libmpdemux/demux_ty.c

   1 /*
   2  * tivo@wingert.org, February 2003
   3  *
   4  * Copyright (C) 2003 Christopher R. Wingert
   5  *
   6  * The license covers the portions of this file regarding TiVo additions.
   7  *
   8  * Olaf Beck and Tridge (indirectly) were essential at providing
   9  * information regarding the format of the TiVo streams.
  10  *
  11  * However, no code in the following subsection is directly copied from
  12  * either author.
  13  *
  14  * This file is part of MPlayer.
  15  *
  16  * MPlayer is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * MPlayer is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License along
  27  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  28  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  29  */
  30
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <unistd.h>
  35 #include <time.h>
  36 #include <stdarg.h>
  37
  38 #include "config.h"
  39 #include "mp_msg.h"
  40 #include "help_mp.h"
  41
  42 #include "stream/stream.h"
  43 #include "demuxer.h"
  44 #include "parse_es.h"
  45 #include "stheader.h"
  46 #include "sub_cc.h"
  47 #include "libavutil/avstring.h"
  48 #include "libavutil/intreadwrite.h"
  49
  50 void skip_audio_frame( sh_audio_t *sh_audio );
  51 extern int sub_justify;
  52
  53 // 2/c0: audio data
  54 // 3/c0: audio packet header (PES header)
  55 // 4/c0: audio data (S/A only?)
  56 // 9/c0: audio packet header, AC-3 audio
  57 // 2/e0: video data
  58 // 6/e0: video packet header (PES header)
  59 // 7/e0: video sequence header start
  60 // 8/e0: video I-frame header start
  61 // a/e0: video P-frame header start
  62 // b/e0: video B-frame header start
  63 // c/e0: video GOP header start
  64 // e/01: closed-caption data
  65 // e/02: Extended data services data
  66
  67
  68 #define TIVO_PES_FILEID   0xf5467abd
  69 #define TIVO_PART_LENGTH  0x20000000
  70
  71 #define CHUNKSIZE        ( 128 * 1024 )
  72 #define MAX_AUDIO_BUFFER ( 16 * 1024 )
  73
  74 #define TY_V             1
  75 #define TY_A             2
  76
  77 typedef struct
  78 {
  79    off_t startOffset;
  80    off_t fileSize;
  81    int   chunks;
  82 } tmf_fileParts;
  83
  84 #define MAX_TMF_PARTS 16
  85
  86 typedef struct
  87 {
  88    int             whichChunk;
  89
  90    unsigned char   lastAudio[ MAX_AUDIO_BUFFER ];
  91    int             lastAudioEnd;
  92
  93    int             tivoType;           // 1 = SA, 2 = DTiVo
  94
  95    int64_t        lastAudioPTS;
  96    int64_t        lastVideoPTS;
  97
  98    off_t           size;
  99    int             readHeader;
 100
 101    int             tmf;
 102    tmf_fileParts   tmfparts[ MAX_TMF_PARTS ];
 103    int             tmf_totalparts;
 104 } TiVoInfo;
 105
 106 off_t vstream_streamsize( );
 107 void ty_ClearOSD( int start );
 108
 109 // ===========================================================================
 110 #define TMF_SIG "showing.xml"
 111
 112 // ===========================================================================
 113 static int ty_tmf_filetoparts( demuxer_t *demux, TiVoInfo *tivo )
 114 {
 115    int     parts = 0;
 116
 117    stream_seek(demux->stream, 0);
 118
 119    mp_msg( MSGT_DEMUX, MSGL_DBG3, "Dumping tar contents\n" );
 120    while (!demux->stream->eof)
 121    {
 122       char    header[ 512 ];
 123       char    *name;
 124       char    *extension;
 125       char    *sizestr;
 126       int     size;
 127       off_t   skip;
 128       if (stream_read(demux->stream, header, 512) < 512)
 129       {
 130          mp_msg( MSGT_DEMUX, MSGL_DBG3, "Read bad\n" );
 131          break;
 132       }
 133       name = header;
 134       name[99] = 0;
 135       sizestr = &header[124];
 136       sizestr[11] = 0;
 137       size = strtol(sizestr, NULL, 8);
 138
 139       mp_msg( MSGT_DEMUX, MSGL_DBG3, "name %-20.20s size %-12.12s %d\n",
 140          name, sizestr, size );
 141
 142       extension = strrchr(name, '.');
 143       if (extension && strcmp(extension, ".ty") == 0)
 144       {
 145          if ( parts >= MAX_TMF_PARTS ) {
 146             mp_msg( MSGT_DEMUX, MSGL_ERR, "ty:tmf too big\n" );
 147             break;
 148          }
 149          tivo->tmfparts[ parts ].fileSize = size;
 150          tivo->tmfparts[ parts ].startOffset = stream_tell(demux->stream);
 151          tivo->tmfparts[ parts ].chunks = size / CHUNKSIZE;
 152          mp_msg(MSGT_DEMUX, MSGL_DBG3,
 153            "tmf_filetoparts(): index %d, chunks %d\n"
 154            "tmf_filetoparts(): size %"PRId64"\n"
 155            "tmf_filetoparts(): startOffset %"PRId64"\n",
 156            parts, tivo->tmfparts[ parts ].chunks,
 157            tivo->tmfparts[ parts ].fileSize, tivo->tmfparts[ parts ].startOffset
 158          );
 159          parts++;
 160       }
 161
 162       // size rounded up to blocks
 163       skip = (size + 511) & ~511;
 164       stream_skip(demux->stream, skip);
 165    }
 166    stream_reset(demux->stream);
 167    tivo->tmf_totalparts = parts;
 168    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 169       "tmf_filetoparts(): No More Part Files %d\n", parts );
 170
 171    return 1;
 172 }
 173
 174
 175 // ===========================================================================
 176 static off_t tmf_filetooffset(TiVoInfo *tivo, int chunk)
 177 {
 178   int i;
 179   for (i = 0; i < tivo->tmf_totalparts; i++) {
 180     if (chunk < tivo->tmfparts[i].chunks)
 181       return tivo->tmfparts[i].startOffset + chunk * CHUNKSIZE;
 182     chunk -= tivo->tmfparts[i].chunks;
 183   }
 184   return -1;
 185 }
 186
 187
 188 // ===========================================================================
 189 static int tmf_load_chunk( demuxer_t *demux, TiVoInfo *tivo,
 190    unsigned char *buff, int readChunk )
 191 {
 192    off_t fileoffset;
 193    int    count;
 194
 195    mp_msg( MSGT_DEMUX, MSGL_DBG3, "\ntmf_load_chunk() begin %d\n",
 196       readChunk );
 197
 198    fileoffset = tmf_filetooffset(tivo, readChunk);
 199
 200    if (fileoffset == -1 || !stream_seek(demux->stream, fileoffset)) {
 201       mp_msg( MSGT_DEMUX, MSGL_ERR, "Read past EOF()\n" );
 202       return 0;
 203    }
 204    count = stream_read( demux->stream, buff, CHUNKSIZE );
 205    demux->filepos = stream_tell( demux->stream );
 206
 207    mp_msg( MSGT_DEMUX, MSGL_DBG3, "tmf_load_chunk() count %x\n",
 208            count );
 209
 210    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 211            "tmf_load_chunk() bytes %x %x %x %x %x %x %x %x\n",
 212            buff[ 0 ], buff[ 1 ], buff[ 2 ], buff[ 3 ],
 213            buff[ 4 ], buff[ 5 ], buff[ 6 ], buff[ 7 ] );
 214
 215    mp_msg( MSGT_DEMUX, MSGL_DBG3, "tmf_load_chunk() end\n" );
 216
 217    return count;
 218 }
 219
 220 // ===========================================================================
 221
 222 // DTiVo MPEG 336, 480, 576, 768
 223 // SA TiVo 864
 224 // DTiVo AC-3 1550
 225 //
 226 #define SERIES1_PTS_LENGTH           11
 227 #define SERIES1_PTS_OFFSET            6
 228 #define SERIES2_PTS_LENGTH           16
 229 #define SERIES2_PTS_OFFSET            9
 230 #define AC3_PTS_LENGTH               16
 231 #define AC3_PTS_OFFSET                9
 232
 233 static int IsValidAudioPacket( int size, int *ptsOffset, int *ptsLen )
 234 {
 235    // AC-3
 236    if ( size == 1550 || size == 1552 )
 237    {
 238       *ptsOffset = AC3_PTS_OFFSET;
 239       *ptsLen = AC3_PTS_LENGTH;
 240       return 1;
 241    }
 242
 243    // MPEG
 244       if ( (size & 15) == (SERIES1_PTS_LENGTH & 15) )
 245       {
 246          *ptsOffset = SERIES1_PTS_OFFSET;
 247          *ptsLen = SERIES1_PTS_LENGTH;
 248          return 1;
 249       }
 250          if ( (size & 15) == (SERIES2_PTS_LENGTH & 15) )
 251          {
 252             *ptsOffset = SERIES2_PTS_OFFSET;
 253             *ptsLen = SERIES2_PTS_LENGTH;
 254             return 1;
 255          }
 256       mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Tossing Audio Packet Size %d\n",
 257          size );
 258       return 0;
 259 }
 260
 261
 262 static int64_t get_ty_pts( unsigned char *buf )
 263 {
 264   int a = buf[0] & 0xe;
 265   int b = AV_RB16(buf + 1);
 266   int c = AV_RB16(buf + 3);
 267
 268   if (!(1 & a & b & c)) // invalid MPEG timestamp
 269     return MP_NOPTS_VALUE;
 270   a >>= 1; b >>= 1; c >>= 1;
 271   return (((uint64_t)a) << 30) | (b << 15) | c;
 272 }
 273
 274 static void demux_ty_AddToAudioBuffer( TiVoInfo *tivo, unsigned char *buffer,
 275    int size )
 276 {
 277    if ( tivo->lastAudioEnd + size < MAX_AUDIO_BUFFER )
 278    {
 279       memcpy( &tivo->lastAudio[ tivo->lastAudioEnd ],
 280          buffer, size );
 281       tivo->lastAudioEnd += size;
 282    }
 283    else
 284       mp_msg( MSGT_DEMUX, MSGL_ERR,
 285          "ty:WARNING - Would have blown my audio buffer\n" );
 286 }
 287
 288 static void demux_ty_CopyToDemuxPacket( demux_stream_t *ds,
 289        unsigned char *buffer, int size, off_t pos, int64_t pts )
 290 {
 291    demux_packet_t *dp = new_demux_packet( size );
 292    memcpy( dp->buffer, buffer, size );
 293    if (pts != MP_NOPTS_VALUE)
 294    dp->pts = pts / 90000.0;
 295    dp->pos = pos;
 296    dp->flags = 0;
 297    ds_add_packet( ds, dp );
 298 }
 299
 300 static int demux_ty_FindESHeader( uint8_t nal,
 301    unsigned char *buffer, int bufferSize )
 302 {
 303    uint32_t search = 0x00000100 | nal;
 304    uint32_t found = -1;
 305    uint8_t *p = buffer;
 306    uint8_t *end = p + bufferSize;
 307    while (p < end) {
 308       found <<= 8;
 309       found |= *p++;
 310       if (found == search)
 311          return p - buffer - 4;
 312    }
 313    return -1;
 314 }
 315
 316 static void demux_ty_FindESPacket( uint8_t nal,
 317    unsigned char *buffer, int bufferSize, int *esOffset1, int *esOffset2 )
 318 {
 319   *esOffset1 = demux_ty_FindESHeader(nal, buffer, bufferSize);
 320   if (*esOffset1 == -1) {
 321     *esOffset2 = -1;
 322     return;
 323   }
 324   buffer += *esOffset1 + 1;
 325   bufferSize -= *esOffset1 + 1;
 326   *esOffset2 = demux_ty_FindESHeader(nal, buffer, bufferSize);
 327   if (*esOffset2 != -1)
 328     *esOffset2 += *esOffset1 + 1;
 329 }
 330
 331 #define VIDEO_NAL 0xe0
 332 #define AUDIO_NAL 0xc0
 333 #define AC3_NAL 0xbd
 334
 335 static int demux_ty_fill_buffer( demuxer_t *demux, demux_stream_t *dsds )
 336 {
 337    int              invalidType = 0;
 338    int              errorHeader = 0;
 339    int              recordsDecoded = 0;
 340
 341    unsigned char    chunk[ CHUNKSIZE ];
 342    int              readSize;
 343
 344    int              numberRecs;
 345    unsigned char    *recPtr;
 346    int              offset;
 347
 348    int              counter;
 349
 350    int              aid;
 351
 352    TiVoInfo         *tivo = demux->priv;
 353
 354    if ( demux->stream->type == STREAMTYPE_DVD )
 355       return 0;
 356
 357    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty processing\n" );
 358
 359    if( demux->stream->eof ) return 0;
 360
 361    // ======================================================================
 362    // If we haven't figured out the size of the stream, let's do so
 363    // ======================================================================
 364 #ifdef STREAMTYPE_STREAM_TY
 365    if ( demux->stream->type == STREAMTYPE_STREAM_TY )
 366    {
 367       // The vstream code figures out the exact size of the stream
 368       demux->movi_start = 0;
 369       demux->movi_end = vstream_streamsize();
 370       tivo->size = vstream_streamsize();
 371    }
 372    else
 373 #endif
 374    {
 375       // If its a local file, try to find the Part Headers, so we can
 376       // calculate the ACTUAL stream size
 377       // If we can't find it, go off with the file size and hope the
 378       // extract program did the "right thing"
 379       if ( tivo->readHeader == 0 )
 380       {
 381          off_t filePos;
 382          tivo->readHeader = 1;
 383
 384          filePos = demux->filepos;
 385          stream_seek( demux->stream, 0 );
 386
 387          readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 388
 389          if ( memcmp( chunk, TMF_SIG, sizeof( TMF_SIG ) ) == 0 )
 390          {
 391             mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Detected a tmf\n" );
 392             tivo->tmf = 1;
 393             ty_tmf_filetoparts( demux, tivo );
 394             readSize = tmf_load_chunk( demux, tivo, chunk, 0 );
 395          }
 396
 397          if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 398          {
 399                off_t numberParts;
 400
 401                readSize = 0;
 402
 403                if ( tivo->tmf != 1 )
 404                {
 405                   off_t offset;
 406
 407                   numberParts = demux->stream->end_pos / TIVO_PART_LENGTH;
 408                   offset = numberParts * TIVO_PART_LENGTH;
 409
 410                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty/ty+Number Parts %"PRId64"\n",
 411                     (int64_t)numberParts );
 412
 413                   if ( offset + CHUNKSIZE < demux->stream->end_pos )
 414                   {
 415                      stream_seek( demux->stream, offset );
 416                      readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 417                   }
 418                }
 419                else
 420                {
 421                   numberParts = tivo->tmf_totalparts;
 422                   offset = numberParts * TIVO_PART_LENGTH;
 423                   readSize = tmf_load_chunk( demux, tivo, chunk,
 424                      numberParts * ( TIVO_PART_LENGTH - CHUNKSIZE ) /
 425                      CHUNKSIZE );
 426                }
 427
 428                if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 429                {
 430                      int size = AV_RB24(chunk + 12);
 431                      size -= 4;
 432                      size *= CHUNKSIZE;
 433                      tivo->size = numberParts * TIVO_PART_LENGTH;
 434                      tivo->size += size;
 435                      mp_msg( MSGT_DEMUX, MSGL_DBG3,
 436                         "ty:Header Calc Stream Size %"PRId64"\n", tivo->size );
 437                }
 438          }
 439
 440          if ( demux->stream->start_pos > 0 )
 441             filePos = demux->stream->start_pos;
 442          stream_seek( demux->stream, filePos );
 443          demux->filepos = stream_tell( demux->stream );
 444          tivo->whichChunk = filePos / CHUNKSIZE;
 445       }
 446       demux->movi_start = 0;
 447       demux->movi_end = tivo->size;
 448    }
 449
 450    // ======================================================================
 451    // Give a clue as to where we are in the stream
 452    // ======================================================================
 453    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 454       "ty:ty header size %"PRIx64"\n", (int64_t)tivo->size );
 455    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 456       "ty:ty which Chunk %d\n", tivo->whichChunk );
 457    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 458       "ty:file end_pos   %"PRIx64"\n", (int64_t)demux->stream->end_pos );
 459    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 460       "\nty:wanted current offset %"PRIx64"\n", (int64_t)stream_tell( demux->stream ) );
 461
 462    if ( tivo->size > 0 && stream_tell( demux->stream ) > tivo->size )
 463    {
 464          demux->stream->eof = 1;
 465          return 0;
 466    }
 467
 468    do {
 469    if ( tivo->tmf != 1 )
 470    {
 471       // Make sure we are on a 128k boundary
 472       if ( demux->filepos % CHUNKSIZE != 0 )
 473       {
 474          int whichChunk = demux->filepos / CHUNKSIZE;
 475          if ( demux->filepos % CHUNKSIZE > CHUNKSIZE / 2 )
 476             whichChunk++;
 477          stream_seek( demux->stream, whichChunk * CHUNKSIZE );
 478       }
 479
 480       demux->filepos = stream_tell( demux->stream );
 481       tivo->whichChunk = demux->filepos / CHUNKSIZE;
 482       readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 483       if ( readSize != CHUNKSIZE )
 484          return 0;
 485    }
 486    else
 487    {
 488       readSize = tmf_load_chunk( demux, tivo, chunk, tivo->whichChunk );
 489       if ( readSize != CHUNKSIZE )
 490          return 0;
 491       tivo->whichChunk++;
 492    }
 493    if (AV_RB32(chunk) == TIVO_PES_FILEID)
 494       mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Skipping PART Header\n" );
 495    } while (AV_RB32(chunk) == TIVO_PES_FILEID);
 496
 497    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 498       "\nty:actual current offset %"PRIx64"\n", stream_tell( demux->stream ) -
 499       CHUNKSIZE );
 500
 501
 502    // Let's make a Video Demux Stream for MPlayer
 503    aid = 0x0;
 504    if( !demux->v_streams[ aid ] ) new_sh_video( demux, aid );
 505    if( demux->video->id == -1 ) demux->video->id = aid;
 506    if( demux->video->id == aid )
 507    {
 508       demux_stream_t *ds = demux->video;
 509       if( !ds->sh ) ds->sh = demux->v_streams[ aid ];
 510    }
 511
 512    // ======================================================================
 513    // Finally, we get to actually parse the chunk
 514    // ======================================================================
 515    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty parsing a chunk\n" );
 516    numberRecs = chunk[ 0 ];
 517    recPtr = &chunk[ 4 ];
 518    offset = numberRecs * 16 + 4;
 519    for ( counter = 0 ; counter < numberRecs ; counter++ )
 520    {
 521       int size = AV_RB24(recPtr) >> 4;
 522       int type = recPtr[ 3 ];
 523       int nybbleType = recPtr[ 2 ] & 0x0f;
 524       recordsDecoded++;
 525
 526       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 527          "ty:Record Type %x/%x %d\n", nybbleType, type, size );
 528
 529       // ================================================================
 530       // Video Parsing
 531       // ================================================================
 532       if ( type == 0xe0 )
 533       {
 534          if ( size > 0 && size + offset <= CHUNKSIZE )
 535          {
 536             int esOffset1 = demux_ty_FindESHeader( VIDEO_NAL, &chunk[ offset ],
 537                size);
 538             if ( esOffset1 != -1 )
 539                tivo->lastVideoPTS = get_ty_pts(
 540                   &chunk[ offset + esOffset1 + 9 ] );
 541
 542             // Do NOT Pass the PES Header onto the MPEG2 Decode
 543             if( nybbleType != 0x06 )
 544                demux_ty_CopyToDemuxPacket( demux->video,
 545                   &chunk[ offset ], size, demux->filepos + offset,
 546                   tivo->lastVideoPTS );
 547             offset += size;
 548          }
 549          else
 550             errorHeader++;
 551       }
 552       // ================================================================
 553       // Audio Parsing
 554       // ================================================================
 555       else if ( type == 0xc0 )
 556       {
 557          if ( size > 0 && size + offset <= CHUNKSIZE )
 558          {
 559             if( demux->audio->id == -1 )
 560             {
 561                if ( nybbleType == 0x02 )
 562                   continue;    // DTiVo inconclusive, wait for more
 563                else if ( nybbleType == 0x09 )
 564                {
 565                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting AC-3 Audio\n" );
 566                   aid = 0x80;  // AC-3
 567                }
 568                else
 569                {
 570                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting MPEG Audio\n" );
 571                   aid = 0x0;   // MPEG Audio
 572                }
 573
 574                demux->audio->id = aid;
 575                if( !demux->a_streams[ aid ] ) new_sh_audio( demux, aid );
 576                if( demux->audio->id == aid )
 577                {
 578                   demux_stream_t *ds = demux->audio;
 579                   if( !ds->sh ) {
 580                     sh_audio_t* sh_a;
 581                     ds->sh = demux->a_streams[ aid ];
 582                     sh_a = (sh_audio_t*)ds->sh;
 583                     switch(aid & 0xE0){  // 1110 0000 b  (high 3 bit: type  low 5: id)
 584                       case 0x00: sh_a->format=0x50;break; // mpeg
 585                       case 0xA0: sh_a->format=0x10001;break;  // dvd pcm
 586                       case 0x80: if((aid & 0xF8) == 0x88) sh_a->format=0x2001;//dts
 587                                   else sh_a->format=0x2000;break; // ac3
 588                     }
 589                  }
 590                }
 591             }
 592
 593             aid = demux->audio->id;
 594
 595
 596             // SA DTiVo Audio Data, no PES
 597             // ================================================
 598             if ( nybbleType == 0x02 || nybbleType == 0x04 )
 599             {
 600                if ( nybbleType == 0x02 && tivo->tivoType == 2 )
 601                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 602                else
 603                {
 604
 605                   mp_msg( MSGT_DEMUX, MSGL_DBG3,
 606                      "ty:Adding Audio Packet Size %d\n", size );
 607                   demux_ty_CopyToDemuxPacket( demux->audio,
 608                      &chunk[ offset ], size, ( demux->filepos + offset ),
 609                      tivo->lastAudioPTS );
 610                }
 611             }
 612
 613             // 3 - MPEG Audio with PES Header, either SA or DTiVo
 614             // 9 - DTiVo AC3 Audio Data with PES Header
 615             // ================================================
 616             if ( nybbleType == 0x03 || nybbleType == 0x09 )
 617             {
 618                int esOffset1, esOffset2;
 619                if ( nybbleType == 0x03 )
 620                esOffset1 = demux_ty_FindESHeader( AUDIO_NAL, &chunk[ offset ],
 621                   size);
 622
 623                // SA PES Header, No Audio Data
 624                // ================================================
 625                if ( nybbleType == 0x03 && esOffset1 == 0 && size == 16 )
 626                {
 627                   tivo->tivoType = 1;
 628                   tivo->lastAudioPTS = get_ty_pts( &chunk[ offset +
 629                      SERIES2_PTS_OFFSET ] );
 630                }
 631                else
 632                // DTiVo Audio with PES Header
 633                // ================================================
 634                {
 635                   tivo->tivoType = 2;
 636
 637                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 638                   demux_ty_FindESPacket( nybbleType == 9 ? AC3_NAL : AUDIO_NAL,
 639                      tivo->lastAudio, tivo->lastAudioEnd, &esOffset1,
 640                      &esOffset2 );
 641
 642                   if ( esOffset1 != -1 && esOffset2 != -1 )
 643                   {
 644                      int packetSize = esOffset2 - esOffset1;
 645                      int headerSize;
 646                      int ptsOffset;
 647
 648                      if ( IsValidAudioPacket( packetSize, &ptsOffset,
 649                            &headerSize ) )
 650                      {
 651                         mp_msg( MSGT_DEMUX, MSGL_DBG3,
 652                            "ty:Adding DTiVo Audio Packet Size %d\n",
 653                            packetSize );
 654
 655                         tivo->lastAudioPTS = get_ty_pts(
 656                            &tivo->lastAudio[ esOffset1 + ptsOffset ] );
 657
 658                         if (nybbleType == 9) headerSize = 0;
 659                         demux_ty_CopyToDemuxPacket
 660                         (
 661                            demux->audio,
 662                            &tivo->lastAudio[ esOffset1 + headerSize ],
 663                            packetSize - headerSize,
 664                            demux->filepos + offset,
 665                            tivo->lastAudioPTS
 666                         );
 667
 668                      }
 669
 670                      // Collapse the Audio Buffer
 671                      tivo->lastAudioEnd -= esOffset2;
 672                      memmove( &tivo->lastAudio[ 0 ],
 673                         &tivo->lastAudio[ esOffset2 ],
 674                         tivo->lastAudioEnd );
 675                   }
 676                }
 677             }
 678
 679             offset += size;
 680          }
 681          else
 682             errorHeader++;
 683       }
 684       // ================================================================
 685       // 1 = Closed Caption
 686       // 2 = Extended Data Services
 687       // ================================================================
 688       else if ( type == 0x01 || type == 0x02 )
 689       {
 690                         unsigned char lastXDS[ 16 ];
 691          int b = AV_RB24(recPtr) >> 4;
 692          b &= 0x7f7f;
 693
 694          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:%s %04x\n", type == 1 ? "CC" : "XDS", b);
 695
 696          lastXDS[ 0x00 ] = 0x00;
 697          lastXDS[ 0x01 ] = 0x00;
 698          lastXDS[ 0x02 ] = 0x01;
 699          lastXDS[ 0x03 ] = 0xb2;
 700          lastXDS[ 0x04 ] = 'T';
 701          lastXDS[ 0x05 ] = 'Y';
 702          lastXDS[ 0x06 ] = type;
 703          lastXDS[ 0x07 ] = b >> 8;
 704          lastXDS[ 0x08 ] = b;
 705          if ( subcc_enabled )
 706             demux_ty_CopyToDemuxPacket( demux->video, lastXDS, 0x09,
 707                demux->filepos + offset, tivo->lastVideoPTS );
 708       }
 709       // ================================================================
 710       // Unknown
 711       // ================================================================
 712       else
 713       {
 714          if ( size > 0 && size + offset <= CHUNKSIZE )
 715             offset += size;
 716          if (type != 3 && type != 5 && (type != 0 || size > 0)) {
 717          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Invalid Type %x\n", type );
 718          invalidType++;
 719          }
 720       }
 721      recPtr += 16;
 722    }
 723
 724    if ( errorHeader > 0 || invalidType > 0 )
 725    {
 726       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 727          "ty:Error Check - Records %d, Parsed %d, Errors %d + %d\n",
 728          numberRecs, recordsDecoded, errorHeader, invalidType );
 729
 730       // Invalid MPEG ES Size Check
 731       if ( errorHeader > numberRecs / 2 )
 732          return 0;
 733
 734       // Invalid MPEG Stream Type Check
 735       if ( invalidType > numberRecs / 2 )
 736          return 0;
 737    }
 738
 739    demux->filepos = stream_tell( demux->stream );
 740
 741    return 1;
 742 }
 743
 744 static void demux_seek_ty( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags )
 745 {
 746    demux_stream_t *d_audio = demuxer->audio;
 747    demux_stream_t *d_video = demuxer->video;
 748    sh_audio_t     *sh_audio = d_audio->sh;
 749    sh_video_t     *sh_video = d_video->sh;
 750    off_t          newpos;
 751    off_t          res;
 752    TiVoInfo       *tivo = demuxer->priv;
 753
 754    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Seeking to %7.1f\n", rel_seek_secs );
 755
 756       tivo->lastAudioEnd = 0;
 757       tivo->lastAudioPTS = MP_NOPTS_VALUE;
 758       tivo->lastVideoPTS = MP_NOPTS_VALUE;
 759    //
 760    //================= seek in MPEG ==========================
 761    demuxer->filepos = stream_tell( demuxer->stream );
 762
 763    newpos = ( flags & SEEK_ABSOLUTE ) ? demuxer->movi_start : demuxer->filepos;
 764
 765    if( flags & SEEK_FACTOR )
 766       // float seek 0..1
 767       newpos += ( demuxer->movi_end - demuxer->movi_start ) * rel_seek_secs;
 768    else
 769    {
 770       // time seek (secs)
 771       if( ! sh_video->i_bps ) // unspecified or VBR
 772          newpos += 2324 * 75 * rel_seek_secs; // 174.3 kbyte/sec
 773       else
 774          newpos += sh_video->i_bps * rel_seek_secs;
 775    }
 776
 777    if ( newpos < demuxer->movi_start )
 778    {
 779       if( demuxer->stream->type != STREAMTYPE_VCD ) demuxer->movi_start = 0;
 780       if( newpos < demuxer->movi_start ) newpos = demuxer->movi_start;
 781    }
 782
 783    res = newpos / CHUNKSIZE;
 784    if ( rel_seek_secs >= 0 )
 785       newpos = ( res + 1 ) * CHUNKSIZE;
 786    else
 787       newpos = res * CHUNKSIZE;
 788
 789    if ( newpos < 0 )
 790       newpos = 0;
 791
 792    tivo->whichChunk = newpos / CHUNKSIZE;
 793
 794    stream_seek( demuxer->stream, newpos );
 795
 796    // re-sync video:
 797    videobuf_code_len = 0; // reset ES stream buffer
 798
 799    ds_fill_buffer( d_video );
 800    if( sh_audio )
 801      ds_fill_buffer( d_audio );
 802
 803    while( 1 )
 804    {
 805      int i;
 806      if( sh_audio && !d_audio->eof && d_video->pts && d_audio->pts )
 807      {
 808         float a_pts = d_audio->pts;
 809         a_pts += ( ds_tell_pts( d_audio ) - sh_audio->a_in_buffer_len ) /
 810            (float)sh_audio->i_bps;
 811         if( d_video->pts > a_pts )
 812         {
 813            skip_audio_frame( sh_audio );  // sync audio
 814            continue;
 815         }
 816      }
 817      i = sync_video_packet( d_video );
 818      if( i == 0x1B3 || i == 0x1B8 ) break; // found it!
 819      if( !i || !skip_video_packet( d_video ) ) break; // EOF?
 820    }
 821    if ( subcc_enabled )
 822       ty_ClearOSD( 0 );
 823 }
 824
 825 static int demux_ty_control( demuxer_t *demuxer,int cmd, void *arg )
 826 {
 827    demux_stream_t *d_video = demuxer->video;
 828    sh_video_t     *sh_video = d_video->sh;
 829
 830    switch(cmd)
 831    {
 832       case DEMUXER_CTRL_GET_TIME_LENGTH:
 833          if(!sh_video->i_bps)  // unspecified or VBR
 834              return DEMUXER_CTRL_DONTKNOW;
 835          *(double *)arg=
 836             (double)demuxer->movi_end-demuxer->movi_start/sh_video->i_bps;
 837          return DEMUXER_CTRL_GUESS;
 838
 839       case DEMUXER_CTRL_GET_PERCENT_POS:
 840           return DEMUXER_CTRL_DONTKNOW;
 841        default:
 842           return DEMUXER_CTRL_NOTIMPL;
 843     }
 844 }
 845
 846
 847 static void demux_close_ty( demuxer_t *demux )
 848 {
 849    TiVoInfo         *tivo = demux->priv;
 850
 851       free( tivo );
 852       sub_justify = 0;
 853 }
 854
 855
 856 static int ty_check_file(demuxer_t* demuxer)
 857 {
 858   TiVoInfo *tivo = calloc(1, sizeof(TiVoInfo));
 859   demuxer->priv = tivo;
 860   return ds_fill_buffer(demuxer->video) ? DEMUXER_TYPE_MPEG_TY : 0;
 861 }
 862
 863
 864 static demuxer_t* demux_open_ty(demuxer_t* demuxer)
 865 {
 866     sh_audio_t *sh_audio=NULL;
 867     sh_video_t *sh_video=NULL;
 868
 869     sh_video=demuxer->video->sh;sh_video->ds=demuxer->video;
 870
 871     if(demuxer->audio->id!=-2) {
 872         if(!ds_fill_buffer(demuxer->audio)){
 873             mp_tmsg(MSGT_DEMUXER,MSGL_INFO,"MPEG: " "No audio stream found -> no sound.\n");
 874             demuxer->audio->sh=NULL;
 875         } else {
 876             sh_audio=demuxer->audio->sh;sh_audio->ds=demuxer->audio;
 877         }
 878     }
 879
 880     return demuxer;
 881 }
 882
 883
 884 const demuxer_desc_t demuxer_desc_mpeg_ty = {
 885   "TiVo demuxer",
 886   "tivo",
 887   "TiVo",
 888   "Christopher R. Wingert",
 889   "Demux streams from TiVo",
 890   DEMUXER_TYPE_MPEG_TY,
 891   0, // unsafe autodetect
 892   ty_check_file,
 893   demux_ty_fill_buffer,
 894   demux_open_ty,
 895   demux_close_ty,
 896   demux_seek_ty,
 897   demux_ty_control
 898 };