case 'o': fn_out = strdup(optarg); break;
case 'u': assert(is_bamout == 1); compress_level = 0; break;
case '1': assert(is_bamout == 1); compress_level = 1; break;
case 'o': fn_out = strdup(optarg); break;
case 'u': assert(is_bamout == 1); compress_level = 0; break;
case '1': assert(is_bamout == 1); compress_level = 1; break;