On Mon, 28 Feb 2011, Guennadi Liakhovetski wrote:

On Mon, 28 Feb 2011, Hans Verkuil wrote:

quoted

Does anyone know which drivers stop capture if there are no buffers available? 
I'm not aware of any.

Many soc-camera hosts do that.

quoted

I think this is certainly a good initial approach.

Can someone make a list of things needed for flash/snapshot? So don't look yet 
at the implementation, but just start a list of functionalities that we need 
to support. I don't think I have seen that yet.

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)
* trigger pin / command
* external exposure
* exposure mode (ERS, GRR,...)
* use "trigger" or "shutter" for readout
* number of frames to capture

Add

* multiple videobuffer queues

to the list

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/