From owner-freebsd-multimedia  Sun Feb 15 21:53:36 1998
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From: Luigi Rizzo <luigi@labinfo.iet.unipi.it>
Message-Id: <199802160425.FAA27220@labinfo.iet.unipi.it>
Subject: Re: VideoCD (VCD) on freeBSD
To: tristan@mpegtv.com (Tristan Savatier)
Date: Mon, 16 Feb 1998 05:25:57 +0100 (MET)
Cc: doconnor@gsoft.com.au, jwlo@ms11.hinet.net, multimedia@FreeBSD.ORG
In-Reply-To: <34E7C57C.59E0E253@mpegtv.com> from "Tristan Savatier" at Feb 15, 98 08:49:45 pm
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> Daniel O'Connor wrote:
> > 
> > > > > 2) the following ioctl should be implemented for reading mode2 form2
> > > > > sectors of CDROM-XA:
> > > > > CDROMREADTOCHDR
> > Can be done
> > 
> > > > > CDROMREADTOCENTRY
> > Ditto..
> > 
> > > > > CDROMREADRAW
> > Not yet :(
> > (I'm pretty sure of this, but I could be wrong)

for SCSI i think there is already such a call (perhaps with a
different name).

i have some diffs for the latter on ATAPI drives (with much help
from other people) at

    http://www.iet.unipi.it/~luigi/cdda980108.diffs

(it actually implements a generic ATAPI command, but can do the purpose)
the problem with this code is that some drives seem to behave in a way
which contraddicts the ATAPI specs (at least the ones I have) so that
at times they miss one interrupt. since our atapi code does not have a
watchdog, this means hanging the IDE bus where the drive is attached.

it's not this code which is faulty, but it might trigger bugs elsewhere.

> And in order for mtv to work with Linux emulation, those ioctl must
> be the same numbers and work exactly the same way as on Linux.

this is usually fixed through small adaptation routines in linux_ioctl.c
(which basically translates all ioctl names and juggles with parameters
in and out)

	cheers
	luigi

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