Mercurial > judyates
view e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.au.php @ 20:1038db2374ec judyates
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| author | Robert McIntyre <rlm@mit.edu> |
|---|---|
| date | Sun, 08 Sep 2013 00:47:09 -0400 |
| parents | 3f6b44aa6b35 |
| children |
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1 <?php2 // +----------------------------------------------------------------------+3 // | PHP version 5 |4 // +----------------------------------------------------------------------+5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |6 // +----------------------------------------------------------------------+7 // | This source file is subject to version 2 of the GPL license, |8 // | that is bundled with this package in the file license.txt and is |9 // | available through the world-wide-web at the following url: |10 // | http://www.gnu.org/copyleft/gpl.html |11 // +----------------------------------------------------------------------+12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |13 // +----------------------------------------------------------------------+14 // | Authors: James Heinrich <infoØgetid3*org> |15 // | Allan Hansen <ahØartemis*dk> |16 // +----------------------------------------------------------------------+17 // | module.audio.au.php |18 // | module for analyzing AU files |19 // | dependencies: NONE |20 // +----------------------------------------------------------------------+21 //22 // $Id: module.audio.au.php,v 1.2 2006/11/02 10:48:01 ah Exp $26 class getid3_au extends getid3_handler27 {29 public function Analyze() {31 $getid3 = $this->getid3;33 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);34 $au_header = fread($getid3->fp, 8);36 // Magic bytes: .snd38 $getid3->info['au'] = array ();39 $info_au = &$getid3->info['au'];41 $getid3->info['fileformat'] = 'au';42 $getid3->info['audio']['dataformat'] = 'au';43 $getid3->info['audio']['bitrate_mode'] = 'cbr';44 $info_au['encoding'] = 'ISO-8859-1';46 $info_au['header_length'] = getid3_lib::BigEndian2Int(substr($au_header, 4, 4));47 $au_header .= fread($getid3->fp, $info_au['header_length'] - 8);48 $getid3->info['avdataoffset'] += $info_au['header_length'];50 getid3_lib::ReadSequence('BigEndian2Int', $info_au, $au_header, 8,51 array (52 'data_size' => 4,53 'data_format_id'=> 4,54 'sample_rate' => 4,55 'channels' => 456 )57 );58 $info_au['comments']['comment'][] = trim(substr($au_header, 24));60 $info_au['data_format'] = getid3_au::AUdataFormatNameLookup($info_au['data_format_id']);61 $info_au['used_bits_per_sample'] = getid3_au::AUdataFormatUsedBitsPerSampleLookup($info_au['data_format_id']);62 if ($info_au['bits_per_sample'] = getid3_au::AUdataFormatBitsPerSampleLookup($info_au['data_format_id'])) {63 $getid3->info['audio']['bits_per_sample'] = $info_au['bits_per_sample'];64 } else {65 unset($info_au['bits_per_sample']);66 }68 $getid3->info['audio']['sample_rate'] = $info_au['sample_rate'];69 $getid3->info['audio']['channels'] = $info_au['channels'];71 if (($getid3->info['avdataoffset'] + $info_au['data_size']) > $getid3->info['avdataend']) {72 $getid3->warning('Possible truncated file - expecting "'.$info_au['data_size'].'" bytes of audio data, only found '.($getid3->info['avdataend'] - $getid3->info['avdataoffset']).' bytes"');73 }75 $getid3->info['playtime_seconds'] = $info_au['data_size'] / ($info_au['sample_rate'] * $info_au['channels'] * ($info_au['used_bits_per_sample'] / 8));76 $getid3->info['audio']['bitrate'] = ($info_au['data_size'] * 8) / $getid3->info['playtime_seconds'];78 return true;79 }83 public static function AUdataFormatNameLookup($id) {85 static $lookup = array (86 0 => 'unspecified format',87 1 => '8-bit mu-law',88 2 => '8-bit linear',89 3 => '16-bit linear',90 4 => '24-bit linear',91 5 => '32-bit linear',92 6 => 'floating-point',93 7 => 'double-precision float',94 8 => 'fragmented sampled data',95 9 => 'SUN_FORMAT_NESTED',96 10 => 'DSP program',97 11 => '8-bit fixed-point',98 12 => '16-bit fixed-point',99 13 => '24-bit fixed-point',100 14 => '32-bit fixed-point',102 16 => 'non-audio display data',103 17 => 'SND_FORMAT_MULAW_SQUELCH',104 18 => '16-bit linear with emphasis',105 19 => '16-bit linear with compression',106 20 => '16-bit linear with emphasis + compression',107 21 => 'Music Kit DSP commands',108 22 => 'SND_FORMAT_DSP_COMMANDS_SAMPLES',109 23 => 'CCITT g.721 4-bit ADPCM',110 24 => 'CCITT g.722 ADPCM',111 25 => 'CCITT g.723 3-bit ADPCM',112 26 => 'CCITT g.723 5-bit ADPCM',113 27 => 'A-Law 8-bit'114 );116 return (isset($lookup[$id]) ? $lookup[$id] : false);117 }121 public static function AUdataFormatBitsPerSampleLookup($id) {123 static $lookup = array (124 1 => 8,125 2 => 8,126 3 => 16,127 4 => 24,128 5 => 32,129 6 => 32,130 7 => 64,132 11 => 8,133 12 => 16,134 13 => 24,135 14 => 32,137 18 => 16,138 19 => 16,139 20 => 16,141 23 => 16,143 25 => 16,144 26 => 16,145 27 => 8146 );147 return (isset($lookup[$id]) ? $lookup[$id] : false);148 }152 public static function AUdataFormatUsedBitsPerSampleLookup($id) {154 static $lookup = array (155 1 => 8,156 2 => 8,157 3 => 16,158 4 => 24,159 5 => 32,160 6 => 32,161 7 => 64,163 11 => 8,164 12 => 16,165 13 => 24,166 14 => 32,168 18 => 16,169 19 => 16,170 20 => 16,172 23 => 4,174 25 => 3,175 26 => 5,176 27 => 8,177 );178 return (isset($lookup[$id]) ? $lookup[$id] : false);179 }181 }184 ?>