Hello, My goal is to better understand how to write an application that makes use of the omap3isp and media controller frameworks and v4l2. I'm attempting to make use of Laurent's omap3-isp-live example application as a starting point and play with the AEC/WB capability. My problem is that when I start the live application, the display turns blue (it seems when the chromakey fill is done), but no video appears on the display. I do think that I'm getting good (or at least statistics) from the ISP because I can change the view in front of the camera (by putting my hand in front of the lens) and the gain settings change. root@beagleboard:~# live Device /dev/video6 opened: OMAP3 ISP resizer output (media). viewfinder configured for 2011 1024x768 AEWB: #win 10x7 start 16x74 size 256x256 inc 30x30 Device /dev/video7 opened: omap_vout (). 3 buffers requested. Buffer 0 mapped at address 0x40279000. Buffer 1 mapped at address 0x40402000. Buffer 2 mapped at address 0x4059e000. 3 buffers requested. Buffer 0 valid. Buffer 1 valid. Buffer 2 valid. AE: factor 3.1250 exposure 2000 sensor gain 12 AE: factor 1.6018 exposure 2000 sensor gain 19 AE: factor 1.1346 exposure 2000 sensor gain 21 AE: factor 1.0446 exposure 2000 sensor gain 21 AE: factor 1.0448 exposure 2000 sensor gain 21 AE: factor 1.0444 exposure 2000 sensor gain 21 AE: factor 1.0443 exposure 2000 sensor gain 21 AE: factor 1.0445 exposure 2000 sensor gain 21 AE: factor 1.0438 exposure 2000 sensor gain 21 AE: factor 1.0448 exposure 2000 sensor gain 21 AE: factor 1.0461 exposure 2000 sensor gain 21 AE: factor 1.0897 exposure 2000 sensor gain 22 AE: factor 2.6543 exposure 2000 sensor gain 58 < Me obstructing the camera FOV using my hand causes the factor and gain to rise AE: factor 1.2345 exposure 2000 sensor gain 71 < AE: factor 1.1631 exposure 2000 sensor gain 82 < AE: factor 0.9797 exposure 2000 sensor gain 80 < AE: factor 0.9709 exposure 2000 sensor gain 77 < frame rate: 6.597745 fps AE: factor 0.9633 exposure 2000 sensor gain 74 < AE: factor 0.6130 exposure 2000 sensor gain 45 < AE: factor 0.9271 exposure 2000 sensor gain 41 < AE: factor 1.0130 exposure 2000 sensor gain 41 < AE: factor 1.0504 exposure 2000 sensor gain 43 < AE: factor 1.0411 exposure 2000 sensor gain 44 < AE: factor 1.0271 exposure 2000 sensor gain 45 < AE: factor 1.0602 exposure 2000 sensor gain 47 < AE: factor 1.1278 exposure 2000 sensor gain 53 < AE: factor 1.1870 exposure 2000 sensor gain 62 < AE: factor 1.1074 exposure 2000 sensor gain 68 < AE: factor 1.0716 exposure 2000 sensor gain 72 < AE: factor 0.4074 exposure 2000 sensor gain 29 < AE: factor 0.8033 exposure 2000 sensor gain 23 AE: factor 0.9741 exposure 2000 sensor gain 22 AE: factor 1.0115 exposure 2000 sensor gain 22 I did have to change the omap_vout driver slightly to increase the buffer size. I was getting errors in the application attempted to allocate USERPTR buffers for 1024x768 frames: root@beagleboard:~# live Device /dev/video6 opened: OMAP3 ISP resizer output (media). viewfinder configured for 2011 1024x768 AEWB: #win 10x7 start 16x74 size 256x256 inc 30x30 Device /dev/video7 opened: omap_vout (). 3 buffers requested. Buffer 0 mapped at address 0x40302000. Buffer 1 mapped at address 0x404df000. Buffer 2 mapped at address 0x4066e000. 3 buffers requested. Buffer 0 too small (1572864 bytes required, 1474560 bytes available.) So, I changed drivers/media/video/omap/omap_voutdef.h to increase the buffer size slightly. /* Max Resolution supported by the driver */ #define VID_MAX_WIDTH 1280 /* Largest width */ #define VID_MAX_HEIGHT 768 /* Largest height */ <-- Was 720 I'm pretty sure that wasn't the only way to solve the problem, but it did allow the live application to run without errors. I am using a patched variant of the current Angstrom mainline (3.2.16) with the MT9P031 sensor and a DVI display on Beagleboard-xM and am able to run the following commands and see a live video stream on the display. I suspect that this indicates that hardware setup works: media-ctl -v -r -l '"mt9p031 2-0048":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 -v -f '"mt9p031 2-0048":0 [SGRBG12 1024x768], "OMAP3 ISP CCDC":2 [SGRBG10 1024x768], "OMAP3 ISP preview":1 [UYVY 10006x760], "OMAP3 ISP resizer":1 [UYVY 1024x768]' yavta -f UYVY -s 1024x768 -n 8 --skip 3 --capture=1000 --stdout /dev/video6 | mplayer - -demuxer rawvideo -rawvideo w=1024:h=768:format=uyvy -vo fbdev Thanks for any tips or assistance! John -- 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
