[Cdrdao-devel] CD+G and raw mode

[Bill M. <mo...@ha...>]

The disclaimer is I know next to nothing about CD+G other than my kids
are trashing their CD+Gs and I want to make a backup.  And I know also
little about the inner secrets of CDs in general.  Then there's my
shell scripting skills....

With that clear, I'm able to make a backup CDR of a CD+G using the
following.  Is this the recommended way?

    #!/bin/sh

    if [ -z "$1" ]; then
        echo "Usage: $0 <discname>"
        exit 0
    fi


    cdrdao read-cd \
        --read-raw \
        --read-subchan rw_raw \
        --device /dev/cdr \
        --datafile "$1.bin" \
        "$1.toc" || exit 0

    echo "Burn use: cdrdao write $1.toc"


Here's my question:  I tried just using

    cdrdao read-cd --read-subchan rw foo.toc

but the resulting CD+G I burned was not playable -- it kind of worked
but the graphics didn't always work and the audio buzzed.

I'm trying to understand why I need to do the --read-raw and
--read-subchan rw_raw.

If I understand correctly, --read-raw says to bypass the error
correction done by the drive -- so any errors in the read are then
transferred to the cdr on the write operation.  Is that correct?  I
would think I would want the error correction.

Or is it not the --read-raw that is making the difference, but the
--read-subchan rw_raw that is required for some reason with CD+G.

Thanks,



-- 
Bill Moseley
mo...@ha...