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Signal strength and quality (CNR) are now determined via DVB API 5 (if available)

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This commit is contained in:
Klaus Schmidinger 2017-04-06 17:12:59 +02:00
parent 6d52c80273
commit 016e10c1b0
2 changed files with 101 additions and 23 deletions
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4
HISTORY
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@ -8925,7 +8925,7 @@ Video Disk Recorder Revision History
- Now stopping any ongoing recordings before stopping the plugins, to avoid
a crash when stopping VDR while recording.
2017-04-03: Version 2.3.4
2017-04-06: Version 2.3.4
- The functionality of HandleRemoteModifications(), which synchronizes changes to
timers between peer VDR machines, has been moved to timers.[ch] and renamed to
@ -8963,3 +8963,5 @@ Video Disk Recorder Revision History
timers.
- Fixed a deadlock in the SVDRP command PLAY in case there is currently a
recording being replayed.
- Signal strength and quality (CNR) are now determined via DVB API 5 (if available).
Fallback is the old DVB API 3 method.

120
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 4.4 2017/01/09 15:11:39 kls Exp $
* $Id: dvbdevice.c 4.5 2017/04/06 17:02:35 kls Exp $
*/
#include "dvbdevice.h"
@ -557,9 +557,63 @@ bool cDvbTuner::GetFrontendStatus(fe_status_t &Status) const
//#define DEBUG_SIGNALSTRENGTH
//#define DEBUG_SIGNALQUALITY
#define MAXFRONTENDCMDS 16
#define SETCMD(c, d) { Props[CmdSeq.num].cmd = (c);\
Props[CmdSeq.num].u.data = (d);\
if (CmdSeq.num++ > MAXFRONTENDCMDS) {\
esyslog("ERROR: too many tuning commands on frontend %d/%d", adapter, frontend);\
return false;\
}\
}
int dB1000toPercent(int dB1000, int Low, int High)
{
// Convert the given value, which is in 1/1000 dBm, to a percentage in the
// range 0..100. Anything below Low is considered 0%, and anything above
// High counts as 100%.
if (dB1000 < Low)
return 0;
if (dB1000 > High)
return 100;
// return 100 - 100 * (High - dB1000) / (High - Low); // linear conversion
// return 100 - 100 * sqr(dB1000 - High) / sqr(Low - High); // quadratic conversion, see https://www.adriangranados.com/blog/dbm-to-percent-conversion
double v = 10.0 * (dB1000 - High) / (Low - High); // avoids the sqr() function
return 100 - v * v;
}
int cDvbTuner::GetSignalStrength(void) const
{
ClearEventQueue();
// Try DVB API 5:
for (int i = 0; i < 1; i++) { // just a trick to break out with 'continue' ;-)
dtv_property Props[MAXFRONTENDCMDS];
dtv_properties CmdSeq;
memset(&Props, 0, sizeof(Props));
memset(&CmdSeq, 0, sizeof(CmdSeq));
CmdSeq.props = Props;
SETCMD(DTV_STAT_SIGNAL_STRENGTH, 0);
if (ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq) != 0) {
esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
return -1;
}
int Signal = 0;;
if (Props[0].u.st.len > 0) {
switch (Props[0].u.st.stat[0].scale) {
case FE_SCALE_DECIBEL: Signal = dB1000toPercent(Props[0].u.st.stat[0].svalue, -95000, -20000); // TODO use different values for DVB-S, -T, -C?
break;
case FE_SCALE_RELATIVE: Signal = 100 * Props[0].u.st.stat[0].uvalue / 0xFFFF;
break;
default: ;
}
#ifdef DEBUG_SIGNALSTRENGTH
fprintf(stderr, "FE %d/%d: API5 %d %08X %.1f S = %d\n", adapter, frontend, Props[0].u.st.stat[0].scale, int(Props[0].u.st.stat[0].svalue), int(Props[0].u.st.stat[0].svalue) / 1000.0, Signal);
#endif
}
else
continue;
return Signal;
}
// Fall back to DVB API 3:
uint16_t Signal;
while (1) {
if (ioctl(fd_frontend, FE_READ_SIGNAL_STRENGTH, &Signal) != -1)
@ -579,7 +633,7 @@ int cDvbTuner::GetSignalStrength(void) const
if (s > 100)
s = 100;
#ifdef DEBUG_SIGNALSTRENGTH
fprintf(stderr, "FE %d/%d: %08X S = %04X %04X %3d%%\n", adapter, frontend, subsystemId, MaxSignal, Signal, s);
fprintf(stderr, "FE %d/%d: API3 %08X S = %04X %04X %3d%%\n", adapter, frontend, subsystemId, MaxSignal, Signal, s);
#endif
return s;
}
@ -588,6 +642,36 @@ int cDvbTuner::GetSignalStrength(void) const
int cDvbTuner::GetSignalQuality(void) const
{
// Try DVB API 5:
for (int i = 0; i < 1; i++) { // just a trick to break out with 'continue' ;-)
dtv_property Props[MAXFRONTENDCMDS];
dtv_properties CmdSeq;
memset(&Props, 0, sizeof(Props));
memset(&CmdSeq, 0, sizeof(CmdSeq));
CmdSeq.props = Props;
SETCMD(DTV_STAT_CNR, 0);
if (ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq) != 0) {
esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
return -1;
}
int Cnr = 0;;
if (Props[0].u.st.len > 0) {
switch (Props[0].u.st.stat[0].scale) {
case FE_SCALE_DECIBEL: Cnr = dB1000toPercent(Props[0].u.st.stat[0].svalue, 5000, 20000); // TODO use different values for DVB-S, -T, -C?
break;
case FE_SCALE_RELATIVE: Cnr = 100 * Props[0].u.st.stat[0].uvalue / 0xFFFF;
break;
default: ;
}
#ifdef DEBUG_SIGNALQUALITY
fprintf(stderr, "FE %d/%d: API5 %d %08X %.1f Q = %d\n", adapter, frontend, Props[0].u.st.stat[0].scale, int(Props[0].u.st.stat[0].svalue), int(Props[0].u.st.stat[0].svalue) / 1000.0, Cnr);
#endif
}
else
continue;
return Cnr;
}
// Fall back to DVB API 3:
fe_status_t Status;
if (GetFrontendStatus(Status)) {
// 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...
@ -673,7 +757,7 @@ int cDvbTuner::GetSignalQuality(void) const
if (q > 100)
q = 100;
#ifdef DEBUG_SIGNALQUALITY
fprintf(stderr, "FE %d/%d: %08X Q = %04X %04X %d %5d %5d %3d%%\n", adapter, frontend, subsystemId, MaxSnr, Snr, HasSnr, HasBer ? int(Ber) : -1, HasUnc ? int(Unc) : -1, q);
fprintf(stderr, "FE %d/%d: API3 %08X Q = %04X %04X %d %5d %5d %3d%%\n", adapter, frontend, subsystemId, MaxSnr, Snr, HasSnr, HasBer ? int(Ber) : -1, HasUnc ? int(Unc) : -1, q);
#endif
return q;
}
@ -777,19 +861,11 @@ static int GetRequiredDeliverySystem(const cChannel *Channel, const cDvbTranspon
bool cDvbTuner::SetFrontend(void)
{
#define MAXFRONTENDCMDS 16
#define SETCMD(c, d) { Frontend[CmdSeq.num].cmd = (c);\
Frontend[CmdSeq.num].u.data = (d);\
if (CmdSeq.num++ > MAXFRONTENDCMDS) {\
esyslog("ERROR: too many tuning commands on frontend %d/%d", adapter, frontend);\
return false;\
}\
}
dtv_property Frontend[MAXFRONTENDCMDS];
memset(&Frontend, 0, sizeof(Frontend));
dtv_property Props[MAXFRONTENDCMDS];
memset(&Props, 0, sizeof(Props));
dtv_properties CmdSeq;
memset(&CmdSeq, 0, sizeof(CmdSeq));
CmdSeq.props = Frontend;
CmdSeq.props = Props;
SETCMD(DTV_CLEAR, 0);
if (ioctl(fd_frontend, FE_SET_PROPERTY, &CmdSeq) < 0) {
esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
@ -1263,36 +1339,36 @@ bool cDvbDevice::QueryDeliverySystems(int fd_frontend)
LOG_ERROR;
return false;
}
dtv_property Frontend[1];
dtv_property Props[1];
dtv_properties CmdSeq;
// Determine the version of the running DVB API:
if (!DvbApiVersion) {
memset(&Frontend, 0, sizeof(Frontend));
memset(&Props, 0, sizeof(Props));
memset(&CmdSeq, 0, sizeof(CmdSeq));
CmdSeq.props = Frontend;
CmdSeq.props = Props;
SETCMD(DTV_API_VERSION, 0);
if (ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq) != 0) {
LOG_ERROR;
return false;
}
DvbApiVersion = Frontend[0].u.data;
DvbApiVersion = Props[0].u.data;
isyslog("DVB API version is 0x%04X (VDR was built with 0x%04X)", DvbApiVersion, DVBAPIVERSION);
}
// Determine the types of delivery systems this device provides:
bool LegacyMode = true;
if (DvbApiVersion >= 0x0505) {
memset(&Frontend, 0, sizeof(Frontend));
memset(&Props, 0, sizeof(Props));
memset(&CmdSeq, 0, sizeof(CmdSeq));
CmdSeq.props = Frontend;
CmdSeq.props = Props;
SETCMD(DTV_ENUM_DELSYS, 0);
int Result = ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq);
if (Result == 0) {
for (uint i = 0; i < Frontend[0].u.buffer.len; i++) {
for (uint i = 0; i < Props[0].u.buffer.len; i++) {
if (numDeliverySystems >= MAXDELIVERYSYSTEMS) {
esyslog("ERROR: too many delivery systems on frontend %d/%d", adapter, frontend);
break;
}
deliverySystems[numDeliverySystems++] = Frontend[0].u.buffer.data[i];
deliverySystems[numDeliverySystems++] = Props[0].u.buffer.data[i];
}
LegacyMode = false;
}