Date: Tue, 10 Oct 2000 02:06:51 +0400 From: "Valeriy E. Ushakov" <uwe@ptc.spbu.ru> To: Heiko Schaefer <320048919767-0001@t-online.de> Cc: freebsd-multimedia@FreeBSD.ORG Subject: Re: vcd Message-ID: <20001010020651.B4051@snark.ptc.spbu.ru> In-Reply-To: <Pine.BSF.4.21.0010092303470.34461-100000@daneel.foundation.hs>; from "Heiko Schaefer" on Mon, Oct 09, 2000 at 23:40:08 References: <14790.25254.881225.246152@guru.mired.org> <Pine.BSF.4.21.0010092303470.34461-100000@daneel.foundation.hs>
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On Mon, Oct 09, 2000 at 23:40:08 +0200, Heiko Schaefer wrote:
> now i gathered that sys/cdio.h is where the action is.
Funny thing is that the required ioctl is in <sys/cdrio.h> (note the R).
> what i am really confused about is: is there any way to read raw
> data off a video cd that works on both ide and scsi ?
As I already reported, I changed atapi-cd.c (acd_start) on my system
from:
ccb[0] = ATAPI_READ_CD;
! ccb[9] = 0x10;
to
ccb[0] = ATAPI_READ_CD;
! ccb[9] = 0xf8;
Accoring to Table 99, "Number of Bytes Returned Based on Data
Selection Field" on page 147 of ATAPI draft (8020rev26.pdf) - flags
0xf8 will make READ-CD command to return raw 2352 bytes for *all*
track modes.
0x10 means user data only
0xf8 means everything in the sector (sync & all headers & user data &
edc/ecc).
Well, may be 0x10 a logical choice
. it didn't worked for me ;-)
. it doesn't allow raw reads, would people need them (perhaps code
should check for blocksize == 2352 and use 0xf8 assuming 2352
implies a raw read?)
With that one line patch to the driver I wrote a simple program that
uses CDRIOCSETBLOCKSIZE, just as Soren described, and I can grab/view
VCDs happily.
SY, Uwe
--
uwe@ptc.spbu.ru | Zu Grunde kommen
http://www.ptc.spbu.ru/~uwe/ | Ist zu Grunde gehen
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