W3C home > Mailing lists > Public > public-media-capture@w3.org > January 2013

Video Controls

From: Cullen Jennings (fluffy) <fluffy@cisco.com>
Date: Thu, 3 Jan 2013 01:32:37 +0000
To: "public-media-capture@w3.org" <public-media-capture@w3.org>
Message-ID: <C5E08FE080ACFD4DAE31E4BDBF944EB11332BBB0@xmb-aln-x02.cisco.com>

Here are roughly what I think we need  - yes there are lots more but this would give a pretty good starting point for version 1.0 and of course whatever we do has to be easily extensible with new ones. 


resolution

read min,max resolution 

color space (short enumeration list )

min, max, average bitrate 

auto exposure: off, on shutter priority, on aperture priority, on 
 
auto focus: off, on, on macro, on close, on far 

exposure time

frame rate 

focus 

aperture (control of lens iris if not fixed)

zoom

pan / tilt  / roll 

read of privacy control (tells you if the camera privacy shade is over it or not)

digital crop, zoom

auto backlight compensation: off, on 

gain or exposure 

sharpness

gama

auto white balance: off, on 

white point, black point 

low delay mode: off , on 

compression quality ( float 0 to 1 ) bad image low bitrate, 1 good image high bitrate 

bit depth of luma  and chroma

flash: yes, no, auto 

read pixel aspect ratio 

copy protection bit (sorry, bad joke but had to include it)

maxMB/s 


On the topic of camera facing, I prefer to use the SDP content registry and extend it to have front, back, left, right, document camera etc. then have way to use that as a constraint. 

On the topic of "sourceId" type thing - yes we need a stable device name and we need privacy aspects consider. Dan I have some proposal on that is basically to take the long term UUID for the device and hash it with origin domain or something like that. 

Given that HDR cameras are becoming more common, I suspect that is best dealt with by just setting the bit depth of the pixels but arguments could be made for other ways to dealing this.

I've ignored setting needed for 3D / stereo cameras. 
Received on Thursday, 3 January 2013 01:33:16 GMT

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