vendor/james-heinrich/getid3/getid3/module.audio-video.ts.php

   1 <?php
   2 /////////////////////////////////////////////////////////////////
   3 /// getID3() by James Heinrich <info@getid3.org>               //
   4 //  available at http://getid3.sourceforge.net                 //
   5 //            or http://www.getid3.org                         //
   6 //          also https://github.com/JamesHeinrich/getID3       //
   7 /////////////////////////////////////////////////////////////////
   8 // See readme.txt for more details                             //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.audio-video.ts.php                                   //
  12 // module for analyzing MPEG Transport Stream (.ts) files      //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 class getid3_ts extends getid3_handler
  19 {
  20
  21         public function Analyze() {
  22                 $info = &$this->getid3->info;
  23
  24                 $this->fseek($info['avdataoffset']);
  25                 $TSheader = $this->fread(19);
  26                 $magic = "\x47";
  27                 if (substr($TSheader, 0, 1) != $magic) {
  28                         $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at '.$info['avdataoffset'].', found '.getid3_lib::PrintHexBytes(substr($TSheader, 0, 1)).' instead.');
  29                         return false;
  30                 }
  31                 $info['fileformat'] = 'ts';
  32
  33                 // http://en.wikipedia.org/wiki/.ts
  34
  35                 $offset = 0;
  36                 $info['ts']['packet']['sync'] = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 1)); $offset += 1;
  37                 $pid_flags_raw                = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 2)); $offset += 2;
  38                 $SAC_raw                      = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 1)); $offset += 1;
  39                 $info['ts']['packet']['flags']['transport_error_indicator']    =      (bool) ($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
  40                 $info['ts']['packet']['flags']['payload_unit_start_indicator'] =      (bool) ($pid_flags_raw & 0x4000);      // 1 means start of PES data or PSI otherwise zero only.
  41                 $info['ts']['packet']['flags']['transport_high_priority']      =      (bool) ($pid_flags_raw & 0x2000);      // 1 means higher priority than other packets with the same PID.
  42                 $info['ts']['packet']['packet_id']                             =             ($pid_flags_raw & 0x1FFF) >> 0;
  43
  44                 $info['ts']['packet']['raw']['scrambling_control']             =                   ($SAC_raw &   0xC0) >> 6;
  45                 $info['ts']['packet']['flags']['adaption_field_exists']        =      (bool)       ($SAC_raw &   0x20);
  46                 $info['ts']['packet']['flags']['payload_exists']               =      (bool)       ($SAC_raw &   0x10);
  47                 $info['ts']['packet']['continuity_counter']                    =                   ($SAC_raw &   0x0F) >> 0; // Incremented only when a payload is present
  48                 $info['ts']['packet']['scrambling_control']                    = $this->TSscramblingControlLookup($info['ts']['packet']['raw']['scrambling_control']);
  49
  50                 if ($info['ts']['packet']['flags']['adaption_field_exists']) {
  51                         $AdaptionField_raw        = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 2)); $offset += 2;
  52                         $info['ts']['packet']['adaption']['field_length']           =        ($AdaptionField_raw & 0xFF00) >> 8;  // Number of bytes in the adaptation field immediately following this byte
  53                         $info['ts']['packet']['adaption']['flags']['discontinuity'] = (bool) ($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
  54                         $info['ts']['packet']['adaption']['flags']['random_access'] = (bool) ($AdaptionField_raw & 0x0040);       // Set to 1 if the PES packet in this TS packet starts a video/audio sequence
  55                         $info['ts']['packet']['adaption']['flags']['high_priority'] = (bool) ($AdaptionField_raw & 0x0020);       // 1 = higher priority
  56                         $info['ts']['packet']['adaption']['flags']['pcr']           = (bool) ($AdaptionField_raw & 0x0010);       // 1 means adaptation field does contain a PCR field
  57                         $info['ts']['packet']['adaption']['flags']['opcr']          = (bool) ($AdaptionField_raw & 0x0008);       // 1 means adaptation field does contain an OPCR field
  58                         $info['ts']['packet']['adaption']['flags']['splice_point']  = (bool) ($AdaptionField_raw & 0x0004);       // 1 means presence of splice countdown field in adaptation field
  59                         $info['ts']['packet']['adaption']['flags']['private_data']  = (bool) ($AdaptionField_raw & 0x0002);       // 1 means presence of private data bytes in adaptation field
  60                         $info['ts']['packet']['adaption']['flags']['extension']     = (bool) ($AdaptionField_raw & 0x0001);       // 1 means presence of adaptation field extension
  61                         if ($info['ts']['packet']['adaption']['flags']['pcr']) {
  62                                 $info['ts']['packet']['adaption']['raw']['pcr'] = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 6)); $offset += 6;
  63                         }
  64                         if ($info['ts']['packet']['adaption']['flags']['opcr']) {
  65                                 $info['ts']['packet']['adaption']['raw']['opcr'] = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 6)); $offset += 6;
  66                         }
  67                 }
  68
  69 $this->error('MPEG Transport Stream (.ts) parsing not enabled in this version of getID3() ['.$this->getid3->version().']');
  70 return false;
  71
  72         }
  73
  74
  75         public function TSscramblingControlLookup($raw) {
  76                 $TSscramblingControlLookup = array(0x00=>'not scrambled', 0x01=>'reserved', 0x02=>'scrambled, even key', 0x03=>'scrambled, odd key');
  77                 return (isset($TSscramblingControlLookup[$raw]) ? $TSscramblingControlLookup[$raw] : 'invalid');
  78         }
  79 }