[linux-dvb] [PATCH] scan-s2: fixes and diseqc rotor support

Alex Betis alex.betis at gmail.com
Wed Nov 12 13:59:04 CET 2008


2008/11/12 BOUWSMA Barry <freebeer.bouwsma at gmail.com>

> On Wed, 12 Nov 2008, Alex Betis wrote:
>
> > BTW, you give here example of NIT parsing, do you know the format of the
> > message and what field specifies that the delivery system is DVB-S2? scan
> > utility code doesn't parse it, so I just add both DVB-S and DVB-S2 scans
> for
>
> I've spent yesterday hacking UTF-8 output into my old copy
> of dvb-apps and then finding that the Greek 13E Hotbirds
> channel `Βουλή:12168:h:2:27500:517:700:384' [UTF-8 encoded,
> hope my MIME headers and ESMTP are correct] is not sent as
> latin-greek charset, and thus doesn't appear properly for
> me, but anyway, here is a code snippet of my `scan' that sends
> the NIT dump of the scanned transponder to stderr, that I
> use when needed.  Cut'n'paste; also part of a much larger
> set of hacks, so it's meant as an example, and not to be
> used as ``useful'' code:
>
> +
> +char *fec[10] = {"NONE", "1/2", "2/3", "3/4", "4/5", "5/6", "6/7", "7/8",
> "8/9", "AUTO" } ;
> +if (tn.type == 0) {
> +  if (dump_nits == 1) {
> +    printf("NIT result:  %d %s %d   pos  %.1f%s  ", tn.param.frequency,
> tn.polarisation ? "V" : "H", tn.param.u.qpsk.symbol_rate,
> (float)tn.orbital_pos/10, tn.we_flag ? "E" : "W");
> +    printf("  FEC %s",  fec[tn.param.u.qpsk.fec_inner] );
> +if (tn.modulation & 0x04) {
> +       printf("  DVB-S2");
> +  if ((tn.modulation & 0x03) == 0x01) printf (" QPSK");
> +  if ((tn.modulation & 0x03) == 0x02) printf (" 8PSK");
> +
> +}
> +if (tn.param.inversion != 2)
> +       printf("  inv %s",  tn.param.inversion ? "OFF" : "ON" /*XXX FIXME
> */);
> +printf("\n");
> +  }
> +}
> +

I must be missing something... How this code is aligned to the following
modulation enumeration?
QPSK enumeration has value 0, 8PSK value 9.

typedef enum fe_modulation {
   QPSK,
   QAM_16,
   QAM_32,
   QAM_64,
   QAM_128,
   QAM_256,
   QAM_AUTO,
   VSB_8,
   VSB_16,
   PSK_8,
   APSK_16,
   APSK_32,
   DQPSK,
} fe_modulation_t;

>
>
>
> Also, I believe that the recent `dvbsnoop' invoked with
> `-s ts -tssubdecode' on the NIT PID will verbosely parse
> the components and display everything -- I believe I used
> that source code as the basis for the above hack.
>
> I wonder if any of my other dvb-apps/scan hacks would be
> of interest for someone to clean up (for me, function
> before form, especially when I don't have a clue as to
> what I am doing)...
>
>
> barry bouwsma
>
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