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 //          also https://github.com/JamesHeinrich/getID3       //
   7 //                                                             //
   8 //  FLV module by Seth Kaufman <sethØwhirl-i-gig*com>          //
   9 //                                                             //
  10 //  * version 0.1 (26 June 2005)                               //
  11 //                                                             //
  12 //                                                             //
  13 //  * version 0.1.1 (15 July 2005)                             //
  14 //  minor modifications by James Heinrich <info@getid3.org>    //
  15 //                                                             //
  16 //  * version 0.2 (22 February 2006)                           //
  17 //  Support for On2 VP6 codec and meta information             //
  18 //    by Steve Webster <steve.websterØfeaturecreep*com>        //
  19 //                                                             //
  20 //  * version 0.3 (15 June 2006)                               //
  21 //  Modified to not read entire file into memory               //
  22 //    by James Heinrich <info@getid3.org>                      //
  23 //                                                             //
  24 //  * version 0.4 (07 December 2007)                           //
  25 //  Bugfixes for incorrectly parsed FLV dimensions             //
  26 //    and incorrect parsing of onMetaTag                       //
  27 //    by Evgeny Moysevich <moysevichØgmail*com>                //
  28 //                                                             //
  29 //  * version 0.5 (21 May 2009)                                //
  30 //  Fixed parsing of audio tags and added additional codec     //
  31 //    details. The duration is now read from onMetaTag (if     //
  32 //    exists), rather than parsing whole file                  //
  33 //    by Nigel Barnes <ngbarnesØhotmail*com>                   //
  34 //                                                             //
  35 //  * version 0.6 (24 May 2009)                                //
  36 //  Better parsing of files with h264 video                    //
  37 //    by Evgeny Moysevich <moysevichØgmail*com>                //
  38 //                                                             //
  39 //  * version 0.6.1 (30 May 2011)                              //
  40 //    prevent infinite loops in expGolombUe()                  //
  41 //                                                             //
  42 //  * version 0.7.0 (16 Jul 2013)                              //
  43 //  handle GETID3_FLV_VIDEO_VP6FLV_ALPHA                       //
  44 //  improved AVCSequenceParameterSetReader::readData()         //
  45 //    by Xander Schouwerwou <schouwerwouØgmail*com>            //
  46 //                                                             //
  47 /////////////////////////////////////////////////////////////////
  48 //                                                             //
  49 // module.audio-video.flv.php                                  //
  50 // module for analyzing Shockwave Flash Video files            //
  51 // dependencies: NONE                                          //
  52 //                                                            ///
  53 /////////////////////////////////////////////////////////////////
  54
  55 define('GETID3_FLV_TAG_AUDIO',          8);
  56 define('GETID3_FLV_TAG_VIDEO',          9);
  57 define('GETID3_FLV_TAG_META',          18);
  58
  59 define('GETID3_FLV_VIDEO_H263',         2);
  60 define('GETID3_FLV_VIDEO_SCREEN',       3);
  61 define('GETID3_FLV_VIDEO_VP6FLV',       4);
  62 define('GETID3_FLV_VIDEO_VP6FLV_ALPHA', 5);
  63 define('GETID3_FLV_VIDEO_SCREENV2',     6);
  64 define('GETID3_FLV_VIDEO_H264',         7);
  65
  66 define('H264_AVC_SEQUENCE_HEADER',          0);
  67 define('H264_PROFILE_BASELINE',            66);
  68 define('H264_PROFILE_MAIN',                77);
  69 define('H264_PROFILE_EXTENDED',            88);
  70 define('H264_PROFILE_HIGH',               100);
  71 define('H264_PROFILE_HIGH10',             110);
  72 define('H264_PROFILE_HIGH422',            122);
  73 define('H264_PROFILE_HIGH444',            144);
  74 define('H264_PROFILE_HIGH444_PREDICTIVE', 244);
  75
  76 class getid3_flv extends getid3_handler {
  77
  78         const magic = 'FLV';
  79
  80         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
  81
  82         public function Analyze() {
  83                 $info = &$this->getid3->info;
  84
  85                 $this->fseek($info['avdataoffset']);
  86
  87                 $FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
  88                 $FLVheader = $this->fread(5);
  89
  90                 $info['fileformat'] = 'flv';
  91                 $info['flv']['header']['signature'] =                           substr($FLVheader, 0, 3);
  92                 $info['flv']['header']['version']   = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
  93                 $TypeFlags                          = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));
  94
  95                 if ($info['flv']['header']['signature'] != self::magic) {
  96                         $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes(self::magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['flv']['header']['signature']).'"';
  97                         unset($info['flv'], $info['fileformat']);
  98                         return false;
  99                 }
 100
 101                 $info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x04);
 102                 $info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x01);
 103
 104                 $FrameSizeDataLength = getid3_lib::BigEndian2Int($this->fread(4));
 105                 $FLVheaderFrameLength = 9;
 106                 if ($FrameSizeDataLength > $FLVheaderFrameLength) {
 107                         $this->fseek($FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
 108                 }
 109                 $Duration = 0;
 110                 $found_video = false;
 111                 $found_audio = false;
 112                 $found_meta  = false;
 113                 $found_valid_meta_playtime = false;
 114                 $tagParseCount = 0;
 115                 $info['flv']['framecount'] = array('total'=>0, 'audio'=>0, 'video'=>0);
 116                 $flv_framecount = &$info['flv']['framecount'];
 117                 while ((($this->ftell() + 16) < $info['avdataend']) && (($tagParseCount++ <= $this->max_frames) || !$found_valid_meta_playtime))  {
 118                         $ThisTagHeader = $this->fread(16);
 119
 120                         $PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  0, 4));
 121                         $TagType           = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  4, 1));
 122                         $DataLength        = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  5, 3));
 123                         $Timestamp         = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  8, 3));
 124                         $LastHeaderByte    = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
 125                         $NextOffset = $this->ftell() - 1 + $DataLength;
 126                         if ($Timestamp > $Duration) {
 127                                 $Duration = $Timestamp;
 128                         }
 129
 130                         $flv_framecount['total']++;
 131                         switch ($TagType) {
 132                                 case GETID3_FLV_TAG_AUDIO:
 133                                         $flv_framecount['audio']++;
 134                                         if (!$found_audio) {
 135                                                 $found_audio = true;
 136                                                 $info['flv']['audio']['audioFormat']     = ($LastHeaderByte >> 4) & 0x0F;
 137                                                 $info['flv']['audio']['audioRate']       = ($LastHeaderByte >> 2) & 0x03;
 138                                                 $info['flv']['audio']['audioSampleSize'] = ($LastHeaderByte >> 1) & 0x01;
 139                                                 $info['flv']['audio']['audioType']       =  $LastHeaderByte       & 0x01;
 140                                         }
 141                                         break;
 142
 143                                 case GETID3_FLV_TAG_VIDEO:
 144                                         $flv_framecount['video']++;
 145                                         if (!$found_video) {
 146                                                 $found_video = true;
 147                                                 $info['flv']['video']['videoCodec'] = $LastHeaderByte & 0x07;
 148
 149                                                 $FLVvideoHeader = $this->fread(11);
 150
 151                                                 if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
 152                                                         // this code block contributed by: moysevichØgmail*com
 153
 154                                                         $AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
 155                                                         if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
 156                                                                 //      read AVCDecoderConfigurationRecord
 157                                                                 $configurationVersion       = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  4, 1));
 158                                                                 $AVCProfileIndication       = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  5, 1));
 159                                                                 $profile_compatibility      = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  6, 1));
 160                                                                 $lengthSizeMinusOne         = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  7, 1));
 161                                                                 $numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  8, 1));
 162
 163                                                                 if (($numOfSequenceParameterSets & 0x1F) != 0) {
 164                                                                         //      there is at least one SequenceParameterSet
 165                                                                         //      read size of the first SequenceParameterSet
 166                                                                         //$spsSize = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 9, 2));
 167                                                                         $spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
 168                                                                         //      read the first SequenceParameterSet
 169                                                                         $sps = $this->fread($spsSize);
 170                                                                         if (strlen($sps) == $spsSize) { //      make sure that whole SequenceParameterSet was red
 171                                                                                 $spsReader = new AVCSequenceParameterSetReader($sps);
 172                                                                                 $spsReader->readData();
 173                                                                                 $info['video']['resolution_x'] = $spsReader->getWidth();
 174                                                                                 $info['video']['resolution_y'] = $spsReader->getHeight();
 175                                                                         }
 176                                                                 }
 177                                                         }
 178                                                         // end: moysevichØgmail*com
 179
 180                                                 } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H263) {
 181
 182                                                         $PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2))) >> 7;
 183                                                         $PictureSizeType = $PictureSizeType & 0x0007;
 184                                                         $info['flv']['header']['videoSizeType'] = $PictureSizeType;
 185                                                         switch ($PictureSizeType) {
 186                                                                 case 0:
 187                                                                         //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
 188                                                                         //$PictureSizeEnc <<= 1;
 189                                                                         //$info['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8;
 190                                                                         //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
 191                                                                         //$PictureSizeEnc <<= 1;
 192                                                                         //$info['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8;
 193
 194                                                                         $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2)) >> 7;
 195                                                                         $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) >> 7;
 196                                                                         $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFF;
 197                                                                         $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFF;
 198                                                                         break;
 199
 200                                                                 case 1:
 201                                                                         $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3)) >> 7;
 202                                                                         $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) >> 7;
 203                                                                         $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFFFF;
 204                                                                         $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFFFF;
 205                                                                         break;
 206
 207                                                                 case 2:
 208                                                                         $info['video']['resolution_x'] = 352;
 209                                                                         $info['video']['resolution_y'] = 288;
 210                                                                         break;
 211
 212                                                                 case 3:
 213                                                                         $info['video']['resolution_x'] = 176;
 214                                                                         $info['video']['resolution_y'] = 144;
 215                                                                         break;
 216
 217                                                                 case 4:
 218                                                                         $info['video']['resolution_x'] = 128;
 219                                                                         $info['video']['resolution_y'] = 96;
 220                                                                         break;
 221
 222                                                                 case 5:
 223                                                                         $info['video']['resolution_x'] = 320;
 224                                                                         $info['video']['resolution_y'] = 240;
 225                                                                         break;
 226
 227                                                                 case 6:
 228                                                                         $info['video']['resolution_x'] = 160;
 229                                                                         $info['video']['resolution_y'] = 120;
 230                                                                         break;
 231
 232                                                                 default:
 233                                                                         $info['video']['resolution_x'] = 0;
 234                                                                         $info['video']['resolution_y'] = 0;
 235                                                                         break;
 236
 237                                                         }
 238
 239                                                 } elseif ($info['flv']['video']['videoCodec'] ==  GETID3_FLV_VIDEO_VP6FLV_ALPHA) {
 240
 241                                                         /* contributed by schouwerwouØgmail*com */
 242                                                         if (!isset($info['video']['resolution_x'])) { // only when meta data isn't set
 243                                                                 $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
 244                                                                 $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2));
 245                                                                 $info['video']['resolution_x'] = ($PictureSizeEnc['x'] & 0xFF) << 3;
 246                                                                 $info['video']['resolution_y'] = ($PictureSizeEnc['y'] & 0xFF) << 3;
 247                                                         }
 248                                                         /* end schouwerwouØgmail*com */
 249
 250                                                 }
 251                                                 if (!empty($info['video']['resolution_x']) && !empty($info['video']['resolution_y'])) {
 252                                                         $info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y'];
 253                                                 }
 254                                         }
 255                                         break;
 256
 257                                 // Meta tag
 258                                 case GETID3_FLV_TAG_META:
 259                                         if (!$found_meta) {
 260                                                 $found_meta = true;
 261                                                 $this->fseek(-1, SEEK_CUR);
 262                                                 $datachunk = $this->fread($DataLength);
 263                                                 $AMFstream = new AMFStream($datachunk);
 264                                                 $reader = new AMFReader($AMFstream);
 265                                                 $eventName = $reader->readData();
 266                                                 $info['flv']['meta'][$eventName] = $reader->readData();
 267                                                 unset($reader);
 268
 269                                                 $copykeys = array('framerate'=>'frame_rate', 'width'=>'resolution_x', 'height'=>'resolution_y', 'audiodatarate'=>'bitrate', 'videodatarate'=>'bitrate');
 270                                                 foreach ($copykeys as $sourcekey => $destkey) {
 271                                                         if (isset($info['flv']['meta']['onMetaData'][$sourcekey])) {
 272                                                                 switch ($sourcekey) {
 273                                                                         case 'width':
 274                                                                         case 'height':
 275                                                                                 $info['video'][$destkey] = intval(round($info['flv']['meta']['onMetaData'][$sourcekey]));
 276                                                                                 break;
 277                                                                         case 'audiodatarate':
 278                                                                                 $info['audio'][$destkey] = getid3_lib::CastAsInt(round($info['flv']['meta']['onMetaData'][$sourcekey] * 1000));
 279                                                                                 break;
 280                                                                         case 'videodatarate':
 281                                                                         case 'frame_rate':
 282                                                                         default:
 283                                                                                 $info['video'][$destkey] = $info['flv']['meta']['onMetaData'][$sourcekey];
 284                                                                                 break;
 285                                                                 }
 286                                                         }
 287                                                 }
 288                                                 if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
 289                                                         $found_valid_meta_playtime = true;
 290                                                 }
 291                                         }
 292                                         break;
 293
 294                                 default:
 295                                         // noop
 296                                         break;
 297                         }
 298                         $this->fseek($NextOffset);
 299                 }
 300
 301                 $info['playtime_seconds'] = $Duration / 1000;
 302                 if ($info['playtime_seconds'] > 0) {
 303                         $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 304                 }
 305
 306                 if ($info['flv']['header']['hasAudio']) {
 307                         $info['audio']['codec']           =   self::audioFormatLookup($info['flv']['audio']['audioFormat']);
 308                         $info['audio']['sample_rate']     =     self::audioRateLookup($info['flv']['audio']['audioRate']);
 309                         $info['audio']['bits_per_sample'] = self::audioBitDepthLookup($info['flv']['audio']['audioSampleSize']);
 310
 311                         $info['audio']['channels']   =  $info['flv']['audio']['audioType'] + 1; // 0=mono,1=stereo
 312                         $info['audio']['lossless']   = ($info['flv']['audio']['audioFormat'] ? false : true); // 0=uncompressed
 313                         $info['audio']['dataformat'] = 'flv';
 314                 }
 315                 if (!empty($info['flv']['header']['hasVideo'])) {
 316                         $info['video']['codec']      = self::videoCodecLookup($info['flv']['video']['videoCodec']);
 317                         $info['video']['dataformat'] = 'flv';
 318                         $info['video']['lossless']   = false;
 319                 }
 320
 321                 // Set information from meta
 322                 if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
 323                         $info['playtime_seconds'] = $info['flv']['meta']['onMetaData']['duration'];
 324                         $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
 325                 }
 326                 if (isset($info['flv']['meta']['onMetaData']['audiocodecid'])) {
 327                         $info['audio']['codec'] = self::audioFormatLookup($info['flv']['meta']['onMetaData']['audiocodecid']);
 328                 }
 329                 if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
 330                         $info['video']['codec'] = self::videoCodecLookup($info['flv']['meta']['onMetaData']['videocodecid']);
 331                 }
 332                 return true;
 333         }
 334
 335
 336         public static function audioFormatLookup($id) {
 337                 static $lookup = array(
 338                         0  => 'Linear PCM, platform endian',
 339                         1  => 'ADPCM',
 340                         2  => 'mp3',
 341                         3  => 'Linear PCM, little endian',
 342                         4  => 'Nellymoser 16kHz mono',
 343                         5  => 'Nellymoser 8kHz mono',
 344                         6  => 'Nellymoser',
 345                         7  => 'G.711A-law logarithmic PCM',
 346                         8  => 'G.711 mu-law logarithmic PCM',
 347                         9  => 'reserved',
 348                         10 => 'AAC',
 349                         11 => 'Speex',
 350                         12 => false, // unknown?
 351                         13 => false, // unknown?
 352                         14 => 'mp3 8kHz',
 353                         15 => 'Device-specific sound',
 354                 );
 355                 return (isset($lookup[$id]) ? $lookup[$id] : false);
 356         }
 357
 358         public static function audioRateLookup($id) {
 359                 static $lookup = array(
 360                         0 =>  5500,
 361                         1 => 11025,
 362                         2 => 22050,
 363                         3 => 44100,
 364                 );
 365                 return (isset($lookup[$id]) ? $lookup[$id] : false);
 366         }
 367
 368         public static function audioBitDepthLookup($id) {
 369                 static $lookup = array(
 370                         0 =>  8,
 371                         1 => 16,
 372                 );
 373                 return (isset($lookup[$id]) ? $lookup[$id] : false);
 374         }
 375
 376         public static function videoCodecLookup($id) {
 377                 static $lookup = array(
 378                         GETID3_FLV_VIDEO_H263         => 'Sorenson H.263',
 379                         GETID3_FLV_VIDEO_SCREEN       => 'Screen video',
 380                         GETID3_FLV_VIDEO_VP6FLV       => 'On2 VP6',
 381                         GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel',
 382                         GETID3_FLV_VIDEO_SCREENV2     => 'Screen video v2',
 383                         GETID3_FLV_VIDEO_H264         => 'Sorenson H.264',
 384                 );
 385                 return (isset($lookup[$id]) ? $lookup[$id] : false);
 386         }
 387 }
 388
 389 class AMFStream {
 390         public $bytes;
 391         public $pos;
 392
 393         public function __construct(&$bytes) {
 394                 $this->bytes =& $bytes;
 395                 $this->pos = 0;
 396         }
 397
 398         public function readByte() {
 399                 return getid3_lib::BigEndian2Int(substr($this->bytes, $this->pos++, 1));
 400         }
 401
 402         public function readInt() {
 403                 return ($this->readByte() << 8) + $this->readByte();
 404         }
 405
 406         public function readLong() {
 407                 return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
 408         }
 409
 410         public function readDouble() {
 411                 return getid3_lib::BigEndian2Float($this->read(8));
 412         }
 413
 414         public function readUTF() {
 415                 $length = $this->readInt();
 416                 return $this->read($length);
 417         }
 418
 419         public function readLongUTF() {
 420                 $length = $this->readLong();
 421                 return $this->read($length);
 422         }
 423
 424         public function read($length) {
 425                 $val = substr($this->bytes, $this->pos, $length);
 426                 $this->pos += $length;
 427                 return $val;
 428         }
 429
 430         public function peekByte() {
 431                 $pos = $this->pos;
 432                 $val = $this->readByte();
 433                 $this->pos = $pos;
 434                 return $val;
 435         }
 436
 437         public function peekInt() {
 438                 $pos = $this->pos;
 439                 $val = $this->readInt();
 440                 $this->pos = $pos;
 441                 return $val;
 442         }
 443
 444         public function peekLong() {
 445                 $pos = $this->pos;
 446                 $val = $this->readLong();
 447                 $this->pos = $pos;
 448                 return $val;
 449         }
 450
 451         public function peekDouble() {
 452                 $pos = $this->pos;
 453                 $val = $this->readDouble();
 454                 $this->pos = $pos;
 455                 return $val;
 456         }
 457
 458         public function peekUTF() {
 459                 $pos = $this->pos;
 460                 $val = $this->readUTF();
 461                 $this->pos = $pos;
 462                 return $val;
 463         }
 464
 465         public function peekLongUTF() {
 466                 $pos = $this->pos;
 467                 $val = $this->readLongUTF();
 468                 $this->pos = $pos;
 469                 return $val;
 470         }
 471 }
 472
 473 class AMFReader {
 474         public $stream;
 475
 476         public function __construct(&$stream) {
 477                 $this->stream =& $stream;
 478         }
 479
 480         public function readData() {
 481                 $value = null;
 482
 483                 $type = $this->stream->readByte();
 484                 switch ($type) {
 485
 486                         // Double
 487                         case 0:
 488                                 $value = $this->readDouble();
 489                         break;
 490
 491                         // Boolean
 492                         case 1:
 493                                 $value = $this->readBoolean();
 494                                 break;
 495
 496                         // String
 497                         case 2:
 498                                 $value = $this->readString();
 499                                 break;
 500
 501                         // Object
 502                         case 3:
 503                                 $value = $this->readObject();
 504                                 break;
 505
 506                         // null
 507                         case 6:
 508                                 return null;
 509                                 break;
 510
 511                         // Mixed array
 512                         case 8:
 513                                 $value = $this->readMixedArray();
 514                                 break;
 515
 516                         // Array
 517                         case 10:
 518                                 $value = $this->readArray();
 519                                 break;
 520
 521                         // Date
 522                         case 11:
 523                                 $value = $this->readDate();
 524                                 break;
 525
 526                         // Long string
 527                         case 13:
 528                                 $value = $this->readLongString();
 529                                 break;
 530
 531                         // XML (handled as string)
 532                         case 15:
 533                                 $value = $this->readXML();
 534                                 break;
 535
 536                         // Typed object (handled as object)
 537                         case 16:
 538                                 $value = $this->readTypedObject();
 539                                 break;
 540
 541                         // Long string
 542                         default:
 543                                 $value = '(unknown or unsupported data type)';
 544                         break;
 545                 }
 546
 547                 return $value;
 548         }
 549
 550         public function readDouble() {
 551                 return $this->stream->readDouble();
 552         }
 553
 554         public function readBoolean() {
 555                 return $this->stream->readByte() == 1;
 556         }
 557
 558         public function readString() {
 559                 return $this->stream->readUTF();
 560         }
 561
 562         public function readObject() {
 563                 // Get highest numerical index - ignored
 564 //              $highestIndex = $this->stream->readLong();
 565
 566                 $data = array();
 567
 568                 while ($key = $this->stream->readUTF()) {
 569                         $data[$key] = $this->readData();
 570                 }
 571                 // Mixed array record ends with empty string (0x00 0x00) and 0x09
 572                 if (($key == '') && ($this->stream->peekByte() == 0x09)) {
 573                         // Consume byte
 574                         $this->stream->readByte();
 575                 }
 576                 return $data;
 577         }
 578
 579         public function readMixedArray() {
 580                 // Get highest numerical index - ignored
 581                 $highestIndex = $this->stream->readLong();
 582
 583                 $data = array();
 584
 585                 while ($key = $this->stream->readUTF()) {
 586                         if (is_numeric($key)) {
 587                                 $key = (float) $key;
 588                         }
 589                         $data[$key] = $this->readData();
 590                 }
 591                 // Mixed array record ends with empty string (0x00 0x00) and 0x09
 592                 if (($key == '') && ($this->stream->peekByte() == 0x09)) {
 593                         // Consume byte
 594                         $this->stream->readByte();
 595                 }
 596
 597                 return $data;
 598         }
 599
 600         public function readArray() {
 601                 $length = $this->stream->readLong();
 602                 $data = array();
 603
 604                 for ($i = 0; $i < $length; $i++) {
 605                         $data[] = $this->readData();
 606                 }
 607                 return $data;
 608         }
 609
 610         public function readDate() {
 611                 $timestamp = $this->stream->readDouble();
 612                 $timezone = $this->stream->readInt();
 613                 return $timestamp;
 614         }
 615
 616         public function readLongString() {
 617                 return $this->stream->readLongUTF();
 618         }
 619
 620         public function readXML() {
 621                 return $this->stream->readLongUTF();
 622         }
 623
 624         public function readTypedObject() {
 625                 $className = $this->stream->readUTF();
 626                 return $this->readObject();
 627         }
 628 }
 629
 630 class AVCSequenceParameterSetReader {
 631         public $sps;
 632         public $start = 0;
 633         public $currentBytes = 0;
 634         public $currentBits = 0;
 635         public $width;
 636         public $height;
 637
 638         public function __construct($sps) {
 639                 $this->sps = $sps;
 640         }
 641
 642         public function readData() {
 643                 $this->skipBits(8);
 644                 $this->skipBits(8);
 645                 $profile = $this->getBits(8);                               // read profile
 646                 if ($profile > 0) {
 647                         $this->skipBits(8);
 648                         $level_idc = $this->getBits(8);                         // level_idc
 649                         $this->expGolombUe();                                   // seq_parameter_set_id // sps
 650                         $this->expGolombUe();                                   // log2_max_frame_num_minus4
 651                         $picOrderType = $this->expGolombUe();                   // pic_order_cnt_type
 652                         if ($picOrderType == 0) {
 653                                 $this->expGolombUe();                               // log2_max_pic_order_cnt_lsb_minus4
 654                         } elseif ($picOrderType == 1) {
 655                                 $this->skipBits(1);                                 // delta_pic_order_always_zero_flag
 656                                 $this->expGolombSe();                               // offset_for_non_ref_pic
 657                                 $this->expGolombSe();                               // offset_for_top_to_bottom_field
 658                                 $num_ref_frames_in_pic_order_cnt_cycle = $this->expGolombUe(); // num_ref_frames_in_pic_order_cnt_cycle
 659                                 for ($i = 0; $i < $num_ref_frames_in_pic_order_cnt_cycle; $i++) {
 660                                         $this->expGolombSe();                           // offset_for_ref_frame[ i ]
 661                                 }
 662                         }
 663                         $this->expGolombUe();                                   // num_ref_frames
 664                         $this->skipBits(1);                                     // gaps_in_frame_num_value_allowed_flag
 665                         $pic_width_in_mbs_minus1 = $this->expGolombUe();        // pic_width_in_mbs_minus1
 666                         $pic_height_in_map_units_minus1 = $this->expGolombUe(); // pic_height_in_map_units_minus1
 667
 668                         $frame_mbs_only_flag = $this->getBits(1);               // frame_mbs_only_flag
 669                         if ($frame_mbs_only_flag == 0) {
 670                                 $this->skipBits(1);                                 // mb_adaptive_frame_field_flag
 671                         }
 672                         $this->skipBits(1);                                     // direct_8x8_inference_flag
 673                         $frame_cropping_flag = $this->getBits(1);               // frame_cropping_flag
 674
 675                         $frame_crop_left_offset   = 0;
 676                         $frame_crop_right_offset  = 0;
 677                         $frame_crop_top_offset    = 0;
 678                         $frame_crop_bottom_offset = 0;
 679
 680                         if ($frame_cropping_flag) {
 681                                 $frame_crop_left_offset   = $this->expGolombUe();   // frame_crop_left_offset
 682                                 $frame_crop_right_offset  = $this->expGolombUe();   // frame_crop_right_offset
 683                                 $frame_crop_top_offset    = $this->expGolombUe();   // frame_crop_top_offset
 684                                 $frame_crop_bottom_offset = $this->expGolombUe();   // frame_crop_bottom_offset
 685                         }
 686                         $this->skipBits(1);                                     // vui_parameters_present_flag
 687                         // etc
 688
 689                         $this->width  = (($pic_width_in_mbs_minus1 + 1) * 16) - ($frame_crop_left_offset * 2) - ($frame_crop_right_offset * 2);
 690                         $this->height = ((2 - $frame_mbs_only_flag) * ($pic_height_in_map_units_minus1 + 1) * 16) - ($frame_crop_top_offset * 2) - ($frame_crop_bottom_offset * 2);
 691                 }
 692         }
 693
 694         public function skipBits($bits) {
 695                 $newBits = $this->currentBits + $bits;
 696                 $this->currentBytes += (int)floor($newBits / 8);
 697                 $this->currentBits = $newBits % 8;
 698         }
 699
 700         public function getBit() {
 701                 $result = (getid3_lib::BigEndian2Int(substr($this->sps, $this->currentBytes, 1)) >> (7 - $this->currentBits)) & 0x01;
 702                 $this->skipBits(1);
 703                 return $result;
 704         }
 705
 706         public function getBits($bits) {
 707                 $result = 0;
 708                 for ($i = 0; $i < $bits; $i++) {
 709                         $result = ($result << 1) + $this->getBit();
 710                 }
 711                 return $result;
 712         }
 713
 714         public function expGolombUe() {
 715                 $significantBits = 0;
 716                 $bit = $this->getBit();
 717                 while ($bit == 0) {
 718                         $significantBits++;
 719                         $bit = $this->getBit();
 720
 721                         if ($significantBits > 31) {
 722                                 // something is broken, this is an emergency escape to prevent infinite loops
 723                                 return 0;
 724                         }
 725                 }
 726                 return (1 << $significantBits) + $this->getBits($significantBits) - 1;
 727         }
 728
 729         public function expGolombSe() {
 730                 $result = $this->expGolombUe();
 731                 if (($result & 0x01) == 0) {
 732                         return -($result >> 1);
 733                 } else {
 734                         return ($result + 1) >> 1;
 735                 }
 736         }
 737
 738         public function getWidth() {
 739                 return $this->width;
 740         }
 741
 742         public function getHeight() {
 743                 return $this->height;
 744         }
 745 }