wp-includes/ID3/module.audio-video.flv.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 //                                                             //
   7 //  FLV module by Seth Kaufman <sethØwhirl-i-gig*com>          //
   8 //                                                             //
   9 //  * version 0.1 (26 June 2005)                               //
  10 //                                                             //
  11 //                                                             //
  12 //  * version 0.1.1 (15 July 2005)                             //
  13 //  minor modifications by James Heinrich <info@getid3.org>    //
  14 //                                                             //
  15 //  * version 0.2 (22 February 2006)                           //
  16 //  Support for On2 VP6 codec and meta information             //
  17 //    by Steve Webster <steve.websterØfeaturecreep*com>        //
  18 //                                                             //
  19 //  * version 0.3 (15 June 2006)                               //
  20 //  Modified to not read entire file into memory               //
  21 //    by James Heinrich <info@getid3.org>                      //
  22 //                                                             //
  23 //  * version 0.4 (07 December 2007)                           //
  24 //  Bugfixes for incorrectly parsed FLV dimensions             //
  25 //    and incorrect parsing of onMetaTag                       //
  26 //    by Evgeny Moysevich <moysevichØgmail*com>                //
  27 //                                                             //
  28 //  * version 0.5 (21 May 2009)                                //
  29 //  Fixed parsing of audio tags and added additional codec     //
  30 //    details. The duration is now read from onMetaTag (if     //
  31 //    exists), rather than parsing whole file                  //
  32 //    by Nigel Barnes <ngbarnesØhotmail*com>                   //
  33 //                                                             //
  34 //  * version 0.6 (24 May 2009)                                //
  35 //  Better parsing of files with h264 video                    //
  36 //    by Evgeny Moysevich <moysevichØgmail*com>                //
  37 //                                                             //
  38 //  * version 0.6.1 (30 May 2011)                              //
  39 //    prevent infinite loops in expGolombUe()                  //
  40 //                                                             //
  41 /////////////////////////////////////////////////////////////////
  42 //                                                             //
  43 // module.audio-video.flv.php                                  //
  44 // module for analyzing Shockwave Flash Video files            //
  45 // dependencies: NONE                                          //
  46 //                                                            ///
  47 /////////////////////////////////////////////////////////////////
  48
  49 define('GETID3_FLV_TAG_AUDIO',          8);
  50 define('GETID3_FLV_TAG_VIDEO',          9);
  51 define('GETID3_FLV_TAG_META',          18);
  52
  53 define('GETID3_FLV_VIDEO_H263',         2);
  54 define('GETID3_FLV_VIDEO_SCREEN',       3);
  55 define('GETID3_FLV_VIDEO_VP6FLV',       4);
  56 define('GETID3_FLV_VIDEO_VP6FLV_ALPHA', 5);
  57 define('GETID3_FLV_VIDEO_SCREENV2',     6);
  58 define('GETID3_FLV_VIDEO_H264',         7);
  59
  60 define('H264_AVC_SEQUENCE_HEADER',          0);
  61 define('H264_PROFILE_BASELINE',            66);
  62 define('H264_PROFILE_MAIN',                77);
  63 define('H264_PROFILE_EXTENDED',            88);
  64 define('H264_PROFILE_HIGH',               100);
  65 define('H264_PROFILE_HIGH10',             110);
  66 define('H264_PROFILE_HIGH422',            122);
  67 define('H264_PROFILE_HIGH444',            144);
  68 define('H264_PROFILE_HIGH444_PREDICTIVE', 244);
  69
  70 class getid3_flv extends getid3_handler
  71 {
  72         public $max_frames = 100000; // break out of the loop if too many frames have been scanned; only scan this many if meta frame does not contain useful duration
  73
  74         public function Analyze() {
  75                 $info = &$this->getid3->info;
  76
  77                 fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
  78
  79                 $FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
  80                 $FLVheader = fread($this->getid3->fp, 5);
  81
  82                 $info['fileformat'] = 'flv';
  83                 $info['flv']['header']['signature'] =                           substr($FLVheader, 0, 3);
  84                 $info['flv']['header']['version']   = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
  85                 $TypeFlags                          = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));
  86
  87                 $magic = 'FLV';
  88                 if ($info['flv']['header']['signature'] != $magic) {
  89                         $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['flv']['header']['signature']).'"';
  90                         unset($info['flv']);
  91                         unset($info['fileformat']);
  92                         return false;
  93                 }
  94
  95                 $info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x04);
  96                 $info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x01);
  97
  98                 $FrameSizeDataLength = getid3_lib::BigEndian2Int(fread($this->getid3->fp, 4));
  99                 $FLVheaderFrameLength = 9;
 100                 if ($FrameSizeDataLength > $FLVheaderFrameLength) {
 101                         fseek($this->getid3->fp, $FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
 102                 }
 103                 $Duration = 0;
 104                 $found_video = false;
 105                 $found_audio = false;
 106                 $found_meta  = false;
 107                 $found_valid_meta_playtime = false;
 108                 $tagParseCount = 0;
 109                 $info['flv']['framecount'] = array('total'=>0, 'audio'=>0, 'video'=>0);
 110                 $flv_framecount = &$info['flv']['framecount'];
 111                 while (((ftell($this->getid3->fp) + 16) < $info['avdataend']) && (($tagParseCount++ <= $this->max_frames) || !$found_valid_meta_playtime))  {
 112                         $ThisTagHeader = fread($this->getid3->fp, 16);
 113
 114                         $PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  0, 4));
 115                         $TagType           = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  4, 1));
 116                         $DataLength        = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  5, 3));
 117                         $Timestamp         = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  8, 3));
 118                         $LastHeaderByte    = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
 119                         $NextOffset = ftell($this->getid3->fp) - 1 + $DataLength;
 120                         if ($Timestamp > $Duration) {
 121                                 $Duration = $Timestamp;
 122                         }
 123
 124                         $flv_framecount['total']++;
 125                         switch ($TagType) {
 126                                 case GETID3_FLV_TAG_AUDIO:
 127                                         $flv_framecount['audio']++;
 128                                         if (!$found_audio) {
 129                                                 $found_audio = true;
 130                                                 $info['flv']['audio']['audioFormat']     = ($LastHeaderByte >> 4) & 0x0F;
 131                                                 $info['flv']['audio']['audioRate']       = ($LastHeaderByte >> 2) & 0x03;
 132                                                 $info['flv']['audio']['audioSampleSize'] = ($LastHeaderByte >> 1) & 0x01;
 133                                                 $info['flv']['audio']['audioType']       =  $LastHeaderByte       & 0x01;
 134                                         }
 135                                         break;
 136
 137                                 case GETID3_FLV_TAG_VIDEO:
 138                                         $flv_framecount['video']++;
 139                                         if (!$found_video) {
 140                                                 $found_video = true;
 141                                                 $info['flv']['video']['videoCodec'] = $LastHeaderByte & 0x07;
 142
 143                                                 $FLVvideoHeader = fread($this->getid3->fp, 11);
 144
 145                                                 if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
 146                                                         // this code block contributed by: moysevichØgmail*com
 147
 148                                                         $AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
 149                                                         if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
 150                                                                 //      read AVCDecoderConfigurationRecord
 151                                                                 $configurationVersion       = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  4, 1));
 152                                                                 $AVCProfileIndication       = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  5, 1));
 153                                                                 $profile_compatibility      = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  6, 1));
 154                                                                 $lengthSizeMinusOne         = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  7, 1));
 155                                                                 $numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  8, 1));
 156
 157                                                                 if (($numOfSequenceParameterSets & 0x1F) != 0) {
 158                                                                         //      there is at least one SequenceParameterSet
 159                                                                         //      read size of the first SequenceParameterSet
 160                                                                         //$spsSize = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 9, 2));
 161                                                                         $spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
 162                                                                         //      read the first SequenceParameterSet
 163                                                                         $sps = fread($this->getid3->fp, $spsSize);
 164                                                                         if (strlen($sps) == $spsSize) { //      make sure that whole SequenceParameterSet was red
 165                                                                                 $spsReader = new AVCSequenceParameterSetReader($sps);
 166                                                                                 $spsReader->readData();
 167                                                                                 $info['video']['resolution_x'] = $spsReader->getWidth();
 168                                                                                 $info['video']['resolution_y'] = $spsReader->getHeight();
 169                                                                         }
 170                                                                 }
 171                                                         }
 172                                                         // end: moysevichØgmail*com
 173
 174                                                 } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H263) {
 175
 176                                                         $PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2))) >> 7;
 177                                                         $PictureSizeType = $PictureSizeType & 0x0007;
 178                                                         $info['flv']['header']['videoSizeType'] = $PictureSizeType;
 179                                                         switch ($PictureSizeType) {
 180                                                                 case 0:
 181                                                                         //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
 182                                                                         //$PictureSizeEnc <<= 1;
 183                                                                         //$info['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8;
 184                                                                         //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
 185                                                                         //$PictureSizeEnc <<= 1;
 186                                                                         //$info['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8;
 187
 188                                                                         $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2));
 189                                                                         $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
 190                                                                         $PictureSizeEnc['x'] >>= 7;
 191                                                                         $PictureSizeEnc['y'] >>= 7;
 192                                                                         $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFF;
 193                                                                         $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFF;
 194                                                                         break;
 195
 196                                                                 case 1:
 197                                                                         $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3));
 198                                                                         $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3));
 199                                                                         $PictureSizeEnc['x'] >>= 7;
 200                                                                         $PictureSizeEnc['y'] >>= 7;
 201                                                                         $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFFFF;
 202                                                                         $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFFFF;
 203                                                                         break;
 204
 205                                                                 case 2:
 206                                                                         $info['video']['resolution_x'] = 352;
 207                                                                         $info['video']['resolution_y'] = 288;
 208                                                                         break;
 209
 210                                                                 case 3:
 211                                                                         $info['video']['resolution_x'] = 176;
 212                                                                         $info['video']['resolution_y'] = 144;
 213                                                                         break;
 214
 215                                                                 case 4:
 216                                                                         $info['video']['resolution_x'] = 128;
 217                                                                         $info['video']['resolution_y'] = 96;
 218                                                                         break;
 219
 220                                                                 case 5:
 221                                                                         $info['video']['resolution_x'] = 320;
 222                                                                         $info['video']['resolution_y'] = 240;
 223                                                                         break;
 224
 225                                                                 case 6:
 226                                                                         $info['video']['resolution_x'] = 160;
 227                                                                         $info['video']['resolution_y'] = 120;
 228                                                                         break;
 229
 230                                                                 default:
 231                                                                         $info['video']['resolution_x'] = 0;
 232                                                                         $info['video']['resolution_y'] = 0;
 233                                                                         break;
 234
 235                                                         }
 236                                                 }
 237                                                 $info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y'];
 238                                         }
 239                                         break;
 240
 241                                 // Meta tag
 242                                 case GETID3_FLV_TAG_META:
 243                                         if (!$found_meta) {
 244                                                 $found_meta = true;
 245                                                 fseek($this->getid3->fp, -1, SEEK_CUR);
 246                                                 $datachunk = fread($this->getid3->fp, $DataLength);
 247                                                 $AMFstream = new AMFStream($datachunk);
 248                                                 $reader = new AMFReader($AMFstream);
 249                                                 $eventName = $reader->readData();
 250                                                 $info['flv']['meta'][$eventName] = $reader->readData();
 251                                                 unset($reader);
 252
 253                                                 $copykeys = array('framerate'=>'frame_rate', 'width'=>'resolution_x', 'height'=>'resolution_y', 'audiodatarate'=>'bitrate', 'videodatarate'=>'bitrate');
 254                                                 foreach ($copykeys as $sourcekey => $destkey) {
 255                                                         if (isset($info['flv']['meta']['onMetaData'][$sourcekey])) {
 256                                                                 switch ($sourcekey) {
 257                                                                         case 'width':
 258                                                                         case 'height':
 259                                                                                 $info['video'][$destkey] = intval(round($info['flv']['meta']['onMetaData'][$sourcekey]));
 260                                                                                 break;
 261                                                                         case 'audiodatarate':
 262                                                                                 $info['audio'][$destkey] = getid3_lib::CastAsInt(round($info['flv']['meta']['onMetaData'][$sourcekey] * 1000));
 263                                                                                 break;
 264                                                                         case 'videodatarate':
 265                                                                         case 'frame_rate':
 266                                                                         default:
 267                                                                                 $info['video'][$destkey] = $info['flv']['meta']['onMetaData'][$sourcekey];
 268                                                                                 break;
 269                                                                 }
 270                                                         }
 271                                                 }
 272                                                 if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
 273                                                         $found_valid_meta_playtime = true;
 274                                                 }
 275                                         }
 276                                         break;
 277
 278                                 default:
 279                                         // noop
 280                                         break;
 281                         }
 282                         fseek($this->getid3->fp, $NextOffset, SEEK_SET);
 283                 }
 284
 285                 $info['playtime_seconds'] = $Duration / 1000;
 286                 if ($info['playtime_seconds'] > 0) {
 287                         $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 288                 }
 289
 290                 if ($info['flv']['header']['hasAudio']) {
 291                         $info['audio']['codec']           =   $this->FLVaudioFormat($info['flv']['audio']['audioFormat']);
 292                         $info['audio']['sample_rate']     =     $this->FLVaudioRate($info['flv']['audio']['audioRate']);
 293                         $info['audio']['bits_per_sample'] = $this->FLVaudioBitDepth($info['flv']['audio']['audioSampleSize']);
 294
 295                         $info['audio']['channels']   =  $info['flv']['audio']['audioType'] + 1; // 0=mono,1=stereo
 296                         $info['audio']['lossless']   = ($info['flv']['audio']['audioFormat'] ? false : true); // 0=uncompressed
 297                         $info['audio']['dataformat'] = 'flv';
 298                 }
 299                 if (!empty($info['flv']['header']['hasVideo'])) {
 300                         $info['video']['codec']      = $this->FLVvideoCodec($info['flv']['video']['videoCodec']);
 301                         $info['video']['dataformat'] = 'flv';
 302                         $info['video']['lossless']   = false;
 303                 }
 304
 305                 // Set information from meta
 306                 if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
 307                         $info['playtime_seconds'] = $info['flv']['meta']['onMetaData']['duration'];
 308                         $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 309                 }
 310                 if (isset($info['flv']['meta']['onMetaData']['audiocodecid'])) {
 311                         $info['audio']['codec'] = $this->FLVaudioFormat($info['flv']['meta']['onMetaData']['audiocodecid']);
 312                 }
 313                 if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
 314                         $info['video']['codec'] = $this->FLVvideoCodec($info['flv']['meta']['onMetaData']['videocodecid']);
 315                 }
 316                 return true;
 317         }
 318
 319
 320         public function FLVaudioFormat($id) {
 321                 $FLVaudioFormat = array(
 322                         0  => 'Linear PCM, platform endian',
 323                         1  => 'ADPCM',
 324                         2  => 'mp3',
 325                         3  => 'Linear PCM, little endian',
 326                         4  => 'Nellymoser 16kHz mono',
 327                         5  => 'Nellymoser 8kHz mono',
 328                         6  => 'Nellymoser',
 329                         7  => 'G.711A-law logarithmic PCM',
 330                         8  => 'G.711 mu-law logarithmic PCM',
 331                         9  => 'reserved',
 332                         10 => 'AAC',
 333                         11 => false, // unknown?
 334                         12 => false, // unknown?
 335                         13 => false, // unknown?
 336                         14 => 'mp3 8kHz',
 337                         15 => 'Device-specific sound',
 338                 );
 339                 return (isset($FLVaudioFormat[$id]) ? $FLVaudioFormat[$id] : false);
 340         }
 341
 342         public function FLVaudioRate($id) {
 343                 $FLVaudioRate = array(
 344                         0 =>  5500,
 345                         1 => 11025,
 346                         2 => 22050,
 347                         3 => 44100,
 348                 );
 349                 return (isset($FLVaudioRate[$id]) ? $FLVaudioRate[$id] : false);
 350         }
 351
 352         public function FLVaudioBitDepth($id) {
 353                 $FLVaudioBitDepth = array(
 354                         0 =>  8,
 355                         1 => 16,
 356                 );
 357                 return (isset($FLVaudioBitDepth[$id]) ? $FLVaudioBitDepth[$id] : false);
 358         }
 359
 360         public function FLVvideoCodec($id) {
 361                 $FLVvideoCodec = array(
 362                         GETID3_FLV_VIDEO_H263         => 'Sorenson H.263',
 363                         GETID3_FLV_VIDEO_SCREEN       => 'Screen video',
 364                         GETID3_FLV_VIDEO_VP6FLV       => 'On2 VP6',
 365                         GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel',
 366                         GETID3_FLV_VIDEO_SCREENV2     => 'Screen video v2',
 367                         GETID3_FLV_VIDEO_H264         => 'Sorenson H.264',
 368                 );
 369                 return (isset($FLVvideoCodec[$id]) ? $FLVvideoCodec[$id] : false);
 370         }
 371 }
 372
 373 class AMFStream {
 374         public $bytes;
 375         public $pos;
 376
 377         public function AMFStream(&$bytes) {
 378                 $this->bytes =& $bytes;
 379                 $this->pos = 0;
 380         }
 381
 382         public function readByte() {
 383                 return getid3_lib::BigEndian2Int(substr($this->bytes, $this->pos++, 1));
 384         }
 385
 386         public function readInt() {
 387                 return ($this->readByte() << 8) + $this->readByte();
 388         }
 389
 390         public function readLong() {
 391                 return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
 392         }
 393
 394         public function readDouble() {
 395                 return getid3_lib::BigEndian2Float($this->read(8));
 396         }
 397
 398         public function readUTF() {
 399                 $length = $this->readInt();
 400                 return $this->read($length);
 401         }
 402
 403         public function readLongUTF() {
 404                 $length = $this->readLong();
 405                 return $this->read($length);
 406         }
 407
 408         public function read($length) {
 409                 $val = substr($this->bytes, $this->pos, $length);
 410                 $this->pos += $length;
 411                 return $val;
 412         }
 413
 414         public function peekByte() {
 415                 $pos = $this->pos;
 416                 $val = $this->readByte();
 417                 $this->pos = $pos;
 418                 return $val;
 419         }
 420
 421         public function peekInt() {
 422                 $pos = $this->pos;
 423                 $val = $this->readInt();
 424                 $this->pos = $pos;
 425                 return $val;
 426         }
 427
 428         public function peekLong() {
 429                 $pos = $this->pos;
 430                 $val = $this->readLong();
 431                 $this->pos = $pos;
 432                 return $val;
 433         }
 434
 435         public function peekDouble() {
 436                 $pos = $this->pos;
 437                 $val = $this->readDouble();
 438                 $this->pos = $pos;
 439                 return $val;
 440         }
 441
 442         public function peekUTF() {
 443                 $pos = $this->pos;
 444                 $val = $this->readUTF();
 445                 $this->pos = $pos;
 446                 return $val;
 447         }
 448
 449         public function peekLongUTF() {
 450                 $pos = $this->pos;
 451                 $val = $this->readLongUTF();
 452                 $this->pos = $pos;
 453                 return $val;
 454         }
 455 }
 456
 457 class AMFReader {
 458         public $stream;
 459
 460         public function AMFReader(&$stream) {
 461                 $this->stream =& $stream;
 462         }
 463
 464         public function readData() {
 465                 $value = null;
 466
 467                 $type = $this->stream->readByte();
 468                 switch ($type) {
 469
 470                         // Double
 471                         case 0:
 472                                 $value = $this->readDouble();
 473                         break;
 474
 475                         // Boolean
 476                         case 1:
 477                                 $value = $this->readBoolean();
 478                                 break;
 479
 480                         // String
 481                         case 2:
 482                                 $value = $this->readString();
 483                                 break;
 484
 485                         // Object
 486                         case 3:
 487                                 $value = $this->readObject();
 488                                 break;
 489
 490                         // null
 491                         case 6:
 492                                 return null;
 493                                 break;
 494
 495                         // Mixed array
 496                         case 8:
 497                                 $value = $this->readMixedArray();
 498                                 break;
 499
 500                         // Array
 501                         case 10:
 502                                 $value = $this->readArray();
 503                                 break;
 504
 505                         // Date
 506                         case 11:
 507                                 $value = $this->readDate();
 508                                 break;
 509
 510                         // Long string
 511                         case 13:
 512                                 $value = $this->readLongString();
 513                                 break;
 514
 515                         // XML (handled as string)
 516                         case 15:
 517                                 $value = $this->readXML();
 518                                 break;
 519
 520                         // Typed object (handled as object)
 521                         case 16:
 522                                 $value = $this->readTypedObject();
 523                                 break;
 524
 525                         // Long string
 526                         default:
 527                                 $value = '(unknown or unsupported data type)';
 528                         break;
 529                 }
 530
 531                 return $value;
 532         }
 533
 534         public function readDouble() {
 535                 return $this->stream->readDouble();
 536         }
 537
 538         public function readBoolean() {
 539                 return $this->stream->readByte() == 1;
 540         }
 541
 542         public function readString() {
 543                 return $this->stream->readUTF();
 544         }
 545
 546         public function readObject() {
 547                 // Get highest numerical index - ignored
 548 //              $highestIndex = $this->stream->readLong();
 549
 550                 $data = array();
 551
 552                 while ($key = $this->stream->readUTF()) {
 553                         $data[$key] = $this->readData();
 554                 }
 555                 // Mixed array record ends with empty string (0x00 0x00) and 0x09
 556                 if (($key == '') && ($this->stream->peekByte() == 0x09)) {
 557                         // Consume byte
 558                         $this->stream->readByte();
 559                 }
 560                 return $data;
 561         }
 562
 563         public function readMixedArray() {
 564                 // Get highest numerical index - ignored
 565                 $highestIndex = $this->stream->readLong();
 566
 567                 $data = array();
 568
 569                 while ($key = $this->stream->readUTF()) {
 570                         if (is_numeric($key)) {
 571                                 $key = (float) $key;
 572                         }
 573                         $data[$key] = $this->readData();
 574                 }
 575                 // Mixed array record ends with empty string (0x00 0x00) and 0x09
 576                 if (($key == '') && ($this->stream->peekByte() == 0x09)) {
 577                         // Consume byte
 578                         $this->stream->readByte();
 579                 }
 580
 581                 return $data;
 582         }
 583
 584         public function readArray() {
 585                 $length = $this->stream->readLong();
 586                 $data = array();
 587
 588                 for ($i = 0; $i < $length; $i++) {
 589                         $data[] = $this->readData();
 590                 }
 591                 return $data;
 592         }
 593
 594         public function readDate() {
 595                 $timestamp = $this->stream->readDouble();
 596                 $timezone = $this->stream->readInt();
 597                 return $timestamp;
 598         }
 599
 600         public function readLongString() {
 601                 return $this->stream->readLongUTF();
 602         }
 603
 604         public function readXML() {
 605                 return $this->stream->readLongUTF();
 606         }
 607
 608         public function readTypedObject() {
 609                 $className = $this->stream->readUTF();
 610                 return $this->readObject();
 611         }
 612 }
 613
 614 class AVCSequenceParameterSetReader {
 615         public $sps;
 616         public $start = 0;
 617         public $currentBytes = 0;
 618         public $currentBits = 0;
 619         public $width;
 620         public $height;
 621
 622         public function AVCSequenceParameterSetReader($sps) {
 623                 $this->sps = $sps;
 624         }
 625
 626         public function readData() {
 627                 $this->skipBits(8);
 628                 $this->skipBits(8);
 629                 $profile = $this->getBits(8);   //      read profile
 630                 $this->skipBits(16);
 631                 $this->expGolombUe();   //      read sps id
 632                 if (in_array($profile, array(H264_PROFILE_HIGH, H264_PROFILE_HIGH10, H264_PROFILE_HIGH422, H264_PROFILE_HIGH444, H264_PROFILE_HIGH444_PREDICTIVE))) {
 633                         if ($this->expGolombUe() == 3) {
 634                                 $this->skipBits(1);
 635                         }
 636                         $this->expGolombUe();
 637                         $this->expGolombUe();
 638                         $this->skipBits(1);
 639                         if ($this->getBit()) {
 640                                 for ($i = 0; $i < 8; $i++) {
 641                                         if ($this->getBit()) {
 642                                                 $size = $i < 6 ? 16 : 64;
 643                                                 $lastScale = 8;
 644                                                 $nextScale = 8;
 645                                                 for ($j = 0; $j < $size; $j++) {
 646                                                         if ($nextScale != 0) {
 647                                                                 $deltaScale = $this->expGolombUe();
 648                                                                 $nextScale = ($lastScale + $deltaScale + 256) % 256;
 649                                                         }
 650                                                         if ($nextScale != 0) {
 651                                                                 $lastScale = $nextScale;
 652                                                         }
 653                                                 }
 654                                         }
 655                                 }
 656                         }
 657                 }
 658                 $this->expGolombUe();
 659                 $pocType = $this->expGolombUe();
 660                 if ($pocType == 0) {
 661                         $this->expGolombUe();
 662                 } elseif ($pocType == 1) {
 663                         $this->skipBits(1);
 664                         $this->expGolombSe();
 665                         $this->expGolombSe();
 666                         $pocCycleLength = $this->expGolombUe();
 667                         for ($i = 0; $i < $pocCycleLength; $i++) {
 668                                 $this->expGolombSe();
 669                         }
 670                 }
 671                 $this->expGolombUe();
 672                 $this->skipBits(1);
 673                 $this->width = ($this->expGolombUe() + 1) * 16;
 674                 $heightMap = $this->expGolombUe() + 1;
 675                 $this->height = (2 - $this->getBit()) * $heightMap * 16;
 676         }
 677
 678         public function skipBits($bits) {
 679                 $newBits = $this->currentBits + $bits;
 680                 $this->currentBytes += (int)floor($newBits / 8);
 681                 $this->currentBits = $newBits % 8;
 682         }
 683
 684         public function getBit() {
 685                 $result = (getid3_lib::BigEndian2Int(substr($this->sps, $this->currentBytes, 1)) >> (7 - $this->currentBits)) & 0x01;
 686                 $this->skipBits(1);
 687                 return $result;
 688         }
 689
 690         public function getBits($bits) {
 691                 $result = 0;
 692                 for ($i = 0; $i < $bits; $i++) {
 693                         $result = ($result << 1) + $this->getBit();
 694                 }
 695                 return $result;
 696         }
 697
 698         public function expGolombUe() {
 699                 $significantBits = 0;
 700                 $bit = $this->getBit();
 701                 while ($bit == 0) {
 702                         $significantBits++;
 703                         $bit = $this->getBit();
 704
 705                         if ($significantBits > 31) {
 706                                 // something is broken, this is an emergency escape to prevent infinite loops
 707                                 return 0;
 708                         }
 709                 }
 710                 return (1 << $significantBits) + $this->getBits($significantBits) - 1;
 711         }
 712
 713         public function expGolombSe() {
 714                 $result = $this->expGolombUe();
 715                 if (($result & 0x01) == 0) {
 716                         return -($result >> 1);
 717                 } else {
 718                         return ($result + 1) >> 1;
 719                 }
 720         }
 721
 722         public function getWidth() {
 723                 return $this->width;
 724         }
 725
 726         public function getHeight() {
 727                 return $this->height;
 728         }
 729 }