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[lhc/web/www.git] / www / plugins-dist / medias / lib / getid3 / module.audio-video.flv.php
1 <?php
2 /////////////////////////////////////////////////////////////////
3 /// getID3() by James Heinrich <info@getid3.org> //
4 // available at https://github.com/JamesHeinrich/getID3 //
5 // or https://www.getid3.org //
6 // or http://getid3.sourceforge.net //
7 // see readme.txt for more details //
8 /////////////////////////////////////////////////////////////////
9 // //
10 // module.audio-video.flv.php //
11 // module for analyzing Shockwave Flash Video files //
12 // dependencies: NONE //
13 // //
14 /////////////////////////////////////////////////////////////////
15 // //
16 // FLV module by Seth Kaufman <sethØwhirl-i-gig*com> //
17 // //
18 // * version 0.1 (26 June 2005) //
19 // //
20 // * version 0.1.1 (15 July 2005) //
21 // minor modifications by James Heinrich <info@getid3.org> //
22 // //
23 // * version 0.2 (22 February 2006) //
24 // Support for On2 VP6 codec and meta information //
25 // by Steve Webster <steve.websterØfeaturecreep*com> //
26 // //
27 // * version 0.3 (15 June 2006) //
28 // Modified to not read entire file into memory //
29 // by James Heinrich <info@getid3.org> //
30 // //
31 // * version 0.4 (07 December 2007) //
32 // Bugfixes for incorrectly parsed FLV dimensions //
33 // and incorrect parsing of onMetaTag //
34 // by Evgeny Moysevich <moysevichØgmail*com> //
35 // //
36 // * version 0.5 (21 May 2009) //
37 // Fixed parsing of audio tags and added additional codec //
38 // details. The duration is now read from onMetaTag (if //
39 // exists), rather than parsing whole file //
40 // by Nigel Barnes <ngbarnesØhotmail*com> //
41 // //
42 // * version 0.6 (24 May 2009) //
43 // Better parsing of files with h264 video //
44 // by Evgeny Moysevich <moysevichØgmail*com> //
45 // //
46 // * version 0.6.1 (30 May 2011) //
47 // prevent infinite loops in expGolombUe() //
48 // //
49 // * version 0.7.0 (16 Jul 2013) //
50 // handle GETID3_FLV_VIDEO_VP6FLV_ALPHA //
51 // improved AVCSequenceParameterSetReader::readData() //
52 // by Xander Schouwerwou <schouwerwouØgmail*com> //
53 // ///
54 /////////////////////////////////////////////////////////////////
55
56 define('GETID3_FLV_TAG_AUDIO', 8);
57 define('GETID3_FLV_TAG_VIDEO', 9);
58 define('GETID3_FLV_TAG_META', 18);
59
60 define('GETID3_FLV_VIDEO_H263', 2);
61 define('GETID3_FLV_VIDEO_SCREEN', 3);
62 define('GETID3_FLV_VIDEO_VP6FLV', 4);
63 define('GETID3_FLV_VIDEO_VP6FLV_ALPHA', 5);
64 define('GETID3_FLV_VIDEO_SCREENV2', 6);
65 define('GETID3_FLV_VIDEO_H264', 7);
66
67 define('H264_AVC_SEQUENCE_HEADER', 0);
68 define('H264_PROFILE_BASELINE', 66);
69 define('H264_PROFILE_MAIN', 77);
70 define('H264_PROFILE_EXTENDED', 88);
71 define('H264_PROFILE_HIGH', 100);
72 define('H264_PROFILE_HIGH10', 110);
73 define('H264_PROFILE_HIGH422', 122);
74 define('H264_PROFILE_HIGH444', 144);
75 define('H264_PROFILE_HIGH444_PREDICTIVE', 244);
76
77 class getid3_flv extends getid3_handler
78 {
79 const magic = 'FLV';
80
81 /**
82 * Break out of the loop if too many frames have been scanned; only scan this
83 * many if meta frame does not contain useful duration.
84 *
85 * @var int
86 */
87 public $max_frames = 100000;
88
89 /**
90 * @return bool
91 */
92 public function Analyze() {
93 $info = &$this->getid3->info;
94
95 $this->fseek($info['avdataoffset']);
96
97 $FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
98 $FLVheader = $this->fread(5);
99
100 $info['fileformat'] = 'flv';
101 $info['flv']['header']['signature'] = substr($FLVheader, 0, 3);
102 $info['flv']['header']['version'] = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
103 $TypeFlags = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));
104
105 if ($info['flv']['header']['signature'] != self::magic) {
106 $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['flv']['header']['signature']).'"');
107 unset($info['flv'], $info['fileformat']);
108 return false;
109 }
110
111 $info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x04);
112 $info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x01);
113
114 $FrameSizeDataLength = getid3_lib::BigEndian2Int($this->fread(4));
115 $FLVheaderFrameLength = 9;
116 if ($FrameSizeDataLength > $FLVheaderFrameLength) {
117 $this->fseek($FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
118 }
119 $Duration = 0;
120 $found_video = false;
121 $found_audio = false;
122 $found_meta = false;
123 $found_valid_meta_playtime = false;
124 $tagParseCount = 0;
125 $info['flv']['framecount'] = array('total'=>0, 'audio'=>0, 'video'=>0);
126 $flv_framecount = &$info['flv']['framecount'];
127 while ((($this->ftell() + 16) < $info['avdataend']) && (($tagParseCount++ <= $this->max_frames) || !$found_valid_meta_playtime)) {
128 $ThisTagHeader = $this->fread(16);
129
130 $PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 0, 4));
131 $TagType = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 4, 1));
132 $DataLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 5, 3));
133 $Timestamp = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 8, 3));
134 $LastHeaderByte = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
135 $NextOffset = $this->ftell() - 1 + $DataLength;
136 if ($Timestamp > $Duration) {
137 $Duration = $Timestamp;
138 }
139
140 $flv_framecount['total']++;
141 switch ($TagType) {
142 case GETID3_FLV_TAG_AUDIO:
143 $flv_framecount['audio']++;
144 if (!$found_audio) {
145 $found_audio = true;
146 $info['flv']['audio']['audioFormat'] = ($LastHeaderByte >> 4) & 0x0F;
147 $info['flv']['audio']['audioRate'] = ($LastHeaderByte >> 2) & 0x03;
148 $info['flv']['audio']['audioSampleSize'] = ($LastHeaderByte >> 1) & 0x01;
149 $info['flv']['audio']['audioType'] = $LastHeaderByte & 0x01;
150 }
151 break;
152
153 case GETID3_FLV_TAG_VIDEO:
154 $flv_framecount['video']++;
155 if (!$found_video) {
156 $found_video = true;
157 $info['flv']['video']['videoCodec'] = $LastHeaderByte & 0x07;
158
159 $FLVvideoHeader = $this->fread(11);
160
161 if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
162 // this code block contributed by: moysevichØgmail*com
163
164 $AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
165 if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
166 // read AVCDecoderConfigurationRecord
167 $configurationVersion = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 1));
168 $AVCProfileIndication = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 1));
169 $profile_compatibility = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 1));
170 $lengthSizeMinusOne = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 1));
171 $numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 8, 1));
172
173 if (($numOfSequenceParameterSets & 0x1F) != 0) {
174 // there is at least one SequenceParameterSet
175 // read size of the first SequenceParameterSet
176 //$spsSize = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 9, 2));
177 $spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
178 // read the first SequenceParameterSet
179 $sps = $this->fread($spsSize);
180 if (strlen($sps) == $spsSize) { // make sure that whole SequenceParameterSet was red
181 $spsReader = new AVCSequenceParameterSetReader($sps);
182 $spsReader->readData();
183 $info['video']['resolution_x'] = $spsReader->getWidth();
184 $info['video']['resolution_y'] = $spsReader->getHeight();
185 }
186 }
187 }
188 // end: moysevichØgmail*com
189
190 } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H263) {
191
192 $PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2))) >> 7;
193 $PictureSizeType = $PictureSizeType & 0x0007;
194 $info['flv']['header']['videoSizeType'] = $PictureSizeType;
195 switch ($PictureSizeType) {
196 case 0:
197 //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
198 //$PictureSizeEnc <<= 1;
199 //$info['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8;
200 //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
201 //$PictureSizeEnc <<= 1;
202 //$info['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8;
203
204 $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2)) >> 7;
205 $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) >> 7;
206 $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFF;
207 $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFF;
208 break;
209
210 case 1:
211 $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3)) >> 7;
212 $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) >> 7;
213 $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFFFF;
214 $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFFFF;
215 break;
216
217 case 2:
218 $info['video']['resolution_x'] = 352;
219 $info['video']['resolution_y'] = 288;
220 break;
221
222 case 3:
223 $info['video']['resolution_x'] = 176;
224 $info['video']['resolution_y'] = 144;
225 break;
226
227 case 4:
228 $info['video']['resolution_x'] = 128;
229 $info['video']['resolution_y'] = 96;
230 break;
231
232 case 5:
233 $info['video']['resolution_x'] = 320;
234 $info['video']['resolution_y'] = 240;
235 break;
236
237 case 6:
238 $info['video']['resolution_x'] = 160;
239 $info['video']['resolution_y'] = 120;
240 break;
241
242 default:
243 $info['video']['resolution_x'] = 0;
244 $info['video']['resolution_y'] = 0;
245 break;
246
247 }
248
249 } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_VP6FLV_ALPHA) {
250
251 /* contributed by schouwerwouØgmail*com */
252 if (!isset($info['video']['resolution_x'])) { // only when meta data isn't set
253 $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
254 $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2));
255 $info['video']['resolution_x'] = ($PictureSizeEnc['x'] & 0xFF) << 3;
256 $info['video']['resolution_y'] = ($PictureSizeEnc['y'] & 0xFF) << 3;
257 }
258 /* end schouwerwouØgmail*com */
259
260 }
261 if (!empty($info['video']['resolution_x']) && !empty($info['video']['resolution_y'])) {
262 $info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y'];
263 }
264 }
265 break;
266
267 // Meta tag
268 case GETID3_FLV_TAG_META:
269 if (!$found_meta) {
270 $found_meta = true;
271 $this->fseek(-1, SEEK_CUR);
272 $datachunk = $this->fread($DataLength);
273 $AMFstream = new AMFStream($datachunk);
274 $reader = new AMFReader($AMFstream);
275 $eventName = $reader->readData();
276 $info['flv']['meta'][$eventName] = $reader->readData();
277 unset($reader);
278
279 $copykeys = array('framerate'=>'frame_rate', 'width'=>'resolution_x', 'height'=>'resolution_y', 'audiodatarate'=>'bitrate', 'videodatarate'=>'bitrate');
280 foreach ($copykeys as $sourcekey => $destkey) {
281 if (isset($info['flv']['meta']['onMetaData'][$sourcekey])) {
282 switch ($sourcekey) {
283 case 'width':
284 case 'height':
285 $info['video'][$destkey] = intval(round($info['flv']['meta']['onMetaData'][$sourcekey]));
286 break;
287 case 'audiodatarate':
288 $info['audio'][$destkey] = getid3_lib::CastAsInt(round($info['flv']['meta']['onMetaData'][$sourcekey] * 1000));
289 break;
290 case 'videodatarate':
291 case 'frame_rate':
292 default:
293 $info['video'][$destkey] = $info['flv']['meta']['onMetaData'][$sourcekey];
294 break;
295 }
296 }
297 }
298 if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
299 $found_valid_meta_playtime = true;
300 }
301 }
302 break;
303
304 default:
305 // noop
306 break;
307 }
308 $this->fseek($NextOffset);
309 }
310
311 $info['playtime_seconds'] = $Duration / 1000;
312 if ($info['playtime_seconds'] > 0) {
313 $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
314 }
315
316 if ($info['flv']['header']['hasAudio']) {
317 $info['audio']['codec'] = self::audioFormatLookup($info['flv']['audio']['audioFormat']);
318 $info['audio']['sample_rate'] = self::audioRateLookup($info['flv']['audio']['audioRate']);
319 $info['audio']['bits_per_sample'] = self::audioBitDepthLookup($info['flv']['audio']['audioSampleSize']);
320
321 $info['audio']['channels'] = $info['flv']['audio']['audioType'] + 1; // 0=mono,1=stereo
322 $info['audio']['lossless'] = ($info['flv']['audio']['audioFormat'] ? false : true); // 0=uncompressed
323 $info['audio']['dataformat'] = 'flv';
324 }
325 if (!empty($info['flv']['header']['hasVideo'])) {
326 $info['video']['codec'] = self::videoCodecLookup($info['flv']['video']['videoCodec']);
327 $info['video']['dataformat'] = 'flv';
328 $info['video']['lossless'] = false;
329 }
330
331 // Set information from meta
332 if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
333 $info['playtime_seconds'] = $info['flv']['meta']['onMetaData']['duration'];
334 $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
335 }
336 if (isset($info['flv']['meta']['onMetaData']['audiocodecid'])) {
337 $info['audio']['codec'] = self::audioFormatLookup($info['flv']['meta']['onMetaData']['audiocodecid']);
338 }
339 if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
340 $info['video']['codec'] = self::videoCodecLookup($info['flv']['meta']['onMetaData']['videocodecid']);
341 }
342 return true;
343 }
344
345 /**
346 * @param int $id
347 *
348 * @return string|false
349 */
350 public static function audioFormatLookup($id) {
351 static $lookup = array(
352 0 => 'Linear PCM, platform endian',
353 1 => 'ADPCM',
354 2 => 'mp3',
355 3 => 'Linear PCM, little endian',
356 4 => 'Nellymoser 16kHz mono',
357 5 => 'Nellymoser 8kHz mono',
358 6 => 'Nellymoser',
359 7 => 'G.711A-law logarithmic PCM',
360 8 => 'G.711 mu-law logarithmic PCM',
361 9 => 'reserved',
362 10 => 'AAC',
363 11 => 'Speex',
364 12 => false, // unknown?
365 13 => false, // unknown?
366 14 => 'mp3 8kHz',
367 15 => 'Device-specific sound',
368 );
369 return (isset($lookup[$id]) ? $lookup[$id] : false);
370 }
371
372 /**
373 * @param int $id
374 *
375 * @return int|false
376 */
377 public static function audioRateLookup($id) {
378 static $lookup = array(
379 0 => 5500,
380 1 => 11025,
381 2 => 22050,
382 3 => 44100,
383 );
384 return (isset($lookup[$id]) ? $lookup[$id] : false);
385 }
386
387 /**
388 * @param int $id
389 *
390 * @return int|false
391 */
392 public static function audioBitDepthLookup($id) {
393 static $lookup = array(
394 0 => 8,
395 1 => 16,
396 );
397 return (isset($lookup[$id]) ? $lookup[$id] : false);
398 }
399
400 /**
401 * @param int $id
402 *
403 * @return string|false
404 */
405 public static function videoCodecLookup($id) {
406 static $lookup = array(
407 GETID3_FLV_VIDEO_H263 => 'Sorenson H.263',
408 GETID3_FLV_VIDEO_SCREEN => 'Screen video',
409 GETID3_FLV_VIDEO_VP6FLV => 'On2 VP6',
410 GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel',
411 GETID3_FLV_VIDEO_SCREENV2 => 'Screen video v2',
412 GETID3_FLV_VIDEO_H264 => 'Sorenson H.264',
413 );
414 return (isset($lookup[$id]) ? $lookup[$id] : false);
415 }
416 }
417
418 class AMFStream
419 {
420 /**
421 * @var string
422 */
423 public $bytes;
424
425 /**
426 * @var int
427 */
428 public $pos;
429
430 /**
431 * @param string $bytes
432 */
433 public function __construct(&$bytes) {
434 $this->bytes =& $bytes;
435 $this->pos = 0;
436 }
437
438 /**
439 * @return int
440 */
441 public function readByte() { // 8-bit
442 return ord(substr($this->bytes, $this->pos++, 1));
443 }
444
445 /**
446 * @return int
447 */
448 public function readInt() { // 16-bit
449 return ($this->readByte() << 8) + $this->readByte();
450 }
451
452 /**
453 * @return int
454 */
455 public function readLong() { // 32-bit
456 return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
457 }
458
459 /**
460 * @return float|false
461 */
462 public function readDouble() {
463 return getid3_lib::BigEndian2Float($this->read(8));
464 }
465
466 /**
467 * @return string
468 */
469 public function readUTF() {
470 $length = $this->readInt();
471 return $this->read($length);
472 }
473
474 /**
475 * @return string
476 */
477 public function readLongUTF() {
478 $length = $this->readLong();
479 return $this->read($length);
480 }
481
482 /**
483 * @param int $length
484 *
485 * @return string
486 */
487 public function read($length) {
488 $val = substr($this->bytes, $this->pos, $length);
489 $this->pos += $length;
490 return $val;
491 }
492
493 /**
494 * @return int
495 */
496 public function peekByte() {
497 $pos = $this->pos;
498 $val = $this->readByte();
499 $this->pos = $pos;
500 return $val;
501 }
502
503 /**
504 * @return int
505 */
506 public function peekInt() {
507 $pos = $this->pos;
508 $val = $this->readInt();
509 $this->pos = $pos;
510 return $val;
511 }
512
513 /**
514 * @return int
515 */
516 public function peekLong() {
517 $pos = $this->pos;
518 $val = $this->readLong();
519 $this->pos = $pos;
520 return $val;
521 }
522
523 /**
524 * @return float|false
525 */
526 public function peekDouble() {
527 $pos = $this->pos;
528 $val = $this->readDouble();
529 $this->pos = $pos;
530 return $val;
531 }
532
533 /**
534 * @return string
535 */
536 public function peekUTF() {
537 $pos = $this->pos;
538 $val = $this->readUTF();
539 $this->pos = $pos;
540 return $val;
541 }
542
543 /**
544 * @return string
545 */
546 public function peekLongUTF() {
547 $pos = $this->pos;
548 $val = $this->readLongUTF();
549 $this->pos = $pos;
550 return $val;
551 }
552 }
553
554 class AMFReader
555 {
556 /**
557 * @var AMFStream
558 */
559 public $stream;
560
561 /**
562 * @param AMFStream $stream
563 */
564 public function __construct(AMFStream $stream) {
565 $this->stream = $stream;
566 }
567
568 /**
569 * @return mixed
570 */
571 public function readData() {
572 $value = null;
573
574 $type = $this->stream->readByte();
575 switch ($type) {
576
577 // Double
578 case 0:
579 $value = $this->readDouble();
580 break;
581
582 // Boolean
583 case 1:
584 $value = $this->readBoolean();
585 break;
586
587 // String
588 case 2:
589 $value = $this->readString();
590 break;
591
592 // Object
593 case 3:
594 $value = $this->readObject();
595 break;
596
597 // null
598 case 6:
599 return null;
600 break;
601
602 // Mixed array
603 case 8:
604 $value = $this->readMixedArray();
605 break;
606
607 // Array
608 case 10:
609 $value = $this->readArray();
610 break;
611
612 // Date
613 case 11:
614 $value = $this->readDate();
615 break;
616
617 // Long string
618 case 13:
619 $value = $this->readLongString();
620 break;
621
622 // XML (handled as string)
623 case 15:
624 $value = $this->readXML();
625 break;
626
627 // Typed object (handled as object)
628 case 16:
629 $value = $this->readTypedObject();
630 break;
631
632 // Long string
633 default:
634 $value = '(unknown or unsupported data type)';
635 break;
636 }
637
638 return $value;
639 }
640
641 /**
642 * @return float|false
643 */
644 public function readDouble() {
645 return $this->stream->readDouble();
646 }
647
648 /**
649 * @return bool
650 */
651 public function readBoolean() {
652 return $this->stream->readByte() == 1;
653 }
654
655 /**
656 * @return string
657 */
658 public function readString() {
659 return $this->stream->readUTF();
660 }
661
662 /**
663 * @return array
664 */
665 public function readObject() {
666 // Get highest numerical index - ignored
667 // $highestIndex = $this->stream->readLong();
668
669 $data = array();
670 $key = null;
671
672 while ($key = $this->stream->readUTF()) {
673 $data[$key] = $this->readData();
674 }
675 // Mixed array record ends with empty string (0x00 0x00) and 0x09
676 if (($key == '') && ($this->stream->peekByte() == 0x09)) {
677 // Consume byte
678 $this->stream->readByte();
679 }
680 return $data;
681 }
682
683 /**
684 * @return array
685 */
686 public function readMixedArray() {
687 // Get highest numerical index - ignored
688 $highestIndex = $this->stream->readLong();
689
690 $data = array();
691 $key = null;
692
693 while ($key = $this->stream->readUTF()) {
694 if (is_numeric($key)) {
695 $key = (int) $key;
696 }
697 $data[$key] = $this->readData();
698 }
699 // Mixed array record ends with empty string (0x00 0x00) and 0x09
700 if (($key == '') && ($this->stream->peekByte() == 0x09)) {
701 // Consume byte
702 $this->stream->readByte();
703 }
704
705 return $data;
706 }
707
708 /**
709 * @return array
710 */
711 public function readArray() {
712 $length = $this->stream->readLong();
713 $data = array();
714
715 for ($i = 0; $i < $length; $i++) {
716 $data[] = $this->readData();
717 }
718 return $data;
719 }
720
721 /**
722 * @return float|false
723 */
724 public function readDate() {
725 $timestamp = $this->stream->readDouble();
726 $timezone = $this->stream->readInt();
727 return $timestamp;
728 }
729
730 /**
731 * @return string
732 */
733 public function readLongString() {
734 return $this->stream->readLongUTF();
735 }
736
737 /**
738 * @return string
739 */
740 public function readXML() {
741 return $this->stream->readLongUTF();
742 }
743
744 /**
745 * @return array
746 */
747 public function readTypedObject() {
748 $className = $this->stream->readUTF();
749 return $this->readObject();
750 }
751 }
752
753 class AVCSequenceParameterSetReader
754 {
755 /**
756 * @var string
757 */
758 public $sps;
759 public $start = 0;
760 public $currentBytes = 0;
761 public $currentBits = 0;
762
763 /**
764 * @var int
765 */
766 public $width;
767
768 /**
769 * @var int
770 */
771 public $height;
772
773 /**
774 * @param string $sps
775 */
776 public function __construct($sps) {
777 $this->sps = $sps;
778 }
779
780 public function readData() {
781 $this->skipBits(8);
782 $this->skipBits(8);
783 $profile = $this->getBits(8); // read profile
784 if ($profile > 0) {
785 $this->skipBits(8);
786 $level_idc = $this->getBits(8); // level_idc
787 $this->expGolombUe(); // seq_parameter_set_id // sps
788 $this->expGolombUe(); // log2_max_frame_num_minus4
789 $picOrderType = $this->expGolombUe(); // pic_order_cnt_type
790 if ($picOrderType == 0) {
791 $this->expGolombUe(); // log2_max_pic_order_cnt_lsb_minus4
792 } elseif ($picOrderType == 1) {
793 $this->skipBits(1); // delta_pic_order_always_zero_flag
794 $this->expGolombSe(); // offset_for_non_ref_pic
795 $this->expGolombSe(); // offset_for_top_to_bottom_field
796 $num_ref_frames_in_pic_order_cnt_cycle = $this->expGolombUe(); // num_ref_frames_in_pic_order_cnt_cycle
797 for ($i = 0; $i < $num_ref_frames_in_pic_order_cnt_cycle; $i++) {
798 $this->expGolombSe(); // offset_for_ref_frame[ i ]
799 }
800 }
801 $this->expGolombUe(); // num_ref_frames
802 $this->skipBits(1); // gaps_in_frame_num_value_allowed_flag
803 $pic_width_in_mbs_minus1 = $this->expGolombUe(); // pic_width_in_mbs_minus1
804 $pic_height_in_map_units_minus1 = $this->expGolombUe(); // pic_height_in_map_units_minus1
805
806 $frame_mbs_only_flag = $this->getBits(1); // frame_mbs_only_flag
807 if ($frame_mbs_only_flag == 0) {
808 $this->skipBits(1); // mb_adaptive_frame_field_flag
809 }
810 $this->skipBits(1); // direct_8x8_inference_flag
811 $frame_cropping_flag = $this->getBits(1); // frame_cropping_flag
812
813 $frame_crop_left_offset = 0;
814 $frame_crop_right_offset = 0;
815 $frame_crop_top_offset = 0;
816 $frame_crop_bottom_offset = 0;
817
818 if ($frame_cropping_flag) {
819 $frame_crop_left_offset = $this->expGolombUe(); // frame_crop_left_offset
820 $frame_crop_right_offset = $this->expGolombUe(); // frame_crop_right_offset
821 $frame_crop_top_offset = $this->expGolombUe(); // frame_crop_top_offset
822 $frame_crop_bottom_offset = $this->expGolombUe(); // frame_crop_bottom_offset
823 }
824 $this->skipBits(1); // vui_parameters_present_flag
825 // etc
826
827 $this->width = (($pic_width_in_mbs_minus1 + 1) * 16) - ($frame_crop_left_offset * 2) - ($frame_crop_right_offset * 2);
828 $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);
829 }
830 }
831
832 /**
833 * @param int $bits
834 */
835 public function skipBits($bits) {
836 $newBits = $this->currentBits + $bits;
837 $this->currentBytes += (int)floor($newBits / 8);
838 $this->currentBits = $newBits % 8;
839 }
840
841 /**
842 * @return int
843 */
844 public function getBit() {
845 $result = (getid3_lib::BigEndian2Int(substr($this->sps, $this->currentBytes, 1)) >> (7 - $this->currentBits)) & 0x01;
846 $this->skipBits(1);
847 return $result;
848 }
849
850 /**
851 * @param int $bits
852 *
853 * @return int
854 */
855 public function getBits($bits) {
856 $result = 0;
857 for ($i = 0; $i < $bits; $i++) {
858 $result = ($result << 1) + $this->getBit();
859 }
860 return $result;
861 }
862
863 /**
864 * @return int
865 */
866 public function expGolombUe() {
867 $significantBits = 0;
868 $bit = $this->getBit();
869 while ($bit == 0) {
870 $significantBits++;
871 $bit = $this->getBit();
872
873 if ($significantBits > 31) {
874 // something is broken, this is an emergency escape to prevent infinite loops
875 return 0;
876 }
877 }
878 return (1 << $significantBits) + $this->getBits($significantBits) - 1;
879 }
880
881 /**
882 * @return int
883 */
884 public function expGolombSe() {
885 $result = $this->expGolombUe();
886 if (($result & 0x01) == 0) {
887 return -($result >> 1);
888 } else {
889 return ($result + 1) >> 1;
890 }
891 }
892
893 /**
894 * @return int
895 */
896 public function getWidth() {
897 return $this->width;
898 }
899
900 /**
901 * @return int
902 */
903 public function getHeight() {
904 return $this->height;
905 }
906 }
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