function parse($mfidata)
{
$reader = new IO_Bit();
$reader->input($mfidata);
// Header Part
$identifier = $reader->getData(4);
if ($identifier != 'melo') {
throw new Exception('Identifer($identifier) is not melo');
}
$this->headers['Identifier'] = $identifier;
$fileLength = $reader->getUI32BE();
$realFileLength = strlen($mfidata);
if ($fileLength != $realFileLength - 8) {
throw new Exception("FileLength({$fileLength}) is not real FileLength({$realFileLength}) - 8");
}
$this->headers['FileLength'] = $fileLength;
$offsetToTrack = $reader->getUI16BE();
$this->headers['OffsetToTrack'] = $offsetToTrack;
$this->headers['DataTypeMajor'] = $reader->getUI8();
$this->headers['DataTypeMinor'] = $reader->getUI8();
$this->headers['NumberOfTrack'] = $reader->getUI8();
// Data Information Part
$reader_di = new IO_Bit();
$reader_di->input($reader->getData($offsetToTrack - 3));
$note_message_length_info = 0;
while ($reader_di->hasNextData(6)) {
$info = array();
$identifer = $reader_di->getData(4);
$length = $reader_di->getUI16BE();
$info['Identifer'] = $identifer;
$info['Length'] = $length;
switch ($identifer) {
case 'titl':
case 'copy':
case 'prot':
case 'date':
$data = $reader_di->getData($length);
break;
case 'sorc':
$data = $reader_di->getUI8($length);
break;
case 'note':
case 'exst':
$data = $reader_di->getUI16BE($length);
if ($identifer == 'note') {
$note_message_length_info = $data;
}
break;
case 'vers':
$data = $reader_di->getUI32BE($length);
break;
}
$info['Data'] = $data;
$this->datainfos[] = $info;
}
// Track Part
while ($reader->hasNextData(8)) {
$track = array();
$track['Identifer'] = $reader->getData(4);
$length = $reader->getUI32BE();
$track['Length'] = $length;
$reader_ev = new IO_Bit();
$reader_ev->input($reader->getData($length));
$track['Events'] = array();
while ($reader_ev->hasNextData(3)) {
$event = array();
$event['DeltaTime'] = $reader_ev->getUI8();
$statusInfo = $reader_ev->getUI8();
$event['StatusInfo'] = $statusInfo;
switch ($statusInfo) {
default:
$event['Data'] = $reader_ev->getUI8();
if ($note_message_length_info == 1) {
// MFi2
$event['Data2'] = $reader_ev->getUI8();
}
break;
case 0xff:
$statusInfo2 = $reader_ev->getUI8();
$event['StatusInfo2'] = $statusInfo2;
switch ($statusInfo2) {
default:
$event['Data'] = $reader_ev->getUI8();
break;
case 0xf0:
case 0xf1:
case 0xff:
$length = $reader_ev->getUI16BE();
$event['Length'] = $length;
$event['Data'] = $reader_ev->getData($length);
break;
}
}
$track['Events'][] = $event;
}
$this->tracks[] = $track;
}
}
function parseDataChunks(&$reader)
{
$chunks = array();
while ($reader->hasNextData(8)) {
$chunk = array();
$chunkID = $reader->getData(4);
$size = $reader->getUI32BE();
$chunk['ID'] = $chunkID;
$chunkID_3byte = substr($chunkID, 0, 3);
$chunkID_4th_value = ord($chunkID[3]);
switch ($chunkID_3byte) {
case 'Dch':
$chunk['ID'] = $chunkID_3byte;
$chunk['CodeType'] = $chunkID_4th_value;
break;
case 'MTR':
case 'ATR':
case 'GTR':
$chunk['ID'] = $chunkID_3byte;
$chunk['TrackNumber'] = $chunkID_4th_value;
break;
}
$chunk['Size'] = $size;
switch (substr($chunkID, 0, 3)) {
case 'CNT':
// CNTI: Contents Information Chunk
$chunk['Contents Class'] = $reader->getUI8();
$chunk['Contents Type'] = $reader->getUI8();
$chunk['Contents Code Type'] = $reader->getUI8();
$chunk['Copy Status'] = $reader->getUI8();
$chunk['Copy Counts'] = $reader->getUI8();
if ($size > 5) {
$chunk['Option'] = $reader->getData($size - 5);
}
break;
case 'MTR':
// MTR*: Score Track Chunk
$chunk['Format Type'] = $reader->getUI8();
$chunk['Sequence Type'] = $reader->getUI8();
$chunk['Timebase D'] = $reader->getUI8();
$chunk['Timebase G'] = $reader->getUI8();
$chunk['Channnel Status'] = $reader->getUI16BE();
$data = $reader->getData($size - 6);
$reader_chunkdata = new IO_Bit();
$reader_chunkdata->input($data);
$this->seekToAlphabet($reader_chunkdata);
$chunk[$structure_type] = $this->parseDataChunks($reader_chunkdata);
break;
case 'Mts':
// Mtsu, Mtsq, Mts
$data = $reader->getData($size);
$reader_tracks = new IO_Bit();
$reader_tracks->input($data);
switch ($chunkID) {
case 'Mtsu':
// Score Track Setup Data
// Score Track Setup Data
case 'Mtsq':
// Score Track Sequence Data
$tracks = array();
while ($reader_tracks->hasNextData(4)) {
$end_check = $reader_tracks->getUI32BE();
if ($end_check == 0) {
break;
}
$reader_tracks->incrementOffset(-4, 0);
$track = array();
// Duration
if ($chunkID != 'Mtsu') {
// Mtsu は Duration 無し
$duration = $reader_tracks->getUI8();
if ($duration & 0x80) {
$duration = ($duration & 0x7f) << 8;
$duration |= $reader_tracks->getUI8();
}
$track['Duration'] = $duration;
}
// Event
$event = $reader_tracks->getUI8();
$eventData = array();
if ($event != 0) {
$eventData['Type'] = 'Note Message';
$eventData['GetTime'] = $reader_tracks->getUI8();
// Option ???
} else {
$data1 = $reader_tracks->getUI8();
$eventData['Channel'] = $data1 >> 6;
if (($data1 & 0xf) == 0) {
$eventData['Type'] = 'Program change';
} elseif (($data1 & 0xf) == 1) {
$eventData['Type'] = 'Bank Select';
} else {
$msg = sprintf("Unknow Event Data#1=0x%02x", $data1);
// throw new Exception($msg);
printf($msg . "\n");
break 2;
}
$eventData['Value'] = $reader_tracks->getUI8();
}
$track['event'] = $tracks[] = $track;
}
$chunk['Tracks'] = $tracks;
break 2;
}
default:
$data = $reader->getData($size);
if ($structure_type = $this->nestedChunkIDSize($chunkID)) {
$reader_chunkdata = new IO_Bit();
$reader_chunkdata->input($data);
$method = 'parseData' . $structure_type;
$chunk[$structure_type] = $this->{$method}($reader_chunkdata);
} else {
$chunk['Data'] = $data;
}
break;
}
// var_dump($chunk);
$chunks[] = $chunk;
}
return $chunks;
}