Hi Ralph, On Thu, Sep 09, 2010 at 11:52:25PM +0200, rjkm wrote: > > cards like the Digital Devices DuoFlex S2, cineS2 and upcoming > hardware (octuple, network, etc.) have independent CA devices. > This means that instead of having the stream routed from the frontend > through the CI and only then into memory a stream can be sent from > memory through the CI and back. So, the current device model does not > fit this hardware. > > One could hide this fact inside the driver and send the stream from > the frontend through the CI transparently to the API but this would > prevent people from implementing new features like decoding a stream from > a different DVB card, decoding streams from hard disk or even decoding > several sub-streams from different transponders. > The latter works with the current Windows driver but I have not > implemented it in Linux yet. It also has to be supported by the CI > modules. Some can decode 12 streams (6 times video/audio) at once. > > But decoding single streams already works fine. Currently, I am > registering a different adapter for the CI. > On a CineS2 with CI attached at the IO port I then have > > /dev/dvb/adapter[01] for the two DVB-S2 frontends and > /dev/dvb/adapter2 just for the ca0 device. > > I am abusing the unused sec0 to write/read data to/from the CI module. > For testing I hacked zap from dvb-apps to tune on adapter0 but > use adapter2/ca0 to talk to the CI module. > I then write the encrypted stream from adapter0/dvr0 into > adapter2/sec0 and read the decoded stream back from adapter2/sec0. > The encrypted stream of course has to contain all the PIDs of the > ca_pmt. > > So, I would like to hear your opinions about how to handle such CA devices > regarding device names/types, the DVB API and user libraries. it looks like there isn't much interest from DVB developers in that topic... I'll try... IMHO there are three sub topics: 1. be compatible with existing applications (I guess this means: feed stream from frontend through CI transparently) 2. create an API which would also work for CI-only devices like this Hauppauge WinTV-CI USB thingy 3. how to switch between these modes? This sec0 device is history (unused and deprecated for years), right? How about the following: Rename it to ci0. When ci0 is closed the stream is routed transparently from frontend through CI, if it's opened one needs to read/write the stream from userspace. If you can't get responses here I guess you could talk to vdr or other application developers. After all they'll have to use the API. Cheers, Johannes -- 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
