summaryrefslogtreecommitdiff
path: root/eit.c
blob: b5c671d2671f886b57e0e1a47dc2708f0c2bdccb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
/*
 * 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 4.1 2015/08/23 10:43:36 kls Exp $
 */

#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

// --- cEIT ------------------------------------------------------------------

class cEIT : public SI::EIT {
public:
  cEIT(cSectionSyncerHash &SectionSyncerHash, int Source, u_char Tid, const u_char *Data);
  };

cEIT::cEIT(cSectionSyncerHash &SectionSyncerHash, int Source, u_char Tid, const u_char *Data)
:SI::EIT(Data, false)
{
  if (!CheckCRCAndParse())
     return;
  int HashId = Tid * getServiceId();
  cSectionSyncerEntry *SectionSyncerEntry = SectionSyncerHash.Get(HashId);
  if (!SectionSyncerEntry) {
     SectionSyncerEntry = new cSectionSyncerEntry;
     SectionSyncerHash.Add(SectionSyncerEntry, HashId);
     }
  bool Process = SectionSyncerEntry->Sync(getVersionNumber(), getSectionNumber(), getLastSectionNumber());
  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) {
     SectionSyncerEntry->Repeat(); // let's not miss any section of the EIT
     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) {
     SectionSyncerEntry->Repeat(); // let's not miss any section of the EIT
     ChannelsStateKey.Remove(false);
     return;
     }

  bool ChannelsModified = false;
  EpgHandlers.BeginSegmentTransfer(Channel);
  bool handledExternally = EpgHandlers.HandledExternally(Channel);
  cSchedule *pSchedule = (cSchedule *)Schedules->GetSchedule(Channel, true);

  bool Empty = true;
  bool Modified = false;
  time_t SegmentStart = 0;
  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;
      if (!SegmentStart)
         SegmentStart = StartTime;
      SegmentEnd = StartTime + Duration;
      cEvent *newEvent = NULL;
      cEvent *rEvent = NULL;
      cEvent *pEvent = (cEvent *)pSchedule->GetEvent(SiEitEvent.getEventId(), 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"
         // If the new event has a higher table ID, let's skip it.
         // The lower the table ID, the more "current" the information.
         if (Tid > TableID)
            continue;
         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
         if (SiEitEvent.getRunningStatus() >= SI::RunningStatusNotRunning)
            pSchedule->SetRunningStatus(pEvent, SiEitEvent.getRunningStatus(), 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->GetEvent(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 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
                    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)];
            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 (Modified) {
     EpgHandlers.SortSchedule(pSchedule);
     EpgHandlers.DropOutdated(pSchedule, SegmentStart, SegmentEnd, Tid, getVersionNumber());
     pSchedule->SetModified();
     }
  SchedulesStateKey.Remove(Modified);
  ChannelsStateKey.Remove(ChannelsModified);
  EpgHandlers.EndSegmentTransfer(Modified);
}

// --- 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) {
        if (stime(&dvbtim) == 0)
           isyslog("system time changed from %s (%ld) to %s (%ld)", *TimeToString(loctim), loctim, *TimeToString(dvbtim), 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 (%ld) to %s (%ld)", *TimeToString(loctim), loctim, *TimeToString(dvbtim), 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 now&next 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);
  sectionSyncerHash.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 <= 0x6F)
            cEIT EIT(sectionSyncerHash, Source(), Tid, Data);
         }
         break;
    case 0x14: {
         if (Setup.SetSystemTime && Setup.TimeSource == Source() && Setup.TimeTransponder && ISTRANSPONDER(Transponder(), Setup.TimeTransponder))
            cTDT TDT(Data);
         }
         break;
    default: ;
    }
}