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vdr/sdt.c

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/*
* sdt.c: SDT section filter
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: sdt.c 5.2 2021/06/21 20:13:55 kls Exp $
*/
#include "sdt.h"
#include "channels.h"
#include "config.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
// Set to 'true' for debug output:
static bool DebugSdt = false;
#define dbgsdt(a...) if (DebugSdt) fprintf(stderr, a)
// --- cSdtFilter ------------------------------------------------------------
cSdtFilter::cSdtFilter(cPatFilter *PatFilter)
{
source = cSource::stNone;
lastSource = cSource::stNone;
lastTransponder = 0;
lastNid = 0;
lastTid = 0;
patFilter = PatFilter;
transponderState = tsUnknown;
Set(0x11, 0x42); // SDT actual TS
}
void cSdtFilter::SetStatus(bool On)
{
cMutexLock MutexLock(&mutex);
cFilter::SetStatus(On);
sectionSyncer.Reset();
if (!On)
source = cSource::stNone;
transponderState = tsUnknown;
}
void cSdtFilter::Trigger(int Source)
{
cMutexLock MutexLock(&mutex);
source = Source;
}
void cSdtFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
{
cMutexLock MutexLock(&mutex);
SI::SDT sdt(Data, false);
if (!sdt.CheckCRCAndParse())
return;
if (transponderState == tsUnknown) {
// The transponder can be verified with any section, no sync required:
int Nid = sdt.getOriginalNetworkId();
int Tid = sdt.getTransportStreamId();
if (Source() != lastSource || !ISTRANSPONDER(Transponder(), lastTransponder)) {
// We expect a change in NID/TID:
if (Nid && Tid && Nid == lastNid && Tid == lastTid) {
transponderState = tsWrong;
dsyslog("SDT: channel %d NID/TID (%d/%d) not found, got %d/%d", Channel()->Number(), Channel()->Nid(), Channel()->Tid(), Nid, Tid);
return;
}
}
// NID/TID is acceptable:
lastSource = Source();
lastTransponder = Transponder();
lastNid = Nid;
lastTid = Tid;
if (Nid == Channel()->Nid() && Tid == Channel()->Tid()) {
// NID/TID correspond with the channel data:
transponderState = tsVerified;
}
else {
// NID/TID differ from the channel data, but we accept it, since this *is* the data for this transponder:
transponderState = tsAccepted;
}
}
if (!(source && Transponder()))
return;
if (!sectionSyncer.Check(sdt.getVersionNumber(), sdt.getSectionNumber()))
return;
cStateKey StateKey;
cChannels *Channels = cChannels::GetChannelsWrite(StateKey, 10);
if (!Channels)
return;
dbgsdt("SDT: %2d %2d %2d %s %d\n", sdt.getVersionNumber(), sdt.getSectionNumber(), sdt.getLastSectionNumber(), *cSource::ToString(source), Transponder());
bool ChannelsModified = false;
bool TriggerPat = false;
SI::SDT::Service SiSdtService;
for (SI::Loop::Iterator it; sdt.serviceLoop.getNext(SiSdtService, it); ) {
cChannel *Channel = Channels->GetByChannelID(tChannelID(source, sdt.getOriginalNetworkId(), sdt.getTransportStreamId(), SiSdtService.getServiceId()));
if (!Channel)
Channel = Channels->GetByChannelID(tChannelID(source, 0, Transponder(), SiSdtService.getServiceId()));
if (Channel)
Channel->SetSeen();
cLinkChannels *LinkChannels = NULL;
SI::Descriptor *d;
for (SI::Loop::Iterator it2; (d = SiSdtService.serviceDescriptors.getNext(it2)); ) {
switch (d->getDescriptorTag()) {
case SI::ServiceDescriptorTag: {
SI::ServiceDescriptor *sd = (SI::ServiceDescriptor *)d;
switch (sd->getServiceType()) {
case 0x01: // digital television service
case 0x02: // digital radio sound service
case 0x04: // NVOD reference service
case 0x05: // NVOD time-shifted service
case 0x0A: // advanced codec digital radio sound service
case 0x16: // digital SD television service
case 0x19: // digital HD television service
case 0x1F: // HEVC digital television service
case 0x20: // HEVC UHD digital television service
{
char NameBuf[Utf8BufSize(1024)];
char ShortNameBuf[Utf8BufSize(1024)];
char ProviderNameBuf[Utf8BufSize(1024)];
sd->serviceName.getText(NameBuf, ShortNameBuf, sizeof(NameBuf), sizeof(ShortNameBuf));
char *pn = compactspace(NameBuf);
char *ps = compactspace(ShortNameBuf);
if (!*ps && cSource::IsCable(source)) {
// Some cable providers don't mark short channel names according to the
// standard, but rather go their own way and use "name>short name":
char *p = strchr(pn, '>'); // fix for UPC Wien
if (p && p > pn) {
*p++ = 0;
strcpy(ShortNameBuf, skipspace(p));
}
}
// Avoid ',' in short name (would cause trouble in channels.conf):
for (char *p = ShortNameBuf; *p; p++) {
if (*p == ',')
*p = '.';
}
sd->providerName.getText(ProviderNameBuf, sizeof(ProviderNameBuf));
char *pp = compactspace(ProviderNameBuf);
if (Channel) {
ChannelsModified |= Channel->SetId(Channels, sdt.getOriginalNetworkId(), sdt.getTransportStreamId(), SiSdtService.getServiceId());
if (Setup.UpdateChannels == 1 || Setup.UpdateChannels >= 3)
ChannelsModified |= Channel->SetName(pn, ps, pp);
// Using SiSdtService.getFreeCaMode() is no good, because some
// tv stations set this flag even for non-encrypted channels :-(
// The special value 0xFFFF was supposed to mean "unknown encryption"
// and would have been overwritten with real CA values later:
// Channel->SetCa(SiSdtService.getFreeCaMode() ? 0xFFFF : 0);
}
else if (*pn && Setup.UpdateChannels >= 4) {
dbgsdt(" %5d %5d %5d %s/%s %d %s\n", sdt.getOriginalNetworkId(), sdt.getTransportStreamId(), SiSdtService.getServiceId(), *cSource::ToString(this->Channel()->Source()), *cSource::ToString(source), this->Channel()->Transponder(), pn);
Channel = Channels->NewChannel(this->Channel(), pn, ps, pp, sdt.getOriginalNetworkId(), sdt.getTransportStreamId(), SiSdtService.getServiceId());
Channel->SetSource(source); // in case this comes from a satellite with a slightly different position
ChannelsModified = true;
TriggerPat = true;
}
}
default: ;
}
}
break;
// Using the CaIdentifierDescriptor is no good, because some tv stations
// just don't use it. The actual CA values are collected in pat.c:
/*
case SI::CaIdentifierDescriptorTag: {
SI::CaIdentifierDescriptor *cid = (SI::CaIdentifierDescriptor *)d;
if (Channel) {
for (SI::Loop::Iterator it; cid->identifiers.hasNext(it); )
Channel->SetCa(Channels, cid->identifiers.getNext(it));
}
}
break;
*/
case SI::NVODReferenceDescriptorTag: {
SI::NVODReferenceDescriptor *nrd = (SI::NVODReferenceDescriptor *)d;
SI::NVODReferenceDescriptor::Service Service;
for (SI::Loop::Iterator it; nrd->serviceLoop.getNext(Service, it); ) {
cChannel *link = Channels->GetByChannelID(tChannelID(source, Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId()));
if (!link && Setup.UpdateChannels >= 4) {
link = Channels->NewChannel(this->Channel(), "NVOD", "", "", Service.getOriginalNetworkId(), Service.getTransportStream(), Service.getServiceId());
ChannelsModified = true;
TriggerPat = true;
}
if (link) {
if (!LinkChannels)
LinkChannels = new cLinkChannels;
LinkChannels->Add(new cLinkChannel(link));
ChannelsModified = true;
}
}
}
break;
default: ;
}
delete d;
}
if (LinkChannels) {
if (Channel)
ChannelsModified |= Channel->SetLinkChannels(LinkChannels);
else
delete LinkChannels;
}
}
if (TriggerPat)
patFilter->Trigger();
if (sectionSyncer.Processed(sdt.getSectionNumber(), sdt.getLastSectionNumber())) {
if (Setup.UpdateChannels == 1 || Setup.UpdateChannels >= 3) {
ChannelsModified |= Channels->MarkObsoleteChannels(source, sdt.getOriginalNetworkId(), sdt.getTransportStreamId());
if (source != Source())
ChannelsModified |= Channels->MarkObsoleteChannels(Source(), sdt.getOriginalNetworkId(), sdt.getTransportStreamId());
}
}
StateKey.Remove(ChannelsModified);
}
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