[linux-dvb] Re: wanting to contribute dvb-t tuning informationbut small problem with scan

["Robert Schlabbach" <robert_s@gmx.net>]

From: "Christoph Burger-Scheidlin" <c.burger-scheidlin@iu-bremen.de>
> In fact I can only see 15 channels. 4 channels are discovered
> twice with slightly different settings in channels.conf, differing
> in the second FEC value.

I'd say this is a bug in the SI parser. ETSI EN 300 468 says that in the
terrestrial_delivery_system_descriptor(), the second FEC bits shall be
'000' for non-hierarchial channel coding (i.e. then the second FEC is not
used). However '000' means FEC 1/2 _if_ it is used. So the SI parser needs
to check whether a broadcast is non-hierarchial and then use "FEC_NONE" as
the second FEC value instead of whatever value the 3 bits assigned to it
would mean.

I.e. the first line below is correct, the second isn't.

> NDR FS
NDS:786000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_NONE:QAM_16:TRANSM
ISSION_MODE_8K:GUARD_INTERVAL_1_4:HIERARCHY_NONE:4129:4130:129
> NDR FS
NDS:786000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_16:TRANSMI
SSION_MODE_8K:GUARD_INTERVAL_1_4:HIERARCHY_NONE:4129:4130:129

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany