mirror of
https://github.com/Yetangitu/ampache
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216 lines
No EOL
10 KiB
PHP
216 lines
No EOL
10 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2 of the GPL license, |
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// | that is bundled with this package in the file license.txt and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.gnu.org/copyleft/gpl.html |
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// +----------------------------------------------------------------------+
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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// +----------------------------------------------------------------------+
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// | Authors: James Heinrich <infoØgetid3*org> |
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// | Allan Hansen <ahØartemis*dk> |
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// +----------------------------------------------------------------------+
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// | module.audio.monkey.php |
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// | Module for analyzing Monkey's Audio files |
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// | dependencies: NONE |
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// +----------------------------------------------------------------------+
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//
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// $Id: module.audio.monkey.php,v 1.2 2006/11/02 10:48:01 ah Exp $
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class getid3_monkey extends getid3_handler
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{
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public function Analyze() {
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$getid3 = $this->getid3;
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// based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de>
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// http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html
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$getid3->info['fileformat'] = 'mac';
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$getid3->info['audio']['dataformat'] = 'mac';
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$getid3->info['audio']['bitrate_mode'] = 'vbr';
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$getid3->info['audio']['lossless'] = true;
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$getid3->info['monkeys_audio']['raw'] = array ();
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$info_monkeys_audio = &$getid3->info['monkeys_audio'];
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$info_monkeys_audio_raw = &$info_monkeys_audio['raw'];
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// Read file header
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fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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$mac_header_data = fread($getid3->fp, 74);
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$info_monkeys_audio_raw['magic'] = 'MAC '; // Magic bytes
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// Read MAC version
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$info_monkeys_audio_raw['nVersion'] = getid3_lib::LittleEndian2Int(substr($mac_header_data, 4, 2)); // appears to be uint32 in 3.98+
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// Parse MAC Header < v3980
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if ($info_monkeys_audio_raw['nVersion'] < 3980) {
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getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 6,
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array (
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'nCompressionLevel' => 2,
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'nFormatFlags' => 2,
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'nChannels' => 2,
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'nSampleRate' => 4,
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'nHeaderDataBytes' => 4,
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'nWAVTerminatingBytes' => 4,
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'nTotalFrames' => 4,
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'nFinalFrameSamples' => 4,
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'nPeakLevel' => 4,
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'IGNORE-1' => 2,
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'nSeekElements' => 2
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)
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);
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}
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// Parse MAC Header >= v3980
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else {
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getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 8,
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array (
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// APE_DESCRIPTOR
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'nDescriptorBytes' => 4,
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'nHeaderBytes' => 4,
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'nSeekTableBytes' => 4,
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'nHeaderDataBytes' => 4,
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'nAPEFrameDataBytes' => 4,
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'nAPEFrameDataBytesHigh'=> 4,
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'nTerminatingDataBytes' => 4,
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// MD5 - string
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'cFileMD5' => -16,
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// APE_HEADER
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'nCompressionLevel' => 2,
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'nFormatFlags' => 2,
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'nBlocksPerFrame' => 4,
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'nFinalFrameBlocks' => 4,
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'nTotalFrames' => 4,
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'nBitsPerSample' => 2,
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'nChannels' => 2,
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'nSampleRate' => 4
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)
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);
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}
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// Process data
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$info_monkeys_audio['flags']['8-bit'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0001);
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$info_monkeys_audio['flags']['crc-32'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0002);
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$info_monkeys_audio['flags']['peak_level'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0004);
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$info_monkeys_audio['flags']['24-bit'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0008);
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$info_monkeys_audio['flags']['seek_elements'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0010);
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$info_monkeys_audio['flags']['no_wav_header'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0020);
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$info_monkeys_audio['version'] = $info_monkeys_audio_raw['nVersion'] / 1000;
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$info_monkeys_audio['compression'] = getid3_monkey::MonkeyCompressionLevelNameLookup($info_monkeys_audio_raw['nCompressionLevel']);
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$info_monkeys_audio['bits_per_sample'] = ($info_monkeys_audio['flags']['24-bit'] ? 24 : ($info_monkeys_audio['flags']['8-bit'] ? 8 : 16));
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$info_monkeys_audio['channels'] = $info_monkeys_audio_raw['nChannels'];
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$getid3->info['audio']['channels'] = $info_monkeys_audio['channels'];
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$info_monkeys_audio['sample_rate'] = $info_monkeys_audio_raw['nSampleRate'];
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$getid3->info['audio']['sample_rate'] = $info_monkeys_audio['sample_rate'];
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if ($info_monkeys_audio['flags']['peak_level']) {
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$info_monkeys_audio['peak_level'] = $info_monkeys_audio_raw['nPeakLevel'];
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$info_monkeys_audio['peak_ratio'] = $info_monkeys_audio['peak_level'] / pow(2, $info_monkeys_audio['bits_per_sample'] - 1);
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}
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// MAC >= v3980
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if ($info_monkeys_audio_raw['nVersion'] >= 3980) {
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$info_monkeys_audio['samples'] = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio_raw['nBlocksPerFrame']) + $info_monkeys_audio_raw['nFinalFrameBlocks'];
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}
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// MAC < v3980
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else {
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$info_monkeys_audio['samples_per_frame'] = getid3_monkey::MonkeySamplesPerFrame($info_monkeys_audio_raw['nVersion'], $info_monkeys_audio_raw['nCompressionLevel']);
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$info_monkeys_audio['samples'] = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio['samples_per_frame']) + $info_monkeys_audio_raw['nFinalFrameSamples'];
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}
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$info_monkeys_audio['playtime'] = $info_monkeys_audio['samples'] / $info_monkeys_audio['sample_rate'];
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$getid3->info['playtime_seconds'] = $info_monkeys_audio['playtime'];
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$info_monkeys_audio['compressed_size'] = $getid3->info['avdataend'] - $getid3->info['avdataoffset'];
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$info_monkeys_audio['uncompressed_size'] = $info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * ($info_monkeys_audio['bits_per_sample'] / 8);
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$info_monkeys_audio['compression_ratio'] = $info_monkeys_audio['compressed_size'] / ($info_monkeys_audio['uncompressed_size'] + $info_monkeys_audio_raw['nHeaderDataBytes']);
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$info_monkeys_audio['bitrate'] = (($info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * $info_monkeys_audio['bits_per_sample']) / $info_monkeys_audio['playtime']) * $info_monkeys_audio['compression_ratio'];
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$getid3->info['audio']['bitrate'] = $info_monkeys_audio['bitrate'];
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$getid3->info['audio']['bits_per_sample'] = $info_monkeys_audio['bits_per_sample'];
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$getid3->info['audio']['encoder'] = 'MAC v'.number_format($info_monkeys_audio['version'], 2);
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$getid3->info['audio']['encoder_options'] = ucfirst($info_monkeys_audio['compression']).' compression';
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// MAC >= v3980 - get avdataoffsets from MAC header
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if ($info_monkeys_audio_raw['nVersion'] >= 3980) {
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$getid3->info['avdataoffset'] += $info_monkeys_audio_raw['nDescriptorBytes'] + $info_monkeys_audio_raw['nHeaderBytes'] + $info_monkeys_audio_raw['nSeekTableBytes'] + $info_monkeys_audio_raw['nHeaderDataBytes'];
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$getid3->info['avdataend'] -= $info_monkeys_audio_raw['nTerminatingDataBytes'];
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}
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// MAC < v3980 Add size of MAC header to avdataoffset
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else {
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$getid3->info['avdataoffset'] += 8;
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}
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// Convert md5sum to 32 byte string
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if (@$info_monkeys_audio_raw['cFileMD5']) {
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if ($info_monkeys_audio_raw['cFileMD5'] !== str_repeat("\x00", 16)) {
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$getid3->info['md5_data_source'] = '';
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$md5 = $info_monkeys_audio_raw['cFileMD5'];
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for ($i = 0; $i < strlen($md5); $i++) {
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$getid3->info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
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}
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if (!preg_match('/^[0-9a-f]{32}$/', $getid3->info['md5_data_source'])) {
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unset($getid3->info['md5_data_source']);
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}
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}
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}
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return true;
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}
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public static function MonkeyCompressionLevelNameLookup($compression_level) {
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static $lookup = array (
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0 => 'unknown',
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1000 => 'fast',
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2000 => 'normal',
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3000 => 'high',
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4000 => 'extra-high',
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5000 => 'insane'
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);
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return (isset($lookup[$compression_level]) ? $lookup[$compression_level] : 'invalid');
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}
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public static function MonkeySamplesPerFrame($version_id, $compression_level) {
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if ($version_id >= 3950) {
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return 73728 * 4;
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}
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if (($version_id >= 3900) || (($version_id >= 3800) && ($compression_level == 4000))) {
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return 73728;
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}
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return 9216;
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}
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}
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?>
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