Date: Tue, 19 Sep 2000 03:51:39 +0400 From: "Valeriy E. Ushakov" <uwe@ptc.spbu.ru> To: Soren Schmidt <sos@freebsd.dk> Cc: freebsd-multimedia@freebsd.org Subject: Re: I'll be rolling a 4.1.1 release on September 25th Message-ID: <20000919035139.A2240@snark.ptc.spbu.ru> In-Reply-To: <200009172038.WAA86368@freebsd.dk>; from "Soren Schmidt" on Sun, Sep 17, 2000 at 22:38:39 References: <20000916174845.B28031@snark.ptc.spbu.ru> <200009172038.WAA86368@freebsd.dk>
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On Sun, Sep 17, 2000 at 22:38:39 +0200, Soren Schmidt wrote:
> Because I dont favour the ioctl interface, its no longer needed...
>
> > If /dev/acd*t* is going to be the answer then can this be stated
> > directly, please, to cut the confusion. BTW, as I wrote just few days
> > ago, acd*t* support was MFC'ed but relevant changes to MAKEDEV to
> > create those devices were not.
>
> No its not, you simply open /dev/acdNc and set the blocksize to
> what you need with the CDRIOCSETBLKSIZE ioctl and reads the blocks
> woth a normal read from the device....
Ah, this is starting to make sense. However it didn't work as
expected so I monkeyed around and I think that the problem is that
ccb[9] = 0x10;
assignment in acd_start. From luoqi's patch and also from old patches
to 2.2.8 wcd driver (revealed by google)
ftp://ftp.nsysu.edu.tw/FreeBSD/taiwan/CSIE/vcd/vcd_2.2.8.patch
I believe this should be 0xf8. It's not that these numbers make *any*
sense to me :-), however after changing the line to be:
ccd[9] = 0xf8;
I can successfully use you advice to CDRIOCSETBLKSIZE 2352 than lseek
and read structures:
struct vcdsector {
u_char sync[12];
u_char header[4];
u_char subheader[8];
u_char data[2324];
u_char spare[4];
};
writing out the data[2324] part.
Wow, thanks!
PS: I would never thought about using CDR(!) ioctl.
SY, Uwe
--
uwe@ptc.spbu.ru | Zu Grunde kommen
http://www.ptc.spbu.ru/~uwe/ | Ist zu Grunde gehen
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