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