DVB-S2: Add option to override ROLLOFF setting

Some DVB drivers do not work properly with ROLLOFF_AUTO and fail to tune when requested.
By allowing to override the default setting tuning to these DVB-S2 channels does work.
According to /usr/include/linux/dvb/frontend.h (DVBAPI version 5 and above) the default
value for ROLLOFF is ROLLOFF_35 iso ROLLOFF_AUTO.

- ROLLOFF_35 is now default when -R <35|20|25|0=auto> option is not given

dvb.c

@@ -530,6 +530,18 @@ static fe_code_rate_t GetFECInner(fe_caps_t fe_caps)
     exit(1);
 }
 
+static fe_rolloff_t GetRollOff(int rolloff)
+{
+    switch( rolloff )
+    {
+        case 0:  return ROLLOFF_AUTO;
+        case 20: return ROLLOFF_20;
+        case 25: return ROLLOFF_25;
+        default:
+        case 35: return ROLLOFF_35;
+    }
+}
+
 /*****************************************************************************
  * FrontendInfo : Print frontend info
  *****************************************************************************/
@@ -663,6 +675,7 @@ static struct dtv_properties dvbt_cmdseq = {
 #define SYMBOL_RATE 3
 #define BANDWIDTH 3
 #define FEC_INNER 4
+#define ROLLOFF 7
 
 static void FrontendSet( void )
 {
@@ -708,6 +721,7 @@ static void FrontendSet( void )
         {
             p = &dvbs2_cmdseq;
             p->props[MODULATION].u.data = GetModulation();
+            p->props[ROLLOFF].u.data = GetRollOff(i_rolloff);
         }
         else
             p = &dvbs_cmdseq;
@@ -716,8 +730,8 @@ static void FrontendSet( void )
         p->props[FEC_INNER].u.data = GetFECInner(info.caps);
         p->props[FREQUENCY].u.data = FrontendDoDiseqc();
 
-        msg_Dbg( NULL, "tuning QPSK frontend to f=%d srate=%d fec=%d modulation=%s",
-                 i_frequency, i_srate, i_fec,
+        msg_Dbg( NULL, "tuning QPSK frontend to f=%d srate=%d fec=%d rolloff=%d modulation=%s",
+                 i_frequency, i_srate, i_fec, i_rolloff,
                  psz_modulation == NULL ? "legacy" : psz_modulation );
         break;
 
@@ -854,6 +868,7 @@ uint8_t dvb_FrontendStatus( uint8_t *p_answer, ssize_t *pi_size )
         msg_Err( NULL, "ioctl FE_GET_INFO failed (%s)", strerror(errno) );
         return RET_ERR;
     }
+
     if ( ioctl( i_frontend, FE_READ_STATUS, &p_ret->i_status ) < 0 )
     {
         msg_Err( NULL, "ioctl FE_READ_STATUS failed (%s)", strerror(errno) );

dvblast.c

@@ -54,6 +54,7 @@ int i_fenum = 0;
 int i_frequency = 0;
 int i_srate = 27500000;
 int i_fec = 999;
+int i_rolloff = 35;
 int i_satnum = 0;
 int i_voltage = 13;
 int b_tone = 0;
@@ -313,7 +314,7 @@ static void DisplayVersion()
  *****************************************************************************/
 void usage()
 {
-    msg_Raw( NULL, "Usage: dvblast [-q] [-c <config file>] [-r <remote socket>] [-t <ttl>] [-o <SSRC IP>] [-i <RT priority>] [-a <adapter>] [-n <frontend number>] [-S <diseqc>] [-f <frequency>|-D <src mcast>:<port>|-A <ASI adapter>] [-F <fec inner>] [-s <symbol rate>] [-v <0|13|18>] [-p] [-b <bandwidth>] [-m <modulation] [-u] [-W] [-U] [-d <dest IP:port>] [-e] [-T]" );
+    msg_Raw( NULL, "Usage: dvblast [-q] [-c <config file>] [-r <remote socket>] [-t <ttl>] [-o <SSRC IP>] [-i <RT priority>] [-a <adapter>] [-n <frontend number>] [-S <diseqc>] [-f <frequency>|-D <src mcast>:<port>|-A <ASI adapter>] [-F <fec inner>] [-R <rolloff>] [-s <symbol rate>] [-v <0|13|18>] [-p] [-b <bandwidth>] [-m <modulation] [-u] [-W] [-U] [-d <dest IP:port>] [-e] [-T]" );
 
     msg_Raw( NULL, "Input:" );
     msg_Raw( NULL, "  -a --adapter <adapter>" );
@@ -330,6 +331,8 @@ void usage()
     msg_Raw( NULL, "    DVB-S2 qpsk|psk_8 (default legacy DVB-S)" );
     msg_Raw( NULL, "  -n --frontend-number <frontend number>" );
     msg_Raw( NULL, "  -p --force-pulse      force 22kHz pulses for high-band selection (DVB-S)" );
+    msg_Raw( NULL, "  -R --rolloff          DVB-S2 Rolloff value" );
+    msg_Raw( NULL, "    DVB-S2 35=0.35|25=0.25|20=0.20|0=AUTO (default: 35)" );
     msg_Raw( NULL, "  -s --symbole-rate" );
     msg_Raw( NULL, "  -S --diseqc           satellite number for diseqc (0: no diseqc, 1-4, A or B)" );
     msg_Raw( NULL, "  -T --unique-ts-id     generate unique TS ID for each program" );
@@ -375,6 +378,7 @@ int main( int i_argc, char **pp_argv )
         { "frontend-number", required_argument, NULL, 'n' },
         { "frequency",       required_argument, NULL, 'f' },
         { "fec-inner",       required_argument, NULL, 'F' },
+        { "rolloff",         required_argument, NULL, 'R' },
         { "symbol-rate",     required_argument, NULL, 's' },
         { "diseqc",          required_argument, NULL, 'S' },
         { "voltage",         required_argument, NULL, 'v' },
@@ -394,7 +398,7 @@ int main( int i_argc, char **pp_argv )
         { 0, 0, 0, 0}
     }; 
 
-    while ( ( c = getopt_long(i_argc, pp_argv, "q::c:r:t:o:i:a:n:f:F:s:S:v:pb:m:uWUTd:D:A:ehV", long_options, NULL)) != -1 )
+    while ( ( c = getopt_long(i_argc, pp_argv, "q::c:r:t:o:i:a:n:f:F:R:s:S:v:pb:m:uWUTd:D:A:ehV", long_options, NULL)) != -1 )
     {
         switch ( c )
         {
@@ -473,6 +477,10 @@ int main( int i_argc, char **pp_argv )
             i_fec = strtol( optarg, NULL, 0 );
             break;
 
+        case 'R':
+            i_rolloff = strtol( optarg, NULL, 0 );
+            break;
+
         case 's':
             i_srate = strtol( optarg, NULL, 0 );
             break;

dvblast.h

@@ -113,6 +113,7 @@ extern int i_frequency;
 extern int i_srate;
 extern int i_satnum;
 extern int i_fec;
+extern int i_rolloff;
 extern int i_voltage;
 extern int b_tone;
 extern int i_bandwidth;