Le Tuesday 14 October 2008 19:02:03 Darron Broad, vous avez écrit : > In message <200810141451.02941.hftom@xxxxxxx>, Christophe Thommeret wrote: > > LO > > >Le Tuesday 14 October 2008 12:29:49 Darron Broad, vous avez =E9crit=A0: > >> In message <200810141133.36559.hftom@xxxxxxx>, Christophe Thommeret > >> wrote: > >> > >> hi > >> > >> >Hi, > >> > > >> >This patch makes cx24116 to behave like other dvb-s frontends. > >> > >> Unlike most DVB-S cards the those with a cx24116 use S2API > >> this makes them somewhat different. > >> > >> >This is needed especially because QAM_AUTO is used in a lot of scan > >> > file= > > > >s. > > > >> What scan files are you referring to? The > >> cx24116 only does PSK, not AM. QAM_AUTO > >> doesn't sound right. the cx24116 can't > >> auto detect anything, but that's another > >> story... > > > >dvbscan initial tuning data files for DVB-S don't have an entry for=20 > >modulation. So an app like kaffeine simply set modulation to QAM_AUTO. > >Why not QPSK, you ask? Simply because DVB-S standard allows QPSK and > > 16QAM.= > > It doesn't include modulation because QPSK is implied. > > >Maybe there is not a single 16QAM TP all over the world, but it's still > > a=20 valid modulation for DVB-S. > > As is said, the cx24116 only does PSK. > > The driver should return unsupported for anything it can't do. > > If someone out there actually uses 16-QAM (who are you?) and that person > switches to an adapter with a cx24116 they should be informed of error > when tuning 16-QAM, not acceptance of something it doesn't support. > > >So, we set modulation to QAM_AUTO when it's unknown/unspecified, like > > in=20 dvbscan files (those being also used by kaffeine). And it works > > pretty well= ,=20 > >just because most dvb-s can only do QPSK and so force modulation to > > QPSK=20 instead of returning a notsup. > >See this as software QAM_AUTO :) > > > >P.S. > >This is with s2api. > > When you use DVB-S delivery you should set the modulation to QPSK. If > an end-user out there really needs 16-QAM then you should allow them > the option to change it to QAM_16. I do not think this is going > inconvenience many people. Ok, you win :) Other subject: Would you accept some patch to enhance cx24116 pilot_auto emulation? -- Christophe Thommeret _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
