private function writeTrack(MidiTrack $track)
{
$length = 0;
$this->writeInt(MidiReader::TRACK_MAGIC);
$previous = null;
for ($i = 0; $i < $track->countEvents(); $i++) {
$event = $track->get($i);
$length += $this->writeEvent($event, $previous);
$previous = $event;
}
return $length;
}
private function readTrack(MidiTrack $track)
{
while (true) {
if ($this->readInt() == MidiReaderInterface::TRACK_MAGIC) {
break;
}
$chunkLength = $this->readInt();
if ($chunkLength % 2 != 0) {
$chunkLength++;
}
$this->skip($chunkLength);
}
$helper = new MidiTrackReaderHelper(0, $this->readInt(), -1);
while ($helper->remainingBytes > 0) {
$helper->ticks += $this->readVariableLengthQuantity($helper);
$event = $this->readEvent($helper);
if ($event !== null) {
$track->add($event);
}
}
}
