Re: [MacPerl] Querying audio CD for track pre-play times

[Ken Williams <ken@forum.swarthmore.edu>]

ajf@afco.demon.co.uk (Alan Fry) wrote:
>At 8:26 pm -0500 18/04/00, Ken Williams wrote:
>What exactly do you mean by "pre-track pause"? To the best of my 
>knowledge the only information on the disc about the contents of the 
>disc is the absolute start time (in minutes, seconds and frames) of 
>each track. This is returned by Mac.pm in 'cd_toc' ( and in 
>alternative format by 'cddb_toc').

I'm not sure how it's implemented on the disc, but that information is
definitely there.  You can observe it on most commercially-produced CDs
by noting that before many tracks the timer will count down -00:02,
-00:01, 00:00, 00:01, ....

In Toast, you can manually set the pause before each track.  This adds
the countdown time before each track starts playing.

[does a little research...]

According to the Toast manual (v.4 p.4-22), the silences are simply
empty sectors on the disk before each track, and run-out sectors after
each track.  The standard pause of 2 seconds seems to be 150 empty
sectors and 2 run-out sectors.  This is my first reading of the
information, so I might still have a misunderstanding of it.

So perhaps what I'm looking for is a way to figure out how many empty sectors
precede each track?

>The CPAN distribution of Mac.pm certainly does include the compiled 
>binary for Mac.xs and it works fine. There has been quite a lot of 
>discussion in these pages in recent times about installing modules on 
>the Mac and to say the least I am not the best person to add anything 
>to that.

After Chris told me that the distribution is supposed to include the
binary fies, I tried dropping it on my Stuffit Expander and found that
the files appeared.  Copying them manually to my site_perl folder fixed
the installation.  But installme.plx didn't work, it didn't extract the
binary files.




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