demuxer.cc

   1 /*
   2     Copyright 2005-2008 Mark Calderbank
   3     Copyright 2007 Marten Richter (AC3 support)
   4
   5     This file is part of VOMP.
   6
   7     VOMP is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     VOMP is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with VOMP; if not, write to the Free Software Foundation, Inc.,
  19     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20 */
  21
  22 #include "demuxer.h"
  23
  24 #include "callback.h"
  25 #include "dvbsubtitles.h"
  26 #include "log.h"
  27
  28 #include <cstdlib>
  29
  30 #include <math.h>
  31
  32 #define DEMUXER_SEQ_HEAD 0x000001B3
  33 #define DEMUXER_PIC_HEAD 0x00000101
  34 #define DEMUXER_SEQ_EXT_HEAD 0x000001B5
  35
  36 #define DEMUXER_H264_ACCESS_UNIT 0x00000109
  37 #define DEMUXER_H264_SEQ_PARAMETER_SET 0x00000107
  38 #define DEMUXER_H264_SUB_ENHANCEMENT_INF 0x00000106
  39
  40
  41 #define SEEK_THRESHOLD 150000 // About 1.5 seconds
  42
  43 // Statics
  44 const int Demuxer::FrameRates[9] = { 0, 23, 24, 25, 29, 30, 50, 59, 60 };
  45 Demuxer* Demuxer::instance = NULL;
  46
  47 class NALUUnit {
  48 public:
  49     NALUUnit(const UCHAR* buf,UINT length_buf);
  50     ~NALUUnit();
  51
  52 inline    UINT getBits(UINT num_bits);
  53     UINT getUe();
  54     int getSe();
  55     bool isEonalu() {return eonalu;};
  56
  57 protected:
  58     UCHAR* nalu_buf;
  59     UINT nalu_length;
  60     UINT pos;
  61     UCHAR bit_pos;
  62     UCHAR working_byte;
  63     UINT last_bytes;
  64     bool eonalu;
  65 };
  66
  67 NALUUnit::NALUUnit(const UCHAR *buf, UINT length_buf)
  68 {
  69     nalu_length=0;
  70     nalu_buf=NULL;
  71     pos=0;
  72     bit_pos=0;
  73     working_byte=0;
  74     last_bytes=0;
  75     eonalu=false;
  76
  77     UINT nalu_start=0;
  78     UINT nalu_end=0;
  79     UINT pattern =(((UINT)buf[ 0] << 16) |
  80                    ((UINT)buf[1] <<  8) |
  81                     (UINT)buf[2]  );
  82     nalu_start=3;
  83     while (pattern != 0x000001)
  84     {
  85         if (++nalu_start >= length_buf) return;
  86         pattern = ((pattern << 8) | buf[nalu_start])&0x00FFFFFF;
  87     }
  88     nalu_end=nalu_start+1;
  89     pattern = ((pattern << 8) | buf[nalu_end])&0x00FFFFFF;
  90
  91     while (pattern != 0x000001 && pattern != 0x000000)
  92     {
  93         if (++nalu_end >= length_buf) { nalu_end+=3;break;};
  94         pattern = ((pattern << 8) | buf[nalu_end])&0x00FFFFFF;
  95     }
  96     nalu_end-=3;
  97     nalu_end=min(length_buf-1,nalu_end);
  98     nalu_length=nalu_end-nalu_start;
  99     nalu_buf=(UCHAR*)malloc(nalu_length);
 100     memcpy(nalu_buf,buf+nalu_start,nalu_length);
 101     pos=1;
 102 }
 103
 104 NALUUnit::~NALUUnit()
 105 {
 106     if (nalu_buf) free(nalu_buf);
 107 }
 108
 109 inline UINT NALUUnit::getBits(UINT num_bits)
 110 {
 111     if (num_bits==0) return 0; //???
 112     UINT remain_bits=num_bits;
 113     UINT work=0;
 114     //May be slow, but should work!
 115     while (remain_bits>0) {
 116         if (bit_pos==0) {
 117             if (pos<nalu_length)
 118             {
 119                 last_bytes=(last_bytes<<8) & nalu_buf[pos];
 120                 if ((last_bytes & 0x00FFFFFF) == 0x000003) pos++; //emulation prevention byte
 121                  if (pos<nalu_length)
 122                  {
 123                      working_byte=nalu_buf[pos];
 124                      pos++;
 125                  }
 126                  else
 127                  {
 128                      working_byte=0;
 129                      eonalu=true;
 130                  }
 131             }
 132             else
 133             {
 134                 working_byte=0;
 135                 eonalu=true;
 136             }
 137
 138         }
 139         UINT fetch_bits=min(remain_bits,8-bit_pos);
 140         work=work <<fetch_bits;
 141         //work|=((working_byte>>bit_pos) & (0xFF>>(8-fetch_bits)));
 142         work|=(working_byte &(0xFF>>(bit_pos)))>>(8-fetch_bits-bit_pos);
 143         remain_bits-=fetch_bits;
 144         bit_pos=(bit_pos+fetch_bits)%8;
 145     }
 146     return work;
 147 }
 148
 149 UINT NALUUnit::getUe()
 150 {
 151     int leadbits=-1;
 152     bool bit;
 153     for( bit = 0; !bit && !eonalu; leadbits++ )
 154         bit = getBits(1);
 155     if (eonalu) return true;
 156     return ((1 << leadbits)-1)+getBits(leadbits);
 157 }
 158
 159 int NALUUnit::getSe()
 160 {
 161     UINT input=getUe();
 162     if (input==0) return 0;
 163     int output=((input+1)>>1);
 164     if (input & 0x1) output*=-1;
 165     return output;
 166 }
 167
 168
 169
 170 static const int PESPacket_initial_size = 2000;
 171
 172 // PESPacket methods
 173 PESPacket::PESPacket()
 174 {
 175   data_size = PESPacket_initial_size;
 176   data = (UCHAR*)malloc(data_size);
 177   data[0] = 0x00;
 178   data[1] = 0x00;
 179   data[2] = 0x01;
 180   init(0);
 181 }
 182
 183 PESPacket::PESPacket(const PESPacket& packet)
 184 {
 185   copyFrom(packet);
 186 }
 187
 188 PESPacket& PESPacket::operator=(const PESPacket& packet)
 189 {
 190   if (this != &packet)
 191   {
 192     if (data) free(data);
 193     copyFrom(packet);
 194   }
 195   return *this;
 196 }
 197
 198 PESPacket::~PESPacket()
 199 {
 200   if (data) free(data);
 201 }
 202
 203 void PESPacket::copyFrom(const PESPacket& packet)
 204 {
 205   length = packet.length;
 206   size = packet.size;
 207   packetType = packet.packetType;
 208   substream = packet.substream;
 209   seq_header = packet.seq_header;
 210   data_size = size;
 211   data = (UCHAR*)malloc(data_size);
 212   memcpy(data, packet.data, data_size);
 213 }
 214
 215 void PESPacket::init(UCHAR type, UCHAR sub)
 216 {
 217   length = 0;
 218   size = 6;
 219   data[4] = data[5] = 0;
 220   data[3] = type;
 221   packetType = type;
 222   substream = sub;
 223   seq_header = 1; // Unknown seq_header status
 224
 225 }
 226
 227 void PESPacket::truncate()
 228 {
 229   init(packetType,substream);
 230 }
 231
 232
 233
 234 int PESPacket::write(const UCHAR *buf, int len)
 235 {
 236
 237
 238   if (size + len > 0x10000) return 0;
 239   if (size + len > data_size)
 240   { // Reallocate
 241     UINT new_data_size = max(data_size + data_size / 2, data_size + len);
 242     if (new_data_size > 0x10000) new_data_size = 0x10000;
 243     data_size = new_data_size;
 244     data = (UCHAR*)realloc(data, data_size);
 245   }
 246   memcpy(data + size, buf, len);
 247   length += len;
 248   size += len;
 249   data[4] = (length >> 8);
 250   data[5] = (length & 0xFF);
 251   // We have added data - reset seq_header indicator if necessary
 252   if (seq_header == 0) seq_header = 1; // Reset to 'unknown'
 253   return 1;
 254 }
 255
 256 ULLONG PESPacket::getPTS() const
 257 {
 258   if ( ( (packetType >= Demuxer::PESTYPE_AUD0 &&
 259           packetType <= Demuxer::PESTYPE_AUDMAX)
 260          ||
 261          (packetType >= Demuxer::PESTYPE_VID0 &&
 262           packetType <= Demuxer::PESTYPE_VIDMAX)
 263    ||
 264           packetType == Demuxer::PESTYPE_PRIVATE_1
 265        )
 266        && size >= 14 && data[7] & 0x80)
 267   {
 268     return ( (ULLONG)(data[ 9] & 0x0E) << 29) |
 269            ( (ULLONG)(data[10])        << 22 ) |
 270            ( (ULLONG)(data[11] & 0xFE) << 14 ) |
 271            ( (ULLONG)(data[12])        <<  7 ) |
 272            ( (ULLONG)(data[13] & 0xFE) >>  1 );
 273   }
 274   else return PTS_INVALID;
 275 }
 276
 277 UCHAR PESPacket::operator[] (UINT index) const
 278 {
 279   if (index >= size)
 280     return 0;
 281   else
 282     return data[index];
 283 }
 284
 285 UINT PESPacket::findPictureHeader(bool h264) const
 286 {
 287   if (size < 12) return 0;
 288   UINT pattern = ( ((UINT)data[ 8] << 24) |
 289                    ((UINT)data[ 9] << 16) |
 290                    ((UINT)data[10] <<  8) |
 291                     (UINT)data[11]  );
 292   UINT pos = 11;
 293   if (h264) {
 294
 295           while (pattern != DEMUXER_H264_ACCESS_UNIT)
 296           {
 297                   if (++pos >= size) return 0;
 298                   pattern = (pattern << 8) | data[pos];
 299           }
 300           return pos-3;
 301   } else {
 302           while (pattern != DEMUXER_PIC_HEAD)
 303           {
 304                   if (++pos >= size) return 0;
 305                   pattern = (pattern << 8) | data[pos];
 306           }
 307           return pos-3;
 308   }
 309 }
 310
 311 UINT PESPacket::countPictureHeaders(bool h264) const
 312 {
 313   if (size < 12) return 0;
 314   UINT pattern = ( ((UINT)data[ 8] << 24) |
 315                    ((UINT)data[ 9] << 16) |
 316                    ((UINT)data[10] <<  8) |
 317                     (UINT)data[11]  );
 318   UINT pos = 11;
 319   UINT count=0;
 320   if (h264) {
 321
 322           while (pos<size)
 323           {
 324           pos++;
 325                   pattern = (pattern << 8) | data[pos];
 326           if (pattern==DEMUXER_H264_ACCESS_UNIT) count++;
 327           }
 328           return count;
 329   } else {
 330       while (pos<size)
 331           {
 332           pos++;
 333                   pattern = (pattern << 8) | data[pos];
 334           if (pattern==DEMUXER_PIC_HEAD) count++;
 335           }
 336           return count;
 337   }
 338 }
 339
 340 UINT PESPacket::findSeqHeader(bool h264) const
 341 {
 342   if (seq_header != 1) return seq_header;
 343   if (size < 12) return 0;
 344   UINT pattern = ( ((UINT)data[ 8] << 24) |
 345                    ((UINT)data[ 9] << 16) |
 346                    ((UINT)data[10] <<  8) |
 347                     (UINT)data[11]  );
 348   UINT pos = 11;
 349   if (h264) {
 350       while ((pattern & 0xFFFFFF1F) != DEMUXER_H264_SEQ_PARAMETER_SET)
 351           {
 352                   if (++pos >= size)
 353                   {
 354                           seq_header = 0;
 355                           return 0;
 356                   }
 357                   pattern = (pattern << 8) | data[pos];
 358           }
 359           seq_header = pos - 3;
 360   }
 361   else
 362   {
 363           while (pattern != DEMUXER_SEQ_HEAD)
 364           {
 365                   if (++pos >= size)
 366                   {
 367                           seq_header = 0;
 368                           return 0;
 369                   }
 370                   pattern = (pattern << 8) | data[pos];
 371           }
 372           seq_header = pos - 3;
 373   }
 374   return seq_header;
 375 }
 376
 377 UINT PESPacket::findSeqExtHeader(bool h264) const
 378 {
 379   if (seq_header != 1) return seq_header;
 380   if (size < 12) return 0;
 381   UINT pattern = ( ((UINT)data[ 8] << 24) |
 382                    ((UINT)data[ 9] << 16) |
 383                    ((UINT)data[10] <<  8) |
 384                     (UINT)data[11]  );
 385   UINT pos = 11;
 386   if (h264) {
 387       while ((pattern & 0xFFFFFF1F) != DEMUXER_H264_SUB_ENHANCEMENT_INF)
 388           {
 389                   if (++pos >= size)
 390                   {
 391                           seq_header = 0;
 392                           return 0;
 393                   }
 394                   pattern = (pattern << 8) | data[pos];
 395           }
 396           seq_header = pos - 3;
 397   }
 398   else
 399   {
 400           while (pattern != DEMUXER_SEQ_EXT_HEAD && (data[pos+1]&0xf0)!=0x10)
 401           {
 402                   if (++pos >= (size-1))
 403                   {
 404                           seq_header = 0;
 405                           return 0;
 406                   }
 407                   pattern = (pattern << 8) | data[pos];
 408           }
 409           seq_header = pos - 3;
 410   }
 411   return seq_header;
 412 }
 413
 414 // Demuxer methods
 415 Demuxer::Demuxer()
 416 {
 417   if (instance) return;
 418   instance = this;
 419   initted = false;
 420   callback = NULL;
 421   arcnt = 0;
 422   vid_seeking = aud_seeking = false;
 423   video_pts = audio_pts = 0;
 424   ispre_1_3_19 = false;
 425   packetnum=0;
 426   h264 = false;
 427   fps = 25.0;
 428   astreamtype=4;
 429   livetv=false;
 430 }
 431
 432 Demuxer::~Demuxer()
 433 {
 434   shutdown();
 435   instance = NULL;
 436 }
 437
 438 Demuxer* Demuxer::getInstance()
 439 {
 440   return instance;
 441 }
 442
 443 int Demuxer::init(Callback* tcallback, DrainTarget* audio, DrainTarget* video, DrainTarget* teletext,
 444                   ULONG demuxMemoryV, ULONG demuxMemoryA, ULONG demuxMemoryT,double infps, DVBSubtitles* tsubtitles)
 445 {
 446   if (!initted)
 447   {
 448     if ( !videostream.init(video, demuxMemoryV) ||
 449          !audiostream.init(audio, demuxMemoryA) ||
 450          !teletextstream.init(teletext, demuxMemoryT))
 451     {
 452       Log::getInstance()->log("Demuxer", Log::CRIT,
 453                               "Failed to initialize demuxer");
 454       shutdown();
 455       return 0;
 456     }
 457   }
 458   if (teletext) {
 459       isteletextdecoded = true;
 460   } else {
 461       isteletextdecoded = false;
 462   }
 463   fps=infps;
 464   reset();
 465   initted = true;
 466   subtitles = tsubtitles;
 467   callback = tcallback;
 468   return 1;
 469 }
 470
 471 void Demuxer::reset()
 472 {
 473   Log::getInstance()->log("Demuxer", Log::DEBUG, "Reset called");
 474   flush();
 475   video_current = audio_current = teletext_current = subtitle_current = -1;
 476   horizontal_size = vertical_size = 0;
 477   interlaced=true; // default is true
 478   aspect_ratio = (enum AspectRatio) 0;
 479   parx=1;
 480   pary=1;
 481   frame_rate = bit_rate = 0;
 482   ispre_1_3_19 = false;
 483   h264 = false;
 484   packetnum=0;
 485   astreamtype=4;
 486   livetv=false;
 487
 488   for (int i = 0; i <= (PESTYPE_AUDMAX - PESTYPE_AUD0); i++)
 489   {
 490     avail_mpaudchan[i] = false;
 491   }
 492   for (int i = 0; i <= (PESTYPE_SUBSTREAM_AC3MAX - PESTYPE_SUBSTREAM_AC30); i++)
 493   {
 494     avail_ac3audchan[i] = false;
 495   }
 496   for (int i = 0; i <= (PESTYPE_SUBSTREAM_DVBSUBTITLEMAX - PESTYPE_SUBSTREAM_DVBSUBTITLE0); i++)
 497   {
 498     avail_dvbsubtitlechan[i] = false;
 499   }
 500 }
 501
 502 int Demuxer::shutdown()
 503 {
 504   videostream.shutdown();
 505   audiostream.shutdown();
 506   teletextstream.shutdown();
 507   initted = false;
 508   return 1;
 509 }
 510
 511 void Demuxer::flush()
 512 {
 513   Log::getInstance()->log("Demuxer", Log::DEBUG, "Flush called");
 514
 515   videostream.flush();
 516   audiostream.flush();
 517   teletextstream.flush();
 518 }
 519
 520 void Demuxer::flushAudio()
 521 {
 522   audiostream.flush();
 523 }
 524
 525 void Demuxer::seek()
 526 {
 527   vid_seeking = aud_seeking = true;
 528   video_pts = audio_pts = teletext_pts = 0;
 529 }
 530
 531 void Demuxer::setAudioStream(int id)
 532 {
 533   audio_current = id;
 534 }
 535
 536 void Demuxer::setVideoStream(int id)
 537 {
 538   video_current = id;
 539 }
 540
 541 void Demuxer::setTeletextStream(int id)
 542 {
 543   teletext_current = id;
 544 }
 545
 546 void Demuxer::setDVBSubtitleStream(int id)
 547 {
 548   subtitle_current = id;
 549 }
 550
 551 void Demuxer::setAspectRatio(enum AspectRatio ar, int taspectx, int taspecty)
 552 {
 553   if (aspect_ratio != ar)
 554   {
 555     Log::getInstance()->log("Demux", Log::DEBUG,
 556                             "Aspect ratio difference signalled");
 557     if (++arcnt > 3) // avoid changing aspect ratio if glitch in signal
 558     {
 559       arcnt = 0;
 560       aspect_ratio = ar;
 561       parx=taspectx;
 562       pary=taspecty;
 563       if (callback) callback->call(this);
 564     }
 565   }
 566   else
 567     arcnt = 0;
 568 }
 569
 570 bool Demuxer::writeAudio(bool * dataavail)
 571 {
 572   return audiostream.drain(dataavail);
 573 }
 574
 575 bool Demuxer::writeVideo(bool * dataavail)
 576 {
 577   return videostream.drain(dataavail);
 578 }
 579
 580 bool Demuxer::writeTeletext(bool * dataavail)
 581 {
 582    return teletextstream.drain(dataavail);
 583 }
 584
 585 bool Demuxer::submitPacket(PESPacket& packet)
 586 {
 587   UINT sent = 0;
 588   UCHAR packet_type = packet.getPacketType();
 589   const UCHAR* packetdata = packet.getData();
 590   if (packet_type >= PESTYPE_VID0 && packet_type <= PESTYPE_VIDMAX)
 591   {
 592     if (video_current == -1) video_current = packet_type;
 593     if (video_current == packet_type && !vid_seeking)
 594         {
 595         sent = videostream.put(&packetdata[0], packet.getSize(), h264?MPTYPE_VIDEO_H264:MPTYPE_VIDEO_MPEG2,packetnum);
 596         if (sent) packetnum++;
 597         }
 598         else
 599       sent = packet.getSize();
 600   }
 601   else if (packet_type >= PESTYPE_AUD0 && packet_type <= PESTYPE_AUDMAX)
 602   {
 603
 604     if (audio_current == -1) audio_current = packet_type;
 605     avail_mpaudchan[packet_type - PESTYPE_AUD0] = true;
 606     if (audio_current == packet_type && !aud_seeking)
 607         {
 608       UCHAR type=MPTYPE_MPEG_AUDIO;
 609       switch (astreamtype)
 610       {
 611       case 3:
 612       case 4:
 613           type=MPTYPE_MPEG_AUDIO; break;
 614       case 0x11:
 615           type=MPTYPE_AAC_LATM; break;
 616       };
 617       sent = audiostream.put(&packetdata[0], packet.getSize(), type,packetnum);
 618           if (sent)  packetnum++;
 619         }
 620         else
 621       sent = packet.getSize();
 622   }
 623   else if (packet_type == PESTYPE_PRIVATE_1 &&
 624            packet.getSubstream() >= PESTYPE_SUBSTREAM_AC30 &&
 625            packet.getSubstream() <= PESTYPE_SUBSTREAM_AC3MAX)
 626   {
 627     avail_ac3audchan[packet.getSubstream() - PESTYPE_SUBSTREAM_AC30] = true;
 628     if (packet.getSubstream() == audio_current)
 629     {
 630       sent = audiostream.put(&packetdata[0], packet.getSize(), (ispre_1_3_19 || livetv)? MPTYPE_AC3_PRE13 : MPTYPE_AC3,packetnum);
 631           if (sent) packetnum++;
 632     }
 633     else
 634     {
 635       sent = packet.getSize();
 636     }
 637   }
 638   else if (packet_type == PESTYPE_PRIVATE_1 &&
 639            packet.getSubstream() >= PESTYPE_SUBSTREAM_DVBSUBTITLE0 &&
 640            packet.getSubstream() <= PESTYPE_SUBSTREAM_DVBSUBTITLEMAX)
 641   {
 642     avail_dvbsubtitlechan[packet.getSubstream()-PESTYPE_SUBSTREAM_DVBSUBTITLE0]=true;
 643     if (subtitle_current == -1) subtitle_current = packet.getSubstream();
 644     if (subtitles && packet.getSubstream()==subtitle_current)
 645     {
 646          subtitles->put(packet);
 647     }
 648     sent = packet.getSize();
 649   }
 650   else if (isteletextdecoded  && packet_type == PESTYPE_PRIVATE_1 &&
 651            packet.getSubstream() >= PESTYPE_SUBSTREAM_TELETEXT0 &&
 652            packet.getSubstream() <= PESTYPE_SUBSTREAM_TELETEXTMAX)
 653   {
 654
 655     if (teletext_current == -1) teletext_current = packet.getSubstream();
 656     if (teletext_current == packet.getSubstream())
 657     {
 658         sent = teletextstream.put(&packetdata[0], packet.getSize(), MPTYPE_TELETEXT,packetnum);
 659     }
 660     else
 661     {
 662         sent = packet.getSize();
 663     }
 664   }
 665   else
 666   {
 667     sent = packet.getSize();
 668   }
 669
 670   if (sent < packet.getSize()) // Stream is full.
 671     return false;
 672   else
 673     return true;
 674 }
 675
 676 void Demuxer::parsePacketDetails(PESPacket& packet)
 677 {
 678     if (packet.getPacketType() >= PESTYPE_AUD0 &&
 679         packet.getPacketType() <= PESTYPE_AUDMAX)
 680     {
 681         // Extract audio PTS if it exists
 682         if (packet.hasPTS())
 683         {
 684             audio_pts = packet.getPTS();
 685             // We continue to seek on the audio if the video PTS that we
 686             // are trying to match is ahead of the audio PTS by at most
 687             // SEEK_THRESHOLD. We consider the possibility of PTS wrap.
 688             if (aud_seeking && !vid_seeking &&
 689                 !( (video_pts_seek > audio_pts &&
 690                 video_pts_seek - audio_pts < SEEK_THRESHOLD)
 691                 ||
 692                 (video_pts_seek < audio_pts &&
 693                 video_pts_seek + (1LL<<33) - audio_pts < SEEK_THRESHOLD) ))
 694             {
 695                 aud_seeking = 0;
 696                 Log::getInstance()->log("Demuxer", Log::DEBUG,
 697                     "Leaving  audio sync: Audio PTS = %llu", audio_pts);
 698             }
 699         }
 700     }
 701     else if (packet.getPacketType() == PESTYPE_PRIVATE_1) // Private stream
 702     {
 703         if (!livetv) {
 704                 //Inspired by vdr's device.c
 705                 int payload_begin = packet[8]+9;
 706                 unsigned char substream_id = packet[payload_begin];
 707                 unsigned char substream_type = substream_id & 0xF0;
 708                 unsigned char substream_index = substream_id & 0x1F;
 709                 pre_1_3_19_Recording: //This is for old recordings stuff and live TV
 710                 if (ispre_1_3_19)
 711                 {
 712                         int old_substream=packet.getSubstream();
 713                         if (old_substream){ //someone else already set it, this is live tv
 714                                 substream_id = old_substream;
 715                                 substream_type = substream_id & 0xF0;
 716                                 substream_index = substream_id & 0x1F;
 717                         } else {
 718                                 substream_id = PESTYPE_PRIVATE_1;
 719                                 substream_type = 0x80;
 720                                 substream_index = 0;
 721                         }
 722
 723                 }
 724                 switch (substream_type)
 725                 {
 726                 case 0x20://SPU
 727                 case 0x30://SPU
 728                         packet.setSubstream(substream_id);
 729                         break;
 730                 case 0xA0: //LPCM //not supported yet, is there any LPCM transmissio out there?
 731                         break;
 732                 case 0x80: //ac3, currently only one ac3 track per recording supported
 733                         packet.setSubstream(substream_type+substream_index);
 734
 735                         // Extract audio PTS if it exists
 736                         if (packet.hasPTS())
 737                         {
 738                                 audio_pts = packet.getPTS();
 739                                 // We continue to seek on the audio if the video PTS that we
 740                                 // are trying to match is ahead of the audio PTS by at most
 741                                 // SEEK_THRESHOLD. We consider the possibility of PTS wrap.
 742                                 if (aud_seeking && !vid_seeking &&
 743                                                 !( (video_pts_seek > audio_pts &&
 744                                                                 video_pts_seek - audio_pts < SEEK_THRESHOLD)
 745                                                                 ||
 746                                                                 (video_pts_seek < audio_pts &&
 747                                                                                 video_pts_seek + (1LL<<33) - audio_pts < SEEK_THRESHOLD) ))
 748                                 {
 749                                         aud_seeking = 0;
 750                                         Log::getInstance()->log("Demuxer", Log::DEBUG, "Leaving  audio sync: Audio PTS = %llu", audio_pts);
 751                                 }
 752                         }
 753                         break;
 754                 case 0x10: //Teletext Is this correct?
 755                         packet.setSubstream(substream_id);
 756                         // Extract teletxt PTS if it exists
 757                         if (packet.hasPTS())
 758                         {
 759                                 teletext_pts = packet.getPTS();
 760                         }
 761                         break;
 762                 default:
 763                         if (!ispre_1_3_19)
 764                         {
 765                                 ispre_1_3_19=true; //switching to compat mode and live tv mode
 766                                 goto pre_1_3_19_Recording;
 767                         }
 768                         else
 769                         {
 770                                 packet.setSubstream(0);
 771                         }
 772                         break;
 773                 }
 774         }
 775     }
 776     else if (packet.getPacketType() >= PESTYPE_VID0 &&
 777         packet.getPacketType() <= PESTYPE_VIDMAX)
 778     {
 779         // Extract video PTS if it exists
 780         if (packet.hasPTS()) video_pts = packet.getPTS();
 781
 782         // If there is a sequence header, extract information
 783         UINT pos = packet.findSeqHeader(h264);
 784         if (pos > 1)
 785         {
 786             if (!h264) {
 787                 pos += 4;
 788                 if (pos+6 >= packet.getSize()) return;
 789                 horizontal_size = ((int)packet[pos] << 4) | ((int)packet[pos+1] >> 4);
 790
 791                 vertical_size = (((int)packet[pos+1] & 0xf) << 8) | (int)packet[pos+2];
 792
 793                 enum AspectRatio aspect=(enum AspectRatio)(packet[pos+3] >> 4);
 794                 int aspectx=1;
 795                 int aspecty=1;
 796                 const int aspectDAR[]={0,1,1,1,4,3,16,9,221,100};
 797                 int aspectDARx=aspectDAR[aspect*2];
 798                 int aspectDARy=aspectDAR[aspect*2+1];
 799
 800                 aspectx=aspectDARx*vertical_size;
 801                 aspecty=aspectDARy*horizontal_size;
 802
 803                 int commona;
 804                 int commonb;
 805                // Log::getInstance()->log("Demuxer", Log::DEBUG, "PAR test1 %d %d %d %d ", aspectx,aspecty,commona,commonb);
 806                 commona=aspectx;
 807                 commonb=aspecty;
 808
 809                 while (commonb) {
 810                         int temp=commonb;
 811                         commonb=commona%commonb;
 812                         commona=temp;
 813                 }
 814                 aspectx=aspectx/commona;
 815                 aspecty=aspecty/commona;
 816                 //Log::getInstance()->log("Demuxer", Log::DEBUG, "PAR test2 %d %d %d %d %d %d %d", aspectx,aspecty,aspectDARx,aspectDARy,horizontal_size,vertical_size,commona);
 817
 818                 setAspectRatio(aspect,aspectx,aspecty);
 819                 frame_rate = packet[pos+3] & 0x0f;
 820                 if (frame_rate >= 1 && frame_rate <= 8)
 821                     frame_rate = FrameRates[frame_rate];
 822                 else
 823                     frame_rate = 0;
 824                 bit_rate = ((int)packet[pos+4] << 10) |
 825                     ((int)packet[pos+5] << 2) |
 826                     ((int)packet[pos+6] >> 6);
 827             }
 828             else
 829             {
 830                 /* Chris and Mark I know this is ugly, should we move this to a method  of PESPacket or to NALUUnit what would be better?
 831                 This looks so ugly since the header includes variable length parts and I have to parse through the whole header to get the wanted information*/
 832                 NALUUnit nalu(packet.getData()+pos,packet.getSize()-pos);
 833                 profile=nalu.getBits(8);
 834                 nalu.getBits(8); //constraints
 835                 nalu.getBits(8); //level_idc
 836                 nalu.getUe(); //seq_parameter_set_id
 837                 int chroma=1;
 838                 if (profile==100 || profile==110 || profile==122 || profile==144)
 839                 {
 840                     chroma=nalu.getUe();
 841                     if (chroma==3)
 842                     {
 843                         nalu.getBits(1);
 844                     }
 845                     nalu.getUe(); //bit depth lume
 846                     nalu.getUe(); //bit depth chrome
 847                     nalu.getBits(1);
 848                     if (nalu.getBits(1))
 849                     {
 850                         for (int i=0;i<8;i++){
 851                             if (nalu.getBits(1))
 852                             {
 853                                 if (i<6)
 854                                 {
 855                                     UINT lastscale=8;
 856                                     UINT nextscale=8;
 857                                     for (int j=0;j<16;j++) {
 858                                         if (nextscale!=0) {
 859                                             UINT delta=nalu.getSe();
 860                                             nextscale=(lastscale+delta+256)%256;
 861                                         }
 862                                         lastscale=(nextscale==0)?lastscale:nextscale;
 863                                     }
 864                                 }
 865                                 else
 866                                 {
 867                                     UINT lastscale=8;
 868                                     UINT nextscale=8;
 869                                     for (int j=0;j<64;j++) {
 870                                         if (nextscale!=0) {
 871                                             UINT delta=nalu.getSe();
 872                                             nextscale=(lastscale+delta+256)%256;
 873                                         }
 874                                         lastscale=(nextscale==0)?lastscale:nextscale;
 875                                     }
 876                                 }
 877                             }
 878                         }
 879                     }
 880                 }
 881                 int chromunitx=1;
 882                 int chromunity=1;
 883                 switch (chroma) {
 884                 case 0:
 885                     chromunitx=chromunity=1; break;
 886                 case 1:
 887                     chromunitx=chromunity=2; break;
 888                 case 2:
 889                     chromunitx=2;chromunity=1; break;
 890                 case 3:
 891                     chromunitx=chromunity=1; break;
 892                 };
 893
 894                 nalu.getUe(); //log2framenum
 895                 UINT temp=nalu.getUe();
 896                 if (temp==0) //pict order
 897                     nalu.getUe();
 898                 else if (temp==1) {
 899                     nalu.getBits(1);
 900                     nalu.getSe();
 901                     nalu.getSe();
 902                     UINT temp2=nalu.getUe();
 903                     for (int i=0;i<temp2;i++)
 904                         nalu.getSe();
 905                 }
 906                 nalu.getUe(); //Num refframes
 907                 nalu.getBits(1);
 908                 horizontal_size=(nalu.getUe()+1)*16;
 909
 910                 vertical_size=(nalu.getUe()+1)*16;
 911                 int tinterlaced=nalu.getBits(1);
 912                 vertical_size*=(2-tinterlaced);
 913                 interlaced=!tinterlaced;
 914
 915                 if (!tinterlaced) nalu.getBits(1);
 916                 nalu.getBits(1);
 917                 if (nalu.getBits(1))
 918                 {
 919                     horizontal_size-=nalu.getUe()*chromunitx;
 920                     horizontal_size-=nalu.getUe()*chromunitx;
 921                     vertical_size-=nalu.getUe()*(2-tinterlaced)*chromunity;
 922                     vertical_size-=nalu.getUe()*(2-tinterlaced)*chromunity;
 923                 }
 924                 if (nalu.getBits(1))
 925                 {
 926                     if (nalu.getBits(1))
 927                     {
 928                         UINT aspectratioidc=nalu.getBits(8);
 929                         bool hasaspect=false;
 930                         int aspectx,aspecty;
 931                         const float aspects[]={1., 1./1.,12./11.,10./11.,16./11.,40./33.,
 932                             24./11.,20./11.,32./11.,80./33.,18./11.,15./11.,64./33.,160./99.,4./3.,3./2.,2./1.};
 933                         const int aspectsx[]={1, 1,12,10,16,40,
 934                                                     24,20,32,80,18,15,64,160,4,3,2};
 935                         const int aspectsy[]={1, 1,11,11,11,33,11,11,11,33,11,11,33,99,3,2,1};
 936
 937                         float aspectratio=((float) horizontal_size)/((float) vertical_size);
 938                         if (aspectratioidc<=16)
 939                         {
 940                             hasaspect=true;
 941                             aspectratio*=aspects[aspectratioidc];
 942                             aspectx=aspectsx[aspectratioidc];
 943                             aspecty=aspectsy[aspectratioidc];
 944
 945                         }
 946                         else if (aspectratioidc==255)
 947                         {
 948                             int t_sar_width=nalu.getBits(16);
 949                             int t_sar_height=nalu.getBits(16);
 950                             if (t_sar_width!=0 && t_sar_height!=0)
 951                             {
 952                                 hasaspect=true;
 953                                 aspectratio*=((float)t_sar_width)/((float)t_sar_height);
 954                                 aspectx=t_sar_width;
 955                                 aspecty=t_sar_height;
 956                             }
 957                         }
 958                         if (hasaspect)
 959                         {
 960                             if (fabs(aspectratio-16./9.)<0.1) setAspectRatio(ASPECT_16_9,aspectx,aspecty);
 961                             else if (fabs(aspectratio-4./3.)<0.1) setAspectRatio(ASPECT_4_3,aspectx,aspecty);
 962                             else  setAspectRatio(ASPECT_1_1,aspectx,aspecty);
 963                         }
 964                     }
 965
 966                 }
 967
 968             }
 969             UINT posext = packet.findSeqExtHeader(h264);
 970             if (posext>1) {
 971                 if (!h264) {
 972                         interlaced=!(packet[pos+1] & 0x08); //really simple
 973                         // if more than full hd is coming we need to add additional parsers here
 974                 } else {
 975                 /*      NALUUnit nalu(packet.getData()+posext,packet.getSize()-posext);
 976                         while (!nalu.isEonalu()) {
 977                                 unsigned int payloadtype=0;
 978                                 unsigned int payloadadd=0xFF;
 979                                 while (payloadadd==0xFF && !nalu.isEonalu()) {
 980                                         payloadadd=nalu.getBits(8);
 981                                         payloadtype+=payloadadd;
 982                                 }
 983                                 unsigned int payloadsize=0;
 984                                 payloadadd=0xff;
 985                                 while (payloadadd==0xFF && !nalu.isEonalu()) {
 986                                        payloadadd=nalu.getBits(8);
 987                                        payloadsize+=payloadadd;
 988                             }
 989                                 switch (payloadtype) {
 990                                 case 1: { // picture timing SEI
 991
 992                                 } break;
 993                                 default: {
 994                                         while (payloadsize) { // not handled skip
 995                                                 nalu.getBits(8);
 996                                                 payloadsize--;
 997                                         }
 998                                 } break;
 999                                 }
1000
1001
1002
1003                         }*/
1004
1005
1006                 }
1007             }
1008
1009             if (vid_seeking)
1010             {
1011                 vid_seeking = 0;
1012                 video_pts_seek = video_pts;
1013                 Log::getInstance()->log("Demuxer", Log::DEBUG,
1014                     "Entering audio sync: Video PTS = %llu", video_pts);
1015                 Log::getInstance()->log("Demuxer", Log::DEBUG,
1016                     "Entering audio sync: Audio PTS = %llu", audio_pts);
1017             }
1018             return;
1019         }
1020     }
1021 }
1022
1023 UINT Demuxer::stripAudio(UCHAR* buf, UINT len)
1024 {
1025   UINT read_pos = 0, write_pos = 0;
1026   UINT pattern, packet_length;
1027   if (len < 4) return 0;
1028   pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
1029   while (read_pos + 7 <= len)
1030   {
1031     pattern = ((pattern & 0xFFFFFF) << 8) | buf[read_pos+3];
1032     if (pattern < (0x100|PESTYPE_VID0) || pattern > (0x100|PESTYPE_VIDMAX))
1033       read_pos++;
1034     else
1035     {
1036       packet_length = ((buf[read_pos+4] << 8) | (buf[read_pos+5])) + 6;
1037       if (read_pos + packet_length > len)
1038         read_pos = len;
1039       else
1040       {
1041         if (read_pos != write_pos)
1042           memmove(buf+write_pos, buf+read_pos, packet_length);
1043         read_pos += packet_length;
1044         write_pos += packet_length;
1045         pattern = (buf[read_pos] << 16) | (buf[read_pos+1] << 8)
1046                                         | (buf[read_pos+2]);
1047       }
1048     }
1049   }
1050   return write_pos;
1051 }
1052
1053 void Demuxer::changeTimes(UCHAR* buf, UINT len,UINT playtime)
1054 {
1055         UINT pattern, packet_length;
1056         UINT read_pos = 0;
1057         if (len < 4) return;
1058         pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
1059         while (read_pos + 7 <= len)
1060         {
1061            pattern = ((pattern & 0xFFFFFF) << 8) | buf[read_pos+3];
1062            if (pattern < (0x100|PESTYPE_VID0) || pattern > (0x100|PESTYPE_VIDMAX))
1063               read_pos++;
1064            else
1065            {
1066               packet_length = ((buf[read_pos+4] << 8) | (buf[read_pos+5])) + 6;
1067               // ok we have a packet figure out if pts and dts are present and replace them
1068               if (read_pos + 19 > len) return;
1069               ULLONG new_ts=playtime*90; //play time is on ms so multiply it by 90
1070               if (buf[read_pos+7] & 0x80) { // pts is here, replace it
1071                   buf[read_pos+9]=0x21 | (( new_ts>>29)& 0xde );
1072                   buf[read_pos+10]=0x00 |(( new_ts>>22)& 0xff );
1073                   buf[read_pos+11]=0x01 | (( new_ts>>14)& 0xfe );
1074                   buf[read_pos+12]=0x00 | (( new_ts>>7)& 0xff );
1075                   buf[read_pos+13]=0x01 | (( new_ts<<1)& 0xfe );
1076               }
1077
1078               if (buf[read_pos+7] & 0x40) { // pts is here, replace it
1079                    buf[read_pos+14]=0x21 | (( new_ts>>29)& 0xde );
1080                    buf[read_pos+15]=0x00 | (( new_ts>>22)& 0xff );
1081                    buf[read_pos+16]=0x01 | (( new_ts>>14)& 0xfe );
1082                    buf[read_pos+17]=0x00 | (( new_ts>>7)& 0xff );
1083                    buf[read_pos+18]=0x01 | (( new_ts<<1)& 0xfe );
1084               }
1085               read_pos += packet_length;
1086               pattern = (buf[read_pos] << 16) | (buf[read_pos+1] << 8)
1087                                                 | (buf[read_pos+2]);
1088               }
1089           }
1090
1091 }
1092
1093 bool Demuxer::scanForVideo(UCHAR* buf, UINT len, bool &ish264)
1094 {
1095   UINT pos = 3;
1096   UINT pattern;
1097   ish264=false;
1098   if (len < 4) return false;
1099   pattern = (buf[0] << 16) | (buf[1] << 8) | (buf[2]);
1100   while (pos < len)
1101   {
1102     pattern = ((pattern & 0xFFFFFF) << 8) | buf[pos++];
1103     if (pattern >= (0x100|PESTYPE_VID0) && pattern <= (0x100|PESTYPE_VIDMAX))
1104       return true;
1105   }
1106   return false;
1107 }
1108
1109 bool* Demuxer::getmpAudioChannels()
1110 {
1111   return avail_mpaudchan;
1112 }
1113
1114 bool* Demuxer::getac3AudioChannels()
1115 {
1116   return avail_ac3audchan;
1117 }
1118
1119 bool* Demuxer::getSubtitleChannels()
1120 {
1121   return avail_dvbsubtitlechan;
1122 }
1123
1124 int Demuxer::getselSubtitleChannel()
1125 {
1126   return subtitle_current;
1127 }
1128
1129 int Demuxer::getselAudioChannel()
1130 {
1131   return audio_current;
1132 }
1133
1134