Re: Syntax of new constraint proposal

Silvia, my apologies. You' think I'd get other people's names right more 
often.

.: Jan-Ivar :.

On 5/19/14 11:17 AM, Jan-Ivar Bruaroey wrote:
> On 5/19/14 6:00 AM, Harald Alvestrand wrote:
>> In neither case are the semantics of "ideal" defined.
>> [...]
>> does it mean "I prefer values that tend towards this value
>> rather than the "natural" direction (presumably higher), but any value
>> in the range is OK",
>
> That one I think. - I'm not on Sylvia's page here, but several people 
> have mentioned "ideal", so let me answer with my idea of the 
> definition, which I used a couple of months ago.
>
> Extension 2 of that proposal ("ideal") still seems relevant if read in 
> isolation, even though the surrounding syntax is not exactly the same. 
> Excerpted from 
> http://lists.w3.org/Archives/Public/public-media-capture/2014Mar/0083.html 
> :
>
> Extension #2: ideal
> ===================
>
> dictionary ConstrainLongRange {
>       long min;
>       long max;
>       long ideal;
> };
>
> dictionary ConstrainDoubleRange {
>       double min;
>       double max;
>       double ideal;
> };
>
> Ideal expresses a target value within an acceptable range, with values
> closer to the ideal more desirable.
>
> For example, clients may use this to express preference for higher values:
>
>     var constraints =
>     {
>         aspectRatio: 16/9,
>         frameRate: { min: 60, max: 300, ideal: 300 },
>     };
>     navigator.getUserMedia(constraints, success, failure);
>
> Only min and max need to be satisfied to satisfy a constraint, but
> sources satisfied by the same range are individually ranked by their
> proximity to the ideal. [2]
>
> This example ranks 16/9 sources with frame-rates closest to 300hz
> highest, followed by gradually lower frame-rate 16:9 ones down to 60hz,
> followed by all other aspects 300hz and down.
>
> ---
> [2] Ideal algorithm: For example, if three sources satisfy the frameRate
> constraint above, the one with the lowest frame-rate among them gets 1/3
> point, the middle one gets 2/3 points and the highest frame-rate one
> gets one point.
>
> (slides: 
> http://lists.w3.org/Archives/Public/public-media-capture/2014Mar/att-0139/Constraints2014.pdf 
> )
>
> .: Jan-Ivar :.
>


-- 
.: Jan-Ivar :.