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 "ffmpeg_files/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    unsigned char   chunk[ CHUNKSIZE ];
  90
  91    unsigned char   lastAudio[ MAX_AUDIO_BUFFER ];
  92    int             lastAudioEnd;
  93
  94    int             tivoType;           // 1 = SA, 2 = DTiVo
  95
  96    int64_t        lastAudioPTS;
  97    int64_t        lastVideoPTS;
  98
  99    off_t           size;
 100    int             readHeader;
 101
 102    int             tmf;
 103    tmf_fileParts   tmfparts[ MAX_TMF_PARTS ];
 104    int             tmf_totalparts;
 105 } TiVoInfo;
 106
 107 off_t vstream_streamsize( );
 108 void ty_ClearOSD( int start );
 109
 110 // ===========================================================================
 111 #define TMF_SIG "showing.xml"
 112
 113 // ===========================================================================
 114 static int ty_tmf_filetoparts( demuxer_t *demux, TiVoInfo *tivo )
 115 {
 116    int     parts = 0;
 117
 118    stream_seek(demux->stream, 0);
 119
 120    mp_msg( MSGT_DEMUX, MSGL_DBG3, "Dumping tar contents\n" );
 121    while (!demux->stream->eof)
 122    {
 123       char    header[ 512 ];
 124       char    *name;
 125       char    *extension;
 126       char    *sizestr;
 127       int     size;
 128       off_t   skip;
 129       if (stream_read(demux->stream, header, 512) < 512)
 130       {
 131          mp_msg( MSGT_DEMUX, MSGL_DBG3, "Read bad\n" );
 132          break;
 133       }
 134       name = header;
 135       name[99] = 0;
 136       sizestr = &header[124];
 137       sizestr[11] = 0;
 138       size = strtol(sizestr, NULL, 8);
 139
 140       mp_msg( MSGT_DEMUX, MSGL_DBG3, "name %-20.20s size %-12.12s %d\n",
 141          name, sizestr, size );
 142
 143       extension = strrchr(name, '.');
 144       if (extension && strcmp(extension, ".ty") == 0)
 145       {
 146          if ( parts >= MAX_TMF_PARTS ) {
 147             mp_msg( MSGT_DEMUX, MSGL_ERR, "ty:tmf too big\n" );
 148             break;
 149          }
 150          tivo->tmfparts[ parts ].fileSize = size;
 151          tivo->tmfparts[ parts ].startOffset = stream_tell(demux->stream);
 152          tivo->tmfparts[ parts ].chunks = size / CHUNKSIZE;
 153          mp_msg(MSGT_DEMUX, MSGL_DBG3,
 154            "tmf_filetoparts(): index %d, chunks %d\n"
 155            "tmf_filetoparts(): size %"PRId64"\n"
 156            "tmf_filetoparts(): startOffset %"PRId64"\n",
 157            parts, tivo->tmfparts[ parts ].chunks,
 158            tivo->tmfparts[ parts ].fileSize, tivo->tmfparts[ parts ].startOffset
 159          );
 160          parts++;
 161       }
 162
 163       // size rounded up to blocks
 164       skip = (size + 511) & ~511;
 165       stream_skip(demux->stream, skip);
 166    }
 167    stream_reset(demux->stream);
 168    tivo->tmf_totalparts = parts;
 169    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 170       "tmf_filetoparts(): No More Part Files %d\n", parts );
 171
 172    return 1;
 173 }
 174
 175
 176 // ===========================================================================
 177 static off_t tmf_filetooffset(TiVoInfo *tivo, int chunk)
 178 {
 179   int i;
 180   for (i = 0; i < tivo->tmf_totalparts; i++) {
 181     if (chunk < tivo->tmfparts[i].chunks)
 182       return tivo->tmfparts[i].startOffset + chunk * CHUNKSIZE;
 183     chunk -= tivo->tmfparts[i].chunks;
 184   }
 185   return -1;
 186 }
 187
 188
 189 // ===========================================================================
 190 static int tmf_load_chunk( demuxer_t *demux, TiVoInfo *tivo,
 191    unsigned char *buff, int readChunk )
 192 {
 193    off_t fileoffset;
 194    int    count;
 195
 196    mp_msg( MSGT_DEMUX, MSGL_DBG3, "\ntmf_load_chunk() begin %d\n",
 197       readChunk );
 198
 199    fileoffset = tmf_filetooffset(tivo, readChunk);
 200
 201    if (fileoffset == -1 || !stream_seek(demux->stream, fileoffset)) {
 202       mp_msg( MSGT_DEMUX, MSGL_ERR, "Read past EOF()\n" );
 203       return 0;
 204    }
 205    count = stream_read( demux->stream, buff, CHUNKSIZE );
 206    demux->filepos = stream_tell( demux->stream );
 207
 208    mp_msg( MSGT_DEMUX, MSGL_DBG3, "tmf_load_chunk() count %x\n",
 209            count );
 210
 211    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 212            "tmf_load_chunk() bytes %x %x %x %x %x %x %x %x\n",
 213            buff[ 0 ], buff[ 1 ], buff[ 2 ], buff[ 3 ],
 214            buff[ 4 ], buff[ 5 ], buff[ 6 ], buff[ 7 ] );
 215
 216    mp_msg( MSGT_DEMUX, MSGL_DBG3, "tmf_load_chunk() end\n" );
 217
 218    return count;
 219 }
 220
 221 // ===========================================================================
 222
 223 // DTiVo MPEG 336, 480, 576, 768
 224 // SA TiVo 864
 225 // DTiVo AC-3 1550
 226 //
 227 #define SERIES1_PTS_LENGTH           11
 228 #define SERIES1_PTS_OFFSET            6
 229 #define SERIES2_PTS_LENGTH           16
 230 #define SERIES2_PTS_OFFSET            9
 231 #define AC3_PTS_LENGTH               16
 232 #define AC3_PTS_OFFSET                9
 233
 234 static int IsValidAudioPacket( int size, int *ptsOffset, int *ptsLen )
 235 {
 236    // AC-3
 237    if ( size == 1550 || size == 1552 )
 238    {
 239       *ptsOffset = AC3_PTS_OFFSET;
 240       *ptsLen = AC3_PTS_LENGTH;
 241       return 1;
 242    }
 243
 244    // MPEG
 245       if ( (size & 15) == (SERIES1_PTS_LENGTH & 15) )
 246       {
 247          *ptsOffset = SERIES1_PTS_OFFSET;
 248          *ptsLen = SERIES1_PTS_LENGTH;
 249          return 1;
 250       }
 251          if ( (size & 15) == (SERIES2_PTS_LENGTH & 15) )
 252          {
 253             *ptsOffset = SERIES2_PTS_OFFSET;
 254             *ptsLen = SERIES2_PTS_LENGTH;
 255             return 1;
 256          }
 257       mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Tossing Audio Packet Size %d\n",
 258          size );
 259       return 0;
 260 }
 261
 262
 263 static int64_t get_ty_pts( unsigned char *buf )
 264 {
 265   int a = buf[0] & 0xe;
 266   int b = AV_RB16(buf + 1);
 267   int c = AV_RB16(buf + 3);
 268
 269   if (!(1 & a & b & c)) // invalid MPEG timestamp
 270     return MP_NOPTS_VALUE;
 271   a >>= 1; b >>= 1; c >>= 1;
 272   return (((uint64_t)a) << 30) | (b << 15) | c;
 273 }
 274
 275 static void demux_ty_AddToAudioBuffer( TiVoInfo *tivo, unsigned char *buffer,
 276    int size )
 277 {
 278    if ( tivo->lastAudioEnd + size < MAX_AUDIO_BUFFER )
 279    {
 280       memcpy( &tivo->lastAudio[ tivo->lastAudioEnd ],
 281          buffer, size );
 282       tivo->lastAudioEnd += size;
 283    }
 284    else
 285       mp_msg( MSGT_DEMUX, MSGL_ERR,
 286          "ty:WARNING - Would have blown my audio buffer\n" );
 287 }
 288
 289 static void demux_ty_CopyToDemuxPacket( demux_stream_t *ds,
 290        unsigned char *buffer, int size, off_t pos, int64_t pts )
 291 {
 292    demux_packet_t *dp = new_demux_packet( size );
 293    memcpy( dp->buffer, buffer, size );
 294    if (pts != MP_NOPTS_VALUE)
 295    dp->pts = pts / 90000.0;
 296    dp->pos = pos;
 297    dp->flags = 0;
 298    ds_add_packet( ds, dp );
 299 }
 300
 301 static int demux_ty_FindESHeader( uint8_t nal,
 302    unsigned char *buffer, int bufferSize )
 303 {
 304    uint32_t search = 0x00000100 | nal;
 305    uint32_t found = -1;
 306    uint8_t *p = buffer;
 307    uint8_t *end = p + bufferSize;
 308    while (p < end) {
 309       found <<= 8;
 310       found |= *p++;
 311       if (found == search)
 312          return p - buffer - 4;
 313    }
 314    return -1;
 315 }
 316
 317 static void demux_ty_FindESPacket( uint8_t nal,
 318    unsigned char *buffer, int bufferSize, int *esOffset1, int *esOffset2 )
 319 {
 320   *esOffset1 = demux_ty_FindESHeader(nal, buffer, bufferSize);
 321   if (*esOffset1 == -1) {
 322     *esOffset2 = -1;
 323     return;
 324   }
 325   buffer += *esOffset1 + 1;
 326   bufferSize -= *esOffset1 + 1;
 327   *esOffset2 = demux_ty_FindESHeader(nal, buffer, bufferSize);
 328   if (*esOffset2 != -1)
 329     *esOffset2 += *esOffset1 + 1;
 330 }
 331
 332 #define VIDEO_NAL 0xe0
 333 #define AUDIO_NAL 0xc0
 334 #define AC3_NAL 0xbd
 335
 336 static int demux_ty_fill_buffer( demuxer_t *demux, demux_stream_t *dsds )
 337 {
 338    int              invalidType = 0;
 339    int              errorHeader = 0;
 340    int              recordsDecoded = 0;
 341
 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    unsigned char    *chunk = tivo->chunk;
 354
 355    if ( demux->stream->type == STREAMTYPE_DVD )
 356       return 0;
 357
 358    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty processing\n" );
 359
 360    if( demux->stream->eof ) return 0;
 361
 362    // ======================================================================
 363    // If we haven't figured out the size of the stream, let's do so
 364    // ======================================================================
 365 #ifdef STREAMTYPE_STREAM_TY
 366    if ( demux->stream->type == STREAMTYPE_STREAM_TY )
 367    {
 368       // The vstream code figures out the exact size of the stream
 369       demux->movi_start = 0;
 370       demux->movi_end = vstream_streamsize();
 371       tivo->size = vstream_streamsize();
 372    }
 373    else
 374 #endif
 375    {
 376       // If its a local file, try to find the Part Headers, so we can
 377       // calculate the ACTUAL stream size
 378       // If we can't find it, go off with the file size and hope the
 379       // extract program did the "right thing"
 380       if ( tivo->readHeader == 0 )
 381       {
 382          off_t filePos;
 383          tivo->readHeader = 1;
 384
 385          filePos = demux->filepos;
 386          stream_seek( demux->stream, 0 );
 387
 388          readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 389
 390          if ( memcmp( chunk, TMF_SIG, sizeof( TMF_SIG ) ) == 0 )
 391          {
 392             mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Detected a tmf\n" );
 393             tivo->tmf = 1;
 394             ty_tmf_filetoparts( demux, tivo );
 395             readSize = tmf_load_chunk( demux, tivo, chunk, 0 );
 396          }
 397
 398          if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 399          {
 400                off_t numberParts;
 401
 402                readSize = 0;
 403
 404                if ( tivo->tmf != 1 )
 405                {
 406                   off_t offset;
 407
 408                   numberParts = demux->stream->end_pos / TIVO_PART_LENGTH;
 409                   offset = numberParts * TIVO_PART_LENGTH;
 410
 411                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty/ty+Number Parts %"PRId64"\n",
 412                     (int64_t)numberParts );
 413
 414                   if ( offset + CHUNKSIZE < demux->stream->end_pos )
 415                   {
 416                      stream_seek( demux->stream, offset );
 417                      readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 418                   }
 419                }
 420                else
 421                {
 422                   numberParts = tivo->tmf_totalparts;
 423                   offset = numberParts * TIVO_PART_LENGTH;
 424                   readSize = tmf_load_chunk( demux, tivo, chunk,
 425                      numberParts * ( TIVO_PART_LENGTH - CHUNKSIZE ) /
 426                      CHUNKSIZE );
 427                }
 428
 429                if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 430                {
 431                      int size = AV_RB24(chunk + 12);
 432                      size -= 4;
 433                      size *= CHUNKSIZE;
 434                      tivo->size = numberParts * TIVO_PART_LENGTH;
 435                      tivo->size += size;
 436                      mp_msg( MSGT_DEMUX, MSGL_DBG3,
 437                         "ty:Header Calc Stream Size %"PRId64"\n", tivo->size );
 438                }
 439          }
 440
 441          if ( demux->stream->start_pos > 0 )
 442             filePos = demux->stream->start_pos;
 443          stream_seek( demux->stream, filePos );
 444          demux->filepos = stream_tell( demux->stream );
 445          tivo->whichChunk = filePos / CHUNKSIZE;
 446       }
 447       demux->movi_start = 0;
 448       demux->movi_end = tivo->size;
 449    }
 450
 451    // ======================================================================
 452    // Give a clue as to where we are in the stream
 453    // ======================================================================
 454    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 455       "ty:ty header size %"PRIx64"\n", (int64_t)tivo->size );
 456    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 457       "ty:ty which Chunk %d\n", tivo->whichChunk );
 458    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 459       "ty:file end_pos   %"PRIx64"\n", (int64_t)demux->stream->end_pos );
 460    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 461       "\nty:wanted current offset %"PRIx64"\n", (int64_t)stream_tell( demux->stream ) );
 462
 463    if ( tivo->size > 0 && stream_tell( demux->stream ) > tivo->size )
 464    {
 465          demux->stream->eof = 1;
 466          return 0;
 467    }
 468
 469    do {
 470    if ( tivo->tmf != 1 )
 471    {
 472       // Make sure we are on a 128k boundary
 473       if ( demux->filepos % CHUNKSIZE != 0 )
 474       {
 475          int whichChunk = demux->filepos / CHUNKSIZE;
 476          if ( demux->filepos % CHUNKSIZE > CHUNKSIZE / 2 )
 477             whichChunk++;
 478          stream_seek( demux->stream, whichChunk * CHUNKSIZE );
 479       }
 480
 481       demux->filepos = stream_tell( demux->stream );
 482       tivo->whichChunk = demux->filepos / CHUNKSIZE;
 483       readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 484       if ( readSize != CHUNKSIZE )
 485          return 0;
 486    }
 487    else
 488    {
 489       readSize = tmf_load_chunk( demux, tivo, chunk, tivo->whichChunk );
 490       if ( readSize != CHUNKSIZE )
 491          return 0;
 492       tivo->whichChunk++;
 493    }
 494    if (AV_RB32(chunk) == TIVO_PES_FILEID)
 495       mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Skipping PART Header\n" );
 496    } while (AV_RB32(chunk) == TIVO_PES_FILEID);
 497
 498    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 499       "\nty:actual current offset %"PRIx64"\n", stream_tell( demux->stream ) -
 500       CHUNKSIZE );
 501
 502
 503    // Let's make a Video Demux Stream for MPlayer
 504    aid = 0x0;
 505    if( !demux->v_streams[ aid ] ) new_sh_video( demux, aid );
 506    if( demux->video->id == -1 ) demux->video->id = aid;
 507    if( demux->video->id == aid )
 508    {
 509       demux_stream_t *ds = demux->video;
 510       if( !ds->sh ) ds->sh = demux->v_streams[ aid ];
 511    }
 512
 513    // ======================================================================
 514    // Finally, we get to actually parse the chunk
 515    // ======================================================================
 516    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty parsing a chunk\n" );
 517    numberRecs = chunk[ 0 ];
 518    recPtr = &chunk[ 4 ];
 519    offset = numberRecs * 16 + 4;
 520    for ( counter = 0 ; counter < numberRecs ; counter++ )
 521    {
 522       int size = AV_RB24(recPtr) >> 4;
 523       int type = recPtr[ 3 ];
 524       int nybbleType = recPtr[ 2 ] & 0x0f;
 525       recordsDecoded++;
 526
 527       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 528          "ty:Record Type %x/%x %d\n", nybbleType, type, size );
 529
 530       // ================================================================
 531       // Video Parsing
 532       // ================================================================
 533       if ( type == 0xe0 )
 534       {
 535          if ( size > 0 && size + offset <= CHUNKSIZE )
 536          {
 537             int esOffset1 = demux_ty_FindESHeader( VIDEO_NAL, &chunk[ offset ],
 538                size);
 539             if ( esOffset1 != -1 )
 540                tivo->lastVideoPTS = get_ty_pts(
 541                   &chunk[ offset + esOffset1 + 9 ] );
 542
 543             // Do NOT Pass the PES Header onto the MPEG2 Decode
 544             if( nybbleType != 0x06 )
 545                demux_ty_CopyToDemuxPacket( demux->video,
 546                   &chunk[ offset ], size, demux->filepos + offset,
 547                   tivo->lastVideoPTS );
 548             offset += size;
 549          }
 550          else
 551             errorHeader++;
 552       }
 553       // ================================================================
 554       // Audio Parsing
 555       // ================================================================
 556       else if ( type == 0xc0 )
 557       {
 558          if ( size > 0 && size + offset <= CHUNKSIZE )
 559          {
 560             if( demux->audio->id == -1 )
 561             {
 562                if ( nybbleType == 0x02 )
 563                   continue;    // DTiVo inconclusive, wait for more
 564                else if ( nybbleType == 0x09 )
 565                {
 566                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting AC-3 Audio\n" );
 567                   aid = 0x80;  // AC-3
 568                }
 569                else
 570                {
 571                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting MPEG Audio\n" );
 572                   aid = 0x0;   // MPEG Audio
 573                }
 574
 575                demux->audio->id = aid;
 576                if( !demux->a_streams[ aid ] ) new_sh_audio( demux, aid );
 577                if( demux->audio->id == aid )
 578                {
 579                   demux_stream_t *ds = demux->audio;
 580                   if( !ds->sh ) {
 581                     sh_audio_t* sh_a;
 582                     ds->sh = demux->a_streams[ aid ];
 583                     sh_a = (sh_audio_t*)ds->sh;
 584                     switch(aid & 0xE0){  // 1110 0000 b  (high 3 bit: type  low 5: id)
 585                       case 0x00: sh_a->format=0x50;break; // mpeg
 586                       case 0xA0: sh_a->format=0x10001;break;  // dvd pcm
 587                       case 0x80: if((aid & 0xF8) == 0x88) sh_a->format=0x2001;//dts
 588                                   else sh_a->format=0x2000;break; // ac3
 589                     }
 590                  }
 591                }
 592             }
 593
 594             aid = demux->audio->id;
 595
 596
 597             // SA DTiVo Audio Data, no PES
 598             // ================================================
 599             if ( nybbleType == 0x02 || nybbleType == 0x04 )
 600             {
 601                if ( nybbleType == 0x02 && tivo->tivoType == 2 )
 602                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 603                else
 604                {
 605
 606                   mp_msg( MSGT_DEMUX, MSGL_DBG3,
 607                      "ty:Adding Audio Packet Size %d\n", size );
 608                   demux_ty_CopyToDemuxPacket( demux->audio,
 609                      &chunk[ offset ], size, ( demux->filepos + offset ),
 610                      tivo->lastAudioPTS );
 611                }
 612             }
 613
 614             // 3 - MPEG Audio with PES Header, either SA or DTiVo
 615             // 9 - DTiVo AC3 Audio Data with PES Header
 616             // ================================================
 617             if ( nybbleType == 0x03 || nybbleType == 0x09 )
 618             {
 619                int esOffset1, esOffset2;
 620                if ( nybbleType == 0x03 )
 621                esOffset1 = demux_ty_FindESHeader( AUDIO_NAL, &chunk[ offset ],
 622                   size);
 623
 624                // SA PES Header, No Audio Data
 625                // ================================================
 626                if ( nybbleType == 0x03 && esOffset1 == 0 && size == 16 )
 627                {
 628                   tivo->tivoType = 1;
 629                   tivo->lastAudioPTS = get_ty_pts( &chunk[ offset +
 630                      SERIES2_PTS_OFFSET ] );
 631                }
 632                else
 633                // DTiVo Audio with PES Header
 634                // ================================================
 635                {
 636                   tivo->tivoType = 2;
 637
 638                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 639                   demux_ty_FindESPacket( nybbleType == 9 ? AC3_NAL : AUDIO_NAL,
 640                      tivo->lastAudio, tivo->lastAudioEnd, &esOffset1,
 641                      &esOffset2 );
 642
 643                   if ( esOffset1 != -1 && esOffset2 != -1 )
 644                   {
 645                      int packetSize = esOffset2 - esOffset1;
 646                      int headerSize;
 647                      int ptsOffset;
 648
 649                      if ( IsValidAudioPacket( packetSize, &ptsOffset,
 650                            &headerSize ) )
 651                      {
 652                         mp_msg( MSGT_DEMUX, MSGL_DBG3,
 653                            "ty:Adding DTiVo Audio Packet Size %d\n",
 654                            packetSize );
 655
 656                         tivo->lastAudioPTS = get_ty_pts(
 657                            &tivo->lastAudio[ esOffset1 + ptsOffset ] );
 658
 659                         if (nybbleType == 9) headerSize = 0;
 660                         demux_ty_CopyToDemuxPacket
 661                         (
 662                            demux->audio,
 663                            &tivo->lastAudio[ esOffset1 + headerSize ],
 664                            packetSize - headerSize,
 665                            demux->filepos + offset,
 666                            tivo->lastAudioPTS
 667                         );
 668
 669                      }
 670
 671                      // Collapse the Audio Buffer
 672                      tivo->lastAudioEnd -= esOffset2;
 673                      memmove( &tivo->lastAudio[ 0 ],
 674                         &tivo->lastAudio[ esOffset2 ],
 675                         tivo->lastAudioEnd );
 676                   }
 677                }
 678             }
 679
 680             offset += size;
 681          }
 682          else
 683             errorHeader++;
 684       }
 685       // ================================================================
 686       // 1 = Closed Caption
 687       // 2 = Extended Data Services
 688       // ================================================================
 689       else if ( type == 0x01 || type == 0x02 )
 690       {
 691                         unsigned char lastXDS[ 16 ];
 692          int b = AV_RB24(recPtr) >> 4;
 693          b &= 0x7f7f;
 694
 695          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:%s %04x\n", type == 1 ? "CC" : "XDS", b);
 696
 697          lastXDS[ 0x00 ] = 0x00;
 698          lastXDS[ 0x01 ] = 0x00;
 699          lastXDS[ 0x02 ] = 0x01;
 700          lastXDS[ 0x03 ] = 0xb2;
 701          lastXDS[ 0x04 ] = 'T';
 702          lastXDS[ 0x05 ] = 'Y';
 703          lastXDS[ 0x06 ] = type;
 704          lastXDS[ 0x07 ] = b >> 8;
 705          lastXDS[ 0x08 ] = b;
 706          if ( subcc_enabled )
 707             demux_ty_CopyToDemuxPacket( demux->video, lastXDS, 0x09,
 708                demux->filepos + offset, tivo->lastVideoPTS );
 709       }
 710       // ================================================================
 711       // Unknown
 712       // ================================================================
 713       else
 714       {
 715          if ( size > 0 && size + offset <= CHUNKSIZE )
 716             offset += size;
 717          if (type != 3 && type != 5 && (type != 0 || size > 0)) {
 718          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Invalid Type %x\n", type );
 719          invalidType++;
 720          }
 721       }
 722      recPtr += 16;
 723    }
 724
 725    if ( errorHeader > 0 || invalidType > 0 )
 726    {
 727       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 728          "ty:Error Check - Records %d, Parsed %d, Errors %d + %d\n",
 729          numberRecs, recordsDecoded, errorHeader, invalidType );
 730
 731       // Invalid MPEG ES Size Check
 732       if ( errorHeader > numberRecs / 2 )
 733          return 0;
 734
 735       // Invalid MPEG Stream Type Check
 736       if ( invalidType > numberRecs / 2 )
 737          return 0;
 738    }
 739
 740    demux->filepos = stream_tell( demux->stream );
 741
 742    return 1;
 743 }
 744
 745 static void demux_seek_ty( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags )
 746 {
 747    demux_stream_t *d_audio = demuxer->audio;
 748    demux_stream_t *d_video = demuxer->video;
 749    sh_audio_t     *sh_audio = d_audio->sh;
 750    sh_video_t     *sh_video = d_video->sh;
 751    off_t          newpos;
 752    off_t          res;
 753    TiVoInfo       *tivo = demuxer->priv;
 754
 755    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Seeking to %7.1f\n", rel_seek_secs );
 756
 757       tivo->lastAudioEnd = 0;
 758       tivo->lastAudioPTS = MP_NOPTS_VALUE;
 759       tivo->lastVideoPTS = MP_NOPTS_VALUE;
 760    //
 761    //================= seek in MPEG ==========================
 762    demuxer->filepos = stream_tell( demuxer->stream );
 763
 764    newpos = ( flags & SEEK_ABSOLUTE ) ? demuxer->movi_start : demuxer->filepos;
 765
 766    if( flags & SEEK_FACTOR )
 767       // float seek 0..1
 768       newpos += ( demuxer->movi_end - demuxer->movi_start ) * rel_seek_secs;
 769    else
 770    {
 771       // time seek (secs)
 772       if( ! sh_video->i_bps ) // unspecified or VBR
 773          newpos += 2324 * 75 * rel_seek_secs; // 174.3 kbyte/sec
 774       else
 775          newpos += sh_video->i_bps * rel_seek_secs;
 776    }
 777
 778    if ( newpos < demuxer->movi_start )
 779    {
 780       if( demuxer->stream->type != STREAMTYPE_VCD ) demuxer->movi_start = 0;
 781       if( newpos < demuxer->movi_start ) newpos = demuxer->movi_start;
 782    }
 783
 784    res = newpos / CHUNKSIZE;
 785    if ( rel_seek_secs >= 0 )
 786       newpos = ( res + 1 ) * CHUNKSIZE;
 787    else
 788       newpos = res * CHUNKSIZE;
 789
 790    if ( newpos < 0 )
 791       newpos = 0;
 792
 793    tivo->whichChunk = newpos / CHUNKSIZE;
 794
 795    stream_seek( demuxer->stream, newpos );
 796
 797    // re-sync video:
 798    videobuf_code_len = 0; // reset ES stream buffer
 799
 800    ds_fill_buffer( d_video );
 801    if( sh_audio )
 802      ds_fill_buffer( d_audio );
 803
 804    while( 1 )
 805    {
 806      int i;
 807      if( sh_audio && !d_audio->eof && d_video->pts && d_audio->pts )
 808      {
 809         float a_pts = d_audio->pts;
 810         a_pts += ( ds_tell_pts( d_audio ) - sh_audio->a_in_buffer_len ) /
 811            (float)sh_audio->i_bps;
 812         if( d_video->pts > a_pts )
 813         {
 814            skip_audio_frame( sh_audio );  // sync audio
 815            continue;
 816         }
 817      }
 818      i = sync_video_packet( d_video );
 819      if( i == 0x1B3 || i == 0x1B8 ) break; // found it!
 820      if( !i || !skip_video_packet( d_video ) ) break; // EOF?
 821    }
 822    if ( subcc_enabled )
 823       ty_ClearOSD( 0 );
 824 }
 825
 826 static int demux_ty_control( demuxer_t *demuxer,int cmd, void *arg )
 827 {
 828    demux_stream_t *d_video = demuxer->video;
 829    sh_video_t     *sh_video = d_video->sh;
 830
 831    switch(cmd)
 832    {
 833       case DEMUXER_CTRL_GET_TIME_LENGTH:
 834          if(!sh_video->i_bps)  // unspecified or VBR
 835              return DEMUXER_CTRL_DONTKNOW;
 836          *(double *)arg=
 837             (double)demuxer->movi_end-demuxer->movi_start/sh_video->i_bps;
 838          return DEMUXER_CTRL_GUESS;
 839
 840       case DEMUXER_CTRL_GET_PERCENT_POS:
 841           return DEMUXER_CTRL_DONTKNOW;
 842        default:
 843           return DEMUXER_CTRL_NOTIMPL;
 844     }
 845 }
 846
 847
 848 static void demux_close_ty( demuxer_t *demux )
 849 {
 850    TiVoInfo         *tivo = demux->priv;
 851
 852       free( tivo );
 853       sub_justify = 0;
 854 }
 855
 856
 857 static int ty_check_file(demuxer_t* demuxer)
 858 {
 859   TiVoInfo *tivo = calloc(1, sizeof(TiVoInfo));
 860   demuxer->priv = tivo;
 861   return ds_fill_buffer(demuxer->video) ? DEMUXER_TYPE_MPEG_TY : 0;
 862 }
 863
 864
 865 static demuxer_t* demux_open_ty(demuxer_t* demuxer)
 866 {
 867     sh_audio_t *sh_audio=NULL;
 868     sh_video_t *sh_video=NULL;
 869
 870     sh_video=demuxer->video->sh;sh_video->ds=demuxer->video;
 871
 872     if(demuxer->audio->id!=-2) {
 873         if(!ds_fill_buffer(demuxer->audio)){
 874             mp_tmsg(MSGT_DEMUXER,MSGL_INFO,"MPEG: " "No audio stream found -> no sound.\n");
 875             demuxer->audio->sh=NULL;
 876         } else {
 877             sh_audio=demuxer->audio->sh;sh_audio->ds=demuxer->audio;
 878         }
 879     }
 880
 881     return demuxer;
 882 }
 883
 884
 885 const demuxer_desc_t demuxer_desc_mpeg_ty = {
 886   "TiVo demuxer",
 887   "tivo",
 888   "TiVo",
 889   "Christopher R. Wingert",
 890   "Demux streams from TiVo",
 891   DEMUXER_TYPE_MPEG_TY,
 892   0, // unsafe autodetect
 893   ty_check_file,
 894   demux_ty_fill_buffer,
 895   demux_open_ty,
 896   demux_close_ty,
 897   demux_seek_ty,
 898   demux_ty_control
 899 };