79 lines
5.5 KiB
PHP
79 lines
5.5 KiB
PHP
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<?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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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio-video.ts.php //
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// module for analyzing MPEG Transport Stream (.ts) files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_ts extends getid3_handler
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{
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public function Analyze() {
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$info = &$this->getid3->info;
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fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
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$TSheader = fread($this->getid3->fp, 19);
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$magic = "\x47";
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if (substr($TSheader, 0, 1) != $magic) {
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$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at '.$info['avdataoffset'].', found '.getid3_lib::PrintHexBytes(substr($TSheader, 0, 1)).' instead.';
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return false;
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}
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$info['fileformat'] = 'ts';
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// http://en.wikipedia.org/wiki/.ts
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$offset = 0;
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$info['ts']['packet']['sync'] = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 1)); $offset += 1;
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$pid_flags_raw = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 2)); $offset += 2;
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$SAC_raw = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 1)); $offset += 1;
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$info['ts']['packet']['flags']['transport_error_indicator'] = (bool) ($pid_flags_raw & 0x8000); // Set by demodulator if can't correct errors in the stream, to tell the demultiplexer that the packet has an uncorrectable error
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$info['ts']['packet']['flags']['payload_unit_start_indicator'] = (bool) ($pid_flags_raw & 0x4000); // 1 means start of PES data or PSI otherwise zero only.
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$info['ts']['packet']['flags']['transport_high_priority'] = (bool) ($pid_flags_raw & 0x2000); // 1 means higher priority than other packets with the same PID.
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$info['ts']['packet']['packet_id'] = ($pid_flags_raw & 0x1FFF) >> 0;
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$info['ts']['packet']['raw']['scrambling_control'] = ($SAC_raw & 0xC0) >> 6;
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$info['ts']['packet']['flags']['adaption_field_exists'] = (bool) ($SAC_raw & 0x20);
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$info['ts']['packet']['flags']['payload_exists'] = (bool) ($SAC_raw & 0x10);
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$info['ts']['packet']['continuity_counter'] = ($SAC_raw & 0x0F) >> 0; // Incremented only when a payload is present
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$info['ts']['packet']['scrambling_control'] = $this->TSscramblingControlLookup($info['ts']['packet']['raw']['scrambling_control']);
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if ($info['ts']['packet']['flags']['adaption_field_exists']) {
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$AdaptionField_raw = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 2)); $offset += 2;
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$info['ts']['packet']['adaption']['field_length'] = ($AdaptionField_raw & 0xFF00) >> 8; // Number of bytes in the adaptation field immediately following this byte
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$info['ts']['packet']['adaption']['flags']['discontinuity'] = (bool) ($AdaptionField_raw & 0x0080); // Set to 1 if current TS packet is in a discontinuity state with respect to either the continuity counter or the program clock reference
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$info['ts']['packet']['adaption']['flags']['random_access'] = (bool) ($AdaptionField_raw & 0x0040); // Set to 1 if the PES packet in this TS packet starts a video/audio sequence
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$info['ts']['packet']['adaption']['flags']['high_priority'] = (bool) ($AdaptionField_raw & 0x0020); // 1 = higher priority
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$info['ts']['packet']['adaption']['flags']['pcr'] = (bool) ($AdaptionField_raw & 0x0010); // 1 means adaptation field does contain a PCR field
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$info['ts']['packet']['adaption']['flags']['opcr'] = (bool) ($AdaptionField_raw & 0x0008); // 1 means adaptation field does contain an OPCR field
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$info['ts']['packet']['adaption']['flags']['splice_point'] = (bool) ($AdaptionField_raw & 0x0004); // 1 means presence of splice countdown field in adaptation field
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$info['ts']['packet']['adaption']['flags']['private_data'] = (bool) ($AdaptionField_raw & 0x0002); // 1 means presence of private data bytes in adaptation field
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$info['ts']['packet']['adaption']['flags']['extension'] = (bool) ($AdaptionField_raw & 0x0001); // 1 means presence of adaptation field extension
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if ($info['ts']['packet']['adaption']['flags']['pcr']) {
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$info['ts']['packet']['adaption']['raw']['pcr'] = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 6)); $offset += 6;
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}
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if ($info['ts']['packet']['adaption']['flags']['opcr']) {
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$info['ts']['packet']['adaption']['raw']['opcr'] = getid3_lib::BigEndian2Int(substr($TSheader, $offset, 6)); $offset += 6;
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}
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}
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$info['error'][] = 'MPEG Transport Stream (.ts) parsing not enabled in this version of getID3() ['.$this->getid3->version().']';
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return false;
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}
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public function TSscramblingControlLookup($raw) {
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$TSscramblingControlLookup = array(0x00=>'not scrambled', 0x01=>'reserved', 0x02=>'scrambled, even key', 0x03=>'scrambled, odd key');
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return (isset($TSscramblingControlLookup[$raw]) ? $TSscramblingControlLookup[$raw] : 'invalid');
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}
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}
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