Format  Sint32 CDC_CdPlay (CdcPly * ply)
 Input  ply: Playback parameter
 Output  None
 Function value  Returns an error code.
 Function  Plays the CD according to the specified playback parameters.
  Music is played in the CD-DA area and sector data is read in the CD-ROM area.
 Do not play back the gap / pause area at the boundary between CD-ROM and CD-DA.
 Note SCSP settings are required to play CD-DA and actually output audio. For setting method
Refer to the SCSP manual for details. 
 Remarks  When playing CD-DA, the mute is canceled 4 frames before the start position to prevent the song from being cut off. 

 Example   (1) Frame address specification 
  Sint32 ret;
 C 
 CdcPly plywk, * ply = & plywk; / * Definition of playback parameter variable * /
  CDC_PLY_STYPE (ply) = CDC_PTYPE_FAD;
  CDC_PLY_SFAD (ply) = fad; / * Start frame address * /
  CDC_PLY_ETYPE (ply) = CDC_PTYPE_FAD;
:  CDC_PLY_EFAS (ply) = fasnum; / * number of frame address sectors * /
:  CDC_PLY_PMODE (ply) = pmode; / * Playback mode * /
  ret = CDC_CdPlay (ply); / * Start playback * / 

   (2) Track / index specification 
  CdcPly plywk, * ply = & plywk;
  CDC_PLY_STYPE (ply) = CDC_PTYPE_TNO;
  CDC_PLY_STNO (ply) = tno1; / * Start track number * /
:  CDC_PLY_SIDX (ply) = x1; / * Start index number * /
  CDC_PLY_ETYPE (ply) = CDC_PTYPE_TNO;
:  CDC_PLY_ETNO (ply) = tno2; / * End track number * /
:  CDC_PLY_EIDX (ply) = x2; / * End index number * /
  CDC_PLY_PMODE (ply) = pmode; / * Playback mode * /
  ret = CDC_CdPlay (ply); 

   (3) Specifying default values ​​
  CdcPly plywk, * ply = & plywk;
:  CDC_PLY_STYPE (ply) = CDC_PTYPE_DFL; / * The start position is the top of the disc * /
  CDC_PLY_ETYPE (ply) = CDC_PTYPE_DFL; / * End position is the end of the disc * /
:  CDC_PLY_PMODE (ply) = CDC_PM_DFL; / * No repeat, move pickup * /
  ret = CDC_CdPlay (ply); 

   (4) Resume CD playback (unchanged designation: playback from the current position) ... Pause cancellation 
  CdcPly plywk, * ply = & plywk;
  CDC_PLY_STYPE (ply) = CDC_PTYPE_NOCHG;
  CDC_PLY_ETYPE (ply) = CDC_PTYPE_NOCHG;
  CDC_PLY_PMODE (ply) = CDC_PM_NOCHG;
  ret = CDC_CdPlay (ply);