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Re: [Libcdio-devel] CD-TEXT documentation


From: Rocky Bernstein
Subject: Re: [Libcdio-devel] CD-TEXT documentation
Date: Sun, 5 Feb 2012 14:00:15 -0500

On Sun, Feb 5, 2012 at 12:23 PM, Thomas Schmitt <address@hidden> wrote:

> Hi,
>
> > http://jbum.com/cdg_revealed.html
>
> Very interesting. (Very very pre-MMC, too.)
>
> The graphics protocol reminds me of my first self-implemented pixel
> graphics
> on a VIC-20.
> It has nothing to do with CD-TEXT, except that it has to fit into the
> same kind of 24 x 6 bit packets. It would be suitable to fill a few MB.
> So its use in the program area makes sense.
>
> Consider to fork a node "CD+G" from "CD Text". Both are only related
> by the fact that they use the subchannels R to W for storing data.
>

Also, they are both extensions to the Red Book that I don't have much to
say about  other than to draw attention to the fact that there are  these
extensions. That is why they are lumped together.




>
>
> --------------------------------------------------------------------
> Looking at the commit diff of cd-text.texi:
>
> Here you altered the technical statement:
>
>   Pack type @kbd{0x87} (Genre Identification) contains 2 binary bytes,
>  -followed by 0-terminated text.  The two bytes constitute a 16-bit
>  -Big-endian number are decoded as follows:
>  +followed by an ASCII NUL.  For category associated with Big-endian 16-bit
>  +value is given see @ref{table:categories}.


> The NUL comes after the text which describes a sub-genre. You removed the
> mentioning of this text.
> (The sentence "For category ..." looks somehwat ill, too.)
>

Ok. Changed.

>
> -----
>
>  -Pack type @kbd{0x89} is yet quite unclear. It might be a representation
>  +Pack type @kbd{0x89} (Second Table of Contents) not yet clear.
>
> The verb "is" seems to be missing.
>

Ok. Changed.


>
> -----
>
>  -Pack type @kbd{0x89} is yet quite unclear. Especially what the
>  +It is not unclear what Pack type @kbd{0x89} is used for, and what the
>
> "not" is surplus and deceiving.
>

"not" removed. "not's can tie one in knots".


>
> -----
>
>
> Have a nice day :)
>
> Thomas
>
>
>


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