Asymmetric Pileup (ASP)

Asymmetric Pileup (ASP) is a new pileup file format that we created to replace GLF.

ASP File Format

ASP files are binary files consisting of 4 types of records. Every record starts with a 1-byte field that indicates the type.

Type Value	Record Type	Description
0	Empty	indicates there are no bases for this position.
1	Position Only	specifies the chromsome id/0-based position of the next record (other records do not contain a position).
2	Reference Only	indicates that all bases at this position match the reference and provides the number of bases, GLH, and GLA.
3	Detailed	indicates that not all bases at this position match the reference and provides the number of bases, the bases, the qualities, the cycles, the strands, and the MQs.