Em Fri, 9 Nov 2012 17:37:42 +0100 Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> escreveu: > Em Thu, 08 Nov 2012 19:34:14 +0100 > Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> escreveu: > > > On Thursday 08 November 2012 19:14:18 Laurent Pinchart wrote: > > > Hi Mauro, > > > > > > Here's the application I've used to test V4L2 dma-buf support with a UVC > > > webcam and an Intel GPU supported by the i915 driver. > > > > > > The kernel code is available in my git tree at > > > > > > git://linuxtv.org/pinchartl/media.git devel/dma-buf-v10 > > > > > > (http://git.linuxtv.org/pinchartl/media.git/shortlog/refs/heads/devel/v4l2- > > > clock) > > > > > > Don't forget to enable dma-buf and UVC support when compiling the kernel. > > > > > > The userspace code is based on the v4l2-drm-example application written by > > > Tomasz (the original code is available at > > > git://git.infradead.org/users/kmpark/public-apps). I need to clean up my > > > modifications to push them back to the repository, in the meantime the code > > > is attached to this e-mail. > > > > > > To compile the application, just run make with the KDIR variable set to the > > > path to your Linux kernel tree with the dma-buf patches applied. Don't > > > forget to make headers_install in the kernel tree as the Makefile will look > > > for headers in $KDIR/usr. > > > > > > You will need a recent version of libdrm with plane support available. > > > 2.4.39 should do. > > > > > > The following command line will capture VGA YUYV data from the webcam and > > > display it on the screen. You need to run it in a console as root without > > > the X server running. > > > > > > ./dmabuf-sharing -M i915 -o 7:3:1600x900 -i /dev/video0 -S 640,480 -f YUYV > > > -F YUYV -s 640,480@0,0 -t 640,480@0,0 -b 2 > > > > I forgot to mention that the -o parameter takes the connector ID, CRTC ID and > > mode as parameters. The mode is easy to find, but the connector and CRTC IDs > > are a bit more tricky. You can run the modetest application (part of libdrm > > but not installed by most distributions, so a manual compilation is needed) to > > dump all CRTC, encoder and connector information to the console. Pick the > > connector associated with your display, and the CRTC associated with the > > encoder associated with that connector. > > Got modetest running, but I didn't figure out what of the values below should be > used for the -o parameter: > > trying to load module i915...success. > Encoders: > id crtc type possible crtcs possible clones > 6 3 LVDS 0x00000003 0x00000001 > 13 0 DAC 0x00000003 0x00000002 > 15 0 TVDAC 0x00000003 0x00000004 > > Connectors: > id encoder status type size (mm) modes encoders > 5 6 connected LVDS 290x180 1 6 > modes: > name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot) > 1280x800 60 1280 1328 1360 1448 800 803 809 823 flags: nhsync, nvsync; type: preferred, driver > props: > 1 EDID: > flags: immutable blob > blobs: > > value: > 00ffffffffffff0006af241400000000 > 01110103801d12780a87f594574f8c27 > 27505400000001010101010101010101 > 010101010101ee1b00a8502017303020 > 360022b410000019ee1b00a850201730 > 3020360022b410000000000000fe0044 > 573930398042313333455731000000fe > 00000000000000000001010a20200022 > 2 DPMS: > flags: enum > enums: On=0 Standby=1 Suspend=2 Off=3 > value: 0 > 7 scaling mode: > flags: enum > enums: None=0 Full=1 Center=2 Full aspect=3 > value: 3 > 12 0 disconnected VGA 0x0 0 13 > 14 0 disconnected s-video 0x0 0 15 > > CRTCs: > id fb pos size > 3 9 (0,0) (0x0) > 1280x800 60 1280 1328 1360 1448 800 803 809 823 flags: nhsync, nvsync; type: preferred, driver > props: > 4 0 (0,0) (0x0) > 0 0 0 0 0 0 0 0 0 flags: ; type: > props: > > Planes: > id crtc fb CRTC x,y x,y gamma size > > Frame buffers: > id size pitch FYI, this is that I'm getting there: # ./dmabuf-sharing -M i915 -o 5:3:1280x800 -i /dev/video0 -S 640,480 -f YUYV -F YUYV -s 640,480@0,0 -t 640,480@0,0 -b 2 G_FMT(start): width = 640, height = 480, 4cc = YUYV G_FMT(final): width = 640, height = 480, 4cc = YUYV size = 614400 pitch = 1280 bo 1 640x480 bpp 16 size 614400 (614400) dbuf_fd = 5 bo 2 640x480 bpp 16 size 614400 (614400) dbuf_fd = 6 buffers ready WARN(dmabuf-sharing.c:278): connector 5 is not supported ERROR(dmabuf-sharing.c:441) : failed to find valid mode Cheers, Mauro -- 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
