wp-includes/ID3/module.audio.flac.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.flac.php                                       //
  12 // module for analyzing FLAC and OggFLAC audio files           //
  13 // dependencies: module.audio.ogg.php                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
  19
  20 /**
  21 * @tutorial http://flac.sourceforge.net/format.html
  22 */
  23 class getid3_flac extends getid3_handler
  24 {
  25         const syncword = 'fLaC';
  26
  27         public function Analyze() {
  28                 $info = &$this->getid3->info;
  29
  30                 $this->fseek($info['avdataoffset']);
  31                 $StreamMarker = $this->fread(4);
  32                 if ($StreamMarker != self::syncword) {
  33                         return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($StreamMarker).'"');
  34                 }
  35                 $info['fileformat']            = 'flac';
  36                 $info['audio']['dataformat']   = 'flac';
  37                 $info['audio']['bitrate_mode'] = 'vbr';
  38                 $info['audio']['lossless']     = true;
  39
  40                 // parse flac container
  41                 return $this->parseMETAdata();
  42         }
  43
  44         public function parseMETAdata() {
  45                 $info = &$this->getid3->info;
  46                 do {
  47                         $BlockOffset   = $this->ftell();
  48                         $BlockHeader   = $this->fread(4);
  49                         $LBFBT         = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));
  50                         $LastBlockFlag = (bool) ($LBFBT & 0x80);
  51                         $BlockType     =        ($LBFBT & 0x7F);
  52                         $BlockLength   = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));
  53                         $BlockTypeText = self::metaBlockTypeLookup($BlockType);
  54
  55                         if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) {
  56                                 $this->error('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file');
  57                                 break;
  58                         }
  59                         if ($BlockLength < 1) {
  60                                 $this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid');
  61                                 break;
  62                         }
  63
  64                         $info['flac'][$BlockTypeText]['raw'] = array();
  65                         $BlockTypeText_raw = &$info['flac'][$BlockTypeText]['raw'];
  66
  67                         $BlockTypeText_raw['offset']          = $BlockOffset;
  68                         $BlockTypeText_raw['last_meta_block'] = $LastBlockFlag;
  69                         $BlockTypeText_raw['block_type']      = $BlockType;
  70                         $BlockTypeText_raw['block_type_text'] = $BlockTypeText;
  71                         $BlockTypeText_raw['block_length']    = $BlockLength;
  72                         if ($BlockTypeText_raw['block_type'] != 0x06) { // do not read attachment data automatically
  73                                 $BlockTypeText_raw['block_data']  = $this->fread($BlockLength);
  74                         }
  75
  76                         switch ($BlockTypeText) {
  77                                 case 'STREAMINFO':     // 0x00
  78                                         if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) {
  79                                                 return false;
  80                                         }
  81                                         break;
  82
  83                                 case 'PADDING':        // 0x01
  84                                         unset($info['flac']['PADDING']); // ignore
  85                                         break;
  86
  87                                 case 'APPLICATION':    // 0x02
  88                                         if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) {
  89                                                 return false;
  90                                         }
  91                                         break;
  92
  93                                 case 'SEEKTABLE':      // 0x03
  94                                         if (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) {
  95                                                 return false;
  96                                         }
  97                                         break;
  98
  99                                 case 'VORBIS_COMMENT': // 0x04
 100                                         if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) {
 101                                                 return false;
 102                                         }
 103                                         break;
 104
 105                                 case 'CUESHEET':       // 0x05
 106                                         if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) {
 107                                                 return false;
 108                                         }
 109                                         break;
 110
 111                                 case 'PICTURE':        // 0x06
 112                                         if (!$this->parsePICTURE()) {
 113                                                 return false;
 114                                         }
 115                                         break;
 116
 117                                 default:
 118                                         $this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockType.') at offset '.$BlockOffset);
 119                         }
 120
 121                         unset($info['flac'][$BlockTypeText]['raw']);
 122                         $info['avdataoffset'] = $this->ftell();
 123                 }
 124                 while ($LastBlockFlag === false);
 125
 126                 // handle tags
 127                 if (!empty($info['flac']['VORBIS_COMMENT']['comments'])) {
 128                         $info['flac']['comments'] = $info['flac']['VORBIS_COMMENT']['comments'];
 129                 }
 130                 if (!empty($info['flac']['VORBIS_COMMENT']['vendor'])) {
 131                         $info['audio']['encoder'] = str_replace('reference ', '', $info['flac']['VORBIS_COMMENT']['vendor']);
 132                 }
 133
 134                 // copy attachments to 'comments' array if nesesary
 135                 if (isset($info['flac']['PICTURE']) && ($this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE)) {
 136                         foreach ($info['flac']['PICTURE'] as $entry) {
 137                                 if (!empty($entry['data'])) {
 138                                         if (!isset($info['flac']['comments']['picture'])) {
 139                                                 $info['flac']['comments']['picture'] = array();
 140                                         }
 141                                         $comments_picture_data = array();
 142                                         foreach (array('data', 'image_mime', 'image_width', 'image_height', 'imagetype', 'picturetype', 'description', 'datalength') as $picture_key) {
 143                                                 if (isset($entry[$picture_key])) {
 144                                                         $comments_picture_data[$picture_key] = $entry[$picture_key];
 145                                                 }
 146                                         }
 147                                         $info['flac']['comments']['picture'][] = $comments_picture_data;
 148                                         unset($comments_picture_data);
 149                                 }
 150                         }
 151                 }
 152
 153                 if (isset($info['flac']['STREAMINFO'])) {
 154                         if (!$this->isDependencyFor('matroska')) {
 155                                 $info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset'];
 156                         }
 157                         $info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8);
 158                         if ($info['flac']['uncompressed_audio_bytes'] == 0) {
 159                                 return $this->error('Corrupt FLAC file: uncompressed_audio_bytes == zero');
 160                         }
 161                         if (!empty($info['flac']['compressed_audio_bytes'])) {
 162                                 $info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes'];
 163                         }
 164                 }
 165
 166                 // set md5_data_source - built into flac 0.5+
 167                 if (isset($info['flac']['STREAMINFO']['audio_signature'])) {
 168
 169                         if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) {
 170                 $this->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)');
 171                         }
 172                         else {
 173                                 $info['md5_data_source'] = '';
 174                                 $md5 = $info['flac']['STREAMINFO']['audio_signature'];
 175                                 for ($i = 0; $i < strlen($md5); $i++) {
 176                                         $info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
 177                                 }
 178                                 if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
 179                                         unset($info['md5_data_source']);
 180                                 }
 181                         }
 182                 }
 183
 184                 if (isset($info['flac']['STREAMINFO']['bits_per_sample'])) {
 185                         $info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
 186                         if ($info['audio']['bits_per_sample'] == 8) {
 187                                 // special case
 188                                 // must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
 189                                 // MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
 190                                 $this->warning('FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file');
 191                         }
 192                 }
 193
 194                 return true;
 195         }
 196
 197         private function parseSTREAMINFO($BlockData) {
 198                 $info = &$this->getid3->info;
 199
 200                 $info['flac']['STREAMINFO'] = array();
 201                 $streaminfo = &$info['flac']['STREAMINFO'];
 202
 203                 $streaminfo['min_block_size']  = getid3_lib::BigEndian2Int(substr($BlockData, 0, 2));
 204                 $streaminfo['max_block_size']  = getid3_lib::BigEndian2Int(substr($BlockData, 2, 2));
 205                 $streaminfo['min_frame_size']  = getid3_lib::BigEndian2Int(substr($BlockData, 4, 3));
 206                 $streaminfo['max_frame_size']  = getid3_lib::BigEndian2Int(substr($BlockData, 7, 3));
 207
 208                 $SRCSBSS                       = getid3_lib::BigEndian2Bin(substr($BlockData, 10, 8));
 209                 $streaminfo['sample_rate']     = getid3_lib::Bin2Dec(substr($SRCSBSS,  0, 20));
 210                 $streaminfo['channels']        = getid3_lib::Bin2Dec(substr($SRCSBSS, 20,  3)) + 1;
 211                 $streaminfo['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 23,  5)) + 1;
 212                 $streaminfo['samples_stream']  = getid3_lib::Bin2Dec(substr($SRCSBSS, 28, 36));
 213
 214                 $streaminfo['audio_signature'] = substr($BlockData, 18, 16);
 215
 216                 if (!empty($streaminfo['sample_rate'])) {
 217
 218                         $info['audio']['bitrate_mode']    = 'vbr';
 219                         $info['audio']['sample_rate']     = $streaminfo['sample_rate'];
 220                         $info['audio']['channels']        = $streaminfo['channels'];
 221                         $info['audio']['bits_per_sample'] = $streaminfo['bits_per_sample'];
 222                         $info['playtime_seconds']         = $streaminfo['samples_stream'] / $streaminfo['sample_rate'];
 223                         if ($info['playtime_seconds'] > 0) {
 224                                 if (!$this->isDependencyFor('matroska')) {
 225                                         $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 226                                 }
 227                                 else {
 228                                         $this->warning('Cannot determine audio bitrate because total stream size is unknown');
 229                                 }
 230                         }
 231
 232                 } else {
 233                         return $this->error('Corrupt METAdata block: STREAMINFO');
 234                 }
 235
 236                 return true;
 237         }
 238
 239         private function parseAPPLICATION($BlockData) {
 240                 $info = &$this->getid3->info;
 241
 242                 $ApplicationID = getid3_lib::BigEndian2Int(substr($BlockData, 0, 4));
 243                 $info['flac']['APPLICATION'][$ApplicationID]['name'] = self::applicationIDLookup($ApplicationID);
 244                 $info['flac']['APPLICATION'][$ApplicationID]['data'] = substr($BlockData, 4);
 245
 246                 return true;
 247         }
 248
 249         private function parseSEEKTABLE($BlockData) {
 250                 $info = &$this->getid3->info;
 251
 252                 $offset = 0;
 253                 $BlockLength = strlen($BlockData);
 254                 $placeholderpattern = str_repeat("\xFF", 8);
 255                 while ($offset < $BlockLength) {
 256                         $SampleNumberString = substr($BlockData, $offset, 8);
 257                         $offset += 8;
 258                         if ($SampleNumberString == $placeholderpattern) {
 259
 260                                 // placeholder point
 261                                 getid3_lib::safe_inc($info['flac']['SEEKTABLE']['placeholders'], 1);
 262                                 $offset += 10;
 263
 264                         } else {
 265
 266                                 $SampleNumber                                        = getid3_lib::BigEndian2Int($SampleNumberString);
 267                                 $info['flac']['SEEKTABLE'][$SampleNumber]['offset']  = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
 268                                 $offset += 8;
 269                                 $info['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 2));
 270                                 $offset += 2;
 271
 272                         }
 273                 }
 274
 275                 return true;
 276         }
 277
 278         private function parseVORBIS_COMMENT($BlockData) {
 279                 $info = &$this->getid3->info;
 280
 281                 $getid3_ogg = new getid3_ogg($this->getid3);
 282                 if ($this->isDependencyFor('matroska')) {
 283                         $getid3_ogg->setStringMode($this->data_string);
 284                 }
 285                 $getid3_ogg->ParseVorbisComments();
 286                 if (isset($info['ogg'])) {
 287                         unset($info['ogg']['comments_raw']);
 288                         $info['flac']['VORBIS_COMMENT'] = $info['ogg'];
 289                         unset($info['ogg']);
 290                 }
 291
 292                 unset($getid3_ogg);
 293
 294                 return true;
 295         }
 296
 297         private function parseCUESHEET($BlockData) {
 298                 $info = &$this->getid3->info;
 299                 $offset = 0;
 300                 $info['flac']['CUESHEET']['media_catalog_number'] =                              trim(substr($BlockData, $offset, 128), "\0");
 301                 $offset += 128;
 302                 $info['flac']['CUESHEET']['lead_in_samples']      =         getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
 303                 $offset += 8;
 304                 $info['flac']['CUESHEET']['flags']['is_cd']       = (bool) (getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)) & 0x80);
 305                 $offset += 1;
 306
 307                 $offset += 258; // reserved
 308
 309                 $info['flac']['CUESHEET']['number_tracks']        =         getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
 310                 $offset += 1;
 311
 312                 for ($track = 0; $track < $info['flac']['CUESHEET']['number_tracks']; $track++) {
 313                         $TrackSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
 314                         $offset += 8;
 315                         $TrackNumber       = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
 316                         $offset += 1;
 317
 318                         $info['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset']         = $TrackSampleOffset;
 319
 320                         $info['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc']                  =                           substr($BlockData, $offset, 12);
 321                         $offset += 12;
 322
 323                         $TrackFlagsRaw                                                             = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
 324                         $offset += 1;
 325                         $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio']     = (bool) ($TrackFlagsRaw & 0x80);
 326                         $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
 327
 328                         $offset += 13; // reserved
 329
 330                         $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']          = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
 331                         $offset += 1;
 332
 333                         for ($index = 0; $index < $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
 334                                 $IndexSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
 335                                 $offset += 8;
 336                                 $IndexNumber       = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
 337                                 $offset += 1;
 338
 339                                 $offset += 3; // reserved
 340
 341                                 $info['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
 342                         }
 343                 }
 344
 345                 return true;
 346         }
 347
 348         /**
 349         * Parse METADATA_BLOCK_PICTURE flac structure and extract attachment
 350         * External usage: audio.ogg
 351         */
 352         public function parsePICTURE() {
 353                 $info = &$this->getid3->info;
 354
 355                 $picture['typeid']         = getid3_lib::BigEndian2Int($this->fread(4));
 356                 $picture['picturetype']    = self::pictureTypeLookup($picture['typeid']);
 357                 $picture['image_mime']     = $this->fread(getid3_lib::BigEndian2Int($this->fread(4)));
 358                 $descr_length              = getid3_lib::BigEndian2Int($this->fread(4));
 359                 if ($descr_length) {
 360                         $picture['description'] = $this->fread($descr_length);
 361                 }
 362                 $picture['image_width']    = getid3_lib::BigEndian2Int($this->fread(4));
 363                 $picture['image_height']   = getid3_lib::BigEndian2Int($this->fread(4));
 364                 $picture['color_depth']    = getid3_lib::BigEndian2Int($this->fread(4));
 365                 $picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4));
 366                 $picture['datalength']     = getid3_lib::BigEndian2Int($this->fread(4));
 367
 368                 if ($picture['image_mime'] == '-->') {
 369                         $picture['data'] = $this->fread($picture['datalength']);
 370                 } else {
 371                         $picture['data'] = $this->saveAttachment(
 372                                 str_replace('/', '_', $picture['picturetype']).'_'.$this->ftell(),
 373                                 $this->ftell(),
 374                                 $picture['datalength'],
 375                                 $picture['image_mime']);
 376                 }
 377
 378                 $info['flac']['PICTURE'][] = $picture;
 379
 380                 return true;
 381         }
 382
 383         public static function metaBlockTypeLookup($blocktype) {
 384                 static $lookup = array(
 385                         0 => 'STREAMINFO',
 386                         1 => 'PADDING',
 387                         2 => 'APPLICATION',
 388                         3 => 'SEEKTABLE',
 389                         4 => 'VORBIS_COMMENT',
 390                         5 => 'CUESHEET',
 391                         6 => 'PICTURE',
 392                 );
 393                 return (isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved');
 394         }
 395
 396         public static function applicationIDLookup($applicationid) {
 397                 // http://flac.sourceforge.net/id.html
 398                 static $lookup = array(
 399                         0x41544348 => 'FlacFile',                                                                           // "ATCH"
 400                         0x42534F4C => 'beSolo',                                                                             // "BSOL"
 401                         0x42554753 => 'Bugs Player',                                                                        // "BUGS"
 402                         0x43756573 => 'GoldWave cue points (specification)',                                                // "Cues"
 403                         0x46696361 => 'CUE Splitter',                                                                       // "Fica"
 404                         0x46746F6C => 'flac-tools',                                                                         // "Ftol"
 405                         0x4D4F5442 => 'MOTB MetaCzar',                                                                      // "MOTB"
 406                         0x4D505345 => 'MP3 Stream Editor',                                                                  // "MPSE"
 407                         0x4D754D4C => 'MusicML: Music Metadata Language',                                                   // "MuML"
 408                         0x52494646 => 'Sound Devices RIFF chunk storage',                                                   // "RIFF"
 409                         0x5346464C => 'Sound Font FLAC',                                                                    // "SFFL"
 410                         0x534F4E59 => 'Sony Creative Software',                                                             // "SONY"
 411                         0x5351455A => 'flacsqueeze',                                                                        // "SQEZ"
 412                         0x54745776 => 'TwistedWave',                                                                        // "TtWv"
 413                         0x55495453 => 'UITS Embedding tools',                                                               // "UITS"
 414                         0x61696666 => 'FLAC AIFF chunk storage',                                                            // "aiff"
 415                         0x696D6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks',  // "imag"
 416                         0x7065656D => 'Parseable Embedded Extensible Metadata (specification)',                             // "peem"
 417                         0x71667374 => 'QFLAC Studio',                                                                       // "qfst"
 418                         0x72696666 => 'FLAC RIFF chunk storage',                                                            // "riff"
 419                         0x74756E65 => 'TagTuner',                                                                           // "tune"
 420                         0x78626174 => 'XBAT',                                                                               // "xbat"
 421                         0x786D6364 => 'xmcd',                                                                               // "xmcd"
 422                 );
 423                 return (isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved');
 424         }
 425
 426         public static function pictureTypeLookup($type_id) {
 427                 static $lookup = array (
 428                          0 => 'Other',
 429                          1 => '32x32 pixels \'file icon\' (PNG only)',
 430                          2 => 'Other file icon',
 431                          3 => 'Cover (front)',
 432                          4 => 'Cover (back)',
 433                          5 => 'Leaflet page',
 434                          6 => 'Media (e.g. label side of CD)',
 435                          7 => 'Lead artist/lead performer/soloist',
 436                          8 => 'Artist/performer',
 437                          9 => 'Conductor',
 438                         10 => 'Band/Orchestra',
 439                         11 => 'Composer',
 440                         12 => 'Lyricist/text writer',
 441                         13 => 'Recording Location',
 442                         14 => 'During recording',
 443                         15 => 'During performance',
 444                         16 => 'Movie/video screen capture',
 445                         17 => 'A bright coloured fish',
 446                         18 => 'Illustration',
 447                         19 => 'Band/artist logotype',
 448                         20 => 'Publisher/Studio logotype',
 449                 );
 450                 return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved');
 451         }
 452
 453 }