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From: David Kaye on 28 Jun 2010 21:40
It was actually fairly simple.

Open the file in binary, swallow it into a variable, do INSTRs on a selection
of tags, count out 20 paces from the start of the tag to to the beginning of
the ASCII tag info, stop counting the string at the first null.

The tags have weird names like �ART and �wrt and various other oddball stuff.

Seems to work for about 95% of the M4A files I've tried it on.

From: Dee Earley on 30 Jun 2010 09:57
On 29/06/2010 02:40, David Kaye wrote:
> It was actually fairly simple.
>
> Open the file in binary, swallow it into a variable, do INSTRs on a selection
> of tags, count out 20 paces from the start of the tag to to the beginning of
> the ASCII tag info, stop counting the string at the first null.
>
> The tags have weird names like �ART and �wrt and various other oddball stuff.
>
> Seems to work for about 95% of the M4A files I've tried it on.

Note that if you're using string, it will most likely not work on non
english systems.
Treating binary data as a string is not safe, especially when the
conversion (in VB) goes via a multibyte to unicode transformation.

--
Dee Earley (dee.earley(a)icode.co.uk)
i-Catcher Development Team

iCode Systems

(Replies direct to my email address will be ignored.
Please reply to the group.)
From: David Kaye on 30 Jun 2010 10:24
Dee Earley <dee.earley(a)icode.co.uk> wrote:

>Note that if you're using string, it will most likely not work on non
>english systems.
>Treating binary data as a string is not safe, especially when the
>conversion (in VB) goes via a multibyte to unicode transformation.

Good point. I'll look into that later when I'm satisfied that I can
consistently get the tags.

I'm still having problems with the genre category, sometimes "gnre" and
sometimes "gen", which is sometimes a string and sometimes two nulls and a
byte, with no apparent consistency. The byte doesn't appear to relate to any
lookup table I've seen. In my application, the genre isn't really important
since I already have a lookup table in order to make the genre classification
consistent.

But with a consistency approaching 98% I'm not too worried about the stuff
that doesn't work for now...

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