BoxParser.createFullBoxCtor("prdi", "ProgressiveDerivedImageItemInformationProperty", function(stream) {
this.step_count = stream.readUint16();
this.item_count = [];
if (this.flags & 0x2) {
for (var i = 0; i < this.step_count; i++) {
this.item_count[i] = stream.readUint16();
}
}
});