Hi Jon, We're dealing with a via-camera issue from the Scratch application. The latest version of scratch uses libv4l2 and requests RGB24 images as that is what it uses internally.
via-camera/ov7670 doesn't support RGB24 but libv4l2 kicks in with its format conversion and chooses RGB565, which we do support. The catch is that Scratch requests 320x240 video. You probably recall that you made via-camera only ever request 640x480 from ov7670, but you also made via-camera offer discontinuous sizes and you used the via-camera hardware to scale the image to the appropriate size (viacam_set_scale). This scaling seems to work fine with YUYV, but fails with RGBA. Test case: gst-launch v4l2src ! video/x-raw-rgb,bpp=16,width=320,height=240 ! ffmpegcolorspace ! xvimagesink The colours in the resultant image wrong (lots of green). Change to 640x480, everything fine. The only documentation I can find on this is the "Chrome9 HCM Graphics Processor Programming Manual" which really doesn't explain much about the camera hardware apart from a bare set of register descriptions. What algorithm does that scaling functionality use, how does it know which format the image is in? Is there further documentation or are we stuck with this? If we're stuck with it, we have the options of solving this either by disabling everything other than YUYV (which scales fine), or just by disabling the scaling and locking to 640x480. Thoughts/other ideas? Unless I'm missing something, there doesn't seem a way to express in the V4L2 API that RGB is only available at 640x480 while YUYV is available at a range of sizes. Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
