Method monitorSignal

src/input/dvb/Frontend.cpp:284–387

	}

	void Frontend::monitorSignal(const bool showStatus) {
#if SIMU
		(void)showStatus;
		_frontendData.setMonitorData(FE_HAS_LOCK, 214, 15, 0, 0);
#else
		fe_status_t status;

		// first read status
		if (::ioctl(_fd_fe, FE_READ_STATUS, &status) == 0) {
			uint16_t strength = 0;
			uint16_t snr = 0;
			uint32_t ber = 0;
			uint32_t ublocks = 0;

#	if FULL_DVB_API_VERSION >= 0x050A
			if (!_oldApiCallStats) {
				struct dtv_property p[3];
				int size = 0;
				#define FILL_PROP(CMD, DATA) { p[size].cmd = CMD; p[size].u.data = DATA; ++size; }

				FILL_PROP(DTV_STAT_SIGNAL_STRENGTH, DTV_UNDEFINED);
				FILL_PROP(DTV_STAT_CNR, DTV_UNDEFINED);
				FILL_PROP(DTV_STAT_ERROR_BLOCK_COUNT, DTV_UNDEFINED);

				#undef FILL_PROP

				struct dtv_properties cmdseq;
				cmdseq.num = size;
				cmdseq.props = p;

				if (ioctl(_fd_fe, FE_GET_PROPERTY, &cmdseq) == -1) {
					PERROR("FE_GET_PROPERTY failed");
				}

				const auto strengthScale = cmdseq.props[0].u.st.stat[0].scale;
				switch (strengthScale) {
					case FE_SCALE_DECIBEL:
						strength = cmdseq.props[0].u.st.stat[0].svalue * 0.0001;
						break;
					case FE_SCALE_RELATIVE:
						strength = cmdseq.props[0].u.st.stat[0].uvalue;
						break;
					case FE_SCALE_NOT_AVAILABLE:
					default:
						_oldApiCallStats = true;
						break;
				}
				const auto cnrScale = cmdseq.props[1].u.st.stat[0].scale;
				switch (cnrScale) {
					case FE_SCALE_DECIBEL:
						snr = cmdseq.props[1].u.st.stat[0].svalue * 0.0001;
						break;
					case FE_SCALE_RELATIVE:
						snr = cmdseq.props[1].u.st.stat[0].uvalue;
						break;
					case FE_SCALE_NOT_AVAILABLE:
					default:
						_oldApiCallStats = true;