[paranoia] powerbook titanium cd...

[Peter Jones]

On 18 Apr 2001, David N. Welton wrote:

> @ashland [~] $ cat /proc/sys/dev/cdrom/info
> CD-ROM information, Id: cdrom.c 3.12 2000/10/18
...
> Can play audio:         0
...
> *However*, macosX seems to be able to do it.  Any ideas how?!

Quite probably by reading as data and playing through the sound card.

> hdc: Enabling MultiWord DMA 2
> Bogus interrupt -1 from PC = c00064d4
> hdc: ATAPI 24X DVD-ROM drive, 512kB Cache, (U)DMA
> Uniform CD-ROM driver Revision: 3.12
> VFS: Disk change detected on device ide1(22,0)
> hdc: packet command error: status=0x51 { DriveReady SeekComplete Error }
> hdc: packet command error: error=0x54
> ATAPI device hdc:
>   Error: Illegal request -- (Sense key=0x05)
>   Invalid command operation code -- (asc=0x20, ascq=0x00)
>   The failed "Play Audio MSF" packet command was:
>   "47 00 00 00 00 00 00 00 00 00 00 00 "

"Play Audio MSF" is the command to play audio at a particular
minute/second/frame location on the CD.  This says that the command was
sent to the drive, and that the drive does not support that operation.

This particular command is a probe for the capability -- both start and
end times are set to 0/0/0.  Here's the exact quote from the MMC3
specification (this from a draft, unfortunately).