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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 2.6 2009/06/21 13:46:20 kls Exp $
*/
#include "eit.h"
#include "epg.h"
#include "i18n.h"
#include "libsi/section.h"
#include "libsi/descriptor.h"
#define VALID_TIME (31536000 * 2) // two years
// --- cEIT ------------------------------------------------------------------
class cEIT : public SI::EIT {
public:
cEIT(cSchedules *Schedules, int Source, u_char Tid, const u_char *Data, bool OnlyRunningStatus = false);
};
cEIT::cEIT(cSchedules *Schedules, int Source, u_char Tid, const u_char *Data, bool OnlyRunningStatus)
:SI::EIT(Data, false)
{
if (!CheckCRCAndParse())
return;
tChannelID channelID(Source, getOriginalNetworkId(), getTransportStreamId(), getServiceId());
cChannel *channel = Channels.GetByChannelID(channelID, true);
if (!channel)
return; // only collect data for known channels
cSchedule *pSchedule = (cSchedule *)Schedules->GetSchedule(channel, true);
bool Empty = true;
bool Modified = false;
bool HasExternalData = false;
time_t SegmentStart = 0;
time_t SegmentEnd = 0;
time_t Now = time(NULL);
struct tm tm_r;
struct tm t = *localtime_r(&Now, &tm_r); // this initializes the time zone in 't'
if (Now < VALID_TIME)
return; // we need the current time for handling PDC descriptors
SI::EIT::Event SiEitEvent;
for (SI::Loop::Iterator it; eventLoop.getNext(SiEitEvent, it); ) {
bool ExternalData = false;
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;
if (!SegmentStart)
SegmentStart = StartTime;
SegmentEnd = StartTime + Duration;
cEvent *newEvent = NULL;
cEvent *rEvent = NULL;
cEvent *pEvent = (cEvent *)pSchedule->GetEvent(SiEitEvent.getEventId(), StartTime);
if (!pEvent) {
if (OnlyRunningStatus)
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());
if (!pEvent)
continue;
}
else {
// We have found an existing event, either through its event ID or its start time.
pEvent->SetSeen();
// If the existing event has a zero table ID it was defined externally and shall
// not be overwritten.
uchar TableID = pEvent->TableID();
if (TableID == 0x00) {
if (pEvent->Version() == getVersionNumber())
continue;
HasExternalData = ExternalData = true;
}
// If the new event has a higher table ID, let's skip it.
// The lower the table ID, the more "current" the information.
else if (Tid > TableID)
continue;
// If the new event comes from the same table and has the same version number
// as the existing one, let's skip it to avoid unnecessary work.
// Unfortunately some stations (like, e.g. "Premiere") broadcast their EPG data on several transponders (like
// the actual Premiere transponder and the Sat.1/Pro7 transponder), but use different version numbers on
// each of them :-( So if one DVB card is tuned to the Premiere transponder, while an other one is tuned
// to the Sat.1/Pro7 transponder, events will keep toggling because of the bogus version numbers.
else if (Tid == TableID && pEvent->Version() == getVersionNumber())
continue;
}
if (!ExternalData) {
pEvent->SetEventID(SiEitEvent.getEventId()); // unfortunately some stations use different event ids for the same event in different tables :-(
pEvent->SetTableID(Tid);
pEvent->SetStartTime(StartTime);
pEvent->SetDuration(Duration);
}
if (newEvent)
pSchedule->AddEvent(newEvent);
if (Tid == 0x4E) { // we trust only the present/following info on the actual TS
if (SiEitEvent.getRunningStatus() >= SI::RunningStatusNotRunning)
pSchedule->SetRunningStatus(pEvent, SiEitEvent.getRunningStatus(), channel);
}
if (OnlyRunningStatus)
continue; // do this before setting the version, so that the full update can be done later
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)); ) {
if (ExternalData && d->getDescriptorTag() != SI::ComponentDescriptorTag) {
delete d;
continue;
}
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) {
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:
break;
case SI::ParentalRatingDescriptorTag:
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);
pEvent->SetVps(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->GetEvent(tsed->getReferenceEventId());
if (!rEvent)
break;
pEvent->SetTitle(rEvent->Title());
pEvent->SetShortText(rEvent->ShortText());
pEvent->SetDescription(rEvent->Description());
}
break;
case SI::LinkageDescriptorTag: {
SI::LinkageDescriptor *ld = (SI::LinkageDescriptor *)d;
tChannelID linkID(Source, ld->getOriginalNetworkId(), ld->getTransportStreamId(), ld->getServiceId());
if (ld->getLinkageType() == 0xB0) { // 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
//fprintf(stderr, "Linkage %s %4d %4d %5d %5d %5d %5d %02X '%s'\n", hit ? "*" : "", channel->Number(), link ? link->Number() : -1, SiEitEvent.getEventId(), ld->getOriginalNetworkId(), ld->getTransportStreamId(), ld->getServiceId(), ld->getLinkageType(), linkName);//XXX
if (link) {
if (Setup.UpdateChannels == 1 || Setup.UpdateChannels >= 3)
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());
//XXX patFilter->Trigger();
}
if (link) {
if (!LinkChannels)
LinkChannels = new cLinkChannels;
LinkChannels->Add(new cLinkChannel(link));
}
}
else
channel->SetPortalName(linkName);
}
}
}
break;
case SI::ComponentDescriptorTag: {
SI::ComponentDescriptor *cd = (SI::ComponentDescriptor *)d;
uchar Stream = cd->getStreamContent();
uchar Type = cd->getComponentType();
if (1 <= Stream && Stream <= 4 && Type != 0) { // 1=video, 2=audio, 3=subtitles, 4=AC3
if (!Components)
Components = new cComponents;
char buffer[Utf8BufSize(256)];
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)];
pEvent->SetTitle(ShortEventDescriptor->name.getText(buffer, sizeof(buffer)));
pEvent->SetShortText(ShortEventDescriptor->text.getText(buffer, sizeof(buffer)));
}
else if (!HasExternalData) {
pEvent->SetTitle(NULL);
pEvent->SetShortText(NULL);
}
if (ExtendedEventDescriptors) {
char buffer[Utf8BufSize(ExtendedEventDescriptors->getMaximumTextLength(": ")) + 1];
pEvent->SetDescription(ExtendedEventDescriptors->getText(buffer, sizeof(buffer), ": "));
}
else if (!HasExternalData)
pEvent->SetDescription(NULL);
}
delete ExtendedEventDescriptors;
delete ShortEventDescriptor;
pEvent->SetComponents(Components);
if (!HasExternalData)
pEvent->FixEpgBugs();
if (LinkChannels)
channel->SetLinkChannels(LinkChannels);
Modified = true;
}
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 (OnlyRunningStatus)
return;
if (Modified) {
pSchedule->Sort();
if (!HasExternalData)
pSchedule->DropOutdated(SegmentStart, SegmentEnd, Tid, getVersionNumber());
Schedules->SetModified(pSchedule);
}
}
// --- cTDT ------------------------------------------------------------------
class cTDT : public SI::TDT {
private:
static cMutex mutex;
static int lastDiff;
public:
cTDT(const u_char *Data);
};
cMutex cTDT::mutex;
int cTDT::lastDiff = 0;
cTDT::cTDT(const u_char *Data)
:SI::TDT(Data, false)
{
CheckParse();
time_t sattim = getTime();
time_t loctim = time(NULL);
int diff = abs(sattim - loctim);
if (diff > 2) {
mutex.Lock();
if (abs(diff - lastDiff) < 3) {
if (stime(&sattim) == 0)
isyslog("system time changed from %s (%ld) to %s (%ld)", *TimeToString(loctim), loctim, *TimeToString(sattim), sattim);
else
esyslog("ERROR while setting system time: %m");
}
lastDiff = diff;
mutex.Unlock();
}
}
// --- cEitFilter ------------------------------------------------------------
cEitFilter::cEitFilter(void)
{
Set(0x12, 0x40, 0xC0); // event info now&next actual/other TS (0x4E/0x4F), future actual/other TS (0x5X/0x6X)
if (Setup.SetSystemTime && Setup.TimeTransponder)
Set(0x14, 0x70); // TDT
}
void cEitFilter::Process(u_short Pid, u_char Tid, const u_char *Data, int Length)
{
switch (Pid) {
case 0x12: {
if (Tid >= 0x4E && Tid <= 0x6F) {
cSchedulesLock SchedulesLock(true, 10);
cSchedules *Schedules = (cSchedules *)cSchedules::Schedules(SchedulesLock);
if (Schedules)
cEIT EIT(Schedules, Source(), Tid, Data);
else {
// If we don't get a write lock, let's at least get a read lock, so
// that we can set the running status and 'seen' timestamp (well, actually
// with a read lock we shouldn't be doing that, but it's only integers that
// get changed, so it should be ok)
cSchedulesLock SchedulesLock;
cSchedules *Schedules = (cSchedules *)cSchedules::Schedules(SchedulesLock);
if (Schedules)
cEIT EIT(Schedules, Source(), Tid, Data, true);
}
}
}
break;
case 0x14: {
if (Setup.SetSystemTime && Setup.TimeTransponder && ISTRANSPONDER(Transponder(), Setup.TimeTransponder))
cTDT TDT(Data);
}
break;
}
}
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