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Devices:
cd.device
  CD_ADDCHANGEINT
  CD_ADDFRAMEINT
  CD_ATTENUATE
  CD_CHANGENUM
  CD_CHANGESTATE
  CD_CONFIG
  CD_EJECT
  CD_GETGEOMETRY
  CD_INFO
  CD_MOTOR
  CD_PAUSE
  CD_PLAYLSN
  CD_PLAYMSF
  CD_PLAYTRACK
  CD_PROTSTATUS
  CD_QCODELSN
  CD_QCODEMSF
  CD_READ
  CD_READXL
  CD_REMCHANGEINT
  CD_REMFRAMEINT
  CD_SEARCH
  CD_SEEK
  CD_TOCLSN
  CD_TOCMSF
  CloseDevice
  OpenDevice
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Docs » Autodocs » cd.device » CD_QCODELSN

NAME

       CD_QCODELSN -- Report current disk position.
   IO REQUEST
       io_Device       preset by the call to OpenDevice()
       io_Unit         preset by the call to OpenDevice()
       io_Command      CD_QCODELSN
       io_Data         pointer to QCode structure
       io_Length       0 - MUST be zero (for future compatability)

RESULT

       io_Error        0 for success, or an error code as defined in
                       <devices/cd.h>

FUNCTION

       This command reports current subcode Q channel time information.  This
       command only returns data when CD Audio is playing (or paused).  At
       any other time, an error is returned.  The Q-Code packet consists of:
       struct QCode {
           UBYTE        CtlAdr;        /* Data type / QCode type           */
           UBYTE        Track;         /* Track number                     */
           UBYTE        Index;         /* Track subindex number            */
           UBYTE        Zero;          /* The "Zero" byte of Q-Code packet */
           union LSNMSF TrackPosition; /* Position from start of track     */
           union LSNMSF DiskPosition;  /* Position from start of disk      */
           };

EXAMPLE

       struct QCode qcode;
       ior->io_Command = CD_QCODELSN;  /* Retrieve TOC information */
       ior->io_Length  = 0;            /* MUST be zero             */
       ior->io_Data    = (APTR)qcode;  /* Here's where we want it  */
       DoIO (ior);
       if (!ior->io_Error) {           /* Command succeeded        */
           printf("Current position is: %ld\n", qcode.DiskPosition.LSN);
           }

NOTES

       This function may not return immediately.  It may take several frames
       to pass by before a valid Q-Code packet can be returned.  Use SendIO()
       and CheckIO() if response time is critical, and the information is
       not.

NAME

RESULT

FUNCTION

EXAMPLE

NOTES

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