function getOggHeaderFilepointer(&$fd, &$ThisFileInfo)
{
$ThisFileInfo['fileformat'] = 'ogg';
// Warn about illegal tags - only vorbiscomments are allowed
if (isset($ThisFileInfo['id3v2'])) {
$ThisFileInfo['warning'] .= "\n" . 'Illegal ID3v2 tag present.';
}
if (isset($ThisFileInfo['id3v1'])) {
$ThisFileInfo['warning'] .= "\n" . 'Illegal ID3v1 tag present.';
}
if (isset($ThisFileInfo['ape'])) {
$ThisFileInfo['warning'] .= "\n" . 'Illegal APE tag present.';
}
// Page 1 - Stream Header
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$oggpageinfo = ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
if (ftell($fd) >= FREAD_BUFFER_SIZE) {
$ThisFileInfo['error'] .= "\n" . 'Could not find start of Ogg page in the first ' . FREAD_BUFFER_SIZE . ' bytes (this might not be an Ogg-Vorbis file?)';
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['ogg']);
return false;
}
$filedata = fread($fd, $oggpageinfo['page_length']);
$filedataoffset = 0;
if (substr($filedata, 0, 4) == 'fLaC') {
$ThisFileInfo['audio']['dataformat'] = 'flac';
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
} elseif (substr($filedata, 1, 6) == 'vorbis') {
$ThisFileInfo['audio']['dataformat'] = 'vorbis';
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, $filedataoffset, 6);
// hard-coded to 'vorbis'
$filedataoffset += 6;
$ThisFileInfo['ogg']['bitstreamversion'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['numberofchannels'] = LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['ogg']['numberofchannels'];
$ThisFileInfo['ogg']['samplerate'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
if ($ThisFileInfo['ogg']['samplerate'] == 0) {
$ThisFileInfo['error'] .= "\n" . 'Corrupt Ogg file: sample rate == zero';
return false;
}
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['ogg']['samplerate'];
$ThisFileInfo['ogg']['samples'] = 0;
// filled in later
$ThisFileInfo['ogg']['bitrate_average'] = 0;
// filled in later
$ThisFileInfo['ogg']['bitrate_max'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['bitrate_nominal'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['bitrate_min'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['blocksize_small'] = pow(2, LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xf);
$ThisFileInfo['ogg']['blocksize_large'] = pow(2, (LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xf0) >> 4);
$ThisFileInfo['ogg']['stop_bit'] = LittleEndian2Int(substr($filedata, $filedataoffset, 1));
// must be 1, marks end of packet
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
// overridden if actually abr
if ($ThisFileInfo['ogg']['bitrate_max'] == 4294967295.0) {
unset($ThisFileInfo['ogg']['bitrate_max']);
$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
}
if ($ThisFileInfo['ogg']['bitrate_nominal'] == 4294967295.0) {
unset($ThisFileInfo['ogg']['bitrate_nominal']);
}
if ($ThisFileInfo['ogg']['bitrate_min'] == 4294967295.0) {
unset($ThisFileInfo['ogg']['bitrate_min']);
$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
}
} elseif (substr($filedata, 0, 8) == 'Speex ') {
// http://www.speex.org/manual/node10.html
$ThisFileInfo['audio']['dataformat'] = 'speex';
$ThisFileInfo['mime_type'] = 'audio/speex';
$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_string'] = substr($filedata, $filedataoffset, 8);
// hard-coded to 'Speex '
$filedataoffset += 8;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version'] = substr($filedata, $filedataoffset, 20);
$filedataoffset += 20;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version_id'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['header_size'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode_bitstream_version'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['bitrate'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['framesize'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['frames_per_packet'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['extra_headers'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved1'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved2'] = LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['speex']['speex_version'] = trim($ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']);
$ThisFileInfo['speex']['sample_rate'] = $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'];
$ThisFileInfo['speex']['channels'] = $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'];
$ThisFileInfo['speex']['vbr'] = (bool) $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'];
$ThisFileInfo['speex']['band_type'] = SpeexBandModeLookup($ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']);
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['speex']['sample_rate'];
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['speex']['channels'];
if ($ThisFileInfo['speex']['vbr']) {
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
}
} else {
$ThisFileInfo['error'] .= "\n" . 'Expecting either "Speex " or "vorbis" identifier strings, found neither';
unset($ThisFileInfo['ogg']);
unset($ThisFileInfo['mime_type']);
return false;
}
// Page 2 - Comment Header
$oggpageinfo = ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
switch ($ThisFileInfo['audio']['dataformat']) {
case 'vorbis':
$filedata = fread($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = LittleEndian2Int(substr($filedata, 0, 1));
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, 1, 6);
// hard-coded to 'vorbis'
ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
break;
case 'flac':
require_once GETID3_INCLUDEPATH . 'getid3.flac.php';
if (!FLACparseMETAdata($fd, $ThisFileInfo)) {
$ThisFileInfo['error'] .= "\n" . 'Failed to parse FLAC headers';
return false;
}
break;
case 'speex':
fseek($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length'], SEEK_CUR);
ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
break;
}
// Last Page - Number of Samples
fseek($fd, max($ThisFileInfo['avdataend'] - FREAD_BUFFER_SIZE, 0), SEEK_SET);
$LastChunkOfOgg = strrev(fread($fd, FREAD_BUFFER_SIZE));
if ($LastOggSpostion = strpos($LastChunkOfOgg, 'SggO')) {
fseek($fd, 0 - ($LastOggSpostion + strlen('SggO')), SEEK_END);
$ThisFileInfo['avdataend'] = ftell($fd);
$ThisFileInfo['ogg']['pageheader']['eos'] = ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['samples'] = $ThisFileInfo['ogg']['pageheader']['eos']['pcm_abs_position'];
if ($ThisFileInfo['ogg']['samples'] == 0) {
$ThisFileInfo['error'] .= "\n" . 'Corrupt Ogg file: eos.number of samples == zero';
return false;
}
$ThisFileInfo['ogg']['bitrate_average'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / ($ThisFileInfo['ogg']['samples'] / $ThisFileInfo['audio']['sample_rate']);
}
if (isset($ThisFileInfo['ogg']['bitrate_average']) && $ThisFileInfo['ogg']['bitrate_average'] > 0) {
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['ogg']['bitrate_average'];
} elseif (isset($ThisFileInfo['ogg']['bitrate_nominal']) && $ThisFileInfo['ogg']['bitrate_nominal'] > 0) {
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['ogg']['bitrate_nominal'];
} elseif (isset($ThisFileInfo['ogg']['bitrate_min']) && isset($ThisFileInfo['ogg']['bitrate_max'])) {
$ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['ogg']['bitrate_min'] + $ThisFileInfo['ogg']['bitrate_max']) / 2;
}
if (isset($ThisFileInfo['audio']['bitrate']) && !isset($ThisFileInfo['playtime_seconds'])) {
if ($ThisFileInfo['audio']['bitrate'] == 0) {
$ThisFileInfo['error'] .= "\n" . 'Corrupt Ogg file: bitrate_audio == zero';
return false;
}
$ThisFileInfo['playtime_seconds'] = (double) (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['ogg']['vendor'])) {
$ThisFileInfo['audio']['encoder'] = preg_replace('/^Encoded with /', '', $ThisFileInfo['ogg']['vendor']);
}
return true;
}
function FLACparseMETAdata(&$fd, &$ThisFileInfo)
{
do {
$METAdataBlockOffset = ftell($fd);
$METAdataBlockHeader = fread($fd, 4);
$METAdataLastBlockFlag = (bool) (BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
$METAdataBlockType = BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7f;
$METAdataBlockLength = BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
$METAdataBlockTypeText = FLACmetaBlockTypeLookup($METAdataBlockType);
$ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['offset'] = $METAdataBlockOffset;
$ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['last_meta_block'] = $METAdataLastBlockFlag;
$ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_type'] = $METAdataBlockType;
$ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_type_text'] = $METAdataBlockTypeText;
$ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_length'] = $METAdataBlockLength;
$ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'] = fread($fd, $METAdataBlockLength);
$ThisFileInfo['avdataoffset'] = ftell($fd);
switch ($METAdataBlockTypeText) {
case 'STREAMINFO':
if (!FLACparseSTREAMINFO($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'PADDING':
// ignore
break;
case 'APPLICATION':
if (!FLACparseAPPLICATION($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'SEEKTABLE':
if (!FLACparseSEEKTABLE($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'VORBIS_COMMENT':
require_once GETID3_INCLUDEPATH . 'getid3.ogg.php';
//ParseVorbisComments($ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'], $ThisFileInfo, $METAdataBlockOffset, $fd);
$OldOffset = ftell($fd);
fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR);
ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
fseek($fd, $OldOffset, SEEK_SET);
break;
case 'CUESHEET':
if (!FLACparseCUESHEET($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
default:
$ThisFileInfo['warning'] .= "\n" . 'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $METAdataBlockType . ') at offset ' . $METAdataBlockOffset;
break;
}
} while ($METAdataLastBlockFlag === false);
if (isset($ThisFileInfo['flac']['STREAMINFO'])) {
$ThisFileInfo['flac']['compressed_audio_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
$ThisFileInfo['flac']['uncompressed_audio_bytes'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] * $ThisFileInfo['flac']['STREAMINFO']['channels'] * ($ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] / 8);
if ($ThisFileInfo['flac']['uncompressed_audio_bytes'] == 0) {
$ThisFileInfo['error'] .= "\n" . 'Corrupt FLAC file: uncompressed_audio_bytes == zero';
return false;
}
$ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes'];
}
// set md5_data - built into flac 0.5+
if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) {
if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat(chr(0), 16)) {
$ThisFileInfo['warning'] .= "\n" . 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC), using calculated md5_data';
} else {
$ThisFileInfo['md5_data'] = '';
$md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature'];
for ($i = 0; $i < strlen($md5); $i++) {
$ThisFileInfo['md5_data'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
}
if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data'])) {
unset($ThisFileInfo['md5_data']);
}
}
}
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
if (!empty($ThisFileInfo['ogg']['vendor'])) {
$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor'];
}
return true;
}
