| <Website> | getID3 |  |
|
| Size: | 3912 |
| Storage flags: | strip |
<?php
class getid3_shorten extends getid3_handler
{
public function Analyze() {
$info = &$this->getid3->info;
$this->fseek($info['avdataoffset']);
$ShortenHeader = $this->fread(8);
$magic = 'ajkg';
if (substr($ShortenHeader, 0, 4) != $magic) {
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($ShortenHeader, 0, 4)).'"';
return false;
}
$info['fileformat'] = 'shn';
$info['audio']['dataformat'] = 'shn';
$info['audio']['lossless'] = true;
$info['audio']['bitrate_mode'] = 'vbr';
$info['shn']['version'] = getid3_lib::LittleEndian2Int(substr($ShortenHeader, 4, 1));
$this->fseek($info['avdataend'] - 12);
$SeekTableSignatureTest = $this->fread(12);
$info['shn']['seektable']['present'] = (bool) (substr($SeekTableSignatureTest, 4, 8) == 'SHNAMPSK');
if ($info['shn']['seektable']['present']) {
$info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($SeekTableSignatureTest, 0, 4));
$info['shn']['seektable']['offset'] = $info['avdataend'] - $info['shn']['seektable']['length'];
$this->fseek($info['shn']['seektable']['offset']);
$SeekTableMagic = $this->fread(4);
$magic = 'SEEK';
if ($SeekTableMagic != $magic) {
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['shn']['seektable']['offset'].', found "'.getid3_lib::PrintHexBytes($SeekTableMagic).'"';
return false;
} else {
$SeekTableData = $this->fread($info['shn']['seektable']['length'] - 16);
$info['shn']['seektable']['entry_count'] = floor(strlen($SeekTableData) / 80);
}
}
if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
$info['error'][] = 'PHP running in Safe Mode - backtick operator not available, cannot run shntool to analyze Shorten files';
return false;
}
if (GETID3_OS_ISWINDOWS) {
$RequiredFiles = array('shorten.exe', 'cygwin1.dll', 'head.exe');
foreach ($RequiredFiles as $required_file) {
if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
$info['error'][] = GETID3_HELPERAPPSDIR.$required_file.' does not exist';
return false;
}
}
$commandline = GETID3_HELPERAPPSDIR.'shorten.exe -x "'.$info['filenamepath'].'" - | '.GETID3_HELPERAPPSDIR.'head.exe -c 64';
$commandline = str_replace('/', '\\', $commandline);
} else {
static $shorten_present;
if (!isset($shorten_present)) {
$shorten_present = file_exists('/usr/local/bin/shorten') || `which shorten`;
}
if (!$shorten_present) {
$info['error'][] = 'shorten binary was not found in path or /usr/local/bin';
return false;
}
$commandline = (file_exists('/usr/local/bin/shorten') ? '/usr/local/bin/' : '' ) . 'shorten -x '.escapeshellarg($info['filenamepath']).' - | head -c 64';
}
$output = `$commandline`;
if (!empty($output) && (substr($output, 12, 4) == 'fmt ')) {
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
$fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));
$DecodedWAVFORMATEX = getid3_riff::parseWAVEFORMATex(substr($output, 20, $fmt_size));
$info['audio']['channels'] = $DecodedWAVFORMATEX['channels'];
$info['audio']['bits_per_sample'] = $DecodedWAVFORMATEX['bits_per_sample'];
$info['audio']['sample_rate'] = $DecodedWAVFORMATEX['sample_rate'];
if (substr($output, 20 + $fmt_size, 4) == 'data') {
$info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $DecodedWAVFORMATEX['raw']['nAvgBytesPerSec'];
} else {
$info['error'][] = 'shorten failed to decode DATA chunk to expected location, cannot determine playtime';
return false;
}
$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) / $info['playtime_seconds']) * 8;
} else {
$info['error'][] = 'shorten failed to decode file to WAV for parsing';
return false;
}
return true;
}
}