rlm@3: <?php
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | PHP version 5                                                        |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | This source file is subject to version 2 of the GPL license,         |
rlm@3: // | that is bundled with this package in the file license.txt and is     |
rlm@3: // | available through the world-wide-web at the following url:           |
rlm@3: // | http://www.gnu.org/copyleft/gpl.html                                 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Authors: James Heinrich <infoØgetid3*org>                            |
rlm@3: // |          Allan Hansen <ahØartemis*dk>                                |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | module.audio.monkey.php                                              |
rlm@3: // | Module for analyzing Monkey's Audio files                            |
rlm@3: // | dependencies: NONE                                                   |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: //
rlm@3: // $Id: module.audio.monkey.php,v 1.2 2006/11/02 10:48:01 ah Exp $
rlm@3: 
rlm@3:         
rlm@3:         
rlm@3: class getid3_monkey extends getid3_handler
rlm@3: {
rlm@3: 
rlm@3:     public function Analyze() {
rlm@3: 
rlm@3:         $getid3 = $this->getid3;
rlm@3: 
rlm@3:         // based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de>
rlm@3:         // http://jfaul.de/atl  or  http://j-faul.virtualave.net/atl/atl.html
rlm@3:         
rlm@3:         $getid3->info['fileformat']            = 'mac';
rlm@3:         $getid3->info['audio']['dataformat']   = 'mac';
rlm@3:         $getid3->info['audio']['bitrate_mode'] = 'vbr';
rlm@3:         $getid3->info['audio']['lossless']     = true;
rlm@3: 
rlm@3:         $getid3->info['monkeys_audio']['raw']  = array ();
rlm@3:         $info_monkeys_audio                    = &$getid3->info['monkeys_audio'];
rlm@3:         $info_monkeys_audio_raw                = &$info_monkeys_audio['raw'];
rlm@3: 
rlm@3:         // Read file header
rlm@3:         fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
rlm@3:         $mac_header_data = fread($getid3->fp, 74);
rlm@3: 
rlm@3:         $info_monkeys_audio_raw['magic'] = 'MAC ';  // Magic bytes
rlm@3: 
rlm@3:         // Read MAC version
rlm@3:         $info_monkeys_audio_raw['nVersion'] = getid3_lib::LittleEndian2Int(substr($mac_header_data, 4, 2)); // appears to be uint32 in 3.98+
rlm@3:         
rlm@3:         // Parse MAC Header < v3980
rlm@3:         if ($info_monkeys_audio_raw['nVersion'] < 3980) {
rlm@3:         
rlm@3:             getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 6,
rlm@3:                 array (
rlm@3:                     'nCompressionLevel'     => 2,  
rlm@3:                     'nFormatFlags'          => 2,
rlm@3:                     'nChannels'             => 2,
rlm@3:                     'nSampleRate'           => 4,
rlm@3:                     'nHeaderDataBytes'      => 4,   
rlm@3:                     'nWAVTerminatingBytes'  => 4,
rlm@3:                     'nTotalFrames'          => 4,       
rlm@3:                     'nFinalFrameSamples'    => 4, 
rlm@3:                     'nPeakLevel'            => 4,         
rlm@3:                     'IGNORE-1'              => 2, 
rlm@3:                     'nSeekElements'         => 2
rlm@3:                 )
rlm@3:             );
rlm@3:         } 
rlm@3:         
rlm@3:         // Parse MAC Header >= v3980
rlm@3:         else {
rlm@3: 
rlm@3:             getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 8, 
rlm@3:                 array (
rlm@3:                     // APE_DESCRIPTOR
rlm@3:                     'nDescriptorBytes'      => 4,
rlm@3:                     'nHeaderBytes'          => 4, 
rlm@3:                     'nSeekTableBytes'       => 4, 
rlm@3:                     'nHeaderDataBytes'      => 4, 
rlm@3:                     'nAPEFrameDataBytes'    => 4, 
rlm@3:                     'nAPEFrameDataBytesHigh'=> 4, 
rlm@3:                     'nTerminatingDataBytes' => 4, 
rlm@3:                     
rlm@3:                     // MD5 - string
rlm@3:                     'cFileMD5'              => -16, 
rlm@3:                     
rlm@3:                     // APE_HEADER
rlm@3:                     'nCompressionLevel'     => 2,
rlm@3:                     'nFormatFlags'          => 2,
rlm@3:                     'nBlocksPerFrame'       => 4,
rlm@3:                     'nFinalFrameBlocks'     => 4,
rlm@3:                     'nTotalFrames'          => 4,
rlm@3:                     'nBitsPerSample'        => 2,
rlm@3:                     'nChannels'             => 2,
rlm@3:                     'nSampleRate'           => 4
rlm@3:                 )
rlm@3:             );
rlm@3:         }
rlm@3:         
rlm@3:         // Process data
rlm@3:         $info_monkeys_audio['flags']['8-bit']         = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0001);
rlm@3:         $info_monkeys_audio['flags']['crc-32']        = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0002);
rlm@3:         $info_monkeys_audio['flags']['peak_level']    = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0004);
rlm@3:         $info_monkeys_audio['flags']['24-bit']        = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0008);
rlm@3:         $info_monkeys_audio['flags']['seek_elements'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0010);
rlm@3:         $info_monkeys_audio['flags']['no_wav_header'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0020);
rlm@3:         
rlm@3:         $info_monkeys_audio['version']                = $info_monkeys_audio_raw['nVersion'] / 1000;
rlm@3:         
rlm@3:         $info_monkeys_audio['compression']            = getid3_monkey::MonkeyCompressionLevelNameLookup($info_monkeys_audio_raw['nCompressionLevel']);
rlm@3:         
rlm@3:         $info_monkeys_audio['bits_per_sample']        = ($info_monkeys_audio['flags']['24-bit'] ? 24 : ($info_monkeys_audio['flags']['8-bit'] ? 8 : 16));
rlm@3:         
rlm@3:         $info_monkeys_audio['channels']               = $info_monkeys_audio_raw['nChannels'];
rlm@3:         
rlm@3:         $getid3->info['audio']['channels']            = $info_monkeys_audio['channels'];
rlm@3:         
rlm@3:         $info_monkeys_audio['sample_rate']            = $info_monkeys_audio_raw['nSampleRate'];
rlm@3:         
rlm@3:         $getid3->info['audio']['sample_rate']         = $info_monkeys_audio['sample_rate'];
rlm@3:         
rlm@3:         if ($info_monkeys_audio['flags']['peak_level']) {
rlm@3:             $info_monkeys_audio['peak_level']         = $info_monkeys_audio_raw['nPeakLevel'];
rlm@3:             $info_monkeys_audio['peak_ratio']         = $info_monkeys_audio['peak_level'] / pow(2, $info_monkeys_audio['bits_per_sample'] - 1);
rlm@3:         }
rlm@3:         
rlm@3:         // MAC >= v3980
rlm@3:         if ($info_monkeys_audio_raw['nVersion'] >= 3980) {
rlm@3:             $info_monkeys_audio['samples']            = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio_raw['nBlocksPerFrame']) + $info_monkeys_audio_raw['nFinalFrameBlocks'];
rlm@3:         } 
rlm@3:         
rlm@3:         // MAC < v3980
rlm@3:         else {
rlm@3:             $info_monkeys_audio['samples_per_frame']  = getid3_monkey::MonkeySamplesPerFrame($info_monkeys_audio_raw['nVersion'], $info_monkeys_audio_raw['nCompressionLevel']);
rlm@3:             $info_monkeys_audio['samples']            = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio['samples_per_frame']) + $info_monkeys_audio_raw['nFinalFrameSamples'];
rlm@3:         }
rlm@3:         
rlm@3:         $info_monkeys_audio['playtime']               = $info_monkeys_audio['samples'] / $info_monkeys_audio['sample_rate'];
rlm@3:         
rlm@3:         $getid3->info['playtime_seconds']             = $info_monkeys_audio['playtime'];
rlm@3: 
rlm@3:         $info_monkeys_audio['compressed_size']        = $getid3->info['avdataend'] - $getid3->info['avdataoffset'];
rlm@3:         $info_monkeys_audio['uncompressed_size']      = $info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * ($info_monkeys_audio['bits_per_sample'] / 8);
rlm@3:         $info_monkeys_audio['compression_ratio']      = $info_monkeys_audio['compressed_size'] / ($info_monkeys_audio['uncompressed_size'] + $info_monkeys_audio_raw['nHeaderDataBytes']);
rlm@3:         $info_monkeys_audio['bitrate']                = (($info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * $info_monkeys_audio['bits_per_sample']) / $info_monkeys_audio['playtime']) * $info_monkeys_audio['compression_ratio'];
rlm@3: 
rlm@3:         $getid3->info['audio']['bitrate']             = $info_monkeys_audio['bitrate'];
rlm@3:         
rlm@3:         $getid3->info['audio']['bits_per_sample']     = $info_monkeys_audio['bits_per_sample'];
rlm@3:         $getid3->info['audio']['encoder']             = 'MAC v'.number_format($info_monkeys_audio['version'], 2);
rlm@3:         $getid3->info['audio']['encoder_options']     = ucfirst($info_monkeys_audio['compression']).' compression';
rlm@3:         
rlm@3:         // MAC >= v3980 - get avdataoffsets from MAC header
rlm@3:         if ($info_monkeys_audio_raw['nVersion'] >= 3980) {
rlm@3:             $getid3->info['avdataoffset'] += $info_monkeys_audio_raw['nDescriptorBytes'] + $info_monkeys_audio_raw['nHeaderBytes'] + $info_monkeys_audio_raw['nSeekTableBytes'] + $info_monkeys_audio_raw['nHeaderDataBytes'];
rlm@3:             $getid3->info['avdataend']    -= $info_monkeys_audio_raw['nTerminatingDataBytes'];
rlm@3:         } 
rlm@3:         
rlm@3:         // MAC < v3980 Add size of MAC header to avdataoffset
rlm@3:         else {
rlm@3:             $getid3->info['avdataoffset'] += 8;
rlm@3:         }
rlm@3: 
rlm@3:         // Convert md5sum to 32 byte string
rlm@3:         if (@$info_monkeys_audio_raw['cFileMD5']) {
rlm@3:             if ($info_monkeys_audio_raw['cFileMD5'] !== str_repeat("\x00", 16)) {
rlm@3:                 $getid3->info['md5_data_source'] = '';
rlm@3:                 $md5 = $info_monkeys_audio_raw['cFileMD5'];
rlm@3:                 for ($i = 0; $i < strlen($md5); $i++) {
rlm@3:                     $getid3->info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
rlm@3:                 }
rlm@3:                 if (!preg_match('/^[0-9a-f]{32}$/', $getid3->info['md5_data_source'])) {
rlm@3:                     unset($getid3->info['md5_data_source']);
rlm@3:                 }
rlm@3:             }
rlm@3:         }
rlm@3:         
rlm@3: 
rlm@3:         return true;
rlm@3:     }
rlm@3: 
rlm@3:     
rlm@3:     
rlm@3:     public static function MonkeyCompressionLevelNameLookup($compression_level) {
rlm@3:         
rlm@3:         static $lookup = array (
rlm@3:             0     => 'unknown',
rlm@3:             1000  => 'fast',
rlm@3:             2000  => 'normal',
rlm@3:             3000  => 'high',
rlm@3:             4000  => 'extra-high',
rlm@3:             5000  => 'insane'
rlm@3:         );
rlm@3:         return (isset($lookup[$compression_level]) ? $lookup[$compression_level] : 'invalid');
rlm@3:     }
rlm@3: 
rlm@3:     
rlm@3:     
rlm@3:     public static function MonkeySamplesPerFrame($version_id, $compression_level) {
rlm@3: 
rlm@3:         if ($version_id >= 3950) {
rlm@3:             return 73728 * 4;
rlm@3:         } 
rlm@3:         if (($version_id >= 3900)  || (($version_id >= 3800) && ($compression_level == 4000))) {
rlm@3:             return 73728;
rlm@3:         }
rlm@3:         return 9216;
rlm@3:     }
rlm@3: 
rlm@3: }
rlm@3: 
rlm@3: ?>