www/plugins-dist/medias/lib/getid3/module.audio.monkey.php

   1 <?php
   2 /////////////////////////////////////////////////////////////////
   3 /// getID3() by James Heinrich <info@getid3.org>               //
   4 //  available at http://getid3.sourceforge.net                 //
   5 //            or http://www.getid3.org                         //
   6 //          also https://github.com/JamesHeinrich/getID3       //
   7 /////////////////////////////////////////////////////////////////
   8 // See readme.txt for more details                             //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.audio.monkey.php                                     //
  12 // module for analyzing Monkey's Audio files                   //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_monkey extends getid3_handler
  19 {
  20
  21         public function Analyze() {
  22                 $info = &$this->getid3->info;
  23
  24                 // based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de>
  25                 // http://jfaul.de/atl  or  http://j-faul.virtualave.net/atl/atl.html
  26
  27                 $info['fileformat']            = 'mac';
  28                 $info['audio']['dataformat']   = 'mac';
  29                 $info['audio']['bitrate_mode'] = 'vbr';
  30                 $info['audio']['lossless']     = true;
  31
  32                 $info['monkeys_audio']['raw'] = array();
  33                 $thisfile_monkeysaudio                = &$info['monkeys_audio'];
  34                 $thisfile_monkeysaudio_raw            = &$thisfile_monkeysaudio['raw'];
  35
  36                 $this->fseek($info['avdataoffset']);
  37                 $MACheaderData = $this->fread(74);
  38
  39                 $thisfile_monkeysaudio_raw['magic'] = substr($MACheaderData, 0, 4);
  40                 $magic = 'MAC ';
  41                 if ($thisfile_monkeysaudio_raw['magic'] != $magic) {
  42                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_monkeysaudio_raw['magic']).'"');
  43                         unset($info['fileformat']);
  44                         return false;
  45                 }
  46                 $thisfile_monkeysaudio_raw['nVersion']             = getid3_lib::LittleEndian2Int(substr($MACheaderData, 4, 2)); // appears to be uint32 in 3.98+
  47
  48                 if ($thisfile_monkeysaudio_raw['nVersion'] < 3980) {
  49                         $thisfile_monkeysaudio_raw['nCompressionLevel']    = getid3_lib::LittleEndian2Int(substr($MACheaderData, 6, 2));
  50                         $thisfile_monkeysaudio_raw['nFormatFlags']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, 8, 2));
  51                         $thisfile_monkeysaudio_raw['nChannels']            = getid3_lib::LittleEndian2Int(substr($MACheaderData, 10, 2));
  52                         $thisfile_monkeysaudio_raw['nSampleRate']          = getid3_lib::LittleEndian2Int(substr($MACheaderData, 12, 4));
  53                         $thisfile_monkeysaudio_raw['nHeaderDataBytes']     = getid3_lib::LittleEndian2Int(substr($MACheaderData, 16, 4));
  54                         $thisfile_monkeysaudio_raw['nWAVTerminatingBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 20, 4));
  55                         $thisfile_monkeysaudio_raw['nTotalFrames']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, 24, 4));
  56                         $thisfile_monkeysaudio_raw['nFinalFrameSamples']   = getid3_lib::LittleEndian2Int(substr($MACheaderData, 28, 4));
  57                         $thisfile_monkeysaudio_raw['nPeakLevel']           = getid3_lib::LittleEndian2Int(substr($MACheaderData, 32, 4));
  58                         $thisfile_monkeysaudio_raw['nSeekElements']        = getid3_lib::LittleEndian2Int(substr($MACheaderData, 38, 2));
  59                         $offset = 8;
  60                 } else {
  61                         $offset = 8;
  62                         // APE_DESCRIPTOR
  63                         $thisfile_monkeysaudio_raw['nDescriptorBytes']       = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  64                         $offset += 4;
  65                         $thisfile_monkeysaudio_raw['nHeaderBytes']           = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  66                         $offset += 4;
  67                         $thisfile_monkeysaudio_raw['nSeekTableBytes']        = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  68                         $offset += 4;
  69                         $thisfile_monkeysaudio_raw['nHeaderDataBytes']       = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  70                         $offset += 4;
  71                         $thisfile_monkeysaudio_raw['nAPEFrameDataBytes']     = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  72                         $offset += 4;
  73                         $thisfile_monkeysaudio_raw['nAPEFrameDataBytesHigh'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  74                         $offset += 4;
  75                         $thisfile_monkeysaudio_raw['nTerminatingDataBytes']  = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  76                         $offset += 4;
  77                         $thisfile_monkeysaudio_raw['cFileMD5']               =                              substr($MACheaderData, $offset, 16);
  78                         $offset += 16;
  79
  80                         // APE_HEADER
  81                         $thisfile_monkeysaudio_raw['nCompressionLevel']    = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  82                         $offset += 2;
  83                         $thisfile_monkeysaudio_raw['nFormatFlags']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  84                         $offset += 2;
  85                         $thisfile_monkeysaudio_raw['nBlocksPerFrame']      = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  86                         $offset += 4;
  87                         $thisfile_monkeysaudio_raw['nFinalFrameBlocks']    = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  88                         $offset += 4;
  89                         $thisfile_monkeysaudio_raw['nTotalFrames']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  90                         $offset += 4;
  91                         $thisfile_monkeysaudio_raw['nBitsPerSample']       = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  92                         $offset += 2;
  93                         $thisfile_monkeysaudio_raw['nChannels']            = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  94                         $offset += 2;
  95                         $thisfile_monkeysaudio_raw['nSampleRate']          = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  96                         $offset += 4;
  97                 }
  98
  99                 $thisfile_monkeysaudio['flags']['8-bit']         = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0001);
 100                 $thisfile_monkeysaudio['flags']['crc-32']        = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0002);
 101                 $thisfile_monkeysaudio['flags']['peak_level']    = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0004);
 102                 $thisfile_monkeysaudio['flags']['24-bit']        = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0008);
 103                 $thisfile_monkeysaudio['flags']['seek_elements'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0010);
 104                 $thisfile_monkeysaudio['flags']['no_wav_header'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0020);
 105                 $thisfile_monkeysaudio['version']                = $thisfile_monkeysaudio_raw['nVersion'] / 1000;
 106                 $thisfile_monkeysaudio['compression']            = $this->MonkeyCompressionLevelNameLookup($thisfile_monkeysaudio_raw['nCompressionLevel']);
 107                 if ($thisfile_monkeysaudio_raw['nVersion'] < 3980) {
 108                         $thisfile_monkeysaudio['samples_per_frame']      = $this->MonkeySamplesPerFrame($thisfile_monkeysaudio_raw['nVersion'], $thisfile_monkeysaudio_raw['nCompressionLevel']);
 109                 }
 110                 $thisfile_monkeysaudio['bits_per_sample']        = ($thisfile_monkeysaudio['flags']['24-bit'] ? 24 : ($thisfile_monkeysaudio['flags']['8-bit'] ? 8 : 16));
 111                 $thisfile_monkeysaudio['channels']               = $thisfile_monkeysaudio_raw['nChannels'];
 112                 $info['audio']['channels']               = $thisfile_monkeysaudio['channels'];
 113                 $thisfile_monkeysaudio['sample_rate']            = $thisfile_monkeysaudio_raw['nSampleRate'];
 114                 if ($thisfile_monkeysaudio['sample_rate'] == 0) {
 115                         $this->error('Corrupt MAC file: frequency == zero');
 116                         return false;
 117                 }
 118                 $info['audio']['sample_rate']            = $thisfile_monkeysaudio['sample_rate'];
 119                 if ($thisfile_monkeysaudio['flags']['peak_level']) {
 120                         $thisfile_monkeysaudio['peak_level']         = $thisfile_monkeysaudio_raw['nPeakLevel'];
 121                         $thisfile_monkeysaudio['peak_ratio']         = $thisfile_monkeysaudio['peak_level'] / pow(2, $thisfile_monkeysaudio['bits_per_sample'] - 1);
 122                 }
 123                 if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
 124                         $thisfile_monkeysaudio['samples']            = (($thisfile_monkeysaudio_raw['nTotalFrames'] - 1) * $thisfile_monkeysaudio_raw['nBlocksPerFrame']) + $thisfile_monkeysaudio_raw['nFinalFrameBlocks'];
 125                 } else {
 126                         $thisfile_monkeysaudio['samples']            = (($thisfile_monkeysaudio_raw['nTotalFrames'] - 1) * $thisfile_monkeysaudio['samples_per_frame']) + $thisfile_monkeysaudio_raw['nFinalFrameSamples'];
 127                 }
 128                 $thisfile_monkeysaudio['playtime']               = $thisfile_monkeysaudio['samples'] / $thisfile_monkeysaudio['sample_rate'];
 129                 if ($thisfile_monkeysaudio['playtime'] == 0) {
 130                         $this->error('Corrupt MAC file: playtime == zero');
 131                         return false;
 132                 }
 133                 $info['playtime_seconds']                = $thisfile_monkeysaudio['playtime'];
 134                 $thisfile_monkeysaudio['compressed_size']        = $info['avdataend'] - $info['avdataoffset'];
 135                 $thisfile_monkeysaudio['uncompressed_size']      = $thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * ($thisfile_monkeysaudio['bits_per_sample'] / 8);
 136                 if ($thisfile_monkeysaudio['uncompressed_size'] == 0) {
 137                         $this->error('Corrupt MAC file: uncompressed_size == zero');
 138                         return false;
 139                 }
 140                 $thisfile_monkeysaudio['compression_ratio']      = $thisfile_monkeysaudio['compressed_size'] / ($thisfile_monkeysaudio['uncompressed_size'] + $thisfile_monkeysaudio_raw['nHeaderDataBytes']);
 141                 $thisfile_monkeysaudio['bitrate']                = (($thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * $thisfile_monkeysaudio['bits_per_sample']) / $thisfile_monkeysaudio['playtime']) * $thisfile_monkeysaudio['compression_ratio'];
 142                 $info['audio']['bitrate']                = $thisfile_monkeysaudio['bitrate'];
 143
 144                 // add size of MAC header to avdataoffset
 145                 if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
 146                         $info['avdataoffset'] += $thisfile_monkeysaudio_raw['nDescriptorBytes'];
 147                         $info['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderBytes'];
 148                         $info['avdataoffset'] += $thisfile_monkeysaudio_raw['nSeekTableBytes'];
 149                         $info['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderDataBytes'];
 150
 151                         $info['avdataend'] -= $thisfile_monkeysaudio_raw['nTerminatingDataBytes'];
 152                 } else {
 153                         $info['avdataoffset'] += $offset;
 154                 }
 155
 156                 if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
 157                         if ($thisfile_monkeysaudio_raw['cFileMD5'] === str_repeat("\x00", 16)) {
 158                                 //$this->warning('cFileMD5 is null');
 159                         } else {
 160                                 $info['md5_data_source'] = '';
 161                                 $md5 = $thisfile_monkeysaudio_raw['cFileMD5'];
 162                                 for ($i = 0; $i < strlen($md5); $i++) {
 163                                         $info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
 164                                 }
 165                                 if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
 166                                         unset($info['md5_data_source']);
 167                                 }
 168                         }
 169                 }
 170
 171
 172
 173                 $info['audio']['bits_per_sample'] = $thisfile_monkeysaudio['bits_per_sample'];
 174                 $info['audio']['encoder']         = 'MAC v'.number_format($thisfile_monkeysaudio['version'], 2);
 175                 $info['audio']['encoder_options'] = ucfirst($thisfile_monkeysaudio['compression']).' compression';
 176
 177                 return true;
 178         }
 179
 180         public function MonkeyCompressionLevelNameLookup($compressionlevel) {
 181                 static $MonkeyCompressionLevelNameLookup = array(
 182                         0     => 'unknown',
 183                         1000  => 'fast',
 184                         2000  => 'normal',
 185                         3000  => 'high',
 186                         4000  => 'extra-high',
 187                         5000  => 'insane'
 188                 );
 189                 return (isset($MonkeyCompressionLevelNameLookup[$compressionlevel]) ? $MonkeyCompressionLevelNameLookup[$compressionlevel] : 'invalid');
 190         }
 191
 192         public function MonkeySamplesPerFrame($versionid, $compressionlevel) {
 193                 if ($versionid >= 3950) {
 194                         return 73728 * 4;
 195                 } elseif ($versionid >= 3900) {
 196                         return 73728;
 197                 } elseif (($versionid >= 3800) && ($compressionlevel == 4000)) {
 198                         return 73728;
 199                 } else {
 200                         return 9216;
 201                 }
 202         }
 203
 204 }