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<?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 <info�getid3*org> |
// | Allan Hansen <ah�artemis*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;
}
}
?>
|
