From: Mauro Carvalho Chehab <mchehab@redhat.com>
To: wk <handygewinnspiel@gmx.de>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: [w_scan PATCH] Add Brazil support on w_scan
Date: Mon, 28 Mar 2011 11:29:45 -0300 [thread overview]
Message-ID: <4D909B59.9040809@redhat.com> (raw)
While w_scan Country table has entries for Brazil, they're currently
not handled.
Brazil uses ISDB-T standard (also called SBTVD) for terrestrial
transmissions. Thanks to the way DVB drivers implement ISDB-T,
DVB API v3 calls are handled as if it were DVB-T, and this works
fine for broadcast TV. However, it uses a 6MHz frequency table
close to the one used in US. However, ISDB-T requires a frequency
shift of 142,857 Hz in order to get the central OFTM carrier.
Cable operators use DVB-C, but as they migrated from a PAL/M 6MHz
frequency table identical to NTSC IRC one, DVB-C channels are also
spaced with 6MHz, and the symbol rate is lower than what's found
with 7/8MHz.
For Satellite, Brazil uses DVB-S/DVB-S2 standards on both C and Ku
bands, but, as I currently don't have a Satellite dish, I couldn't
test if w_scan works for it, but I suspect that no changes are needed
for DVB-S.
This patch adds support for both ISDB-T and DVB-C @6MHz used in
Brazil, and adds a new bit rate of 5.2170 MSymbol/s, found on QAM256
transmissions at some Brazilian cable operators.
While here, fix compilation with kernels 2.6.39 and later, where the
old V4L1 API were removed (so, linux/videodev.h doesn't exist anymore).
This is needed to compile it on Fedora 15 beta.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff -r 1bd9736b45fe w_scan-20110206/countries.c
--- a/w_scan-20110206/countries.c Tue Mar 22 23:19:49 2011 -0300
+++ b/w_scan-20110206/countries.c Mon Mar 28 11:11:28 2011 -0300
@@ -31,7 +31,7 @@
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
-#include <linux/videodev.h>
+#include <linux/videodev2.h>
#include <linux/dvb/frontend.h>
#ifdef VDRVERSNUM
@@ -136,6 +136,20 @@
}
break;
+ case BR: // Brazil
+ switch(*dvb) {
+ case FE_QAM:
+ *frontend_type = FE_QAM;
+ info("DVB cable\n");
+ break;
+ default:
+ *frontend_type = FE_OFDM;
+ info("ISDB-T (SBTVD)\n");
+ break;
+ }
+ break;
+
+
case US: // UNITED STATES
case CA: // CANADA
*frontend_type = FE_ATSC;
@@ -245,6 +259,18 @@
info("QAM US/CA\n");
}
break;
+ case BR:
+ switch(*dvb) {
+ case FE_QAM:
+ *channellist = DVBC_BR;
+ info("Brazil, cable\n");
+ break;
+ default:
+ *channellist = ISDBT_6MHZ;
+ info("Brazil, terrestrial\n");
+ break;
+ }
+ break;
//******************************************************************//
default:
info("Country identifier %s not defined. Using default freq lists.\n", country);
@@ -278,6 +304,23 @@
case 14 ... 69: return 389000000;
default: return SKIP_CHANNEL;
}
+ case ISDBT_6MHZ: // ISDB-T, 6 MHz central frequencies
+ switch (channel) {
+ // Channels 7-13 are reserved but aren't used yet
+ case 14 ... 69: return 389000000 + 142857;
+ default: return SKIP_CHANNEL;
+ }
+ case DVBC_BR: //BRAZIL - same range as ATSC IRC
+ switch (channel) {
+ case 02 ... 04: return 45000000;
+ case 05 ... 06: return 49000000;
+ case 07 ... 13: return 135000000;
+ case 14 ... 22: return 39000000;
+ case 23 ... 94: return 81000000;
+ case 95 ... 99: return -477000000;
+ case 100 ... 133: return 51000000;
+ default: return SKIP_CHANNEL;
+ }
case DVBT_AU: //AUSTRALIA, 7MHz step list
switch (channel) {
case 05 ... 12: return 142500000;
@@ -321,6 +364,8 @@
*/
int freq_step(int channel, int channellist) {
switch (channellist) {
+ case ISDBT_6MHZ:
+ case DVBC_BR:
case ATSC_QAM:
case ATSC_VSB: return 6000000; // atsc, 6MHz step
case DVBT_AU: return 7000000; // dvb-t australia, 7MHz step
diff -r 1bd9736b45fe w_scan-20110206/countries.h
--- a/w_scan-20110206/countries.h Tue Mar 22 23:19:49 2011 -0300
+++ b/w_scan-20110206/countries.h Mon Mar 28 11:11:28 2011 -0300
@@ -43,6 +43,8 @@
DVBC_QAM = 7,
DVBC_FI = 8,
DVBC_FR = 9,
+ DVBC_BR = 10,
+ ISDBT_6MHZ = 11,
USERLIST = 999
};
diff -r 1bd9736b45fe w_scan-20110206/scan.c
--- a/w_scan-20110206/scan.c Tue Mar 22 23:19:49 2011 -0300
+++ b/w_scan-20110206/scan.c Mon Mar 28 11:11:28 2011 -0300
@@ -1914,6 +1914,7 @@
case 14: return 5483000;
case 15: return 6956000;
case 16: return 6956500;
+ case 17: return 5217000; // Used in Brazil DVB-C @ 6MHz Bandwidth
default: return 0;
}
}
@@ -1985,6 +1986,10 @@
dvbc_symbolrate_min=dvbc_symbolrate_max=0;
break;
case FE_QAM:
+ // 6MHz DVB-C uses lower symbol rates
+ if (freq_step(channel, this_channellist) == 6000000) {
+ dvbc_symbolrate_min=dvbc_symbolrate_max=17;
+ }
break;
case FE_QPSK:
// channel means here: transponder,
@@ -2555,7 +2560,7 @@
" enables scan of symbolrates\n"
" 6111, 6250, 6790, 6811, 5900,\n"
" 5000, 3450, 4000, 6950, 7000,\n"
- " 6952, 6956, 6956.5\n"
+ " 6952, 6956, 6956.5, 5.217\n"
" 2 = extended QAM scan (enable QAM128)\n"
" recommended for Nethterlands and Finland\n"
" NOTE: extended scan will be *slow*\n"
@@ -2577,6 +2582,7 @@
" 14 = 5.4830 MSymbol/s\n"
" 15 = 6.9560 MSymbol/s\n"
" 16 = 6.9565 MSymbol/s\n"
+ " 17 = 5.2170 MSymbol/s\n"
" NOTE: for experienced users only!!\n"
".................DVB-S/S2................\n"
" -l <LNB type>\n"
@@ -2657,7 +2663,7 @@
case 'e': //extended scan flags
ext = strtoul(optarg, NULL, 0);
if (ext & 0x01)
- dvbc_symbolrate_max = 16;
+ dvbc_symbolrate_max = 17;
if (ext & 0x02) {
modulation_max = 2;
modulation_flags |= MOD_OVERRIDE_MAX;
next reply other threads:[~2011-03-28 14:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 14:29 Mauro Carvalho Chehab [this message]
2011-03-28 17:20 ` [w_scan PATCH] Add Brazil support on w_scan handygewinnspiel
2011-03-28 18:46 ` Mauro Carvalho Chehab
2011-03-29 20:11 ` handygewinnspiel
2011-03-29 23:21 ` Mauro Carvalho Chehab
2011-03-31 10:45 ` Mauro Carvalho Chehab
2011-03-31 17:15 ` handygewinnspiel
2011-03-31 19:50 ` Mauro Carvalho Chehab
2011-03-31 19:52 ` Mauro Carvalho Chehab
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