82 lines
3.8 KiB
PHP
82 lines
3.8 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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// see readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.ivf.php //
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// module for analyzing IVF audio-video files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
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exit;
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}
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class getid3_ivf extends getid3_handler
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{
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/**
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* @return bool
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*/
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public function Analyze() {
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$info = &$this->getid3->info;
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$info['fileformat'] = 'ivf';
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$info['video']['dataformat'] = 'ivf';
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$this->fseek($info['avdataoffset']);
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$IVFheader = $this->fread(32);
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if (substr($IVFheader, 0, 4) == 'DKIF') {
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// https://wiki.multimedia.cx/index.php/IVF
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$info['ivf']['header']['signature'] = substr($IVFheader, 0, 4);
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$info['ivf']['header']['version'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 4, 2)); // should be 0
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$info['ivf']['header']['headersize'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 6, 2));
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$info['ivf']['header']['fourcc'] = substr($IVFheader, 8, 4);
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$info['ivf']['header']['resolution_x'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 12, 2));
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$info['ivf']['header']['resolution_y'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 14, 2));
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$info['ivf']['header']['timebase_numerator'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 16, 4));
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$info['ivf']['header']['timebase_denominator'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 20, 4));
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$info['ivf']['header']['frame_count'] = getid3_lib::LittleEndian2Int(substr($IVFheader, 24, 4));
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//$info['ivf']['header']['reserved'] = substr($IVFheader, 28, 4);
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$info['ivf']['header']['frame_rate'] = (float) $info['ivf']['header']['timebase_numerator'] / $info['ivf']['header']['timebase_denominator'];
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if ($info['ivf']['header']['version'] > 0) {
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$this->warning('Expecting IVF header version 0, found version '.$info['ivf']['header']['version'].', results may not be accurate');
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}
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$info['video']['resolution_x'] = $info['ivf']['header']['resolution_x'];
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$info['video']['resolution_y'] = $info['ivf']['header']['resolution_y'];
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$info['video']['codec'] = $info['ivf']['header']['fourcc'];
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$info['ivf']['frame_count'] = 0;
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$timestamp = 0;
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while (!$this->feof()) {
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if ($frameheader = $this->fread(12)) {
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$framesize = getid3_lib::LittleEndian2Int(substr($frameheader, 0, 4)); // size of frame in bytes (not including the 12-byte header)
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$timestamp = getid3_lib::LittleEndian2Int(substr($frameheader, 4, 8)); // 64-bit presentation timestamp
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$this->fseek($framesize, SEEK_CUR);
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$info['ivf']['frame_count']++;
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}
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}
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if ($info['ivf']['frame_count']) {
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$info['playtime_seconds'] = $timestamp / 100000;
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$info['video']['frame_rate'] = (float) $info['ivf']['frame_count'] / $info['playtime_seconds'];
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}
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} else {
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$this->error('Expecting "DKIF" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($IVFheader, 0, 4)).'"');
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return false;
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}
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return true;
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}
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}
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