2008/11/12 BOUWSMA Barry <freebeer.bouwsma@xxxxxxxxx>
On Wed, 12 Nov 2008, Alex Betis wrote:> BTW, you give here example of NIT parsing, do you know the format of theI've spent yesterday hacking UTF-8 output into my old copy
> 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
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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