746 lines
25 KiB
PHP
746 lines
25 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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// also https://github.com/JamesHeinrich/getID3 //
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// //
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// FLV module by Seth Kaufman <sethØwhirl-i-gig*com> //
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// //
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// * version 0.1 (26 June 2005) //
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// //
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// //
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// * version 0.1.1 (15 July 2005) //
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// minor modifications by James Heinrich <info@getid3.org> //
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// //
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// * version 0.2 (22 February 2006) //
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// Support for On2 VP6 codec and meta information //
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// by Steve Webster <steve.websterØfeaturecreep*com> //
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// //
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// * version 0.3 (15 June 2006) //
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// Modified to not read entire file into memory //
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// by James Heinrich <info@getid3.org> //
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// //
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// * version 0.4 (07 December 2007) //
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// Bugfixes for incorrectly parsed FLV dimensions //
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// and incorrect parsing of onMetaTag //
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// by Evgeny Moysevich <moysevichØgmail*com> //
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// //
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// * version 0.5 (21 May 2009) //
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// Fixed parsing of audio tags and added additional codec //
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// details. The duration is now read from onMetaTag (if //
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// exists), rather than parsing whole file //
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// by Nigel Barnes <ngbarnesØhotmail*com> //
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// //
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// * version 0.6 (24 May 2009) //
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// Better parsing of files with h264 video //
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// by Evgeny Moysevich <moysevichØgmail*com> //
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// //
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// * version 0.6.1 (30 May 2011) //
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// prevent infinite loops in expGolombUe() //
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// //
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// * version 0.7.0 (16 Jul 2013) //
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// handle GETID3_FLV_VIDEO_VP6FLV_ALPHA //
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// improved AVCSequenceParameterSetReader::readData() //
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// by Xander Schouwerwou <schouwerwouØgmail*com> //
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// //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio-video.flv.php //
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// module for analyzing Shockwave Flash Video files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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define('GETID3_FLV_TAG_AUDIO', 8);
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define('GETID3_FLV_TAG_VIDEO', 9);
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define('GETID3_FLV_TAG_META', 18);
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define('GETID3_FLV_VIDEO_H263', 2);
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define('GETID3_FLV_VIDEO_SCREEN', 3);
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define('GETID3_FLV_VIDEO_VP6FLV', 4);
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define('GETID3_FLV_VIDEO_VP6FLV_ALPHA', 5);
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define('GETID3_FLV_VIDEO_SCREENV2', 6);
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define('GETID3_FLV_VIDEO_H264', 7);
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define('H264_AVC_SEQUENCE_HEADER', 0);
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define('H264_PROFILE_BASELINE', 66);
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define('H264_PROFILE_MAIN', 77);
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define('H264_PROFILE_EXTENDED', 88);
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define('H264_PROFILE_HIGH', 100);
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define('H264_PROFILE_HIGH10', 110);
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define('H264_PROFILE_HIGH422', 122);
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define('H264_PROFILE_HIGH444', 144);
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define('H264_PROFILE_HIGH444_PREDICTIVE', 244);
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class getid3_flv extends getid3_handler {
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const magic = 'FLV';
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public $max_frames = 100000; // break out of the loop if too many frames have been scanned; only scan this many if meta frame does not contain useful duration
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public function Analyze() {
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$info = &$this->getid3->info;
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$this->fseek($info['avdataoffset']);
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$FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
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$FLVheader = $this->fread(5);
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$info['fileformat'] = 'flv';
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$info['flv']['header']['signature'] = substr($FLVheader, 0, 3);
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$info['flv']['header']['version'] = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
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$TypeFlags = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));
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if ($info['flv']['header']['signature'] != self::magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes(self::magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['flv']['header']['signature']).'"');
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unset($info['flv'], $info['fileformat']);
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return false;
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}
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$info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x04);
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$info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x01);
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$FrameSizeDataLength = getid3_lib::BigEndian2Int($this->fread(4));
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$FLVheaderFrameLength = 9;
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if ($FrameSizeDataLength > $FLVheaderFrameLength) {
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$this->fseek($FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
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}
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$Duration = 0;
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$found_video = false;
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$found_audio = false;
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$found_meta = false;
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$found_valid_meta_playtime = false;
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$tagParseCount = 0;
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$info['flv']['framecount'] = array('total'=>0, 'audio'=>0, 'video'=>0);
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$flv_framecount = &$info['flv']['framecount'];
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while ((($this->ftell() + 16) < $info['avdataend']) && (($tagParseCount++ <= $this->max_frames) || !$found_valid_meta_playtime)) {
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$ThisTagHeader = $this->fread(16);
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$PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 0, 4));
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$TagType = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 4, 1));
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$DataLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 5, 3));
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$Timestamp = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 8, 3));
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$LastHeaderByte = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
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$NextOffset = $this->ftell() - 1 + $DataLength;
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if ($Timestamp > $Duration) {
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$Duration = $Timestamp;
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}
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$flv_framecount['total']++;
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switch ($TagType) {
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case GETID3_FLV_TAG_AUDIO:
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$flv_framecount['audio']++;
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if (!$found_audio) {
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$found_audio = true;
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$info['flv']['audio']['audioFormat'] = ($LastHeaderByte >> 4) & 0x0F;
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$info['flv']['audio']['audioRate'] = ($LastHeaderByte >> 2) & 0x03;
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$info['flv']['audio']['audioSampleSize'] = ($LastHeaderByte >> 1) & 0x01;
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$info['flv']['audio']['audioType'] = $LastHeaderByte & 0x01;
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}
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break;
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case GETID3_FLV_TAG_VIDEO:
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$flv_framecount['video']++;
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if (!$found_video) {
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$found_video = true;
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$info['flv']['video']['videoCodec'] = $LastHeaderByte & 0x07;
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$FLVvideoHeader = $this->fread(11);
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if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
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// this code block contributed by: moysevichØgmail*com
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$AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
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if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
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// read AVCDecoderConfigurationRecord
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$configurationVersion = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 1));
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$AVCProfileIndication = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 1));
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$profile_compatibility = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 1));
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$lengthSizeMinusOne = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 1));
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$numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 8, 1));
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if (($numOfSequenceParameterSets & 0x1F) != 0) {
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// there is at least one SequenceParameterSet
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// read size of the first SequenceParameterSet
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//$spsSize = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 9, 2));
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$spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
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// read the first SequenceParameterSet
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$sps = $this->fread($spsSize);
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if (strlen($sps) == $spsSize) { // make sure that whole SequenceParameterSet was red
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$spsReader = new AVCSequenceParameterSetReader($sps);
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$spsReader->readData();
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$info['video']['resolution_x'] = $spsReader->getWidth();
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$info['video']['resolution_y'] = $spsReader->getHeight();
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}
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}
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}
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// end: moysevichØgmail*com
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} elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H263) {
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$PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2))) >> 7;
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$PictureSizeType = $PictureSizeType & 0x0007;
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$info['flv']['header']['videoSizeType'] = $PictureSizeType;
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switch ($PictureSizeType) {
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case 0:
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//$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
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//$PictureSizeEnc <<= 1;
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//$info['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8;
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//$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
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//$PictureSizeEnc <<= 1;
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//$info['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8;
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$PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2)) >> 7;
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$PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) >> 7;
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$info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFF;
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$info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFF;
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break;
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case 1:
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$PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3)) >> 7;
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$PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) >> 7;
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$info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFFFF;
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$info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFFFF;
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break;
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case 2:
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$info['video']['resolution_x'] = 352;
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$info['video']['resolution_y'] = 288;
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break;
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case 3:
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$info['video']['resolution_x'] = 176;
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$info['video']['resolution_y'] = 144;
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break;
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case 4:
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$info['video']['resolution_x'] = 128;
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$info['video']['resolution_y'] = 96;
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break;
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case 5:
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$info['video']['resolution_x'] = 320;
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$info['video']['resolution_y'] = 240;
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break;
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case 6:
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$info['video']['resolution_x'] = 160;
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$info['video']['resolution_y'] = 120;
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break;
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default:
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$info['video']['resolution_x'] = 0;
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$info['video']['resolution_y'] = 0;
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break;
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}
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} elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_VP6FLV_ALPHA) {
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/* contributed by schouwerwouØgmail*com */
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if (!isset($info['video']['resolution_x'])) { // only when meta data isn't set
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$PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
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$PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2));
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$info['video']['resolution_x'] = ($PictureSizeEnc['x'] & 0xFF) << 3;
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$info['video']['resolution_y'] = ($PictureSizeEnc['y'] & 0xFF) << 3;
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}
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/* end schouwerwouØgmail*com */
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}
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if (!empty($info['video']['resolution_x']) && !empty($info['video']['resolution_y'])) {
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$info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y'];
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}
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}
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break;
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// Meta tag
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case GETID3_FLV_TAG_META:
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if (!$found_meta) {
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$found_meta = true;
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$this->fseek(-1, SEEK_CUR);
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$datachunk = $this->fread($DataLength);
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$AMFstream = new AMFStream($datachunk);
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$reader = new AMFReader($AMFstream);
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$eventName = $reader->readData();
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$info['flv']['meta'][$eventName] = $reader->readData();
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unset($reader);
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$copykeys = array('framerate'=>'frame_rate', 'width'=>'resolution_x', 'height'=>'resolution_y', 'audiodatarate'=>'bitrate', 'videodatarate'=>'bitrate');
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foreach ($copykeys as $sourcekey => $destkey) {
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if (isset($info['flv']['meta']['onMetaData'][$sourcekey])) {
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switch ($sourcekey) {
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case 'width':
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case 'height':
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$info['video'][$destkey] = intval(round($info['flv']['meta']['onMetaData'][$sourcekey]));
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break;
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case 'audiodatarate':
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$info['audio'][$destkey] = getid3_lib::CastAsInt(round($info['flv']['meta']['onMetaData'][$sourcekey] * 1000));
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break;
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case 'videodatarate':
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case 'frame_rate':
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default:
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$info['video'][$destkey] = $info['flv']['meta']['onMetaData'][$sourcekey];
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break;
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}
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}
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}
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if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
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$found_valid_meta_playtime = true;
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}
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}
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break;
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default:
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// noop
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break;
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}
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$this->fseek($NextOffset);
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}
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$info['playtime_seconds'] = $Duration / 1000;
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if ($info['playtime_seconds'] > 0) {
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$info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
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}
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if ($info['flv']['header']['hasAudio']) {
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$info['audio']['codec'] = self::audioFormatLookup($info['flv']['audio']['audioFormat']);
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$info['audio']['sample_rate'] = self::audioRateLookup($info['flv']['audio']['audioRate']);
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$info['audio']['bits_per_sample'] = self::audioBitDepthLookup($info['flv']['audio']['audioSampleSize']);
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$info['audio']['channels'] = $info['flv']['audio']['audioType'] + 1; // 0=mono,1=stereo
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$info['audio']['lossless'] = ($info['flv']['audio']['audioFormat'] ? false : true); // 0=uncompressed
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$info['audio']['dataformat'] = 'flv';
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}
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if (!empty($info['flv']['header']['hasVideo'])) {
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$info['video']['codec'] = self::videoCodecLookup($info['flv']['video']['videoCodec']);
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$info['video']['dataformat'] = 'flv';
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$info['video']['lossless'] = false;
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}
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// Set information from meta
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if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
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$info['playtime_seconds'] = $info['flv']['meta']['onMetaData']['duration'];
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$info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
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}
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if (isset($info['flv']['meta']['onMetaData']['audiocodecid'])) {
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$info['audio']['codec'] = self::audioFormatLookup($info['flv']['meta']['onMetaData']['audiocodecid']);
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}
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if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
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$info['video']['codec'] = self::videoCodecLookup($info['flv']['meta']['onMetaData']['videocodecid']);
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}
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return true;
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}
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public static function audioFormatLookup($id) {
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static $lookup = array(
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0 => 'Linear PCM, platform endian',
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1 => 'ADPCM',
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2 => 'mp3',
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3 => 'Linear PCM, little endian',
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4 => 'Nellymoser 16kHz mono',
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5 => 'Nellymoser 8kHz mono',
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6 => 'Nellymoser',
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7 => 'G.711A-law logarithmic PCM',
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8 => 'G.711 mu-law logarithmic PCM',
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9 => 'reserved',
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10 => 'AAC',
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11 => 'Speex',
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12 => false, // unknown?
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13 => false, // unknown?
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14 => 'mp3 8kHz',
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15 => 'Device-specific sound',
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);
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return (isset($lookup[$id]) ? $lookup[$id] : false);
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}
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public static function audioRateLookup($id) {
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static $lookup = array(
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0 => 5500,
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1 => 11025,
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2 => 22050,
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3 => 44100,
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);
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return (isset($lookup[$id]) ? $lookup[$id] : false);
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}
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public static function audioBitDepthLookup($id) {
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static $lookup = array(
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0 => 8,
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1 => 16,
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);
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return (isset($lookup[$id]) ? $lookup[$id] : false);
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}
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public static function videoCodecLookup($id) {
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static $lookup = array(
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GETID3_FLV_VIDEO_H263 => 'Sorenson H.263',
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GETID3_FLV_VIDEO_SCREEN => 'Screen video',
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GETID3_FLV_VIDEO_VP6FLV => 'On2 VP6',
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GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel',
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GETID3_FLV_VIDEO_SCREENV2 => 'Screen video v2',
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GETID3_FLV_VIDEO_H264 => 'Sorenson H.264',
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);
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return (isset($lookup[$id]) ? $lookup[$id] : false);
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}
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}
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class AMFStream {
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public $bytes;
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public $pos;
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public function __construct(&$bytes) {
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$this->bytes =& $bytes;
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$this->pos = 0;
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}
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public function readByte() {
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return getid3_lib::BigEndian2Int(substr($this->bytes, $this->pos++, 1));
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}
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public function readInt() {
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return ($this->readByte() << 8) + $this->readByte();
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}
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public function readLong() {
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return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
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}
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public function readDouble() {
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return getid3_lib::BigEndian2Float($this->read(8));
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}
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public function readUTF() {
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$length = $this->readInt();
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return $this->read($length);
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}
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public function readLongUTF() {
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$length = $this->readLong();
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return $this->read($length);
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}
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public function read($length) {
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$val = substr($this->bytes, $this->pos, $length);
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$this->pos += $length;
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return $val;
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}
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public function peekByte() {
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$pos = $this->pos;
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$val = $this->readByte();
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$this->pos = $pos;
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return $val;
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}
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|
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public function peekInt() {
|
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$pos = $this->pos;
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$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 $stream;
|
|
|
|
public function __construct(&$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 $height;
|
|
|
|
public function __construct($sps) {
|
|
$this->sps = $sps;
|
|
}
|
|
|
|
public function readData() {
|
|
$this->skipBits(8);
|
|
$this->skipBits(8);
|
|
$profile = $this->getBits(8); // read profile
|
|
if ($profile > 0) {
|
|
$this->skipBits(8);
|
|
$level_idc = $this->getBits(8); // level_idc
|
|
$this->expGolombUe(); // seq_parameter_set_id // sps
|
|
$this->expGolombUe(); // log2_max_frame_num_minus4
|
|
$picOrderType = $this->expGolombUe(); // pic_order_cnt_type
|
|
if ($picOrderType == 0) {
|
|
$this->expGolombUe(); // log2_max_pic_order_cnt_lsb_minus4
|
|
} elseif ($picOrderType == 1) {
|
|
$this->skipBits(1); // delta_pic_order_always_zero_flag
|
|
$this->expGolombSe(); // offset_for_non_ref_pic
|
|
$this->expGolombSe(); // offset_for_top_to_bottom_field
|
|
$num_ref_frames_in_pic_order_cnt_cycle = $this->expGolombUe(); // num_ref_frames_in_pic_order_cnt_cycle
|
|
for ($i = 0; $i < $num_ref_frames_in_pic_order_cnt_cycle; $i++) {
|
|
$this->expGolombSe(); // offset_for_ref_frame[ i ]
|
|
}
|
|
}
|
|
$this->expGolombUe(); // num_ref_frames
|
|
$this->skipBits(1); // gaps_in_frame_num_value_allowed_flag
|
|
$pic_width_in_mbs_minus1 = $this->expGolombUe(); // pic_width_in_mbs_minus1
|
|
$pic_height_in_map_units_minus1 = $this->expGolombUe(); // pic_height_in_map_units_minus1
|
|
|
|
$frame_mbs_only_flag = $this->getBits(1); // frame_mbs_only_flag
|
|
if ($frame_mbs_only_flag == 0) {
|
|
$this->skipBits(1); // mb_adaptive_frame_field_flag
|
|
}
|
|
$this->skipBits(1); // direct_8x8_inference_flag
|
|
$frame_cropping_flag = $this->getBits(1); // frame_cropping_flag
|
|
|
|
$frame_crop_left_offset = 0;
|
|
$frame_crop_right_offset = 0;
|
|
$frame_crop_top_offset = 0;
|
|
$frame_crop_bottom_offset = 0;
|
|
|
|
if ($frame_cropping_flag) {
|
|
$frame_crop_left_offset = $this->expGolombUe(); // frame_crop_left_offset
|
|
$frame_crop_right_offset = $this->expGolombUe(); // frame_crop_right_offset
|
|
$frame_crop_top_offset = $this->expGolombUe(); // frame_crop_top_offset
|
|
$frame_crop_bottom_offset = $this->expGolombUe(); // frame_crop_bottom_offset
|
|
}
|
|
$this->skipBits(1); // vui_parameters_present_flag
|
|
// etc
|
|
|
|
$this->width = (($pic_width_in_mbs_minus1 + 1) * 16) - ($frame_crop_left_offset * 2) - ($frame_crop_right_offset * 2);
|
|
$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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|