Can't access a music CD

[Polytropon]

On Thu, 13 Oct 2011 22:03:29 +0000, Alexander Best wrote:
> On Thu Oct 13 11, Polytropon wrote:
> > On Thu, 13 Oct 2011 16:25:24 +0000, Alexander Best wrote:
> > > ano ther thought might be to implement an audio cd filesystem, so one could do
> > > 'mount -o audiocdfs /dev/cd0 /media/cd' and then all tracks appear as RAW pcm
> > > audio files. maybe fuse comes with something like this?
> > 
> > What about /dev/acd0t[01,02,03,...] - aren't those supposed
> > to represent the individual audio tracks that could then be
> > interpreted as what they basically are, raw pcm (of cd-audio
> > specification)?
> 
> i inserted an audio cd and they didn't turn up. i guess ATA_CAM doesn't support
> individual nodes for tracks.

When using the (now default) CAM methods (ATAPICAM), I think
this is true.

Example with a regular music CD:

% cdcontrol info
Starting track = 1, ending track = 19, TOC size = 162 bytes
track     start  duration   block  length   type
-------------------------------------------------
    1   0:02.00   2:05.01       0    9376  audio
    2   2:07.01   1:45.53    9376    7928  audio
    3   3:52.54   2:37.49   17304   11824  audio
    4   6:30.28   1:52.00   29128    8400  audio
    5   8:22.28   2:08.29   37528    9629  audio
    6  10:30.57   2:23.01   47157   10726  audio
    7  12:53.58   4:01.01   57883   18076  audio
    8  16:54.59   3:12.37   75959   14437  audio
    9  20:07.21   2:09.00   90396    9675  audio
   10  22:16.21   4:19.67  100071   19492  audio
   11  26:36.13   3:28.00  119563   15600  audio
   12  30:04.13   3:48.73  135163   17173  audio
   13  33:53.11   3:51.38  152336   17363  audio
   14  37:44.49   1:27.72  169699    6597  audio
   15  39:12.46   2:15.15  176296   10140  audio
   16  41:27.61   2:35.01  186436   11626  audio
   17  44:02.62   2:11.00  198062    9825  audio
   18  46:13.62   2:37.01  207887   11776  audio
   19  48:50.63   2:48.01  219663   12601  audio
  170  51:38.64         -  232264       -      -

% ls /dev/acd0*
/dev/acd0     /dev/acd0t04  /dev/acd0t08  /dev/acd0t12  /dev/acd0t16
/dev/acd0t01  /dev/acd0t05  /dev/acd0t09  /dev/acd0t13  /dev/acd0t17
/dev/acd0t02  /dev/acd0t06  /dev/acd0t10  /dev/acd0t14  /dev/acd0t18
/dev/acd0t03  /dev/acd0t07  /dev/acd0t11  /dev/acd0t15  /dev/acd0t19

% ls /dev/cd0*
/dev/cd0

Maybe obtaining a TOC listing of the CD is required to make the
track files appear? However, they are only present for the ATAPI
based access (acd0), not for the "SCSI" CAM based one (cd0).




-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...