CD_HEAD_SIZE      346 include/linux/cdrom.h #define CD_FRAMESIZE_RAW0 (CD_FRAMESIZE_RAW-CD_SYNC_SIZE-CD_HEAD_SIZE) /*2336*/
CD_HEAD_SIZE      348 include/linux/cdrom.h #define CD_XA_HEAD        (CD_HEAD_SIZE+CD_SUBHEAD_SIZE) /* "before data" part of raw XA frame */