private function makeEighthNoteBytes(TimeSignature $timeSignature)
{
$bytes = array(0, 0, 0, 0);
if ($timeSignature->getDenominator()->getValue() <= Duration::EIGHTH) {
$eighthsInDenominator = intval(Duration::EIGHTH / $timeSignature->getDenominator()->getValue());
$total = $eighthsInDenominator * $timeSignature->getNumerator();
$byteValue = intval($total / 4);
$missingValue = $total - 4 * $byteValue;
for ($i = 0; $i < count($bytes); $i++) {
$bytes[$i] = $byteValue;
}
if ($missingValue > 0) {
$bytes[0] += $missingValue;
}
}
return $bytes;
}
private function writeMeasureHeader(MeasureHeader $measure, TimeSignature $timeSignature)
{
$flags = 0;
if ($measure->getNumber() == 1 || $measure->getTimeSignature()->getNumerator() != $timeSignature->getNumerator()) {
$flags |= 0x1;
}
if ($measure->getNumber() == 1 || $measure->getTimeSignature()->getDenominator()->getValue() != $timeSignature->getDenominator()->getValue()) {
$flags |= 0x2;
}
if ($measure->isRepeatOpen()) {
$flags |= 0x4;
}
if ($measure->getRepeatClose() > 0) {
$flags |= 0x8;
}
if ($measure->hasMarker()) {
$flags |= 0x20;
}
$this->writeUnsignedByte($flags);
if (($flags & 0x1) != 0) {
$this->writeByte($measure->getTimeSignature()->getNumerator());
}
if (($flags & 0x2) != 0) {
$this->writeByte($measure->getTimeSignature()->getDenominator()->getValue());
}
if (($flags & 0x8) != 0) {
$this->writeByte($measure->getRepeatClose());
}
if (($flags & 0x20) != 0) {
$this->writeMarker($measure->getMarker());
}
}
public static function timeSignature(TimeSignature $timeSignature)
{
$message = new MidiMessage(MidiMessage::TYPE_META, MidiMessage::TIME_SIGNATURE_CHANGE);
$message->setData(array($timeSignature->getNumerator(), $timeSignature->getDenominator()->getIndex(), 96 / $timeSignature->getDenominator()->getValue(), 8));
return $message;
}
