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<?php |
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///////////////////////////////////////////////////////////////// |
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/// getID3() by James Heinrich <[email protected]> // |
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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 <[email protected]> // |
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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 <[email protected]> // |
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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 ($info['flv']['header']['signature'] != self::magic) { |
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$info['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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View Code Duplication |
case 0: |
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//$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)); |
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188
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//$PictureSizeEnc <<= 1; |
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189
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//$info['video']['resolution_x'] = ($PictureSizeEnc & 0xFF00) >> 8; |
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190
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//$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2)); |
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191
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//$PictureSizeEnc <<= 1; |
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192
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//$info['video']['resolution_y'] = ($PictureSizeEnc & 0xFF00) >> 8; |
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193
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194
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$PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2)) >> 7; |
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195
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$PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) >> 7; |
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196
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$info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFF; |
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197
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$info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFF; |
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break; |
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200
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View Code Duplication |
case 1: |
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201
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$PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3)) >> 7; |
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202
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$PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) >> 7; |
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203
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$info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xFFFF; |
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204
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$info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xFFFF; |
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break; |
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View Code Duplication |
case 2: |
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$info['video']['resolution_x'] = 352; |
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$info['video']['resolution_y'] = 288; |
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break; |
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View Code Duplication |
case 3: |
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$info['video']['resolution_x'] = 176; |
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$info['video']['resolution_y'] = 144; |
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break; |
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217
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View Code Duplication |
case 4: |
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$info['video']['resolution_x'] = 128; |
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$info['video']['resolution_y'] = 96; |
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break; |
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View Code Duplication |
case 5: |
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$info['video']['resolution_x'] = 320; |
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$info['video']['resolution_y'] = 240; |
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break; |
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View Code Duplication |
case 6: |
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$info['video']['resolution_x'] = 160; |
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$info['video']['resolution_y'] = 120; |
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break; |
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View Code Duplication |
default: |
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$info['video']['resolution_x'] = 0; |
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234
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$info['video']['resolution_y'] = 0; |
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235
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break; |
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236
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} |
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} elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_VP6FLV_ALPHA) { |
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241
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/* contributed by schouwerwouØgmail*com */ |
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if (!isset($info['video']['resolution_x'])) { // only when meta data isn't set |
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243
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$PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2)); |
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$PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2)); |
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245
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$info['video']['resolution_x'] = ($PictureSizeEnc['x'] & 0xFF) << 3; |
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246
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$info['video']['resolution_y'] = ($PictureSizeEnc['y'] & 0xFF) << 3; |
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} |
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/* end schouwerwouØgmail*com */ |
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249
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} |
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if (!empty($info['video']['resolution_x']) && !empty($info['video']['resolution_y'])) { |
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252
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$info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y']; |
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253
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} |
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254
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} |
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255
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break; |
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256
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257
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// Meta tag |
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258
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case GETID3_FLV_TAG_META: |
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if (!$found_meta) { |
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260
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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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263
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$AMFstream = new AMFStream($datachunk); |
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264
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$reader = new AMFReader($AMFstream); |
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265
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$eventName = $reader->readData(); |
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$info['flv']['meta'][$eventName] = $reader->readData(); |
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267
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unset($reader); |
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$copykeys = array('framerate'=>'frame_rate', 'width'=>'resolution_x', 'height'=>'resolution_y', 'audiodatarate'=>'bitrate', 'videodatarate'=>'bitrate'); |
|
270
|
|
|
foreach ($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
|
|
|
$info['video']['lossless'] = false; |
|
319
|
|
|
} |
|
320
|
|
|
|
|
321
|
|
|
// Set information from meta |
|
322
|
|
View Code Duplication |
if (!empty($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
|
|
|
} |
|
746
|
|
|
|
ntwb /
wordpress
Loading history...
Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArrayis initialized the first time when the foreach loop is entered. You can also see that the value of thebarkey is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.