Re: [Libcdio-devel] Re: Retrieving DATA session from multisession audio disc

[Rocky Bernstein]

On Tue, Nov 16, 2010 at 8:27 PM, Eric Shattow "Eprecocious" <
address@hidden> wrote:

> Backing the topic up a bit, how about doing the extracting using
> libcdio?  extricate.c makes use of linux/cdrom.h which is not
> portable. A libcdio-based tool would be preferable.
>

Patches are most welcome.


>
> On Thu, Apr 15, 2010 at 12:12 PM, Thomas Schmitt <address@hidden>
> wrote:
> > Hi,
> >
> >> Using isoinfo (NOT iso-info) it seems stuff is in place:
> >> [morituri-uninstalled] address@hidden trunk]$ isoinfo -N 207106 -i
> >> Ladyhawke\ -\ Ladyhawke/data.iso  -l
> >
> > So the offset 207106 seems to be the right one.
> > (I found this helptext of isoinfo:
> >  http://www.herongyang.com/CD-DVD/Data-CD-ISO-9660-isoinfo.html
> >  "-N sector   Sector number where ISO image should start on CD"
> > )
> >
> >
> >> a) can I write this (wrong) iso as is to a mixed mode cd to make a
> >> perfect copy of my cd ?
> >
> > You will have to put it exactly to offset 207106
> > so that it works unaltered.
> > Possibly one can do that with cdrecord -sao or
> > some -raw* option if one has suitable input files
> > for the tracks which come before the ISO track.
> >
> > But that's outside of my own experience.
> >
> >
> >> I couldn't get this to mount either:
> >> address@hidden thomas]# mount -t iso9660 -o loop,sbsector=207106 dummy.iso
> /mnt/iso/
> >
> > Did you append the image to the end of a file of
> > exactly the right size ?
> > In this case:
> >
> >   dd if=/dev/zero \
> >   bs=2K count=1 seek=207105 \
> >   of=cd_dummy.iso
> >
> > Note that you have to seek to (207106 - 1)
> > and then write 1 block, to get 207106 blocks.
> >
> > Does this cd_dummy.iso show with ls -l a size of
> > 424153088 bytes ? (Before you append data.iso)
> >
> >
> > I just tried this with a multi-session CD on
> > Debian 5.04. Track start block is 109287,
> > track size is 3497:
> >
> >  $ dd if=/dev/hda bs=2048 skip=109287 count=3497 of=track1.iso
> >  $ dd if=/dev/zero bs=2K count=1 seek=109286 of=cd_dummy.iso
> >  $ cat track1.iso >> cd_dummy.iso
> >  $ su
> >  # mount -t iso9660 -o loop,sbsector=109287 cd_dummy.iso /mnt
> >  # ls /mnt
> >
> > shows lots of files.
> >
> >
> > ------------------------------------------------
> >
> >> > Adventurous testers could try losetup option -o
> >> > with a negative value or mount option "offset".
> >> What value would this be there ? I tried in a loop with lots of values,
> >> none worked.
> >
> > I would have thought that this might work
> >
> >  # losetup -f
> >  /dev/loop0
> >  # losetup -o -207106 /dev/loop0 data.iso
> >  # mount -t iso9660 -o sbsector=207106 /dev/loop0 /mnt
> >
> > but on Debian 5.04 (with 109287) it doesn't.
> >
> >
> >
> >
> >
> >
>
>