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| author | Andreas Monzner <andreas.monzner@multimedia-labs.de> | 2008-08-04 23:22:19 +0000 |
|---|---|---|
| committer | Andreas Monzner <andreas.monzner@multimedia-labs.de> | 2008-08-04 23:22:19 +0000 |
| commit | c746e07fe32dd9cd95c5bddba437d9f2daf69fcf (patch) | |
| tree | 060930c3c70252bb2e79a77beb8658caab1e16a1 | |
| parent | d58968e5ca43995658257b6e89f092c7572cde0a (diff) | |
| download | enigma2-c746e07fe32dd9cd95c5bddba437d9f2daf69fcf.tar.gz enigma2-c746e07fe32dd9cd95c5bddba437d9f2daf69fcf.zip | |
add SNRdB calculation for STV0288 based frontends
| -rw-r--r-- | lib/dvb/frontend.cpp | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/dvb/frontend.cpp b/lib/dvb/frontend.cpp index 255efd08..79c9ad0b 100644 --- a/lib/dvb/frontend.cpp +++ b/lib/dvb/frontend.cpp @@ -656,6 +656,8 @@ void eDVBFrontend::timeout() } } +#define INRANGE(X,Y,Z) (((X<=Y) && (Y<=Z))||((Z<=Y) && (Y<=X)) ? 1 : 0) + int eDVBFrontend::readFrontendData(int type) { switch(type) @@ -712,6 +714,49 @@ int eDVBFrontend::readFrontendData(int type) return (int)(snr_in_db * 100.0); } + else if (strstr(m_description, "Alps BSBE1 C01A") || + !strcmp(m_description, "Alps -S(STV0288)")) + { + if (snr == 0) + return 0; + else if (snr == 0xFFFF) // i think this should not happen + return 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} + }; + long regval = 0xFFFF - ((snr / 3) + 0xA100), // 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])) + { + long val; + while((Imax-Imin)>1) + { + i=(Imax+Imin)/2; + if(INRANGE(CN_lookup[Imin][REGVAL],regval,CN_lookup[i][REGVAL])) + Imax = i; + else + Imin = i; + } + return (((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; + } + return 100; + } + return 0; + } else if (!strcmp(m_description, "Alps BSBE1 702A") || // some frontends with STV0299 !strcmp(m_description, "Alps -S") || !strcmp(m_description, "Philips -S") || |