function getRIFFHeaderFilepointer(&$fd, &$MP3fileInfo)
{
$offset = 0;
rewind($fd);
$MP3fileInfo['RIFF'] = ParseRIFF($fd, $offset, $MP3fileInfo['filesize']);
$streamindex = 0;
if (!is_array($MP3fileInfo['RIFF'])) {
$MP3fileInfo['error'] .= "\n" . 'Cannot parse RIFF (this is maybe not a RIFF / WAV / AVI file?)';
unset($MP3fileInfo['RIFF']);
unset($MP3fileInfo['fileformat']);
return FALSE;
}
$arraykeys = array_keys($MP3fileInfo['RIFF']);
switch ($arraykeys[0]) {
case 'WAVE':
$MP3fileInfo['fileformat'] = 'wav';
if (isset($MP3fileInfo['RIFF']['WAVE']['fmt '][0]['data'])) {
$fmtData = $MP3fileInfo['RIFF']['WAVE']['fmt '][0]['data'];
$MP3fileInfo['RIFF']['raw']['fmt ']['wFormatTag'] = LittleEndian2Int(substr($fmtData, 0, 2));
$MP3fileInfo['RIFF']['raw']['fmt ']['nChannels'] = LittleEndian2Int(substr($fmtData, 2, 2));
$MP3fileInfo['RIFF']['raw']['fmt ']['nSamplesPerSec'] = LittleEndian2Int(substr($fmtData, 4, 4));
$MP3fileInfo['RIFF']['raw']['fmt ']['nAvgBytesPerSec'] = LittleEndian2Int(substr($fmtData, 8, 4));
$MP3fileInfo['RIFF']['raw']['fmt ']['nBlockAlign'] = LittleEndian2Int(substr($fmtData, 12, 2));
$MP3fileInfo['RIFF']['raw']['fmt ']['nBitsPerSample'] = LittleEndian2Int(substr($fmtData, 14, 2));
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['format'] = RIFFwFormatTagLookup($MP3fileInfo['RIFF']['raw']['fmt ']['wFormatTag']);
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['channels'] = $MP3fileInfo['RIFF']['raw']['fmt ']['nChannels'];
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['channelmode'] = $MP3fileInfo['RIFF']['audio']["{$streamindex}"]['channels'] == 1 ? 'mono' : 'stereo';
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['frequency'] = $MP3fileInfo['RIFF']['raw']['fmt ']['nSamplesPerSec'];
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['bitrate'] = $MP3fileInfo['RIFF']['raw']['fmt ']['nAvgBytesPerSec'] * 8;
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['bitspersample'] = $MP3fileInfo['RIFF']['raw']['fmt ']['nBitsPerSample'];
}
if (isset($MP3fileInfo['RIFF']['WAVE']['rgad'][0]['data'])) {
$rgadData = $MP3fileInfo['RIFF']['WAVE']['rgad'][0]['data'];
$MP3fileInfo['RIFF']['raw']['rgad']['fPeakAmplitude'] = LittleEndian2Float(substr($rgadData, 0, 4));
$MP3fileInfo['RIFF']['raw']['rgad']['nRadioRgAdjust'] = LittleEndian2Int(substr($rgadData, 4, 2));
$MP3fileInfo['RIFF']['raw']['rgad']['nAudiophileRgAdjust'] = LittleEndian2Int(substr($rgadData, 6, 2));
$nRadioRgAdjustBitstring = str_pad(Dec2Bin($MP3fileInfo['RIFF']['raw']['rgad']['nRadioRgAdjust']), 16, '0', STR_PAD_LEFT);
$nAudiophileRgAdjustBitstring = str_pad(Dec2Bin($MP3fileInfo['RIFF']['raw']['rgad']['nAudiophileRgAdjust']), 16, '0', STR_PAD_LEFT);
$MP3fileInfo['RIFF']['raw']['rgad']['radio']['name'] = Bin2Dec(substr($nRadioRgAdjustBitstring, 0, 3));
$MP3fileInfo['RIFF']['raw']['rgad']['radio']['originator'] = Bin2Dec(substr($nRadioRgAdjustBitstring, 3, 3));
$MP3fileInfo['RIFF']['raw']['rgad']['radio']['signbit'] = Bin2Dec(substr($nRadioRgAdjustBitstring, 6, 1));
$MP3fileInfo['RIFF']['raw']['rgad']['radio']['adjustment'] = Bin2Dec(substr($nRadioRgAdjustBitstring, 7, 9));
$MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['name'] = Bin2Dec(substr($nAudiophileRgAdjustBitstring, 0, 3));
$MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['originator'] = Bin2Dec(substr($nAudiophileRgAdjustBitstring, 3, 3));
$MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['signbit'] = Bin2Dec(substr($nAudiophileRgAdjustBitstring, 6, 1));
$MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['adjustment'] = Bin2Dec(substr($nAudiophileRgAdjustBitstring, 7, 9));
$MP3fileInfo['RIFF']['rgad']['peakamplitude'] = $MP3fileInfo['RIFF']['raw']['rgad']['fPeakAmplitude'];
if ($MP3fileInfo['RIFF']['raw']['rgad']['radio']['name'] != 0 && $MP3fileInfo['RIFF']['raw']['rgad']['radio']['originator'] != 0) {
$MP3fileInfo['RIFF']['rgad']['radio']['name'] = RGADnameLookup($MP3fileInfo['RIFF']['raw']['rgad']['radio']['name']);
$MP3fileInfo['RIFF']['rgad']['radio']['originator'] = RGADoriginatorLookup($MP3fileInfo['RIFF']['raw']['rgad']['radio']['originator']);
$MP3fileInfo['RIFF']['rgad']['radio']['adjustment'] = RGADadjustmentLookup($MP3fileInfo['RIFF']['raw']['rgad']['radio']['adjustment'], $MP3fileInfo['RIFF']['raw']['rgad']['radio']['signbit']);
}
if ($MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['name'] != 0 && $MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['originator'] != 0) {
$MP3fileInfo['RIFF']['rgad']['audiophile']['name'] = RGADnameLookup($MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['name']);
$MP3fileInfo['RIFF']['rgad']['audiophile']['originator'] = RGADoriginatorLookup($MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['originator']);
$MP3fileInfo['RIFF']['rgad']['audiophile']['adjustment'] = RGADadjustmentLookup($MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['adjustment'], $MP3fileInfo['RIFF']['raw']['rgad']['audiophile']['signbit']);
}
}
if (isset($MP3fileInfo['RIFF']['WAVE']['fact'][0]['data'])) {
$MP3fileInfo['RIFF']['raw']['fact']['NumberOfSamples'] = LittleEndian2Int(substr($MP3fileInfo['RIFF']['WAVE']['fact'][0]['data'], 0, 4));
if (isset($MP3fileInfo['RIFF']['raw']['fmt ']['nSamplesPerSec']) && $MP3fileInfo['RIFF']['raw']['fmt ']['nSamplesPerSec']) {
$MP3fileInfo['playtime_seconds'] = (double) $MP3fileInfo['RIFF']['raw']['fact']['NumberOfSamples'] / $MP3fileInfo['RIFF']['raw']['fmt ']['nSamplesPerSec'];
}
if (isset($MP3fileInfo['RIFF']['raw']['fmt ']['nAvgBytesPerSec']) && $MP3fileInfo['RIFF']['raw']['fmt ']['nAvgBytesPerSec']) {
$MP3fileInfo['audiobytes'] = CastAsInt(round($MP3fileInfo['playtime_seconds'] * $MP3fileInfo['RIFF']['raw']['fmt ']['nAvgBytesPerSec']));
$MP3fileInfo['bitrate'] = CastAsInt($MP3fileInfo['RIFF']['raw']['fmt ']['nAvgBytesPerSec'] * 8);
}
}
if (!isset($MP3fileInfo['audiobytes']) && isset($MP3fileInfo['RIFF']['WAVE']['data'][0]['size'])) {
$MP3fileInfo['audiobytes'] = $MP3fileInfo['RIFF']['WAVE']['data'][0]['size'];
}
if (!isset($MP3fileInfo['bitrate']) && isset($MP3fileInfo['RIFF']['audio']["{$streamindex}"]['bitrate']) && isset($MP3fileInfo['audiobytes'])) {
$MP3fileInfo['bitrate'] = $MP3fileInfo['RIFF']['audio']["{$streamindex}"]['bitrate'];
$MP3fileInfo['playtime_seconds'] = (double) ($MP3fileInfo['audiobytes'] * 8 / $MP3fileInfo['bitrate']);
}
break;
case 'AVI ':
$MP3fileInfo['fileformat'] = 'avi';
if (isset($MP3fileInfo['RIFF']['AVI ']['hdrl']['avih']["{$streamindex}"]['data'])) {
$avihData = $MP3fileInfo['RIFF']['AVI ']['hdrl']['avih']["{$streamindex}"]['data'];
$MP3fileInfo['RIFF']['raw']['avih']['dwMicroSecPerFrame'] = LittleEndian2Int(substr($avihData, 0, 4));
// frame display rate (or 0L)
$MP3fileInfo['RIFF']['raw']['avih']['dwMaxBytesPerSec'] = LittleEndian2Int(substr($avihData, 4, 4));
// max. transfer rate
$MP3fileInfo['RIFF']['raw']['avih']['dwPaddingGranularity'] = LittleEndian2Int(substr($avihData, 8, 4));
// pad to multiples of this size; normally 2K.
$MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] = LittleEndian2Int(substr($avihData, 12, 4));
// the ever-present flags
$MP3fileInfo['RIFF']['raw']['avih']['dwTotalFrames'] = LittleEndian2Int(substr($avihData, 16, 4));
// # frames in file
$MP3fileInfo['RIFF']['raw']['avih']['dwInitialFrames'] = LittleEndian2Int(substr($avihData, 20, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwStreams'] = LittleEndian2Int(substr($avihData, 24, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwSuggestedBufferSize'] = LittleEndian2Int(substr($avihData, 28, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwWidth'] = LittleEndian2Int(substr($avihData, 32, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwHeight'] = LittleEndian2Int(substr($avihData, 36, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwScale'] = LittleEndian2Int(substr($avihData, 40, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwRate'] = LittleEndian2Int(substr($avihData, 44, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwStart'] = LittleEndian2Int(substr($avihData, 48, 4));
$MP3fileInfo['RIFF']['raw']['avih']['dwLength'] = LittleEndian2Int(substr($avihData, 52, 4));
$MP3fileInfo['RIFF']['raw']['avih']['flags']['hasindex'] = (bool) ($MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] & 0x10);
$MP3fileInfo['RIFF']['raw']['avih']['flags']['mustuseindex'] = (bool) ($MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] & 0x20);
$MP3fileInfo['RIFF']['raw']['avih']['flags']['interleaved'] = (bool) ($MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] & 0x100);
$MP3fileInfo['RIFF']['raw']['avih']['flags']['trustcktype'] = (bool) ($MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] & 0x800);
$MP3fileInfo['RIFF']['raw']['avih']['flags']['capturedfile'] = (bool) ($MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] & 0x10000);
$MP3fileInfo['RIFF']['raw']['avih']['flags']['copyrighted'] = (bool) ($MP3fileInfo['RIFF']['raw']['avih']['dwFlags'] & 0x20010);
$MP3fileInfo['RIFF']['video']["{$streamindex}"]['frame_width'] = $MP3fileInfo['RIFF']['raw']['avih']['dwWidth'];
$MP3fileInfo['RIFF']['video']["{$streamindex}"]['frame_height'] = $MP3fileInfo['RIFF']['raw']['avih']['dwHeight'];
$MP3fileInfo['RIFF']['video']["{$streamindex}"]['frame_rate'] = round(1000000 / $MP3fileInfo['RIFF']['raw']['avih']['dwMicroSecPerFrame'], 3);
$MP3fileInfo['playtime_seconds'] = $MP3fileInfo['RIFF']['raw']['avih']['dwTotalFrames'] * ($MP3fileInfo['RIFF']['raw']['avih']['dwMicroSecPerFrame'] / 1000000);
$MP3fileInfo['bitrate'] = $MP3fileInfo['filesize'] / $MP3fileInfo['playtime_seconds'] * 8;
}
if (isset($MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strh'][0]['data'])) {
if (is_array($MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strh'])) {
for ($i = 0; $i < count($MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strh']); $i++) {
if (isset($MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strh']["{$i}"]['data'])) {
$strhData = $MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strh']["{$i}"]['data'];
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['fccType'] = substr($strhData, 0, 4);
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['fccHandler'] = substr($strhData, 4, 4);
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwFlags'] = LittleEndian2Int(substr($strhData, 8, 4));
// Contains AVITF_* flags
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['wPriority'] = LittleEndian2Int(substr($strhData, 12, 2));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['wLanguage'] = LittleEndian2Int(substr($strhData, 14, 2));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwInitialFrames'] = LittleEndian2Int(substr($strhData, 16, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwScale'] = LittleEndian2Int(substr($strhData, 20, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwRate'] = LittleEndian2Int(substr($strhData, 24, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwStart'] = LittleEndian2Int(substr($strhData, 28, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwLength'] = LittleEndian2Int(substr($strhData, 32, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwSuggestedBufferSize'] = LittleEndian2Int(substr($strhData, 36, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwQuality'] = LittleEndian2Int(substr($strhData, 40, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['dwSampleSize'] = LittleEndian2Int(substr($strhData, 44, 4));
$MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['rcFrame'] = LittleEndian2Int(substr($strhData, 48, 4));
if (isset($MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strf']["{$i}"]['data'])) {
$strfData = $MP3fileInfo['RIFF']['AVI ']['hdrl']['strl']['strf']["{$i}"]['data'];
switch ($MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['fccType']) {
case 'auds':
if (isset($MP3fileInfo['RIFF']['audio']) && is_array($MP3fileInfo['RIFF']['audio'])) {
$streamindex = count($MP3fileInfo['RIFF']['audio']);
}
$MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['wFormatTag'] = LittleEndian2Int(substr($strfData, 0, 2));
$MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nChannels'] = LittleEndian2Int(substr($strfData, 2, 2));
$MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nSamplesPerSec'] = LittleEndian2Int(substr($strfData, 4, 4));
$MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nAvgBytesPerSec'] = LittleEndian2Int(substr($strfData, 8, 4));
$MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nBlockAlign'] = LittleEndian2Int(substr($strfData, 12, 2));
$MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nBitsPerSample'] = LittleEndian2Int(substr($strfData, 14, 2));
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['format'] = RIFFwFormatTagLookup($MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['wFormatTag']);
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['channels'] = $MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nChannels'];
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['channelmode'] = $MP3fileInfo['RIFF']['audio']["{$streamindex}"]['channels'] == 1 ? 'mono' : 'stereo';
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['frequency'] = $MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nSamplesPerSec'];
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['bitrate'] = $MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nAvgBytesPerSec'] * 8;
$MP3fileInfo['RIFF']['audio']["{$streamindex}"]['bitspersample'] = $MP3fileInfo['RIFF']['raw']['strf']['auds']["{$streamindex}"]['nBitsPerSample'];
break;
case 'vids':
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biSize'] = LittleEndian2Int(substr($strfData, 0, 4));
// number of bytes required by the BITMAPINFOHEADER structure
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biWidth'] = LittleEndian2Int(substr($strfData, 4, 4));
// width of the bitmap in pixels
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biHeight'] = LittleEndian2Int(substr($strfData, 8, 4));
// height of the bitmap in pixels. If biHeight is positive, the bitmap is a "bottom-up" DIB and its origin is the lower left corner. If biHeight is negative, the bitmap is a "top-down" DIB and its origin is the upper left corner
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biPlanes'] = LittleEndian2Int(substr($strfData, 12, 2));
// number of color planes on the target device. In most cases this value must be set to 1
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biBitCount'] = LittleEndian2Int(substr($strfData, 14, 2));
// Specifies the number of bits per pixels
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['fourcc'] = substr($strfData, 16, 4);
//
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biSizeImage'] = LittleEndian2Int(substr($strfData, 20, 4));
// size of the bitmap data section of the image (the actual pixel data, excluding BITMAPINFOHEADER and RGBQUAD structures)
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biXPelsPerMeter'] = LittleEndian2Int(substr($strfData, 24, 4));
// horizontal resolution, in pixels per metre, of the target device
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biYPelsPerMeter'] = LittleEndian2Int(substr($strfData, 28, 4));
// vertical resolution, in pixels per metre, of the target device
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biClrUsed'] = LittleEndian2Int(substr($strfData, 32, 4));
// actual number of color indices in the color table used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression
$MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['biClrImportant'] = LittleEndian2Int(substr($strfData, 36, 4));
// number of color indices that are considered important for displaying the bitmap. If this value is zero, all colors are important
$MP3fileInfo['RIFF']['video']["{$streamindex}"]['codec'] = RIFFfourccLookup($MP3fileInfo['RIFF']['raw']['strh']["{$i}"]['fccHandler']);
if (!$MP3fileInfo['RIFF']['video']["{$streamindex}"]['codec'] && RIFFfourccLookup($MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['fourcc'])) {
RIFFfourccLookup($MP3fileInfo['RIFF']['raw']['strf']['vids']["{$streamindex}"]['fourcc']);
}
break;
}
}
}
}
}
}
break;
default:
unset($MP3fileInfo['fileformat']);
break;
}
if (isset($MP3fileInfo['RIFF']['WAVE']['INFO']) && is_array($MP3fileInfo['RIFF']['WAVE']['INFO'])) {
$MP3fileInfo['RIFF']['title'] = trim(substr($MP3fileInfo['RIFF']['WAVE']['INFO']['DISP'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['DISP']) - 1]['data'], 4));
$MP3fileInfo['RIFF']['artist'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['IART'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['IART']) - 1]['data']);
$MP3fileInfo['RIFF']['genre'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['IGNR'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['IGNR']) - 1]['data']);
$MP3fileInfo['RIFF']['comment'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['ICMT'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['ICMT']) - 1]['data']);
$MP3fileInfo['RIFF']['copyright'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['ICOP'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['ICOP']) - 1]['data']);
$MP3fileInfo['RIFF']['engineers'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['IENG'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['IENG']) - 1]['data']);
$MP3fileInfo['RIFF']['keywords'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['IKEY'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['IKEY']) - 1]['data']);
$MP3fileInfo['RIFF']['originalmedium'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['IMED'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['IMED']) - 1]['data']);
$MP3fileInfo['RIFF']['name'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['INAM'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['INAM']) - 1]['data']);
$MP3fileInfo['RIFF']['sourcesupplier'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['ISRC'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['ISRC']) - 1]['data']);
$MP3fileInfo['RIFF']['digitizer'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['ITCH'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['ITCH']) - 1]['data']);
$MP3fileInfo['RIFF']['subject'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['ISBJ'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['ISBJ']) - 1]['data']);
$MP3fileInfo['RIFF']['digitizationsource'] = trim($MP3fileInfo['RIFF']['WAVE']['INFO']['ISRF'][count($MP3fileInfo['RIFF']['WAVE']['INFO']['ISRF']) - 1]['data']);
}
foreach ($MP3fileInfo['RIFF'] as $key => $value) {
if (!is_array($value) && !$value) {
unset($MP3fileInfo['RIFF']["{$key}"]);
}
}
return TRUE;
}
function ParseRIFF(&$fd, $startoffset, $maxoffset, &$ThisFileInfo)
{
$maxoffset = min($maxoffset, $ThisFileInfo['avdataend']);
$RIFFchunk = false;
fseek($fd, $startoffset, SEEK_SET);
while (ftell($fd) < $maxoffset) {
$chunkname = fread($fd, 4);
$chunksize = EitherEndian2Int($ThisFileInfo, fread($fd, 4));
if ($chunksize % 2 != 0) {
// all structures are packed on word boundaries
$chunksize++;
}
switch ($chunkname) {
case 'LIST':
$listname = fread($fd, 4);
switch ($listname) {
case 'movi':
case 'rec ':
// skip over
$RIFFchunk["{$listname}"]['offset'] = ftell($fd) - 4;
$RIFFchunk["{$listname}"]['size'] = $chunksize;
fseek($fd, $chunksize - 4, SEEK_CUR);
break;
default:
if (!isset($RIFFchunk["{$listname}"])) {
$RIFFchunk["{$listname}"] = array();
}
$RIFFchunk["{$listname}"] = array_merge_recursive($RIFFchunk["{$listname}"], ParseRIFF($fd, ftell($fd), ftell($fd) + $chunksize - 4, $ThisFileInfo));
break;
}
break;
default:
$thisindex = 0;
if (isset($RIFFchunk["{$chunkname}"]) && is_array($RIFFchunk["{$chunkname}"])) {
$thisindex = count($RIFFchunk["{$chunkname}"]);
}
$RIFFchunk["{$chunkname}"][$thisindex]['offset'] = ftell($fd) - 8;
$RIFFchunk["{$chunkname}"][$thisindex]['size'] = $chunksize;
switch ($chunkname) {
case 'data':
$RIFFdataChunkContentsTest = fread($fd, 8);
if (strlen($RIFFdataChunkContentsTest) > 0 && $RIFFdataChunkContentsTest[0] == chr(0xff)) {
// Probably (but not guaranteed) that this is MP3 data
require_once GETID3_INCLUDEPATH . 'getid3.mp3.php';
if (MPEGaudioHeaderBytesValid(substr($RIFFdataChunkContentsTest, 0, 4))) {
$WhereWeWere = ftell($fd);
getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $RIFFchunk["{$chunkname}"][$thisindex]['offset'], false);
fseek($fd, $WhereWeWere, SEEK_SET);
if (isset($ThisFileInfo['mpeg']['audio'])) {
$ThisFileInfo['audio']['dataformat'] = 'mp' . strlen($ThisFileInfo['mpeg']['audio']['layer']);
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'] * 1000;
$ThisFileInfo['bitrate'] = $ThisFileInfo['audio']['bitrate'];
$ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']);
}
fseek($fd, $chunksize - 8, SEEK_CUR);
}
} else {
if (substr($RIFFdataChunkContentsTest, 0, 4) == 'wvpk') {
// This is WavPack data
$ThisFileInfo['wavpack']['offset'] = ftell($fd) - 8;
$ThisFileInfo['wavpack']['size'] = LittleEndian2Int(substr($RIFFdataChunkContentsTest, 4, 4));
$WavPackData = fread($fd, $ThisFileInfo['wavpack']['size']);
RIFFparseWavPackHeader($WavPackData, $ThisFileInfo);
fseek($fd, $chunksize - 8 - $ThisFileInfo['wavpack']['size'], SEEK_CUR);
} else {
// This is some other kind of data (quite possibly just PCM)
// do nothing special, just skip it
fseek($fd, $chunksize - 8, SEEK_CUR);
}
}
break;
case 'bext':
case 'cart':
case 'fmt ':
case 'MEXT':
case 'DISP':
// always read data in
$RIFFchunk["{$chunkname}"][$thisindex]['data'] = fread($fd, $chunksize);
break;
default:
// read data in if smaller than 2kB
if ($chunksize < 2048) {
$RIFFchunk["{$chunkname}"][$thisindex]['data'] = fread($fd, $chunksize);
} else {
fseek($fd, $chunksize, SEEK_CUR);
}
break;
}
break;
}
}
return $RIFFchunk;
}
function ParseRIFF(&$fd, $startoffset, $maxoffset, &$ThisFileInfo)
{
$RIFFchunk = false;
fseek($fd, $startoffset, SEEK_SET);
while (ftell($fd) < $maxoffset) {
$chunkname = fread($fd, 4);
$chunksize = LittleEndian2Int(fread($fd, 4));
if ($chunksize % 2 != 0) {
// all structures are packed on word boundaries
$chunksize++;
}
switch ($chunkname) {
case 'LIST':
$listname = fread($fd, 4);
switch ($listname) {
case 'movi':
case 'rec ':
// skip over
$RIFFchunk["{$listname}"]['offset'] = ftell($fd) - 4;
$RIFFchunk["{$listname}"]['size'] = $chunksize;
fseek($fd, $chunksize - 4, SEEK_CUR);
$ThisFileInfo['avdataoffset'] = max($ThisFileInfo['avdataoffset'], $RIFFchunk["{$listname}"]['offset']);
$ThisFileInfo['avdataend'] = max($ThisFileInfo['avdataend'], $RIFFchunk["{$listname}"]['offset'] + $RIFFchunk["{$listname}"]['size']);
break;
default:
if (!isset($RIFFchunk["{$listname}"])) {
$RIFFchunk["{$listname}"] = array();
}
$RIFFchunk["{$listname}"] = array_merge_recursive($RIFFchunk["{$listname}"], ParseRIFF($fd, ftell($fd), ftell($fd) + $chunksize - 4, $ThisFileInfo));
break;
}
break;
default:
$thisindex = 0;
if (isset($RIFFchunk["{$chunkname}"]) && is_array($RIFFchunk["{$chunkname}"])) {
$thisindex = count($RIFFchunk["{$chunkname}"]);
}
$RIFFchunk["{$chunkname}"][$thisindex]['offset'] = ftell($fd) - 8;
$RIFFchunk["{$chunkname}"][$thisindex]['size'] = $chunksize;
if ($chunksize <= 2048) {
$RIFFchunk["{$chunkname}"][$thisindex]['data'] = fread($fd, $chunksize);
} else {
fseek($fd, $chunksize, SEEK_CUR);
}
break;
}
}
return $RIFFchunk;
}
