Dne Po 7. září 2009 08:22:22 Guennadi Liakhovetski napsal(a): > On Mon, 7 Sep 2009, Marek Vasut wrote: > > Dne Ne 6. zářà 2009 20:15:17 Guennadi Liakhovetski napsal(a): > > > On Sun, 6 Sep 2009, Marek Vasut wrote: > > > > Dne Ne 6. zářà 2009 18:52:55 Guennadi Liakhovetski napsal(a): > > > > > On Sun, 6 Sep 2009, Marek Vasut wrote: > > > > > > Ah damn, I see what you mean. What the camera does is it swaps > > > > > > the RED and BLUE channel: > > > > > > 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 > > > > > > B4 B3 B2 B1 B0 G4 G3 G2 G1 G1 R4 R3 R2 R1 R1 -- > > > > > > so it's more a BGR555/565 then. I had to patch fswebcam for this. > > > > > > > > > > Ok, this is, of course, something different. In this case you, > > > > > probably, could deceive the PXA to handle blue as red and the other > > > > > way round, but still, I would prefer not to do that. Hence my > > > > > suggestion remains - pass these formats as raw data. > > > > > > > > Which is bogus from the camera point of view. > > > > > > Not at all. This just means: the subdevice provides a pixel format, > > > that the bridge (PXA) knows nothing specific about, but it can just > > > pass it one-to-one (as raw data) to the user - don't see anything bogus > > > in this. Different bridges have support for different pixel colour > > > formats, but, I think, all bridges can pass data as raw (pass-through). > > > Some bridges can _only_ do this, so, this is actually the default > > > video-capture mode. > > > > But then you'll have to tell your software how to process the raw data > > (in what format they are). If there was this RGB565X passthrough support, > > the software could at least check if you are not forcing it to process > > nonsense. > > There's no difference for user-space software. It requests BGR555 it gets > BGR555 back, because that's the information the pxa driver will find in > this format descriptor: if you take this data and put it in RAM in a > certain way, you get BGR555. How's it supposed to get BGR555 if the pxa-camera doesnt support that ? Will the v4l2 layer convert it or something ? > > Thanks > Guennadi > --- > Guennadi Liakhovetski, Ph.D. > Freelance Open-Source Software Developer > http://www.open-technology.de/ -- 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
