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.la.php | |
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18 | // | Module for analyzing LA udio files | |
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19 | // | dependencies: module.audio-video.riff.php | |
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20 | // +----------------------------------------------------------------------+ |
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21 | // |
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22 | // $Id: module.audio.la.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 | class getid3_la extends getid3_handler |
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27 | { |
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28 | |
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29 | public function Analyze() { |
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30 | |
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31 | $getid3 = $this->getid3; |
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32 | |
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33 | $getid3->include_module('audio-video.riff'); |
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34 | |
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35 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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36 | $raw_data = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE); |
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37 | |
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38 | $getid3->info['fileformat'] = 'la'; |
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39 | $getid3->info['audio']['dataformat'] = 'la'; |
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40 | $getid3->info['audio']['lossless'] = true; |
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41 | |
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42 | $getid3->info['la']['version_major'] = (int)$raw_data{2}; |
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43 | $getid3->info['la']['version_minor'] = (int)$raw_data{3}; |
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44 | $getid3->info['la']['version'] = (float)$getid3->info['la']['version_major'] + ($getid3->info['la']['version_minor'] / 10); |
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45 | |
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46 | $getid3->info['la']['uncompressed_size'] = getid3_lib::LittleEndian2Int(substr($raw_data, 4, 4)); |
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47 | |
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48 | $wave_chunk = substr($raw_data, 8, 4); |
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49 | if ($wave_chunk !== 'WAVE') { |
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50 | throw new getid3_exception('Expected "WAVE" ('.getid3_lib::PrintHexBytes('WAVE').') at offset 8, found "'.$wave_chunk.'" ('.getid3_lib::PrintHexBytes($wave_chunk).') instead.'); |
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51 | } |
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52 | |
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53 | $offset = 12; |
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54 | |
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55 | $getid3->info['la']['fmt_size'] = 24; |
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56 | if ($getid3->info['la']['version'] >= 0.3) { |
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57 | |
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58 | $getid3->info['la']['fmt_size'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4)); |
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59 | $getid3->info['la']['header_size'] = 49 + $getid3->info['la']['fmt_size'] - 24; |
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60 | $offset += 4; |
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61 | |
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62 | } else { |
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63 | |
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64 | // version 0.2 didn't support additional data blocks |
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65 | $getid3->info['la']['header_size'] = 41; |
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66 | } |
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67 | |
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68 | $fmt_chunk = substr($raw_data, $offset, 4); |
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69 | if ($fmt_chunk !== 'fmt ') { |
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70 | throw new getid3_exception('Expected "fmt " ('.getid3_lib::PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.getid3_lib::PrintHexBytes($fmt_chunk).') instead.'); |
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71 | } |
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72 | $offset += 4; |
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73 | |
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74 | $fmt_size = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4)); |
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75 | $offset += 4; |
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76 | |
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77 | $getid3->info['la']['raw']['format'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 2)); |
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78 | $offset += 2; |
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79 | |
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80 | getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['la'], $raw_data, $offset, |
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81 | array ( |
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82 | 'channels' => 2, |
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83 | 'sample_rate' => 4, |
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84 | 'bytes_per_second' => 4, |
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85 | 'bytes_per_sample' => 2, |
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86 | 'bits_per_sample' => 2, |
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87 | 'samples' => 4 |
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88 | ) |
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89 | ); |
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90 | $offset += 18; |
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91 | |
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92 | $getid3->info['la']['raw']['flags'] = getid3_lib::LittleEndian2Int($raw_data{$offset++}); |
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93 | |
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94 | $getid3->info['la']['flags']['seekable'] = (bool)($getid3->info['la']['raw']['flags'] & 0x01); |
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95 | if ($getid3->info['la']['version'] >= 0.4) { |
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96 | $getid3->info['la']['flags']['high_compression'] = (bool)($getid3->info['la']['raw']['flags'] & 0x02); |
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97 | } |
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98 | |
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99 | $getid3->info['la']['original_crc'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4)); |
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100 | $offset += 4; |
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101 | |
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102 | // mikeØbevin*de |
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103 | // Basically, the blocksize/seekevery are 61440/19 in La0.4 and 73728/16 |
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104 | // in earlier versions. A seekpoint is added every blocksize * seekevery |
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105 | // samples, so 4 * int(totalSamples / (blockSize * seekEvery)) should |
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106 | // give the number of bytes used for the seekpoints. Of course, if seeking |
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107 | // is disabled, there are no seekpoints stored. |
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108 | |
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109 | if ($getid3->info['la']['version'] >= 0.4) { |
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110 | $getid3->info['la']['blocksize'] = 61440; |
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111 | $getid3->info['la']['seekevery'] = 19; |
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112 | } else { |
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113 | $getid3->info['la']['blocksize'] = 73728; |
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114 | $getid3->info['la']['seekevery'] = 16; |
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115 | } |
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116 | |
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117 | $getid3->info['la']['seekpoint_count'] = 0; |
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118 | if ($getid3->info['la']['flags']['seekable']) { |
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119 | $getid3->info['la']['seekpoint_count'] = floor($getid3->info['la']['samples'] / ($getid3->info['la']['blocksize'] * $getid3->info['la']['seekevery'])); |
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120 | |
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121 | for ($i = 0; $i < $getid3->info['la']['seekpoint_count']; $i++) { |
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122 | $getid3->info['la']['seekpoints'][] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4)); |
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123 | $offset += 4; |
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124 | } |
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125 | } |
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126 | |
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127 | if ($getid3->info['la']['version'] >= 0.3) { |
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128 | |
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129 | // Following the main header information, the program outputs all of the |
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130 | // seekpoints. Following these is what I called the 'footer start', |
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131 | // i.e. the position immediately after the La audio data is finished. |
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132 | |
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133 | $getid3->info['la']['footerstart'] = getid3_lib::LittleEndian2Int(substr($raw_data, $offset, 4)); |
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134 | $offset += 4; |
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135 | |
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136 | if ($getid3->info['la']['footerstart'] > $getid3->info['filesize']) { |
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137 | $getid3->warning('FooterStart value points to offset '.$getid3->info['la']['footerstart'].' which is beyond end-of-file ('.$getid3->info['filesize'].')'); |
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138 | $getid3->info['la']['footerstart'] = $getid3->info['filesize']; |
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139 | } |
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140 | |
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141 | } else { |
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142 | |
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143 | // La v0.2 didn't have FooterStart value |
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144 | $getid3->info['la']['footerstart'] = $getid3->info['avdataend']; |
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145 | |
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146 | } |
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147 | |
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148 | if ($getid3->info['la']['footerstart'] < $getid3->info['avdataend']) { |
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149 | |
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150 | // Create riff header |
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151 | $riff_data = 'WAVE'; |
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152 | if ($getid3->info['la']['version'] == 0.2) { |
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153 | $riff_data .= substr($raw_data, 12, 24); |
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154 | } else { |
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155 | $riff_data .= substr($raw_data, 16, 24); |
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156 | } |
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157 | if ($getid3->info['la']['footerstart'] < $getid3->info['avdataend']) { |
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158 | fseek($getid3->fp, $getid3->info['la']['footerstart'], SEEK_SET); |
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159 | $riff_data .= fread($getid3->fp, $getid3->info['avdataend'] - $getid3->info['la']['footerstart']); |
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160 | } |
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161 | $riff_data = 'RIFF'.getid3_lib::LittleEndian2String(strlen($riff_data), 4, false).$riff_data; |
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162 | |
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163 | // Clone getid3 - messing with offsets - better safe than sorry |
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164 | $clone = clone $getid3; |
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165 | |
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166 | // Analyze clone by string |
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167 | $riff = new getid3_riff($clone); |
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168 | $riff->AnalyzeString($riff_data); |
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169 | |
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170 | // Import from clone and destroy |
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171 | $getid3->info['riff'] = $clone->info['riff']; |
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172 | $getid3->warnings($clone->warnings()); |
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173 | unset($clone); |
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174 | } |
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175 | |
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176 | // $getid3->info['avdataoffset'] should be zero to begin with, but just in case it's not, include the addition anyway |
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177 | $getid3->info['avdataend'] = $getid3->info['avdataoffset'] + $getid3->info['la']['footerstart']; |
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178 | $getid3->info['avdataoffset'] = $getid3->info['avdataoffset'] + $offset; |
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179 | |
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180 | $getid3->info['la']['compression_ratio'] = (float)(($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / $getid3->info['la']['uncompressed_size']); |
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181 | $getid3->info['playtime_seconds'] = (float)($getid3->info['la']['samples'] / $getid3->info['la']['sample_rate']) / $getid3->info['la']['channels']; |
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182 | |
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183 | $getid3->info['audio']['bitrate'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8 / $getid3->info['playtime_seconds']; |
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184 | $getid3->info['audio']['bits_per_sample'] = $getid3->info['la']['bits_per_sample']; |
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185 | |
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186 | $getid3->info['audio']['channels'] = $getid3->info['la']['channels']; |
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187 | $getid3->info['audio']['sample_rate'] = (int)$getid3->info['la']['sample_rate']; |
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188 | $getid3->info['audio']['encoder'] = 'LA v'.$getid3->info['la']['version']; |
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189 | |
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190 | return true; |
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191 | } |
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192 | |
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193 | } |
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194 | |
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195 | |
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196 | ?> |
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