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add snr calculations for CXD1981 frontend
author
Stefan Pluecken
<stefan.pluecken@multimedia-labs.de>
Mon, 5 Jul 2010 14:12:08 +0000
(16:12 +0200)
committer
ghost
<andreas.monzner@multimedia-labs.de>
Wed, 6 Oct 2010 20:32:35 +0000
(22:32 +0200)
lib/dvb/frontend.cpp
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diff --git
a/lib/dvb/frontend.cpp
b/lib/dvb/frontend.cpp
index a1ba8fe59f34cad7ff3e20734c55a7c675a0121e..abbb8d294ab6f2e89d25fda3e8f8e796120a206b 100644
(file)
--- a/
lib/dvb/frontend.cpp
+++ b/
lib/dvb/frontend.cpp
@@
-906,6
+906,19
@@
int eDVBFrontend::readFrontendData(int type)
}
else if (strstr(m_description, "BCM4506") || strstr(m_description, "BCM4505"))
ret = (snr * 100) >> 8;
+ else if (!strcmp(m_description, "CXD1981"))
+ {
+ int mse = (~snr) & 0xFF;
+ switch (parm_u_qam_modulation) {
+ case QAM_16:
+ case QAM_64:
+ case QAM_256: ret = (int)(-950 * log(((double)mse) / 760)); break;
+ case QAM_32:
+ case QAM_128: ret = (int)(-875 * log(((double)mse) / 650)); break;
+
+ default: break;
+ }
+ }
if (type == signalQuality)
{