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[AVT] Re: ABNF in draft-ietf-avt-smpte-rtp-08.txt

Dave Singer <singer@apple.com> Wed, 21 February 2007 18:08 UTC

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Date: Wed, 21 Feb 2007 10:07:03 -0800
To: Tom-PT Taylor <taylor@nortel.com>, avt@ietf.org
From: Dave Singer <singer@apple.com>
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Subject: [AVT] Re: ABNF in draft-ietf-avt-smpte-rtp-08.txt
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At 11:21  -0500 21/02/07, Tom-PT Taylor wrote:
>The ABNF in section 4 of draft-ietf-avt-smpte-rtp-08.txt needs 
>fixing. Per RFC 4234, alternatives are expressed by forward slash 
>rather than vertical bar. Thus your first line should be:
>
>digit = "0"/"1"/"2"/"3"/"4"/"5"/"6"/"7"/"8"/"9"

I'm sure I copied this string from another RFC, but I don't mind changing it...

>I also note a discrepancy (legal, but undesirable) between the 
>complete extensionattributes string and its definition as a series 
>of space-separated parameters in [hdrext].

No, hdrext merely says that it is separated from the URI by a space. 
Or did I write something I didn't intend?

>Would you consider replacing the "/" separator by space as defined 
>in [hdrext]? Or is [hdrext] wrong in specifying space as a separator?

as I say, unless I missed something, I don't think it necessary.

>
>Finally, to get what you want for drop, use the square brackets:
>
>drop = "/drop"
>or
>drop = space "drop"
>
>and
>
>extensionattributes = frame_duration "/" frames_per_tc_second [drop]
>or
>extensionattributes = frame_duration space frames_per_tc_second [drop]

ok

-- 
David Singer
Apple Computer/QuickTime

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