getid3_flv
The WordPress Core getid3 flv class.
Defined (1)
The class is defined in the following location(s).
- /wp-includes/ID3/module.audio-video.flv.php
- class getid3_flv extends getid3_handler {
- const magic = 'FLV';
- 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;
- $this->fseek($info['avdataoffset']);
- $FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
- $FLVheader = $this->fread(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));
- if ($info['flv']['header']['signature'] != self::magic) {
- $info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes(self::magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['flv']['header']['signature']).'"';
- unset($info['flv'], $info['fileformat']);
- return false;
- }
- $info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x04);
- $info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x01);
- $FrameSizeDataLength = getid3_lib::BigEndian2Int($this->fread(4));
- $FLVheaderFrameLength = 9;
- if ($FrameSizeDataLength > $FLVheaderFrameLength) {
- $this->fseek($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 ((($this->ftell() + 16) < $info['avdataend']) && (($tagParseCount++ <= $this->max_frames) || !$found_valid_meta_playtime)) {
- $ThisTagHeader = $this->fread(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 = $this->ftell() - 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 = $this->fread(11);
- if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
- // this code block contributed by: moysevichgmail*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 = $this->fread($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'] = $spsReader->getHeight();
- }
- }
- }
- // end: moysevichgmail*com
- } elseif ($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)) >> 7;
- $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) >> 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)) >> 7;
- $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) >> 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;
- $info['video']['resolution_y'] = 0;
- break;
- }
- } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_VP6FLV_ALPHA) {
- /** contributed by schouwerwougmail*com */
- if (!isset($info['video']['resolution_x'])) { // only when meta data isn't set
- $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
- $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2));
- $info['video']['resolution_x'] = ($PictureSizeEnc['x'] & 0xFF) << 3;
- $info['video']['resolution_y'] = ($PictureSizeEnc['y'] & 0xFF) << 3;
- }
- /** end schouwerwougmail*com */
- }
- if (!empty($info['video']['resolution_x']) && !empty($info['video']['resolution_y'])) {
- $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;
- $this->fseek(-1, SEEK_CUR);
- $datachunk = $this->fread($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;
- }
- $this->fseek($NextOffset);
- }
- $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']) {
- $info['audio']['codec'] = self::audioFormatLookup($info['flv']['audio']['audioFormat']);
- $info['audio']['sample_rate'] = self::audioRateLookup($info['flv']['audio']['audioRate']);
- $info['audio']['bits_per_sample'] = self::audioBitDepthLookup($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'])) {
- $info['video']['codec'] = self::videoCodecLookup($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'])) {
- $info['audio']['codec'] = self::audioFormatLookup($info['flv']['meta']['onMetaData']['audiocodecid']);
- }
- if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
- $info['video']['codec'] = self::videoCodecLookup($info['flv']['meta']['onMetaData']['videocodecid']);
- }
- return true;
- }
- public static function audioFormatLookup($id) {
- static $lookup = array(
- 0 => 'Linear PCM, platform endian',
- 1 => 'ADPCM',
- 2 => 'mp3',
- 3 => 'Linear PCM, little endian',
- 4 => 'Nellymoser 16kHz mono',
- 5 => 'Nellymoser 8kHz mono',
- 6 => 'Nellymoser',
- 7 => 'G.711A-law logarithmic PCM',
- 8 => 'G.711 mu-law logarithmic PCM',
- 9 => 'reserved',
- 10 => 'AAC',
- 11 => 'Speex',
- 12 => false, // unknown?
- 13 => false, // unknown?
- 14 => 'mp3 8kHz',
- 15 => 'Device-specific sound',
- );
- return (isset($lookup[$id]) ? $lookup[$id] : false);
- }
- public static function audioRateLookup($id) {
- static $lookup = array(
- 0 => 5500,
- 1 => 11025,
- 2 => 22050,
- 3 => 44100,
- );
- return (isset($lookup[$id]) ? $lookup[$id] : false);
- }
- public static function audioBitDepthLookup($id) {
- static $lookup = array(
- 0 => 8,
- 1 => 16,
- );
- return (isset($lookup[$id]) ? $lookup[$id] : false);
- }
- public static function videoCodecLookup($id) {
- static $lookup = array(
- GETID3_FLV_VIDEO_H263 => 'Sorenson H.263',
- GETID3_FLV_VIDEO_SCREEN => 'Screen video',
- GETID3_FLV_VIDEO_VP6FLV => 'On2 VP6',
- GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel',
- GETID3_FLV_VIDEO_SCREENV2 => 'Screen video v2',
- GETID3_FLV_VIDEO_H264 => 'Sorenson H.264',
- );
- return (isset($lookup[$id]) ? $lookup[$id] : false);
- }
- }