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Re: [payload] I-D Action: draft-ietf-payload-rtp-ancillary-13.txt

Thomas Edwards <Thomas.Edwards@fox.com> Thu, 04 January 2018 01:17 UTC

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From: Thomas Edwards <Thomas.Edwards@fox.com>
To: John Fletcher <John.Fletcher@bbc.co.uk>, "payload@ietf.org" <payload@ietf.org>
Thread-Topic: [payload] I-D Action: draft-ietf-payload-rtp-ancillary-13.txt
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Date: Thu, 4 Jan 2018 01:17:41 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/payload/yT0QVGdOHgZ_yjPaId_K6cQuFwc>
Subject: Re: [payload] I-D Action: draft-ietf-payload-rtp-ancillary-13.txt
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draft-ietf-payload-rtp-ancillary-13 currently says for Horizontal_Offset:

“This field defines the location of the ANC data packet in an SDI raster relative to the start of active video (SAV, a digital synchronizing signal present in SDI interfaces) as an unsigned integer in network byte order.  A value of 0 means that the Ancillary Data Flag (ADF) of the ANC data packet begins immediately following SAV.  For HD, this is in units of Y samples as defined in ITU-R BT.1120 [BT1120]…”

How about we change the last sentence to:

“For HD, the horizontal offset from SAV is measured in terms of 10-bit words of the particular channel indicated by the ‘C’ bit.”

-Thomas


On 12/20/17, 9:30 AM, "payload on behalf of John Fletcher" <payload-bounces@ietf.org on behalf of John.Fletcher@bbc.co.uk> wrote:

    I think there may still be an issue with the definition of Horizontal_Offset.  No definition is given for UHD and I'm not sure that the HD definition in terms of Y samples is always applicable.
    
    The ANC data consists of 10-bit words in a 10-bit data stream (or a data channel of a data stream).  The position should be measured in terms of  10-bit words relative to the SAV sequence in the data stream.  A definition along those lines works regardless of the image format (YCbCr, RGB, 10-bit, 12-bit) or the mapping from source image to interface.
    
    John Fletcher
    ________________________________________
    From: payload [payload-bounces@ietf.org] on behalf of Ali C. Begen [ali.begen@networked.media]
    Sent: 16 December 2017 14:21
    To: payload@ietf.org
    Subject: Re: [payload] I-D Action: draft-ietf-payload-rtp-ancillary-13.txt
    
    Payload WG,
    
    Is there any objection to the latest revision that addresses the issues Thomas pointed out earlier? The draft was in the RFC editor queue and if there are no objections, we will soon ship it back there. But to give people a chance to read and officially comment on the revision, I think we should start a new IETF LC for a week.
    
    @Ben, could we do that?
    
    -acbegen

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