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| 1 | <?php |
| 2 | /* vim: set expandtab tabstop=4 shiftwidth=4: */ |
| 3 | // +----------------------------------------------------------------------------+ |
| 4 | // | File_Ogg PEAR Package for Accessing Ogg Bitstreams | |
| 5 | // | Copyright (c) 2005-2007 | |
| 6 | // | David Grant <david@grant.org.uk> | |
| 7 | // | Tim Starling <tstarling@wikimedia.org> | |
| 8 | // +----------------------------------------------------------------------------+ |
| 9 | // | This library is free software; you can redistribute it and/or | |
| 10 | // | modify it under the terms of the GNU Lesser General Public | |
| 11 | // | License as published by the Free Software Foundation; either | |
| 12 | // | version 2.1 of the License, or (at your option) any later version. | |
| 13 | // | | |
| 14 | // | This library is distributed in the hope that it will be useful, | |
| 15 | // | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 17 | // | Lesser General Public License for more details. | |
| 18 | // | | |
| 19 | // | You should have received a copy of the GNU Lesser General Public | |
| 20 | // | License along with this library; if not, write to the Free Software | |
| 21 | // | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 22 | // +----------------------------------------------------------------------------+ |
| 23 | |
| 24 | |
| 25 | /** |
| 26 | * Check number for the first header in a Vorbis stream. |
| 27 | * |
| 28 | * @access private |
| 29 | */ |
| 30 | |
| 31 | use MediaWiki\TimedMediaHandler\Handlers\OggHandler\OggException; |
| 32 | |
| 33 | define("OGG_VORBIS_IDENTIFICATION_HEADER", 1); |
| 34 | /** |
| 35 | * Check number for the second header in a Vorbis stream. |
| 36 | * |
| 37 | * @access private |
| 38 | */ |
| 39 | define("OGG_VORBIS_COMMENTS_HEADER", 3); |
| 40 | /** |
| 41 | * Check number for the third header in a Vorbis stream. |
| 42 | * |
| 43 | * @access private |
| 44 | */ |
| 45 | define("OGG_VORBIS_SETUP_HEADER", 5); |
| 46 | /** |
| 47 | * Error thrown if the stream appears to be corrupted. |
| 48 | * |
| 49 | * @access private |
| 50 | */ |
| 51 | define("OGG_VORBIS_ERROR_UNDECODABLE", OGG_ERROR_UNDECODABLE); |
| 52 | /** |
| 53 | * Error thrown if the user attempts to extract a comment using a comment key |
| 54 | * that does not exist. |
| 55 | * |
| 56 | * @access private |
| 57 | */ |
| 58 | define("OGG_VORBIS_ERROR_INVALID_COMMENT", 2); |
| 59 | |
| 60 | define("OGG_VORBIS_IDENTIFICATION_PAGE_OFFSET", 0); |
| 61 | define("OGG_VORBIS_COMMENTS_PAGE_OFFSET", 1); |
| 62 | |
| 63 | /** |
| 64 | * Error thrown if the user attempts to write a comment containing an illegal |
| 65 | * character |
| 66 | * |
| 67 | * @access private |
| 68 | */ |
| 69 | define("OGG_VORBIS_ERROR_ILLEGAL_COMMENT", 3); |
| 70 | |
| 71 | /** |
| 72 | * Extract the contents of a Vorbis logical stream. |
| 73 | * |
| 74 | * This class provides an interface to a Vorbis logical stream found within |
| 75 | * a Ogg stream. A variety of information may be extracted, including comment |
| 76 | * tags, running time, and bitrate. For more information, please see the following |
| 77 | * links. |
| 78 | * |
| 79 | * @author David Grant <david@grant.org.uk>, Tim Starling <tstarling@wikimedia.org> |
| 80 | * @category File |
| 81 | * @copyright David Grant <david@grant.org.uk>, Tim Starling <tstarling@wikimedia.org> |
| 82 | * @license http://www.gnu.org/copyleft/lesser.html GNU LGPL |
| 83 | * @link http://pear.php.net/package/File_Ogg |
| 84 | * @link http://www.xiph.org/vorbis/doc/ |
| 85 | * @package File_Ogg |
| 86 | * @version CVS: $Id: Vorbis.php,v 1.13 2005/11/19 09:06:32 djg Exp $ |
| 87 | */ |
| 88 | class File_Ogg_Vorbis extends File_Ogg_Media |
| 89 | { |
| 90 | |
| 91 | /** |
| 92 | * Version of vorbis specification used. |
| 93 | * |
| 94 | * @access private |
| 95 | * @var int |
| 96 | */ |
| 97 | var $_version; |
| 98 | |
| 99 | /** |
| 100 | * Number of channels in the vorbis stream. |
| 101 | * |
| 102 | * @access private |
| 103 | * @var int |
| 104 | */ |
| 105 | var $_channels; |
| 106 | |
| 107 | /** |
| 108 | * Vorbis Identification Header |
| 109 | * https://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-610004.2 |
| 110 | * |
| 111 | * @access private |
| 112 | * @var array |
| 113 | */ |
| 114 | var $_idHeader; |
| 115 | |
| 116 | /** |
| 117 | * Number of samples per second in the vorbis stream. |
| 118 | * |
| 119 | * @access private |
| 120 | * @var int |
| 121 | */ |
| 122 | var $_sampleRate; |
| 123 | |
| 124 | /** |
| 125 | * Minimum bitrate for the vorbis stream. |
| 126 | * |
| 127 | * @access private |
| 128 | * @var int |
| 129 | */ |
| 130 | var $_minBitrate; |
| 131 | |
| 132 | /** |
| 133 | * Maximum bitrate for the vorbis stream. |
| 134 | * |
| 135 | * @access private |
| 136 | * @var int |
| 137 | */ |
| 138 | var $_maxBitrate; |
| 139 | |
| 140 | /** |
| 141 | * Nominal bitrate for the vorbis stream. |
| 142 | * |
| 143 | * @access private |
| 144 | * @var int |
| 145 | */ |
| 146 | var $_nomBitrate; |
| 147 | |
| 148 | /** |
| 149 | * The length of this stream in seconds. |
| 150 | * |
| 151 | * @access private |
| 152 | * @var int |
| 153 | */ |
| 154 | var $_streamLength; |
| 155 | |
| 156 | /** |
| 157 | * the start offset of this stream in seconds |
| 158 | */ |
| 159 | var $_startOffset; |
| 160 | /** |
| 161 | * Constructor for accessing a Vorbis logical stream. |
| 162 | * |
| 163 | * This method is the constructor for the native-PHP interface to a Vorbis logical |
| 164 | * stream, embedded within an Ogg physical stream. |
| 165 | * |
| 166 | * @param int $streamSerial Serial number of the logical stream. |
| 167 | * @param array $streamData Data for the requested logical stream. |
| 168 | * @param resource $filePointer File pointer for the current physical stream. |
| 169 | * @access private |
| 170 | */ |
| 171 | function __construct($streamSerial, $streamData, $filePointer) |
| 172 | { |
| 173 | parent::__construct($streamSerial, $streamData, $filePointer); |
| 174 | $this->_decodeIdentificationHeader(); |
| 175 | $this->_decodeCommentsHeader(OGG_VORBIS_COMMENTS_HEADER, OGG_VORBIS_COMMENTS_PAGE_OFFSET); |
| 176 | |
| 177 | $endSec = $this->getSecondsFromGranulePos( $this->_lastGranulePos ); |
| 178 | $startSec = $this->getSecondsFromGranulePos( $this->_firstGranulePos ); |
| 179 | |
| 180 | //make sure the offset is worth taking into account oggz_chop related hack |
| 181 | if( $startSec > 1){ |
| 182 | $this->_streamLength = $endSec - $startSec; |
| 183 | $this->_startOffset = $startSec; |
| 184 | }else{ |
| 185 | $this->_streamLength = $endSec; |
| 186 | } |
| 187 | |
| 188 | $this->_avgBitrate = $this->_streamLength ? ($this->_streamSize * 8) / $this->_streamLength : 0; |
| 189 | } |
| 190 | function getSecondsFromGranulePos( $granulePos ){ |
| 191 | return (intval(substr( $granulePos, 0, 8 ), 16) * pow(2, 32) |
| 192 | + intval( substr( $granulePos, 8, 8 ), 16 )) |
| 193 | / $this->_idHeader['audio_sample_rate']; |
| 194 | } |
| 195 | /** |
| 196 | * Get a short string describing the type of the stream |
| 197 | */ |
| 198 | function getType() |
| 199 | { |
| 200 | return 'Vorbis'; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Parse the identification header (the first of three headers) in a Vorbis stream. |
| 205 | * |
| 206 | * This function parses the identification header. The identification header |
| 207 | * contains simple audio characteristics, such as sample rate and number of |
| 208 | * channels. There are a number of error-checking provisions laid down in the Vorbis |
| 209 | * specification to ensure the stream is pure. |
| 210 | * |
| 211 | * @access private |
| 212 | */ |
| 213 | function _decodeIdentificationHeader() |
| 214 | { |
| 215 | $this->_decodeCommonHeader(OGG_VORBIS_IDENTIFICATION_HEADER, OGG_VORBIS_IDENTIFICATION_PAGE_OFFSET); |
| 216 | |
| 217 | $h = File_Ogg::_readLittleEndian($this->_filePointer, array( |
| 218 | 'vorbis_version' => 32, |
| 219 | 'audio_channels' => 8, |
| 220 | 'audio_sample_rate' => 32, |
| 221 | 'bitrate_maximum' => 32, |
| 222 | 'bitrate_nominal' => 32, |
| 223 | 'bitrate_minimum' => 32, |
| 224 | 'blocksize_0' => 4, |
| 225 | 'blocksize_1' => 4, |
| 226 | 'framing_flag' => 1 |
| 227 | )); |
| 228 | |
| 229 | // The Vorbis stream version must be 0. |
| 230 | if ($h['vorbis_version'] == 0) |
| 231 | $this->_version = $h['vorbis_version']; |
| 232 | else |
| 233 | throw new OggException("Stream is undecodable due to an invalid vorbis stream version.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 234 | |
| 235 | // The number of channels MUST be greater than 0. |
| 236 | if ($h['audio_channels'] == 0) |
| 237 | throw new OggException("Stream is undecodable due to zero channels.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 238 | else |
| 239 | $this->_channels = $h['audio_channels']; |
| 240 | |
| 241 | // The sample rate MUST be greater than 0. |
| 242 | if ($h['audio_sample_rate'] == 0) |
| 243 | throw new OggException("Stream is undecodable due to a zero sample rate.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 244 | else |
| 245 | $this->_sampleRate = $h['audio_sample_rate']; |
| 246 | |
| 247 | // Extract the various bitrates |
| 248 | $this->_maxBitrate = $h['bitrate_maximum']; |
| 249 | $this->_nomBitrate = $h['bitrate_nominal']; |
| 250 | $this->_minBitrate = $h['bitrate_minimum']; |
| 251 | |
| 252 | // Powers of two between 6 and 13 inclusive. |
| 253 | $valid_block_sizes = array(64, 128, 256, 512, 1024, 2048, 4096, 8192); |
| 254 | |
| 255 | // blocksize_0 MUST be a valid blocksize. |
| 256 | $blocksize_0 = pow(2, $h['blocksize_0']); |
| 257 | if (!in_array($blocksize_0, $valid_block_sizes)) |
| 258 | throw new OggException("Stream is undecodable because blocksize_0 is $blocksize_0, which is not a valid size.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 259 | |
| 260 | // Extract bits 5 to 8 from the character data. |
| 261 | // blocksize_1 MUST be a valid blocksize. |
| 262 | $blocksize_1 = pow(2, $h['blocksize_1']); |
| 263 | if (!in_array($blocksize_1, $valid_block_sizes)) |
| 264 | throw new OggException("Stream is undecodable because blocksize_1 is not a valid size.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 265 | |
| 266 | // blocksize 0 MUST be less than or equal to blocksize 1. |
| 267 | if ($blocksize_0 > $blocksize_1) |
| 268 | throw new OggException("Stream is undecodable because blocksize_0 is not less than or equal to blocksize_1.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 269 | |
| 270 | // The framing bit MUST be set to mark the end of the identification header. |
| 271 | // Some encoders are broken though -- TS |
| 272 | /* |
| 273 | if ($h['framing_flag'] == 0) |
| 274 | throw new OggException("Stream in undecodable because the framing bit is not non-zero.", OGG_VORBIS_ERROR_UNDECODABLE); |
| 275 | */ |
| 276 | |
| 277 | $this->_idHeader = $h; |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * Decode the comments header |
| 282 | * @access private |
| 283 | * @param int $packetType |
| 284 | * @param int $pageOffset |
| 285 | */ |
| 286 | function _decodeCommentsHeader($packetType, $pageOffset) |
| 287 | { |
| 288 | $this->_decodeCommonHeader($packetType, $pageOffset); |
| 289 | $this->_decodeBareCommentsHeader(); |
| 290 | // The framing bit MUST be set to mark the end of the comments header. |
| 291 | $framing_bit = unpack("Cdata", fread($this->_filePointer, 1)); |
| 292 | if ($framing_bit['data'] != 1) |
| 293 | throw new OggException("Stream Undecodable", OGG_VORBIS_ERROR_UNDECODABLE); |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Get the 6-byte identification string expected in the common header |
| 298 | */ |
| 299 | function getIdentificationString() { |
| 300 | return OGG_STREAM_CAPTURE_VORBIS; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Version of the Vorbis specification referred to in the encoding of this stream. |
| 305 | * |
| 306 | * This method returns the version of the Vorbis specification (currently 0 (ZERO)) |
| 307 | * referred to by the encoder of this stream. The Vorbis specification is well- |
| 308 | * defined, and thus one does not expect this value to change on a frequent basis. |
| 309 | * |
| 310 | * @access public |
| 311 | * @return int |
| 312 | */ |
| 313 | function getEncoderVersion() |
| 314 | { |
| 315 | return ($this->_version); |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * Samples per second. |
| 320 | * |
| 321 | * This function returns the number of samples used per second in this |
| 322 | * recording. Probably the most common value here is 44,100. |
| 323 | * |
| 324 | * @return int |
| 325 | * @access public |
| 326 | */ |
| 327 | function getSampleRate() |
| 328 | { |
| 329 | return ($this->_sampleRate); |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * Various bitrate measurements |
| 334 | * |
| 335 | * Gives an array of the values of four different types of bitrates for this |
| 336 | * stream. The nominal, maximum and minimum values are found within the file, |
| 337 | * whereas the average value is computed. |
| 338 | * |
| 339 | * @access public |
| 340 | * @return array |
| 341 | */ |
| 342 | function getBitrates() |
| 343 | { |
| 344 | return (array("nom" => $this->_nomBitrate, "max" => $this->_maxBitrate, "min" => $this->_minBitrate, "avg" => $this->_avgBitrate)); |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Gives the most accurate bitrate measurement from this stream. |
| 349 | * |
| 350 | * This function returns the most accurate bitrate measurement for this |
| 351 | * recording, depending on values set in the stream header. |
| 352 | * |
| 353 | * @access public |
| 354 | * @return float |
| 355 | */ |
| 356 | function getBitrate() |
| 357 | { |
| 358 | if ($this->_avgBitrate != 0) |
| 359 | return ($this->_avgBitrate); |
| 360 | elseif ($this->_nomBitrate != 0) |
| 361 | return ($this->_nomBitrate); |
| 362 | else |
| 363 | return (($this->_minBitrate + $this->_maxBitrate) / 2); |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * Gives the length (in seconds) of this stream. |
| 368 | * |
| 369 | * @access public |
| 370 | * @return int |
| 371 | */ |
| 372 | function getLength() |
| 373 | { |
| 374 | return ($this->_streamLength); |
| 375 | } |
| 376 | /** |
| 377 | * Get the start offset of the stream in seconds |
| 378 | * @access public |
| 379 | * @return int |
| 380 | */ |
| 381 | function getStartOffset(){ |
| 382 | return ($this->_startOffset); |
| 383 | } |
| 384 | /** |
| 385 | * States whether this logical stream was encoded in mono. |
| 386 | * |
| 387 | * @access public |
| 388 | * @return boolean |
| 389 | */ |
| 390 | function isMono() |
| 391 | { |
| 392 | return ($this->_channels == 1); |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * States whether this logical stream was encoded in stereo. |
| 397 | * |
| 398 | * @access public |
| 399 | * @return boolean |
| 400 | */ |
| 401 | function isStereo() |
| 402 | { |
| 403 | return ($this->_channels == 2); |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * States whether this logical stream was encoded in quadrophonic sound. |
| 408 | * |
| 409 | * @access public |
| 410 | * @return boolean |
| 411 | */ |
| 412 | function isQuadrophonic() |
| 413 | { |
| 414 | return ($this->_channels == 4); |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * The title of this track, e.g. "What's Up Pussycat?". |
| 419 | * |
| 420 | * @access public |
| 421 | * @return string |
| 422 | */ |
| 423 | function getTitle() |
| 424 | { |
| 425 | return ($this->getField("TITLE")); |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * The version of the track, such as a remix. |
| 430 | * |
| 431 | * @access public |
| 432 | * @return string |
| 433 | */ |
| 434 | function getVersion() |
| 435 | { |
| 436 | return $this->getField("VERSION"); |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * The album or collection from which this track comes. |
| 441 | * |
| 442 | * @access public |
| 443 | * @return string |
| 444 | */ |
| 445 | function getAlbum() |
| 446 | { |
| 447 | return ($this->getField("ALBUM")); |
| 448 | } |
| 449 | |
| 450 | /** |
| 451 | * The number of this track if it is part of a larger collection. |
| 452 | * |
| 453 | * @access public |
| 454 | * @return string |
| 455 | */ |
| 456 | function getTrackNumber() |
| 457 | { |
| 458 | return ($this->getField("TRACKNUMBER")); |
| 459 | } |
| 460 | |
| 461 | /** |
| 462 | * The artist responsible for this track. |
| 463 | * |
| 464 | * This function returns the name of the artist responsible for this |
| 465 | * recording, which may be either a solo-artist, duet or group. |
| 466 | * |
| 467 | * @access public |
| 468 | * @return string |
| 469 | */ |
| 470 | function getArtist() |
| 471 | { |
| 472 | return ($this->getField("ARTIST")); |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * The performer of this track, such as an orchestra |
| 477 | * |
| 478 | * @access public |
| 479 | * @return string |
| 480 | */ |
| 481 | function getPerformer() |
| 482 | { |
| 483 | return ($this->getField("PERFORMER")); |
| 484 | } |
| 485 | |
| 486 | /** |
| 487 | * The copyright attribution for this track. |
| 488 | * |
| 489 | * @access public |
| 490 | * @return string |
| 491 | */ |
| 492 | function getCopyright() |
| 493 | { |
| 494 | return ($this->getField("COPYRIGHT")); |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * The rights of distribution for this track. |
| 499 | * |
| 500 | * This funtion returns the license for this track, and may include |
| 501 | * copyright information, or a creative commons statement. |
| 502 | * |
| 503 | * @access public |
| 504 | * @return string |
| 505 | */ |
| 506 | function getLicense() |
| 507 | { |
| 508 | return ($this->getField("LICENSE")); |
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * The organisation responsible for this track. |
| 513 | * |
| 514 | * This function returns the name of the organisation responsible for |
| 515 | * the production of this track, such as the record label. |
| 516 | * |
| 517 | * @access public |
| 518 | * @return string |
| 519 | */ |
| 520 | function getOrganization() |
| 521 | { |
| 522 | return ($this->getField("ORGANIZATION")); |
| 523 | } |
| 524 | |
| 525 | /** |
| 526 | * A short description of the contents of this track. |
| 527 | * |
| 528 | * This function returns a short description of this track, which might |
| 529 | * contain extra information that doesn't fit anywhere else. |
| 530 | * |
| 531 | * @access public |
| 532 | * @return string |
| 533 | */ |
| 534 | function getDescription() |
| 535 | { |
| 536 | return ($this->getField("DESCRIPTION")); |
| 537 | } |
| 538 | |
| 539 | /** |
| 540 | * The genre of this recording (e.g. Rock) |
| 541 | * |
| 542 | * This function returns the genre of this recording. There are no pre- |
| 543 | * defined genres, so this is completely up to the tagging software. |
| 544 | * |
| 545 | * @access public |
| 546 | * @return string |
| 547 | */ |
| 548 | function getGenre() |
| 549 | { |
| 550 | return ($this->getField("GENRE")); |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | * The date of the recording of this track. |
| 555 | * |
| 556 | * This function returns the date on which this recording was made. There |
| 557 | * is no specification for the format of this date. |
| 558 | * |
| 559 | * @access public |
| 560 | * @return string |
| 561 | */ |
| 562 | function getDate() |
| 563 | { |
| 564 | return ($this->getField("DATE")); |
| 565 | } |
| 566 | |
| 567 | /** |
| 568 | * Where this recording was made. |
| 569 | * |
| 570 | * This function returns where this recording was made, such as a recording |
| 571 | * studio, or concert venue. |
| 572 | * |
| 573 | * @access public |
| 574 | * @return string |
| 575 | */ |
| 576 | function getLocation() |
| 577 | { |
| 578 | return ($this->getField("LOCATION")); |
| 579 | } |
| 580 | |
| 581 | /** |
| 582 | * @access public |
| 583 | * @return string |
| 584 | */ |
| 585 | function getContact() |
| 586 | { |
| 587 | return ($this->getField("CONTACT")); |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * International Standard Recording Code. |
| 592 | * |
| 593 | * Returns the International Standard Recording Code. This code can be |
| 594 | * validated using the Validate_ISPN package. |
| 595 | * |
| 596 | * @access public |
| 597 | * @return string |
| 598 | */ |
| 599 | function getIsrc() |
| 600 | { |
| 601 | return ($this->getField("ISRC")); |
| 602 | } |
| 603 | |
| 604 | /** |
| 605 | * Get an associative array containing header information about the stream |
| 606 | * @access public |
| 607 | * @return array |
| 608 | */ |
| 609 | function getHeader() { |
| 610 | return $this->_idHeader; |
| 611 | } |
| 612 | } |
| 613 | ?> |