
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234 | } |
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235 | |
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236 | roar_mm_free(ip); |
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237 | return 0; |
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238 | } |
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239 | |
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