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Re: [MMUSIC] Feedback requested on requirements

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 24 April 2013 05:36 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Dale R. Worley" <worley@ariadne.com>, Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [MMUSIC] Feedback requested on requirements
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Date: Wed, 24 Apr 2013 05:36:19 +0000
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Feedback requested on requirements
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What do you mean by "known attribute" and a "known codec"? 

Any defined attribute/codec is "known".

Regards,

Christer

-----Original Message-----
From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf Of Dale R. Worley
Sent: 23. huhtikuuta 2013 21:58
To: Martin Thomson
Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] Feedback requested on requirements

> From: Martin Thomson <martin.thomson@gmail.com>
> 
> C3 and C4 look good.
> 
> On 23 April 2013 08:30, Dale R. Worley <worley@ariadne.com> wrote:
> >    non-DES C5  SBCs generally pass through attributes that they do not
> >       understand.  SBCs generally pass through codec specifications that
> >       they do not understand, even if they are configured to transcode
> >       certain specific codecs.
> 
> I'm not sure how to parse this.  Is that a double-negative or just two 
> negatives for emphasis?
> 
> Do you intend to say that the solution should NOT rely on new 
> attributes because SBCs will suppress them, or that the solution is 
> permitted to use new attributes because SBCs are expected to pass 
> attributes.

I mean the latter.  The intended parsing is:

    (non-DES) C5  SBCs generally pass through attributes that they do not...

That is, the possible requirements "Use only known attributes." and "Use only known codecs." are not requirements.

> Non-requirements and non-constraints are always difficult to get right.

There needs to be a word for this...

Dale
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