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.wavpack.php                                             |

    18 // | module for analyzing WavPack v4.0+ Audio files                       |

    19 // | dependencies: audio-video.riff                                       |

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

    21 //

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

    23 

    24 

    25 class getid3_wavpack extends getid3_handler

    26 {

    27 

    28     public function Analyze() {

    29 

    30         $getid3 = $this->getid3;

    31         

    32         $getid3->include_module('audio-video.riff');

    33         

    34         $getid3->info['wavpack'] = array ();

    35         $info_wavpack = &$getid3->info['wavpack'];

    36         

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

    38 

    39         while (true) {

    40 

    41             $wavpack_header = fread($getid3->fp, 32);

    42 

    43             if (ftell($getid3->fp) >= $getid3->info['avdataend']) {

    44                 break;

    45             } elseif (feof($getid3->fp)) {

    46                 break;

    47             } elseif (

    48                 (@$info_wavpack_blockheader['total_samples'] > 0) &&

    49                 (@$info_wavpack_blockheader['block_samples'] > 0) &&

    50                 (!isset($info_wavpack['riff_trailer_size']) || ($info_wavpack['riff_trailer_size'] <= 0)) &&

    51                 ((@$info_wavpack['config_flags']['md5_checksum'] === false) || !empty($getid3->info['md5_data_source']))) {

    52                     break;

    53             }

    54 

    55             $block_header_offset = ftell($getid3->fp) - 32;

    56             $block_header_magic  =                              substr($wavpack_header, 0, 4);

    57             $block_header_size   = getid3_lib::LittleEndian2Int(substr($wavpack_header, 4, 4));

    58 

    59             if ($block_header_magic != 'wvpk') {

    60                 throw new getid3_exception('Expecting "wvpk" at offset '.$block_header_offset.', found "'.$block_header_magic.'"');

    61             }

    62 

    63             if ((@$info_wavpack_blockheader['block_samples'] <= 0)  ||  (@$info_wavpack_blockheader['total_samples'] <= 0)) {

    64                 

    65                 // Also, it is possible that the first block might not have

    66                 // any samples (block_samples == 0) and in this case you should skip blocks

    67                 // until you find one with samples because the other information (like

    68                 // total_samples) are not guaranteed to be correct until (block_samples > 0)

    69 

    70                 // Finally, I have defined a format for files in which the length is not known

    71                 // (for example when raw files are created using pipes). In these cases

    72                 // total_samples will be -1 and you must seek to the final block to determine

    73                 // the total number of samples.

    74 

    75 

    76                 $getid3->info['audio']['dataformat']   = 'wavpack';

    77                 $getid3->info['fileformat']            = 'wavpack';

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

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

    80 

    81                 $info_wavpack['blockheader']['offset'] = $block_header_offset;

    82                 $info_wavpack['blockheader']['magic']  = $block_header_magic;

    83                 $info_wavpack['blockheader']['size']   = $block_header_size;

    84                 $info_wavpack_blockheader = &$info_wavpack['blockheader'];

    85 

    86                 if ($info_wavpack_blockheader['size'] >= 0x100000) {

    87                     throw new getid3_exception('Expecting WavPack block size less than "0x100000", found "'.$info_wavpack_blockheader['size'].'" at offset '.$info_wavpack_blockheader['offset']);

    88                 }

    89 

    90                 $info_wavpack_blockheader['minor_version'] = ord($wavpack_header{8});

    91                 $info_wavpack_blockheader['major_version'] = ord($wavpack_header{9});

    92 

    93                 if (($info_wavpack_blockheader['major_version'] != 4) ||

    94                     (($info_wavpack_blockheader['minor_version'] < 4) &&

    95                     ($info_wavpack_blockheader['minor_version'] > 16))) {

    96                     throw new getid3_exception('Expecting WavPack version between "4.2" and "4.16", found version "'.$info_wavpack_blockheader['major_version'].'.'.$info_wavpack_blockheader['minor_version'].'" at offset '.$info_wavpack_blockheader['offset']);

    97                 }

    98 

    99                 $info_wavpack_blockheader['track_number']  = ord($wavpack_header{10}); // unused

   100                 $info_wavpack_blockheader['index_number']  = ord($wavpack_header{11}); // unused

   101                 

   102                 getid3_lib::ReadSequence('LittleEndian2Int', $info_wavpack_blockheader, $wavpack_header, 12,

   103                     array (

   104                         'total_samples' => 4,

   105                         'block_index'   => 4,

   106                         'block_samples' => 4,

   107                         'flags_raw'     => 4,

   108                         'crc'           => 4

   109                     )

   110                 );

   111                 

   112                 

   113                 $info_wavpack_blockheader['flags']['bytes_per_sample']     =    1 + ($info_wavpack_blockheader['flags_raw'] & 0x00000003);

   114                 $info_wavpack_blockheader['flags']['mono']                 = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000004);

   115                 $info_wavpack_blockheader['flags']['hybrid']               = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000008);

   116                 $info_wavpack_blockheader['flags']['joint_stereo']         = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000010);

   117                 $info_wavpack_blockheader['flags']['cross_decorrelation']  = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000020);

   118                 $info_wavpack_blockheader['flags']['hybrid_noiseshape']    = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000040);

   119                 $info_wavpack_blockheader['flags']['ieee_32bit_float']     = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000080);

   120                 $info_wavpack_blockheader['flags']['int_32bit']            = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000100);

   121                 $info_wavpack_blockheader['flags']['hybrid_bitrate_noise'] = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000200);

   122                 $info_wavpack_blockheader['flags']['hybrid_balance_noise'] = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000400);

   123                 $info_wavpack_blockheader['flags']['multichannel_initial'] = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00000800);

   124                 $info_wavpack_blockheader['flags']['multichannel_final']   = (bool) ($info_wavpack_blockheader['flags_raw'] & 0x00001000);

   125 

   126                 $getid3->info['audio']['lossless'] = !$info_wavpack_blockheader['flags']['hybrid'];

   127             }

   128 

   129 

   130             while (!feof($getid3->fp) && (ftell($getid3->fp) < ($block_header_offset + $block_header_size + 8))) {

   131 

   132                 $metablock = array('offset'=>ftell($getid3->fp));

   133                 $metablockheader = fread($getid3->fp, 2);

   134                 if (feof($getid3->fp)) {

   135                     break;

   136                 }

   137                 $metablock['id'] = ord($metablockheader{0});

   138                 $metablock['function_id'] = ($metablock['id'] & 0x3F);

   139                 $metablock['function_name'] = $this->WavPackMetablockNameLookup($metablock['function_id']);

   140 

   141                 // The 0x20 bit in the id of the meta subblocks (which is defined as

   142                 // ID_OPTIONAL_DATA) is a permanent part of the id. The idea is that

   143                 // if a decoder encounters an id that it does not know about, it uses

   144                 // that "ID_OPTIONAL_DATA" flag to determine what to do. If it is set

   145                 // then the decoder simply ignores the metadata, but if it is zero

   146                 // then the decoder should quit because it means that an understanding

   147                 // of the metadata is required to correctly decode the audio.

   148                 

   149                 $metablock['non_decoder'] = (bool) ($metablock['id'] & 0x20);

   150                 $metablock['padded_data'] = (bool) ($metablock['id'] & 0x40);

   151                 $metablock['large_block'] = (bool) ($metablock['id'] & 0x80);

   152                 if ($metablock['large_block']) {

   153                     $metablockheader .= fread($getid3->fp, 2);

   154                 }

   155                 $metablock['size'] = getid3_lib::LittleEndian2Int(substr($metablockheader, 1)) * 2; // size is stored in words

   156                 $metablock['data'] = null;

   157 

   158                 if ($metablock['size'] > 0) {

   159 

   160                     switch ($metablock['function_id']) {

   161 

   162                         case 0x21: // ID_RIFF_HEADER

   163                         case 0x22: // ID_RIFF_TRAILER

   164                         case 0x23: // ID_REPLAY_GAIN

   165                         case 0x24: // ID_CUESHEET

   166                         case 0x25: // ID_CONFIG_BLOCK

   167                         case 0x26: // ID_MD5_CHECKSUM

   168                             $metablock['data'] = fread($getid3->fp, $metablock['size']);

   169 

   170                             if ($metablock['padded_data']) {

   171                                 // padded to the nearest even byte

   172                                 $metablock['size']--;

   173                                 $metablock['data'] = substr($metablock['data'], 0, -1);

   174                             }

   175                             break;

   176 

   177 

   178                         case 0x00: // ID_DUMMY

   179                         case 0x01: // ID_ENCODER_INFO

   180                         case 0x02: // ID_DECORR_TERMS

   181                         case 0x03: // ID_DECORR_WEIGHTS

   182                         case 0x04: // ID_DECORR_SAMPLES

   183                         case 0x05: // ID_ENTROPY_VARS

   184                         case 0x06: // ID_HYBRID_PROFILE

   185                         case 0x07: // ID_SHAPING_WEIGHTS

   186                         case 0x08: // ID_FLOAT_INFO

   187                         case 0x09: // ID_INT32_INFO

   188                         case 0x0A: // ID_WV_BITSTREAM

   189                         case 0x0B: // ID_WVC_BITSTREAM

   190                         case 0x0C: // ID_WVX_BITSTREAM

   191                         case 0x0D: // ID_CHANNEL_INFO

   192                             fseek($getid3->fp, $metablock['offset'] + ($metablock['large_block'] ? 4 : 2) + $metablock['size'], SEEK_SET);

   193                             break;

   194 

   195 

   196                         default:

   197                             $getid3->warning('Unexpected metablock type "0x'.str_pad(dechex($metablock['function_id']), 2, '0', STR_PAD_LEFT).'" at offset '.$metablock['offset']);

   198                             fseek($getid3->fp, $metablock['offset'] + ($metablock['large_block'] ? 4 : 2) + $metablock['size'], SEEK_SET);

   199                             break;

   200                     }

   201 

   202 

   203                     switch ($metablock['function_id']) {

   204 

   205                         case 0x21: // ID_RIFF_HEADER

   206                             

   207                             $original_wav_filesize = getid3_lib::LittleEndian2Int(substr($metablock['data'], 4, 4));

   208                             

   209                             // Clone getid3 

   210                             $clone = clone $getid3;

   211                             

   212                             // Analyze clone by string

   213                             $riff = new getid3_riff($clone);

   214                             $riff->AnalyzeString($metablock['data']);

   215                             

   216                             // Import from clone and destroy

   217                             $metablock['riff'] = $clone->info['riff'];

   218                             $getid3->warnings($clone->warnings());

   219                             unset($clone);

   220                             

   221                             // Save RIFF header - we may need it later for RIFF footer parsing

   222                             $this->riff_header = $metablock['data'];

   223                             

   224                             $metablock['riff']['original_filesize'] = $original_wav_filesize;

   225                             $info_wavpack['riff_trailer_size'] = $original_wav_filesize - $metablock['riff']['WAVE']['data'][0]['size'] - $metablock['riff']['header_size'];

   226 

   227                             $getid3->info['audio']['sample_rate'] = $metablock['riff']['raw']['fmt ']['nSamplesPerSec'];

   228                             $getid3->info['playtime_seconds']     = $info_wavpack_blockheader['total_samples'] / $getid3->info['audio']['sample_rate'];

   229 

   230                             // Safe RIFF header in case there's a RIFF footer later

   231                             $metablock_riff_header = $metablock['data'];

   232                             break;

   233 

   234 

   235                         case 0x22: // ID_RIFF_TRAILER

   236 

   237                             $metablock_riff_footer = $metablock_riff_header.$metablock['data'];

   238                             

   239                             $start_offset = $metablock['offset'] + ($metablock['large_block'] ? 4 : 2);

   240                             

   241                             $ftell_old = ftell($getid3->fp);

   242                             

   243                             // Clone getid3 

   244                             $clone = clone $getid3;

   245                             

   246                             // Call public method that really should be private

   247                             $riff = new getid3_riff($clone);

   248                             $metablock['riff'] = $riff->ParseRIFF($start_offset, $start_offset + $metablock['size']);

   249                             unset($clone);

   250                             

   251                             fseek($getid3->fp, $ftell_old, SEEK_SET);

   252 

   253                             if (!empty($metablock['riff']['INFO'])) {

   254                                 getid3_riff::RIFFCommentsParse($metablock['riff']['INFO'], $metablock['comments']);

   255                                 $getid3->info['tags']['riff'] = $metablock['comments'];

   256                             }

   257                             break;

   258 

   259 

   260                         case 0x23: // ID_REPLAY_GAIN

   261                             $getid3->warning('WavPack "Replay Gain" contents not yet handled by getID3() in metablock at offset '.$metablock['offset']);

   262                             break;

   263 

   264 

   265                         case 0x24: // ID_CUESHEET

   266                             $getid3->warning('WavPack "Cuesheet" contents not yet handled by getID3() in metablock at offset '.$metablock['offset']);

   267                             break;

   268 

   269 

   270                         case 0x25: // ID_CONFIG_BLOCK

   271                             $metablock['flags_raw'] = getid3_lib::LittleEndian2Int(substr($metablock['data'], 0, 3));

   272 

   273                             $metablock['flags']['adobe_mode']     = (bool) ($metablock['flags_raw'] & 0x000001); // "adobe" mode for 32-bit floats

   274                             $metablock['flags']['fast_flag']      = (bool) ($metablock['flags_raw'] & 0x000002); // fast mode

   275                             $metablock['flags']['very_fast_flag'] = (bool) ($metablock['flags_raw'] & 0x000004); // double fast

   276                             $metablock['flags']['high_flag']      = (bool) ($metablock['flags_raw'] & 0x000008); // high quality mode

   277                             $metablock['flags']['very_high_flag'] = (bool) ($metablock['flags_raw'] & 0x000010); // double high (not used yet)

   278                             $metablock['flags']['bitrate_kbps']   = (bool) ($metablock['flags_raw'] & 0x000020); // bitrate is kbps, not bits / sample

   279                             $metablock['flags']['auto_shaping']   = (bool) ($metablock['flags_raw'] & 0x000040); // automatic noise shaping

   280                             $metablock['flags']['shape_override'] = (bool) ($metablock['flags_raw'] & 0x000080); // shaping mode specified

   281                             $metablock['flags']['joint_override'] = (bool) ($metablock['flags_raw'] & 0x000100); // joint-stereo mode specified

   282                             $metablock['flags']['copy_time']      = (bool) ($metablock['flags_raw'] & 0x000200); // copy file-time from source

   283                             $metablock['flags']['create_exe']     = (bool) ($metablock['flags_raw'] & 0x000400); // create executable

   284                             $metablock['flags']['create_wvc']     = (bool) ($metablock['flags_raw'] & 0x000800); // create correction file

   285                             $metablock['flags']['optimize_wvc']   = (bool) ($metablock['flags_raw'] & 0x001000); // maximize bybrid compression

   286                             $metablock['flags']['quality_mode']   = (bool) ($metablock['flags_raw'] & 0x002000); // psychoacoustic quality mode

   287                             $metablock['flags']['raw_flag']       = (bool) ($metablock['flags_raw'] & 0x004000); // raw mode (not implemented yet)

   288                             $metablock['flags']['calc_noise']     = (bool) ($metablock['flags_raw'] & 0x008000); // calc noise in hybrid mode

   289                             $metablock['flags']['lossy_mode']     = (bool) ($metablock['flags_raw'] & 0x010000); // obsolete (for information)

   290                             $metablock['flags']['extra_mode']     = (bool) ($metablock['flags_raw'] & 0x020000); // extra processing mode

   291                             $metablock['flags']['skip_wvx']       = (bool) ($metablock['flags_raw'] & 0x040000); // no wvx stream w/ floats & big ints

   292                             $metablock['flags']['md5_checksum']   = (bool) ($metablock['flags_raw'] & 0x080000); // compute & store MD5 signature

   293                             $metablock['flags']['quiet_mode']     = (bool) ($metablock['flags_raw'] & 0x100000); // don't report progress %

   294 

   295                             $info_wavpack['config_flags'] = $metablock['flags'];

   296 

   297                             $getid3->info['audio']['encoder_options'] = trim(

   298                                 ($info_wavpack_blockheader['flags']['hybrid'] ? ' -b???' : '') .

   299                                 ($metablock['flags']['adobe_mode']            ? ' -a'    : '') .

   300                                 ($metablock['flags']['optimize_wvc']          ? ' -cc'   : '') .

   301                                 ($metablock['flags']['create_exe']            ? ' -e'    : '') .

   302                                 ($metablock['flags']['fast_flag']             ? ' -f'    : '') .

   303                                 ($metablock['flags']['joint_override']        ? ' -j?'   : '') .

   304                                 ($metablock['flags']['high_flag']             ? ' -h'    : '') .

   305                                 ($metablock['flags']['md5_checksum']          ? ' -m'    : '') .

   306                                 ($metablock['flags']['calc_noise']            ? ' -n'    : '') .

   307                                 ($metablock['flags']['shape_override']        ? ' -s?'   : '') .

   308                                 ($metablock['flags']['extra_mode']            ? ' -x?'   : '')

   309                             );

   310                             if (!$getid3->info['audio']['encoder_options']) {

   311                                 unset($getid3->info['audio']['encoder_options']);

   312                             }

   313                             break;

   314 

   315 

   316                         case 0x26: // ID_MD5_CHECKSUM

   317                             if (strlen($metablock['data']) == 16) {

   318                                 $getid3->info['md5_data_source'] = strtolower(getid3_lib::PrintHexBytes($metablock['data'], true, false, false));

   319                             } else {

   320                                 $getid3->warning('Expecting 16 bytes of WavPack "MD5 Checksum" in metablock at offset '.$metablock['offset'].', but found '.strlen($metablock['data']).' bytes');

   321                             }

   322                             break;

   323 

   324 

   325                         case 0x00: // ID_DUMMY

   326                         case 0x01: // ID_ENCODER_INFO

   327                         case 0x02: // ID_DECORR_TERMS

   328                         case 0x03: // ID_DECORR_WEIGHTS

   329                         case 0x04: // ID_DECORR_SAMPLES

   330                         case 0x05: // ID_ENTROPY_VARS

   331                         case 0x06: // ID_HYBRID_PROFILE

   332                         case 0x07: // ID_SHAPING_WEIGHTS

   333                         case 0x08: // ID_FLOAT_INFO

   334                         case 0x09: // ID_INT32_INFO

   335                         case 0x0A: // ID_WV_BITSTREAM

   336                         case 0x0B: // ID_WVC_BITSTREAM

   337                         case 0x0C: // ID_WVX_BITSTREAM

   338                         case 0x0D: // ID_CHANNEL_INFO

   339                             unset($metablock);

   340                             break;

   341                     }

   342 

   343                 }

   344             

   345                 if (!empty($metablock)) {

   346                     $info_wavpack['metablocks'][] = $metablock;

   347                 }

   348 

   349             }

   350 

   351         }

   352 

   353         $getid3->info['audio']['encoder']         = 'WavPack v'.$info_wavpack_blockheader['major_version'].'.'.str_pad($info_wavpack_blockheader['minor_version'], 2, '0', STR_PAD_LEFT);

   354         $getid3->info['audio']['bits_per_sample'] = $info_wavpack_blockheader['flags']['bytes_per_sample'] * 8;

   355         $getid3->info['audio']['channels']        = ($info_wavpack_blockheader['flags']['mono'] ? 1 : 2);

   356 

   357         if (@$getid3->info['playtime_seconds']) {

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

   359         } else {

   360             $getid3->info['audio']['dataformat']  = 'wvc';

   361         }

   362 

   363         return true;

   364     }

   365 

   366 

   367 

   368     public static function WavPackMetablockNameLookup($id) {

   369 

   370         static $lookup = array(

   371             0x00 => 'Dummy',

   372             0x01 => 'Encoder Info',

   373             0x02 => 'Decorrelation Terms',

   374             0x03 => 'Decorrelation Weights',

   375             0x04 => 'Decorrelation Samples',

   376             0x05 => 'Entropy Variables',

   377             0x06 => 'Hybrid Profile',

   378             0x07 => 'Shaping Weights',

   379             0x08 => 'Float Info',

   380             0x09 => 'Int32 Info',

   381             0x0A => 'WV Bitstream',

   382             0x0B => 'WVC Bitstream',

   383             0x0C => 'WVX Bitstream',

   384             0x0D => 'Channel Info',

   385             0x21 => 'RIFF header',

   386             0x22 => 'RIFF trailer',

   387             0x23 => 'Replay Gain',

   388             0x24 => 'Cuesheet',

   389             0x25 => 'Config Block',

   390             0x26 => 'MD5 Checksum',

   391         );

   392         

   393         return (@$lookup[$id]);

   394     }

   395 

   396 }

   397 

   398 

   399 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Mon, 11 Jul 2011 03:06:13 -0400
parents	3f6b44aa6b35
children