Hi Andy, On Thursday 03 March 2011 02:05:00 Andy Walls wrote: > On Wed, 2011-03-02 at 19:19 +0100, Hans Verkuil wrote: > > On Wednesday, March 02, 2011 18:51:43 Guennadi Liakhovetski wrote: > > > ...Just occurred to me: > > > > > > On Mon, 28 Feb 2011, Guennadi Liakhovetski wrote: > > > > On Mon, 28 Feb 2011, Guennadi Liakhovetski wrote: > > > > > On Mon, 28 Feb 2011, Hans Verkuil wrote: > > > > > > > > > > These are not the features, that we _have_ to implement, these are > > > > > just the ones, that are related to the snapshot mode: > > > > > > > > > > * flash strobe (provided, we do not want to control its timing from > > > > > > > > > > generic controls, and leave that to "reasonable defaults" or to > > > > > private controls) > > I consider a flash strobe to be an illuminator. I modifies the subject > matter to be captured in the image. > > > > Wouldn't it be a good idea to also export an LED (drivers/leds/) API > > > from our flash implementation? At least for applications like torch. > > > Downside: the LED API itself is not advanced enough for all our uses, > > > and exporting two interfaces to the same device is usually a bad idea. > > > Still, conceptually it seems to be a good fit. > > > > I believe we discussed LEDs before (during a discussion about adding > > illuminator controls). I think the preference was to export LEDs as V4L > > controls. > > That is certainly my preference, especially for LED's integrated into > what the end user considers a discrete, consumer electronics device: > e.g. a USB connected webcam or microscope. > > I cannot imagine a real use-case repurposing the flash strobe of a > camera purposes other than subject matter illumination. (Inducing > seizures? An intrusion detection systems alarm that doesn't use the > camera to which the flash is connected?) > > For laptop frame integrated webcam LEDs, I can understand the desire to > perhaps co-opt the LED for some other indicator purpose. A WLAN NIC > traffic indicator was suggested previously. > > Does anyone know of any example where it could possibly make sense to > repurpose the LED of a discrete external camera or capture device for > some indication other than the camera/capture function? (I consider > both extisngishing the LED for lighting purposes, and manipulating the > LED for the purpose of deception of the actual state of the > camera/capture function, still related to the camera function.) What about using the flash LED on a cellphone as a torch ? -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
