format  Sint32 STM_GetNumCdbuf (StmHn stm)
 Input  stm: Stream handle
 Output  None
 Function value  Number of sectors in CD buffer section
 Function  Gets the number of sectors read in the CD buffer section. 

  format  Bool STM_GetSctInfo (StmHn stm, Sint32 spos, StmSct * sinfo)
 Input  stm: Stream handle
:  spos: Sector position (first sector is STM_CDBUF_TOP)
 Output  sinfo: Sector information
 Function value  TRUE: There is a specified sector
  FALSE: No specified sector
 Function  Information on the sector read into the CD buffer section is acquired. 

  format  Sint32 STM_GetLenTrBuf (StmHn stm)
 Input  stm: Stream handle
 Output  None
 Function value  Number of data (in word units)
 Function  Acquires the data count (word count) in the transfer area. 

  format  Bool STM_IsTrBufFull (StmHn stm)
 Input  stm: Stream handle
 Output  None
 Function value  TRUE: When the size of the transfer area has been reached
:  FALSE: If the transfer area size has not been reached
 Function  Checks whether the number of data in the transfer area has reached the size of the area.
 Remarks  STM_ResetTrBuf can be used to reset the transfer area.