--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/ID3/module.audio-video.flv.php Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,729 @@
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+// //
+// FLV module by Seth Kaufman <sethØwhirl-i-gig*com> //
+// //
+// * version 0.1 (26 June 2005) //
+// //
+// //
+// * version 0.1.1 (15 July 2005) //
+// minor modifications by James Heinrich <info@getid3.org> //
+// //
+// * version 0.2 (22 February 2006) //
+// Support for On2 VP6 codec and meta information //
+// by Steve Webster <steve.websterØfeaturecreep*com> //
+// //
+// * version 0.3 (15 June 2006) //
+// Modified to not read entire file into memory //
+// by James Heinrich <info@getid3.org> //
+// //
+// * version 0.4 (07 December 2007) //
+// Bugfixes for incorrectly parsed FLV dimensions //
+// and incorrect parsing of onMetaTag //
+// by Evgeny Moysevich <moysevichØgmail*com> //
+// //
+// * version 0.5 (21 May 2009) //
+// Fixed parsing of audio tags and added additional codec //
+// details. The duration is now read from onMetaTag (if //
+// exists), rather than parsing whole file //
+// by Nigel Barnes <ngbarnesØhotmail*com> //
+// //
+// * version 0.6 (24 May 2009) //
+// Better parsing of files with h264 video //
+// by Evgeny Moysevich <moysevichØgmail*com> //
+// //
+// * version 0.6.1 (30 May 2011) //
+// prevent infinite loops in expGolombUe() //
+// //
+/////////////////////////////////////////////////////////////////
+// //
+// module.audio-video.flv.php //
+// module for analyzing Shockwave Flash Video files //
+// dependencies: NONE //
+// ///
+/////////////////////////////////////////////////////////////////
+
+define('GETID3_FLV_TAG_AUDIO', 8);
+define('GETID3_FLV_TAG_VIDEO', 9);
+define('GETID3_FLV_TAG_META', 18);
+
+define('GETID3_FLV_VIDEO_H263', 2);
+define('GETID3_FLV_VIDEO_SCREEN', 3);
+define('GETID3_FLV_VIDEO_VP6FLV', 4);
+define('GETID3_FLV_VIDEO_VP6FLV_ALPHA', 5);
+define('GETID3_FLV_VIDEO_SCREENV2', 6);
+define('GETID3_FLV_VIDEO_H264', 7);
+
+define('H264_AVC_SEQUENCE_HEADER', 0);
+define('H264_PROFILE_BASELINE', 66);
+define('H264_PROFILE_MAIN', 77);
+define('H264_PROFILE_EXTENDED', 88);
+define('H264_PROFILE_HIGH', 100);
+define('H264_PROFILE_HIGH10', 110);
+define('H264_PROFILE_HIGH422', 122);
+define('H264_PROFILE_HIGH444', 144);
+define('H264_PROFILE_HIGH444_PREDICTIVE', 244);
+
+class getid3_flv extends getid3_handler
+{
+ 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
+
+ public function Analyze() {
+ $info = &$this->getid3->info;
+
+ fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
+
+ $FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
+ $FLVheader = fread($this->getid3->fp, 5);
+
+ $info['fileformat'] = 'flv';
+ $info['flv']['header']['signature'] = substr($FLVheader, 0, 3);
+ $info['flv']['header']['version'] = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
+ $TypeFlags = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));
+
+ $magic = 'FLV';
+ if ($info['flv']['header']['signature'] != $magic) {
+ $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['flv']['header']['signature']).'"';
+ unset($info['flv']);
+ unset($info['fileformat']);
+ return false;
+ }
+
+ $info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x04);
+ $info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x01);
+
+ $FrameSizeDataLength = getid3_lib::BigEndian2Int(fread($this->getid3->fp, 4));
+ $FLVheaderFrameLength = 9;
+ if ($FrameSizeDataLength > $FLVheaderFrameLength) {
+ fseek($this->getid3->fp, $FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
+ }
+ $Duration = 0;
+ $found_video = false;
+ $found_audio = false;
+ $found_meta = false;
+ $found_valid_meta_playtime = false;
+ $tagParseCount = 0;
+ $info['flv']['framecount'] = array('total'=>0, 'audio'=>0, 'video'=>0);
+ $flv_framecount = &$info['flv']['framecount'];
+ while (((ftell($this->getid3->fp) + 16) < $info['avdataend']) && (($tagParseCount++ <= $this->max_frames) || !$found_valid_meta_playtime)) {
+ $ThisTagHeader = fread($this->getid3->fp, 16);
+
+ $PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 0, 4));
+ $TagType = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 4, 1));
+ $DataLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 5, 3));
+ $Timestamp = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 8, 3));
+ $LastHeaderByte = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
+ $NextOffset = ftell($this->getid3->fp) - 1 + $DataLength;
+ if ($Timestamp > $Duration) {
+ $Duration = $Timestamp;
+ }
+
+ $flv_framecount['total']++;
+ switch ($TagType) {
+ case GETID3_FLV_TAG_AUDIO:
+ $flv_framecount['audio']++;
+ if (!$found_audio) {
+ $found_audio = true;
+ $info['flv']['audio']['audioFormat'] = ($LastHeaderByte >> 4) & 0x0F;
+ $info['flv']['audio']['audioRate'] = ($LastHeaderByte >> 2) & 0x03;
+ $info['flv']['audio']['audioSampleSize'] = ($LastHeaderByte >> 1) & 0x01;
+ $info['flv']['audio']['audioType'] = $LastHeaderByte & 0x01;
+ }
+ break;
+
+ case GETID3_FLV_TAG_VIDEO:
+ $flv_framecount['video']++;
+ if (!$found_video) {
+ $found_video = true;
+ $info['flv']['video']['videoCodec'] = $LastHeaderByte & 0x07;
+
+ $FLVvideoHeader = fread($this->getid3->fp, 11);
+
+ if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
+ // this code block contributed by: moysevichØgmail*com
+
+ $AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
+ if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
+ // read AVCDecoderConfigurationRecord
+ $configurationVersion = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 1));
+ $AVCProfileIndication = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 1));
+ $profile_compatibility = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 1));
+ $lengthSizeMinusOne = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 1));
+ $numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 8, 1));
+
+ if (($numOfSequenceParameterSets & 0x1F) != 0) {
+ // there is at least one SequenceParameterSet
+ // read size of the first SequenceParameterSet
+ //$spsSize = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 9, 2));
+ $spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
+ // read the first SequenceParameterSet
+ $sps = fread($this->getid3->fp, $spsSize);
+ if (strlen($sps) == $spsSize) { // make sure that whole SequenceParameterSet was red
+ $spsReader = new AVCSequenceParameterSetReader($sps);
+ $spsReader->readData();
+ $info['video']['resolution_x'] = $spsReader->getWidth();
+ $info['video']['resolution_y'] = $spsReader->getHeight();
+ }
+ }
+ }
+ // end: moysevichØgmail*com
+
+ } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H263) {
+
+ $PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2))) >> 7;
+ $PictureSizeType = $PictureSizeType & 0x0007;
+ $info['flv']['header']['videoSizeType'] = $PictureSizeType;
+ switch ($PictureSizeType) {
+ case 0:
+ //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
+ //$PictureSizeEnc <<= 1;
+ //$info['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8;
+ //$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
+ //$PictureSizeEnc <<= 1;
+ //$info['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8;
+
+ $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2));
+ $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
+ $PictureSizeEnc['x'] >>= 7;
+ $PictureSizeEnc['y'] >>= 7;
+ $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFF;
+ $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFF;
+ break;
+
+ case 1:
+ $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3));
+ $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3));
+ $PictureSizeEnc['x'] >>= 7;
+ $PictureSizeEnc['y'] >>= 7;
+ $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFFFF;
+ $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFFFF;
+ break;
+
+ case 2:
+ $info['video']['resolution_x'] = 352;
+ $info['video']['resolution_y'] = 288;
+ break;
+
+ case 3:
+ $info['video']['resolution_x'] = 176;
+ $info['video']['resolution_y'] = 144;
+ break;
+
+ case 4:
+ $info['video']['resolution_x'] = 128;
+ $info['video']['resolution_y'] = 96;
+ break;
+
+ case 5:
+ $info['video']['resolution_x'] = 320;
+ $info['video']['resolution_y'] = 240;
+ break;
+
+ case 6:
+ $info['video']['resolution_x'] = 160;
+ $info['video']['resolution_y'] = 120;
+ break;
+
+ default:
+ $info['video']['resolution_x'] = 0;
+ $info['video']['resolution_y'] = 0;
+ break;
+
+ }
+ }
+ $info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y'];
+ }
+ break;
+
+ // Meta tag
+ case GETID3_FLV_TAG_META:
+ if (!$found_meta) {
+ $found_meta = true;
+ fseek($this->getid3->fp, -1, SEEK_CUR);
+ $datachunk = fread($this->getid3->fp, $DataLength);
+ $AMFstream = new AMFStream($datachunk);
+ $reader = new AMFReader($AMFstream);
+ $eventName = $reader->readData();
+ $info['flv']['meta'][$eventName] = $reader->readData();
+ unset($reader);
+
+ $copykeys = array('framerate'=>'frame_rate', 'width'=>'resolution_x', 'height'=>'resolution_y', 'audiodatarate'=>'bitrate', 'videodatarate'=>'bitrate');
+ foreach ($copykeys as $sourcekey => $destkey) {
+ if (isset($info['flv']['meta']['onMetaData'][$sourcekey])) {
+ switch ($sourcekey) {
+ case 'width':
+ case 'height':
+ $info['video'][$destkey] = intval(round($info['flv']['meta']['onMetaData'][$sourcekey]));
+ break;
+ case 'audiodatarate':
+ $info['audio'][$destkey] = getid3_lib::CastAsInt(round($info['flv']['meta']['onMetaData'][$sourcekey] * 1000));
+ break;
+ case 'videodatarate':
+ case 'frame_rate':
+ default:
+ $info['video'][$destkey] = $info['flv']['meta']['onMetaData'][$sourcekey];
+ break;
+ }
+ }
+ }
+ if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
+ $found_valid_meta_playtime = true;
+ }
+ }
+ break;
+
+ default:
+ // noop
+ break;
+ }
+ fseek($this->getid3->fp, $NextOffset, SEEK_SET);
+ }
+
+ $info['playtime_seconds'] = $Duration / 1000;
+ if ($info['playtime_seconds'] > 0) {
+ $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
+ }
+
+ if ($info['flv']['header']['hasAudio']) {
+ $info['audio']['codec'] = $this->FLVaudioFormat($info['flv']['audio']['audioFormat']);
+ $info['audio']['sample_rate'] = $this->FLVaudioRate($info['flv']['audio']['audioRate']);
+ $info['audio']['bits_per_sample'] = $this->FLVaudioBitDepth($info['flv']['audio']['audioSampleSize']);
+
+ $info['audio']['channels'] = $info['flv']['audio']['audioType'] + 1; // 0=mono,1=stereo
+ $info['audio']['lossless'] = ($info['flv']['audio']['audioFormat'] ? false : true); // 0=uncompressed
+ $info['audio']['dataformat'] = 'flv';
+ }
+ if (!empty($info['flv']['header']['hasVideo'])) {
+ $info['video']['codec'] = $this->FLVvideoCodec($info['flv']['video']['videoCodec']);
+ $info['video']['dataformat'] = 'flv';
+ $info['video']['lossless'] = false;
+ }
+
+ // Set information from meta
+ if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
+ $info['playtime_seconds'] = $info['flv']['meta']['onMetaData']['duration'];
+ $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
+ }
+ if (isset($info['flv']['meta']['onMetaData']['audiocodecid'])) {
+ $info['audio']['codec'] = $this->FLVaudioFormat($info['flv']['meta']['onMetaData']['audiocodecid']);
+ }
+ if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
+ $info['video']['codec'] = $this->FLVvideoCodec($info['flv']['meta']['onMetaData']['videocodecid']);
+ }
+ return true;
+ }
+
+
+ public function FLVaudioFormat($id) {
+ $FLVaudioFormat = array(
+ 0 => 'Linear PCM, platform endian',
+ 1 => 'ADPCM',
+ 2 => 'mp3',
+ 3 => 'Linear PCM, little endian',
+ 4 => 'Nellymoser 16kHz mono',
+ 5 => 'Nellymoser 8kHz mono',
+ 6 => 'Nellymoser',
+ 7 => 'G.711A-law logarithmic PCM',
+ 8 => 'G.711 mu-law logarithmic PCM',
+ 9 => 'reserved',
+ 10 => 'AAC',
+ 11 => false, // unknown?
+ 12 => false, // unknown?
+ 13 => false, // unknown?
+ 14 => 'mp3 8kHz',
+ 15 => 'Device-specific sound',
+ );
+ return (isset($FLVaudioFormat[$id]) ? $FLVaudioFormat[$id] : false);
+ }
+
+ public function FLVaudioRate($id) {
+ $FLVaudioRate = array(
+ 0 => 5500,
+ 1 => 11025,
+ 2 => 22050,
+ 3 => 44100,
+ );
+ return (isset($FLVaudioRate[$id]) ? $FLVaudioRate[$id] : false);
+ }
+
+ public function FLVaudioBitDepth($id) {
+ $FLVaudioBitDepth = array(
+ 0 => 8,
+ 1 => 16,
+ );
+ return (isset($FLVaudioBitDepth[$id]) ? $FLVaudioBitDepth[$id] : false);
+ }
+
+ public function FLVvideoCodec($id) {
+ $FLVvideoCodec = array(
+ GETID3_FLV_VIDEO_H263 => 'Sorenson H.263',
+ GETID3_FLV_VIDEO_SCREEN => 'Screen video',
+ GETID3_FLV_VIDEO_VP6FLV => 'On2 VP6',
+ GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel',
+ GETID3_FLV_VIDEO_SCREENV2 => 'Screen video v2',
+ GETID3_FLV_VIDEO_H264 => 'Sorenson H.264',
+ );
+ return (isset($FLVvideoCodec[$id]) ? $FLVvideoCodec[$id] : false);
+ }
+}
+
+class AMFStream {
+ public $bytes;
+ public $pos;
+
+ public function AMFStream(&$bytes) {
+ $this->bytes =& $bytes;
+ $this->pos = 0;
+ }
+
+ public function readByte() {
+ return getid3_lib::BigEndian2Int(substr($this->bytes, $this->pos++, 1));
+ }
+
+ public function readInt() {
+ return ($this->readByte() << 8) + $this->readByte();
+ }
+
+ public function readLong() {
+ return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
+ }
+
+ public function readDouble() {
+ return getid3_lib::BigEndian2Float($this->read(8));
+ }
+
+ public function readUTF() {
+ $length = $this->readInt();
+ return $this->read($length);
+ }
+
+ public function readLongUTF() {
+ $length = $this->readLong();
+ return $this->read($length);
+ }
+
+ public function read($length) {
+ $val = substr($this->bytes, $this->pos, $length);
+ $this->pos += $length;
+ return $val;
+ }
+
+ public function peekByte() {
+ $pos = $this->pos;
+ $val = $this->readByte();
+ $this->pos = $pos;
+ return $val;
+ }
+
+ public function peekInt() {
+ $pos = $this->pos;
+ $val = $this->readInt();
+ $this->pos = $pos;
+ return $val;
+ }
+
+ public function peekLong() {
+ $pos = $this->pos;
+ $val = $this->readLong();
+ $this->pos = $pos;
+ return $val;
+ }
+
+ public function peekDouble() {
+ $pos = $this->pos;
+ $val = $this->readDouble();
+ $this->pos = $pos;
+ return $val;
+ }
+
+ public function peekUTF() {
+ $pos = $this->pos;
+ $val = $this->readUTF();
+ $this->pos = $pos;
+ return $val;
+ }
+
+ public function peekLongUTF() {
+ $pos = $this->pos;
+ $val = $this->readLongUTF();
+ $this->pos = $pos;
+ return $val;
+ }
+}
+
+class AMFReader {
+ public $stream;
+
+ public function AMFReader(&$stream) {
+ $this->stream =& $stream;
+ }
+
+ public function readData() {
+ $value = null;
+
+ $type = $this->stream->readByte();
+ switch ($type) {
+
+ // Double
+ case 0:
+ $value = $this->readDouble();
+ break;
+
+ // Boolean
+ case 1:
+ $value = $this->readBoolean();
+ break;
+
+ // String
+ case 2:
+ $value = $this->readString();
+ break;
+
+ // Object
+ case 3:
+ $value = $this->readObject();
+ break;
+
+ // null
+ case 6:
+ return null;
+ break;
+
+ // Mixed array
+ case 8:
+ $value = $this->readMixedArray();
+ break;
+
+ // Array
+ case 10:
+ $value = $this->readArray();
+ break;
+
+ // Date
+ case 11:
+ $value = $this->readDate();
+ break;
+
+ // Long string
+ case 13:
+ $value = $this->readLongString();
+ break;
+
+ // XML (handled as string)
+ case 15:
+ $value = $this->readXML();
+ break;
+
+ // Typed object (handled as object)
+ case 16:
+ $value = $this->readTypedObject();
+ break;
+
+ // Long string
+ default:
+ $value = '(unknown or unsupported data type)';
+ break;
+ }
+
+ return $value;
+ }
+
+ public function readDouble() {
+ return $this->stream->readDouble();
+ }
+
+ public function readBoolean() {
+ return $this->stream->readByte() == 1;
+ }
+
+ public function readString() {
+ return $this->stream->readUTF();
+ }
+
+ public function readObject() {
+ // Get highest numerical index - ignored
+// $highestIndex = $this->stream->readLong();
+
+ $data = array();
+
+ while ($key = $this->stream->readUTF()) {
+ $data[$key] = $this->readData();
+ }
+ // Mixed array record ends with empty string (0x00 0x00) and 0x09
+ if (($key == '') && ($this->stream->peekByte() == 0x09)) {
+ // Consume byte
+ $this->stream->readByte();
+ }
+ return $data;
+ }
+
+ public function readMixedArray() {
+ // Get highest numerical index - ignored
+ $highestIndex = $this->stream->readLong();
+
+ $data = array();
+
+ while ($key = $this->stream->readUTF()) {
+ if (is_numeric($key)) {
+ $key = (float) $key;
+ }
+ $data[$key] = $this->readData();
+ }
+ // Mixed array record ends with empty string (0x00 0x00) and 0x09
+ if (($key == '') && ($this->stream->peekByte() == 0x09)) {
+ // Consume byte
+ $this->stream->readByte();
+ }
+
+ return $data;
+ }
+
+ public function readArray() {
+ $length = $this->stream->readLong();
+ $data = array();
+
+ for ($i = 0; $i < $length; $i++) {
+ $data[] = $this->readData();
+ }
+ return $data;
+ }
+
+ public function readDate() {
+ $timestamp = $this->stream->readDouble();
+ $timezone = $this->stream->readInt();
+ return $timestamp;
+ }
+
+ public function readLongString() {
+ return $this->stream->readLongUTF();
+ }
+
+ public function readXML() {
+ return $this->stream->readLongUTF();
+ }
+
+ public function readTypedObject() {
+ $className = $this->stream->readUTF();
+ return $this->readObject();
+ }
+}
+
+class AVCSequenceParameterSetReader {
+ public $sps;
+ public $start = 0;
+ public $currentBytes = 0;
+ public $currentBits = 0;
+ public $width;
+ public $height;
+
+ public function AVCSequenceParameterSetReader($sps) {
+ $this->sps = $sps;
+ }
+
+ public function readData() {
+ $this->skipBits(8);
+ $this->skipBits(8);
+ $profile = $this->getBits(8); // read profile
+ $this->skipBits(16);
+ $this->expGolombUe(); // read sps id
+ if (in_array($profile, array(H264_PROFILE_HIGH, H264_PROFILE_HIGH10, H264_PROFILE_HIGH422, H264_PROFILE_HIGH444, H264_PROFILE_HIGH444_PREDICTIVE))) {
+ if ($this->expGolombUe() == 3) {
+ $this->skipBits(1);
+ }
+ $this->expGolombUe();
+ $this->expGolombUe();
+ $this->skipBits(1);
+ if ($this->getBit()) {
+ for ($i = 0; $i < 8; $i++) {
+ if ($this->getBit()) {
+ $size = $i < 6 ? 16 : 64;
+ $lastScale = 8;
+ $nextScale = 8;
+ for ($j = 0; $j < $size; $j++) {
+ if ($nextScale != 0) {
+ $deltaScale = $this->expGolombUe();
+ $nextScale = ($lastScale + $deltaScale + 256) % 256;
+ }
+ if ($nextScale != 0) {
+ $lastScale = $nextScale;
+ }
+ }
+ }
+ }
+ }
+ }
+ $this->expGolombUe();
+ $pocType = $this->expGolombUe();
+ if ($pocType == 0) {
+ $this->expGolombUe();
+ } elseif ($pocType == 1) {
+ $this->skipBits(1);
+ $this->expGolombSe();
+ $this->expGolombSe();
+ $pocCycleLength = $this->expGolombUe();
+ for ($i = 0; $i < $pocCycleLength; $i++) {
+ $this->expGolombSe();
+ }
+ }
+ $this->expGolombUe();
+ $this->skipBits(1);
+ $this->width = ($this->expGolombUe() + 1) * 16;
+ $heightMap = $this->expGolombUe() + 1;
+ $this->height = (2 - $this->getBit()) * $heightMap * 16;
+ }
+
+ public function skipBits($bits) {
+ $newBits = $this->currentBits + $bits;
+ $this->currentBytes += (int)floor($newBits / 8);
+ $this->currentBits = $newBits % 8;
+ }
+
+ public function getBit() {
+ $result = (getid3_lib::BigEndian2Int(substr($this->sps, $this->currentBytes, 1)) >> (7 - $this->currentBits)) & 0x01;
+ $this->skipBits(1);
+ return $result;
+ }
+
+ public function getBits($bits) {
+ $result = 0;
+ for ($i = 0; $i < $bits; $i++) {
+ $result = ($result << 1) + $this->getBit();
+ }
+ return $result;
+ }
+
+ public function expGolombUe() {
+ $significantBits = 0;
+ $bit = $this->getBit();
+ while ($bit == 0) {
+ $significantBits++;
+ $bit = $this->getBit();
+
+ if ($significantBits > 31) {
+ // something is broken, this is an emergency escape to prevent infinite loops
+ return 0;
+ }
+ }
+ return (1 << $significantBits) + $this->getBits($significantBits) - 1;
+ }
+
+ public function expGolombSe() {
+ $result = $this->expGolombUe();
+ if (($result & 0x01) == 0) {
+ return -($result >> 1);
+ } else {
+ return ($result + 1) >> 1;
+ }
+ }
+
+ public function getWidth() {
+ return $this->width;
+ }
+
+ public function getHeight() {
+ return $this->height;
+ }
+}