MAXSPC
if (opt_b > bpb.bps * MAXSPC)
opt_b, bpb.bps * MAXSPC);
bpb.spc < MAXSPC &&
if (o.block_size > bpb.bps * MAXSPC) {
o.block_size, bpb.bps * MAXSPC);
bpb.spc < MAXSPC &&