Hi Sergio, On 05/01/2012 09:08 PM, Aguirre, Sergio wrote: > Hi all, > > I wonder if there's an example app for v4l2 devices with > V4L2_CAP_VIDEO_CAPTURE_MPLANE capability? > (like capture.c in V4L2 API docs) There isn't at the V4L2 API docs, it probably makes sense to add one though. I'll try to find a time to prepare a patch for that. A very simple application with V4L2_CAP_VIDEO_CAPTURE_MPLANE support can be found here: http://thread.gmane.org/gmane.comp.video.dri.devel/65997 It might be not that straightforward since there is the DMABUF memory type used. Some more applications using multi-plane API are available at: http://git.infradead.org/users/kmpark/public-apps An MMAP memory example can be found here: http://git.infradead.org/users/kmpark/public-apps/blob/9c057b001e8873861a70f7025214003837a0860b:/v4l2-mfc-example/mfc.c Please see mfc_dec_setup_capture function. > Also, does it have to be mutually exclusive with a > V4L2_CAP_VIDEO_CAPTURE device? No, the driver could support both. But it generally makes sense to implement only _mplane ioctls at drivers. The multi/single-plane conversion should be done in user space. There were some patches for libv4l to support that (http://www.spinics.net/lists/linux-media/msg35080.html), but such conversions are not yet supported in the v4l libraries yet AFAIK. I'm also not sure how is V4L2_CAP_VIDEO_CAPTURE_MPLANE handled in standard GStreamer plugins like v4l2src at the moment, having only multi-plane interface at the driver might cause additional problems there. -- Regards, Sylwester -- 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
