+ else if (!strcmp(m_description, "BCM4501 (internal)"))
+ {
+ float SDS_SNRE = snr << 16;
+ float snr_in_db;
+
+ if (parm_u_qpsk_fec_inner <= FEC_AUTO) // DVB-S1 / QPSK
+ {
+ static float SNR_COEFF[6] = {
+ 100.0 / 4194304.0,
+ -7136.0 / 4194304.0,
+ 197418.0 / 4194304.0,
+ -2602183.0 / 4194304.0,
+ 20377212.0 / 4194304.0,
+ -37791203.0 / 4194304.0,
+ };
+ float fval1 = 12.44714 - (2.0 * log10(SDS_SNRE / 256.0)),
+ fval2 = pow(10.0, fval1)-1;
+ fval1 = 10.0 * log10(fval2);
+
+ if (fval1 < 10.0)
+ {
+ fval2 = SNR_COEFF[0];
+ for (int i=1; i<6; ++i)
+ {
+ fval2 *= fval1;
+ fval2 += SNR_COEFF[i];
+ }
+ fval1 = fval2;
+ }
+ snr_in_db = fval1;
+ }
+#if HAVE_DVB_API_VERSION >= 3
+ else
+ {
+ float fval1 = SDS_SNRE / 268435456.0,
+ fval2, fval3, fval4;
+
+ if (parm_u_qpsk_fec_inner <= FEC_S2_QPSK_9_10) // DVB-S2 QPSK
+ {
+ fval2 = 6.76;
+ fval3 = 4.35;
+ }
+ else // 8PSK
+ {
+ fval1 *= 0.5;
+ fval2 = 8.06;
+ fval3 = 6.18;
+ }
+ fval4 = -10.0 * log10(fval1);
+ fval1 = fval4;
+ for (int i=0; i < 5; ++i)
+ fval1 = fval4 - fval2 * log10(1.0+pow(10.0, (fval3-fval1)/fval2));
+ snr_in_db = fval1;
+ }
+#endif
+ sat_max = 1750;
+ ret = (int)(snr_in_db * 100);
+ }
+ else if (strstr(m_description, "Alps BSBE1 C01A") ||
+ !strcmp(m_description, "Alps -S(STV0288)"))
+ {
+ if (snr == 0)
+ ret = 0;
+ else if (snr == 0xFFFF) // i think this should not happen
+ ret = 100*100;
+ else
+ {
+ enum { REALVAL, REGVAL };
+ const long CN_lookup[31][2] = {
+ {20,8900}, {25,8680}, {30,8420}, {35,8217}, {40,7897},
+ {50,7333}, {60,6747}, {70,6162}, {80,5580}, {90,5029},
+ {100,4529}, {110,4080}, {120,3685}, {130,3316}, {140,2982},
+ {150,2688}, {160,2418}, {170,2188}, {180,1982}, {190,1802},
+ {200,1663}, {210,1520}, {220,1400}, {230,1295}, {240,1201},
+ {250,1123}, {260,1058}, {270,1004}, {280,957}, {290,920},
+ {300,890}
+ };
+ int add=strchr(m_description, '.') ? 0xA250 : 0xA100;
+ long regval = 0xFFFF - ((snr / 3) + add), // revert some dvb api calulations to get the real register value
+ Imin=0,
+ Imax=30,
+ i;
+ if(INRANGE(CN_lookup[Imin][REGVAL],regval,CN_lookup[Imax][REGVAL]))
+ {
+ while((Imax-Imin)>1)
+ {
+ i=(Imax+Imin)/2;
+ if(INRANGE(CN_lookup[Imin][REGVAL],regval,CN_lookup[i][REGVAL]))
+ Imax = i;
+ else
+ Imin = i;
+ }
+ ret = (((regval - CN_lookup[Imin][REGVAL])
+ * (CN_lookup[Imax][REALVAL] - CN_lookup[Imin][REALVAL])
+ / (CN_lookup[Imax][REGVAL] - CN_lookup[Imin][REGVAL]))
+ + CN_lookup[Imin][REALVAL]) * 10;
+ }
+ else
+ ret = 100;
+ }
+ }
+ else if (!strcmp(m_description, "Alps BSBE1 702A") || // some frontends with STV0299
+ !strcmp(m_description, "Alps -S") ||
+ !strcmp(m_description, "Philips -S") ||
+ !strcmp(m_description, "LG -S") )
+ {
+ sat_max = 1500;
+ ret = (int)((snr-39075)/17.647);
+ } else if (!strcmp(m_description, "Alps BSBE2"))
+ {
+ ret = (int)((snr >> 7) * 10);
+ } else if (!strcmp(m_description, "Philips CU1216Mk3"))
+ {
+ int mse = (~snr) & 0xFF;
+ switch (parm_u_qam_modulation) {
+ case QAM_16: ret = fe_udiv(1950000, (32 * mse) + 138) + 1000; break;
+ case QAM_32: ret = fe_udiv(2150000, (40 * mse) + 500) + 1350; break;
+ case QAM_64: ret = fe_udiv(2100000, (40 * mse) + 500) + 1250; break;
+ case QAM_128: ret = fe_udiv(1850000, (38 * mse) + 400) + 1380; break;
+ case QAM_256: ret = fe_udiv(1800000, (100 * mse) + 40) + 2030; break;
+ default: break;
+ }
+ } else if (!strcmp(m_description, "Philips TU1216"))
+ {
+ snr = 0xFF - (snr & 0xFF);
+ if (snr != 0)
+ ret = 10 * (int)(-100 * (log10(snr) - log10(255)));
+ }
+
+ if (type == signalQuality)
+ {
+ if (ret == 0x12345678) // no snr db calculation avail.. return untouched snr value..
+ return snr;
+ switch(m_type)
+ {
+ case feSatellite:
+ return ret >= sat_max ? 65536 : ret * 65536 / sat_max;
+ case feCable: // we assume a max of 42db here
+ return ret >= 4200 ? 65536 : ret * 65536 / 4200;
+ case feTerrestrial: // we assume a max of 24db here
+ return ret >= 2400 ? 65536 : ret * 65536 / 2400;
+ }
+ }
+/* else
+ eDebug("no SNR dB calculation for frontendtype %s yet", m_description); */
+ return ret;