add frequency possibility test to detect the correct lnb

(for example on tunerA a C-Band LNB is used and on tunerB a ku-Band but for both
tuners the same satellites are configured)

diff --git a/lib/dvb/sec.cpp b/lib/dvb/sec.cpp
index aa00062aa1f1d18f1d59e6f4d60dbc5f0dc13050..4724004322c22bb8b432e8a9d823e1252a9f5770 100644 (file)
--- a/lib/dvb/sec.cpp
+++ b/lib/dvb/sec.cpp
@@ -209,6 +209,60 @@ int eDVBSatelliteEquipmentControl::canTune(const eDVBFrontendParametersSatellite
 //                                     else
 //                                             eDebug("OK .. can tune this transponder satpos is correct :)");
                                }
+                               if (ret)
+                               {
+                                       static int lofs[] = { 3650000, 5150000, 9750000, 10600000 };
+                                       int lof = sat.frequency > lnb_param.m_lof_threshold ?
+                                               lnb_param.m_lof_hi : lnb_param.m_lof_lo;
+                                       int diff = 0x7FFFFFFF;
+                                       unsigned int num_lofs = sizeof(lofs) / sizeof(int);
+                                       int used_band = -1;
+                                       for (int i=0; i < num_lofs; ++i)
+                                       {
+                                               int lof_diff = abs(lof - lofs[i]);
+                                               if ( lof_diff < diff )
+                                               {
+                                                       diff = lof_diff;
+                                                       used_band = i;
+                                               }
+                                       }
+                                       if ( used_band != -1 )
+                                       {
+                                               if ( diff > 50000 )
+                                               {
+                                                       eDebug("could not detect used lnb freq range .. disable range check !!!");
+                                                       used_band = -1;
+                                               }
+                                       }
+                                       if ( used_band != -1 )
+                                       {
+                                               int range[2];
+                                               switch(used_band)
+                                               {
+                                                       case 0:  // s-band
+                                                               range[0] = 2500000;
+                                                               range[1] = 2700000;
+                                                               break;
+                                                       case 1:  // c-band
+                                                               range[0] = 3400000;
+                                                               range[1] = 4200000;
+                                                               break;
+                                                       case 2:  // ku-band low
+                                                               range[0] = 10700000;
+                                                               range[1] = 11750000;
+                                                               break;
+                                                       case 3:  // ku-band high
+                                                               range[0] = 11750000;
+                                                               range[1] = 12750000;
+                                                               break;
+                                               }
+                                               // check frequency in range ( +/- 50Mhz )
+                                               if ( (sat.frequency+75000) < range[0] )
+                                                       ret=0;
+                                               if ( (sat.frequency-75000) > range[1] )
+                                                       ret=0;
+                                       }
+                               }
                        }
                }
        }