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Re: [Cellar] VINT_DATA of all ontes

Steve Lhomme <slhomme@matroska.org> Sun, 17 June 2018 15:05 UTC

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From: Steve Lhomme <slhomme@matroska.org>
Date: Sun, 17 Jun 2018 17:05:40 +0200
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To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Dave Rice <dave@dericed.com>, Codec Encoding for LossLess Archiving and Realtime transmission <cellar@ietf.org>
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Subject: Re: [Cellar] VINT_DATA of all ontes
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2018-06-07 18:57 GMT+02:00 Michael Richardson <mcr+ietf@sandelman.ca>:
>
> Dave Rice <dave@dericed.com> wrote:
>     >> Additionally,
>     >> an "Element ID" with binary encoding of "1111 1111" is invalid since
>     >> the "VINT_DATA" section is set to all one values, whereas an "Element
>     >> ID" with binary encoding of "0100 0000 0111 1111" stores a
>     >> semantically equal "VINT_DATA" and is the shortest possible
>     >> "VINT" encoding.
>     >>
>     >> It seems that there is a prohibition on VINT_DATA that is all ones.
>     >> I can't find a place in section 6 that says this.
>
>     > Just before your quote, I see:
>
>     > "The VINT_DATA component of the Element ID MUST NOT be either defined
>     > or written as either all zero values or all one values.”
>
> Ah, my eyes missed that.
>
> Could we split this into three paragraphs, and can we add some explanation of
> why all zeros and all ones is forbidden?

In general do why want to explain why this or that technical choice
was made ? It doesn't seem to be the case in the RFCs I know and might
add considerable work.

If it's just for this particular case it can be done.

>     >> Is this a restriction on
>     >> all VINT_DATA, or just ones used for Element ID?
>
> Would the WG like to simply skip allocation of Element IDs values which
> would be all ones in the appropriate encoding?  Clearly, one can go to the
> next bigger VINT size and express it, but it seems like skipping that value
> is simpler.  I believe that my suggested IANA Considerations text on
> this value does that.

Should the IANA part restate the rules on how the IDs should be
understood and what is/isn't allowed ? Or maybe we can just put a
reference to the section about EBML IDs ?

> --
> ]               Never tell me the odds!                 | ipv6 mesh networks [
> ]   Michael Richardson, Sandelman Software Works        | network architect  [
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [
>
>
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-- 
Steve Lhomme
Matroska association Chairman

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