1 | //rms.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009-2013 |
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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 | int64_t roar_rms2_1_8 (int8_t * data, size_t samples) { |
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29 | register int64_t s = 0; |
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30 | register size_t i; |
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31 | |
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32 | for (i = 0; i < samples; i++) |
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33 | s += data[i] * data[i]; |
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34 | |
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35 | s /= samples; |
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36 | |
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37 | return s; |
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38 | } |
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39 | |
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40 | int64_t roar_rms2_1_16 (int16_t * data, size_t samples) { |
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41 | register int64_t s = 0; |
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42 | register size_t i; |
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43 | |
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44 | for (i = 0; i < samples; i++) |
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45 | s += data[i] * data[i]; |
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46 | |
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47 | s /= samples; |
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48 | |
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49 | return s; |
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50 | } |
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51 | |
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52 | int64_t roar_rms2_1_32 (int32_t * data, size_t samples) { |
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53 | register int64_t s = 0; |
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54 | register size_t i; |
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55 | |
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56 | for (i = 0; i < samples; i++) |
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57 | s += data[i] * data[i]; |
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58 | |
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59 | s /= samples; |
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60 | |
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61 | return s; |
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62 | } |
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63 | |
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64 | |
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65 | int roar_rms2_1_8_2 (int8_t * data, size_t samples, int64_t * rms) { |
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66 | register int64_t a0 = 0, a1 = 0; |
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67 | register size_t i; |
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68 | |
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69 | if ( samples == 0 ) |
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70 | return 0; |
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71 | |
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72 | if ( data == NULL ) |
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73 | return -1; |
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74 | |
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75 | if ( samples & 0x1 ) /* odd */ |
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76 | return -1; |
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77 | |
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78 | for (i = 0; i < samples; i += 2) { |
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79 | a0 += data[i+0] * data[i+0]; |
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80 | a1 += data[i+1] * data[i+1]; |
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81 | } |
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82 | |
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83 | samples /= 2; |
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84 | |
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85 | a0 /= samples; |
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86 | a1 /= samples; |
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87 | |
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88 | rms[0] = a0; |
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89 | rms[1] = a1; |
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90 | |
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91 | return 0; |
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92 | } |
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93 | |
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94 | int roar_rms2_1_16_2 (int16_t * data, size_t samples, int64_t * rms) { |
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95 | register int64_t a0 = 0, a1 = 0; |
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96 | register size_t i; |
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97 | |
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98 | if ( samples == 0 ) |
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99 | return 0; |
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100 | |
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101 | if ( data == NULL ) |
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102 | return -1; |
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103 | |
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104 | if ( samples & 0x1 ) /* odd */ |
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105 | return -1; |
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106 | |
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107 | for (i = 0; i < samples; i += 2) { |
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108 | a0 += data[i+0] * data[i+0]; |
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109 | a1 += data[i+1] * data[i+1]; |
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110 | } |
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111 | |
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112 | samples /= 2; |
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113 | |
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114 | a0 /= samples; |
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115 | a1 /= samples; |
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116 | |
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117 | rms[0] = a0; |
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118 | rms[1] = a1; |
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119 | |
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120 | return 0; |
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121 | } |
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122 | |
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123 | int roar_rms2_1_32_2 (int32_t * data, size_t samples, int64_t * rms) { |
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124 | register int64_t a0 = 0, a1 = 0; |
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125 | register size_t i; |
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126 | |
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127 | if ( samples == 0 ) |
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128 | return 0; |
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129 | |
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130 | if ( data == NULL ) |
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131 | return -1; |
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132 | |
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133 | if ( samples & 0x1 ) /* odd */ |
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134 | return -1; |
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135 | |
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136 | for (i = 0; i < samples; i += 2) { |
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137 | a0 += data[i+0] * data[i+0]; |
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138 | a1 += data[i+1] * data[i+1]; |
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139 | } |
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140 | |
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141 | samples /= 2; |
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142 | |
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143 | a0 /= samples; |
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144 | a1 /= samples; |
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145 | |
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146 | rms[0] = a0; |
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147 | rms[1] = a1; |
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148 | |
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149 | return 0; |
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150 | } |
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151 | |
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152 | |
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153 | int roar_rms2_1_8_n (int8_t * data, size_t samples, int64_t * rms, size_t n) { |
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154 | if ( n == 0 ) |
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155 | return 0; |
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156 | |
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157 | if ( rms == NULL ) |
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158 | return -1; |
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159 | |
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160 | switch (n) { |
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161 | case 1: return *rms = roar_rms2_1_8(data, samples); return *rms == -1 ? -1 : 0; break; |
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162 | case 2: return roar_rms2_1_8_2(data, samples, rms); break; |
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163 | default: |
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164 | return -1; |
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165 | } |
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166 | } |
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167 | |
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168 | int roar_rms2_1_16_n (int16_t * data, size_t samples, int64_t * rms, size_t n) { |
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169 | if ( n == 0 ) |
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170 | return 0; |
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171 | |
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172 | if ( rms == NULL ) |
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173 | return -1; |
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174 | |
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175 | switch (n) { |
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176 | case 1: return *rms = roar_rms2_1_16(data, samples); return *rms == -1 ? -1 : 0; break; |
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177 | case 2: return roar_rms2_1_16_2(data, samples, rms); break; |
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178 | default: |
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179 | return -1; |
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180 | } |
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181 | } |
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182 | |
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183 | int roar_rms2_1_32_n (int32_t * data, size_t samples, int64_t * rms, size_t n) { |
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184 | if ( n == 0 ) |
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185 | return 0; |
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186 | |
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187 | if ( rms == NULL ) |
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188 | return -1; |
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189 | |
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190 | switch (n) { |
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191 | case 1: return *rms = roar_rms2_1_32(data, samples); return *rms == -1 ? -1 : 0; break; |
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192 | case 2: return roar_rms2_1_32_2(data, samples, rms); break; |
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193 | default: |
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194 | return -1; |
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195 | } |
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196 | } |
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197 | |
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198 | |
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199 | int roar_rms2_1_b_n (void * data, size_t samples, int64_t * rms, size_t n, size_t bits) { |
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200 | switch (bits) { |
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201 | case 8: return roar_rms2_1_8_n(data, samples, rms, n); break; |
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202 | case 16: return roar_rms2_1_16_n(data, samples, rms, n); break; |
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203 | case 32: return roar_rms2_1_32_n(data, samples, rms, n); break; |
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204 | default: |
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205 | return -1; |
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206 | } |
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207 | } |
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208 | |
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209 | //ll |
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