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 <libavutil/avstring.h>
  39 #include <libavutil/intreadwrite.h>
  40
  41 #include "config.h"
  42 #include "mp_msg.h"
  43
  44 #include "libmpcodecs/dec_audio.h"
  45 #include "stream/stream.h"
  46 #include "demuxer.h"
  47 #ifdef DEMUX_TY_OSD
  48 #include "demux_ty_osd.h"
  49 #endif
  50 #include "parse_es.h"
  51 #include "stheader.h"
  52 #include "sub/sub_cc.h"
  53 #include "sub/sub.h"
  54
  55 // 2/c0: audio data
  56 // 3/c0: audio packet header (PES header)
  57 // 4/c0: audio data (S/A only?)
  58 // 9/c0: audio packet header, AC-3 audio
  59 // 2/e0: video data
  60 // 6/e0: video packet header (PES header)
  61 // 7/e0: video sequence header start
  62 // 8/e0: video I-frame header start
  63 // a/e0: video P-frame header start
  64 // b/e0: video B-frame header start
  65 // c/e0: video GOP header start
  66 // e/01: closed-caption data
  67 // e/02: Extended data services data
  68
  69
  70 #define TIVO_PES_FILEID   0xf5467abd
  71 #define TIVO_PART_LENGTH  0x20000000
  72
  73 #define CHUNKSIZE        ( 128 * 1024 )
  74 #define MAX_AUDIO_BUFFER ( 16 * 1024 )
  75
  76 #define TY_V             1
  77 #define TY_A             2
  78
  79 typedef struct
  80 {
  81    off_t startOffset;
  82    off_t fileSize;
  83    int   chunks;
  84 } tmf_fileParts;
  85
  86 #define MAX_TMF_PARTS 16
  87
  88 typedef struct
  89 {
  90    int             whichChunk;
  91    unsigned char   chunk[ CHUNKSIZE ];
  92
  93    unsigned char   lastAudio[ MAX_AUDIO_BUFFER ];
  94    int             lastAudioEnd;
  95
  96    int             tivoType;           // 1 = SA, 2 = DTiVo
  97
  98    int64_t        lastAudioPTS;
  99    int64_t        lastVideoPTS;
 100
 101    off_t           size;
 102    int             readHeader;
 103
 104    int             tmf;
 105    tmf_fileParts   tmfparts[ MAX_TMF_PARTS ];
 106    int             tmf_totalparts;
 107 } TiVoInfo;
 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    ds_add_packet( ds, dp );
 297 }
 298
 299 static int demux_ty_FindESHeader( uint8_t nal,
 300    unsigned char *buffer, int bufferSize )
 301 {
 302    uint32_t search = 0x00000100 | nal;
 303    uint32_t found = -1;
 304    uint8_t *p = buffer;
 305    uint8_t *end = p + bufferSize;
 306    while (p < end) {
 307       found <<= 8;
 308       found |= *p++;
 309       if (found == search)
 310          return p - buffer - 4;
 311    }
 312    return -1;
 313 }
 314
 315 static void demux_ty_FindESPacket( uint8_t nal,
 316    unsigned char *buffer, int bufferSize, int *esOffset1, int *esOffset2 )
 317 {
 318   *esOffset1 = demux_ty_FindESHeader(nal, buffer, bufferSize);
 319   if (*esOffset1 == -1) {
 320     *esOffset2 = -1;
 321     return;
 322   }
 323   buffer += *esOffset1 + 1;
 324   bufferSize -= *esOffset1 + 1;
 325   *esOffset2 = demux_ty_FindESHeader(nal, buffer, bufferSize);
 326   if (*esOffset2 != -1)
 327     *esOffset2 += *esOffset1 + 1;
 328 }
 329
 330 #define VIDEO_NAL 0xe0
 331 #define AUDIO_NAL 0xc0
 332 #define AC3_NAL 0xbd
 333
 334 static int demux_ty_fill_buffer( demuxer_t *demux, demux_stream_t *dsds )
 335 {
 336    int              invalidType = 0;
 337    int              errorHeader = 0;
 338    int              recordsDecoded = 0;
 339
 340    int              readSize;
 341
 342    int              numberRecs;
 343    unsigned char    *recPtr;
 344    int              offset;
 345
 346    int              counter;
 347
 348    int              aid;
 349
 350    TiVoInfo         *tivo = demux->priv;
 351    unsigned char    *chunk = tivo->chunk;
 352
 353    if ( demux->stream->type == STREAMTYPE_DVD )
 354       return 0;
 355
 356    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty processing\n" );
 357
 358    if( demux->stream->eof ) return 0;
 359
 360    // ======================================================================
 361    // If we haven't figured out the size of the stream, let's do so
 362    // ======================================================================
 363    if ( demux->stream->type == STREAMTYPE_VSTREAM )
 364    {
 365       // The vstream code figures out the exact size of the stream
 366       demux->movi_start = 0;
 367       demux->movi_end = demux->stream->end_pos;
 368       tivo->size = demux->stream->end_pos;
 369    }
 370    else
 371    {
 372       // If its a local file, try to find the Part Headers, so we can
 373       // calculate the ACTUAL stream size
 374       // If we can't find it, go off with the file size and hope the
 375       // extract program did the "right thing"
 376       if ( tivo->readHeader == 0 )
 377       {
 378          off_t filePos;
 379          tivo->readHeader = 1;
 380
 381          filePos = demux->filepos;
 382          stream_seek( demux->stream, 0 );
 383
 384          readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 385
 386          if ( memcmp( chunk, TMF_SIG, sizeof( TMF_SIG ) ) == 0 )
 387          {
 388             mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Detected a tmf\n" );
 389             tivo->tmf = 1;
 390             ty_tmf_filetoparts( demux, tivo );
 391             readSize = tmf_load_chunk( demux, tivo, chunk, 0 );
 392          }
 393
 394          if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 395          {
 396                off_t numberParts;
 397
 398                readSize = 0;
 399
 400                if ( tivo->tmf != 1 )
 401                {
 402                   off_t offset;
 403
 404                   numberParts = demux->stream->end_pos / TIVO_PART_LENGTH;
 405                   offset = numberParts * TIVO_PART_LENGTH;
 406
 407                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty/ty+Number Parts %"PRId64"\n",
 408                     (int64_t)numberParts );
 409
 410                   if ( offset + CHUNKSIZE < demux->stream->end_pos )
 411                   {
 412                      stream_seek( demux->stream, offset );
 413                      readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 414                   }
 415                }
 416                else
 417                {
 418                   numberParts = tivo->tmf_totalparts;
 419                   offset = numberParts * TIVO_PART_LENGTH;
 420                   readSize = tmf_load_chunk( demux, tivo, chunk,
 421                      numberParts * ( TIVO_PART_LENGTH - CHUNKSIZE ) /
 422                      CHUNKSIZE );
 423                }
 424
 425                if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 426                {
 427                      int size = AV_RB24(chunk + 12);
 428                      size -= 4;
 429                      size *= CHUNKSIZE;
 430                      tivo->size = numberParts * TIVO_PART_LENGTH;
 431                      tivo->size += size;
 432                      mp_msg( MSGT_DEMUX, MSGL_DBG3,
 433                         "ty:Header Calc Stream Size %"PRId64"\n", tivo->size );
 434                }
 435          }
 436
 437          if ( demux->stream->start_pos > 0 )
 438             filePos = demux->stream->start_pos;
 439          stream_seek( demux->stream, filePos );
 440          demux->filepos = stream_tell( demux->stream );
 441          tivo->whichChunk = filePos / CHUNKSIZE;
 442       }
 443       demux->movi_start = 0;
 444       demux->movi_end = tivo->size;
 445    }
 446
 447    // ======================================================================
 448    // Give a clue as to where we are in the stream
 449    // ======================================================================
 450    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 451       "ty:ty header size %"PRIx64"\n", (int64_t)tivo->size );
 452    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 453       "ty:ty which Chunk %d\n", tivo->whichChunk );
 454    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 455       "ty:file end_pos   %"PRIx64"\n", (int64_t)demux->stream->end_pos );
 456    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 457       "\nty:wanted current offset %"PRIx64"\n", (int64_t)stream_tell( demux->stream ) );
 458
 459    if ( tivo->size > 0 && stream_tell( demux->stream ) > tivo->size )
 460    {
 461          demux->stream->eof = 1;
 462          return 0;
 463    }
 464
 465    do {
 466    if ( tivo->tmf != 1 )
 467    {
 468       // Make sure we are on a 128k boundary
 469       if ( demux->filepos % CHUNKSIZE != 0 )
 470       {
 471          int whichChunk = demux->filepos / CHUNKSIZE;
 472          if ( demux->filepos % CHUNKSIZE > CHUNKSIZE / 2 )
 473             whichChunk++;
 474          stream_seek( demux->stream, whichChunk * CHUNKSIZE );
 475       }
 476
 477       demux->filepos = stream_tell( demux->stream );
 478       tivo->whichChunk = demux->filepos / CHUNKSIZE;
 479       readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 480       if ( readSize != CHUNKSIZE )
 481          return 0;
 482    }
 483    else
 484    {
 485       readSize = tmf_load_chunk( demux, tivo, chunk, tivo->whichChunk );
 486       if ( readSize != CHUNKSIZE )
 487          return 0;
 488       tivo->whichChunk++;
 489    }
 490    if (AV_RB32(chunk) == TIVO_PES_FILEID)
 491       mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Skipping PART Header\n" );
 492    } while (AV_RB32(chunk) == TIVO_PES_FILEID);
 493
 494    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 495       "\nty:actual current offset %"PRIx64"\n", stream_tell( demux->stream ) -
 496       CHUNKSIZE );
 497
 498
 499    // Let's make a Video Demux Stream for MPlayer
 500    aid = 0x0;
 501    if( !demux->v_streams[ aid ] ) new_sh_video( demux, aid );
 502    if( demux->video->id == -1 ) demux->video->id = aid;
 503    if( demux->video->id == aid )
 504    {
 505       demux_stream_t *ds = demux->video;
 506       if( !ds->sh ) ds->sh = demux->v_streams[ aid ];
 507    }
 508
 509    // ======================================================================
 510    // Finally, we get to actually parse the chunk
 511    // ======================================================================
 512    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty parsing a chunk\n" );
 513    numberRecs = chunk[ 0 ];
 514    recPtr = &chunk[ 4 ];
 515    offset = numberRecs * 16 + 4;
 516    for ( counter = 0 ; counter < numberRecs ; counter++ )
 517    {
 518       int size = AV_RB24(recPtr) >> 4;
 519       int type = recPtr[ 3 ];
 520       int nybbleType = recPtr[ 2 ] & 0x0f;
 521       recordsDecoded++;
 522
 523       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 524          "ty:Record Type %x/%x %d\n", nybbleType, type, size );
 525
 526       // ================================================================
 527       // Video Parsing
 528       // ================================================================
 529       if ( type == 0xe0 )
 530       {
 531          if ( size > 0 && size + offset <= CHUNKSIZE )
 532          {
 533             int esOffset1 = demux_ty_FindESHeader( VIDEO_NAL, &chunk[ offset ],
 534                size);
 535             if ( esOffset1 != -1 )
 536                tivo->lastVideoPTS = get_ty_pts(
 537                   &chunk[ offset + esOffset1 + 9 ] );
 538
 539             // Do NOT Pass the PES Header onto the MPEG2 Decode
 540             if( nybbleType != 0x06 )
 541                demux_ty_CopyToDemuxPacket( demux->video,
 542                   &chunk[ offset ], size, demux->filepos + offset,
 543                   tivo->lastVideoPTS );
 544             offset += size;
 545          }
 546          else
 547             errorHeader++;
 548       }
 549       // ================================================================
 550       // Audio Parsing
 551       // ================================================================
 552       else if ( type == 0xc0 )
 553       {
 554          if ( size > 0 && size + offset <= CHUNKSIZE )
 555          {
 556             if( demux->audio->id == -1 )
 557             {
 558                if ( nybbleType == 0x02 )
 559                   continue;    // DTiVo inconclusive, wait for more
 560                else if ( nybbleType == 0x09 )
 561                {
 562                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting AC-3 Audio\n" );
 563                   aid = 0x80;  // AC-3
 564                }
 565                else
 566                {
 567                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting MPEG Audio\n" );
 568                   aid = 0x0;   // MPEG Audio
 569                }
 570
 571                demux->audio->id = aid;
 572                if( !demux->a_streams[ aid ] ) new_sh_audio( demux, aid );
 573                if( demux->audio->id == aid )
 574                {
 575                   demux_stream_t *ds = demux->audio;
 576                   if( !ds->sh ) {
 577                     sh_audio_t* sh_a;
 578                     ds->sh = demux->a_streams[ aid ];
 579                     sh_a = (sh_audio_t*)ds->sh;
 580                     switch(aid & 0xE0){  // 1110 0000 b  (high 3 bit: type  low 5: id)
 581                       case 0x00: sh_a->format=0x50;break; // mpeg
 582                       case 0xA0: sh_a->format=0x10001;break;  // dvd pcm
 583                       case 0x80: if((aid & 0xF8) == 0x88) sh_a->format=0x2001;//dts
 584                                   else sh_a->format=0x2000;break; // ac3
 585                     }
 586                  }
 587                }
 588             }
 589
 590             aid = demux->audio->id;
 591
 592
 593             // SA DTiVo Audio Data, no PES
 594             // ================================================
 595             if ( nybbleType == 0x02 || nybbleType == 0x04 )
 596             {
 597                if ( nybbleType == 0x02 && tivo->tivoType == 2 )
 598                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 599                else
 600                {
 601
 602                   mp_msg( MSGT_DEMUX, MSGL_DBG3,
 603                      "ty:Adding Audio Packet Size %d\n", size );
 604                   demux_ty_CopyToDemuxPacket( demux->audio,
 605                      &chunk[ offset ], size, ( demux->filepos + offset ),
 606                      tivo->lastAudioPTS );
 607                }
 608             }
 609
 610             // 3 - MPEG Audio with PES Header, either SA or DTiVo
 611             // 9 - DTiVo AC3 Audio Data with PES Header
 612             // ================================================
 613             if ( nybbleType == 0x03 || nybbleType == 0x09 )
 614             {
 615                int esOffset1, esOffset2;
 616                if ( nybbleType == 0x03 )
 617                esOffset1 = demux_ty_FindESHeader( AUDIO_NAL, &chunk[ offset ],
 618                   size);
 619
 620                // SA PES Header, No Audio Data
 621                // ================================================
 622                if ( nybbleType == 0x03 && esOffset1 == 0 && size == 16 )
 623                {
 624                   tivo->tivoType = 1;
 625                   tivo->lastAudioPTS = get_ty_pts( &chunk[ offset +
 626                      SERIES2_PTS_OFFSET ] );
 627                }
 628                else
 629                // DTiVo Audio with PES Header
 630                // ================================================
 631                {
 632                   tivo->tivoType = 2;
 633
 634                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 635                   demux_ty_FindESPacket( nybbleType == 9 ? AC3_NAL : AUDIO_NAL,
 636                      tivo->lastAudio, tivo->lastAudioEnd, &esOffset1,
 637                      &esOffset2 );
 638
 639                   if ( esOffset1 != -1 && esOffset2 != -1 )
 640                   {
 641                      int packetSize = esOffset2 - esOffset1;
 642                      int headerSize;
 643                      int ptsOffset;
 644
 645                      if ( IsValidAudioPacket( packetSize, &ptsOffset,
 646                            &headerSize ) )
 647                      {
 648                         mp_msg( MSGT_DEMUX, MSGL_DBG3,
 649                            "ty:Adding DTiVo Audio Packet Size %d\n",
 650                            packetSize );
 651
 652                         tivo->lastAudioPTS = get_ty_pts(
 653                            &tivo->lastAudio[ esOffset1 + ptsOffset ] );
 654
 655                         if (nybbleType == 9) headerSize = 0;
 656                         demux_ty_CopyToDemuxPacket
 657                         (
 658                            demux->audio,
 659                            &tivo->lastAudio[ esOffset1 + headerSize ],
 660                            packetSize - headerSize,
 661                            demux->filepos + offset,
 662                            tivo->lastAudioPTS
 663                         );
 664
 665                      }
 666
 667                      // Collapse the Audio Buffer
 668                      tivo->lastAudioEnd -= esOffset2;
 669                      memmove( &tivo->lastAudio[ 0 ],
 670                         &tivo->lastAudio[ esOffset2 ],
 671                         tivo->lastAudioEnd );
 672                   }
 673                }
 674             }
 675
 676             offset += size;
 677          }
 678          else
 679             errorHeader++;
 680       }
 681       // ================================================================
 682       // 1 = Closed Caption
 683       // 2 = Extended Data Services
 684       // ================================================================
 685       else if ( type == 0x01 || type == 0x02 )
 686       {
 687                         unsigned char lastXDS[ 16 ];
 688          int b = AV_RB24(recPtr) >> 4;
 689          b &= 0x7f7f;
 690
 691          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:%s %04x\n", type == 1 ? "CC" : "XDS", b);
 692
 693          lastXDS[ 0x00 ] = 0x00;
 694          lastXDS[ 0x01 ] = 0x00;
 695          lastXDS[ 0x02 ] = 0x01;
 696          lastXDS[ 0x03 ] = 0xb2;
 697          lastXDS[ 0x04 ] = 'T';
 698          lastXDS[ 0x05 ] = 'Y';
 699          lastXDS[ 0x06 ] = type;
 700          lastXDS[ 0x07 ] = b >> 8;
 701          lastXDS[ 0x08 ] = b;
 702          if ( subcc_enabled )
 703             demux_ty_CopyToDemuxPacket( demux->video, lastXDS, 0x09,
 704                demux->filepos + offset, tivo->lastVideoPTS );
 705       }
 706       // ================================================================
 707       // Unknown
 708       // ================================================================
 709       else
 710       {
 711          if ( size > 0 && size + offset <= CHUNKSIZE )
 712             offset += size;
 713          if (type != 3 && type != 5 && (type != 0 || size > 0)) {
 714          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Invalid Type %x\n", type );
 715          invalidType++;
 716          }
 717       }
 718      recPtr += 16;
 719    }
 720
 721    if ( errorHeader > 0 || invalidType > 0 )
 722    {
 723       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 724          "ty:Error Check - Records %d, Parsed %d, Errors %d + %d\n",
 725          numberRecs, recordsDecoded, errorHeader, invalidType );
 726
 727       // Invalid MPEG ES Size Check
 728       if ( errorHeader > numberRecs / 2 )
 729          return 0;
 730
 731       // Invalid MPEG Stream Type Check
 732       if ( invalidType > numberRecs / 2 )
 733          return 0;
 734    }
 735
 736    demux->filepos = stream_tell( demux->stream );
 737
 738    return 1;
 739 }
 740
 741 static void demux_seek_ty( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags )
 742 {
 743    demux_stream_t *d_audio = demuxer->audio;
 744    demux_stream_t *d_video = demuxer->video;
 745    sh_audio_t     *sh_audio = d_audio->sh;
 746    sh_video_t     *sh_video = d_video->sh;
 747    off_t          newpos;
 748    off_t          res;
 749    TiVoInfo       *tivo = demuxer->priv;
 750
 751    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Seeking to %7.1f\n", rel_seek_secs );
 752
 753       tivo->lastAudioEnd = 0;
 754       tivo->lastAudioPTS = MP_NOPTS_VALUE;
 755       tivo->lastVideoPTS = MP_NOPTS_VALUE;
 756    //
 757    //================= seek in MPEG ==========================
 758    demuxer->filepos = stream_tell( demuxer->stream );
 759
 760    newpos = ( flags & SEEK_ABSOLUTE ) ? demuxer->movi_start : demuxer->filepos;
 761
 762    if( flags & SEEK_FACTOR )
 763       // float seek 0..1
 764       newpos += ( demuxer->movi_end - demuxer->movi_start ) * rel_seek_secs;
 765    else
 766    {
 767       // time seek (secs)
 768       if( ! sh_video->i_bps ) // unspecified or VBR
 769          newpos += 2324 * 75 * rel_seek_secs; // 174.3 kbyte/sec
 770       else
 771          newpos += sh_video->i_bps * rel_seek_secs;
 772    }
 773
 774    if ( newpos < demuxer->movi_start )
 775    {
 776       if( demuxer->stream->type != STREAMTYPE_VCD ) demuxer->movi_start = 0;
 777       if( newpos < demuxer->movi_start ) newpos = demuxer->movi_start;
 778    }
 779
 780    res = newpos / CHUNKSIZE;
 781    if ( rel_seek_secs >= 0 )
 782       newpos = ( res + 1 ) * CHUNKSIZE;
 783    else
 784       newpos = res * CHUNKSIZE;
 785
 786    if ( newpos < 0 )
 787       newpos = 0;
 788
 789    tivo->whichChunk = newpos / CHUNKSIZE;
 790
 791    stream_seek( demuxer->stream, newpos );
 792
 793    // re-sync video:
 794    videobuf_code_len = 0; // reset ES stream buffer
 795
 796    ds_fill_buffer( d_video );
 797    if( sh_audio )
 798      ds_fill_buffer( d_audio );
 799
 800    while( 1 )
 801    {
 802      int i;
 803      if( sh_audio && !d_audio->eof && d_video->pts && d_audio->pts )
 804      {
 805         float a_pts = d_audio->pts;
 806         a_pts += ( ds_tell_pts( d_audio ) - sh_audio->a_in_buffer_len ) /
 807            (float)sh_audio->i_bps;
 808         if( d_video->pts > a_pts )
 809         {
 810            skip_audio_frame( sh_audio );  // sync audio
 811            continue;
 812         }
 813      }
 814      i = sync_video_packet( d_video );
 815      if( i == 0x1B3 || i == 0x1B8 ) break; // found it!
 816      if( !i || !skip_video_packet( d_video ) ) break; // EOF?
 817    }
 818 #ifdef DEMUX_TY_OSD
 819    if ( subcc_enabled )
 820       ty_ClearOSD( 0 );
 821 #endif
 822 }
 823
 824 static int demux_ty_control( demuxer_t *demuxer,int cmd, void *arg )
 825 {
 826    demux_stream_t *d_video = demuxer->video;
 827    sh_video_t     *sh_video = d_video->sh;
 828
 829    switch(cmd)
 830    {
 831       case DEMUXER_CTRL_GET_TIME_LENGTH:
 832          if(!sh_video->i_bps)  // unspecified or VBR
 833              return DEMUXER_CTRL_DONTKNOW;
 834          *(double *)arg=
 835             (double)demuxer->movi_end-demuxer->movi_start/sh_video->i_bps;
 836          return DEMUXER_CTRL_GUESS;
 837
 838       case DEMUXER_CTRL_GET_PERCENT_POS:
 839           return DEMUXER_CTRL_DONTKNOW;
 840        default:
 841           return DEMUXER_CTRL_NOTIMPL;
 842     }
 843 }
 844
 845
 846 static void demux_close_ty( demuxer_t *demux )
 847 {
 848    TiVoInfo         *tivo = demux->priv;
 849
 850       free( tivo );
 851       sub_justify = 0;
 852 }
 853
 854
 855 static int ty_check_file(demuxer_t* demuxer)
 856 {
 857   demuxer->filepos = 0;
 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_msg(MSGT_DEMUXER, MSGL_INFO, "MPEG: %s",
 874                    mp_gtext("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 };