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

   1 <?php
   2
   3 /////////////////////////////////////////////////////////////////
   4 /// getID3() by James Heinrich <info@getid3.org>               //
   5 //  available at https://github.com/JamesHeinrich/getID3       //
   6 //            or https://www.getid3.org                        //
   7 //            or http://getid3.sourceforge.net                 //
   8 //  see readme.txt for more details                            //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.audio.shorten.php                                    //
  12 // module for analyzing Shorten Audio files                    //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_shorten extends getid3_handler
  19 {
  20         /**
  21          * @return bool
  22          */
  23         public function Analyze() {
  24                 $info = &$this->getid3->info;
  25
  26                 $this->fseek($info['avdataoffset']);
  27
  28                 $ShortenHeader = $this->fread(8);
  29                 $magic = 'ajkg';
  30                 if (substr($ShortenHeader, 0, 4) != $magic) {
  31                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($ShortenHeader, 0, 4)).'"');
  32                         return false;
  33                 }
  34                 $info['fileformat']            = 'shn';
  35                 $info['audio']['dataformat']   = 'shn';
  36                 $info['audio']['lossless']     = true;
  37                 $info['audio']['bitrate_mode'] = 'vbr';
  38
  39                 $info['shn']['version'] = getid3_lib::LittleEndian2Int(substr($ShortenHeader, 4, 1));
  40
  41                 $this->fseek($info['avdataend'] - 12);
  42                 $SeekTableSignatureTest = $this->fread(12);
  43                 $info['shn']['seektable']['present'] = substr($SeekTableSignatureTest, 4, 8) == 'SHNAMPSK';
  44                 if ($info['shn']['seektable']['present']) {
  45                         $info['shn']['seektable']['length'] = getid3_lib::LittleEndian2Int(substr($SeekTableSignatureTest, 0, 4));
  46                         $info['shn']['seektable']['offset'] = $info['avdataend'] - $info['shn']['seektable']['length'];
  47                         $this->fseek($info['shn']['seektable']['offset']);
  48                         $SeekTableMagic = $this->fread(4);
  49                         $magic = 'SEEK';
  50                         if ($SeekTableMagic != $magic) {
  51
  52                                 $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['shn']['seektable']['offset'].', found "'.getid3_lib::PrintHexBytes($SeekTableMagic).'"');
  53                                 return false;
  54
  55                         } else {
  56
  57                                 // typedef struct tag_TSeekEntry
  58                                 // {
  59                                 //   unsigned long SampleNumber;
  60                                 //   unsigned long SHNFileByteOffset;
  61                                 //   unsigned long SHNLastBufferReadPosition;
  62                                 //   unsigned short SHNByteGet;
  63                                 //   unsigned short SHNBufferOffset;
  64                                 //   unsigned short SHNFileBitOffset;
  65                                 //   unsigned long SHNGBuffer;
  66                                 //   unsigned short SHNBitShift;
  67                                 //   long CBuf0[3];
  68                                 //   long CBuf1[3];
  69                                 //   long Offset0[4];
  70                                 //   long Offset1[4];
  71                                 // }TSeekEntry;
  72
  73                                 $SeekTableData = $this->fread($info['shn']['seektable']['length'] - 16);
  74                                 $info['shn']['seektable']['entry_count'] = floor(strlen($SeekTableData) / 80);
  75                                 //$info['shn']['seektable']['entries'] = array();
  76                                 //$SeekTableOffset = 0;
  77                                 //for ($i = 0; $i < $info['shn']['seektable']['entry_count']; $i++) {
  78                                 //      $SeekTableEntry['sample_number'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  79                                 //      $SeekTableOffset += 4;
  80                                 //      $SeekTableEntry['shn_file_byte_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  81                                 //      $SeekTableOffset += 4;
  82                                 //      $SeekTableEntry['shn_last_buffer_read_position'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  83                                 //      $SeekTableOffset += 4;
  84                                 //      $SeekTableEntry['shn_byte_get'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  85                                 //      $SeekTableOffset += 2;
  86                                 //      $SeekTableEntry['shn_buffer_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  87                                 //      $SeekTableOffset += 2;
  88                                 //      $SeekTableEntry['shn_file_bit_offset'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  89                                 //      $SeekTableOffset += 2;
  90                                 //      $SeekTableEntry['shn_gbuffer'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  91                                 //      $SeekTableOffset += 4;
  92                                 //      $SeekTableEntry['shn_bit_shift'] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 2));
  93                                 //      $SeekTableOffset += 2;
  94                                 //      for ($j = 0; $j < 3; $j++) {
  95                                 //              $SeekTableEntry['cbuf0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
  96                                 //              $SeekTableOffset += 4;
  97                                 //      }
  98                                 //      for ($j = 0; $j < 3; $j++) {
  99                                 //              $SeekTableEntry['cbuf1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
 100                                 //              $SeekTableOffset += 4;
 101                                 //      }
 102                                 //      for ($j = 0; $j < 4; $j++) {
 103                                 //              $SeekTableEntry['offset0'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
 104                                 //              $SeekTableOffset += 4;
 105                                 //      }
 106                                 //      for ($j = 0; $j < 4; $j++) {
 107                                 //              $SeekTableEntry['offset1'][$j] = getid3_lib::LittleEndian2Int(substr($SeekTableData, $SeekTableOffset, 4));
 108                                 //              $SeekTableOffset += 4;
 109                                 //      }
 110                                 //
 111                                 //      $info['shn']['seektable']['entries'][] = $SeekTableEntry;
 112                                 //}
 113
 114                         }
 115
 116                 }
 117
 118                 if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
 119                         $this->error('PHP running in Safe Mode - backtick operator not available, cannot run shntool to analyze Shorten files');
 120                         return false;
 121                 }
 122
 123                 if (GETID3_OS_ISWINDOWS) {
 124
 125                         $RequiredFiles = array('shorten.exe', 'cygwin1.dll', 'head.exe');
 126                         foreach ($RequiredFiles as $required_file) {
 127                                 if (!is_readable(GETID3_HELPERAPPSDIR.$required_file)) {
 128                                         $this->error(GETID3_HELPERAPPSDIR.$required_file.' does not exist');
 129                                         return false;
 130                                 }
 131                         }
 132                         $commandline = GETID3_HELPERAPPSDIR.'shorten.exe -x "'.$info['filenamepath'].'" - | '.GETID3_HELPERAPPSDIR.'head.exe -c 64';
 133                         $commandline = str_replace('/', '\\', $commandline);
 134
 135                 } else {
 136
 137                         static $shorten_present;
 138                         if (!isset($shorten_present)) {
 139                                 $shorten_present = file_exists('/usr/local/bin/shorten') || `which shorten`;
 140                         }
 141                         if (!$shorten_present) {
 142                                 $this->error('shorten binary was not found in path or /usr/local/bin');
 143                                 return false;
 144                         }
 145                         $commandline = (file_exists('/usr/local/bin/shorten') ? '/usr/local/bin/' : '' ) . 'shorten -x '.escapeshellarg($info['filenamepath']).' - | head -c 64';
 146
 147                 }
 148
 149                 $output = `$commandline`;
 150
 151                 if (!empty($output) && (substr($output, 12, 4) == 'fmt ')) {
 152
 153                         getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
 154
 155                         $fmt_size = getid3_lib::LittleEndian2Int(substr($output, 16, 4));
 156                         $DecodedWAVFORMATEX = getid3_riff::parseWAVEFORMATex(substr($output, 20, $fmt_size));
 157                         $info['audio']['channels']        = $DecodedWAVFORMATEX['channels'];
 158                         $info['audio']['bits_per_sample'] = $DecodedWAVFORMATEX['bits_per_sample'];
 159                         $info['audio']['sample_rate']     = $DecodedWAVFORMATEX['sample_rate'];
 160
 161                         if (substr($output, 20 + $fmt_size, 4) == 'data') {
 162
 163                                 $info['playtime_seconds'] = getid3_lib::LittleEndian2Int(substr($output, 20 + 4 + $fmt_size, 4)) / $DecodedWAVFORMATEX['raw']['nAvgBytesPerSec'];
 164
 165                         } else {
 166
 167                                 $this->error('shorten failed to decode DATA chunk to expected location, cannot determine playtime');
 168                                 return false;
 169
 170                         }
 171
 172                         $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) / $info['playtime_seconds']) * 8;
 173
 174                 } else {
 175
 176                         $this->error('shorten failed to decode file to WAV for parsing');
 177                         return false;
 178
 179                 }
 180
 181                 return true;
 182         }
 183
 184 }