Wordpress 3.6
[autoinstalls/wordpress.git] / 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 }