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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 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 $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::magic).'" at offset '.$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 }
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