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/home/tahkoom/public_html/wp-includes/ID3/module.audio.ogg.php
<?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.ogg.php //
// module for analyzing Ogg Vorbis, OggFLAC and Speex files //
// dependencies: module.audio.flac.php //
// ///
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.flac.php', __FILE__, true);
class getid3_ogg extends getid3_handler
{
/**
* @link http://xiph.org/vorbis/doc/Vorbis_I_spec.html
*
* @return bool
*/
public function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'ogg';
// Warn about illegal tags - only vorbiscomments are allowed
if (isset($info['id3v2'])) {
$this->warning('Illegal ID3v2 tag present.');
}
if (isset($info['id3v1'])) {
$this->warning('Illegal ID3v1 tag present.');
}
if (isset($info['ape'])) {
$this->warning('Illegal APE tag present.');
}
// Page 1 - Stream Header
$this->fseek($info['avdataoffset']);
$oggpageinfo = $this->ParseOggPageHeader();
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
if ($this->ftell() >= $this->getid3->fread_buffer_size()) {
$this->error('Could not find start of Ogg page in the first '.$this->getid3->fread_buffer_size().' bytes (this might not be an Ogg-Vorbis file?)');
unset($info['fileformat']);
unset($info['ogg']);
return false;
}
$filedata = $this->fread($oggpageinfo['page_length']);
$filedataoffset = 0;
if (substr($filedata, 0, 4) == 'fLaC') {
$info['audio']['dataformat'] = 'flac';
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['lossless'] = true;
} elseif (substr($filedata, 1, 6) == 'vorbis') {
$this->ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);
} elseif (substr($filedata, 0, 8) == 'OpusHead') {
if ($this->ParseOpusPageHeader($filedata, $filedataoffset, $oggpageinfo) === false) {
return false;
}
} elseif (substr($filedata, 0, 8) == 'Speex ') {
// http://www.speex.org/manual/node10.html
$info['audio']['dataformat'] = 'speex';
$info['mime_type'] = 'audio/speex';
$info['audio']['bitrate_mode'] = 'abr';
$info['audio']['lossless'] = false;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_string'] = substr($filedata, $filedataoffset, 8); // hard-coded to 'Speex '
$filedataoffset += 8;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version'] = substr($filedata, $filedataoffset, 20);
$filedataoffset += 20;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version_id'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['header_size'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode_bitstream_version'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['bitrate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['framesize'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['frames_per_packet'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['extra_headers'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved1'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved2'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['speex']['speex_version'] = trim($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']);
$info['speex']['sample_rate'] = $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'];
$info['speex']['channels'] = $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'];
$info['speex']['vbr'] = (bool) $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'];
$info['speex']['band_type'] = $this->SpeexBandModeLookup($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']);
$info['audio']['sample_rate'] = $info['speex']['sample_rate'];
$info['audio']['channels'] = $info['speex']['channels'];
if ($info['speex']['vbr']) {
$info['audio']['bitrate_mode'] = 'vbr';
}
} elseif (substr($filedata, 0, 7) == "\x80".'theora') {
// http://www.theora.org/doc/Theora.pdf (section 6.2)
$info['ogg']['pageheader']['theora']['theora_magic'] = substr($filedata, $filedataoffset, 7); // hard-coded to "\x80.'theora'
$filedataoffset += 7;
$info['ogg']['pageheader']['theora']['version_major'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader']['theora']['version_minor'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader']['theora']['version_revision'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader']['theora']['frame_width_macroblocks'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 2));
$filedataoffset += 2;
$info['ogg']['pageheader']['theora']['frame_height_macroblocks'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 2));
$filedataoffset += 2;
$info['ogg']['pageheader']['theora']['resolution_x'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 3));
$filedataoffset += 3;
$info['ogg']['pageheader']['theora']['resolution_y'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 3));
$filedataoffset += 3;
$info['ogg']['pageheader']['theora']['picture_offset_x'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader']['theora']['picture_offset_y'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader']['theora']['frame_rate_numerator'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader']['theora']['frame_rate_denominator'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['pageheader']['theora']['pixel_aspect_numerator'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 3));
$filedataoffset += 3;
$info['ogg']['pageheader']['theora']['pixel_aspect_denominator'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 3));
$filedataoffset += 3;
$info['ogg']['pageheader']['theora']['color_space_id'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader']['theora']['nominal_bitrate'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 3));
$filedataoffset += 3;
$info['ogg']['pageheader']['theora']['flags'] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset, 2));
$filedataoffset += 2;
$info['ogg']['pageheader']['theora']['quality'] = ($info['ogg']['pageheader']['theora']['flags'] & 0xFC00) >> 10;
$info['ogg']['pageheader']['theora']['kfg_shift'] = ($info['ogg']['pageheader']['theora']['flags'] & 0x03E0) >> 5;
$info['ogg']['pageheader']['theora']['pixel_format_id'] = ($info['ogg']['pageheader']['theora']['flags'] & 0x0018) >> 3;
$info['ogg']['pageheader']['theora']['reserved'] = ($info['ogg']['pageheader']['theora']['flags'] & 0x0007) >> 0; // should be 0
$info['ogg']['pageheader']['theora']['color_space'] = self::TheoraColorSpace($info['ogg']['pageheader']['theora']['color_space_id']);
$info['ogg']['pageheader']['theora']['pixel_format'] = self::TheoraPixelFormat($info['ogg']['pageheader']['theora']['pixel_format_id']);
$info['video']['dataformat'] = 'theora';
$info['mime_type'] = 'video/ogg';
//$info['audio']['bitrate_mode'] = 'abr';
//$info['audio']['lossless'] = false;
$info['video']['resolution_x'] = $info['ogg']['pageheader']['theora']['resolution_x'];
$info['video']['resolution_y'] = $info['ogg']['pageheader']['theora']['resolution_y'];
if ($info['ogg']['pageheader']['theora']['frame_rate_denominator'] > 0) {
$info['video']['frame_rate'] = (float) $info['ogg']['pageheader']['theora']['frame_rate_numerator'] / $info['ogg']['pageheader']['theora']['frame_rate_denominator'];
}
if ($info['ogg']['pageheader']['theora']['pixel_aspect_denominator'] > 0) {
$info['video']['pixel_aspect_ratio'] = (float) $info['ogg']['pageheader']['theora']['pixel_aspect_numerator'] / $info['ogg']['pageheader']['theora']['pixel_aspect_denominator'];
}
$this->warning('Ogg Theora (v3) not fully supported in this version of getID3 ['.$this->getid3->version().'] -- bitrate, playtime and all audio data are currently unavailable');
} elseif (substr($filedata, 0, 8) == "fishead\x00") {
// Ogg Skeleton version 3.0 Format Specification
// http://xiph.org/ogg/doc/skeleton.html
$filedataoffset += 8;
$info['ogg']['skeleton']['fishead']['raw']['version_major'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 2));
$filedataoffset += 2;
$info['ogg']['skeleton']['fishead']['raw']['version_minor'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 2));
$filedataoffset += 2;
$info['ogg']['skeleton']['fishead']['raw']['presentationtime_numerator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fishead']['raw']['presentationtime_denominator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fishead']['raw']['basetime_numerator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fishead']['raw']['basetime_denominator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fishead']['raw']['utc'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 20));
$filedataoffset += 20;
$info['ogg']['skeleton']['fishead']['version'] = $info['ogg']['skeleton']['fishead']['raw']['version_major'].'.'.$info['ogg']['skeleton']['fishead']['raw']['version_minor'];
$info['ogg']['skeleton']['fishead']['presentationtime'] = getid3_lib::SafeDiv($info['ogg']['skeleton']['fishead']['raw']['presentationtime_numerator'], $info['ogg']['skeleton']['fishead']['raw']['presentationtime_denominator']);
$info['ogg']['skeleton']['fishead']['basetime'] = getid3_lib::SafeDiv($info['ogg']['skeleton']['fishead']['raw']['basetime_numerator'], $info['ogg']['skeleton']['fishead']['raw']['basetime_denominator']);
$info['ogg']['skeleton']['fishead']['utc'] = $info['ogg']['skeleton']['fishead']['raw']['utc'];
$counter = 0;
do {
$oggpageinfo = $this->ParseOggPageHeader();
$info['ogg']['pageheader'][$oggpageinfo['page_seqno'].'.'.$counter++] = $oggpageinfo;
$filedata = $this->fread($oggpageinfo['page_length']);
$this->fseek($oggpageinfo['page_end_offset']);
if (substr($filedata, 0, 8) == "fisbone\x00") {
$filedataoffset = 8;
$info['ogg']['skeleton']['fisbone']['raw']['message_header_offset'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['skeleton']['fisbone']['raw']['serial_number'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['skeleton']['fisbone']['raw']['number_header_packets'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['skeleton']['fisbone']['raw']['granulerate_numerator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fisbone']['raw']['granulerate_denominator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fisbone']['raw']['basegranule'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$info['ogg']['skeleton']['fisbone']['raw']['preroll'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['skeleton']['fisbone']['raw']['granuleshift'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['skeleton']['fisbone']['raw']['padding'] = substr($filedata, $filedataoffset, 3);
$filedataoffset += 3;
} elseif (substr($filedata, 1, 6) == 'theora') {
$info['video']['dataformat'] = 'theora1';
$this->error('Ogg Theora (v1) not correctly handled in this version of getID3 ['.$this->getid3->version().']');
//break;
} elseif (substr($filedata, 1, 6) == 'vorbis') {
$this->ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);
} else {
$this->error('unexpected');
//break;
}
//} while ($oggpageinfo['page_seqno'] == 0);
} while (($oggpageinfo['page_seqno'] == 0) && (substr($filedata, 0, 8) != "fisbone\x00"));
$this->fseek($oggpageinfo['page_start_offset']);
$this->error('Ogg Skeleton not correctly handled in this version of getID3 ['.$this->getid3->version().']');
//return false;
} elseif (substr($filedata, 0, 5) == "\x7F".'FLAC') {
// https://xiph.org/flac/ogg_mapping.html
$info['audio']['dataformat'] = 'flac';
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['lossless'] = true;
$info['ogg']['flac']['header']['version_major'] = ord(substr($filedata, 5, 1));
$info['ogg']['flac']['header']['version_minor'] = ord(substr($filedata, 6, 1));
$info['ogg']['flac']['header']['header_packets'] = getid3_lib::BigEndian2Int(substr($filedata, 7, 2)) + 1; // "A two-byte, big-endian binary number signifying the number of header (non-audio) packets, not including this one. This number may be zero (0x0000) to signify 'unknown' but be aware that some decoders may not be able to handle such streams."
$info['ogg']['flac']['header']['magic'] = substr($filedata, 9, 4);
if ($info['ogg']['flac']['header']['magic'] != 'fLaC') {
$this->error('Ogg-FLAC expecting "fLaC", found "'.$info['ogg']['flac']['header']['magic'].'" ('.trim(getid3_lib::PrintHexBytes($info['ogg']['flac']['header']['magic'])).')');
return false;
}
$info['ogg']['flac']['header']['STREAMINFO_bytes'] = getid3_lib::BigEndian2Int(substr($filedata, 13, 4));
$info['flac']['STREAMINFO'] = getid3_flac::parseSTREAMINFOdata(substr($filedata, 17, 34));
if (!empty($info['flac']['STREAMINFO']['sample_rate'])) {
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['sample_rate'] = $info['flac']['STREAMINFO']['sample_rate'];
$info['audio']['channels'] = $info['flac']['STREAMINFO']['channels'];
$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
$info['playtime_seconds'] = getid3_lib::SafeDiv($info['flac']['STREAMINFO']['samples_stream'], $info['flac']['STREAMINFO']['sample_rate']);
}
} else {
$this->error('Expecting one of "vorbis", "Speex", "OpusHead", "vorbis", "fishhead", "theora", "fLaC" identifier strings, found "'.substr($filedata, 0, 8).'"');
unset($info['ogg']);
unset($info['mime_type']);
return false;
}
// Page 2 - Comment Header
$oggpageinfo = $this->ParseOggPageHeader();
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
switch ($info['audio']['dataformat']) {
case 'vorbis':
$filedata = $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, 0, 1));
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, 1, 6); // hard-coded to 'vorbis'
$this->ParseVorbisComments();
break;
case 'flac':
$flac = new getid3_flac($this->getid3);
if (!$flac->parseMETAdata()) {
$this->error('Failed to parse FLAC headers');
return false;
}
unset($flac);
break;
case 'speex':
$this->fseek($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length'], SEEK_CUR);
$this->ParseVorbisComments();
break;
case 'opus':
$filedata = $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, 0, 8); // hard-coded to 'OpusTags'
if(substr($filedata, 0, 8) != 'OpusTags') {
$this->error('Expected "OpusTags" as header but got "'.substr($filedata, 0, 8).'"');
return false;
}
$this->ParseVorbisComments();
break;
}
// Last Page - Number of Samples
if (!getid3_lib::intValueSupported($info['avdataend'])) {
$this->warning('Unable to parse Ogg end chunk file (PHP does not support file operations beyond '.round(PHP_INT_MAX / 1073741824).'GB)');
} else {
$this->fseek(max($info['avdataend'] - $this->getid3->fread_buffer_size(), 0));
$LastChunkOfOgg = strrev($this->fread($this->getid3->fread_buffer_size()));
if ($LastOggSpostion = strpos($LastChunkOfOgg, 'SggO')) {
$this->fseek($info['avdataend'] - ($LastOggSpostion + strlen('SggO')));
$info['avdataend'] = $this->ftell();
$info['ogg']['pageheader']['eos'] = $this->ParseOggPageHeader();
$info['ogg']['samples'] = $info['ogg']['pageheader']['eos']['pcm_abs_position'];
if ($info['ogg']['samples'] == 0) {
$this->error('Corrupt Ogg file: eos.number of samples == zero');
return false;
}
if (!empty($info['audio']['sample_rate'])) {
$info['ogg']['bitrate_average'] = (($info['avdataend'] - $info['avdataoffset']) * 8) * $info['audio']['sample_rate'] / $info['ogg']['samples'];
}
}
}
if (!empty($info['ogg']['bitrate_average'])) {
$info['audio']['bitrate'] = $info['ogg']['bitrate_average'];
} elseif (!empty($info['ogg']['bitrate_nominal'])) {
$info['audio']['bitrate'] = $info['ogg']['bitrate_nominal'];
} elseif (!empty($info['ogg']['bitrate_min']) && !empty($info['ogg']['bitrate_max'])) {
$info['audio']['bitrate'] = ($info['ogg']['bitrate_min'] + $info['ogg']['bitrate_max']) / 2;
}
if (isset($info['audio']['bitrate']) && !isset($info['playtime_seconds'])) {
if ($info['audio']['bitrate'] == 0) {
$this->error('Corrupt Ogg file: bitrate_audio == zero');
return false;
}
$info['playtime_seconds'] = (float) ((($info['avdataend'] - $info['avdataoffset']) * 8) / $info['audio']['bitrate']);
}
if (isset($info['ogg']['vendor'])) {
$info['audio']['encoder'] = preg_replace('/^Encoded with /', '', $info['ogg']['vendor']);
// Vorbis only
if ($info['audio']['dataformat'] == 'vorbis') {
// Vorbis 1.0 starts with Xiph.Org
if (preg_match('/^Xiph.Org/', $info['audio']['encoder'])) {
if ($info['audio']['bitrate_mode'] == 'abr') {
// Set -b 128 on abr files
$info['audio']['encoder_options'] = '-b '.round($info['ogg']['bitrate_nominal'] / 1000);
} elseif (($info['audio']['bitrate_mode'] == 'vbr') && ($info['audio']['channels'] == 2) && ($info['audio']['sample_rate'] >= 44100) && ($info['audio']['sample_rate'] <= 48000)) {
// Set -q N on vbr files
$info['audio']['encoder_options'] = '-q '.$this->get_quality_from_nominal_bitrate($info['ogg']['bitrate_nominal']);
}
}
if (empty($info['audio']['encoder_options']) && !empty($info['ogg']['bitrate_nominal'])) {
$info['audio']['encoder_options'] = 'Nominal bitrate: '.intval(round($info['ogg']['bitrate_nominal'] / 1000)).'kbps';
}
}
}
return true;
}
/**
* @param string $filedata
* @param int $filedataoffset
* @param array $oggpageinfo
*
* @return bool
*/
public function ParseVorbisPageHeader(&$filedata, &$filedataoffset, &$oggpageinfo) {
$info = &$this->getid3->info;
$info['audio']['dataformat'] = 'vorbis';
$info['audio']['lossless'] = false;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, $filedataoffset, 6); // hard-coded to 'vorbis'
$filedataoffset += 6;
$info['ogg']['bitstreamversion'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['numberofchannels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$info['audio']['channels'] = $info['ogg']['numberofchannels'];
$info['ogg']['samplerate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
if ($info['ogg']['samplerate'] == 0) {
$this->error('Corrupt Ogg file: sample rate == zero');
return false;
}
$info['audio']['sample_rate'] = $info['ogg']['samplerate'];
$info['ogg']['samples'] = 0; // filled in later
$info['ogg']['bitrate_average'] = 0; // filled in later
$info['ogg']['bitrate_max'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['bitrate_nominal'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['bitrate_min'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$info['ogg']['blocksize_small'] = pow(2, getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0x0F);
$info['ogg']['blocksize_large'] = pow(2, (getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xF0) >> 4);
$info['ogg']['stop_bit'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)); // must be 1, marks end of packet
$info['audio']['bitrate_mode'] = 'vbr'; // overridden if actually abr
if ($info['ogg']['bitrate_max'] == 0xFFFFFFFF) {
unset($info['ogg']['bitrate_max']);
$info['audio']['bitrate_mode'] = 'abr';
}
if ($info['ogg']['bitrate_nominal'] == 0xFFFFFFFF) {
unset($info['ogg']['bitrate_nominal']);
}
if ($info['ogg']['bitrate_min'] == 0xFFFFFFFF) {
unset($info['ogg']['bitrate_min']);
$info['audio']['bitrate_mode'] = 'abr';
}
return true;
}
/**
* @link http://tools.ietf.org/html/draft-ietf-codec-oggopus-03
*
* @param string $filedata
* @param int $filedataoffset
* @param array $oggpageinfo
*
* @return bool
*/
public function ParseOpusPageHeader(&$filedata, &$filedataoffset, &$oggpageinfo) {
$info = &$this->getid3->info;
$info['audio']['dataformat'] = 'opus';
$info['mime_type'] = 'audio/ogg; codecs=opus';
/** @todo find a usable way to detect abr (vbr that is padded to be abr) */
$info['audio']['bitrate_mode'] = 'vbr';
$info['audio']['lossless'] = false;
$info['ogg']['pageheader']['opus']['opus_magic'] = substr($filedata, $filedataoffset, 8); // hard-coded to 'OpusHead'
$filedataoffset += 8;
$info['ogg']['pageheader']['opus']['version'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
if ($info['ogg']['pageheader']['opus']['version'] < 1 || $info['ogg']['pageheader']['opus']['version'] > 15) {
$this->error('Unknown opus version number (only accepting 1-15)');
return false;
}
$info['ogg']['pageheader']['opus']['out_channel_count'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
if ($info['ogg']['pageheader']['opus']['out_channel_count'] == 0) {
$this->error('Invalid channel count in opus header (must not be zero)');
return false;
}
$info['ogg']['pageheader']['opus']['pre_skip'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 2));
$filedataoffset += 2;
$info['ogg']['pageheader']['opus']['input_sample_rate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
//$info['ogg']['pageheader']['opus']['output_gain'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 2));
//$filedataoffset += 2;
//$info['ogg']['pageheader']['opus']['channel_mapping_family'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
//$filedataoffset += 1;
$info['opus']['opus_version'] = $info['ogg']['pageheader']['opus']['version'];
$info['opus']['sample_rate_input'] = $info['ogg']['pageheader']['opus']['input_sample_rate'];
$info['opus']['out_channel_count'] = $info['ogg']['pageheader']['opus']['out_channel_count'];
$info['audio']['channels'] = $info['opus']['out_channel_count'];
$info['audio']['sample_rate_input'] = $info['opus']['sample_rate_input'];
$info['audio']['sample_rate'] = 48000; // "All Opus audio is coded at 48 kHz, and should also be decoded at 48 kHz for playback (unless the target hardware does not support this sampling rate). However, this field may be used to resample the audio back to the original sampling rate, for example, when saving the output to a file." -- https://mf4.xiph.org/jenkins/view/opus/job/opusfile-unix/ws/doc/html/structOpusHead.html
return true;
}
/**
* @return array|false
*/
public function ParseOggPageHeader() {
// http://xiph.org/ogg/vorbis/doc/framing.html
$oggheader = array();
$oggheader['page_start_offset'] = $this->ftell(); // where we started from in the file
$filedata = $this->fread($this->getid3->fread_buffer_size());
$filedataoffset = 0;
while (substr($filedata, $filedataoffset++, 4) != 'OggS') {
if (($this->ftell() - $oggheader['page_start_offset']) >= $this->getid3->fread_buffer_size()) {
// should be found before here
return false;
}
if (($filedataoffset + 28) > strlen($filedata)) {
if ($this->feof() || (($filedata .= $this->fread($this->getid3->fread_buffer_size())) === '')) {
// get some more data, unless eof, in which case fail
return false;
}
}
}
$filedataoffset += strlen('OggS') - 1; // page, delimited by 'OggS'
$oggheader['stream_structver'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$oggheader['flags_raw'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$oggheader['flags']['fresh'] = (bool) ($oggheader['flags_raw'] & 0x01); // fresh packet
$oggheader['flags']['bos'] = (bool) ($oggheader['flags_raw'] & 0x02); // first page of logical bitstream (bos)
$oggheader['flags']['eos'] = (bool) ($oggheader['flags_raw'] & 0x04); // last page of logical bitstream (eos)
$oggheader['pcm_abs_position'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
$filedataoffset += 8;
$oggheader['stream_serialno'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$oggheader['page_seqno'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$oggheader['page_checksum'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$oggheader['page_segments'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$oggheader['page_length'] = 0;
for ($i = 0; $i < $oggheader['page_segments']; $i++) {
$oggheader['segment_table'][$i] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$oggheader['page_length'] += $oggheader['segment_table'][$i];
}
$oggheader['header_end_offset'] = $oggheader['page_start_offset'] + $filedataoffset;
$oggheader['page_end_offset'] = $oggheader['header_end_offset'] + $oggheader['page_length'];
$this->fseek($oggheader['header_end_offset']);
return $oggheader;
}
/**
* @link http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-810005
*
* @return bool
*/
public function ParseVorbisComments() {
$info = &$this->getid3->info;
$OriginalOffset = $this->ftell();
$commentdata = null;
$commentdataoffset = 0;
$VorbisCommentPage = 1;
$CommentStartOffset = 0;
switch ($info['audio']['dataformat']) {
case 'vorbis':
case 'speex':
case 'opus':
$CommentStartOffset = $info['ogg']['pageheader'][$VorbisCommentPage]['page_start_offset']; // Second Ogg page, after header block
$this->fseek($CommentStartOffset);
$commentdataoffset = 27 + $info['ogg']['pageheader'][$VorbisCommentPage]['page_segments'];
$commentdata = $this->fread(self::OggPageSegmentLength($info['ogg']['pageheader'][$VorbisCommentPage], 1) + $commentdataoffset);
if ($info['audio']['dataformat'] == 'vorbis') {
$commentdataoffset += (strlen('vorbis') + 1);
}
else if ($info['audio']['dataformat'] == 'opus') {
$commentdataoffset += strlen('OpusTags');
}
break;
case 'flac':
$CommentStartOffset = $info['flac']['VORBIS_COMMENT']['raw']['offset'] + 4;
$this->fseek($CommentStartOffset);
$commentdata = $this->fread($info['flac']['VORBIS_COMMENT']['raw']['block_length']);
break;
default:
return false;
}
$VendorSize = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
$commentdataoffset += 4;
$info['ogg']['vendor'] = substr($commentdata, $commentdataoffset, $VendorSize);
$commentdataoffset += $VendorSize;
$CommentsCount = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
$commentdataoffset += 4;
$info['avdataoffset'] = $CommentStartOffset + $commentdataoffset;
$basicfields = array('TITLE', 'ARTIST', 'ALBUM', 'TRACKNUMBER', 'GENRE', 'DATE', 'DESCRIPTION', 'COMMENT');
$ThisFileInfo_ogg_comments_raw = &$info['ogg']['comments_raw'];
for ($i = 0; $i < $CommentsCount; $i++) {
if ($i >= 10000) {
// https://github.com/owncloud/music/issues/212#issuecomment-43082336
$this->warning('Unexpectedly large number ('.$CommentsCount.') of Ogg comments - breaking after reading '.$i.' comments');
break;
}
$ThisFileInfo_ogg_comments_raw[$i]['dataoffset'] = $CommentStartOffset + $commentdataoffset;
if ($this->ftell() < ($ThisFileInfo_ogg_comments_raw[$i]['dataoffset'] + 4)) {
if ($oggpageinfo = $this->ParseOggPageHeader()) {
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
$VorbisCommentPage++;
// First, save what we haven't read yet
$AsYetUnusedData = substr($commentdata, $commentdataoffset);
// Then take that data off the end
$commentdata = substr($commentdata, 0, $commentdataoffset);
// Add [headerlength] bytes of dummy data for the Ogg Page Header, just to keep absolute offsets correct
$commentdata .= str_repeat("\x00", 27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
$commentdataoffset += (27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
// Finally, stick the unused data back on the end
$commentdata .= $AsYetUnusedData;
//$commentdata .= $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
$commentdata .= $this->fread($this->OggPageSegmentLength($info['ogg']['pageheader'][$VorbisCommentPage], 1));
}
}
$ThisFileInfo_ogg_comments_raw[$i]['size'] = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
// replace avdataoffset with position just after the last vorbiscomment
$info['avdataoffset'] = $ThisFileInfo_ogg_comments_raw[$i]['dataoffset'] + $ThisFileInfo_ogg_comments_raw[$i]['size'] + 4;
$commentdataoffset += 4;
while ((strlen($commentdata) - $commentdataoffset) < $ThisFileInfo_ogg_comments_raw[$i]['size']) {
if (($ThisFileInfo_ogg_comments_raw[$i]['size'] > $info['avdataend']) || ($ThisFileInfo_ogg_comments_raw[$i]['size'] < 0)) {
$this->warning('Invalid Ogg comment size (comment #'.$i.', claims to be '.number_format($ThisFileInfo_ogg_comments_raw[$i]['size']).' bytes) - aborting reading comments');
break 2;
}
$VorbisCommentPage++;
if ($oggpageinfo = $this->ParseOggPageHeader()) {
$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
// First, save what we haven't read yet
$AsYetUnusedData = substr($commentdata, $commentdataoffset);
// Then take that data off the end
$commentdata = substr($commentdata, 0, $commentdataoffset);
// Add [headerlength] bytes of dummy data for the Ogg Page Header, just to keep absolute offsets correct
$commentdata .= str_repeat("\x00", 27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
$commentdataoffset += (27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
// Finally, stick the unused data back on the end
$commentdata .= $AsYetUnusedData;
//$commentdata .= $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
if (!isset($info['ogg']['pageheader'][$VorbisCommentPage])) {
$this->warning('undefined Vorbis Comment page "'.$VorbisCommentPage.'" at offset '.$this->ftell());
break;
}
$readlength = self::OggPageSegmentLength($info['ogg']['pageheader'][$VorbisCommentPage], 1);
if ($readlength <= 0) {
$this->warning('invalid length Vorbis Comment page "'.$VorbisCommentPage.'" at offset '.$this->ftell());
break;
}
$commentdata .= $this->fread($readlength);
//$filebaseoffset += $oggpageinfo['header_end_offset'] - $oggpageinfo['page_start_offset'];
} else {
$this->warning('failed to ParseOggPageHeader() at offset '.$this->ftell());
break;
}
}
$ThisFileInfo_ogg_comments_raw[$i]['offset'] = $commentdataoffset;
$commentstring = substr($commentdata, $commentdataoffset, $ThisFileInfo_ogg_comments_raw[$i]['size']);
$commentdataoffset += $ThisFileInfo_ogg_comments_raw[$i]['size'];
if (!$commentstring) {
// no comment?
$this->warning('Blank Ogg comment ['.$i.']');
} elseif (strstr($commentstring, '=')) {
$commentexploded = explode('=', $commentstring, 2);
$ThisFileInfo_ogg_comments_raw[$i]['key'] = strtoupper($commentexploded[0]);
$ThisFileInfo_ogg_comments_raw[$i]['value'] = (isset($commentexploded[1]) ? $commentexploded[1] : '');
if ($ThisFileInfo_ogg_comments_raw[$i]['key'] == 'METADATA_BLOCK_PICTURE') {
// http://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE
// The unencoded format is that of the FLAC picture block. The fields are stored in big endian order as in FLAC, picture data is stored according to the relevant standard.
// http://flac.sourceforge.net/format.html#metadata_block_picture
$flac = new getid3_flac($this->getid3);
$flac->setStringMode(base64_decode($ThisFileInfo_ogg_comments_raw[$i]['value']));
$flac->parsePICTURE();
$info['ogg']['comments']['picture'][] = $flac->getid3->info['flac']['PICTURE'][0];
unset($flac);
} elseif ($ThisFileInfo_ogg_comments_raw[$i]['key'] == 'COVERART') {
$data = base64_decode($ThisFileInfo_ogg_comments_raw[$i]['value']);
$this->notice('Found deprecated COVERART tag, it should be replaced in honor of METADATA_BLOCK_PICTURE structure');
/** @todo use 'coverartmime' where available */
$imageinfo = getid3_lib::GetDataImageSize($data);
if ($imageinfo === false || !isset($imageinfo['mime'])) {
$this->warning('COVERART vorbiscomment tag contains invalid image');
continue;
}
$ogg = new self($this->getid3);
$ogg->setStringMode($data);
$info['ogg']['comments']['picture'][] = array(
'image_mime' => $imageinfo['mime'],
'datalength' => strlen($data),
'picturetype' => 'cover art',
'image_height' => $imageinfo['height'],
'image_width' => $imageinfo['width'],
'data' => $ogg->saveAttachment('coverart', 0, strlen($data), $imageinfo['mime']),
);
unset($ogg);
} else {
$info['ogg']['comments'][strtolower($ThisFileInfo_ogg_comments_raw[$i]['key'])][] = $ThisFileInfo_ogg_comments_raw[$i]['value'];
}
} else {
$this->warning('[known problem with CDex >= v1.40, < v1.50b7] Invalid Ogg comment name/value pair ['.$i.']: '.$commentstring);
}
unset($ThisFileInfo_ogg_comments_raw[$i]);
}
unset($ThisFileInfo_ogg_comments_raw);
// Replay Gain Adjustment
// http://privatewww.essex.ac.uk/~djmrob/replaygain/
if (isset($info['ogg']['comments']) && is_array($info['ogg']['comments'])) {
foreach ($info['ogg']['comments'] as $index => $commentvalue) {
switch ($index) {
case 'rg_audiophile':
case 'replaygain_album_gain':
$info['replay_gain']['album']['adjustment'] = (double) $commentvalue[0];
unset($info['ogg']['comments'][$index]);
break;
case 'rg_radio':
case 'replaygain_track_gain':
$info['replay_gain']['track']['adjustment'] = (double) $commentvalue[0];
unset($info['ogg']['comments'][$index]);
break;
case 'replaygain_album_peak':
$info['replay_gain']['album']['peak'] = (double) $commentvalue[0];
unset($info['ogg']['comments'][$index]);
break;
case 'rg_peak':
case 'replaygain_track_peak':
$info['replay_gain']['track']['peak'] = (double) $commentvalue[0];
unset($info['ogg']['comments'][$index]);
break;
case 'replaygain_reference_loudness':
$info['replay_gain']['reference_volume'] = (double) $commentvalue[0];
unset($info['ogg']['comments'][$index]);
break;
default:
// do nothing
break;
}
}
}
$this->fseek($OriginalOffset);
return true;
}
/**
* @param int $mode
*
* @return string|null
*/
public static function SpeexBandModeLookup($mode) {
static $SpeexBandModeLookup = array();
if (empty($SpeexBandModeLookup)) {
$SpeexBandModeLookup[0] = 'narrow';
$SpeexBandModeLookup[1] = 'wide';
$SpeexBandModeLookup[2] = 'ultra-wide';
}
return (isset($SpeexBandModeLookup[$mode]) ? $SpeexBandModeLookup[$mode] : null);
}
/**
* @param array $OggInfoArray
* @param int $SegmentNumber
*
* @return int
*/
public static function OggPageSegmentLength($OggInfoArray, $SegmentNumber=1) {
$segmentlength = 0;
for ($i = 0; $i < $SegmentNumber; $i++) {
$segmentlength = 0;
foreach ($OggInfoArray['segment_table'] as $key => $value) {
$segmentlength += $value;
if ($value < 255) {
break;
}
}
}
return $segmentlength;
}
/**
* @param int $nominal_bitrate
*
* @return float
*/
public static function get_quality_from_nominal_bitrate($nominal_bitrate) {
// decrease precision
$nominal_bitrate = $nominal_bitrate / 1000;
if ($nominal_bitrate < 128) {
// q-1 to q4
$qval = ($nominal_bitrate - 64) / 16;
} elseif ($nominal_bitrate < 256) {
// q4 to q8
$qval = $nominal_bitrate / 32;
} elseif ($nominal_bitrate < 320) {
// q8 to q9
$qval = ($nominal_bitrate + 256) / 64;
} else {
// q9 to q10
$qval = ($nominal_bitrate + 1300) / 180;
}
//return $qval; // 5.031324
//return intval($qval); // 5
return round($qval, 1); // 5 or 4.9
}
/**
* @param int $colorspace_id
*
* @return string|null
*/
public static function TheoraColorSpace($colorspace_id) {
// http://www.theora.org/doc/Theora.pdf (table 6.3)
static $TheoraColorSpaceLookup = array();
if (empty($TheoraColorSpaceLookup)) {
$TheoraColorSpaceLookup[0] = 'Undefined';
$TheoraColorSpaceLookup[1] = 'Rec. 470M';
$TheoraColorSpaceLookup[2] = 'Rec. 470BG';
$TheoraColorSpaceLookup[3] = 'Reserved';
}
return (isset($TheoraColorSpaceLookup[$colorspace_id]) ? $TheoraColorSpaceLookup[$colorspace_id] : null);
}
/**
* @param int $pixelformat_id
*
* @return string|null
*/
public static function TheoraPixelFormat($pixelformat_id) {
// http://www.theora.org/doc/Theora.pdf (table 6.4)
static $TheoraPixelFormatLookup = array();
if (empty($TheoraPixelFormatLookup)) {
$TheoraPixelFormatLookup[0] = '4:2:0';
$TheoraPixelFormatLookup[1] = 'Reserved';
$TheoraPixelFormatLookup[2] = '4:2:2';
$TheoraPixelFormatLookup[3] = '4:4:4';
}
return (isset($TheoraPixelFormatLookup[$pixelformat_id]) ? $TheoraPixelFormatLookup[$pixelformat_id] : null);
}
}
عالم تحت المجهر الرقمي…عندما تكتب، هناك من يتذكر ويراقب – tahkoom.com
كتبت ميرنا أشرف
ظاهرة تثير جدل بدأ يلاحظها مستخدمي تطبيق “شات جي بي تي” وهي أن التطبيق ينادي المستخدمين بأسمائهم الاولى اثناء المحادثات وتلقي المعلومات منه رغم انهم لم يخبروه بها مسبقا، نظرا لما قالته احد لمستخدمين لتطبيق الذكاء الاصطناعي “شات جي بي تي”، انها كانت تسأله عن معلومات بشكل طبيعي دون ان تذكر أي أسماء .
فوجئت بأن التطبيق رد عليها مستخدما اسمها واسم صديقتها، رغم أنها لم تصرح عنهما مطلقا في اي محادثه سابقه من محادثاتها. هذا الموقف أثار جدل حول مدي قدرة الذكاء الاصطناعي على الوصول إلى معلومات شخصية وخفيه، مما يثير مخاوف تعلق بالخصوصية واستخدام الذاكرة .
إن صنع نظام آلي قادر على تكوين ذاكرة اجتماعية عن البشر لم يعد مجرد تحد تقني… بل أصبح واقعًا مخيفًا، لأن ليس محور الكلام هنا عن مجرد جهاز بيخزن بيانات، نحن نتحدث عن آلة بتراقب، وبتحلل، وبتتعلم بصمت؛ الأهم من ذلك هو حقيقة أنه عندما نتحدث الي ذلك النظام ويرد على المستخدم بردود غير متوقعه وكأنه يعرفه ويتتبعه. هذه عملية لم يتمكن المستخدمين من تفسيرها .
تمييز الذكاء الاصطناعي
بما يتعلق بنظام الذكاء الاصطناعي أوضح هشام عبدالعال أستاذ في مجال التكنولوجيا، أن الذكاء الاصطناعي لم يعد مجرد أداة تقنية تقتصر على تحليل البيانات وتقديم ردود بشكل الي ولكنه أصبح مع مرور الوقت لديه قدرة على تكوين ذاكرة اجتماعية عن المستخدمين وذلك عن طريق تحليل سلوكهم واختياراتهم واسلوب حديثهم .
مضيفاً، أن نظام الذكاء الاصطناعي الذي يوجد داخل التطبيق لا يصنف الخلفيات الاجتماعية بشكل مباشر، لكنه يتعامل حسب اللغة المستخدمة عامية أو فصحى، لكن التطبيق لا يميز بين طالب أو ربة منزل أو حتى عامل بشكل مباشر، بل يتعامل مع نوعية الأسئلة والأسلوب المقدمة له .
وتابع عبدالعال، لكن في حاله وجود أكثر من شخص يستخدم نفس الجهاز أو الحساب الردود ستكون متأثرة بالسياق السابق، أو ممكن ذلك يعطي إحساس أن الآلة متذكره أو بتتفاعل بشكل مختلف، لكن بمجرد إنهاء المحادثة أو حذفها، فسيتم غلط المحادثة .
هل تتذكر الآلة؟
اتفق معه في الرأي الأستاذ عمر أشرف، أستاذ في التكنولوجيا، مضيفاً أنه رسميًا، الذكاء الاصطناعي مثل تطبيق شآت جي بي تي لا يحتفظ بتفاصيل شخصية عن المستخدم إلا إذا المستخدم فعل خاصية الذاكرة بشكل واضح .
لكن هناك مستخدمين لاحظوا أن النموذج يناديهم بأسمائهم بدون ما يقدموها بشكل مباشر، وذلك فتح باب للشك حول وجود نوع من التتبع الخفي أو آلية لتجميع الأنماط السلوكية من وراء الكواليس .
بيانات تجمع بصمت
وفيما يتعلق بالأمن السيبراني يري الطرفان، انه يوجد تحديات تواجه الأمن السيبراني في ذلك الموضوع فتكوين هذه الذاكرة يكون عن طريق جمع بيانات شخصية وسلوكية دقيقة للغاية وغالبًا ما يتم ذلك دون إدراك المستخدم الكامل كما تشمل هذه البيانات أنماط الكتابة، نوعية الأسئلة بل وقد تكشف ما بين السطور عن خلفيات نفسية أو اجتماعية
ضافوا، أنه على الرغم من أن بعض الشركات تبرر استخدام البيانات وذلك لتحسين تجربة المستخدم إلا إن غياب الشفافية يفتح الباب للتتبع غير المباشر للهوية .
وفي حالة استخدام الذكاء الاصطناعي بدون رقابة صارمة أو قوانين واضحة من الممكن ان تتحول هذه الذاكرة إلى ملف شخصي خفي وذلك قابل لاستغلاله في اغراض تجارية أو سياسية أو أمنيه .
الذكاء الاصطناعي لم يعد مجرد أداة، بل أصبح قادر على تكوين صورة آلية عن المستخدم دون علمه، وبينما يعد هذا تطور تقني كبير، فإن غياب الرقابة يثير مخاوف حقيقية حول الخصوصية واستخدام البيانات الشخصية، مما يتطلب ضوابط صارمة تحمي المستخدم قبل أن تتحول التقنية إلى مخاطر خفيه.
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