code.vuplus.com Git - vuplus_dvbapp/blob - lib/dvb/pvrparse.cpp

   1 #include <lib/dvb/pvrparse.h>
   2 #include <lib/base/eerror.h>
   3 #include <byteswap.h>
   4
   5 #ifndef BYTE_ORDER
   6 #error no byte order defined!
   7 #endif
   8
   9 eMPEGStreamInformation::eMPEGStreamInformation()
  10         : m_structure_cache_entries(0), m_structure_read(0), m_structure_write(0)
  11 {
  12 }
  13
  14 eMPEGStreamInformation::~eMPEGStreamInformation()
  15 {
  16         if (m_structure_read)
  17                 fclose(m_structure_read);
  18         if (m_structure_write)
  19                 fclose(m_structure_write);
  20 }
  21
  22 int eMPEGStreamInformation::startSave(const char *filename)
  23 {
  24         m_filename = filename;
  25         m_structure_write = fopen((m_filename + ".sc").c_str(), "wb");
  26         return 0;
  27 }
  28
  29 int eMPEGStreamInformation::stopSave(void)
  30 {
  31         if (m_structure_write)
  32         {
  33                 fclose(m_structure_write);
  34                 m_structure_write = 0;
  35         }
  36
  37         if (m_access_points.empty())
  38                 return 0;
  39
  40         if (m_filename == "")
  41                 return -1;
  42         FILE *f = fopen((m_filename + ".ap").c_str(), "wb");
  43         if (!f)
  44                 return -1;
  45
  46         for (std::map<off_t, pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
  47         {
  48                 unsigned long long d[2];
  49 #if BYTE_ORDER == BIG_ENDIAN
  50                 d[0] = i->first;
  51                 d[1] = i->second;
  52 #else
  53                 d[0] = bswap_64(i->first);
  54                 d[1] = bswap_64(i->second);
  55 #endif
  56                 fwrite(d, sizeof(d), 1, f);
  57         }
  58         fclose(f);
  59
  60         return 0;
  61 }
  62
  63 int eMPEGStreamInformation::load(const char *filename)
  64 {
  65         m_filename = filename;
  66         if (m_structure_read)
  67                 fclose(m_structure_read);
  68         m_structure_read = fopen((std::string(m_filename) + ".sc").c_str(), "rb");
  69         m_access_points.clear();
  70         m_pts_to_offset.clear();
  71         m_timestamp_deltas.clear();
  72         FILE *f = fopen((std::string(m_filename) + ".ap").c_str(), "rb");
  73         if (!f)
  74                 return -1;
  75         while (1)
  76         {
  77                 unsigned long long d[2];
  78                 if (fread(d, sizeof(d), 1, f) < 1)
  79                         break;
  80
  81 #if BYTE_ORDER == LITTLE_ENDIAN
  82                 d[0] = bswap_64(d[0]);
  83                 d[1] = bswap_64(d[1]);
  84 #endif
  85                 m_access_points[d[0]] = d[1];
  86                 m_pts_to_offset.insert(std::pair<pts_t,off_t>(d[1], d[0]));
  87         }
  88         fclose(f);
  89         fixupDiscontinuties();
  90         return 0;
  91 }
  92
  93 void eMPEGStreamInformation::fixupDiscontinuties()
  94 {
  95         m_timestamp_deltas.clear();
  96         if (!m_access_points.size())
  97                 return;
  98
  99 //      eDebug("Fixing discontinuities ...");
 100
 101                         /* if we have no delta at the beginning, extrapolate it */
 102         if ((m_access_points.find(0) == m_access_points.end()) && (m_access_points.size() > 1))
 103         {
 104                 std::map<off_t,pts_t>::const_iterator second = m_access_points.begin();
 105                 std::map<off_t,pts_t>::const_iterator first  = second++;
 106                 if (first->first < second->first) /* i.e., not equal or broken */
 107                 {
 108                         off_t diff = second->first - first->first;
 109                         pts_t tdiff = second->second - first->second;
 110                         tdiff *= first->first;
 111                         tdiff /= diff;
 112                         m_timestamp_deltas[0] = first->second - tdiff;
 113 //                      eDebug("first delta is %08llx", first->second - tdiff);
 114                 }
 115         }
 116
 117         if (m_timestamp_deltas.empty())
 118                 m_timestamp_deltas[m_access_points.begin()->first] = m_access_points.begin()->second;
 119
 120         pts_t currentDelta = m_timestamp_deltas.begin()->second, lastpts_t = 0;
 121         for (std::map<off_t,pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
 122         {
 123                 pts_t current = i->second - currentDelta;
 124                 pts_t diff = current - lastpts_t;
 125
 126                 if (llabs(diff) > (90000*10)) // 10sec diff
 127                 {
 128 //                      eDebug("%llx < %llx, have discont. new timestamp is %llx (diff is %llx)!", current, lastpts_t, i->second, diff);
 129                         currentDelta = i->second - lastpts_t; /* FIXME: should be the extrapolated new timestamp, based on the current rate */
 130 //                      eDebug("current delta now %llx, making current to %llx", currentDelta, i->second - currentDelta);
 131                         m_timestamp_deltas[i->first] = currentDelta;
 132                 }
 133                 lastpts_t = i->second - currentDelta;
 134         }
 135
 136
 137 //      eDebug("ok, found %d disconts.", m_timestamp_deltas.size());
 138
 139 #if 0
 140         for (off_t x=0x25807E34ULL; x < 0x25B3CF70; x+= 100000)
 141         {
 142                 off_t o = x;
 143                 pts_t p;
 144                 int r = getPTS(o, p);
 145                 eDebug("%08llx -> %08llx | %08llx, %d, %08llx %08llx", x, getDelta(x), getInterpolated(x), r, o, p);
 146         }
 147 #endif
 148 }
 149
 150 pts_t eMPEGStreamInformation::getDelta(off_t offset)
 151 {
 152         if (!m_timestamp_deltas.size())
 153                 return 0;
 154         std::map<off_t,pts_t>::iterator i = m_timestamp_deltas.upper_bound(offset);
 155
 156                 /* i can be the first when you query for something before the first PTS */
 157         if (i != m_timestamp_deltas.begin())
 158                 --i;
 159
 160         return i->second;
 161 }
 162
 163 int eMPEGStreamInformation::fixupPTS(const off_t &offset, pts_t &ts)
 164 {
 165         if (!m_timestamp_deltas.size())
 166                 return -1;
 167
 168         std::multimap<pts_t, off_t>::const_iterator
 169                 l = m_pts_to_offset.upper_bound(ts - 60 * 90000),
 170                 u = m_pts_to_offset.upper_bound(ts + 60 * 90000),
 171                 nearest = m_pts_to_offset.end();
 172
 173         while (l != u)
 174         {
 175                 if ((nearest == m_pts_to_offset.end()) || (llabs(l->first - ts) < llabs(nearest->first - ts)))
 176                         nearest = l;
 177                 ++l;
 178         }
 179         if (nearest == m_pts_to_offset.end())
 180                 return 1;
 181
 182         ts -= getDelta(nearest->second);
 183
 184         return 0;
 185 }
 186
 187 int eMPEGStreamInformation::getPTS(off_t &offset, pts_t &pts)
 188 {
 189         std::map<off_t,pts_t>::iterator before = m_access_points.lower_bound(offset);
 190
 191                 /* usually, we prefer the AP before the given offset. however if there is none, we take any. */
 192         if (before != m_access_points.begin())
 193                 --before;
 194
 195         if (before == m_access_points.end())
 196         {
 197                 pts = 0;
 198                 return -1;
 199         }
 200
 201         offset = before->first;
 202         pts = before->second - getDelta(offset);
 203
 204         return 0;
 205 }
 206
 207 pts_t eMPEGStreamInformation::getInterpolated(off_t offset)
 208 {
 209                 /* get the PTS values before and after the offset. */
 210         std::map<off_t,pts_t>::iterator before, after;
 211         after = m_access_points.upper_bound(offset);
 212         before = after;
 213
 214         if (before != m_access_points.begin())
 215                 --before;
 216         else    /* we query before the first known timestamp ... FIXME */
 217                 return 0;
 218
 219                 /* empty... */
 220         if (before == m_access_points.end())
 221                 return 0;
 222
 223                 /* if after == end, then we need to extrapolate ... FIXME */
 224         if ((before->first == offset) || (after == m_access_points.end()))
 225                 return before->second - getDelta(offset);
 226
 227         pts_t before_ts = before->second - getDelta(before->first);
 228         pts_t after_ts = after->second - getDelta(after->first);
 229
 230 //      eDebug("%08llx .. ? .. %08llx", before_ts, after_ts);
 231 //      eDebug("%08llx .. %08llx .. %08llx", before->first, offset, after->first);
 232
 233         pts_t diff = after_ts - before_ts;
 234         off_t diff_off = after->first - before->first;
 235
 236         diff = (offset - before->first) * diff / diff_off;
 237 //      eDebug("%08llx .. %08llx .. %08llx", before_ts, before_ts + diff, after_ts);
 238         return before_ts + diff;
 239 }
 240
 241 off_t eMPEGStreamInformation::getAccessPoint(pts_t ts, int marg)
 242 {
 243                 /* FIXME: more efficient implementation */
 244         off_t last = 0;
 245         off_t last2 = 0;
 246         pts_t lastc = 0;
 247         ts += 1; // Add rounding error margin
 248         for (std::map<off_t, pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
 249         {
 250                 pts_t delta = getDelta(i->first);
 251                 pts_t c = i->second - delta;
 252                 if (c > ts) {
 253                         if (marg > 0)
 254                                 return (last + i->first)/376*188;
 255                         else if (marg < 0)
 256                                 return (last + last2)/376*188;
 257                         else
 258                                 return last;
 259                 }
 260                 lastc = c;
 261                 last2 = last;
 262                 last = i->first;
 263         }
 264         if (marg < 0)
 265                 return (last + last2)/376*188;
 266         else
 267                 return last;
 268 }
 269
 270 int eMPEGStreamInformation::getNextAccessPoint(pts_t &ts, const pts_t &start, int direction)
 271 {
 272         off_t offset = getAccessPoint(start);
 273         pts_t c1, c2;
 274         std::map<off_t, pts_t>::const_iterator i = m_access_points.find(offset);
 275         if (i == m_access_points.end())
 276         {
 277                 eDebug("getNextAccessPoint: initial AP not found");
 278                 return -1;
 279         }
 280         c1 = i->second - getDelta(i->first);
 281         while (direction)
 282         {
 283                 if (direction > 0)
 284                 {
 285                         if (i == m_access_points.end())
 286                                 return -1;
 287                         ++i;
 288                         c2 = i->second - getDelta(i->first);
 289                         if (c1 == c2) { // Discontinuity
 290                                 ++i;
 291                                 c2 = i->second - getDelta(i->first);
 292                         }
 293                         c1 = c2;
 294                         direction--;
 295                 }
 296                 if (direction < 0)
 297                 {
 298                         if (i == m_access_points.begin())
 299                         {
 300                                 eDebug("at start");
 301                                 return -1;
 302                         }
 303                         --i;
 304                         c2 = i->second - getDelta(i->first);
 305                         if (c1 == c2) { // Discontinuity
 306                                 --i;
 307                                 c2 = i->second - getDelta(i->first);
 308                         }
 309                         c1 = c2;
 310                         direction++;
 311                 }
 312         }
 313         ts = i->second - getDelta(i->first);
 314         eDebug("fine, at %llx - %llx = %llx", ts, i->second, getDelta(i->first));
 315         eDebug("fine, at %lld - %lld = %lld", ts, i->second, getDelta(i->first));
 316         return 0;
 317 }
 318
 319 void eMPEGStreamInformation::writeStructureEntry(off_t offset, structure_data data)
 320 {
 321         unsigned long long d[2];
 322 #if BYTE_ORDER == BIG_ENDIAN
 323         d[0] = offset;
 324         d[1] = data;
 325 #else
 326         d[0] = bswap_64(offset);
 327         d[1] = bswap_64(data);
 328 #endif
 329         if (m_structure_write)
 330                 fwrite(d, sizeof(d), 1, m_structure_write);
 331 }
 332
 333 int eMPEGStreamInformation::getStructureEntry(off_t &offset, unsigned long long &data, int get_next)
 334 {
 335         if (!m_structure_read)
 336         {
 337                 eDebug("getStructureEntry failed because of no m_structure_read");
 338                 return -1;
 339         }
 340
 341         off_t _offset = offset;
 342         const int struture_cache_size = sizeof(m_structure_cache) / 16;
 343         if ((m_structure_cache_entries == 0) || ((off_t)m_structure_cache[0] > offset) || ((off_t)m_structure_cache[(m_structure_cache_entries - (get_next ? 2 : 1)) * 2] <= offset))
 344         {
 345                 if(update_structure_cache_entries(_offset))
 346                 {
 347                         return -1;
 348                 }
 349         }
 350
 351         int i = 0;
 352         while ((off_t)m_structure_cache[i * 2] <= offset)
 353         {
 354                 ++i;
 355                 if (i == m_structure_cache_entries)
 356                 {
 357                         eDebug("structure data consistency fail!, we are looking for %llx, but last entry is %llx", offset, m_structure_cache[i*2-2]);
 358                         return -1;
 359                 }
 360         }
 361         if (!i)
 362         {
 363                 eDebug("structure data (first entry) consistency fail!");
 364                 return -1;
 365         }
 366
 367         if (!get_next)
 368                 --i;
 369
 370 //      eDebug("[%d] looked for %lld, found %llu=%llx", sizeof offset, offset, m_structure_cache[i * 2], m_structure_cache[i * 2 + 1]);
 371         offset = m_structure_cache[i * 2];
 372         data = m_structure_cache[i * 2 + 1];
 373         return 0;
 374 }
 375
 376 int eMPEGStreamInformation::getStructureEntry_next(off_t &offset, unsigned long long &data)
 377 {
 378         if (!m_structure_read)
 379         {
 380                 eDebug("getStructureEntry failed because of no m_structure_read");
 381                 return -1;
 382         }
 383
 384         off_t _offset = offset;
 385         if ((m_structure_cache_entries == 0) || ((off_t)m_structure_cache[0] > offset) || ((off_t)m_structure_cache[(m_structure_cache_entries - 1)*2] <= offset))
 386         {
 387                 if(update_structure_cache_entries(_offset))
 388                 {
 389                         return -1;
 390                 }
 391         }
 392
 393         int i = 0;
 394         while ((off_t)m_structure_cache[i * 2] <= offset)
 395         {
 396                 ++i;
 397                 if (i == m_structure_cache_entries)
 398                 {
 399                         eDebug("structure data consistency fail!, we are looking for %llu, but last entry is %llu", offset, m_structure_cache[(m_structure_cache_entries-1)*2]);
 400                         return -1;
 401                 }
 402         }
 403         if (!i)
 404         {
 405                 eDebug("structure data (first entry) consistency fail!");
 406                 return -1;
 407         }
 408
 409 //      eDebug("[%d] looked for %llu, found data %llu=%llx",sizeof offset, offset, m_structure_cache[i * 2], m_structure_cache[i * 2 + 1]);
 410         offset = m_structure_cache[i * 2];
 411         data = m_structure_cache[i * 2 + 1];
 412         return 0;
 413 }
 414
 415 int eMPEGStreamInformation::getStructureEntry_prev(off_t &offset, unsigned long long &data)
 416 {
 417         if (!m_structure_read)
 418         {
 419                 eDebug("getStructureEntry failed because of no m_structure_read");
 420                 return -1;
 421         }
 422
 423         off_t _offset = offset;
 424         if ((m_structure_cache_entries == 0) || ((off_t)m_structure_cache[0] >= offset) || ((off_t)m_structure_cache[(m_structure_cache_entries - 1)*2] < offset))
 425         {
 426                 if(update_structure_cache_entries(_offset))
 427                 {
 428                         return -1;
 429                 }
 430         }
 431
 432         int i = m_structure_cache_entries-1;
 433         while ((off_t)m_structure_cache[i * 2] >= offset)
 434         {
 435                 if (i <= 0)
 436                 {
 437                         eDebug("structure data consistency fail!, we are looking for %llu, but last entry is %llu", offset, m_structure_cache[i * 2]);
 438                         return -1;
 439                 }
 440                 --i;
 441         }
 442         if (i == m_structure_cache_entries-1)
 443         {
 444                 eDebug("structure data (first entry) consistency fail!");
 445                 return -1;
 446         }
 447
 448 //      eDebug("[%d] looked for %llu, found data %llu=%llx",sizeof offset, offset, m_structure_cache[i * 2], m_structure_cache[i * 2 + 1]);
 449         offset = m_structure_cache[i * 2];
 450         data = m_structure_cache[i * 2 + 1];
 451         return 0;
 452 }
 453
 454 int eMPEGStreamInformation::update_structure_cache_entries(off_t offset)
 455 {
 456         const int struture_cache_size = sizeof(m_structure_cache) / 16;
 457         fseek(m_structure_read, 0, SEEK_END);
 458         int l = ftell(m_structure_read);
 459         unsigned long long d[2];
 460         const int entry_size = sizeof d;
 461
 462                 /* do a binary search */
 463         int count = l / entry_size;
 464         int i = 0;
 465
 466         while (count)
 467         {
 468                 int step = count >> 1;
 469                 fseek(m_structure_read, (i + step) * entry_size, SEEK_SET);
 470                 if (!fread(d, 1, entry_size, m_structure_read))
 471                 {
 472                         eDebug("read error at entry %d", i);
 473                         return -1;
 474                 }
 475 #if BYTE_ORDER != BIG_ENDIAN
 476                 d[0] = bswap_64(d[0]);
 477                 d[1] = bswap_64(d[1]);
 478 #endif
 479 //              eDebug("%d: %08llx > %llx", i, d[0], d[1]);
 480                 if (d[0] < (unsigned long long)offset)
 481                 {
 482                         i += step + 1;
 483                         count -= step + 1;
 484                 } else
 485                         count = step;
 486         }
 487         eDebug("found %d", i);
 488
 489         /* put that in the middle */
 490         i -= struture_cache_size / 2;
 491         if (i < 0)
 492                 i = 0;
 493         eDebug("cache starts at %d", i);
 494         fseek(m_structure_read, i * entry_size, SEEK_SET);
 495         int num = fread(m_structure_cache, entry_size, struture_cache_size, m_structure_read);
 496         eDebug("%d entries", num);
 497         for (i = 0; i < struture_cache_size; ++i)
 498         {
 499                 if (i < num)
 500                 {
 501 #if BYTE_ORDER != BIG_ENDIAN
 502                         m_structure_cache[i * 2] = bswap_64(m_structure_cache[i * 2]);
 503                         m_structure_cache[i * 2 + 1] = bswap_64(m_structure_cache[i * 2 + 1]);
 504 #endif
 505                 } else
 506                 {
 507                         m_structure_cache[i * 2] = 0x7fffffffffffffffULL; /* fill with harmless content */
 508                         m_structure_cache[i * 2 + 1] = 0x7fffffffffffffffULL;
 509                 }
 510         }
 511         m_structure_cache_entries = num;
 512         return 0;
 513 }
 514
 515 eMPEGStreamParserTS::eMPEGStreamParserTS(eMPEGStreamInformation &streaminfo):
 516         m_streaminfo(streaminfo),
 517         m_pktptr(0),
 518         m_pid(-1),
 519         m_need_next_packet(0),
 520         m_skip(0),
 521         m_last_pts_valid(0),
 522         m_enable_accesspoints(true)
 523 {
 524 }
 525
 526 int eMPEGStreamParserTS::processPacket(const unsigned char *pkt, off_t offset)
 527 {
 528         if (!wantPacket(pkt))
 529                 eWarning("something's wrong.");
 530
 531         const unsigned char *end = pkt + 188, *begin = pkt;
 532
 533         int pusi = !!(pkt[1] & 0x40);
 534
 535         if (!(pkt[3] & 0x10)) /* no payload? */
 536                 return 0;
 537
 538         if (pkt[3] & 0xc0)
 539         {
 540                 /* scrambled stream, we cannot parse pts */
 541                 return 0;
 542         }
 543
 544         if (pkt[3] & 0x20) // adaptation field present?
 545                 pkt += pkt[4] + 4 + 1;  /* skip adaptation field and header */
 546         else
 547                 pkt += 4; /* skip header */
 548
 549         if (pkt > end)
 550         {
 551                 eWarning("[TSPARSE] dropping huge adaption field");
 552                 return 0;
 553         }
 554
 555         pts_t pts = 0;
 556         int ptsvalid = 0;
 557
 558         if (pusi)
 559         {
 560                         // ok, we now have the start of the payload, aligned with the PES packet start.
 561                 if (pkt[0] || pkt[1] || (pkt[2] != 1))
 562                 {
 563                         eWarning("broken startcode");
 564                         return 0;
 565                 }
 566
 567                 if (pkt[7] & 0x80) // PTS present?
 568                 {
 569                         pts  = ((unsigned long long)(pkt[ 9]&0xE))  << 29;
 570                         pts |= ((unsigned long long)(pkt[10]&0xFF)) << 22;
 571                         pts |= ((unsigned long long)(pkt[11]&0xFE)) << 14;
 572                         pts |= ((unsigned long long)(pkt[12]&0xFF)) << 7;
 573                         pts |= ((unsigned long long)(pkt[13]&0xFE)) >> 1;
 574                         ptsvalid = 1;
 575
 576                         m_last_pts = pts;
 577                         m_last_pts_valid = 1;
 578
 579         #if 0
 580                         int sec = pts / 90000;
 581                         int frm = pts % 90000;
 582                         int min = sec / 60;
 583                         sec %= 60;
 584                         int hr = min / 60;
 585                         min %= 60;
 586                         int d = hr / 24;
 587                         hr %= 24;
 588
 589                         eDebug("pts: %016llx %d:%02d:%02d:%02d:%05d", pts, d, hr, min, sec, frm);
 590         #endif
 591                 }
 592
 593                         /* advance to payload */
 594                 pkt += pkt[8] + 9;
 595         }
 596
 597         while (pkt < (end-4))
 598         {
 599                 int pkt_offset = pkt - begin;
 600                 if (!(pkt[0] || pkt[1] || (pkt[2] != 1)))
 601                 {
 602 //                      eDebug("SC %02x %02x %02x %02x, %02x", pkt[0], pkt[1], pkt[2], pkt[3], pkt[4]);
 603                         int sc = pkt[3];
 604
 605                         if (m_streamtype == 0) /* mpeg2 */
 606                         {
 607                                 if ((sc == 0x00) || (sc == 0xb3) || (sc == 0xb8)) /* picture, sequence, group start code */
 608                                 {
 609                                         unsigned long long data = sc | (pkt[4] << 8) | (pkt[5] << 16) | (pkt[6] << 24);
 610                                         m_streaminfo.writeStructureEntry(offset + pkt_offset, data  & 0xFFFFFFFFULL);
 611                                 }
 612                                 if (m_enable_accesspoints)
 613                                 {
 614                                         if (pkt[3] == 0xb3) /* sequence header */
 615                                         {
 616                                                 if (ptsvalid)
 617                                                 {
 618                                                         m_streaminfo.m_access_points[offset] = pts;
 619                 //                                      eDebug("Sequence header at %llx, pts %llx", offset, pts);
 620                                                 } else
 621                                                         /*eDebug("Sequence header but no valid PTS value.")*/;
 622                                         }
 623                                 }
 624                         }
 625
 626                         if (m_streamtype == 1) /* H.264 */
 627                         {
 628                                 if (sc == 0x09)
 629                                 {
 630                                                 /* store image type */
 631                                         unsigned long long data = sc | (pkt[4] << 8);
 632                                         m_streaminfo.writeStructureEntry(offset + pkt_offset, data);
 633                                 }
 634                                 if (m_enable_accesspoints)
 635                                 {
 636                                         if (pkt[3] == 0x09 &&   /* MPEG4 AVC NAL unit access delimiter */
 637                                                  (pkt[4] >> 5) == 0) /* and I-frame */
 638                                         {
 639                                                 if (ptsvalid)
 640                                                 {
 641                                                         m_streaminfo.m_access_points[offset] = pts;
 642                 //                              eDebug("MPEG4 AVC UAD at %llx, pts %llx", offset, pts);
 643                                                 } else
 644                                                         /*eDebug("MPEG4 AVC UAD but no valid PTS value.")*/;
 645                                         }
 646                                 }
 647                         }
 648                         if (m_streamtype == 6) /* H.265 */
 649                         {
 650                                 int nal_unit_type = (sc >> 1);
 651                                 if (nal_unit_type == 35) /* H265 NAL unit access delimiter */
 652                                 {
 653                                         unsigned long long data = sc | (pkt[5] << 8);
 654                                         m_streaminfo.writeStructureEntry(offset + pkt_offset, data);
 655
 656                                         if (m_enable_accesspoints)
 657                                         {
 658                                                 if ((pkt[5] >> 5) == 0) /* check pic_type for I-frame */
 659                                                 {
 660                                                         if (ptsvalid)
 661                                                         {
 662                                                                 m_streaminfo.m_access_points[offset] = pts;
 663                                                         }
 664                                                 }
 665                                         }
 666                                 }
 667                         }
 668                 }
 669                 ++pkt;
 670         }
 671         return 0;
 672 }
 673
 674 inline int eMPEGStreamParserTS::wantPacket(const unsigned char *hdr) const
 675 {
 676         if (hdr[0] != 0x47)
 677         {
 678                 eDebug("missing sync!");
 679                 return 0;
 680         }
 681         int ppid = ((hdr[1]&0x1F) << 8) | hdr[2];
 682
 683         if (ppid != m_pid)
 684                 return 0;
 685
 686         if (m_need_next_packet)  /* next packet (on this pid) was required? */
 687                 return 1;
 688
 689         if (hdr[1] & 0x40)       /* pusi set: yes. */
 690                 return 1;
 691
 692         return m_streamtype == 0; /* we need all packets for MPEG2, but only PUSI packets for H.264 */
 693 }
 694
 695 void eMPEGStreamParserTS::parseData(off_t offset, const void *data, unsigned int len)
 696 {
 697         const unsigned char *packet = (const unsigned char*)data;
 698         const unsigned char *packet_start = packet;
 699
 700                         /* sorry for the redundant code here, but there are too many special cases... */
 701         while (len)
 702         {
 703                         /* emergency resync. usually, this should not happen, because the data should
 704                            be sync-aligned.
 705
 706                            to make this code work for non-strictly-sync-aligned data, (for example, bad
 707                            files) we fix a possible resync here by skipping data until the next 0x47.
 708
 709                            if this is a false 0x47, the packet will be dropped by wantPacket, and the
 710                            next time, sync will be re-established. */
 711                 int skipped = 0;
 712                 while (!m_pktptr && len)
 713                 {
 714                         if (packet[0] == 0x47)
 715                                 break;
 716                         len--;
 717                         packet++;
 718                         skipped++;
 719                 }
 720
 721                 if (skipped)
 722                         eDebug("SYNC LOST: skipped %d bytes.", skipped);
 723
 724                 if (!len)
 725                         break;
 726
 727                 if (m_pktptr)
 728                 {
 729                                 /* skip last packet */
 730                         if (m_pktptr < 0)
 731                         {
 732                                 unsigned int skiplen = -m_pktptr;
 733                                 if (skiplen > len)
 734                                         skiplen = len;
 735                                 packet += skiplen;
 736                                 len -= skiplen;
 737                                 m_pktptr += skiplen;
 738                                 continue;
 739                         } else if (m_pktptr < 4) /* header not complete, thus we don't know if we want this packet */
 740                         {
 741                                 unsigned int storelen = 4 - m_pktptr;
 742                                 if (storelen > len)
 743                                         storelen = len;
 744                                 memcpy(m_pkt + m_pktptr, packet,  storelen);
 745
 746                                 m_pktptr += storelen;
 747                                 len -= storelen;
 748                                 packet += storelen;
 749
 750                                 if (m_pktptr == 4)
 751                                         if (!wantPacket(m_pkt))
 752                                         {
 753                                                         /* skip packet */
 754                                                 packet += 184;
 755                                                 len -= 184;
 756                                                 m_pktptr = 0;
 757                                                 continue;
 758                                         }
 759                         }
 760                                 /* otherwise we complete up to the full packet */
 761                         unsigned int storelen = 188 - m_pktptr;
 762                         if (storelen > len)
 763                                 storelen = len;
 764                         memcpy(m_pkt + m_pktptr, packet,  storelen);
 765                         m_pktptr += storelen;
 766                         len -= storelen;
 767                         packet += storelen;
 768
 769                         if (m_pktptr == 188)
 770                         {
 771                                 m_need_next_packet = processPacket(m_pkt, offset + (packet - packet_start));
 772                                 m_pktptr = 0;
 773                         }
 774                 } else if (len >= 4)  /* if we have a full header... */
 775                 {
 776                         if (wantPacket(packet))  /* decide wheter we need it ... */
 777                         {
 778                                 if (len >= 188)          /* packet complete? */
 779                                 {
 780                                         m_need_next_packet = processPacket(packet, offset + (packet - packet_start)); /* process it now. */
 781                                 } else
 782                                 {
 783                                         memcpy(m_pkt, packet, len);  /* otherwise queue it up */
 784                                         m_pktptr = len;
 785                                 }
 786                         }
 787
 788                                 /* skip packet */
 789                         int sk = len;
 790                         if (sk >= 188)
 791                                 sk = 188;
 792                         else if (!m_pktptr) /* we dont want this packet, otherwise m_pktptr = sk (=len) > 4 */
 793                                 m_pktptr = sk - 188;
 794
 795                         len -= sk;
 796                         packet += sk;
 797                 } else             /* if we don't have a complete header */
 798                 {
 799                         memcpy(m_pkt, packet, len);   /* complete header next time */
 800                         m_pktptr = len;
 801                         packet += len;
 802                         len = 0;
 803                 }
 804         }
 805 }
 806
 807 void eMPEGStreamParserTS::setPid(int _pid, int type)
 808 {
 809         m_pktptr = 0;
 810         m_pid = _pid;
 811         m_streamtype = type;
 812 }
 813
 814 int eMPEGStreamParserTS::getLastPTS(pts_t &last_pts)
 815 {
 816         if (!m_last_pts_valid)
 817         {
 818                 last_pts = 0;
 819                 return -1;
 820         }
 821         last_pts = m_last_pts;
 822         return 0;
 823 }
 824