Hi Ricardo, Memory-to-memory devices can do this. In that case querycap will return the M2M or M2M_MPLANE capability. The mem2mem_testdev driver is a good example. Other devices shouldn't combine the two. On 09/10/2013 04:10 PM, Ricardo Ribalda Delgado wrote: > Hello! > > I am writing the driver for a device that can work as an input and as > output at the same time. It is used for debugging of the video > pipeline. > > Is it possible to have a vb2 queue that supports capture and out at > the same time? > > After a fast look on the code it seems that the code flow is different > depending of the type. if (V4L2_TYPE_IS_OUTPUT()....) :( A vb2_queue is for one direction only, so for a bidirectional device you need two vb2_queue structs. It's recommended to use the v4l2-mem2mem.h framework for that, as is also used by the mem2mem_testdev driver. > > Also it seems that struct video device has only space for one > vb2_queue, so I cant create a video device with two vbuf2 queues. You can, but not by using the vb2_queue pointer in videodev. It might actually be nice to add better core support for m2m devices. If someone needs a project, then that would be nice. Regards, Hans > So is there any way to have a video device with videobuf2 that > supports caputer and output? > > Thanks! > -- 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
