WordPress 4.3
[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 //          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 }