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)

1 files changed, 54 insertions, 0 deletions

diff --git a/lib/dvb/sec.cpp b/lib/dvb/sec.cpp
index aa00062a..47240043 100644
--- 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;
+					}
+				}
 			}
 		}
 	}