On Fri April 12 2013 11:31:36 Laurent Pinchart wrote: > On Wednesday 10 April 2013 09:27:07 Hans Verkuil wrote: > > Hi all, > > > > Just in case someone has time to work on this: I thought I'd write down some > > of the ideas I have to improve the streaming code in v4l2-ctl: > > > > 1) Add an option to select between limited and full range colors. > > > > 2) Add more test patterns: > > - solid colors: black, white, red, green, blue, cyan, yellow, magenta. > > - grey 'color' bar > > - grey ramp > > - a pattern containing SAV and EAV codes in each plane (perhaps this > > should be a separate option, 'overlaying' those codes): this is a very > > nasty test case that can be used to test proper handling of such codes > > in an image. > > - moving patterns > > - horizontal colorbars > > - thin lines: horizontal, vertical, both. > > - random contents > > I've implemented support for generating test patterns in both my fbdev-test > program (http://git.ideasonboard.org/fbdev-test.git) and in the libdrm > modetest program. Maybe we should consider splitting that to a shared library. Good to know. One idea I have is to split off test pattern generation from vivi into its own source and sync that with v4l-utils ('make sync-with-kernel'). Having both vivi and a v4l-utils test-pattern library support the same patterns/formats would be beneficial in my opinion. Regards, Hans > > > 3) For the capture side add pattern validation: check that the contents you > > captured matches the given pattern. Very useful for testing. > > > > 4) Add support for capturing/displaying frames with different sizes (e.g. > > compressed streams). Currently the output just appends all planes/frames > > together without writing the plane/frame sizes anywhere. The input > > assumes fixed sized planes/frames. We probably need to add a meta file that > > contains the 'bytesused' values. Perhaps that file should also contain > > format information that can be used later. > > > > 5) Add some support to give keyboard commands when streaming. E.g. 'q' to > > stop streaming gracefully (and so also ensure that all the data is written > > to file, something that doesn't happen with ctrl-c). > > > > Other commands for the future are encoder/decoder commands such as > > speeding up or down. > > > > 6) MPEG encoders can generate an index file (VIDIOC_G_ENC_INDEX). Add an > > option to generate that and to use it when decoding. I actually have some > > old test application that does just that, and that also has encoder/decoder > > command support (see item 5 above): http://ivtvdriver.org/svn/ivtvtv > > > > 7) Add VBI streaming support. Split off the VBI code from qv4l2 into a > > library and use that in v4l2-ctl to slice the raw VBI and to interpret the > > data. That should replace the vbi-test.c, sliced-vbi-detect.c and > > sliced-vbi-test.c utilities in contrib. > > -- 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
