112 lines
8.0 KiB
PHP
112 lines
8.0 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.monkey.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 getMonkeysAudioHeaderFilepointer(&$fd, &$ThisFileInfo) {
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// based loosely on code from TMonkey by Jurgen Faul
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// jfaul@gmx.de http://jfaul.de/atl
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$ThisFileInfo['fileformat'] = 'mac';
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$ThisFileInfo['audio']['dataformat'] = 'mac';
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$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$MACheaderData = fread($fd, 40);
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$ThisFileInfo['monkeys_audio']['raw']['header_tag'] = substr($MACheaderData, 0, 4);
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$ThisFileInfo['monkeys_audio']['raw']['nVersion'] = LittleEndian2Int(substr($MACheaderData, 4, 2));
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$ThisFileInfo['monkeys_audio']['raw']['nCompressionLevel'] = LittleEndian2Int(substr($MACheaderData, 6, 2));
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$ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] = LittleEndian2Int(substr($MACheaderData, 8, 2));
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$ThisFileInfo['monkeys_audio']['raw']['nChannels'] = LittleEndian2Int(substr($MACheaderData, 10, 2));
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$ThisFileInfo['monkeys_audio']['raw']['nSampleRate'] = LittleEndian2Int(substr($MACheaderData, 12, 4));
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$ThisFileInfo['monkeys_audio']['raw']['nWAVHeaderBytes'] = LittleEndian2Int(substr($MACheaderData, 16, 4));
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$ThisFileInfo['monkeys_audio']['raw']['nWAVTerminatingBytes'] = LittleEndian2Int(substr($MACheaderData, 20, 4));
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$ThisFileInfo['monkeys_audio']['raw']['nTotalFrames'] = LittleEndian2Int(substr($MACheaderData, 24, 4));
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$ThisFileInfo['monkeys_audio']['raw']['nFinalFrameSamples'] = LittleEndian2Int(substr($MACheaderData, 28, 4));
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$ThisFileInfo['monkeys_audio']['raw']['nPeakLevel'] = LittleEndian2Int(substr($MACheaderData, 32, 4));
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$ThisFileInfo['monkeys_audio']['raw']['nSeekElements'] = LittleEndian2Int(substr($MACheaderData, 38, 2));
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$ThisFileInfo['monkeys_audio']['flags']['8-bit'] = (bool) ($ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] & 0x0001);
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$ThisFileInfo['monkeys_audio']['flags']['crc-32'] = (bool) ($ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] & 0x0002);
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$ThisFileInfo['monkeys_audio']['flags']['peak_level'] = (bool) ($ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] & 0x0004);
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$ThisFileInfo['monkeys_audio']['flags']['24-bit'] = (bool) ($ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] & 0x0008);
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$ThisFileInfo['monkeys_audio']['flags']['seek_elements'] = (bool) ($ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] & 0x0010);
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$ThisFileInfo['monkeys_audio']['flags']['no_wav_header'] = (bool) ($ThisFileInfo['monkeys_audio']['raw']['nFormatFlags'] & 0x0020);
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$ThisFileInfo['monkeys_audio']['version'] = $ThisFileInfo['monkeys_audio']['raw']['nVersion'] / 1000;
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$ThisFileInfo['monkeys_audio']['compression'] = MonkeyCompressionLevelNameLookup($ThisFileInfo['monkeys_audio']['raw']['nCompressionLevel']);
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$ThisFileInfo['monkeys_audio']['samples_per_frame'] = MonkeySamplesPerFrame($ThisFileInfo['monkeys_audio']['raw']['nVersion'], $ThisFileInfo['monkeys_audio']['raw']['nCompressionLevel']);
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$ThisFileInfo['monkeys_audio']['bits_per_sample'] = ($ThisFileInfo['monkeys_audio']['flags']['24-bit'] ? 24 : ($ThisFileInfo['monkeys_audio']['flags']['8-bit'] ? 8 : 16));
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if ($ThisFileInfo['monkeys_audio']['bits_per_sample'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt MAC file: bits_per_sample == zero';
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return false;
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}
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$ThisFileInfo['monkeys_audio']['channels'] = $ThisFileInfo['monkeys_audio']['raw']['nChannels'];
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$ThisFileInfo['audio']['channels'] = $ThisFileInfo['monkeys_audio']['channels'];
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$ThisFileInfo['monkeys_audio']['sample_rate'] = $ThisFileInfo['monkeys_audio']['raw']['nSampleRate'];
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if ($ThisFileInfo['monkeys_audio']['sample_rate'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt MAC file: frequency == zero';
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return false;
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}
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$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['monkeys_audio']['sample_rate'];
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$ThisFileInfo['monkeys_audio']['peak_level'] = $ThisFileInfo['monkeys_audio']['raw']['nPeakLevel'];
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$ThisFileInfo['monkeys_audio']['peak_ratio'] = $ThisFileInfo['monkeys_audio']['peak_level'] / pow(2, $ThisFileInfo['monkeys_audio']['bits_per_sample'] - 1);
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$ThisFileInfo['monkeys_audio']['frames'] = $ThisFileInfo['monkeys_audio']['raw']['nTotalFrames'];
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$ThisFileInfo['monkeys_audio']['samples'] = (($ThisFileInfo['monkeys_audio']['frames'] - 1) * $ThisFileInfo['monkeys_audio']['samples_per_frame']) + $ThisFileInfo['monkeys_audio']['raw']['nFinalFrameSamples'];
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$ThisFileInfo['monkeys_audio']['playtime'] = $ThisFileInfo['monkeys_audio']['samples'] / $ThisFileInfo['monkeys_audio']['sample_rate'];
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if ($ThisFileInfo['monkeys_audio']['playtime'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt MAC file: playtime == zero';
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return false;
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}
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$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['monkeys_audio']['playtime'];
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$ThisFileInfo['monkeys_audio']['compressed_size'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
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$ThisFileInfo['monkeys_audio']['uncompressed_size'] = $ThisFileInfo['monkeys_audio']['samples'] * $ThisFileInfo['monkeys_audio']['channels'] * ($ThisFileInfo['monkeys_audio']['bits_per_sample'] / 8);
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if ($ThisFileInfo['monkeys_audio']['uncompressed_size'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt MAC file: uncompressed_size == zero';
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return false;
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}
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$ThisFileInfo['monkeys_audio']['compression_ratio'] = $ThisFileInfo['monkeys_audio']['compressed_size'] / ($ThisFileInfo['monkeys_audio']['uncompressed_size'] + $ThisFileInfo['monkeys_audio']['raw']['nWAVHeaderBytes']);
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$ThisFileInfo['monkeys_audio']['bitrate'] = (($ThisFileInfo['monkeys_audio']['samples'] * $ThisFileInfo['monkeys_audio']['channels'] * $ThisFileInfo['monkeys_audio']['bits_per_sample']) / $ThisFileInfo['monkeys_audio']['playtime']) * $ThisFileInfo['monkeys_audio']['compression_ratio'];
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$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['monkeys_audio']['bitrate'];
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// add size of MAC header to avdataoffset - MD5data
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$ThisFileInfo['avdataoffset'] += 40;
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$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['monkeys_audio']['bits_per_sample'];
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$ThisFileInfo['audio']['encoder'] = 'MAC v'.number_format($ThisFileInfo['monkeys_audio']['version'], 2);
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return true;
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}
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function MonkeyCompressionLevelNameLookup($compressionlevel) {
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static $MonkeyCompressionLevelNameLookup = array();
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if (empty($MonkeyCompressionLevelNameLookup)) {
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$MonkeyCompressionLevelNameLookup[0] = 'unknown';
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$MonkeyCompressionLevelNameLookup[1000] = 'fast';
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$MonkeyCompressionLevelNameLookup[2000] = 'normal';
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$MonkeyCompressionLevelNameLookup[3000] = 'high';
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$MonkeyCompressionLevelNameLookup[4000] = 'extra-high';
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$MonkeyCompressionLevelNameLookup[5000] = 'insane'; // thanks Allan Hansen <ah@artemis.dk> (October 6, 2002)
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}
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return (isset($MonkeyCompressionLevelNameLookup[$compressionlevel]) ? $MonkeyCompressionLevelNameLookup[$compressionlevel] : 'invalid');
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}
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function MonkeySamplesPerFrame($versionid, $compressionlevel) {
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if ($versionid >= 3950) {
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return 73728 * 4;
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} elseif ($versionid >= 3900) {
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return 73728;
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} elseif (($versionid >= 3800) && ($compressionlevel == 4000)) {
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return 73728;
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} else {
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return 9216;
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}
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}
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?>
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