Ts.php

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<?php
 
namespace GetId3\Module\AudioVideo;
 
use GetId3\Handler\BaseHandler;
use GetId3\Lib\Helper;
 
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
// See readme.txt for more details                             //
//                                                             //
// module.audio-video.ts.php                                   //
// module for analyzing MPEG Transport Stream (.ts) files      //
// dependencies: NONE                                          //
//                                                            ///
 
class Ts extends BaseHandler
{
 
    public function analyze()
    {
        $info = &$this->getid3->info;
 
        fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
        $TSheader = fread($this->getid3->fp, 19);
        $magic = "\x47";
        if (substr($TSheader, 0, 1) != $magic) {
            $info['error'][] = 'Expecting "'.Helper::PrintHexBytes($magic).'" at '.$info['avdataoffset'].', found '.Helper::PrintHexBytes(substr($TSheader, 0, 1)).' instead.';
 
            return false;
        }
        $info['fileformat'] = 'ts';
 
        // http://en.wikipedia.org/wiki/.ts
 
        $offset = 0;
        $info['ts']['packet']['sync'] = Helper::BigEndian2Int(substr($TSheader, $offset, 1)); $offset += 1;
        $pid_flags_raw                = Helper::BigEndian2Int(substr($TSheader, $offset, 2)); $offset += 2;
        $SAC_raw                      = Helper::BigEndian2Int(substr($TSheader, $offset, 1)); $offset += 1;
        $info['ts']['packet']['flags']['transport_error_indicator']    =      (bool) ($pid_flags_raw & 0x8000);      // Set by demodulator if can't correct errors in the stream, to tell the demultiplexer that the packet has an uncorrectable error
        $info['ts']['packet']['flags']['payload_unit_start_indicator'] =      (bool) ($pid_flags_raw & 0x4000);      // 1 means start of PES data or PSI otherwise zero only.
        $info['ts']['packet']['flags']['transport_high_priority']      =      (bool) ($pid_flags_raw & 0x2000);      // 1 means higher priority than other packets with the same PID.
        $info['ts']['packet']['packet_id']                             =             ($pid_flags_raw & 0x1FFF) >> 0;
 
        $info['ts']['packet']['raw']['scrambling_control']             =                   ($SAC_raw &   0xC0) >> 6;
        $info['ts']['packet']['flags']['adaption_field_exists']        =      (bool) ($SAC_raw &   0x20);
        $info['ts']['packet']['flags']['payload_exists']               =      (bool) ($SAC_raw &   0x10);
        $info['ts']['packet']['continuity_counter']                    =                   ($SAC_raw &   0x0F) >> 0; // Incremented only when a payload is present
        $info['ts']['packet']['scrambling_control']                    = $this->TSscramblingControlLookup($info['ts']['packet']['raw']['scrambling_control']);
 
        if ($info['ts']['packet']['flags']['adaption_field_exists']) {
            $AdaptionField_raw        = Helper::BigEndian2Int(substr($TSheader, $offset, 2)); $offset += 2;
            $info['ts']['packet']['adaption']['field_length']           =        ($AdaptionField_raw & 0xFF00) >> 8;  // Number of bytes in the adaptation field immediately following this byte
            $info['ts']['packet']['adaption']['flags']['discontinuity'] = (bool) ($AdaptionField_raw & 0x0080);       // Set to 1 if current TS packet is in a discontinuity state with respect to either the continuity counter or the program clock reference
            $info['ts']['packet']['adaption']['flags']['random_access'] = (bool) ($AdaptionField_raw & 0x0040);       // Set to 1 if the PES packet in this TS packet starts a video/audio sequence
            $info['ts']['packet']['adaption']['flags']['high_priority'] = (bool) ($AdaptionField_raw & 0x0020);       // 1 = higher priority
            $info['ts']['packet']['adaption']['flags']['pcr']           = (bool) ($AdaptionField_raw & 0x0010);       // 1 means adaptation field does contain a PCR field
            $info['ts']['packet']['adaption']['flags']['opcr']          = (bool) ($AdaptionField_raw & 0x0008);       // 1 means adaptation field does contain an OPCR field
            $info['ts']['packet']['adaption']['flags']['splice_point']  = (bool) ($AdaptionField_raw & 0x0004);       // 1 means presence of splice countdown field in adaptation field
            $info['ts']['packet']['adaption']['flags']['private_data']  = (bool) ($AdaptionField_raw & 0x0002);       // 1 means presence of private data bytes in adaptation field
            $info['ts']['packet']['adaption']['flags']['extension']     = (bool) ($AdaptionField_raw & 0x0001);       // 1 means presence of adaptation field extension
            if ($info['ts']['packet']['adaption']['flags']['pcr']) {
                $info['ts']['packet']['adaption']['raw']['pcr'] = Helper::BigEndian2Int(substr($TSheader, $offset, 6)); $offset += 6;
            }
            if ($info['ts']['packet']['adaption']['flags']['opcr']) {
                $info['ts']['packet']['adaption']['raw']['opcr'] = Helper::BigEndian2Int(substr($TSheader, $offset, 6)); $offset += 6;
            }
        }
 
        $info['error'][] = 'MPEG Transport Stream (.ts) parsing not enabled in this version of GetId3Core() ['.$this->getid3->version().']';
 
        return false;
 
    }
 
    public function TSscramblingControlLookup($raw)
    {
        $TSscramblingControlLookup = array(0x00=>'not scrambled', 0x01=>'reserved', 0x02=>'scrambled, even key', 0x03=>'scrambled, odd key');
 
        return (isset($TSscramblingControlLookup[$raw]) ? $TSscramblingControlLookup[$raw] : 'invalid');
    }
}