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From: Terry Lambert <terry@lambert.org>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: digital audio extraction from CD-ROM via SCSI
Date: Mon, 11 Nov 1996 12:47:22 -0700
Organization: Me
Lines: 52
Message-ID: <328782CA.4F5E859@lambert.org>
References: <55lonc$hi@hannibal.camelot.de> <55slgr$h3@anorak.kew.utl> <SCOTT.96Nov8141107@crux.dcs.qmw.ac.uk> <560qrf$1g3@itchy.serv.net>
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Sean T. Lamont . wrote:
] In article <SCOTT.96Nov8141107@crux.dcs.qmw.ac.uk>,
] Scott Mitchell <scott@dcs.qmw.ac.uk> wrote:
]
] >Or, you could (presumably) just suck blocks of audio data off of
] >the disk and get your sound as raw bits.
[ ... ]
] the audio data is at a lower level than the cd-data. You need
] a non-standard CD rom to do this , most won't allow it. The only
] one I know for sure that will do it is the one they ship with
] the HPPA systems ; this isn't manufactured by HP, so it has a
] real part number for a non-HP mfr, but I don't know what it is.
The audio data was protected from access by CDROMs during
the early days for the same reason that DAT tapes are useless
for audio data: to "protect" the recording industry.
The first CDROM capable of reading audio CDROM contents as
digital data was the Hitachi CDROM sold by SGI.
The first commercially available CDROM capable of reading audio
data off the CDROM as digital data was the Toshiba 3401B; I
happen to have bought one because of that, and because I was
interested in reading the data off and writing it to the
Sony MiniDisc drives which are still available as audio
devices, and which I had access to one of the computer versions
early on... disappointing capacity, really -- they use compression
instead of dense storage, and are utterly useless for CDI video.
I wanted to put one together with a handicam display and
transfer Uresai Yatsura episodes to MiniDisc: Sony screwed up. I
feel robbed. 8-(.
Today, most good CDROMs can read audio data as digital information.
If yours can't, it's not "good"...
In general, if you have a SCSI II CDROM, you should be set.
You should contact the FreeBSD multimedia mailing list (or
Amancio Hasty, the FreeBSD multimedia guru) for driver information
(I believe Amancio even had CDI working last time I checked).
Regards,
Terry Lambert
terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.