vendor/james-heinrich/getid3/getid3/module.audio.dsf.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.dsf.php                                        //
  12 // module for analyzing dsf/DSF Audio files                    //
  13 // dependencies: module.tag.id3v2.php                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.id3v2.php', __FILE__, true);
  18
  19 class getid3_dsf extends getid3_handler
  20 {
  21
  22         public function Analyze() {
  23                 $info = &$this->getid3->info;
  24
  25                 $info['fileformat']            = 'dsf';
  26                 $info['audio']['dataformat']   = 'dsf';
  27                 $info['audio']['lossless']     = true;
  28                 $info['audio']['bitrate_mode'] = 'cbr';
  29
  30                 $this->fseek($info['avdataoffset']);
  31                 $dsfheader = $this->fread(28 + 12);
  32
  33                 $headeroffset = 0;
  34                 $info['dsf']['dsd']['magic'] = substr($dsfheader, $headeroffset, 4);
  35                 $headeroffset += 4;
  36                 $magic = 'DSD ';
  37                 if ($info['dsf']['dsd']['magic'] != $magic) {
  38                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['dsf']['dsd']['magic']).'"');
  39                         unset($info['fileformat']);
  40                         unset($info['audio']);
  41                         unset($info['dsf']);
  42                         return false;
  43                 }
  44                 $info['dsf']['dsd']['dsd_chunk_size']     = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8)); // should be 28
  45                 $headeroffset += 8;
  46                 $info['dsf']['dsd']['dsf_file_size']      = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
  47                 $headeroffset += 8;
  48                 $info['dsf']['dsd']['meta_chunk_offset']  = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
  49                 $headeroffset += 8;
  50
  51
  52                 $info['dsf']['fmt']['magic'] = substr($dsfheader, $headeroffset, 4);
  53                 $headeroffset += 4;
  54                 $magic = 'fmt ';
  55                 if ($info['dsf']['fmt']['magic'] != $magic) {
  56                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['fmt']['magic']).'"');
  57                         return false;
  58                 }
  59                 $info['dsf']['fmt']['fmt_chunk_size']     = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));  // usually 52 bytes
  60                 $headeroffset += 8;
  61                 $dsfheader .= $this->fread($info['dsf']['fmt']['fmt_chunk_size'] - 12 + 12);  // we have already read the entire DSD chunk, plus 12 bytes of FMT. We now want to read the size of FMT, plus 12 bytes into the next chunk to get magic and size.
  62                 if (strlen($dsfheader) != ($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size'] + 12)) {
  63                         $this->error('Expecting '.($info['dsf']['dsd']['dsd_chunk_size'] + $info['dsf']['fmt']['fmt_chunk_size']).' bytes header, found '.strlen($dsfheader).' bytes');
  64                         return false;
  65                 }
  66                 $info['dsf']['fmt']['format_version']     = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));  // usually "1"
  67                 $headeroffset += 4;
  68                 $info['dsf']['fmt']['format_id']          = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));  // usually "0" = "DSD Raw"
  69                 $headeroffset += 4;
  70                 $info['dsf']['fmt']['channel_type_id']    = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
  71                 $headeroffset += 4;
  72                 $info['dsf']['fmt']['channels']           = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
  73                 $headeroffset += 4;
  74                 $info['dsf']['fmt']['sample_rate']        = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
  75                 $headeroffset += 4;
  76                 $info['dsf']['fmt']['bits_per_sample']    = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
  77                 $headeroffset += 4;
  78                 $info['dsf']['fmt']['sample_count']       = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
  79                 $headeroffset += 8;
  80                 $info['dsf']['fmt']['channel_block_size'] = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4));
  81                 $headeroffset += 4;
  82                 $info['dsf']['fmt']['reserved']           = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 4)); // zero-filled
  83                 $headeroffset += 4;
  84
  85
  86                 $info['dsf']['data']['magic'] = substr($dsfheader, $headeroffset, 4);
  87                 $headeroffset += 4;
  88                 $magic = 'data';
  89                 if ($info['dsf']['data']['magic'] != $magic) {
  90                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$headeroffset.', found "'.getid3_lib::PrintHexBytes($info['dsf']['data']['magic']).'"');
  91                         return false;
  92                 }
  93                 $info['dsf']['data']['data_chunk_size']    = getid3_lib::LittleEndian2Int(substr($dsfheader, $headeroffset, 8));
  94                 $headeroffset += 8;
  95                 $info['avdataoffset'] = $headeroffset;
  96                 $info['avdataend']    = $info['avdataoffset'] + $info['dsf']['data']['data_chunk_size'];
  97
  98
  99                 if ($info['dsf']['dsd']['meta_chunk_offset'] > 0) {
 100                         $getid3_id3v2 = new getid3_id3v2($this->getid3);
 101                         $getid3_id3v2->StartingOffset = $info['dsf']['dsd']['meta_chunk_offset'];
 102                         $getid3_id3v2->Analyze();
 103                         unset($getid3_id3v2);
 104                 }
 105
 106
 107                 $info['dsf']['fmt']['channel_type'] = $this->DSFchannelTypeLookup($info['dsf']['fmt']['channel_type_id']);
 108                 $info['audio']['channelmode']       = $info['dsf']['fmt']['channel_type'];
 109                 $info['audio']['bits_per_sample']   = $info['dsf']['fmt']['bits_per_sample'];
 110                 $info['audio']['sample_rate']       = $info['dsf']['fmt']['sample_rate'];
 111                 $info['audio']['channels']          = $info['dsf']['fmt']['channels'];
 112                 $info['audio']['bitrate']           = $info['audio']['bits_per_sample'] * $info['audio']['sample_rate'] * $info['audio']['channels'];
 113                 $info['playtime_seconds']           = ($info['dsf']['data']['data_chunk_size'] * 8) / $info['audio']['bitrate'];
 114
 115                 return true;
 116         }
 117
 118
 119         public static function DSFchannelTypeLookup($channel_type_id) {
 120                 static $DSFchannelTypeLookup = array(
 121                                           // interleaving order:
 122                         1 => 'mono',      // 1: Mono
 123                         2 => 'stereo',    // 1: Front-Left; 2: Front-Right
 124                         3 => '3-channel', // 1: Front-Left; 2: Front-Right; 3: Center
 125                         4 => 'quad',      // 1: Front-Left; 2: Front-Right; 3: Back-Left; 4: Back-Right
 126                         5 => '4-channel', // 1: Front-Left; 2: Front-Right; 3: Center;    4: Low-Frequency
 127                         6 => '5-channel', // 1: Front-Left; 2: Front-Right; 3: Center;    4: Back-Left      5: Back-Right
 128                         7 => '5.1',       // 1: Front-Left; 2: Front-Right; 3: Center;    4: Low-Frequency; 5: Back-Left;  6: Back-Right
 129                 );
 130                 return (isset($DSFchannelTypeLookup[$channel_type_id]) ? $DSFchannelTypeLookup[$channel_type_id] : '');
 131         }
 132
 133 }