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

[Rocky Bernstein]

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
> TOC/PMA/ATIP
> > 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
>
> http://www.theunixzoo.co.uk
>
>