1 | <?php |
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2 | // +----------------------------------------------------------------------+ |
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3 | // | PHP version 5 | |
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4 | // +----------------------------------------------------------------------+ |
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5 | // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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6 | // +----------------------------------------------------------------------+ |
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7 | // | This source file is subject to version 2 of the GPL license, | |
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8 | // | that is bundled with this package in the file license.txt and is | |
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9 | // | available through the world-wide-web at the following url: | |
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10 | // | http://www.gnu.org/copyleft/gpl.html | |
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11 | // +----------------------------------------------------------------------+ |
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12 | // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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13 | // +----------------------------------------------------------------------+ |
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14 | // | Authors: James Heinrich <infoØgetid3*org> | |
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15 | // | Allan Hansen <ahØartemis*dk> | |
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16 | // +----------------------------------------------------------------------+ |
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17 | // | module.audio.dts.php | |
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18 | // | Module for analyzing DTS audio files | |
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19 | // | dependencies: NONE | |
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20 | // +----------------------------------------------------------------------+ |
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21 | // |
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22 | // $Id: module.audio.dts.php 3318 2009-05-20 21:54:10Z vdigital $ |
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23 | |
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24 | |
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25 | |
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26 | // Specs taken from "DTS Coherent Acoustics;Core and Extensions, ETSI TS 102 114 V1.2.1 (2002-12)" |
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27 | // (http://pda.etsi.org/pda/queryform.asp) |
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28 | // With thanks to Gambit <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/ |
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29 | |
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30 | class getid3_dts extends getid3_handler |
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31 | { |
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32 | |
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33 | public function Analyze() { |
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34 | |
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35 | $getid3 = $this->getid3; |
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36 | |
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37 | $getid3->info['dts'] = array (); |
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38 | $info_dts = &$getid3->info['dts']; |
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39 | |
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40 | $getid3->info['fileformat'] = 'dts'; |
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41 | |
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42 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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43 | $header = fread($getid3->fp, 16); |
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44 | |
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45 | $fhBS = getid3_lib::BigEndian2Bin(substr($header, 4, 12)); |
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46 | $bs_offset = 0; |
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47 | $info_dts['raw']['frame_type'] = bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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48 | $info_dts['raw']['deficit_samples'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5; |
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49 | $info_dts['flags']['crc_present'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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50 | $info_dts['raw']['pcm_sample_blocks'] = bindec(substr($fhBS, $bs_offset, 7)); $bs_offset += 7; |
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51 | $info_dts['raw']['frame_byte_size'] = bindec(substr($fhBS, $bs_offset, 14)); $bs_offset += 14; |
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52 | $info_dts['raw']['channel_arrangement'] = bindec(substr($fhBS, $bs_offset, 6)); $bs_offset += 6; |
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53 | $info_dts['raw']['sample_frequency'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4; |
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54 | $info_dts['raw']['bitrate'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5; |
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55 | $info_dts['flags']['embedded_downmix'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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56 | $info_dts['flags']['dynamicrange'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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57 | $info_dts['flags']['timestamp'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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58 | $info_dts['flags']['auxdata'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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59 | $info_dts['flags']['hdcd'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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60 | $info_dts['raw']['extension_audio'] = bindec(substr($fhBS, $bs_offset, 3)); $bs_offset += 3; |
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61 | $info_dts['flags']['extended_coding'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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62 | $info_dts['flags']['audio_sync_insertion'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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63 | $info_dts['raw']['lfe_effects'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2; |
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64 | $info_dts['flags']['predictor_history'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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65 | if ($info_dts['flags']['crc_present']) { |
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66 | $info_dts['raw']['crc16'] = bindec(substr($fhBS, $bs_offset, 16)); $bs_offset += 16; |
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67 | } |
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68 | $info_dts['flags']['mri_perfect_reconst'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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69 | $info_dts['raw']['encoder_soft_version'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4; |
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70 | $info_dts['raw']['copy_history'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2; |
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71 | $info_dts['raw']['bits_per_sample'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2; |
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72 | $info_dts['flags']['surround_es'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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73 | $info_dts['flags']['front_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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74 | $info_dts['flags']['surround_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; |
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75 | $info_dts['raw']['dialog_normalization'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4; |
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76 | |
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77 | |
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78 | $info_dts['bitrate'] = $this->DTSbitrateLookup($info_dts['raw']['bitrate']); |
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79 | $info_dts['bits_per_sample'] = $this->DTSbitPerSampleLookup($info_dts['raw']['bits_per_sample']); |
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80 | $info_dts['sample_rate'] = $this->DTSsampleRateLookup($info_dts['raw']['sample_frequency']); |
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81 | $info_dts['dialog_normalization'] = $this->DTSdialogNormalization($info_dts['raw']['dialog_normalization'], $info_dts['raw']['encoder_soft_version']); |
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82 | $info_dts['flags']['lossless'] = (($info_dts['raw']['bitrate'] == 31) ? true : false); |
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83 | $info_dts['bitrate_mode'] = (($info_dts['raw']['bitrate'] == 30) ? 'vbr' : 'cbr'); |
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84 | $info_dts['channels'] = $this->DTSnumChannelsLookup($info_dts['raw']['channel_arrangement']); |
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85 | $info_dts['channel_arrangement'] = $this->DTSchannelArrangementLookup($info_dts['raw']['channel_arrangement']); |
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86 | |
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87 | $getid3->info['audio']['dataformat'] = 'dts'; |
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88 | $getid3->info['audio']['lossless'] = $info_dts['flags']['lossless']; |
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89 | $getid3->info['audio']['bitrate_mode'] = $info_dts['bitrate_mode']; |
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90 | $getid3->info['audio']['bits_per_sample'] = $info_dts['bits_per_sample']; |
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91 | $getid3->info['audio']['sample_rate'] = $info_dts['sample_rate']; |
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92 | $getid3->info['audio']['channels'] = $info_dts['channels']; |
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93 | $getid3->info['audio']['bitrate'] = $info_dts['bitrate']; |
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94 | $getid3->info['playtime_seconds'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / ($info_dts['bitrate'] / 8); |
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95 | |
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96 | return true; |
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97 | } |
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98 | |
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99 | |
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100 | public static function DTSbitrateLookup($index) { |
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101 | |
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102 | static $lookup = array ( |
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103 | 0 => 32000, |
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104 | 1 => 56000, |
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105 | 2 => 64000, |
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106 | 3 => 96000, |
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107 | 4 => 112000, |
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108 | 5 => 128000, |
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109 | 6 => 192000, |
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110 | 7 => 224000, |
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111 | 8 => 256000, |
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112 | 9 => 320000, |
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113 | 10 => 384000, |
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114 | 11 => 448000, |
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115 | 12 => 512000, |
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116 | 13 => 576000, |
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117 | 14 => 640000, |
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118 | 15 => 768000, |
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119 | 16 => 960000, |
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120 | 17 => 1024000, |
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121 | 18 => 1152000, |
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122 | 19 => 1280000, |
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123 | 20 => 1344000, |
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124 | 21 => 1408000, |
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125 | 22 => 1411200, |
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126 | 23 => 1472000, |
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127 | 24 => 1536000, |
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128 | 25 => 1920000, |
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129 | 26 => 2048000, |
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130 | 27 => 3072000, |
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131 | 28 => 3840000, |
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132 | 29 => 'open', |
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133 | 30 => 'variable', |
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134 | 31 => 'lossless' |
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135 | ); |
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136 | return @$lookup[$index]; |
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137 | } |
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138 | |
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139 | |
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140 | public static function DTSsampleRateLookup($index) { |
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141 | |
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142 | static $lookup = array ( |
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143 | 0 => 'invalid', |
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144 | 1 => 8000, |
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145 | 2 => 16000, |
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146 | 3 => 32000, |
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147 | 4 => 'invalid', |
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148 | 5 => 'invalid', |
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149 | 6 => 11025, |
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150 | 7 => 22050, |
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151 | 8 => 44100, |
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152 | 9 => 'invalid', |
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153 | 10 => 'invalid', |
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154 | 11 => 12000, |
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155 | 12 => 24000, |
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156 | 13 => 48000, |
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157 | 14 => 'invalid', |
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158 | 15 => 'invalid' |
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159 | ); |
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160 | return @$lookup[$index]; |
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161 | } |
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162 | |
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163 | |
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164 | public static function DTSbitPerSampleLookup($index) { |
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165 | |
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166 | static $lookup = array ( |
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167 | 0 => 16, |
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168 | 1 => 20, |
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169 | 2 => 24, |
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170 | 3 => 24, |
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171 | ); |
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172 | return @$lookup[$index]; |
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173 | } |
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174 | |
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175 | |
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176 | public static function DTSnumChannelsLookup($index) { |
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177 | |
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178 | switch ($index) { |
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179 | case 0: |
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180 | return 1; |
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181 | |
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182 | case 1: |
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183 | case 2: |
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184 | case 3: |
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185 | case 4: |
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186 | return 2; |
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187 | |
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188 | case 5: |
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189 | case 6: |
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190 | return 3; |
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191 | |
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192 | case 7: |
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193 | case 8: |
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194 | return 4; |
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195 | |
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196 | case 9: |
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197 | return 5; |
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198 | |
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199 | case 10: |
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200 | case 11: |
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201 | case 12: |
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202 | return 6; |
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203 | |
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204 | case 13: |
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205 | return 7; |
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206 | |
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207 | case 14: |
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208 | case 15: |
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209 | return 8; |
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210 | } |
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211 | return false; |
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212 | } |
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213 | |
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214 | |
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215 | public static function DTSchannelArrangementLookup($index) { |
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216 | |
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217 | static $lookup = array ( |
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218 | 0 => 'A', |
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219 | 1 => 'A + B (dual mono)', |
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220 | 2 => 'L + R (stereo)', |
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221 | 3 => '(L+R) + (L-R) (sum-difference)', |
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222 | 4 => 'LT + RT (left and right total)', |
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223 | 5 => 'C + L + R', |
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224 | 6 => 'L + R + S', |
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225 | 7 => 'C + L + R + S', |
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226 | 8 => 'L + R + SL + SR', |
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227 | 9 => 'C + L + R + SL + SR', |
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228 | 10 => 'CL + CR + L + R + SL + SR', |
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229 | 11 => 'C + L + R+ LR + RR + OV', |
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230 | 12 => 'CF + CR + LF + RF + LR + RR', |
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231 | 13 => 'CL + C + CR + L + R + SL + SR', |
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232 | 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2', |
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233 | 15 => 'CL + C+ CR + L + R + SL + S + SR', |
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234 | ); |
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235 | return (@$lookup[$index] ? @$lookup[$index] : 'user-defined'); |
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236 | } |
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237 | |
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238 | |
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239 | public static function DTSdialogNormalization($index, $version) { |
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240 | |
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241 | switch ($version) { |
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242 | case 7: |
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243 | return 0 - $index; |
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244 | |
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245 | case 6: |
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246 | return 0 - 16 - $index; |
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247 | } |
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248 | return false; |
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249 | } |
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250 | |
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251 | } |
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252 | |
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253 | |
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254 | ?> |
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