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nit.c
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nit.c
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/*
* nit.c: NIT section filter
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: nit.c 5.2 2021/12/14 21:15:02 kls Exp $
*/
#include "nit.h"
#include <linux/dvb/frontend.h>
#include "channels.h"
#include "dvbdevice.h"
#include "eitscan.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
#include "tools.h"
#define DVB_SYSTEM_1 0 // see also dvbdevice.c
#define DVB_SYSTEM_2 1
#define MAXNETWORKNAME Utf8BufSize(256)
// Set to 'true' for debug output:
static bool DebugNit = false;
#define dbgnit(a...) if (DebugNit) fprintf(stderr, a)
cNitFilter::cNitFilter(cSdtFilter *SdtFilter)
{
sdtFilter = SdtFilter;
Set(0x10, SI::TableIdNIT);
}
void cNitFilter::SetStatus(bool On)
{
cFilter::SetStatus(On);
sectionSyncer.Reset();
}
void cNitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
{
SI::NIT nit(Data, false);
if (!nit.CheckCRCAndParse())
return;
if (!sectionSyncer.Check(nit.getVersionNumber(), nit.getSectionNumber()))
return;
if (DebugNit) {
char NetworkName[MAXNETWORKNAME] = "";
SI::Descriptor *d;
for (SI::Loop::Iterator it; (d = nit.commonDescriptors.getNext(it)); ) {
switch (d->getDescriptorTag()) {
case SI::NetworkNameDescriptorTag: {
SI::NetworkNameDescriptor *nnd = (SI::NetworkNameDescriptor *)d;
nnd->name.getText(NetworkName, MAXNETWORKNAME);
}
break;
default: ;
}
delete d;
}
dbgnit("NIT: %02X %2d %2d %2d %s %d %d '%s'\n", Tid, nit.getVersionNumber(), nit.getSectionNumber(), nit.getLastSectionNumber(), *cSource::ToString(Source()), nit.getNetworkId(), Transponder(), NetworkName);
}
cStateKey StateKey;
cChannels *Channels = cChannels::GetChannelsWrite(StateKey, 10);
if (!Channels)
return;
bool ChannelsModified = false;
SI::NIT::TransportStream ts;
for (SI::Loop::Iterator it; nit.transportStreamLoop.getNext(ts, it); ) {
SI::Descriptor *d;
SI::Loop::Iterator it2;
SI::FrequencyListDescriptor *fld = (SI::FrequencyListDescriptor *)ts.transportStreamDescriptors.getNext(it2, SI::FrequencyListDescriptorTag);
int NumFrequencies = fld ? fld->frequencies.getCount() + 1 : 1;
int Frequencies[NumFrequencies];
if (fld) {
int ct = fld->getCodingType();
if (ct > 0) {
int n = 1;
for (SI::Loop::Iterator it3; fld->frequencies.hasNext(it3); ) {
int f = fld->frequencies.getNext(it3);
switch (ct) {
case 1: f = BCD2INT(f) / 100; break;
case 2: f = BCD2INT(f) / 10; break;
case 3: f = f * 10; break;
default: ;
}
Frequencies[n++] = f;
dbgnit(" Frequencies[%d] = %d\n", n - 1, f);
}
}
else
NumFrequencies = 1;
}
delete fld;
// Necessary for "backwards compatibility mode" according to ETSI EN 300 468:
bool ForceDVBS2 = false;
for (SI::Loop::Iterator it2; (d = ts.transportStreamDescriptors.getNext(it2)); ) {
if (d->getDescriptorTag() == SI::S2SatelliteDeliverySystemDescriptorTag) {
ForceDVBS2 = true;
delete d;
break;
}
delete d;
}
for (SI::Loop::Iterator it2; (d = ts.transportStreamDescriptors.getNext(it2)); ) {
switch (d->getDescriptorTag()) {
case SI::SatelliteDeliverySystemDescriptorTag: {
SI::SatelliteDeliverySystemDescriptor *sd = (SI::SatelliteDeliverySystemDescriptor *)d;
cDvbTransponderParameters dtp;
int Source = cSource::FromData(cSource::stSat, BCD2INT(sd->getOrbitalPosition()), sd->getWestEastFlag());
int Frequency = Frequencies[0] = BCD2INT(sd->getFrequency()) / 100;
static char Polarizations[] = { 'H', 'V', 'L', 'R' };
dtp.SetPolarization(Polarizations[sd->getPolarization()]);
static int CodeRates[] = { FEC_NONE, FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8, FEC_8_9, FEC_3_5, FEC_4_5, FEC_9_10, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_NONE };
dtp.SetCoderateH(CodeRates[sd->getFecInner()]);
static int Modulations[] = { QAM_AUTO, QPSK, PSK_8, QAM_16 };
dtp.SetModulation(Modulations[sd->getModulationType()]);
bool System = sd->getModulationSystem() || ForceDVBS2;
dtp.SetSystem(System ? DVB_SYSTEM_2 : DVB_SYSTEM_1);
static int RollOffs[] = { ROLLOFF_35, ROLLOFF_25, ROLLOFF_20, ROLLOFF_AUTO };
dtp.SetRollOff(System ? RollOffs[sd->getRollOff()] : ROLLOFF_AUTO);
int SymbolRate = BCD2INT(sd->getSymbolRate()) / 10;
dbgnit(" %s %d %c %d %d DVB-S%d\n", *cSource::ToString(Source), Frequency, dtp.Polarization(), SymbolRate, cChannel::Transponder(Frequency, dtp.Polarization()), System ? 2 : 1);
if (Setup.UpdateChannels >= 5) {
bool found = false;
bool forceTransponderUpdate = false;
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
// Preserve parameters set separately in S2SatelliteDeliverySystemDescriptor:
cDvbTransponderParameters dtpc(Channel->Parameters());
dtp.SetStreamId(dtpc.StreamId());
//
int transponder = Channel->Transponder();
if (!ISTRANSPONDER(cChannel::Transponder(Frequency, dtp.Polarization()), transponder)) {
for (int n = 0; n < NumFrequencies; n++) {
if (ISTRANSPONDER(cChannel::Transponder(Frequencies[n], dtp.Polarization()), transponder)) {
Frequency = Frequencies[n];
break;
}
}
}
if (!ISTRANSPONDER(cChannel::Transponder(Frequency, dtp.Polarization()), transponder))
continue; // a channel with obsolete/wrong/other(?) transponder
found = true;
if (ISTRANSPONDER(transponder, Transponder())) // only modify channels if we're actually receiving this transponder
ChannelsModified |= Channel->SetTransponderData(Source, Frequency, SymbolRate, dtp.ToString('S'));
else if (Channel->Srate() != SymbolRate || strcmp(Channel->Parameters(), dtp.ToString('S')))
forceTransponderUpdate = true; // get us receiving this transponder
}
}
if (!found || forceTransponderUpdate) {
for (int n = 0; n < NumFrequencies; n++) {
cChannel *Channel = new cChannel;
Channel->SetId(NULL, ts.getOriginalNetworkId(), ts.getTransportStreamId(), 0, 0);
if (Channel->SetTransponderData(Source, Frequencies[n], SymbolRate, dtp.ToString('S')))
EITScanner.AddTransponder(Channel);
else
delete Channel;
}
}
}
}
break;
case SI::S2SatelliteDeliverySystemDescriptorTag: {
if (Setup.UpdateChannels >= 5) {
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
if (!Channel->GroupSep() && cSource::IsSat(Channel->Source()) && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
SI::S2SatelliteDeliverySystemDescriptor *sd = (SI::S2SatelliteDeliverySystemDescriptor *)d;
cDvbTransponderParameters dtp(Channel->Parameters());
dtp.SetStreamId(sd->getInputStreamIdentifier());
dbgnit(" stream id = %d\n", dtp.StreamId());
ChannelsModified |= Channel->SetTransponderData(Channel->Source(), Channel->Frequency(), Channel->Srate(), dtp.ToString('S'));
break;
}
}
}
}
break;
case SI::CableDeliverySystemDescriptorTag: {
SI::CableDeliverySystemDescriptor *sd = (SI::CableDeliverySystemDescriptor *)d;
cDvbTransponderParameters dtp;
int Source = cSource::FromData(cSource::stCable);
int Frequency = Frequencies[0] = BCD2INT(sd->getFrequency()) / 10;
//XXX FEC_outer???
static int CodeRates[] = { FEC_NONE, FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8, FEC_8_9, FEC_3_5, FEC_4_5, FEC_9_10, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_AUTO, FEC_NONE };
dtp.SetCoderateH(CodeRates[sd->getFecInner()]);
static int Modulations[] = { QPSK, QAM_16, QAM_32, QAM_64, QAM_128, QAM_256, QAM_AUTO };
dtp.SetModulation(Modulations[min(sd->getModulation(), 6)]);
int SymbolRate = BCD2INT(sd->getSymbolRate()) / 10;
dbgnit(" %s %d %d %d %d\n", *cSource::ToString(Source), Frequency, dtp.CoderateH(), dtp.Modulation(), SymbolRate);
if (Setup.UpdateChannels >= 5) {
bool found = false;
bool forceTransponderUpdate = false;
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
int transponder = Channel->Transponder();
if (!ISTRANSPONDER(Frequency / 1000, transponder)) {
for (int n = 0; n < NumFrequencies; n++) {
if (ISTRANSPONDER(Frequencies[n] / 1000, transponder)) {
Frequency = Frequencies[n];
break;
}
}
}
if (!ISTRANSPONDER(Frequency / 1000, transponder))
continue; // a channel with obsolete/wrong/other(?) transponder
found = true;
if (ISTRANSPONDER(transponder, Transponder())) // only modify channels if we're actually receiving this transponder
ChannelsModified |= Channel->SetTransponderData(Source, Frequency, SymbolRate, dtp.ToString('C'));
else if (Channel->Srate() != SymbolRate || strcmp(Channel->Parameters(), dtp.ToString('C')))
forceTransponderUpdate = true; // get us receiving this transponder
}
}
if (!found || forceTransponderUpdate) {
for (int n = 0; n < NumFrequencies; n++) {
cChannel *Channel = new cChannel;
Channel->SetId(NULL, ts.getOriginalNetworkId(), ts.getTransportStreamId(), 0, 0);
if (Channel->SetTransponderData(Source, Frequencies[n], SymbolRate, dtp.ToString('C')))
EITScanner.AddTransponder(Channel);
else
delete Channel;
}
}
}
}
break;
case SI::TerrestrialDeliverySystemDescriptorTag: {
SI::TerrestrialDeliverySystemDescriptor *sd = (SI::TerrestrialDeliverySystemDescriptor *)d;
cDvbTransponderParameters dtp;
int Source = cSource::FromData(cSource::stTerr);
int Frequency = Frequencies[0] = sd->getFrequency() * 10;
static int Bandwidths[] = { 8000000, 7000000, 6000000, 5000000, 0, 0, 0, 0 };
dtp.SetBandwidth(Bandwidths[sd->getBandwidth()]);
static int Constellations[] = { QPSK, QAM_16, QAM_64, QAM_AUTO };
dtp.SetModulation(Constellations[sd->getConstellation()]);
dtp.SetSystem(DVB_SYSTEM_1);
static int Hierarchies[] = { HIERARCHY_NONE, HIERARCHY_1, HIERARCHY_2, HIERARCHY_4, HIERARCHY_AUTO, HIERARCHY_AUTO, HIERARCHY_AUTO, HIERARCHY_AUTO };
dtp.SetHierarchy(Hierarchies[sd->getHierarchy()]);
static int CodeRates[] = { FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8, FEC_AUTO, FEC_AUTO, FEC_AUTO };
dtp.SetCoderateH(CodeRates[sd->getCodeRateHP()]);
dtp.SetCoderateL(CodeRates[sd->getCodeRateLP()]);
static int GuardIntervals[] = { GUARD_INTERVAL_1_32, GUARD_INTERVAL_1_16, GUARD_INTERVAL_1_8, GUARD_INTERVAL_1_4 };
dtp.SetGuard(GuardIntervals[sd->getGuardInterval()]);
static int TransmissionModes[] = { TRANSMISSION_MODE_2K, TRANSMISSION_MODE_8K, TRANSMISSION_MODE_4K, TRANSMISSION_MODE_AUTO };
dtp.SetTransmission(TransmissionModes[sd->getTransmissionMode()]);
dbgnit(" %s %d %d %d %d %d %d %d %d\n", *cSource::ToString(Source), Frequency, dtp.Bandwidth(), dtp.Modulation(), dtp.Hierarchy(), dtp.CoderateH(), dtp.CoderateL(), dtp.Guard(), dtp.Transmission());
if (Setup.UpdateChannels >= 5) {
bool found = false;
bool forceTransponderUpdate = false;
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
// Preserve parameters set separately in T2DeliverySystemDescripto:
cDvbTransponderParameters dtpc(Channel->Parameters());
dtp.SetSystem(dtpc.System());
dtp.SetStreamId(dtpc.StreamId());
dtp.SetT2SystemId(dtp.T2SystemId());
dtp.SetSisoMiso(dtpc.SisoMiso());
dtp.SetBandwidth(dtpc.Bandwidth());
dtp.SetGuard(dtpc.Guard());
dtp.SetTransmission(dtpc.Transmission());
//
int transponder = Channel->Transponder();
if (!ISTRANSPONDER(Frequency / 1000000, transponder)) {
for (int n = 0; n < NumFrequencies; n++) {
if (ISTRANSPONDER(Frequencies[n] / 1000000, transponder)) {
Frequency = Frequencies[n];
break;
}
}
}
if (!ISTRANSPONDER(Frequency / 1000000, transponder))
continue; // a channel with obsolete/wrong/other(?) transponder
found = true;
if (ISTRANSPONDER(transponder, Transponder())) // only modify channels if we're actually receiving this transponder
ChannelsModified |= Channel->SetTransponderData(Source, Frequency, 0, dtp.ToString('T'));
else if (strcmp(Channel->Parameters(), dtp.ToString('T')))
forceTransponderUpdate = true; // get us receiving this transponder
}
}
if (!found || forceTransponderUpdate) {
for (int n = 0; n < NumFrequencies; n++) {
cChannel *Channel = new cChannel;
Channel->SetId(NULL, ts.getOriginalNetworkId(), ts.getTransportStreamId(), 0, 0);
if (Channel->SetTransponderData(Source, Frequencies[n], 0, dtp.ToString('T')))
EITScanner.AddTransponder(Channel);
else
delete Channel;
}
}
}
}
break;
case SI::ExtensionDescriptorTag: {
SI::ExtensionDescriptor *sd = (SI::ExtensionDescriptor *)d;
switch (sd->getExtensionDescriptorTag()) {
case SI::T2DeliverySystemDescriptorTag: {
if (Setup.UpdateChannels >= 5) {
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
int Source = cSource::FromData(cSource::stTerr);
if (!Channel->GroupSep() && Channel->Source() == Source && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
SI::T2DeliverySystemDescriptor *td = (SI::T2DeliverySystemDescriptor *)d;
int Frequency = Channel->Frequency();
int SymbolRate = Channel->Srate();
cDvbTransponderParameters dtp(Channel->Parameters());
dtp.SetSystem(DVB_SYSTEM_2);
dtp.SetStreamId(td->getPlpId());
dtp.SetT2SystemId(td->getT2SystemId());
if (td->getExtendedDataFlag()) {
dtp.SetSisoMiso(td->getSisoMiso());
static int T2Bandwidths[] = { 8000000, 7000000, 6000000, 5000000, 10000000, 1712000, 0, 0 };
dtp.SetBandwidth(T2Bandwidths[td->getBandwidth()]);
static int T2GuardIntervals[] = { GUARD_INTERVAL_1_32, GUARD_INTERVAL_1_16, GUARD_INTERVAL_1_8, GUARD_INTERVAL_1_4, GUARD_INTERVAL_1_128, GUARD_INTERVAL_19_128, GUARD_INTERVAL_19_256, 0 };
dtp.SetGuard(T2GuardIntervals[td->getGuardInterval()]);
static int T2TransmissionModes[] = { TRANSMISSION_MODE_2K, TRANSMISSION_MODE_8K, TRANSMISSION_MODE_4K, TRANSMISSION_MODE_1K, TRANSMISSION_MODE_16K, TRANSMISSION_MODE_32K, TRANSMISSION_MODE_AUTO, TRANSMISSION_MODE_AUTO };
dtp.SetTransmission(T2TransmissionModes[td->getTransmissionMode()]);
//TODO add parsing of frequencies
}
dbgnit(" stream id = %d\n", dtp.StreamId());
ChannelsModified |= Channel->SetTransponderData(Source, Frequency, SymbolRate, dtp.ToString('T'));
}
}
}
}
break;
default: ;
}
}
break;
case SI::LogicalChannelDescriptorTag:
if (Setup.StandardCompliance == STANDARD_NORDIG) {
SI::LogicalChannelDescriptor *lcd = (SI::LogicalChannelDescriptor *)d;
SI::LogicalChannelDescriptor::LogicalChannel LogicalChannel;
for (SI::Loop::Iterator it4; lcd->logicalChannelLoop.getNext(LogicalChannel, it4); ) {
if (LogicalChannel.getVisibleServiceFlag()) {
int lcn = LogicalChannel.getLogicalChannelNumber();
int sid = LogicalChannel.getServiceId();
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
if (!Channel->GroupSep() && Channel->Sid() == sid && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
ChannelsModified |= Channel->SetLcn(lcn);
break;
}
}
}
}
}
break;
case SI::HdSimulcastLogicalChannelDescriptorTag:
if (Setup.StandardCompliance == STANDARD_NORDIG) {
SI::HdSimulcastLogicalChannelDescriptor *lcd = (SI::HdSimulcastLogicalChannelDescriptor *)d;
SI::HdSimulcastLogicalChannelDescriptor::HdSimulcastLogicalChannel HdSimulcastLogicalChannel;
for (SI::Loop::Iterator it4; lcd->hdSimulcastLogicalChannelLoop.getNext(HdSimulcastLogicalChannel, it4); ) {
if (HdSimulcastLogicalChannel.getVisibleServiceFlag()) {
int lcn = HdSimulcastLogicalChannel.getLogicalChannelNumber();
int sid = HdSimulcastLogicalChannel.getServiceId();
for (cChannel *Channel = Channels->First(); Channel; Channel = Channels->Next(Channel)) {
if (!Channel->GroupSep() && Channel->Sid() == sid && Channel->Nid() == ts.getOriginalNetworkId() && Channel->Tid() == ts.getTransportStreamId()) {
ChannelsModified |= Channel->SetLcn(lcn);
break;
}
}
}
}
}
break;
default: ;
}
delete d;
}
}
if (sectionSyncer.Processed(nit.getSectionNumber(), nit.getLastSectionNumber())) {
dbgnit(" trigger sdtFilter for current tp %d\n", Transponder());
sdtFilter->Trigger(Source());
}
StateKey.Remove(ChannelsModified);
}