[paranoia] powerbook titanium cd...

[Hyung-song Nam]

Starting with MacOS 9, Macs play audio CD's via CDDA.. Machines 
shipped recently have no audio cables on CD/DVD-ROM drives...

>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).
>
>From section 4.2.6, ''Sensing support for CD-audio commands'':
>
>	The preferred method of sensing support for CD audio is the
>	implementation of the GET CONFIGURATION command, see sub-clause
>	6.1.4. For legacy implementations, if any commands related to
>	audio operations are implemented, then the PLAY AUDIO(10) command
>	shall be implemented to allow a method for the Initiator to
>	determine if audio operations are supported.  A target responding
>	to a PLAY AUDIO(10) command that has a transfer length of zero,
>	with CHECK CONDITION STATUS, and setting the sense key to ILLEGAL
>	REQUEST does not support audio play operations.
>
>So it looks like your drive just doesn't support audio.
>
>--
>         Peter
>
>Your concience never stops you from doing anything; it merely stops
>you from enjoying it.
>
>
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-- 

   Hyung-song Nam / nam at wi.mit.edu
   Whitehead Institute for Biomedical Research
   9 Cambridge Center, Cambridge, MA 02142

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