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