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#include "../frontend.h"
#include "../tuner.h"
#include <sys/ioctl.h>
#include <linux/dvb/frontend.h>
#define FREQ_OFFSET_MIN 0
#define FREQ_OFFSET_MAX 4
class Frontend_OFDM : public Frontend {
public:
Frontend_OFDM(Tuner * t, int fd, const struct dvb_frontend_info & i) :
Frontend(t, fd, i, LOGMANAGER()->getLogger<Frontend_OFDM>())
{
}
void TuneTo(const DVBSI::DeliveryPtr & mp) const
{
auto td = DVBSI::TerrestrialDeliveryPtr::dynamicCast(mp);
if (!td) {
throw P2PVR::IncorrectDeliveryType();
}
dvb_frontend_parameters feparams;
memset(&feparams, 0, sizeof(dvb_frontend_parameters));
feparams.frequency = td->Frequency;
feparams.inversion = INVERSION_OFF;
feparams.u.ofdm.bandwidth = (fe_bandwidth)td->Bandwidth;
feparams.u.ofdm.code_rate_HP = (fe_code_rate_t)td->CodeRateHP;
feparams.u.ofdm.code_rate_LP = (fe_code_rate_t)td->CodeRateLP;
feparams.u.ofdm.constellation = (fe_modulation_t)td->Constellation;
feparams.u.ofdm.transmission_mode = (fe_transmit_mode)td->TransmissionMode;
feparams.u.ofdm.guard_interval = (fe_guard_interval_t)td->GuardInterval;
feparams.u.ofdm.hierarchy_information = (fe_hierarchy_t)td->Hierarchy;
SetParameters(feparams);
WaitForLock();
}
dvb_frontend_parameters GetParameters() const
{
dvb_frontend_parameters feparams;
memset(&feparams, 0, sizeof(dvb_frontend_parameters));
if (ioctl(frontendFD, FE_GET_FRONTEND, &feparams) < 0) {
logger->messagebf(LOG::ERR, "Reading frontend parameters failed (%s:%d)", tuner->Device(), strerror(errno), errno);
throw P2PVR::DeviceError(tuner->Device(), strerror(errno), errno);
}
return feparams;
}
void WaitForLock() const
{
fe_status_t status = (fe_status_t)0;
// Wait for something
for (int x = tuner->options->TuningTimeout / 10; x > 0 && (status = GetStatus()) == 0; x -= 1) {
usleep(10000);
}
// Was it useful?
if (!(status & (FE_HAS_SIGNAL | FE_HAS_CARRIER))) {
logger->messagebf(LOG::ERR, "Tuning of device %s failed (No signal or carrier: 0x%02x)", tuner->Device(), status);
throw P2PVR::DeviceError(tuner->Device(), "No carrier", 0);
}
// Wait for lock
for (int x = tuner->options->LockTimeout / 10; x > 0 && ((status = GetStatus()) & FE_HAS_LOCK) == 0; x -= 1) {
usleep(10000);
}
if (!(status & FE_HAS_LOCK)) {
logger->messagebf(LOG::ERR, "Tuning of device %s failed (%s)", tuner->Device(), "No lock");
throw P2PVR::DeviceError(tuner->Device(), "No lock", 0);
}
}
void SetParameters(const dvb_frontend_parameters & feparams) const
{
if (ioctl(frontendFD, FE_SET_FRONTEND, &feparams) < 0) {
logger->messagebf(LOG::ERR, "Tuning of device %s failed (%s:%d)", tuner->Device(), strerror(errno), errno);
throw P2PVR::DeviceError(tuner->Device(), strerror(errno), errno);
}
}
std::string Type() const
{
return "OFDM (DVB-T)";
}
enum Country { DVBT_AU, DVBT_DE, DVBT_FR, DVBT_GB };
static uint32_t FrequencyForCountry(Country country, int channel)
{
switch (country) {
case DVBT_AU: //AUSTRALIA, 7MHz step list
switch (channel) {
case 5 ... 12: return 142500000;
case 21 ... 69: return 333500000;
}
case DVBT_DE: //GERMANY
case DVBT_FR: //FRANCE, +/- offset 166kHz & +offset 332kHz & +offset 498kHz
case DVBT_GB: //UNITED KINGDOM, +/- offset
switch (channel) {
case 5 ... 12: return 142500000; // VHF unused in FRANCE, skip those in offset loop
case 21 ... 69: return 306000000;
}
}
return 0;
}
static uint32_t FrequencyStepForCountry(Country country, int channel)
{
switch (country) {
case DVBT_AU:
return 7000000; // dvb-t australia, 7MHz step
case DVBT_DE:
case DVBT_FR:
case DVBT_GB:
switch (channel) { // dvb-t europe, 7MHz VHF ch5..12, all other 8MHz
case 5 ... 12: return 7000000;
case 21 ... 69: return 8000000;
}
}
return 0;
}
static uint32_t ChannelFrequencyForCountry(Country country, int channel, int)
{
return FrequencyForCountry(country, channel) + (channel * FrequencyStepForCountry(country, channel));
}
void FrequencyScan(const OnFrequencyFound & onFrequencyFound) const
{
struct dvb_frontend_parameters feparams;
memset(&feparams, 0, sizeof(dvb_frontend_parameters));
feparams.inversion = (fe_info.caps & FE_CAN_INVERSION_AUTO ? INVERSION_AUTO : INVERSION_OFF);
feparams.u.ofdm.constellation = (fe_info.caps & FE_CAN_QAM_AUTO ? QAM_AUTO : QAM_64);
feparams.u.ofdm.hierarchy_information = HIERARCHY_NONE;
for (int channel = 0; channel < 134; channel += 1) {
for (uint32_t offset = FREQ_OFFSET_MIN; offset <= 0/*FREQ_OFFSET_MAX*/; offset += 1) {
feparams.frequency = ChannelFrequencyForCountry(DVBT_GB, channel, offset);
if (feparams.frequency == 0) {
continue;
}
if (fe_info.frequency_min > feparams.frequency || fe_info.frequency_max < feparams.frequency) {
logger->messagebf(LOG::WARNING, "Channel %d, freq (%d Hz) outside card range", channel, feparams.frequency);
continue;
}
try {
logger->messagebf(LOG::DEBUG, "Channel %d, Frequency %d Hz", channel, feparams.frequency);
SetParameters(feparams);
WaitForLock();
logger->messagebf(LOG::INFO, "Found multiplex at %d Hz", feparams.frequency);
logger->messagebf(LOG::DEBUG, "frequency %d", feparams.frequency);
if (onFrequencyFound(feparams.frequency)) {
return;
}
}
catch (const P2PVR::DeviceError &) {
// Moving on...
}
}
}
}
};
NAMEDFACTORY(Frontend::FactoryKey(FE_OFDM), Frontend_OFDM, FrontendFactory);
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