RE: Help reading mixed audio and data CD

Hi Kris,

There is a gap between the last audio track and the data track on data
CDs. It has been a while since I wrote the code, but from looking at it,
it seems the gap is 152 seconds long. Hence, you need to subtract 152
seconds from the length of the track before the data track.

Mike

-----Original Message-----
From: Kris Warkentin [mailto:[email protected]] 
Sent: Wednesday, December 21, 2005 2:36 PM
To: '[email protected]'
Cc: '[email protected]'
Subject: Help reading mixed audio and data CD

Hi Grip developers,

My name is Kris Warkentin from QNX Software Systems in Canada.  Part of
my
job is actually as a gdb maintainer and we also are the maintainers of
the C
development toolkit in the Eclipse IDE.  As a company, we're trying to
give
back so I hope you won't mind if I ask you to help enlighten me on a
problem
I'm having.

Given an audio cd with a data track (1-12 audio, 13 data), our driver is
reading the TOC and giving back the addresses (lba) of each track.  So
the
method of calculating the length is simply track[n].length =
track[n+1].lba
- track[n].lba.  This in general seems fine but in the case of this
particular audio cd, the lba of track 13 comes out as quite a bit too
high
resulting in the calculation of the song length being over 6 minutes
instead
of 3:45.

Windows calculates this correctly as does your software.  Interestingly,
the
Gnome CD player doesn't seem to do it right but you guys have definitely
got
it.

Anyway, sorry to be asking vague and stupid questions but our driver
developer insists that he just reads the TOC off of the disk with no
modifications and that there are no further inferences to be made about
the
lengths of the tracks.  Even if it isn't something that can be corrected
in
the driver, I'd love to be able to correctly figure out the length of
the
last track.

cheers,

Kris


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