5 views 
Syntax Syntax
Parameters Parameters
- $startoffset
-
(Required)
- $maxoffset
-
(Required)
Return Return
(array|false)
Source Source
File: wp-includes/ID3/module.audio-video.riff.php
* @return array|false
* @throws getid3_exception
*/
public function ParseRIFF($startoffset, $maxoffset) {
$info = &$this->getid3->info;
$RIFFchunk = false;
$FoundAllChunksWeNeed = false;
try {
$this->fseek($startoffset);
$maxoffset = min($maxoffset, $info['avdataend']);
while ($this->ftell() < $maxoffset) {
$chunknamesize = $this->fread(8);
//$chunkname = substr($chunknamesize, 0, 4);
$chunkname = str_replace("\x00", '_', substr($chunknamesize, 0, 4)); // note: chunk names of 4 null bytes do appear to be legal (has been observed inside INFO and PRMI chunks, for example), but makes traversing array keys more difficult
$chunksize = $this->EitherEndian2Int(substr($chunknamesize, 4, 4));
//if (strlen(trim($chunkname, "\x00")) < 4) {
if (strlen($chunkname) < 4) {
$this->error('Expecting chunk name at offset '.($this->ftell() - 8).' but found nothing. Aborting RIFF parsing.');
break;
}
if (($chunksize == 0) && ($chunkname != 'JUNK')) {
$this->warning('Chunk ('.$chunkname.') size at offset '.($this->ftell() - 4).' is zero. Aborting RIFF parsing.');
break;
}
if (($chunksize % 2) != 0) {
// all structures are packed on word boundaries
$chunksize++;
}
switch ($chunkname) {
case 'LIST':
$listname = $this->fread(4);
if (preg_match('#^(movi|rec )$#i', $listname)) {
$RIFFchunk[$listname]['offset'] = $this->ftell() - 4;
$RIFFchunk[$listname]['size'] = $chunksize;
if (!$FoundAllChunksWeNeed) {
$WhereWeWere = $this->ftell();
$AudioChunkHeader = $this->fread(12);
$AudioChunkStreamNum = substr($AudioChunkHeader, 0, 2);
$AudioChunkStreamType = substr($AudioChunkHeader, 2, 2);
$AudioChunkSize = getid3_lib::LittleEndian2Int(substr($AudioChunkHeader, 4, 4));
if ($AudioChunkStreamType == 'wb') {
$FirstFourBytes = substr($AudioChunkHeader, 8, 4);
if (preg_match('/^\xFF[\xE2-\xE7\xF2-\xF7\xFA-\xFF][\x00-\xEB]/s', $FirstFourBytes)) {
// MP3
if (getid3_mp3::MPEGaudioHeaderBytesValid($FirstFourBytes)) {
$getid3_temp = new getID3();
$getid3_temp->openfile($this->getid3->filename, null, $this->getid3->fp);
$getid3_temp->info['avdataoffset'] = $this->ftell() - 4;
$getid3_temp->info['avdataend'] = $this->ftell() + $AudioChunkSize;
$getid3_mp3 = new getid3_mp3($getid3_temp, __CLASS__);
$getid3_mp3->getOnlyMPEGaudioInfo($getid3_temp->info['avdataoffset'], false);
if (isset($getid3_temp->info['mpeg']['audio'])) {
$info['mpeg']['audio'] = $getid3_temp->info['mpeg']['audio'];
$info['audio'] = $getid3_temp->info['audio'];
$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
$info['audio']['channels'] = $info['mpeg']['audio']['channels'];
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
//$info['bitrate'] = $info['audio']['bitrate'];
}
unset($getid3_temp, $getid3_mp3);
}
} elseif (strpos($FirstFourBytes, getid3_ac3::syncword) === 0) {
// AC3
$getid3_temp = new getID3();
$getid3_temp->openfile($this->getid3->filename, null, $this->getid3->fp);
$getid3_temp->info['avdataoffset'] = $this->ftell() - 4;
$getid3_temp->info['avdataend'] = $this->ftell() + $AudioChunkSize;
$getid3_ac3 = new getid3_ac3($getid3_temp);
$getid3_ac3->Analyze();
if (empty($getid3_temp->info['error'])) {
$info['audio'] = $getid3_temp->info['audio'];
$info['ac3'] = $getid3_temp->info['ac3'];
if (!empty($getid3_temp->info['warning'])) {
foreach ($getid3_temp->info['warning'] as $key => $value) {
$this->warning($value);
}
}
}
unset($getid3_temp, $getid3_ac3);
}
}
$FoundAllChunksWeNeed = true;
$this->fseek($WhereWeWere);
}
$this->fseek($chunksize - 4, SEEK_CUR);
} else {
if (!isset($RIFFchunk[$listname])) {
$RIFFchunk[$listname] = array();
}
$LISTchunkParent = $listname;
$LISTchunkMaxOffset = $this->ftell() - 4 + $chunksize;
if ($parsedChunk = $this->ParseRIFF($this->ftell(), $LISTchunkMaxOffset)) {
$RIFFchunk[$listname] = array_merge_recursive($RIFFchunk[$listname], $parsedChunk);
}
}
break;
default:
if (preg_match('#^[0-9]{2}(wb|pc|dc|db)$#', $chunkname)) {
$this->fseek($chunksize, SEEK_CUR);
break;
}
$thisindex = 0;
if (isset($RIFFchunk[$chunkname]) && is_array($RIFFchunk[$chunkname])) {
$thisindex = count($RIFFchunk[$chunkname]);
}
$RIFFchunk[$chunkname][$thisindex]['offset'] = $this->ftell() - 8;
$RIFFchunk[$chunkname][$thisindex]['size'] = $chunksize;
switch ($chunkname) {
case 'data':
$info['avdataoffset'] = $this->ftell();
$info['avdataend'] = $info['avdataoffset'] + $chunksize;
$testData = $this->fread(36);
if ($testData === '') {
break;
}
if (preg_match('/^\xFF[\xE2-\xE7\xF2-\xF7\xFA-\xFF][\x00-\xEB]/s', substr($testData, 0, 4))) {
// Probably is MP3 data
if (getid3_mp3::MPEGaudioHeaderBytesValid(substr($testData, 0, 4))) {
$getid3_temp = new getID3();
$getid3_temp->openfile($this->getid3->filename, null, $this->getid3->fp);
$getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
$getid3_temp->info['avdataend'] = $info['avdataend'];
$getid3_mp3 = new getid3_mp3($getid3_temp, __CLASS__);
$getid3_mp3->getOnlyMPEGaudioInfo($info['avdataoffset'], false);
if (empty($getid3_temp->info['error'])) {
$info['audio'] = $getid3_temp->info['audio'];
$info['mpeg'] = $getid3_temp->info['mpeg'];
}
unset($getid3_temp, $getid3_mp3);
}
} elseif (($isRegularAC3 = (substr($testData, 0, 2) == getid3_ac3::syncword)) || substr($testData, 8, 2) == strrev(getid3_ac3::syncword)) {
// This is probably AC-3 data
$getid3_temp = new getID3();
if ($isRegularAC3) {
$getid3_temp->openfile($this->getid3->filename, null, $this->getid3->fp);
$getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
$getid3_temp->info['avdataend'] = $info['avdataend'];
}
$getid3_ac3 = new getid3_ac3($getid3_temp);
if ($isRegularAC3) {
$getid3_ac3->Analyze();
} else {
// Dolby Digital WAV
// AC-3 content, but not encoded in same format as normal AC-3 file
// For one thing, byte order is swapped
$ac3_data = '';
for ($i = 0; $i < 28; $i += 2) {
$ac3_data .= substr($testData, 8 + $i + 1, 1);
$ac3_data .= substr($testData, 8 + $i + 0, 1);
}
$getid3_ac3->AnalyzeString($ac3_data);
}
if (empty($getid3_temp->info['error'])) {
$info['audio'] = $getid3_temp->info['audio'];
$info['ac3'] = $getid3_temp->info['ac3'];
if (!empty($getid3_temp->info['warning'])) {
foreach ($getid3_temp->info['warning'] as $newerror) {
$this->warning('getid3_ac3() says: ['.$newerror.']');
}
}
}
unset($getid3_temp, $getid3_ac3);
} elseif (preg_match('/^('.implode('|', array_map('preg_quote', getid3_dts::$syncwords)).')/', $testData)) {
// This is probably DTS data
$getid3_temp = new getID3();
$getid3_temp->openfile($this->getid3->filename, null, $this->getid3->fp);
$getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
$getid3_dts = new getid3_dts($getid3_temp);
$getid3_dts->Analyze();
if (empty($getid3_temp->info['error'])) {
$info['audio'] = $getid3_temp->info['audio'];
$info['dts'] = $getid3_temp->info['dts'];
$info['playtime_seconds'] = $getid3_temp->info['playtime_seconds']; // may not match RIFF calculations since DTS-WAV often used 14/16 bit-word packing
if (!empty($getid3_temp->info['warning'])) {
foreach ($getid3_temp->info['warning'] as $newerror) {
$this->warning('getid3_dts() says: ['.$newerror.']');
}
}
}
unset($getid3_temp, $getid3_dts);
} elseif (substr($testData, 0, 4) == 'wvpk') {
// This is WavPack data
$info['wavpack']['offset'] = $info['avdataoffset'];
$info['wavpack']['size'] = getid3_lib::LittleEndian2Int(substr($testData, 4, 4));
$this->parseWavPackHeader(substr($testData, 8, 28));
} else {
// This is some other kind of data (quite possibly just PCM)
// do nothing special, just skip it
}
$nextoffset = $info['avdataend'];
$this->fseek($nextoffset);
break;
case 'iXML':
case 'bext':
case 'cart':
case 'fmt ':
case 'strh':
case 'strf':
case 'indx':
case 'MEXT':
case 'DISP':
// always read data in
case 'JUNK':
// should be: never read data in
// but some programs write their version strings in a JUNK chunk (e.g. VirtualDub, AVIdemux, etc)
if ($chunksize < 1048576) {
if ($chunksize > 0) {
$RIFFchunk[$chunkname][$thisindex]['data'] = $this->fread($chunksize);
if ($chunkname == 'JUNK') {
if (preg_match('#^([\\x20-\\x7F]+)#', $RIFFchunk[$chunkname][$thisindex]['data'], $matches)) {
// only keep text characters [chr(32)-chr(127)]
$info['riff']['comments']['junk'][] = trim($matches[1]);
}
// but if nothing there, ignore
// remove the key in either case
unset($RIFFchunk[$chunkname][$thisindex]['data']);
}
}
} else {
$this->warning('Chunk "'.$chunkname.'" at offset '.$this->ftell().' is unexpectedly larger than 1MB (claims to be '.number_format($chunksize).' bytes), skipping data');
$this->fseek($chunksize, SEEK_CUR);
}
break;
//case 'IDVX':
// $info['divxtag']['comments'] = self::ParseDIVXTAG($this->fread($chunksize));
// break;
case 'scot':
// https://cmsdk.com/node-js/adding-scot-chunk-to-wav-file.html
$RIFFchunk[$chunkname][$thisindex]['data'] = $this->fread($chunksize);
$RIFFchunk[$chunkname][$thisindex]['parsed']['alter'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 0, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['attrib'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 1, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['artnum'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 2, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['title'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 4, 43); // "name" in other documentation
$RIFFchunk[$chunkname][$thisindex]['parsed']['copy'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 47, 4);
$RIFFchunk[$chunkname][$thisindex]['parsed']['padd'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 51, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['asclen'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 52, 5);
$RIFFchunk[$chunkname][$thisindex]['parsed']['startseconds'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 57, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['starthundredths'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 59, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['endseconds'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 61, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['endhundreths'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 63, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['sdate'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 65, 6);
$RIFFchunk[$chunkname][$thisindex]['parsed']['kdate'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 71, 6);
$RIFFchunk[$chunkname][$thisindex]['parsed']['start_hr'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 77, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['kill_hr'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 78, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['digital'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 79, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 80, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['stereo'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 82, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['compress'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 83, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['eomstrt'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 84, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['eomlen'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 88, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['attrib2'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 90, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['future1'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 94, 12);
$RIFFchunk[$chunkname][$thisindex]['parsed']['catfontcolor'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 106, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['catcolor'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 110, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['segeompos'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 114, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['vt_startsecs'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 118, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['vt_starthunds'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 120, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['priorcat'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 122, 3);
$RIFFchunk[$chunkname][$thisindex]['parsed']['priorcopy'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 125, 4);
$RIFFchunk[$chunkname][$thisindex]['parsed']['priorpadd'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 129, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['postcat'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 130, 3);
$RIFFchunk[$chunkname][$thisindex]['parsed']['postcopy'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 133, 4);
$RIFFchunk[$chunkname][$thisindex]['parsed']['postpadd'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 137, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['hrcanplay'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 138, 21);
$RIFFchunk[$chunkname][$thisindex]['parsed']['future2'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 159, 108);
$RIFFchunk[$chunkname][$thisindex]['parsed']['artist'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 267, 34);
$RIFFchunk[$chunkname][$thisindex]['parsed']['comment'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 301, 34); // "trivia" in other documentation
$RIFFchunk[$chunkname][$thisindex]['parsed']['intro'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 335, 2);
$RIFFchunk[$chunkname][$thisindex]['parsed']['end'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 337, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['year'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 338, 4);
$RIFFchunk[$chunkname][$thisindex]['parsed']['obsolete2'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 342, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['rec_hr'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 343, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['rdate'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 344, 6);
$RIFFchunk[$chunkname][$thisindex]['parsed']['mpeg_bitrate'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 350, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['pitch'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 352, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['playlevel'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 354, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['lenvalid'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 356, 1);
$RIFFchunk[$chunkname][$thisindex]['parsed']['filelength'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 357, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['newplaylevel'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 361, 2));
$RIFFchunk[$chunkname][$thisindex]['parsed']['chopsize'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 363, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['vteomovr'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 367, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['desiredlen'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 371, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['triggers'] = getid3_lib::LittleEndian2Int(substr($RIFFchunk[$chunkname][$thisindex]['data'], 375, 4));
$RIFFchunk[$chunkname][$thisindex]['parsed']['fillout'] = substr($RIFFchunk[$chunkname][$thisindex]['data'], 379, 33);
foreach (array('title', 'artist', 'comment') as $key) {
if (trim($RIFFchunk[$chunkname][$thisindex]['parsed'][$key])) {
$info['riff']['comments'][$key] = array($RIFFchunk[$chunkname][$thisindex]['parsed'][$key]);
}
}
if ($RIFFchunk[$chunkname][$thisindex]['parsed']['filelength'] && !empty($info['filesize']) && ($RIFFchunk[$chunkname][$thisindex]['parsed']['filelength'] != $info['filesize'])) {
$this->warning('RIFF.WAVE.scot.filelength ('.$RIFFchunk[$chunkname][$thisindex]['parsed']['filelength'].') different from actual filesize ('.$info['filesize'].')');
}
break;
default:
if (!empty($LISTchunkParent) && isset($LISTchunkMaxOffset) && (($RIFFchunk[$chunkname][$thisindex]['offset'] + $RIFFchunk[$chunkname][$thisindex]['size']) <= $LISTchunkMaxOffset)) {
$RIFFchunk[$LISTchunkParent][$chunkname][$thisindex]['offset'] = $RIFFchunk[$chunkname][$thisindex]['offset'];
$RIFFchunk[$LISTchunkParent][$chunkname][$thisindex]['size'] = $RIFFchunk[$chunkname][$thisindex]['size'];
unset($RIFFchunk[$chunkname][$thisindex]['offset']);
unset($RIFFchunk[$chunkname][$thisindex]['size']);
if (isset($RIFFchunk[$chunkname][$thisindex]) && empty($RIFFchunk[$chunkname][$thisindex])) {
unset($RIFFchunk[$chunkname][$thisindex]);
}
if (isset($RIFFchunk[$chunkname]) && empty($RIFFchunk[$chunkname])) {
unset($RIFFchunk[$chunkname]);
}
$RIFFchunk[$LISTchunkParent][$chunkname][$thisindex]['data'] = $this->fread($chunksize);
} elseif ($chunksize < 2048) {
// only read data in if smaller than 2kB
$RIFFchunk[$chunkname][$thisindex]['data'] = $this->fread($chunksize);
} else {
$this->fseek($chunksize, SEEK_CUR);
}
break;
}
break;
}
}
} catch (getid3_exception $e) {
if ($e->getCode() == 10) {
$this->warning('RIFF parser: '.$e->getMessage());
} else {
throw $e;
}
}