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Diffstat (limited to 'modules/getid3/module.audio.shorten.php')
| -rw-r--r-- | modules/getid3/module.audio.shorten.php | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/modules/getid3/module.audio.shorten.php b/modules/getid3/module.audio.shorten.php new file mode 100644 index 00000000..2d2c04fa --- /dev/null +++ b/modules/getid3/module.audio.shorten.php @@ -0,0 +1,121 @@ +<?php +// +----------------------------------------------------------------------+ +// | PHP version 5 | +// +----------------------------------------------------------------------+ +// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | +// +----------------------------------------------------------------------+ +// | This source file is subject to version 2 of the GPL license, | +// | that is bundled with this package in the file license.txt and is | +// | available through the world-wide-web at the following url: | +// | http://www.gnu.org/copyleft/gpl.html | +// +----------------------------------------------------------------------+ +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | +// +----------------------------------------------------------------------+ +// | Authors: James Heinrich <infoØgetid3*org> | +// | Allan Hansen <ahØartemis*dk> | +// +----------------------------------------------------------------------+ +// | module.audio.shorten.php | +// | Module for analyzing Shorten Audio files | +// | dependencies: module.audio-video.riff.php | +// +----------------------------------------------------------------------+ +// +// $Id: module.audio.shorten.php,v 1.5 2006/12/03 19:28:18 ah Exp $ + + + +class getid3_shorten extends getid3_handler +{ + + public function __construct(getID3 $getid3) { + + parent::__construct($getid3); + + if ((bool)ini_get('safe_mode')) { + throw new getid3_exception('PHP running in Safe Mode - backtick operator not available, cannot analyze Shorten files.'); + } + + if (!`head --version`) { + throw new getid3_exception('head[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.'); + } + + if (!`shorten -l`) { + throw new getid3_exception('shorten[.exe] binary not found in path. UNIX: typically /usr/bin. Windows: typically c:\windows\system32.'); + } + } + + + public function Analyze() { + + $getid3 = $this->getid3; + + $getid3->include_module('audio-video.riff'); + + fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); + + $shn_header = fread($getid3->fp, 8); + + // Magic bytes: "ajkg" + + $getid3->info['fileformat'] = 'shn'; + $getid3->info['audio']['dataformat'] = 'shn'; + $getid3->info['audio']['lossless'] = true; + $getid3->info['audio']['bitrate_mode'] = 'vbr'; + + $getid3->info['shn']['version'] = getid3_lib::LittleEndian2Int($shn_header{4}); + + fseek($getid3->fp, $getid3->info['avdataend'] - 12, SEEK_SET); + + $seek_table_signature_test = fread($getid3->fp, 12); + + $getid3->info['shn']['seektable']['present'] = (bool)(substr($seek_table_signature_test, 4, 8) == 'SHNAMPSK'); + if ($getid3->info['shn']['seektable']['present']) { + + $getid3->info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($seek_table_signature_test, 0, 4)); + $getid3->info['shn']['seektable']['offset'] = $getid3->info['avdataend'] - $getid3->info['shn']['seektable']['length']; + fseek($getid3->fp, $getid3->info['shn']['seektable']['offset'], SEEK_SET); + $seek_table_magic = fread($getid3->fp, 4); + + if ($seek_table_magic != 'SEEK') { + + throw new getid3_exception('Expecting "SEEK" at offset '.$getid3->info['shn']['seektable']['offset'].', found "'.$seek_table_magic.'"'); + } + + $seek_table_data = fread($getid3->fp, $getid3->info['shn']['seektable']['length'] - 16); + $getid3->info['shn']['seektable']['entry_count'] = floor(strlen($seek_table_data) / 80); + } + + $commandline = 'shorten -x '.escapeshellarg(realpath($getid3->filename)).' - | head -c 64'; + $output = `$commandline`; + + if (@$output && substr($output, 12, 4) == 'fmt ') { + + $fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4)); + $decoded_wav_format_ex = getid3_riff::RIFFparseWAVEFORMATex(substr($output, 20, $fmt_size)); + + $getid3->info['audio']['channels'] = $decoded_wav_format_ex['channels']; + $getid3->info['audio']['bits_per_sample'] = $decoded_wav_format_ex['bits_per_sample']; + $getid3->info['audio']['sample_rate'] = $decoded_wav_format_ex['sample_rate']; + + if (substr($output, 20 + $fmt_size, 4) == 'data') { + + $getid3->info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $decoded_wav_format_ex['raw']['nAvgBytesPerSec']; + + } else { + + throw new getid3_exception('shorten failed to decode DATA chunk to expected location, cannot determine playtime'); + } + + $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / $getid3->info['playtime_seconds']) * 8; + + } else { + + throw new getid3_exception('shorten failed to decode file to WAV for parsing'); + return false; + } + + return true; + } + +} + +?>
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