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
  54 extern int sub_justify;
  55
  56 // 2/c0: audio data
  57 // 3/c0: audio packet header (PES header)
  58 // 4/c0: audio data (S/A only?)
  59 // 9/c0: audio packet header, AC-3 audio
  60 // 2/e0: video data
  61 // 6/e0: video packet header (PES header)
  62 // 7/e0: video sequence header start
  63 // 8/e0: video I-frame header start
  64 // a/e0: video P-frame header start
  65 // b/e0: video B-frame header start
  66 // c/e0: video GOP header start
  67 // e/01: closed-caption data
  68 // e/02: Extended data services data
  69
  70
  71 #define TIVO_PES_FILEID   0xf5467abd
  72 #define TIVO_PART_LENGTH  0x20000000
  73
  74 #define CHUNKSIZE        ( 128 * 1024 )
  75 #define MAX_AUDIO_BUFFER ( 16 * 1024 )
  76
  77 #define TY_V             1
  78 #define TY_A             2
  79
  80 typedef struct
  81 {
  82    off_t startOffset;
  83    off_t fileSize;
  84    int   chunks;
  85 } tmf_fileParts;
  86
  87 #define MAX_TMF_PARTS 16
  88
  89 typedef struct
  90 {
  91    int             whichChunk;
  92    unsigned char   chunk[ CHUNKSIZE ];
  93
  94    unsigned char   lastAudio[ MAX_AUDIO_BUFFER ];
  95    int             lastAudioEnd;
  96
  97    int             tivoType;           // 1 = SA, 2 = DTiVo
  98
  99    int64_t        lastAudioPTS;
 100    int64_t        lastVideoPTS;
 101
 102    off_t           size;
 103    int             readHeader;
 104
 105    int             tmf;
 106    tmf_fileParts   tmfparts[ MAX_TMF_PARTS ];
 107    int             tmf_totalparts;
 108 } TiVoInfo;
 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    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    int              readSize;
 342
 343    int              numberRecs;
 344    unsigned char    *recPtr;
 345    int              offset;
 346
 347    int              counter;
 348
 349    int              aid;
 350
 351    TiVoInfo         *tivo = demux->priv;
 352    unsigned char    *chunk = tivo->chunk;
 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    if ( demux->stream->type == STREAMTYPE_VSTREAM )
 365    {
 366       // The vstream code figures out the exact size of the stream
 367       demux->movi_start = 0;
 368       demux->movi_end = demux->stream->end_pos;
 369       tivo->size = demux->stream->end_pos;
 370    }
 371    else
 372    {
 373       // If its a local file, try to find the Part Headers, so we can
 374       // calculate the ACTUAL stream size
 375       // If we can't find it, go off with the file size and hope the
 376       // extract program did the "right thing"
 377       if ( tivo->readHeader == 0 )
 378       {
 379          off_t filePos;
 380          tivo->readHeader = 1;
 381
 382          filePos = demux->filepos;
 383          stream_seek( demux->stream, 0 );
 384
 385          readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 386
 387          if ( memcmp( chunk, TMF_SIG, sizeof( TMF_SIG ) ) == 0 )
 388          {
 389             mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Detected a tmf\n" );
 390             tivo->tmf = 1;
 391             ty_tmf_filetoparts( demux, tivo );
 392             readSize = tmf_load_chunk( demux, tivo, chunk, 0 );
 393          }
 394
 395          if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 396          {
 397                off_t numberParts;
 398
 399                readSize = 0;
 400
 401                if ( tivo->tmf != 1 )
 402                {
 403                   off_t offset;
 404
 405                   numberParts = demux->stream->end_pos / TIVO_PART_LENGTH;
 406                   offset = numberParts * TIVO_PART_LENGTH;
 407
 408                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty/ty+Number Parts %"PRId64"\n",
 409                     (int64_t)numberParts );
 410
 411                   if ( offset + CHUNKSIZE < demux->stream->end_pos )
 412                   {
 413                      stream_seek( demux->stream, offset );
 414                      readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 415                   }
 416                }
 417                else
 418                {
 419                   numberParts = tivo->tmf_totalparts;
 420                   offset = numberParts * TIVO_PART_LENGTH;
 421                   readSize = tmf_load_chunk( demux, tivo, chunk,
 422                      numberParts * ( TIVO_PART_LENGTH - CHUNKSIZE ) /
 423                      CHUNKSIZE );
 424                }
 425
 426                if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
 427                {
 428                      int size = AV_RB24(chunk + 12);
 429                      size -= 4;
 430                      size *= CHUNKSIZE;
 431                      tivo->size = numberParts * TIVO_PART_LENGTH;
 432                      tivo->size += size;
 433                      mp_msg( MSGT_DEMUX, MSGL_DBG3,
 434                         "ty:Header Calc Stream Size %"PRId64"\n", tivo->size );
 435                }
 436          }
 437
 438          if ( demux->stream->start_pos > 0 )
 439             filePos = demux->stream->start_pos;
 440          stream_seek( demux->stream, filePos );
 441          demux->filepos = stream_tell( demux->stream );
 442          tivo->whichChunk = filePos / CHUNKSIZE;
 443       }
 444       demux->movi_start = 0;
 445       demux->movi_end = tivo->size;
 446    }
 447
 448    // ======================================================================
 449    // Give a clue as to where we are in the stream
 450    // ======================================================================
 451    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 452       "ty:ty header size %"PRIx64"\n", (int64_t)tivo->size );
 453    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 454       "ty:ty which Chunk %d\n", tivo->whichChunk );
 455    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 456       "ty:file end_pos   %"PRIx64"\n", (int64_t)demux->stream->end_pos );
 457    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 458       "\nty:wanted current offset %"PRIx64"\n", (int64_t)stream_tell( demux->stream ) );
 459
 460    if ( tivo->size > 0 && stream_tell( demux->stream ) > tivo->size )
 461    {
 462          demux->stream->eof = 1;
 463          return 0;
 464    }
 465
 466    do {
 467    if ( tivo->tmf != 1 )
 468    {
 469       // Make sure we are on a 128k boundary
 470       if ( demux->filepos % CHUNKSIZE != 0 )
 471       {
 472          int whichChunk = demux->filepos / CHUNKSIZE;
 473          if ( demux->filepos % CHUNKSIZE > CHUNKSIZE / 2 )
 474             whichChunk++;
 475          stream_seek( demux->stream, whichChunk * CHUNKSIZE );
 476       }
 477
 478       demux->filepos = stream_tell( demux->stream );
 479       tivo->whichChunk = demux->filepos / CHUNKSIZE;
 480       readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
 481       if ( readSize != CHUNKSIZE )
 482          return 0;
 483    }
 484    else
 485    {
 486       readSize = tmf_load_chunk( demux, tivo, chunk, tivo->whichChunk );
 487       if ( readSize != CHUNKSIZE )
 488          return 0;
 489       tivo->whichChunk++;
 490    }
 491    if (AV_RB32(chunk) == TIVO_PES_FILEID)
 492       mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Skipping PART Header\n" );
 493    } while (AV_RB32(chunk) == TIVO_PES_FILEID);
 494
 495    mp_msg( MSGT_DEMUX, MSGL_DBG3,
 496       "\nty:actual current offset %"PRIx64"\n", stream_tell( demux->stream ) -
 497       CHUNKSIZE );
 498
 499
 500    // Let's make a Video Demux Stream for MPlayer
 501    aid = 0x0;
 502    if( !demux->v_streams[ aid ] ) new_sh_video( demux, aid );
 503    if( demux->video->id == -1 ) demux->video->id = aid;
 504    if( demux->video->id == aid )
 505    {
 506       demux_stream_t *ds = demux->video;
 507       if( !ds->sh ) ds->sh = demux->v_streams[ aid ];
 508    }
 509
 510    // ======================================================================
 511    // Finally, we get to actually parse the chunk
 512    // ======================================================================
 513    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty parsing a chunk\n" );
 514    numberRecs = chunk[ 0 ];
 515    recPtr = &chunk[ 4 ];
 516    offset = numberRecs * 16 + 4;
 517    for ( counter = 0 ; counter < numberRecs ; counter++ )
 518    {
 519       int size = AV_RB24(recPtr) >> 4;
 520       int type = recPtr[ 3 ];
 521       int nybbleType = recPtr[ 2 ] & 0x0f;
 522       recordsDecoded++;
 523
 524       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 525          "ty:Record Type %x/%x %d\n", nybbleType, type, size );
 526
 527       // ================================================================
 528       // Video Parsing
 529       // ================================================================
 530       if ( type == 0xe0 )
 531       {
 532          if ( size > 0 && size + offset <= CHUNKSIZE )
 533          {
 534             int esOffset1 = demux_ty_FindESHeader( VIDEO_NAL, &chunk[ offset ],
 535                size);
 536             if ( esOffset1 != -1 )
 537                tivo->lastVideoPTS = get_ty_pts(
 538                   &chunk[ offset + esOffset1 + 9 ] );
 539
 540             // Do NOT Pass the PES Header onto the MPEG2 Decode
 541             if( nybbleType != 0x06 )
 542                demux_ty_CopyToDemuxPacket( demux->video,
 543                   &chunk[ offset ], size, demux->filepos + offset,
 544                   tivo->lastVideoPTS );
 545             offset += size;
 546          }
 547          else
 548             errorHeader++;
 549       }
 550       // ================================================================
 551       // Audio Parsing
 552       // ================================================================
 553       else if ( type == 0xc0 )
 554       {
 555          if ( size > 0 && size + offset <= CHUNKSIZE )
 556          {
 557             if( demux->audio->id == -1 )
 558             {
 559                if ( nybbleType == 0x02 )
 560                   continue;    // DTiVo inconclusive, wait for more
 561                else if ( nybbleType == 0x09 )
 562                {
 563                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting AC-3 Audio\n" );
 564                   aid = 0x80;  // AC-3
 565                }
 566                else
 567                {
 568                   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting MPEG Audio\n" );
 569                   aid = 0x0;   // MPEG Audio
 570                }
 571
 572                demux->audio->id = aid;
 573                if( !demux->a_streams[ aid ] ) new_sh_audio( demux, aid );
 574                if( demux->audio->id == aid )
 575                {
 576                   demux_stream_t *ds = demux->audio;
 577                   if( !ds->sh ) {
 578                     sh_audio_t* sh_a;
 579                     ds->sh = demux->a_streams[ aid ];
 580                     sh_a = (sh_audio_t*)ds->sh;
 581                     switch(aid & 0xE0){  // 1110 0000 b  (high 3 bit: type  low 5: id)
 582                       case 0x00: sh_a->format=0x50;break; // mpeg
 583                       case 0xA0: sh_a->format=0x10001;break;  // dvd pcm
 584                       case 0x80: if((aid & 0xF8) == 0x88) sh_a->format=0x2001;//dts
 585                                   else sh_a->format=0x2000;break; // ac3
 586                     }
 587                  }
 588                }
 589             }
 590
 591             aid = demux->audio->id;
 592
 593
 594             // SA DTiVo Audio Data, no PES
 595             // ================================================
 596             if ( nybbleType == 0x02 || nybbleType == 0x04 )
 597             {
 598                if ( nybbleType == 0x02 && tivo->tivoType == 2 )
 599                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 600                else
 601                {
 602
 603                   mp_msg( MSGT_DEMUX, MSGL_DBG3,
 604                      "ty:Adding Audio Packet Size %d\n", size );
 605                   demux_ty_CopyToDemuxPacket( demux->audio,
 606                      &chunk[ offset ], size, ( demux->filepos + offset ),
 607                      tivo->lastAudioPTS );
 608                }
 609             }
 610
 611             // 3 - MPEG Audio with PES Header, either SA or DTiVo
 612             // 9 - DTiVo AC3 Audio Data with PES Header
 613             // ================================================
 614             if ( nybbleType == 0x03 || nybbleType == 0x09 )
 615             {
 616                int esOffset1, esOffset2;
 617                if ( nybbleType == 0x03 )
 618                esOffset1 = demux_ty_FindESHeader( AUDIO_NAL, &chunk[ offset ],
 619                   size);
 620
 621                // SA PES Header, No Audio Data
 622                // ================================================
 623                if ( nybbleType == 0x03 && esOffset1 == 0 && size == 16 )
 624                {
 625                   tivo->tivoType = 1;
 626                   tivo->lastAudioPTS = get_ty_pts( &chunk[ offset +
 627                      SERIES2_PTS_OFFSET ] );
 628                }
 629                else
 630                // DTiVo Audio with PES Header
 631                // ================================================
 632                {
 633                   tivo->tivoType = 2;
 634
 635                   demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
 636                   demux_ty_FindESPacket( nybbleType == 9 ? AC3_NAL : AUDIO_NAL,
 637                      tivo->lastAudio, tivo->lastAudioEnd, &esOffset1,
 638                      &esOffset2 );
 639
 640                   if ( esOffset1 != -1 && esOffset2 != -1 )
 641                   {
 642                      int packetSize = esOffset2 - esOffset1;
 643                      int headerSize;
 644                      int ptsOffset;
 645
 646                      if ( IsValidAudioPacket( packetSize, &ptsOffset,
 647                            &headerSize ) )
 648                      {
 649                         mp_msg( MSGT_DEMUX, MSGL_DBG3,
 650                            "ty:Adding DTiVo Audio Packet Size %d\n",
 651                            packetSize );
 652
 653                         tivo->lastAudioPTS = get_ty_pts(
 654                            &tivo->lastAudio[ esOffset1 + ptsOffset ] );
 655
 656                         if (nybbleType == 9) headerSize = 0;
 657                         demux_ty_CopyToDemuxPacket
 658                         (
 659                            demux->audio,
 660                            &tivo->lastAudio[ esOffset1 + headerSize ],
 661                            packetSize - headerSize,
 662                            demux->filepos + offset,
 663                            tivo->lastAudioPTS
 664                         );
 665
 666                      }
 667
 668                      // Collapse the Audio Buffer
 669                      tivo->lastAudioEnd -= esOffset2;
 670                      memmove( &tivo->lastAudio[ 0 ],
 671                         &tivo->lastAudio[ esOffset2 ],
 672                         tivo->lastAudioEnd );
 673                   }
 674                }
 675             }
 676
 677             offset += size;
 678          }
 679          else
 680             errorHeader++;
 681       }
 682       // ================================================================
 683       // 1 = Closed Caption
 684       // 2 = Extended Data Services
 685       // ================================================================
 686       else if ( type == 0x01 || type == 0x02 )
 687       {
 688                         unsigned char lastXDS[ 16 ];
 689          int b = AV_RB24(recPtr) >> 4;
 690          b &= 0x7f7f;
 691
 692          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:%s %04x\n", type == 1 ? "CC" : "XDS", b);
 693
 694          lastXDS[ 0x00 ] = 0x00;
 695          lastXDS[ 0x01 ] = 0x00;
 696          lastXDS[ 0x02 ] = 0x01;
 697          lastXDS[ 0x03 ] = 0xb2;
 698          lastXDS[ 0x04 ] = 'T';
 699          lastXDS[ 0x05 ] = 'Y';
 700          lastXDS[ 0x06 ] = type;
 701          lastXDS[ 0x07 ] = b >> 8;
 702          lastXDS[ 0x08 ] = b;
 703          if ( subcc_enabled )
 704             demux_ty_CopyToDemuxPacket( demux->video, lastXDS, 0x09,
 705                demux->filepos + offset, tivo->lastVideoPTS );
 706       }
 707       // ================================================================
 708       // Unknown
 709       // ================================================================
 710       else
 711       {
 712          if ( size > 0 && size + offset <= CHUNKSIZE )
 713             offset += size;
 714          if (type != 3 && type != 5 && (type != 0 || size > 0)) {
 715          mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Invalid Type %x\n", type );
 716          invalidType++;
 717          }
 718       }
 719      recPtr += 16;
 720    }
 721
 722    if ( errorHeader > 0 || invalidType > 0 )
 723    {
 724       mp_msg( MSGT_DEMUX, MSGL_DBG3,
 725          "ty:Error Check - Records %d, Parsed %d, Errors %d + %d\n",
 726          numberRecs, recordsDecoded, errorHeader, invalidType );
 727
 728       // Invalid MPEG ES Size Check
 729       if ( errorHeader > numberRecs / 2 )
 730          return 0;
 731
 732       // Invalid MPEG Stream Type Check
 733       if ( invalidType > numberRecs / 2 )
 734          return 0;
 735    }
 736
 737    demux->filepos = stream_tell( demux->stream );
 738
 739    return 1;
 740 }
 741
 742 static void demux_seek_ty( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags )
 743 {
 744    demux_stream_t *d_audio = demuxer->audio;
 745    demux_stream_t *d_video = demuxer->video;
 746    sh_audio_t     *sh_audio = d_audio->sh;
 747    sh_video_t     *sh_video = d_video->sh;
 748    off_t          newpos;
 749    off_t          res;
 750    TiVoInfo       *tivo = demuxer->priv;
 751
 752    mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Seeking to %7.1f\n", rel_seek_secs );
 753
 754       tivo->lastAudioEnd = 0;
 755       tivo->lastAudioPTS = MP_NOPTS_VALUE;
 756       tivo->lastVideoPTS = MP_NOPTS_VALUE;
 757    //
 758    //================= seek in MPEG ==========================
 759    demuxer->filepos = stream_tell( demuxer->stream );
 760
 761    newpos = ( flags & SEEK_ABSOLUTE ) ? demuxer->movi_start : demuxer->filepos;
 762
 763    if( flags & SEEK_FACTOR )
 764       // float seek 0..1
 765       newpos += ( demuxer->movi_end - demuxer->movi_start ) * rel_seek_secs;
 766    else
 767    {
 768       // time seek (secs)
 769       if( ! sh_video->i_bps ) // unspecified or VBR
 770          newpos += 2324 * 75 * rel_seek_secs; // 174.3 kbyte/sec
 771       else
 772          newpos += sh_video->i_bps * rel_seek_secs;
 773    }
 774
 775    if ( newpos < demuxer->movi_start )
 776    {
 777       if( demuxer->stream->type != STREAMTYPE_VCD ) demuxer->movi_start = 0;
 778       if( newpos < demuxer->movi_start ) newpos = demuxer->movi_start;
 779    }
 780
 781    res = newpos / CHUNKSIZE;
 782    if ( rel_seek_secs >= 0 )
 783       newpos = ( res + 1 ) * CHUNKSIZE;
 784    else
 785       newpos = res * CHUNKSIZE;
 786
 787    if ( newpos < 0 )
 788       newpos = 0;
 789
 790    tivo->whichChunk = newpos / CHUNKSIZE;
 791
 792    stream_seek( demuxer->stream, newpos );
 793
 794    // re-sync video:
 795    videobuf_code_len = 0; // reset ES stream buffer
 796
 797    ds_fill_buffer( d_video );
 798    if( sh_audio )
 799      ds_fill_buffer( d_audio );
 800
 801    while( 1 )
 802    {
 803      int i;
 804      if( sh_audio && !d_audio->eof && d_video->pts && d_audio->pts )
 805      {
 806         float a_pts = d_audio->pts;
 807         a_pts += ( ds_tell_pts( d_audio ) - sh_audio->a_in_buffer_len ) /
 808            (float)sh_audio->i_bps;
 809         if( d_video->pts > a_pts )
 810         {
 811            skip_audio_frame( sh_audio );  // sync audio
 812            continue;
 813         }
 814      }
 815      i = sync_video_packet( d_video );
 816      if( i == 0x1B3 || i == 0x1B8 ) break; // found it!
 817      if( !i || !skip_video_packet( d_video ) ) break; // EOF?
 818    }
 819 #ifdef DEMUX_TY_OSD
 820    if ( subcc_enabled )
 821       ty_ClearOSD( 0 );
 822 #endif
 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   demuxer->filepos = 0;
 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_msg(MSGT_DEMUXER, MSGL_INFO, "MPEG: %s",
 875                    mp_gtext("No audio stream found -> no sound.\n"));
 876             demuxer->audio->sh=NULL;
 877         } else {
 878             sh_audio=demuxer->audio->sh;sh_audio->ds=demuxer->audio;
 879         }
 880     }
 881
 882     return demuxer;
 883 }
 884
 885
 886 const demuxer_desc_t demuxer_desc_mpeg_ty = {
 887   "TiVo demuxer",
 888   "tivo",
 889   "TiVo",
 890   "Christopher R. Wingert",
 891   "Demux streams from TiVo",
 892   DEMUXER_TYPE_MPEG_TY,
 893   0, // unsafe autodetect
 894   ty_check_file,
 895   demux_ty_fill_buffer,
 896   demux_open_ty,
 897   demux_close_ty,
 898   demux_seek_ty,
 899   demux_ty_control
 900 };