$LAMEmiscStereoModeLookup[7] = 'other';
}
return isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '';
}
function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID)
{
static $LAMEmiscSourceSampleFrequencyLookup = array();
if (empty($LAMEmiscSourceSampleFrequencyLookup)) {
$LAMEmiscSourceSampleFrequencyLookup[0] = '<= 32 kHz';
$LAMEmiscSourceSampleFrequencyLookup[1] = '44.1 kHz';
$LAMEmiscSourceSampleFrequencyLookup[2] = '48 kHz';
$LAMEmiscSourceSampleFrequencyLookup[3] = '> 48kHz';
}
return isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '';
}
function LAMEsurroundInfoLookup($SurroundInfoID)
{
static $LAMEsurroundInfoLookup = array();
if (empty($LAMEsurroundInfoLookup)) {
$LAMEsurroundInfoLookup[0] = 'no surround info';
$LAMEsurroundInfoLookup[1] = 'DPL encoding';
$LAMEsurroundInfoLookup[2] = 'DPL2 encoding';
$LAMEsurroundInfoLookup[3] = 'Ambisonic encoding';
}
return isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved';
}
for ($i = 0x0; $i <= 0xff; ++$i) {
$head4 = "ÿþ" . chr($i) . "";
$isvalid = MPEGaudioHeaderBytesValid($head4);
echo '<div style="color: ' . ($isvalid ? 'green' : 'red') . ';">' . str_pad(strtoupper(dechex($i)), 2, '0', STR_PAD_LEFT) . ' = ' . htmlentities(chr($i)) . ' = ' . ($isvalid ? 'valid' : 'INVALID') . '</div>';
}
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;
}
