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_valid(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         if (m_filename == "")
  37                 return -1;
  38         FILE *f = fopen((m_filename + ".ap").c_str(), "wb");
  39         if (!f)
  40                 return -1;
  41
  42         for (std::map<off_t, pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
  43         {
  44                 unsigned long long d[2];
  45 #if BYTE_ORDER == BIG_ENDIAN
  46                 d[0] = i->first;
  47                 d[1] = i->second;
  48 #else
  49                 d[0] = bswap_64(i->first);
  50                 d[1] = bswap_64(i->second);
  51 #endif
  52                 fwrite(d, sizeof(d), 1, f);
  53         }
  54         fclose(f);
  55
  56         return 0;
  57 }
  58
  59 int eMPEGStreamInformation::load(const char *filename)
  60 {
  61         m_filename = filename;
  62         if (m_structure_read)
  63                 fclose(m_structure_read);
  64         m_structure_read = fopen((std::string(m_filename) + ".sc").c_str(), "rb");
  65         FILE *f = fopen((std::string(m_filename) + ".ap").c_str(), "rb");
  66         if (!f)
  67                 return -1;
  68         m_access_points.clear();
  69         m_pts_to_offset.clear();
  70         while (1)
  71         {
  72                 unsigned long long d[2];
  73                 if (fread(d, sizeof(d), 1, f) < 1)
  74                         break;
  75
  76 #if BYTE_ORDER == LITTLE_ENDIAN
  77                 d[0] = bswap_64(d[0]);
  78                 d[1] = bswap_64(d[1]);
  79 #endif
  80                 m_access_points[d[0]] = d[1];
  81                 m_pts_to_offset.insert(std::pair<pts_t,off_t>(d[1], d[0]));
  82         }
  83         fclose(f);
  84         fixupDiscontinuties();
  85         return 0;
  86 }
  87
  88 bool eMPEGStreamInformation::empty()
  89 {
  90         return m_access_points.empty();
  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*5)) // 5sec 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         for (std::map<off_t, pts_t>::const_iterator i(m_access_points.begin()); i != m_access_points.end(); ++i)
 248         {
 249                 pts_t delta = getDelta(i->first);
 250                 pts_t c = i->second - delta;
 251                 if (c > ts) {
 252                         if (marg > 0)
 253                                 return (last + i->first)/376*188;
 254                         else if (marg < 0)
 255                                 return (last + last2)/376*188;
 256                         else
 257                                 return last;
 258                 }
 259                 lastc = c;
 260                 last2 = last;
 261                 last = i->first;
 262         }
 263         if (marg < 0)
 264                 return (last + last2)/376*188;
 265         else
 266                 return last;
 267 }
 268
 269 int eMPEGStreamInformation::getNextAccessPoint(pts_t &ts, const pts_t &start, int direction)
 270 {
 271         off_t offset = getAccessPoint(start);
 272         pts_t c1, c2;
 273         std::map<off_t, pts_t>::const_iterator i = m_access_points.find(offset);
 274         if (i == m_access_points.end())
 275         {
 276                 eDebug("getNextAccessPoint: initial AP not found");
 277                 return -1;
 278         }
 279         c1 = i->second - getDelta(i->first);
 280         while (direction)
 281         {
 282                 if (direction > 0)
 283                 {
 284                         if (i == m_access_points.end())
 285                                 return -1;
 286                         ++i;
 287                         c2 = i->second - getDelta(i->first);
 288                         if (c1 == c2) { // Discontinuity
 289                                 ++i;
 290                                 c2 = i->second - getDelta(i->first);
 291                         }
 292                         c1 = c2;
 293                         direction--;
 294                 }
 295                 if (direction < 0)
 296                 {
 297                         if (i == m_access_points.begin())
 298                         {
 299                                 eDebug("at start");
 300                                 return -1;
 301                         }
 302                         --i;
 303                         c2 = i->second - getDelta(i->first);
 304                         if (c1 == c2) { // Discontinuity
 305                                 --i;
 306                                 c2 = i->second - getDelta(i->first);
 307                         }
 308                         c1 = c2;
 309                         direction++;
 310                 }
 311         }
 312         ts = i->second - getDelta(i->first);
 313         eDebug("fine, at %llx - %llx = %llx", ts, i->second, getDelta(i->first));
 314         eDebug("fine, at %lld - %lld = %lld", ts, i->second, getDelta(i->first));
 315         return 0;
 316 }
 317
 318 void eMPEGStreamInformation::writeStructureEntry(off_t offset, structure_data data)
 319 {
 320         unsigned long long d[2];
 321 #if BYTE_ORDER == BIG_ENDIAN
 322         d[0] = offset;
 323         d[1] = data;
 324 #else
 325         d[0] = bswap_64(offset);
 326         d[1] = bswap_64(data);
 327 #endif
 328         if (m_structure_write)
 329                 fwrite(d, sizeof(d), 1, m_structure_write);
 330 }
 331
 332 int eMPEGStreamInformation::getStructureEntry(off_t &offset, unsigned long long &data, int get_next)
 333 {
 334         if (!m_structure_read)
 335         {
 336                 eDebug("getStructureEntry failed because of no m_structure_read");
 337                 return -1;
 338         }
 339
 340         const int struture_cache_entries = sizeof(m_structure_cache) / 16;
 341         if ((!m_structure_cache_valid) || ((off_t)m_structure_cache[0] > offset) || ((off_t)m_structure_cache[(struture_cache_entries - (get_next ? 2 : 1)) * 2] <= offset))
 342         {
 343                 fseek(m_structure_read, 0, SEEK_END);
 344                 int l = ftell(m_structure_read);
 345                 unsigned long long d[2];
 346                 const int entry_size = sizeof d;
 347
 348                         /* do a binary search */
 349                 int count = l / entry_size;
 350                 int i = 0;
 351
 352                 while (count)
 353                 {
 354                         int step = count >> 1;
 355
 356                         fseek(m_structure_read, (i + step) * entry_size, SEEK_SET);
 357                         if (!fread(d, 1, entry_size, m_structure_read))
 358                         {
 359                                 eDebug("read error at entry %d", i);
 360                                 return -1;
 361                         }
 362
 363 #if BYTE_ORDER != BIG_ENDIAN
 364                         d[0] = bswap_64(d[0]);
 365                         d[1] = bswap_64(d[1]);
 366 #endif
 367 //                      eDebug("%d: %08llx > %llx", i, d[0], d[1]);
 368
 369                         if (d[0] < (unsigned long long)offset)
 370                         {
 371                                 i += step + 1;
 372                                 count -= step + 1;
 373                         } else
 374                                 count = step;
 375                 }
 376
 377                 eDebug("found %d", i);
 378
 379                         /* put that in the middle */
 380                 i -= struture_cache_entries / 2;
 381                 if (i < 0)
 382                         i = 0;
 383                 eDebug("cache starts at %d", i);
 384                 fseek(m_structure_read, i * entry_size, SEEK_SET);
 385                 int num = fread(m_structure_cache, entry_size, struture_cache_entries, m_structure_read);
 386                 eDebug("%d entries", num);
 387                 for (i = 0; i < struture_cache_entries; ++i)
 388                 {
 389                         if (i < num)
 390                         {
 391 #if BYTE_ORDER != BIG_ENDIAN
 392                                 m_structure_cache[i * 2] = bswap_64(m_structure_cache[i * 2]);
 393                                 m_structure_cache[i * 2 + 1] = bswap_64(m_structure_cache[i * 2 + 1]);
 394 #endif
 395                         } else
 396                         {
 397                                 m_structure_cache[i * 2] = 0x7fffffffffffffffULL; /* fill with harmless content */
 398                                 m_structure_cache[i * 2 + 1] = 0;
 399                         }
 400                 }
 401                 m_structure_cache_valid = 1;
 402         }
 403
 404         int i = 0;
 405         while ((off_t)m_structure_cache[i * 2] <= offset)
 406         {
 407                 ++i;
 408                 if (i == struture_cache_entries)
 409                 {
 410                         eDebug("structure data consistency fail!, we are looking for %llx, but last entry is %llx", offset, m_structure_cache[i*2-2]);
 411                         return -1;
 412                 }
 413         }
 414         if (!i)
 415         {
 416                 eDebug("structure data (first entry) consistency fail!");
 417                 return -1;
 418         }
 419
 420         if (!get_next)
 421                 --i;
 422
 423 //      eDebug("[%d] looked for %llx, found %llx=%llx", sizeof offset, offset, m_structure_cache[i * 2], m_structure_cache[i * 2 + 1]);
 424         offset = m_structure_cache[i * 2];
 425         data = m_structure_cache[i * 2 + 1];
 426         return 0;
 427 }
 428
 429 eMPEGStreamParserTS::eMPEGStreamParserTS(eMPEGStreamInformation &streaminfo): m_streaminfo(streaminfo), m_pktptr(0), m_pid(-1), m_need_next_packet(0), m_skip(0), m_last_pts_valid(0)
 430 {
 431 }
 432
 433 int eMPEGStreamParserTS::processPacket(const unsigned char *pkt, off_t offset)
 434 {
 435         if (!wantPacket(pkt))
 436                 eWarning("something's wrong.");
 437
 438         const unsigned char *end = pkt + 188, *begin = pkt;
 439
 440         int pusi = !!(pkt[1] & 0x40);
 441
 442         if (!(pkt[3] & 0x10)) /* no payload? */
 443                 return 0;
 444
 445         if (pkt[3] & 0x20) // adaptation field present?
 446                 pkt += pkt[4] + 4 + 1;  /* skip adaptation field and header */
 447         else
 448                 pkt += 4; /* skip header */
 449
 450         if (pkt > end)
 451         {
 452                 eWarning("[TSPARSE] dropping huge adaption field");
 453                 return 0;
 454         }
 455
 456         pts_t pts = 0;
 457         int ptsvalid = 0;
 458
 459         if (pusi)
 460         {
 461                         // ok, we now have the start of the payload, aligned with the PES packet start.
 462                 if (pkt[0] || pkt[1] || (pkt[2] != 1))
 463                 {
 464                         eWarning("broken startcode");
 465                         return 0;
 466                 }
 467
 468                 if (pkt[7] & 0x80) // PTS present?
 469                 {
 470                         pts  = ((unsigned long long)(pkt[ 9]&0xE))  << 29;
 471                         pts |= ((unsigned long long)(pkt[10]&0xFF)) << 22;
 472                         pts |= ((unsigned long long)(pkt[11]&0xFE)) << 14;
 473                         pts |= ((unsigned long long)(pkt[12]&0xFF)) << 7;
 474                         pts |= ((unsigned long long)(pkt[13]&0xFE)) >> 1;
 475                         ptsvalid = 1;
 476
 477                         m_last_pts = pts;
 478                         m_last_pts_valid = 1;
 479
 480         #if 0
 481                         int sec = pts / 90000;
 482                         int frm = pts % 90000;
 483                         int min = sec / 60;
 484                         sec %= 60;
 485                         int hr = min / 60;
 486                         min %= 60;
 487                         int d = hr / 24;
 488                         hr %= 24;
 489
 490                         eDebug("pts: %016llx %d:%02d:%02d:%02d:%05d", pts, d, hr, min, sec, frm);
 491         #endif
 492                 }
 493
 494                         /* advance to payload */
 495                 pkt += pkt[8] + 9;
 496         }
 497
 498         while (pkt < (end-4))
 499         {
 500                 int pkt_offset = pkt - begin;
 501                 if (!(pkt[0] || pkt[1] || (pkt[2] != 1)))
 502                 {
 503 //                      eDebug("SC %02x %02x %02x %02x, %02x", pkt[0], pkt[1], pkt[2], pkt[3], pkt[4]);
 504                         int sc = pkt[3];
 505
 506                         if (m_streamtype == 0) /* mpeg2 */
 507                         {
 508                                 if ((sc == 0x00) || (sc == 0xb3) || (sc == 0xb8)) /* picture, sequence, group start code */
 509                                 {
 510                                         unsigned long long data = sc | (pkt[4] << 8) | (pkt[5] << 16) | (pkt[6] << 24);
 511                                         m_streaminfo.writeStructureEntry(offset + pkt_offset, data  & 0xFFFFFFFFULL);
 512                                 }
 513                                 if (pkt[3] == 0xb3) /* sequence header */
 514                                 {
 515                                         if (ptsvalid)
 516                                         {
 517                                                 m_streaminfo.m_access_points[offset] = pts;
 518         //                                      eDebug("Sequence header at %llx, pts %llx", offset, pts);
 519                                         } else
 520                                                 /*eDebug("Sequence header but no valid PTS value.")*/;
 521                                 }
 522                         }
 523
 524                         if (m_streamtype == 1) /* H.264 */
 525                         {
 526                                 if (sc == 0x09)
 527                                 {
 528                                                 /* store image type */
 529                                         unsigned long long data = sc | (pkt[4] << 8);
 530                                         m_streaminfo.writeStructureEntry(offset + pkt_offset, data);
 531                                 }
 532                                 if (pkt[3] == 0x09 &&   /* MPEG4 AVC NAL unit access delimiter */
 533                                          (pkt[4] >> 5) == 0) /* and I-frame */
 534                                 {
 535                                         if (ptsvalid)
 536                                         {
 537                                                 m_streaminfo.m_access_points[offset] = pts;
 538         //                              eDebug("MPEG4 AVC UAD at %llx, pts %llx", offset, pts);
 539                                         } else
 540                                                 /*eDebug("MPEG4 AVC UAD but no valid PTS value.")*/;
 541                                 }
 542                         }
 543                 }
 544                 ++pkt;
 545         }
 546         return 0;
 547 }
 548
 549 inline int eMPEGStreamParserTS::wantPacket(const unsigned char *hdr) const
 550 {
 551         if (hdr[0] != 0x47)
 552         {
 553                 eDebug("missing sync!");
 554                 return 0;
 555         }
 556         int ppid = ((hdr[1]&0x1F) << 8) | hdr[2];
 557
 558         if (ppid != m_pid)
 559                 return 0;
 560
 561         if (m_need_next_packet)  /* next packet (on this pid) was required? */
 562                 return 1;
 563
 564         if (hdr[1] & 0x40)       /* pusi set: yes. */
 565                 return 1;
 566
 567         return m_streamtype == 0; /* we need all packets for MPEG2, but only PUSI packets for H.264 */
 568 }
 569
 570 void eMPEGStreamParserTS::parseData(off_t offset, const void *data, unsigned int len)
 571 {
 572         const unsigned char *packet = (const unsigned char*)data;
 573         const unsigned char *packet_start = packet;
 574
 575                         /* sorry for the redundant code here, but there are too many special cases... */
 576         while (len)
 577         {
 578                         /* emergency resync. usually, this should not happen, because the data should
 579                            be sync-aligned.
 580
 581                            to make this code work for non-strictly-sync-aligned data, (for example, bad
 582                            files) we fix a possible resync here by skipping data until the next 0x47.
 583
 584                            if this is a false 0x47, the packet will be dropped by wantPacket, and the
 585                            next time, sync will be re-established. */
 586                 int skipped = 0;
 587                 while (!m_pktptr && len)
 588                 {
 589                         if (packet[0] == 0x47)
 590                                 break;
 591                         len--;
 592                         packet++;
 593                         skipped++;
 594                 }
 595
 596                 if (skipped)
 597                         eDebug("SYNC LOST: skipped %d bytes.", skipped);
 598
 599                 if (!len)
 600                         break;
 601
 602                 if (m_pktptr)
 603                 {
 604                                 /* skip last packet */
 605                         if (m_pktptr < 0)
 606                         {
 607                                 unsigned int skiplen = -m_pktptr;
 608                                 if (skiplen > len)
 609                                         skiplen = len;
 610                                 packet += skiplen;
 611                                 len -= skiplen;
 612                                 m_pktptr += skiplen;
 613                                 continue;
 614                         } else if (m_pktptr < 4) /* header not complete, thus we don't know if we want this packet */
 615                         {
 616                                 unsigned int storelen = 4 - m_pktptr;
 617                                 if (storelen > len)
 618                                         storelen = len;
 619                                 memcpy(m_pkt + m_pktptr, packet,  storelen);
 620
 621                                 m_pktptr += storelen;
 622                                 len -= storelen;
 623                                 packet += storelen;
 624
 625                                 if (m_pktptr == 4)
 626                                         if (!wantPacket(m_pkt))
 627                                         {
 628                                                         /* skip packet */
 629                                                 packet += 184;
 630                                                 len -= 184;
 631                                                 m_pktptr = 0;
 632                                                 continue;
 633                                         }
 634                         }
 635                                 /* otherwise we complete up to the full packet */
 636                         unsigned int storelen = 188 - m_pktptr;
 637                         if (storelen > len)
 638                                 storelen = len;
 639                         memcpy(m_pkt + m_pktptr, packet,  storelen);
 640                         m_pktptr += storelen;
 641                         len -= storelen;
 642                         packet += storelen;
 643
 644                         if (m_pktptr == 188)
 645                         {
 646                                 m_need_next_packet = processPacket(m_pkt, offset + (packet - packet_start));
 647                                 m_pktptr = 0;
 648                         }
 649                 } else if (len >= 4)  /* if we have a full header... */
 650                 {
 651                         if (wantPacket(packet))  /* decide wheter we need it ... */
 652                         {
 653                                 if (len >= 188)          /* packet complete? */
 654                                 {
 655                                         m_need_next_packet = processPacket(packet, offset + (packet - packet_start)); /* process it now. */
 656                                 } else
 657                                 {
 658                                         memcpy(m_pkt, packet, len);  /* otherwise queue it up */
 659                                         m_pktptr = len;
 660                                 }
 661                         }
 662
 663                                 /* skip packet */
 664                         int sk = len;
 665                         if (sk >= 188)
 666                                 sk = 188;
 667                         else if (!m_pktptr) /* we dont want this packet, otherwise m_pktptr = sk (=len) > 4 */
 668                                 m_pktptr = sk - 188;
 669
 670                         len -= sk;
 671                         packet += sk;
 672                 } else             /* if we don't have a complete header */
 673                 {
 674                         memcpy(m_pkt, packet, len);   /* complete header next time */
 675                         m_pktptr = len;
 676                         packet += len;
 677                         len = 0;
 678                 }
 679         }
 680 }
 681
 682 void eMPEGStreamParserTS::setPid(int _pid, int type)
 683 {
 684         m_pktptr = 0;
 685         m_pid = _pid;
 686         m_streamtype = type;
 687 }
 688
 689 int eMPEGStreamParserTS::getLastPTS(pts_t &last_pts)
 690 {
 691         if (!m_last_pts_valid)
 692         {
 693                 last_pts = 0;
 694                 return -1;
 695         }
 696         last_pts = m_last_pts;
 697         return 0;
 698 }
 699