131 lines
5.6 KiB
PHP
131 lines
5.6 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <getid3@users.sourceforge.net> //
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// available at http://getid3.sourceforge.net ///
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/////////////////////////////////////////////////////////////////
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// //
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// getid3.la.php - part of getID3() //
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// See getid3.readme.txt for more details //
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// //
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/////////////////////////////////////////////////////////////////
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function getLAHeaderFilepointer(&$fd, &$ThisFileInfo) {
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$offset = 0;
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$rawdata = fread($fd, FREAD_BUFFER_SIZE);
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switch (substr($rawdata, $offset, 4)) {
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case 'LA02':
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case 'LA03':
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$ThisFileInfo['fileformat'] = 'la';
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$ThisFileInfo['audio']['dataformat'] = 'la';
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$ThisFileInfo['la']['version_major'] = (int) substr($rawdata, $offset + 2, 1);
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$ThisFileInfo['la']['version_minor'] = (int) substr($rawdata, $offset + 3, 1);
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$ThisFileInfo['la']['version'] = (float) $ThisFileInfo['la']['version_major'] + ($ThisFileInfo['la']['version_minor'] / 10);
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$offset += 4;
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$ThisFileInfo['la']['uncompressed_size'] = LittleEndian2Int(substr($rawdata, $offset, 4));
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$offset += 4;
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if ($ThisFileInfo['la']['uncompressed_size'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt LA file: uncompressed_size == zero';
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return false;
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}
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$WAVEchunk = substr($rawdata, $offset, 4);
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if ($WAVEchunk !== 'WAVE') {
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$ThisFileInfo['error'] .= "\n".'Expected "WAVE" ('.PrintHexBytes('WAVE').') at offset '.$offset.', found "'.$WAVEchunk.'" ('.PrintHexBytes($WAVEchunk).') instead.';
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return false;
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}
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$offset += 4;
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$ThisFileInfo['la']['format_size'] = 24;
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if ($ThisFileInfo['la']['version'] > 0.2) {
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$ThisFileInfo['la']['format_size'] = LittleEndian2Int(substr($rawdata, $offset, 4));
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$ThisFileInfo['la']['header_size'] = 49 + $ThisFileInfo['la']['format_size'] - 24;
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$offset += 4;
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} else {
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// version two didn't support additional data blocks
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$ThisFileInfo['la']['header_size'] = 41;
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}
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$fmt_chunk = substr($rawdata, $offset, 4);
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if ($fmt_chunk !== 'fmt ') {
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$ThisFileInfo['error'] .= "\n".'Expected "fmt " ('.PrintHexBytes('fmt ').') at offset '.$offset.', found "'.$fmt_chunk.'" ('.PrintHexBytes($fmt_chunk).') instead.';
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return false;
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}
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$offset += 4;
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$fmt_size = LittleEndian2Int(substr($rawdata, $offset, 4));
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$offset += 4;
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$ThisFileInfo['la']['format_raw'] = LittleEndian2Int(substr($rawdata, $offset, 2));
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$offset += 2;
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$ThisFileInfo['la']['channels'] = LittleEndian2Int(substr($rawdata, $offset, 2));
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$offset += 2;
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if ($ThisFileInfo['la']['channels'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt LA file: channels == zero';
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return false;
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}
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$ThisFileInfo['la']['sample_rate'] = LittleEndian2Int(substr($rawdata, $offset, 4));
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$offset += 4;
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if ($ThisFileInfo['la']['sample_rate'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt LA file: sample_rate == zero';
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return false;
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}
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$ThisFileInfo['la']['bytes_per_second'] = LittleEndian2Int(substr($rawdata, $offset, 4));
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$offset += 4;
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$ThisFileInfo['la']['bytes_per_sample'] = LittleEndian2Int(substr($rawdata, $offset, 2));
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$offset += 2;
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$ThisFileInfo['la']['bits_per_sample'] = LittleEndian2Int(substr($rawdata, $offset, 2));
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$offset += 2;
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$ThisFileInfo['la']['samples'] = LittleEndian2Int(substr($rawdata, $offset, 4));
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$offset += 4;
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$ThisFileInfo['la']['seekable'] = (bool) LittleEndian2Int(substr($rawdata, $offset, 1));
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$offset += 1;
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$ThisFileInfo['la']['original_crc'] = LittleEndian2Int(substr($rawdata, $offset, 4));
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$offset += 4;
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require_once(GETID3_INCLUDEPATH.'getid3.riff.php');
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$ThisFileInfo['la']['codec'] = RIFFwFormatTagLookup($ThisFileInfo['la']['format_raw']);
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$ThisFileInfo['la']['compression_ratio'] = (float) (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $ThisFileInfo['la']['uncompressed_size']);
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$ThisFileInfo['playtime_seconds'] = (float) ($ThisFileInfo['la']['samples'] / $ThisFileInfo['la']['sample_rate']) / $ThisFileInfo['la']['channels'];
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if ($ThisFileInfo['playtime_seconds'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt LA file: playtime_seconds == zero';
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return false;
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}
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// add size of file header to avdataoffset - calc bitrate correctly + MD5 data
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$ThisFileInfo['avdataoffset'] += $ThisFileInfo['la']['header_size'];
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$ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['playtime_seconds'];
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$ThisFileInfo['audio']['codec'] = $ThisFileInfo['la']['codec'];
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$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['la']['bits_per_sample'];
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break;
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default:
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if (substr($rawdata, $offset, 2) == 'LA') {
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$ThisFileInfo['error'] .= "\n".'This version of getID3() (v'.GETID3VERSION.') doesn\'t support LA version '.substr($rawdata, $offset + 2, 1).'.'.substr($rawdata, $offset + 3, 1).' which this appears to be - check http://getid3.sourceforge.net for updates.';
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} else {
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$ThisFileInfo['error'] .= "\n".'Not a LA (Lossless-Audio) file';
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}
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return false;
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break;
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}
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$ThisFileInfo['audio']['channels'] = $ThisFileInfo['la']['channels'];
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$ThisFileInfo['audio']['sample_rate'] = (int) $ThisFileInfo['la']['sample_rate'];
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$ThisFileInfo['audio']['encoder'] = (string) $ThisFileInfo['la']['version'];
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return true;
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}
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?>
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