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annotate e2gallerypro/e2upload/Backend/Assets/getid3/module.audio.shorten.php @ 25:6a3d04638a89 judyates

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author Robert McIntyre <rlm@mit.edu>
date Sat, 19 Jul 2014 14:35:52 -0400
parents 3f6b44aa6b35
children
rev   line source
rlm@3 1 <?php
rlm@3 2 // +----------------------------------------------------------------------+
rlm@3 3 // | PHP version 5 |
rlm@3 4 // +----------------------------------------------------------------------+
rlm@3 5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
rlm@3 6 // +----------------------------------------------------------------------+
rlm@3 7 // | This source file is subject to version 2 of the GPL license, |
rlm@3 8 // | that is bundled with this package in the file license.txt and is |
rlm@3 9 // | available through the world-wide-web at the following url: |
rlm@3 10 // | http://www.gnu.org/copyleft/gpl.html |
rlm@3 11 // +----------------------------------------------------------------------+
rlm@3 12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
rlm@3 13 // +----------------------------------------------------------------------+
rlm@3 14 // | Authors: James Heinrich <infoØgetid3*org> |
rlm@3 15 // | Allan Hansen <ahØartemis*dk> |
rlm@3 16 // +----------------------------------------------------------------------+
rlm@3 17 // | module.audio.shorten.php |
rlm@3 18 // | Module for analyzing Shorten Audio files |
rlm@3 19 // | dependencies: module.audio-video.riff.php |
rlm@3 20 // +----------------------------------------------------------------------+
rlm@3 21 //
rlm@3 22 // $Id: module.audio.shorten.php,v 1.5 2006/12/03 19:28:18 ah Exp $
rlm@3 23
rlm@3 24
rlm@3 25
rlm@3 26 class getid3_shorten extends getid3_handler
rlm@3 27 {
rlm@3 28
rlm@3 29 public function __construct(getID3 $getid3) {
rlm@3 30
rlm@3 31 parent::__construct($getid3);
rlm@3 32
rlm@3 33 if ((bool)ini_get('safe_mode')) {
rlm@3 34 throw new getid3_exception('PHP running in Safe Mode - backtick operator not available, cannot analyze Shorten files.');
rlm@3 35 }
rlm@3 36
rlm@3 37 if (!`head --version`) {
rlm@3 38 throw new getid3_exception('head[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.');
rlm@3 39 }
rlm@3 40
rlm@3 41 if (!`shorten -l`) {
rlm@3 42 throw new getid3_exception('shorten[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.');
rlm@3 43 }
rlm@3 44 }
rlm@3 45
rlm@3 46
rlm@3 47 public function Analyze() {
rlm@3 48
rlm@3 49 $getid3 = $this->getid3;
rlm@3 50
rlm@3 51 $getid3->include_module('audio-video.riff');
rlm@3 52
rlm@3 53 fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
rlm@3 54
rlm@3 55 $shn_header = fread($getid3->fp, 8);
rlm@3 56
rlm@3 57 // Magic bytes: "ajkg"
rlm@3 58
rlm@3 59 $getid3->info['fileformat'] = 'shn';
rlm@3 60 $getid3->info['audio']['dataformat'] = 'shn';
rlm@3 61 $getid3->info['audio']['lossless'] = true;
rlm@3 62 $getid3->info['audio']['bitrate_mode'] = 'vbr';
rlm@3 63
rlm@3 64 $getid3->info['shn']['version'] = getid3_lib::LittleEndian2Int($shn_header{4});
rlm@3 65
rlm@3 66 fseek($getid3->fp, $getid3->info['avdataend'] - 12, SEEK_SET);
rlm@3 67
rlm@3 68 $seek_table_signature_test = fread($getid3->fp, 12);
rlm@3 69
rlm@3 70 $getid3->info['shn']['seektable']['present'] = (bool)(substr($seek_table_signature_test, 4, 8) == 'SHNAMPSK');
rlm@3 71 if ($getid3->info['shn']['seektable']['present']) {
rlm@3 72
rlm@3 73 $getid3->info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($seek_table_signature_test, 0, 4));
rlm@3 74 $getid3->info['shn']['seektable']['offset'] = $getid3->info['avdataend'] - $getid3->info['shn']['seektable']['length'];
rlm@3 75 fseek($getid3->fp, $getid3->info['shn']['seektable']['offset'], SEEK_SET);
rlm@3 76 $seek_table_magic = fread($getid3->fp, 4);
rlm@3 77
rlm@3 78 if ($seek_table_magic != 'SEEK') {
rlm@3 79
rlm@3 80 throw new getid3_exception('Expecting "SEEK" at offset '.$getid3->info['shn']['seektable']['offset'].', found "'.$seek_table_magic.'"');
rlm@3 81 }
rlm@3 82
rlm@3 83 $seek_table_data = fread($getid3->fp, $getid3->info['shn']['seektable']['length'] - 16);
rlm@3 84 $getid3->info['shn']['seektable']['entry_count'] = floor(strlen($seek_table_data) / 80);
rlm@3 85 }
rlm@3 86
rlm@3 87 $commandline = 'shorten -x '.escapeshellarg(realpath($getid3->filename)).' - | head -c 64';
rlm@3 88 $output = `$commandline`;
rlm@3 89
rlm@3 90 if (@$output && substr($output, 12, 4) == 'fmt ') {
rlm@3 91
rlm@3 92 $fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));
rlm@3 93 $decoded_wav_format_ex = getid3_riff::RIFFparseWAVEFORMATex(substr($output, 20, $fmt_size));
rlm@3 94
rlm@3 95 $getid3->info['audio']['channels'] = $decoded_wav_format_ex['channels'];
rlm@3 96 $getid3->info['audio']['bits_per_sample'] = $decoded_wav_format_ex['bits_per_sample'];
rlm@3 97 $getid3->info['audio']['sample_rate'] = $decoded_wav_format_ex['sample_rate'];
rlm@3 98
rlm@3 99 if (substr($output, 20 + $fmt_size, 4) == 'data') {
rlm@3 100
rlm@3 101 $getid3->info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $decoded_wav_format_ex['raw']['nAvgBytesPerSec'];
rlm@3 102
rlm@3 103 } else {
rlm@3 104
rlm@3 105 throw new getid3_exception('shorten failed to decode DATA chunk to expected location, cannot determine playtime');
rlm@3 106 }
rlm@3 107
rlm@3 108 $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / $getid3->info['playtime_seconds']) * 8;
rlm@3 109
rlm@3 110 } else {
rlm@3 111
rlm@3 112 throw new getid3_exception('shorten failed to decode file to WAV for parsing');
rlm@3 113 return false;
rlm@3 114 }
rlm@3 115
rlm@3 116 return true;
rlm@3 117 }
rlm@3 118
rlm@3 119 }
rlm@3 120
rlm@3 121 ?>