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Re: [Libcdio-devel] CD_MSF_FORMAT vs LBA on NetBSD

From: Rocky Bernstein
Subject: Re: [Libcdio-devel] CD_MSF_FORMAT vs LBA on NetBSD
Date: Tue, 30 Oct 2018 22:58:30 +0100

On Tue, Oct 30, 2018 at 10:33 PM Edd Barrett <address@hidden> wrote:

> On Tue, Oct 30, 2018 at 09:16:31PM +0100, Thomas Schmitt wrote:
> > A simple solution would be to throw out get_track_lba_netbsd() and
> > to set .get_track_lba to NULL.
> > Then both functions in track.c would use get_track_msf_netbsd().
> > Next one would fix get_track_msf_netbsd() to take into respect
> >   p_env->gen.i_first_track
> > instead of 1 when accessing .tocent[] by track number.
> >
> > As long as it is purely about CD media, asking the drive for LBA offers
> > no advantage over asking it for MSF (that's SCSI command READ
> > field "Format"). On DVD and BD media there are LBAs which exceed the
> limit
> > of 256 minutes. But there are no audio sectors on DVD or BD.
> Interesting. There's a lot to take in here.
> Is it important, though, to offer up both addressing modes for consumers
> of libcdio?

No. There are routines an application programmer can use to convert between
MSF and LBA.

Or is it not exposed that way?

> Put differently, if the underlying OS supports both addressing modes,
> should we implement both callbacks in the driver.
> (I may have some time to try some of your suggestions at the weekend)
> Greg, any thoughts?
> --
> Best Regards
> Edd Barrett

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