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[vdr] Re: DVD-Plugin / libdvdcss
Hi Michael,
You are right. It is a USB-DVD drive.
I will try your patch ASAP.
Thanx.
Tilo
> -----Original Message-----
> From: vdr-bounce@linuxtv.org
> [mailto:vdr-bounce@linuxtv.org]On Behalf Of
> Michael Hunold
> Sent: Thursday, October 16, 2003 11:48 AM
> To: vdr@linuxtv.org
> Cc: tilo@diredare.de
> Subject: [vdr] Re: DVD-Plugin / libdvdcss
>
>
> Hello Tilo,
>
> > I have problems playing CSS-DVD's in my USB-DVD drive. There is an
> > errormessage
> > that something with ioctl is not working. Playing non
> scrabled DVD's works
> > fine.
> >
> > Does anybody have the same problem, and maybe a solution for it ?
>
> Let me guess: is this a SCSI-2/USB drive?
> (Have a look at "dmesg" output to find it out)
>
> If so, the problem is inside SCSI drive recognition system,
> which can be
> found in "drivers/scsi/sr.c".
>
> The function "get_capabilities()" tries to find out which
> type of drive
> you have.
>
> ---------------------------schnipp----------------------------
> ----------
> rc = sr_do_ioctl(i, cmd, buffer, 128, 1, SCSI_DATA_READ, NULL);
>
> if (rc) {
> /* failed, drive doesn't have capabilities mode page */
> scsi_CDs[i].cdi.speed = 1;
> scsi_CDs[i].cdi.mask |= (CDC_CD_R | CDC_CD_RW |
> CDC_DVD_R |
> CDC_DVD | CDC_DVD_RAM |
> CDC_SELECT_DISC |
> CDC_SELECT_SPEED);
> scsi_free(buffer, 512);
> printk("sr%i: scsi-1 drive\n", i);
> return;
> }
> ---------------------------schnipp----------------------------
> ----------
>
> For my SCSI-2/USB drive, the above SCSI_DATA_READ command
> fails. As you
> can see, in this case the driver thinks that your drive is
> SCSI-1, ie. a
> CD-drive only.
>
> Unfortunately, the driver only knows SCSI-1 and SCSI-3, so
> you're out of
> luck.
>
> The patch below unmasks the DVD drive bit, ie. even if the kernel
> misdetects your driver, it will allow DVD ioctls to be passed
> to your drive.
>
> This is not a safe fix, but "it works for me"(tm).
>
> > Thanx in advance.
> > Tilo
>
> CU
> Michael.
>
>
>
>
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