[vdr] Re: DVD-Plugin / libdvdcss

["Tilo Renkl" <tilo@diredare.de>]

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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