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.shorten.php | |
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18 | // | Module for analyzing Shorten Audio 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.shorten.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_shorten extends getid3_handler |
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27 | { |
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28 | |
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29 | public function __construct(getID3 $getid3) { |
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30 | |
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31 | parent::__construct($getid3); |
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32 | |
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33 | if ((bool)ini_get('safe_mode')) { |
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34 | throw new getid3_exception('PHP running in Safe Mode - backtick operator not available, cannot analyze Shorten files.'); |
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35 | } |
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36 | |
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37 | if (!`head --version`) { |
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38 | throw new getid3_exception('head[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.'); |
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39 | } |
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40 | |
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41 | if (!`shorten -l`) { |
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42 | throw new getid3_exception('shorten[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.'); |
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43 | } |
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44 | } |
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45 | |
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46 | |
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47 | public function Analyze() { |
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48 | |
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49 | $getid3 = $this->getid3; |
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50 | |
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51 | $getid3->include_module('audio-video.riff'); |
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52 | |
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53 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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54 | |
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55 | $shn_header = fread($getid3->fp, 8); |
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56 | |
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57 | // Magic bytes: "ajkg" |
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58 | |
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59 | $getid3->info['fileformat'] = 'shn'; |
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60 | $getid3->info['audio']['dataformat'] = 'shn'; |
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61 | $getid3->info['audio']['lossless'] = true; |
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62 | $getid3->info['audio']['bitrate_mode'] = 'vbr'; |
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63 | |
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64 | $getid3->info['shn']['version'] = getid3_lib::LittleEndian2Int($shn_header{4}); |
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65 | |
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66 | fseek($getid3->fp, $getid3->info['avdataend'] - 12, SEEK_SET); |
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67 | |
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68 | $seek_table_signature_test = fread($getid3->fp, 12); |
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69 | |
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70 | $getid3->info['shn']['seektable']['present'] = (bool)(substr($seek_table_signature_test, 4, 8) == 'SHNAMPSK'); |
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71 | if ($getid3->info['shn']['seektable']['present']) { |
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72 | |
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73 | $getid3->info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($seek_table_signature_test, 0, 4)); |
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74 | $getid3->info['shn']['seektable']['offset'] = $getid3->info['avdataend'] - $getid3->info['shn']['seektable']['length']; |
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75 | fseek($getid3->fp, $getid3->info['shn']['seektable']['offset'], SEEK_SET); |
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76 | $seek_table_magic = fread($getid3->fp, 4); |
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77 | |
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78 | if ($seek_table_magic != 'SEEK') { |
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79 | |
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80 | throw new getid3_exception('Expecting "SEEK" at offset '.$getid3->info['shn']['seektable']['offset'].', found "'.$seek_table_magic.'"'); |
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81 | } |
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82 | |
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83 | $seek_table_data = fread($getid3->fp, $getid3->info['shn']['seektable']['length'] - 16); |
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84 | $getid3->info['shn']['seektable']['entry_count'] = floor(strlen($seek_table_data) / 80); |
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85 | } |
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86 | |
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87 | $commandline = 'shorten -x '.escapeshellarg(realpath($getid3->filename)).' - | head -c 64'; |
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88 | $output = `$commandline`; |
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89 | |
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90 | if (@$output && substr($output, 12, 4) == 'fmt ') { |
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91 | |
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92 | $fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4)); |
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93 | $decoded_wav_format_ex = getid3_riff::RIFFparseWAVEFORMATex(substr($output, 20, $fmt_size)); |
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94 | |
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95 | $getid3->info['audio']['channels'] = $decoded_wav_format_ex['channels']; |
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96 | $getid3->info['audio']['bits_per_sample'] = $decoded_wav_format_ex['bits_per_sample']; |
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97 | $getid3->info['audio']['sample_rate'] = $decoded_wav_format_ex['sample_rate']; |
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98 | |
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99 | if (substr($output, 20 + $fmt_size, 4) == 'data') { |
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100 | |
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101 | $getid3->info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $decoded_wav_format_ex['raw']['nAvgBytesPerSec']; |
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102 | |
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103 | } else { |
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104 | |
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105 | throw new getid3_exception('shorten failed to decode DATA chunk to expected location, cannot determine playtime'); |
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106 | } |
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107 | |
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108 | $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / $getid3->info['playtime_seconds']) * 8; |
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109 | |
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110 | } else { |
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111 | |
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112 | throw new getid3_exception('shorten failed to decode file to WAV for parsing'); |
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113 | return false; |
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114 | } |
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115 | |
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116 | return true; |
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117 | } |
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118 | |
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119 | } |
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120 | |
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121 | ?> |
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