MIDI 7-Bit Byte Calculator
SYSEX or NRPN getting you down? You’ve come to the right place. MIDI Designer’s Byte Calculator is the way to get your conversions done and get on with your MIDI life.
Converts from 7-bit MIDI bytes to values, or from values to 7-bit MIDI bytes.
> ($which * 7) & 0x7f;
return $value;
}
$FORM_NONE = 0;
$FORM_BYTES_TO_VALUE = 1;
$FORM_VALUE_TO_BYTES = 2;
$formToProcess = $FORM_NONE;
$result = "";
if ($_REQUEST["midi_bytes"])
$formToProcess = $FORM_BYTES_TO_VALUE;
else if ($_REQUEST["number_of_bytes"])
$formToProcess = $FORM_VALUE_TO_BYTES;
$lsb_first = $_REQUEST["lsb_first"] == "on" ? true : false;
$bytes = array();
if ($formToProcess == $FORM_BYTES_TO_VALUE) {
$midi_bytes = sanitize($_REQUEST["midi_bytes"]);
$bytesExploded = explode(" ", $midi_bytes);
$bytes = array();
foreach ($bytesExploded as $piece) {
$int_val = intval(hexdec($piece));
if (is_int($int_val))
$bytes[] = $int_val;
}
$numberOfBytes = count($bytes);
} else if ($formToProcess == $FORM_VALUE_TO_BYTES) {
$sum = intval($_REQUEST["sum"]);
$numberOfBytes = intval($_REQUEST["number_of_bytes"]);
$bytes = array();
if ($lsb_first) {
for ($i=0; $i<$numberOfBytes; $i++) {
$byte = sevenBitByte($sum, $i);
$bytes[] = $byte;
}
} else {
for ($i=$numberOfBytes-1; $i>=0; $i--) {
$byte = sevenBitByte($sum, $i);
$bytes[] = $byte;
}
}
}
$sum = 0;
$bytesAsString = "";
$i = $lsb_first ? 0 : $numberOfBytes - 1;
foreach ($bytes as $byte) {
$bit_shifted = $byte<<($i * 7);
$sum += $bit_shifted;
$result = $result . ($i+1) . ") 0x" . dechex($byte) . " = " . $byte . " decimal (" . $bit_shifted . ")
";
$bytesAsString = $bytesAsString . "" . dechex($byte). " ";
if ($lsb_first)
$i += 1;
else
$i -= 1;
}
if ($sum == 0)
$sum = "";
$bytesAsString = strtoupper($bytesAsString);
?>
Bytes to Value
Value to Bytes
Result
Total: 0