Le Mercredi 04 Octobre 2006 18:08, Steven Toth a écrit : > Hi, > > The WinTV-HVR3000 has a single transport bus on the cx2388x shared > between a cx22702 DVB-T and a cx24123 DVB-S. The windows driver manages > the hardware to ensure an application can stream from one or the other > demod. > > In terms of Linux and the current tree, it's a trivial thing to add > basic DVB-T only support, or it's a trivial thing to add DVB-S only > support - mainly because both of these demod/tuners are already > supported in the tree. Adding dynamic switching between either demod is > an interesting problem. > > On one hand with solution #1 we have the multiproto tree which tries to > address some of these issues (at the frontend ops only, with no > considerations to the implementation within the frameworks). > > On the other hand with solution #2 (for current support modulation > schemes) why don't we simply register multiple frontends during > dvb_register? > > I created a cx88 patch last night to try this and the only questionable > result is that you end up with a solution like this: > > /dev/dvb/adapter0/fe0 .. cx24123 DVB-S on a HVR3000 > /dev/dvb/adapter1/fe0 .. cx22702 DVB-T on the same HVR3000 > /dev/dvb/adapter2/fe0 .. dvico ATSC LG demod I also had installed. > > The simple thing about a solution like this is that: > a. a/t/szap -a <fenum> worked with zero changes. > b. The recent cx88 bus arbitration patches ensured that only one of > adapter0/fe0 or adapter1/fe could be opened at any one time. (As expected). > > I don't see solution #2 as a replacement for solution #1, but the > patches are pretty trivial and localised within a single framework. > > A few consideration: > > How will new or existing applications deal with solution#2? > Do any existing drivers deliver adapter0/fe0 and adapter0/fe1 and which > applications support that? At least, Kaffeine should work with frontend1/dvr1/demux1 (in fact, i've always assumed that a multi tuner adapter would provide multiple frontends/dvr/demux) -- Christophe Thommeret _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
