Hi Gary, On Wednesday 31 August 2011 12:56:29 Gary Thomas wrote: > On 2011-08-31 02:13, Laurent Pinchart wrote: > > On Wednesday 31 August 2011 02:07:36 Gary Thomas wrote: > >> On 2011-08-30 16:50, Laurent Pinchart wrote: > >>> On Wednesday 31 August 2011 00:45:39 Gary Thomas wrote: > >>>> On 2011-08-29 04:49, Laurent Pinchart wrote: > >>>>> On Thursday 25 August 2011 18:07:38 Gary Thomas wrote: > >>>>>> Background: I have working video capture drivers based on the > >>>>>> TI PSP codebase from 2.6.32. In particular, I managed to get > >>>>>> a driver for the TVP5150 (analogue BT656) working with that kernel. > >>>>>> > >>>>>> Now I need to update to Linux 3.0, so I'm trying to get a driver > >>>>>> working with the rewritten ISP code. Sadly, I'm having a hard > >>>>>> time with this - probably just missing something basic. > >>>>>> > >>>>>> I've tried to clone the TVP514x driver which says that it works > >>>>>> with the OMAP3 ISP code. I've updated it to use my decoder device, > >>>>>> but I can't even seem to get into that code from user land. > >>>>>> > >>>>>> Here are the problems I've had so far: > >>>>>> * udev doesn't create any video devices although they have > >>>>>> been > >>>>>> > >>>>>> registered. I see a full set in /sys/class/video4linux > >>>>>> > >>>>>> # ls /sys/class/video4linux/ > >>>>>> v4l-subdev0 v4l-subdev3 v4l-subdev6 video1 > >>>>>> video4 v4l-subdev1 v4l-subdev4 v4l-subdev7 video2 > >>>>>> video5 v4l-subdev2 v4l-subdev5 video0 video3 > >>>>>> video6 > >>>>> > >>>>> It looks like a udev issue. I don't think that's related to the > >>>>> kernel drivers. > >>>>> > >>>>>> Indeed, if I create /dev/videoX by hand, I can get > >>>>>> somewhere, but I don't really understand how this is > >>>>>> supposed to work. e.g. > >>>>>> > >>>>>> # v4l2-dbg --info /dev/video3 > >>>>>> > >>>>>> Driver info: > >>>>>> Driver name : ispvideo > >>>>>> Card type : OMAP3 ISP CCP2 input > >>>>>> Bus info : media > >>>>>> Driver version: 1 > >>>>>> Capabilities : 0x04000002 > >>>>>> > >>>>>> Video Output > >>>>>> Streaming > >>>>>> > >>>>>> * If I try to grab video, the ISP layer gets a ton of > >>>>>> warnings, but > >>>>>> > >>>>>> I never see it call down into my driver, e.g. to check the > >>>>>> current format, etc. I have some of my own code from before > >>>>>> which fails miserably (not a big surprise given the hack > >>>>>> level of those programs). > >>>>>> > >>>>>> I tried something off-the-shelf which also fails pretty bad: > >>>>>> # ffmpeg -t 10 -f video4linux2 -s 720x480 -r 30 -i > >>>>>> /dev/video2 > >>>>>> > >>>>>> junk.mp4 > >>>>>> > >>>>>> I've read through Documentation/video4linux/omap3isp.txt without > >>>>>> learning much about what might be wrong. > >>>>>> > >>>>>> Can someone give me some ideas/guidance, please? > >>>>> > >>>>> In a nutshell, you will first have to configure the OMAP3 ISP > >>>>> pipeline, and then capture video. > >>>>> > >>>>> Configuring the pipeline is done through the media controller API and > >>>>> the V4L2 subdev pad-level API. To experiment with those you can use > >>>>> the media-ctl command line application available at > >>>>> http://git.ideasonboard.org/?p=media- ctl.git;a=summary. You can run > >>>>> it with --print-dot and pipe the result to dot -Tps to get a > >>>>> postscript graphical view of your device. > >>>>> > >>>>> Here's a sample pipeline configuration to capture scaled-down YUV > >>>>> data from a sensor: > >>>>> > >>>>> ./media-ctl -r -l '"mt9t001 3-005d":0->"OMAP3 ISP CCDC":0[1], "OMAP3 > >>>>> ISP CCDC":2->"OMAP3 ISP preview":0[1], "OMAP3 ISP preview":1->"OMAP3 > >>>>> ISP resizer":0[1], "OMAP3 ISP resizer":1->"OMAP3 ISP resizer > >>>>> output":0[1]' ./media-ctl -f '"mt9t001 3-005d":0[SGRBG10 1024x768], > >>>>> "OMAP3 ISP CCDC":2[SGRBG10 1024x767], "OMAP3 ISP preview":1[YUYV > >>>>> 1006x759], "OMAP3 ISP resizer":1[YUYV 800x600]' > >>>>> > >>>>> After configuring your pipeline you will be able to capture video > >>>>> using the V4L2 API on the device node at the output of the pipeline. > >>>> > >>>> Getting somewhere now, thanks. When I use this full pipeline, I can > >>>> get all the way into my driver where it's trying to start the data. > >>>> > >>>> What if I want to use less of the pipeline? For example, I'd normally > >>>> be happy with just the CCDC output. How would I do that? > >>> > >>> Then connect CCDC's pad 1 to the CCDC output video node and capture on > >>> that video node. > >>> > >>>> What pixel format would I use with ffmpeg? > >>> > >>> What does your subdev deliver ? > >> > >> It's a BT656 encoder - 8-bit UYVY 4:2:2 > > > > Then you will first have to add YUV support to the CCDC. It wouldn't be > > fun if it worked out of the box, would it ? :-) > > So, functionality that was present in 2.6.32 (TI PSP version at least) > is not currently available?
That's right. You can blame TI for not pushing it to mainline :-) -- Regards, Laurent Pinchart -- 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
