I thought someone on this list might be interested in some work I've been doing. Specifically, I have developed a dvbloopback adapter (based on the vloopback adapter: http://www.lavrsen.dk/twiki/bin/view/Motion/VideoFourLinuxLoopbackDevice). It will forward all file I/O requests to a userspace app, which can process the requests however desired. At the moment, the code is still in the debugging stage, and the userspace app will simply forward the requests to a real dvb adapter, but it can also be used for the purpose I originally wrote it for: to test out some userspace driver code, or for monitoring data transmitted between a dvb-app and the kernel without doing a bunch of module hacking. The code works by creating 2 sets of each device (frontend0, frontend1; demux0, demux1, etc) it is expected that the userspace control app will attach to the '1' devices (as they don't speak the DVB-api language). The kernel module takes requests from the '0' device, passes open,close,read,ioctl, and poll (no support for write at the moment) requests on to the '1' device via a defined api, waits for an ioctl response on the '1' device corresponding to the status and/or data from the request, and returns that on the '0' device. I had to play some tricks to get poll to behave nicely, but it seems to work quite well with negligible performance impact for the simple case of forwarding commands to a real adapter. There is still quite a bit of work to do, but I thought I'd make the code available in case there was any interest. so I started a project on GNA! to host the code: http://gna.org/projects/dvbloopback/ (no files, but the code is in the SVN repository) Cheers, Alan _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
