Mercurial > judyates

     1 <?php

     2 // +----------------------------------------------------------------------+

     3 // | PHP version 5                                                        |

     4 // +----------------------------------------------------------------------+

     5 // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |

     6 // +----------------------------------------------------------------------+

     7 // | This source file is subject to version 2 of the GPL license,         |

     8 // | that is bundled with this package in the file license.txt and is     |

     9 // | available through the world-wide-web at the following url:           |

    10 // | http://www.gnu.org/copyleft/gpl.html                                 |

    11 // +----------------------------------------------------------------------+

    12 // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |

    13 // +----------------------------------------------------------------------+

    14 // | Authors: James Heinrich <infoØgetid3*org>                            |

    15 // |          Allan Hansen <ahØartemis*dk>                                |

    16 // +----------------------------------------------------------------------+

    17 // | module.audio.tta.php                                                 |

    18 // | Module for analyzing TTA Audio files                                 |

    19 // | dependencies: NONE                                                   |

    20 // +----------------------------------------------------------------------+

    21 //

    22 // $Id: module.audio.tta.php,v 1.2 2006/11/02 10:48:01 ah Exp $

    23 

    24         

    25         

    26 class getid3_tta extends getid3_handler

    27 {

    28 

    29     public function Analyze() {

    30 

    31         $getid3 = $this->getid3;

    32         

    33         $getid3->info['fileformat']            = 'tta';

    34         $getid3->info['audio']['dataformat']   = 'tta';

    35         $getid3->info['audio']['lossless']     = true;

    36         $getid3->info['audio']['bitrate_mode'] = 'vbr';

    37 

    38         fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);

    39         $tta_header = fread($getid3->fp, 26);

    40 

    41         $getid3->info['tta']['magic'] = 'TTA';  // Magic bytes

    42         

    43         switch ($tta_header{3}) {

    44         

    45             case "\x01": // TTA v1.x

    46             case "\x02": // TTA v1.x

    47             case "\x03": // TTA v1.x

    48                 

    49                 // "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."

    50                 $getid3->info['tta']['major_version'] = 1;

    51                 $getid3->info['avdataoffset'] += 16;

    52                 

    53                 getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4, 

    54                     array (

    55                         'channels'            => 2,

    56                         'bits_per_sample'     => 2,

    57                         'sample_rate'         => 4,

    58                         'samples_per_channel' => 4

    59                     )

    60                 );                

    61                 $getid3->info['tta']['compression_level'] = ord($tta_header{3});

    62                 

    63                 $getid3->info['audio']['encoder_options']   = '-e'.$getid3->info['tta']['compression_level'];

    64                 $getid3->info['playtime_seconds']           = $getid3->info['tta']['samples_per_channel'] / $getid3->info['tta']['sample_rate'];

    65                 break;

    66 

    67             case '2': // TTA v2.x

    68                 // "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."

    69                 $getid3->info['tta']['major_version'] = 2;

    70                 $getid3->info['avdataoffset'] += 20;

    71 

    72                 getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4, 

    73                     array (

    74                         'compression_level' => 2,

    75                         'audio_format'      => 2,

    76                         'channels'          => 2,

    77                         'bits_per_sample'   => 2,

    78                         'sample_rate'       => 4,

    79                         'data_length'       => 4

    80                     )

    81                 );                

    82                 

    83                 $getid3->info['audio']['encoder_options']   = '-e'.$getid3->info['tta']['compression_level'];

    84                 $getid3->info['playtime_seconds']           = $getid3->info['tta']['data_length'] / $getid3->info['tta']['sample_rate'];

    85                 break;

    86 

    87             case '1': // TTA v3.x

    88                 // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."

    89                 $getid3->info['tta']['major_version'] = 3;

    90                 $getid3->info['avdataoffset'] += 26;

    91 

    92                 getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4, 

    93                     array (

    94                         'audio_format'   => 2,

    95                         'channels'       => 2,

    96                         'bits_per_sample'=> 2,

    97                         'sample_rate'    => 4,

    98                         'data_length'    => 4,

    99                         'crc32_footer'   => -4,     // string

   100                         'seek_point'     => 4 

   101                     )

   102                 );                

   103 

   104                 $getid3->info['playtime_seconds']    = $getid3->info['tta']['data_length'] / $getid3->info['tta']['sample_rate'];

   105                 break;

   106 

   107             default:

   108                 throw new getid3_exception('This version of getID3() only knows how to handle TTA v1, v2 and v3 - it may not work correctly with this file which appears to be TTA v'.$tta_header{3});

   109                 return false;

   110                 break;

   111         }

   112 

   113         $getid3->info['audio']['encoder']         = 'TTA v'.$getid3->info['tta']['major_version'];

   114         $getid3->info['audio']['bits_per_sample'] = $getid3->info['tta']['bits_per_sample'];

   115         $getid3->info['audio']['sample_rate']     = $getid3->info['tta']['sample_rate'];

   116         $getid3->info['audio']['channels']        = $getid3->info['tta']['channels'];

   117         $getid3->info['audio']['bitrate']         = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];

   118 

   119         return true;

   120     }

   121 

   122 }

   123 

   124 

   125 ?>