Re: [clue] MaxCaptures updated text

Hello Mark,

Thanks for the comments. Please see below.

Regards, Christian

On 7/03/2014 3:21 AM, Duckworth, Mark wrote:
> Hi Christian,
> This makes sense to me.
>
> If anybody still wants to propose text for adding the "switched" attribute, please do so.  But I think we don't need it.
>
> More Comments inline.
> Mark
>
>> -----Original Message-----
>> From: clue [mailto:clue-bounces@ietf.org] On Behalf Of Christian Groves
>> Sent: Wednesday, March 05, 2014 7:42 PM
>> To: clue@ietf.org
>> Subject: [clue] MaxCaptures updated text
>>
>> Hello all,
>>
>> Here's some proposed text to address today's action point on MaxCaptures
>> with respect to "=" and "<=". Its also partly also addressing the discussion we
>> had on "switched" and "composed" by listing the interaction between the
>> MaxCaptures value and the number of captures in the MCC. Hopefully that
>> gives a framework for further discussions.
>>
>>
>> 7.2.1.1. Maximum Number of Captures within a MCC
>>
>> The Maximum Number of Captures MCC attribute indicates the maximum
>> number of individual captures that may appear in a Capture Encoding at a
>> time. It may be used to derive how the Single Media Captures within the
>> MCC are composed / switched with regards to space and time.
>>
>> <<<A Provider can indicate that the number of captures in a MCC capture
>> encoding is equal "=" to the MaxCaptures value or that there may be any
>> number of captures up to and including "<=" the MaxCaptures value. This
>> allows a Provider to distinguish between a MCC that purely represents a
>> composition of sources versus a MCC that represents switched or switched
>> and composed sources.>>>
>>
>> Max Captures MAY be set to one so that only content related to one of the
>> sources are shown in the MCC Capture Encoding at a time or it may be set to
>> any value up to the total number of Source Media Captures in the MCC.
>>
>> <<<The bullets below describe how the setting of MaxCapture versus the
>> number of captures in the MCC affects how sources appear in a capture
>> encoding:
>>
>> o When MaxCaptures is set to <= 1 and the number of captures in the MCC is
>> greater than 1 in the MCC this is a switched case. Zero or 1 capture may be
>> switched into the capture encoding. Note: zero is allowed because of the
>> "<=".
>>
>> o When MaxCaptures is set to = 1 and the number of captures in the MCC is
>> greater than 1 in the MCC this is a switched case. Only one capture source is
>> contained in a capture encoding at a time.
> [Duckworth, Mark] I suggest modifying these first two bullets:
> o When MaxCaptures is set to <= 1 and the number of captures in the MCC is greater than 1 (or not specified) this is a switched case. Zero or 1 capture may be switched into the capture encoding. Note: zero is allowed because of the "<=".
>
> o When MaxCaptures is set to = 1 and the number of captures in the MCC is greater than 1 (or not specified) this is a switched case. Only one capture source is contained in a capture encoding at a time.
[CNG] Good clarification.
>
>> o When MaxCaptures is set to <= 2 and the number of captures in the MCC is
>> greater than 2 this is a switched and composed case. The capture encoding
>> may contain purely switched sources (i.e. <=2 allows for 1 source on its own),
>> or may contain composed and switched sources (i.e. a composition of 2
>> sources switched between the sources).
>>
>> o When MaxCaptures is set to = 2 and the number of captures in the MCC is
>> greater than 2 this is a switched and composed case. The capture encoding
>> contains composed and switched sources (i.e. a composition of 2 sources
>> switched between the sources). It is not possible to have a single source.
> [Duckworth, Mark] It sounds like these two paragraphs above apply not only for the value 2, but more generally to any value >=2.  Is that your intent?
[CNG] Yes that is the intent.
>
> Also I suggest including in the above two bullets the case where the number of captures in the MCC is not specified.  Or we could write it as separate bullets like this:
>
> o When MaxCaptures is set to <= 2 (or any number greater than 2) and the number of captures in the MCC is not specified this is a switched and composed case. The capture encoding may contain purely switched sources (i.e. <=2 allows for 1 source on its own), or may contain composed and switched sources (i.e. a composition of 2 sources switched between the sources).
>
> o When MaxCaptures is set to = 2 (or any number greater than 2) and the number of captures in the MCC is not specified this is a composed case, and may also be switched.
[CNG] Sounds good.
>   
>> o When MaxCaptures is set to <= to the number of captures in the MCC this
>> is a switched and composed case. The capture encoding may contain media
>> switched between any number (up to the MaxCaptures) of composed
>> sources.
>>
>> o When MaxCaptures is set to = to the number of captures in the MCC this is
>> a composed case. All the sources are composed into a single capture
>> encoding.>>>
>>
>> If this attribute is not set then as default it is assumed that all source content
>> can appear concurrently in the Capture Encoding associated with the MCC.
>>
>> ...
>>
>> In section 10:
>>
>> - The Consumer may or may not choose to receive all the indicated captures.
>> Therefore it can choose to receive a sub-set ofCaptures indicated by the
>> MCC. <<<Where a MCC indicates that the MaxCaptures is equal to a
>> particular number of captures and the Consumer wishes to select a sub-set
>> of captures, the number of captures it selects should at minimum be equal to
>> MaxCaptures value.>>>
>>
>>
>> Christian
>>
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