[SailfishDevel] Camera flash control. Wired to Qt level or not?

Sat Nov 16 15:58:30 UTC 2013

Can you explain why Fixed (manual) focus mode? :/
Sorry to ask for details, it's a little difficult without the device at
hand?

Are you trying to tell that in a Fixed mode camera will seek for focus
forever?

Artem.

On Sat, Nov 16, 2013 at 5:55 PM, Mohammed Hassan <
mohammed.hassan at jollamobile.com> wrote:

> searchAndLock() should work as long as you are in a dark
> place (that's what LED torch is for ;-))
> and make sure the focus mode is set to fixed focus mode.
>
> Good luck!
>
> Cheers,
>
> On Sat, Nov 16, 2013 at 05:35:47PM +0200, Artem Marchenko wrote:
> >  I used to work a little with GStreamer in the past, it wasn't much fun,
> >  though I was doing video processing, not just LED manipulation..
> >  Oh well, I try searchAndLock trick, if it doesn't work, I'll need to
> >  think if I am into diving to gstreamer or into waiting for the Torch
> >  API. Technically, waiting for Torch is correct probably, I am just
> >  driven by the opportunity to make the very first torch for Jolla :)
> >  Cheers,
> >  Artem.
> >
> >  On Sat, Nov 16, 2013 at 5:28 PM, Mohammed Hassan
> >  <[1]mohammed.hassan at jollamobile.com> wrote:
> >
> >  Hi Artem,
> >
> >  On Sat, Nov 16, 2013 at 04:43:57PM +0200, Artem Marchenko wrote:
> >  > Thanks, Mohammed.
> >  >
> >  > I know that torch mode is not supported, but ON mode is. So my
> >  current
> >  > workaround idea is to make phone think it shoots video with flash
> >  mode
> >  > ON (ok, we can even shoot video for real if needed). Assumption is
> >  that
> >  > video + flash mode ON should make phone record video with light
> >  > constantly ON. Currently it doesn't work for me, maybe because
> >  > assumption is wrong or maybe I am just using some api the wrong way.
> >
> >  It will not work that way. There is a special mode for torch light
> >  but it's
> >  not yet been implemented.
> >
> >  > 2nd workaround idea is to make phone seekAndLock all the time
> >  causing
> >  > flash to be ON. That is likely to result in a multitude of short
> >  > flashes though.
> >
> >  That can work but it will be slow "light bursts".
> >  A 3rd option would be going even below GSTreamer and Qt and talk to
> >  the camera HW directly.
> >  This is harder -trust me- and will tie you to the hardware.
> >  I am really sorry I don't have a solution for you :(
> >  I can only promise it will be available soon in an update.
> >  Cheers,
> >
> >  > When you record video with the flash ON in a system camera app, does
> >  it
> >  > cause LED to have kith ON all the time?
> >  >
> >  > Artem.
> >  >
> >  > On Saturday, November 16, 2013, Mohammed Hassan wrote:
> >  >
> >  > Hi Artem,
> >  > On Sat, Nov 16, 2013 at 02:48:30PM +0200, Artem Marchenko wrote:
> >  > > Hi All
> >  > > *Context*
> >  > > I am trying to build a flashlight app, but the same question is
> >  > valid
> >  > > for any camera app that wants to shoot photos/videos in low
> >  > light.
> >  > > *The problem*
> >  > > I am trying to control LED flash by setting flash mode to ON (api
> >  > > confirms that ON mode is supported) and starting camera. Nothing
> >  > > happens. I also tried actually capturing photo, shooting video
> >  > and
> >  > > seekAndLocking. I don't have a device myself, but kind people on
> >  > IRC
> >  > > told that only two short LED flashes happen (during seeking for
> >  > focus
> >  > > probably).
> >  > > Could somebody, please, advise how to control flash in Sailfish
> >  > OS? Or
> >  > > maybe you could confirm that libhybris flash control just isn't
> >  > wired
> >  > > to Qt level?
> >  > This is unfortunately not supported.
> >  > The only flash modes supported now are: on, off or auto.
> >  > Torch light mode is not yet supported but I assure you it will come
> >  > in an update soon.
> >  > I am not that familiar with Qt but I know it's a limitation of the
> >  > layer underneath Qt.
> >  > The best you can do now is to wait for the phone itself and tinker
> >  > as you like and I am
> >  > sure you will manage to do it :-)
> >  > Cheers,
> >  > P.S. libhybris camera wrapper is not used by sailfish. It might or
> >  > might not work.
> >  > _______________________________________________
> >  > SailfishOS.org Devel mailing list
> >  >
> >  > --
> >  > Artem Marchenko
> >
> >  > [1][2]http://agilesoftwaredevelopment.com
> >  > [2][3]http://twitter.com/AgileArtem
> >  >
> >  > References
> >  >
> >  > 1. [4]http://agilesoftwaredevelopment.com/
> >  > 2. [5]http://twitter.com/AgileArtem
> >
> >  --
> >  Artem Marchenko
> >  [6]http://agilesoftwaredevelopment.com
> >  [7]http://twitter.com/AgileArtem
> >
> > References
> >
> >  1. mailto:mohammed.hassan at jollamobile.com
> >  2. http://agilesoftwaredevelopment.com/
> >  3. http://twitter.com/AgileArtem
> >  4. http://agilesoftwaredevelopment.com/
> >  5. http://twitter.com/AgileArtem
> >  6. http://agilesoftwaredevelopment.com/
> >  7. http://twitter.com/AgileArtem
>

-- 
Artem Marchenko
http://agilesoftwaredevelopment.com
http://twitter.com/AgileArtem
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