r property

num r

@override
num get r => numChannels > 0 ? Float16.float16ToDouble(data[_index + 0]) : 0;

void r=(num r)

@override
set r(num r) {
  if (numChannels > 0) {
    final d = r.toDouble();
    data[_index] = Float16.doubleToFloat16(d);
  }
}