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;
}
