function FLACparseMETAdata(&$fd, &$ThisFileInfo)
{
do {
$METAdataBlockOffset = ftell($fd);
$METAdataBlockHeader = fread($fd, 4);
$METAdataLastBlockFlag = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
$METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7f;
$METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
$METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($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 ($METAdataBlockTypeText) {
case 'STREAMINFO':
if (!getid3_flac::FLACparseSTREAMINFO($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'PADDING':
// ignore
break;
case 'APPLICATION':
if (!getid3_flac::FLACparseAPPLICATION($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'SEEKTABLE':
if (!getid3_flac::FLACparseSEEKTABLE($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
case 'VORBIS_COMMENT':
$OldOffset = ftell($fd);
fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR);
getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
fseek($fd, $OldOffset, SEEK_SET);
break;
case 'CUESHEET':
if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) {
return false;
}
break;
default:
$ThisFileInfo['warning'][] = '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'][] = 'Corrupt FLAC file: uncompressed_audio_bytes == zero';
return false;
}
$ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes'];
}
// set md5_data_source - built into flac 0.5+
if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) {
if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat("", 16)) {
$ThisFileInfo['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)';
} else {
$ThisFileInfo['md5_data_source'] = '';
$md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature'];
for ($i = 0; $i < strlen($md5); $i++) {
$ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
}
if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) {
unset($ThisFileInfo['md5_data_source']);
}
}
}
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
if ($ThisFileInfo['audio']['bits_per_sample'] == 8) {
// special case
// must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
// MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
$ThisFileInfo['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file';
}
if (!empty($ThisFileInfo['ogg']['vendor'])) {
$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor'];
}
return true;
}
function getid3_ogg(&$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') {
$this->ParseVorbisPageHeader($filedata, $filedataoffset, $ThisFileInfo, $oggpageinfo);
} elseif (substr($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, $ThisFileInfo);
break;
}
// Last Page - Number of Samples
if (!getid3_lib::intValueSupported($ThisFileInfo['avdataend'])) {
$ThisFileInfo['warning'][] = 'Unable to parse Ogg end chunk file (PHP does not support file operations beyond ' . round(PHP_INT_MAX / 1073741824) . 'GB)';
} else {
fseek($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;
}
$ThisFileInfo['playtime_seconds'] = (double) (($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 FLACparseMETAdata()
{
$info =& $this->getid3->info;
do {
$METAdataBlockOffset = ftell($this->getid3->fp);
$METAdataBlockHeader = fread($this->getid3->fp, 4);
$METAdataLastBlockFlag = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
$METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7f;
$METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
$METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($METAdataBlockType);
if ($METAdataBlockLength < 0) {
$info['error'][] = 'corrupt or invalid METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $METAdataBlockType . ') at offset ' . $METAdataBlockOffset;
break;
}
$info['flac'][$METAdataBlockTypeText]['raw'] = array();
$ThisFileInfo_flac_METAdataBlockTypeText_raw =& $info['flac'][$METAdataBlockTypeText]['raw'];
$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'] = $METAdataBlockLength;
if ($METAdataBlockOffset + 4 + $METAdataBlockLength > $info['filesize']) {
$info['error'][] = 'METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $METAdataBlockType . ') at offset ' . $METAdataBlockOffset . ' extends beyond end of file';
break;
}
if ($METAdataBlockLength < 1) {
$info['error'][] = 'METADATA_BLOCK_HEADER.BLOCK_LENGTH (' . $METAdataBlockLength . ') at offset ' . $METAdataBlockOffset . ' is invalid';
break;
}
$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'] = fread($this->getid3->fp, $METAdataBlockLength);
$info['avdataoffset'] = ftell($this->getid3->fp);
switch ($METAdataBlockTypeText) {
case 'STREAMINFO':
// 0x00
if (!$this->FLACparseSTREAMINFO($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'PADDING':
// 0x01
// ignore
break;
case 'APPLICATION':
// 0x02
if (!$this->FLACparseAPPLICATION($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'SEEKTABLE':
// 0x03
if (!$this->FLACparseSEEKTABLE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'VORBIS_COMMENT':
// 0x04
$getid3_temp = new getID3();
$getid3_temp->openfile($this->getid3->filename);
$getid3_temp->info['avdataoffset'] = ftell($this->getid3->fp) - $METAdataBlockLength;
$getid3_temp->info['audio']['dataformat'] = 'flac';
$getid3_temp->info['flac'] = $info['flac'];
$getid3_ogg = new getid3_ogg($getid3_temp);
$getid3_ogg->ParseVorbisCommentsFilepointer();
$maybe_copy_keys = array('vendor', 'comments_raw', 'comments', 'replay_gain');
foreach ($maybe_copy_keys as $maybe_copy_key) {
if (!empty($getid3_temp->info['ogg'][$maybe_copy_key])) {
$info['ogg'][$maybe_copy_key] = $getid3_temp->info['ogg'][$maybe_copy_key];
}
}
if (!empty($getid3_temp->info['replay_gain'])) {
$info['replay_gain'] = $getid3_temp->info['replay_gain'];
}
unset($getid3_temp, $getid3_ogg);
break;
case 'CUESHEET':
// 0x05
if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'])) {
return false;
}
break;
case 'PICTURE':
// 0x06
if (!getid3_flac::FLACparsePICTURE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'])) {
return false;
}
break;
default:
$info['warning'][] = 'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $METAdataBlockType . ') at offset ' . $METAdataBlockOffset;
break;
}
} while ($METAdataLastBlockFlag === false);
if (isset($info['flac']['PICTURE'])) {
foreach ($info['flac']['PICTURE'] as $key => $valuearray) {
if (!empty($valuearray['image_mime']) && !empty($valuearray['data'])) {
$info['ogg']['comments']['picture'][] = array('image_mime' => $valuearray['image_mime'], 'data' => $valuearray['data']);
}
}
}
if (isset($info['flac']['STREAMINFO'])) {
$info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset'];
$info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8);
if ($info['flac']['uncompressed_audio_bytes'] == 0) {
$info['error'][] = 'Corrupt FLAC file: uncompressed_audio_bytes == zero';
return false;
}
$info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes'];
}
// set md5_data_source - built into flac 0.5+
if (isset($info['flac']['STREAMINFO']['audio_signature'])) {
if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("", 16)) {
$info['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)';
} else {
$info['md5_data_source'] = '';
$md5 = $info['flac']['STREAMINFO']['audio_signature'];
for ($i = 0; $i < strlen($md5); $i++) {
$info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
}
if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
unset($info['md5_data_source']);
}
}
}
$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
if ($info['audio']['bits_per_sample'] == 8) {
// special case
// must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
// MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
$info['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file';
}
if (!empty($info['ogg']['vendor'])) {
$info['audio']['encoder'] = $info['ogg']['vendor'];
}
return true;
}
