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vdr/eit.c

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/*
* eit.c: EIT section filter
*
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* Original version (as used in VDR before 1.3.0) written by
* Robert Schneider <Robert.Schneider@web.de> and Rolf Hakenes <hakenes@hippomi.de>.
* Adapted to 'libsi' for VDR 1.3.0 by Marcel Wiesweg <marcel.wiesweg@gmx.de>.
*
* $Id: eit.c 5.6 2022/12/23 09:47:23 kls Exp $
*/
// The various ways in which broadcasters handle (or screw up) their EPG:
// - Some use the same version for all tables, and use unique event ids, which are the same in
// both the 0x5X and the 0x6X tables. And once an event has an id, it keeps it until it is
// no longer in the tables. Those are the good guys!
// - Some use separate versions for each table (0x50, 0x51, ...).
// - Some broadcast tables 0x5X and 0x6X, but use different event ids for the same event in both
// sets of tables, and sometimes even use different titles, short texts or descriptions.
// - Some broadcast the full EPG only on one transponder (tables 0x6X), and on the actual transponder
// they provide only the present/following information.
// - Some have overlapping events, especially when they mess up daylight saving time.
// - Some use all new event ids every time they update their tables.
// So, to bring order to chaos, VDR does as follows:
// - Completely ignore table 0x4F.
// - Once a schedule has seen events from 0x5X, tables 0x6X are ignored for that schedule.
// - When looking up an event in its schedule, the start time is used for tables 0x6X, and the
// event id for tables 0x4E and 0x5X.
#include "eit.h"
#include <sys/time.h>
#include "epg.h"
#include "i18n.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
#define VALID_TIME (31536000 * 2) // two years
#define DBGEIT 0
// --- cEitTables ------------------------------------------------------------
cEitTables::cEitTables(void)
{
complete = false;
tableStart = 0;
tableEnd = 0;
}
bool cEitTables::Check(uchar TableId, uchar Version, int SectionNumber)
{
int ti = Index(TableId);
return sectionSyncer[ti].Check(Version, SectionNumber);
}
bool cEitTables::Processed(uchar TableId, uchar LastTableId, int SectionNumber, int LastSectionNumber, int SegmentLastSectionNumber)
{
bool Result = false;
int ti = Index(TableId);
int LastIndex = Index(LastTableId);
complete = false;
if (sectionSyncer[ti].Processed(SectionNumber, LastSectionNumber, SegmentLastSectionNumber)) {
Result = true; // the table with TableId is complete
for (int i = 0; i <= LastIndex; i++) {
if (!sectionSyncer[i].Complete())
return Result;
}
complete = true; // all tables have been processed
}
return Result;
}
// --- cEIT ------------------------------------------------------------------
class cEIT : public SI::EIT {
public:
cEIT(cEitTablesHash &EitTablesHash, int Source, u_char Tid, const u_char *Data);
};
cEIT::cEIT(cEitTablesHash &EitTablesHash, int Source, u_char Tid, const u_char *Data)
:SI::EIT(Data, false)
{
if (!CheckCRCAndParse())
return;
int HashId = getServiceId();
cEitTables *EitTables = EitTablesHash.Get(HashId);
if (!EitTables) {
EitTables = new cEitTables;
EitTablesHash.Add(EitTables, HashId);
}
bool Process = EitTables->Check(Tid, getVersionNumber(), getSectionNumber());
if (Tid != 0x4E && !Process) // we need to set the 'seen' tag to watch the running status of the present/following event
return;
time_t Now = time(NULL);
if (Now < VALID_TIME)
return; // we need the current time for handling PDC descriptors
cStateKey ChannelsStateKey;
cChannels *Channels = cChannels::GetChannelsWrite(ChannelsStateKey, 10);
if (!Channels)
return;
tChannelID channelID(Source, getOriginalNetworkId(), getTransportStreamId(), getServiceId());
cChannel *Channel = Channels->GetByChannelID(channelID, true);
if (!Channel || EpgHandlers.IgnoreChannel(Channel)) {
ChannelsStateKey.Remove(false);
return;
}
cStateKey SchedulesStateKey;
cSchedules *Schedules = cSchedules::GetSchedulesWrite(SchedulesStateKey, 10);
if (!Schedules) {
ChannelsStateKey.Remove(false);
return;
}
cSchedule *pSchedule = (cSchedule *)Schedules->GetSchedule(Channel, true);
if (pSchedule->OnActualTp(Tid) && (Tid & 0xF0) == 0x60) {
SchedulesStateKey.Remove(false);
ChannelsStateKey.Remove(false);
return;
}
if (!EpgHandlers.BeginSegmentTransfer(Channel)) {
SchedulesStateKey.Remove(false);
ChannelsStateKey.Remove(false);
return;
}
bool ChannelsModified = false;
bool handledExternally = EpgHandlers.HandledExternally(Channel);
bool Empty = true;
bool Modified = false;
time_t LingerLimit = Now - EPG_LINGER_TIME;
time_t SegmentStart = 0; // these are actually "section" start/end times
time_t SegmentEnd = 0;
struct tm t = { 0 };
localtime_r(&Now, &t); // this initializes the time zone in 't'
SI::EIT::Event SiEitEvent;
for (SI::Loop::Iterator it; eventLoop.getNext(SiEitEvent, it); ) {
if (EpgHandlers.HandleEitEvent(pSchedule, &SiEitEvent, Tid, getVersionNumber()))
continue; // an EPG handler has done all of the processing
time_t StartTime = SiEitEvent.getStartTime();
int Duration = SiEitEvent.getDuration();
// Drop bogus events - but keep NVOD reference events, where all bits of the start time field are set to 1, resulting in a negative number.
if (StartTime == 0 || StartTime > 0 && Duration == 0)
continue;
Empty = false;
// Ignore events that ended before the "EPG linger time":
if (StartTime + Duration < LingerLimit)
continue;
if (!SegmentStart)
SegmentStart = StartTime;
SegmentEnd = StartTime + Duration;
if (Tid == 0x4E) {
if (getSectionNumber() == 0)
EitTables->SetTableStart(SegmentStart);
else
EitTables->SetTableEnd(SegmentEnd);
}
cEvent *newEvent = NULL;
cEvent *rEvent = NULL;
cEvent *pEvent = NULL;
if (Tid == 0x4E || (Tid & 0xF0) == 0x50)
pEvent = const_cast<cEvent *>(pSchedule->GetEventById(SiEitEvent.getEventId()));
else
pEvent = const_cast<cEvent *>(pSchedule->GetEventByTime(StartTime));
if (!pEvent || handledExternally) {
if (handledExternally && !EpgHandlers.IsUpdate(SiEitEvent.getEventId(), StartTime, Tid, getVersionNumber()))
continue;
// If we don't have that event yet, we create a new one.
// Otherwise we copy the information into the existing event anyway, because the data might have changed.
pEvent = newEvent = new cEvent(SiEitEvent.getEventId());
newEvent->SetStartTime(StartTime);
newEvent->SetDuration(Duration);
if (!handledExternally)
pSchedule->AddEvent(newEvent);
}
else {
// We have found an existing event, either through its event ID or its start time.
pEvent->SetSeen();
uchar TableID = max(pEvent->TableID(), uchar(0x4E)); // for backwards compatibility, table ids less than 0x4E are treated as if they were "present"
// We never overwrite present/following with events from other tables:
if (TableID == 0x4E && Tid != 0x4E)
continue;
if (pEvent->HasTimer()) {
if (pEvent->StartTime() != StartTime || pEvent->Duration() != Duration)
dsyslog("channel %d (%s) event %s times changed to %s-%s", Channel->Number(), Channel->Name(), *pEvent->ToDescr(), *TimeString(StartTime), *TimeString(StartTime + Duration));
}
EpgHandlers.SetEventID(pEvent, SiEitEvent.getEventId()); // unfortunately some stations use different event ids for the same event in different tables :-(
EpgHandlers.SetStartTime(pEvent, StartTime);
EpgHandlers.SetDuration(pEvent, Duration);
}
if (pEvent->TableID() > 0x4E) // for backwards compatibility, table ids less than 0x4E are never overwritten
pEvent->SetTableID(Tid);
if (Tid == 0x4E) { // we trust only the present/following info on the actual TS
int RunningStatus = SiEitEvent.getRunningStatus();
#if DBGEIT
if (Process)
dsyslog("channel %d (%s) event %s status %d (raw data from '%s' section)", Channel->Number(), Channel->Name(), *pEvent->ToDescr(), RunningStatus, getSectionNumber() ? "following" : "present");
#endif
if (RunningStatus >= SI::RunningStatusNotRunning) {
// Workaround for broadcasters who set an event to status "not running" where
// this is inappropriate:
if (RunningStatus != pEvent->RunningStatus()) { // if the running status of the event has changed...
if (RunningStatus == SI::RunningStatusNotRunning) { // ...and the new status is "not running"...
int OverrideStatus = -1;
if (getSectionNumber() == 0) { // ...and if this the "present" event...
if (pEvent->RunningStatus() == SI::RunningStatusPausing) // ...and if the event has already been set to "pausing"...
OverrideStatus = SI::RunningStatusPausing; // ...then we ignore the faulty new status and stay with "pausing"
}
else // ...and if this is the "following" event...
OverrideStatus = SI::RunningStatusUndefined; // ...then we ignore the faulty new status and fall back to "undefined"
if (OverrideStatus >= 0) {
#if DBGEIT
if (Process)
dsyslog("channel %d (%s) event %s status %d (ignored status %d from '%s' section)", Channel->Number(), Channel->Name(), *pEvent->ToDescr(), OverrideStatus, RunningStatus, getSectionNumber() ? "following" : "present");
#endif
RunningStatus = OverrideStatus;
}
}
}
pSchedule->SetRunningStatus(pEvent, RunningStatus, Channel);
}
if (!Process)
continue;
}
pEvent->SetVersion(getVersionNumber());
int LanguagePreferenceShort = -1;
int LanguagePreferenceExt = -1;
bool UseExtendedEventDescriptor = false;
SI::Descriptor *d;
SI::ExtendedEventDescriptors *ExtendedEventDescriptors = NULL;
SI::ShortEventDescriptor *ShortEventDescriptor = NULL;
cLinkChannels *LinkChannels = NULL;
cComponents *Components = NULL;
for (SI::Loop::Iterator it2; (d = SiEitEvent.eventDescriptors.getNext(it2)); ) {
switch (d->getDescriptorTag()) {
case SI::ExtendedEventDescriptorTag: {
SI::ExtendedEventDescriptor *eed = (SI::ExtendedEventDescriptor *)d;
if (I18nIsPreferredLanguage(Setup.EPGLanguages, eed->languageCode, LanguagePreferenceExt) || !ExtendedEventDescriptors) {
delete ExtendedEventDescriptors;
ExtendedEventDescriptors = new SI::ExtendedEventDescriptors;
UseExtendedEventDescriptor = true;
}
if (UseExtendedEventDescriptor) {
if (ExtendedEventDescriptors->Add(eed))
d = NULL; // so that it is not deleted
}
if (eed->getDescriptorNumber() == eed->getLastDescriptorNumber())
UseExtendedEventDescriptor = false;
}
break;
case SI::ShortEventDescriptorTag: {
SI::ShortEventDescriptor *sed = (SI::ShortEventDescriptor *)d;
if (I18nIsPreferredLanguage(Setup.EPGLanguages, sed->languageCode, LanguagePreferenceShort) || !ShortEventDescriptor) {
delete ShortEventDescriptor;
ShortEventDescriptor = sed;
d = NULL; // so that it is not deleted
}
}
break;
case SI::ContentDescriptorTag: {
SI::ContentDescriptor *cd = (SI::ContentDescriptor *)d;
SI::ContentDescriptor::Nibble Nibble;
int NumContents = 0;
uchar Contents[MaxEventContents] = { 0 };
for (SI::Loop::Iterator it3; cd->nibbleLoop.getNext(Nibble, it3); ) {
if (NumContents < MaxEventContents) {
Contents[NumContents] = ((Nibble.getContentNibbleLevel1() & 0xF) << 4) | (Nibble.getContentNibbleLevel2() & 0xF);
NumContents++;
}
}
EpgHandlers.SetContents(pEvent, Contents);
}
break;
case SI::ParentalRatingDescriptorTag: {
int LanguagePreferenceRating = -1;
SI::ParentalRatingDescriptor *prd = (SI::ParentalRatingDescriptor *)d;
SI::ParentalRatingDescriptor::Rating Rating;
for (SI::Loop::Iterator it3; prd->ratingLoop.getNext(Rating, it3); ) {
if (I18nIsPreferredLanguage(Setup.EPGLanguages, Rating.languageCode, LanguagePreferenceRating)) {
int ParentalRating = (Rating.getRating() & 0xFF);
switch (ParentalRating) {
// values defined by the DVB standard (minimum age = rating + 3 years):
case 0x01 ... 0x0F: ParentalRating += 3; break;
// values defined by broadcaster CSAT (now why didn't they just use 0x07, 0x09 and 0x0D?):
case 0x11: ParentalRating = 10; break;
case 0x12: ParentalRating = 12; break;
case 0x13: ParentalRating = 16; break;
default: ParentalRating = 0;
}
EpgHandlers.SetParentalRating(pEvent, ParentalRating);
}
}
}
break;
case SI::PDCDescriptorTag: {
SI::PDCDescriptor *pd = (SI::PDCDescriptor *)d;
t.tm_isdst = -1; // makes sure mktime() will determine the correct DST setting
int month = t.tm_mon;
t.tm_mon = pd->getMonth() - 1;
t.tm_mday = pd->getDay();
t.tm_hour = pd->getHour();
t.tm_min = pd->getMinute();
t.tm_sec = 0;
if (month == 11 && t.tm_mon == 0) // current month is dec, but event is in jan
t.tm_year++;
else if (month == 0 && t.tm_mon == 11) // current month is jan, but event is in dec
t.tm_year--;
time_t vps = mktime(&t);
EpgHandlers.SetVps(pEvent, vps);
}
break;
case SI::TimeShiftedEventDescriptorTag: {
SI::TimeShiftedEventDescriptor *tsed = (SI::TimeShiftedEventDescriptor *)d;
cSchedule *rSchedule = (cSchedule *)Schedules->GetSchedule(tChannelID(Source, Channel->Nid(), Channel->Tid(), tsed->getReferenceServiceId()));
if (!rSchedule)
break;
rEvent = (cEvent *)rSchedule->GetEventById(tsed->getReferenceEventId());
if (!rEvent)
break;
EpgHandlers.SetTitle(pEvent, rEvent->Title());
EpgHandlers.SetShortText(pEvent, rEvent->ShortText());
EpgHandlers.SetDescription(pEvent, rEvent->Description());
}
break;
case SI::LinkageDescriptorTag: {
SI::LinkageDescriptor *ld = (SI::LinkageDescriptor *)d;
tChannelID linkID(Source, ld->getOriginalNetworkId(), ld->getTransportStreamId(), ld->getServiceId());
if (ld->getLinkageType() == SI::LinkageTypePremiere) { // Premiere World
bool hit = StartTime <= Now && Now < StartTime + Duration;
if (hit) {
char linkName[ld->privateData.getLength() + 1];
strn0cpy(linkName, (const char *)ld->privateData.getData(), sizeof(linkName));
// TODO is there a standard way to determine the character set of this string?
cChannel *link = Channels->GetByChannelID(linkID);
if (link != Channel) { // only link to other channels, not the same one
if (link) {
if (Setup.UpdateChannels == 1 || Setup.UpdateChannels >= 3)
ChannelsModified |= link->SetName(linkName, "", "");
}
else if (Setup.UpdateChannels >= 4) {
cChannel *Transponder = Channel;
if (Channel->Tid() != ld->getTransportStreamId())
Transponder = Channels->GetByTransponderID(linkID);
link = Channels->NewChannel(Transponder, linkName, "", "", ld->getOriginalNetworkId(), ld->getTransportStreamId(), ld->getServiceId());
ChannelsModified = true;
//XXX patFilter->Trigger();
}
if (link) {
if (!LinkChannels)
LinkChannels = new cLinkChannels;
LinkChannels->Add(new cLinkChannel(link));
}
}
else
ChannelsModified |= Channel->SetPortalName(linkName);
}
}
}
break;
case SI::ComponentDescriptorTag: {
SI::ComponentDescriptor *cd = (SI::ComponentDescriptor *)d;
uchar Stream = cd->getStreamContent();
uchar Ext = cd->getStreamContentExt();
uchar Type = cd->getComponentType();
if ((1 <= Stream && Stream <= 6 && Type != 0) // 1=MPEG2-video, 2=MPEG1-audio, 3=subtitles, 4=AC3-audio, 5=H.264-video, 6=HEAAC-audio
|| (Stream == 9 && Ext < 2)) { // 0x09=HEVC-video, 0x19=AC-4-audio
if (!Components)
Components = new cComponents;
char buffer[Utf8BufSize(256)];
if (Stream == 9)
Stream |= Ext << 4;
Components->SetComponent(Components->NumComponents(), Stream, Type, I18nNormalizeLanguageCode(cd->languageCode), cd->description.getText(buffer, sizeof(buffer)));
}
}
break;
default: ;
}
delete d;
}
if (!rEvent) {
if (ShortEventDescriptor) {
char buffer[Utf8BufSize(256)];
EpgHandlers.SetTitle(pEvent, ShortEventDescriptor->name.getText(buffer, sizeof(buffer)));
EpgHandlers.SetShortText(pEvent, ShortEventDescriptor->text.getText(buffer, sizeof(buffer)));
}
else {
EpgHandlers.SetTitle(pEvent, NULL);
EpgHandlers.SetShortText(pEvent, NULL);
}
if (ExtendedEventDescriptors) {
char buffer[Utf8BufSize(ExtendedEventDescriptors->getMaximumTextLength(": ")) + 1];
EpgHandlers.SetDescription(pEvent, ExtendedEventDescriptors->getText(buffer, sizeof(buffer), ": "));
}
else
EpgHandlers.SetDescription(pEvent, NULL);
}
delete ExtendedEventDescriptors;
delete ShortEventDescriptor;
EpgHandlers.SetComponents(pEvent, Components);
EpgHandlers.FixEpgBugs(pEvent);
if (LinkChannels)
ChannelsModified |= Channel->SetLinkChannels(LinkChannels);
Modified = true;
EpgHandlers.HandleEvent(pEvent);
if (handledExternally)
delete pEvent;
}
if (Tid == 0x4E) {
if (Empty && getSectionNumber() == 0)
// ETR 211: an empty entry in section 0 of table 0x4E means there is currently no event running
pSchedule->ClrRunningStatus(Channel);
pSchedule->SetPresentSeen();
}
if (Process) {
bool Complete = EitTables->Processed(Tid, getLastTableId(), getSectionNumber(), getLastSectionNumber(), getSegmentLastSectionNumber());
if (Modified && (Tid >= 0x50 || Complete)) { // we process the 0x5X tables segment by segment, but 0x4E only if we have received ALL its segments (0 and 1, i.e. "present" and "following")
if (Tid == 0x4E && getLastSectionNumber() == 1) {
SegmentStart = EitTables->TableStart();
SegmentEnd = EitTables->TableEnd();
}
EpgHandlers.SortSchedule(pSchedule);
EpgHandlers.DropOutdated(pSchedule, SegmentStart, SegmentEnd, Tid, getVersionNumber());
}
}
EpgHandlers.EndSegmentTransfer(Modified);
SchedulesStateKey.Remove(Modified);
ChannelsStateKey.Remove(ChannelsModified);
}
// --- cTDT ------------------------------------------------------------------
#define MAX_TIME_DIFF 1 // number of seconds the local time may differ from dvb time before making any corrections
#define MAX_ADJ_DIFF 10 // number of seconds the local time may differ from dvb time to allow smooth adjustment
#define ADJ_DELTA 300 // number of seconds between calls for smooth time adjustment
class cTDT : public SI::TDT {
private:
static cMutex mutex;
static time_t lastAdj;
public:
cTDT(const u_char *Data);
};
cMutex cTDT::mutex;
time_t cTDT::lastAdj = 0;
cTDT::cTDT(const u_char *Data)
:SI::TDT(Data, false)
{
CheckParse();
time_t dvbtim = getTime();
time_t loctim = time(NULL);
int diff = dvbtim - loctim;
if (abs(diff) > MAX_TIME_DIFF) {
mutex.Lock();
if (abs(diff) > MAX_ADJ_DIFF) {
timespec ts = {};
ts.tv_sec = dvbtim;
if (clock_settime(CLOCK_REALTIME, &ts) == 0)
isyslog("system time changed from %s (%jd) to %s (%jd)", *TimeToString(loctim), intmax_t(loctim), *TimeToString(dvbtim), intmax_t(dvbtim));
else
esyslog("ERROR while setting system time: %m");
}
else if (time(NULL) - lastAdj > ADJ_DELTA) {
lastAdj = time(NULL);
timeval delta;
delta.tv_sec = diff;
delta.tv_usec = 0;
if (adjtime(&delta, NULL) == 0)
isyslog("system time adjustment initiated from %s (%jd) to %s (%jd)", *TimeToString(loctim), intmax_t(loctim), *TimeToString(dvbtim), intmax_t(dvbtim));
else
esyslog("ERROR while adjusting system time: %m");
}
mutex.Unlock();
}
}
// --- cEitFilter ------------------------------------------------------------
time_t cEitFilter::disableUntil = 0;
cEitFilter::cEitFilter(void)
{
Set(0x12, 0x40, 0xC0); // event info present&following actual/other TS (0x4E/0x4F), future actual/other TS (0x5X/0x6X)
Set(0x14, 0x70); // TDT
}
void cEitFilter::SetStatus(bool On)
{
cMutexLock MutexLock(&mutex);
cFilter::SetStatus(On);
eitTablesHash.Clear();
}
void cEitFilter::SetDisableUntil(time_t Time)
{
disableUntil = Time;
}
void cEitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
{
cMutexLock MutexLock(&mutex);
if (disableUntil) {
if (time(NULL) > disableUntil)
disableUntil = 0;
else
return;
}
switch (Pid) {
case 0x12: {
if (Tid == 0x4E || Tid >= 0x50 && Tid <= 0x6F) // we ignore 0x4F, which only causes trouble
cEIT EIT(eitTablesHash, Source(), Tid, Data);
}
break;
case 0x14: {
if (Setup.SetSystemTime && Setup.TimeSource == Source() && Setup.TimeTransponder && ISTRANSPONDER(Transponder(), Setup.TimeTransponder))
cTDT TDT(Data);
}
break;
default: ;
}
}
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