Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: David Tin Nyo <memex@teleport.com>
Newsgroups: scea.yaroze.programming.sound
Subject: Bug in CdPlay() ?
Date: Sat, 11 Oct 1997 16:28:47 -0700
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I've been trying to write a simple cd player
using the CdPlay() function and I've been noticing
some problems with this function on music-only CDs.

My basically looks like this (pseudocode in << >> for
clarity):

int tracks[100];

main()
{
 int i;
 trackindex = 0;

 // set tracks list to be 1-99,0
 for (i=0;i<99;i++) tracks[i] = i+1;
 tracks[99] = 0;
 CdPlay(2,tracks,trackindex);
 while ( <<start button not pressed>> ) {
     // get the current track index
     trackindex = CdPlay(3,tracks,trackindex);
     // check for user track change
     if ( <<direction pad left>> && trackindex>0 ) { 	
          trackindex--;
          CdPlay(2,tracks,trackindex);
     }
     if ( <<direction pad right>> && trackindex<98 ) {
          trackindex++;
          CdPlay(2,tracks,trackindex);
 }
 };

I've left out some code for clarity (such as debouncing) but
this is the basic layout.

This program works for playing audio tracks on all the
games I own with music tracks, but on certain music CDs
some tracks will not play.  If I advance to some tracks
the player skips on to the next track.

One music CD this can be seen on is the WipeOut XL soundtrack
album (not the game).  Track 3 skips to Track 4 and tracks 8-13
are unplayable with this program.

Is this a problem with the CdPlay() function?  I can't see how it
could be a problem with my code because other discs/tracks play
fine.  (Note: I have no problem playing any tracks with the
play function in siocons).

-Dave