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Code Issues Releases Wiki Activity

Improved signal strength and quality handling

This commit is contained in:
Klaus Schmidinger 2011-06-05 16:22:51 +02:00
parent e572cbda47
commit 1afb2cf1c2
1 changed files with 20 additions and 12 deletions
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32
dvbdevice.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: dvbdevice.c 2.40 2011/06/02 13:28:42 kls Exp $
* $Id: dvbdevice.c 2.41 2011/06/05 16:22:51 kls Exp $
*/
#include "dvbdevice.h"
@ -385,6 +385,9 @@ int cDvbTuner::GetSignalStrength(void) const
uint16_t MaxSignal = 0xFFFF; // Let's assume the default is using the entire range.
// Use the subsystemId to identify individual devices in case they need
// special treatment to map their Signal value into the range 0...0xFFFF.
switch (subsystemId) {
case 0x13C21019: MaxSignal = 870; break; // TT-budget S2-3200 (DVB-S/DVB-S2)
}
int s = int(Signal) * 100 / MaxSignal;
if (s > 100)
s = 100;
@ -394,22 +397,24 @@ int cDvbTuner::GetSignalStrength(void) const
return s;
}
#define LOCK_THRESHOLD 10
#define LOCK_THRESHOLD 5 // indicates that all 5 FE_HAS_* flags are set
int cDvbTuner::GetSignalQuality(void) const
{
fe_status_t Status;
if (GetFrontendStatus(Status)) {
if ((Status & FE_HAS_SIGNAL) == 0)
return 0;
if ((Status & FE_HAS_CARRIER) == 0)
return LOCK_THRESHOLD / 4;
if ((Status & FE_HAS_VITERBI) == 0)
return LOCK_THRESHOLD / 3;
if ((Status & FE_HAS_SYNC) == 0)
return LOCK_THRESHOLD / 2;
if ((Status & FE_HAS_LOCK) == 0)
return LOCK_THRESHOLD;
// Actually one would expect these checks to be done from FE_HAS_SIGNAL to FE_HAS_LOCK, but some drivers (like the stb0899) are broken, so FE_HAS_LOCK is the only one that (hopefully) is generally reliable...
if ((Status & FE_HAS_LOCK) == 0) {
if ((Status & FE_HAS_SIGNAL) == 0)
return 0;
if ((Status & FE_HAS_CARRIER) == 0)
return 1;
if ((Status & FE_HAS_VITERBI) == 0)
return 2;
if ((Status & FE_HAS_SYNC) == 0)
return 3;
return 4;
}
bool HasSnr = true;
uint16_t Snr;
while (1) {
@ -452,6 +457,9 @@ int cDvbTuner::GetSignalQuality(void) const
uint16_t MaxSnr = 0xFFFF; // Let's assume the default is using the entire range.
// Use the subsystemId to identify individual devices in case they need
// special treatment to map their Snr value into the range 0...0xFFFF.
switch (subsystemId) {
case 0x13C21019: MaxSnr = 200; break; // TT-budget S2-3200 (DVB-S/DVB-S2)
}
int a = int(Snr) * 100 / MaxSnr;
int b = 100 - (Unc * 10 + (Ber / 256) * 5);
if (b < 0)