Файл: F12/getid3/module.audio.ogg.php
Строк: 863
<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.ogg.php //
// module for analyzing Ogg Vorbis, OggFLAC and Speex files //
// dependencies: module.audio.flac.php //
// ///
/////////////////////////////////////////////////////////////////
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.flac.php', __FILE__, true);
class getid3_ogg
{
function getid3_ogg(&$fd, &$ThisFileInfo) {
$ThisFileInfo['fileformat'] = 'ogg';
// Warn about illegal tags - only vorbiscomments are allowed
if (isset($ThisFileInfo['id3v2'])) {
$ThisFileInfo['warning'][] = 'Illegal ID3v2 tag present.';
}
if (isset($ThisFileInfo['id3v1'])) {
$ThisFileInfo['warning'][] = 'Illegal ID3v1 tag present.';
}
if (isset($ThisFileInfo['ape'])) {
$ThisFileInfo['warning'][] = 'Illegal APE tag present.';
}
// Page 1 - Stream Header
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$oggpageinfo = getid3_ogg::ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
if (ftell($fd) >= GETID3_FREAD_BUFFER_SIZE) {
$ThisFileInfo['error'][] = 'Could not find start of Ogg page in the first '.GETID3_FREAD_BUFFER_SIZE.' bytes (this might not be an Ogg-Vorbis file?)';
unset($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';
$ThisFileInfo['audio']['lossless'] = true;
} elseif (substr($filedata, 1, 6) == 'vorbis') {
$ThisFileInfo['audio']['dataformat'] = 'vorbis';
$ThisFileInfo['audio']['lossless'] = false;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::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;
$ThisFileInfo['ogg']['bitstreamversion'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['numberofchannels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
$filedataoffset += 1;
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['ogg']['numberofchannels'];
$ThisFileInfo['ogg']['samplerate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
if ($ThisFileInfo['ogg']['samplerate'] == 0) {
$ThisFileInfo['error'][] = '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
$ThisFileInfo['ogg']['bitrate_max'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['bitrate_nominal'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['bitrate_min'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['blocksize_small'] = pow(2, getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0x0F);
$ThisFileInfo['ogg']['blocksize_large'] = pow(2, (getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xF0) >> 4);
$ThisFileInfo['ogg']['stop_bit'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)); // must be 1, marks end of packet
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; // overridden if actually abr
if ($ThisFileInfo['ogg']['bitrate_max'] == 0xFFFFFFFF) {
unset($ThisFileInfo['ogg']['bitrate_max']);
$ThisFileInfo['audio']['bitrate_mode'] = 'abr';
}
if ($ThisFileInfo['ogg']['bitrate_nominal'] == 0xFFFFFFFF) {
unset($ThisFileInfo['ogg']['bitrate_nominal']);
}
if ($ThisFileInfo['ogg']['bitrate_min'] == 0xFFFFFFFF) {
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['audio']['lossless'] = false;
$ThisFileInfo['ogg']['pageheader'][$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'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['header_size'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode_bitstream_version'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['bitrate'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['framesize'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['frames_per_packet'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['extra_headers'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved1'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
$filedataoffset += 4;
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved2'] = getid3_lib::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'];
$ThisFileInfo['speex']['band_type'] = getid3_ogg::SpeexBandModeLookup($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 {
$ThisFileInfo['error'][] = 'Expecting either "Speex " or "vorbis" identifier strings, found neither';
unset($ThisFileInfo['ogg']);
unset($ThisFileInfo['mime_type']);
return false;
}
// Page 2 - Comment Header
$oggpageinfo = getid3_ogg::ParseOggPageHeader($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'] = getid3_lib::LittleEndian2Int(substr($filedata, 0, 1));
$ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, 1, 6); // hard-coded to 'vorbis'
getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
break;
case 'flac':
if (!getid3_flac::FLACparseMETAdata($fd, $ThisFileInfo)) {
$ThisFileInfo['error'][] = 'Failed to parse FLAC headers';
return false;
}
break;
case 'speex':
fseek($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length'], SEEK_CUR);
getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
break;
}
// Last Page - Number of Samples
fseek($fd, max($ThisFileInfo['avdataend'] - GETID3_FREAD_BUFFER_SIZE, 0), SEEK_SET);
$LastChunkOfOgg = strrev(fread($fd, GETID3_FREAD_BUFFER_SIZE));
if ($LastOggSpostion = strpos($LastChunkOfOgg, 'SggO')) {
fseek($fd, $ThisFileInfo['avdataend'] - ($LastOggSpostion + strlen('SggO')), SEEK_SET);
$ThisFileInfo['avdataend'] = ftell($fd);
$ThisFileInfo['ogg']['pageheader']['eos'] = getid3_ogg::ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['samples'] = $ThisFileInfo['ogg']['pageheader']['eos']['pcm_abs_position'];
if ($ThisFileInfo['ogg']['samples'] == 0) {
$ThisFileInfo['error'][] = 'Corrupt Ogg file: eos.number of samples == zero';
return false;
}
$ThisFileInfo['ogg']['bitrate_average'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / ($ThisFileInfo['ogg']['samples'] / $ThisFileInfo['audio']['sample_rate']);
}
if (!empty($ThisFileInfo['ogg']['bitrate_average'])) {
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['ogg']['bitrate_average'];
} elseif (!empty($ThisFileInfo['ogg']['bitrate_nominal'])) {
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['ogg']['bitrate_nominal'];
} elseif (!empty($ThisFileInfo['ogg']['bitrate_min']) && !empty($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'][] = 'Corrupt Ogg file: bitrate_audio == zero';
return false;
}
$ThisFileInfo['playtime_seconds'] = (float) ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['ogg']['vendor'])) {
$ThisFileInfo['audio']['encoder'] = preg_replace('/^Encoded with /', '', $ThisFileInfo['ogg']['vendor']);
// Vorbis only
if ($ThisFileInfo['audio']['dataformat'] == 'vorbis') {
// Vorbis 1.0 starts with Xiph.Org
if (preg_match('/^Xiph.Org/', $ThisFileInfo['audio']['encoder'])) {
if ($ThisFileInfo['audio']['bitrate_mode'] == 'abr') {
// Set -b 128 on abr files
$ThisFileInfo['audio']['encoder_options'] = '-b '.round($ThisFileInfo['ogg']['bitrate_nominal'] / 1000);
} elseif (($ThisFileInfo['audio']['bitrate_mode'] == 'vbr') && ($ThisFileInfo['audio']['channels'] == 2) && ($ThisFileInfo['audio']['sample_rate'] >= 44100) && ($ThisFileInfo['audio']['sample_rate'] <= 48000)) {
// Set -q N on vbr files
$ThisFileInfo['audio']['encoder_options'] = '-q '.$this->get_quality_from_nominal_bitrate($ThisFileInfo['ogg']['bitrate_nominal']);
}
}
if (empty($ThisFileInfo['audio']['encoder_options']) && !empty($ThisFileInfo['ogg']['bitrate_nominal'])) {
$ThisFileInfo['audio']['encoder_options'] = 'Nominal bitrate: '.intval(round($ThisFileInfo['ogg']['bitrate_nominal'] / 1000)).'kbps';
}
}
}
return true;
}
function ParseOggPageHeader(&$fd) {
// http://xiph.org/ogg/vorbis/doc/framing.html
$oggheader['page_start_offset'] = ftell($fd); // where we started from in the file
$filedata = fread($fd, GETID3_FREAD_BUFFER_SIZE);
$filedataoffset = 0;
while ((substr($filedata, $filedataoffset++, 4) != 'OggS')) {
if ((ftell($fd) - $oggheader['page_start_offset']) >= GETID3_FREAD_BUFFER_SIZE) {
// should be found before here
return false;
}
if ((($filedataoffset + 28) > strlen($filedata)) || (strlen($filedata) < 28)) {
if (feof($fd) || (($filedata .= fread($fd, GETID3_FREAD_BUFFER_SIZE)) === false)) {
// 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'] + $oggheader['page_length'];
fseek($fd, $oggheader['header_end_offset'], SEEK_SET);
return $oggheader;
}
function ParseVorbisCommentsFilepointer(&$fd, &$ThisFileInfo) {
$OriginalOffset = ftell($fd);
$CommentStartOffset = $OriginalOffset;
$commentdataoffset = 0;
$VorbisCommentPage = 1;
switch ($ThisFileInfo['audio']['dataformat']) {
case 'vorbis':
$CommentStartOffset = $ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage]['page_start_offset']; // Second Ogg page, after header block
fseek($fd, $CommentStartOffset, SEEK_SET);
$commentdataoffset = 27 + $ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage]['page_segments'];
$commentdata = fread($fd, getid3_ogg::OggPageSegmentLength($ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage], 1) + $commentdataoffset);
$commentdataoffset += (strlen('vorbis') + 1);
break;
case 'flac':
fseek($fd, $ThisFileInfo['flac']['VORBIS_COMMENT']['raw']['offset'] + 4, SEEK_SET);
$commentdata = fread($fd, $ThisFileInfo['flac']['VORBIS_COMMENT']['raw']['block_length']);
break;
case 'speex':
$CommentStartOffset = $ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage]['page_start_offset']; // Second Ogg page, after header block
fseek($fd, $CommentStartOffset, SEEK_SET);
$commentdataoffset = 27 + $ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage]['page_segments'];
$commentdata = fread($fd, getid3_ogg::OggPageSegmentLength($ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage], 1) + $commentdataoffset);
break;
default:
return false;
break;
}
$VendorSize = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
$commentdataoffset += 4;
$ThisFileInfo['ogg']['vendor'] = substr($commentdata, $commentdataoffset, $VendorSize);
$commentdataoffset += $VendorSize;
$CommentsCount = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
$commentdataoffset += 4;
$ThisFileInfo['avdataoffset'] = $CommentStartOffset + $commentdataoffset;
$basicfields = array('TITLE', 'ARTIST', 'ALBUM', 'TRACKNUMBER', 'GENRE', 'DATE', 'DESCRIPTION', 'COMMENT');
for ($i = 0; $i < $CommentsCount; $i++) {
$ThisFileInfo['ogg']['comments_raw'][$i]['dataoffset'] = $CommentStartOffset + $commentdataoffset;
if (ftell($fd) < ($ThisFileInfo['ogg']['comments_raw'][$i]['dataoffset'] + 4)) {
$VorbisCommentPage++;
$oggpageinfo = getid3_ogg::ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['pageheader'][$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 + $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
$commentdataoffset += (27 + $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
// Finally, stick the unused data back on the end
$commentdata .= $AsYetUnusedData;
//$commentdata .= fread($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
$commentdata .= fread($fd, getid3_ogg::OggPageSegmentLength($ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage], 1));
}
$ThisFileInfo['ogg']['comments_raw'][$i]['size'] = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
// replace avdataoffset with position just after the last vorbiscomment
$ThisFileInfo['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'] > $ThisFileInfo['avdataend']) || ($ThisFileInfo['ogg']['comments_raw'][$i]['size'] < 0)) {
$ThisFileInfo['error'][] = 'Invalid Ogg comment size (comment #'.$i.', claims to be '.number_format($ThisFileInfo['ogg']['comments_raw'][$i]['size']).' bytes) - aborting reading comments';
break 2;
}
$VorbisCommentPage++;
$oggpageinfo = getid3_ogg::ParseOggPageHeader($fd);
$ThisFileInfo['ogg']['pageheader'][$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 + $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
$commentdataoffset += (27 + $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
// Finally, stick the unused data back on the end
$commentdata .= $AsYetUnusedData;
//$commentdata .= fread($fd, $ThisFileInfo['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
$commentdata .= fread($fd, getid3_ogg::OggPageSegmentLength($ThisFileInfo['ogg']['pageheader'][$VorbisCommentPage], 1));
//$filebaseoffset += $oggpageinfo['header_end_offset'] - $oggpageinfo['page_start_offset'];
}
$commentstring = substr($commentdata, $commentdataoffset, $ThisFileInfo['ogg']['comments_raw'][$i]['size']);
$commentdataoffset += $ThisFileInfo['ogg']['comments_raw'][$i]['size'];
if (!$commentstring) {
// no comment?
$ThisFileInfo['warning'][] = 'Blank Ogg comment ['.$i.']';
} elseif (strstr($commentstring, '=')) {
$commentexploded = explode('=', $commentstring, 2);
$ThisFileInfo['ogg']['comments_raw'][$i]['key'] = strtoupper($commentexploded[0]);
$ThisFileInfo['ogg']['comments_raw'][$i]['value'] = @$commentexploded[1];
$ThisFileInfo['ogg']['comments_raw'][$i]['data'] = base64_decode($ThisFileInfo['ogg']['comments_raw'][$i]['value']);
$ThisFileInfo['ogg']['comments'][strtolower($ThisFileInfo['ogg']['comments_raw'][$i]['key'])][] = $ThisFileInfo['ogg']['comments_raw'][$i]['value'];
$imagechunkcheck = getid3_lib::GetDataImageSize($ThisFileInfo['ogg']['comments_raw'][$i]['data']);
$ThisFileInfo['ogg']['comments_raw'][$i]['image_mime'] = getid3_lib::image_type_to_mime_type($imagechunkcheck[2]);
if (!$ThisFileInfo['ogg']['comments_raw'][$i]['image_mime'] || ($ThisFileInfo['ogg']['comments_raw'][$i]['image_mime'] == 'application/octet-stream')) {
unset($ThisFileInfo['ogg']['comments_raw'][$i]['image_mime']);
unset($ThisFileInfo['ogg']['comments_raw'][$i]['data']);
}
} else {
$ThisFileInfo['warning'][] = '[known problem with CDex >= v1.40, < v1.50b7] Invalid Ogg comment name/value pair ['.$i.']: '.$commentstring;
}
}
// Replay Gain Adjustment
// http://privatewww.essex.ac.uk/~djmrob/replaygain/
if (isset($ThisFileInfo['ogg']['comments']) && is_array($ThisFileInfo['ogg']['comments'])) {
foreach ($ThisFileInfo['ogg']['comments'] as $index => $commentvalue) {
switch ($index) {
case 'rg_audiophile':
case 'replaygain_album_gain':
$ThisFileInfo['replay_gain']['album']['adjustment'] = (double) $commentvalue[0];
unset($ThisFileInfo['ogg']['comments'][$index]);
break;
case 'rg_radio':
case 'replaygain_track_gain':
$ThisFileInfo['replay_gain']['track']['adjustment'] = (double) $commentvalue[0];
unset($ThisFileInfo['ogg']['comments'][$index]);
break;
case 'replaygain_album_peak':
$ThisFileInfo['replay_gain']['album']['peak'] = (double) $commentvalue[0];
unset($ThisFileInfo['ogg']['comments'][$index]);
break;
case 'rg_peak':
case 'replaygain_track_peak':
$ThisFileInfo['replay_gain']['track']['peak'] = (double) $commentvalue[0];
unset($ThisFileInfo['ogg']['comments'][$index]);
break;
default:
// do nothing
break;
}
}
}
fseek($fd, $OriginalOffset, SEEK_SET);
return true;
}
function SpeexBandModeLookup($mode) {
static $SpeexBandModeLookup = array();
if (empty($SpeexBandModeLookup)) {
$SpeexBandModeLookup[0] = 'narrow';
$SpeexBandModeLookup[1] = 'wide';
$SpeexBandModeLookup[2] = 'ultra-wide';
}
return (isset($SpeexBandModeLookup[$mode]) ? $SpeexBandModeLookup[$mode] : null);
}
function OggPageSegmentLength($OggInfoArray, $SegmentNumber=1) {
for ($i = 0; $i < $SegmentNumber; $i++) {
$segmentlength = 0;
foreach ($OggInfoArray['segment_table'] as $key => $value) {
$segmentlength += $value;
if ($value < 255) {
break;
}
}
}
return $segmentlength;
}
function get_quality_from_nominal_bitrate($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
}
}
?>