<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.vqf.php //
// module for analyzing VQF audio files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_vqf extends getid3_handler
{
function Analyze() {
$info = &$this->getid3->info;
// based loosely on code from TTwinVQ by Jurgen Faul <jfaulØgmx*de>
// http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html
$info['fileformat'] = 'vqf';
$info['audio']['dataformat'] = 'vqf';
$info['audio']['bitrate_mode'] = 'cbr';
$info['audio']['lossless'] = false;
// shortcut
$info['vqf']['raw'] = array();
$thisfile_vqf = &$info['vqf'];
$thisfile_vqf_raw = &$thisfile_vqf['raw'];
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
$VQFheaderData = fread($this->getid3->fp, 16);
$offset = 0;
$thisfile_vqf_raw['header_tag'] = substr($VQFheaderData, $offset, 4);
$magic = 'TWIN';
if ($thisfile_vqf_raw['header_tag'] != $magic) {
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_vqf_raw['header_tag']).'"';
unset($info['vqf']);
unset($info['fileformat']);
return false;
}
$offset += 4;
$thisfile_vqf_raw['version'] = substr($VQFheaderData, $offset, 8);
$offset += 8;
$thisfile_vqf_raw['size'] = getid3_lib::BigEndian2Int(substr($VQFheaderData, $offset, 4));
$offset += 4;
while (ftell($this->getid3->fp) < $info['avdataend']) {
$ChunkBaseOffset = ftell($this->getid3->fp);
$chunkoffset = 0;
$ChunkData = fread($this->getid3->fp, 8);
$ChunkName = substr($ChunkData, $chunkoffset, 4);
if ($ChunkName == 'DATA') {
$info['avdataoffset'] = $ChunkBaseOffset;
break;
}
$chunkoffset += 4;
$ChunkSize = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
$chunkoffset += 4;
if ($ChunkSize > ($info['avdataend'] - ftell($this->getid3->fp))) {
$info['error'][] = 'Invalid chunk size ('.$ChunkSize.') for chunk "'.$ChunkName.'" at offset '.$ChunkBaseOffset;
break;
}
if ($ChunkSize > 0) {
$ChunkData .= fread($this->getid3->fp, $ChunkSize);
}
switch ($ChunkName) {
case 'COMM':
// shortcut
$thisfile_vqf['COMM'] = array();
$thisfile_vqf_COMM = &$thisfile_vqf['COMM'];
$thisfile_vqf_COMM['channel_mode'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
$chunkoffset += 4;
$thisfile_vqf_COMM['bitrate'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
$chunkoffset += 4;
$thisfile_vqf_COMM['sample_rate'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
$chunkoffset += 4;
$thisfile_vqf_COMM['security_level'] = getid3_lib::BigEndian2Int(substr($ChunkData, $chunkoffset, 4));
$chunkoffset += 4;
$info['audio']['channels'] = $thisfile_vqf_COMM['channel_mode'] + 1;
$info['audio']['sample_rate'] = $this->VQFchannelFrequencyLookup($thisfile_vqf_COMM['sample_rate']);
$info['audio']['bitrate'] = $thisfile_vqf_COMM['bitrate'] * 1000;
$info['audio']['encoder_options'] = 'CBR' . ceil($info['audio']['bitrate']/1000);
if ($info['audio']['bitrate'] == 0) {
$info['error'][] = 'Corrupt VQF file: bitrate_audio == zero';
return false;
}
break;
case 'NAME':
case 'AUTH':
case '(c) ':
case 'FILE':
case 'COMT':
case 'ALBM':
$thisfile_vqf['comments'][$this->VQFcommentNiceNameLookup($ChunkName)][] = trim(substr($ChunkData, 8));
break;
case 'DSIZ':
$thisfile_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($ChunkData, 8, 4));
break;
default:
$info['warning'][] = 'Unhandled chunk type "'.$ChunkName.'" at offset '.$ChunkBaseOffset;
break;
}
}
$info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['audio']['bitrate'];
if (isset($thisfile_vqf['DSIZ']) && (($thisfile_vqf['DSIZ'] != ($info['avdataend'] - $info['avdataoffset'] - strlen('DATA'))))) {
switch ($thisfile_vqf['DSIZ']) {
case 0:
case 1:
$info['warning'][] = 'Invalid DSIZ value "'.$thisfile_vqf['DSIZ'].'". This is known to happen with VQF files encoded by Ahead Nero, and seems to be its way of saying this is TwinVQF v'.($thisfile_vqf['DSIZ'] + 1).'.0';
$info['audio']['encoder'] = 'Ahead Nero';
break;
default:
$info['warning'][] = 'Probable corrupted file - should be '.$thisfile_vqf['DSIZ'].' bytes, actually '.($info['avdataend'] - $info['avdataoffset'] - strlen('DATA'));
break;
}
}
return true;
}
function VQFchannelFrequencyLookup($frequencyid) {
static $VQFchannelFrequencyLookup = array(
11 => 11025,
22 => 22050,
44 => 44100
);
return (isset($VQFchannelFrequencyLookup[$frequencyid]) ? $VQFchannelFrequencyLookup[$frequencyid] : $frequencyid * 1000);
}
function VQFcommentNiceNameLookup($shortname) {
static $VQFcommentNiceNameLookup = array(
'NAME' => 'title',
'AUTH' => 'artist',
'(c) ' => 'copyright',
'FILE' => 'filename',
'COMT' => 'comment',
'ALBM' => 'album'
);
return (isset($VQFcommentNiceNameLookup[$shortname]) ? $VQFcommentNiceNameLookup[$shortname] : $shortname);
}
}
?>
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