src/matroska.c

   1 /*****************************************************************************
   2  * matroska.c:
   3  *****************************************************************************
   4  * Copyright (C) 2005 x264 project
   5  *
   6  * Authors: Mike Matsnev
   7  *          Nathan Caldwell
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23 #include "config.h"
  24 #include "libmkv.h"
  25 #include "matroska.h"
  26 #include "md5.h"
  27
  28 #define RESERVED_SEEKHEAD 0x100
  29 /* 256 bytes should be enough room for our Seek entries. */
  30 #define RESERVED_CHAPTERS 0x800
  31 /* 2048 bytes, hopefully enough for Chapters. */
  32
  33 int mk_seekFile(mk_Writer *w, uint64_t pos)
  34 {
  35         if (fseek(w->fp, pos, SEEK_SET))
  36                 return -1;
  37
  38         w->f_pos = pos;
  39
  40         if (pos > w->f_eof)
  41                 w->f_eof = pos;
  42
  43         return 0;
  44 }
  45
  46 char *mk_laceXiph(uint64_t *sizes, uint8_t num_frames,
  47                                   uint64_t *output_size)
  48 {
  49         unsigned i, j;
  50         uint64_t offset = 0;
  51         uint64_t alloc_size = num_frames * 6;   /* Complete guess. It gets realloc'd
  52                                                                                          * below if we need more space, though.
  53                                                                                          */
  54         char *laced = calloc(alloc_size, sizeof(*laced));
  55         if (laced == NULL)
  56                 return NULL;
  57
  58         laced[offset++] = num_frames;
  59         for (i = 0; i < num_frames; i++) {
  60                 for (j = sizes[i]; j >= 255; j -= 255) {
  61                         laced[offset++] = 255;
  62                         if (offset + 1 >= alloc_size) {
  63                                 int avg_sz = offset / (i - 1);  /* Compute approximate average bytes/frame */
  64                                 alloc_size += avg_sz * (num_frames - i);
  65                                                                 /* Sum average so far and number of frames left
  66                                                                  * with alloc'd size
  67                                                                  */
  68                                 if ((laced = realloc(laced, alloc_size)) == NULL)
  69                                         return NULL;
  70                         }
  71                 }
  72                 laced[offset++] = j;
  73         }
  74
  75         if (output_size != NULL)
  76                 *output_size = offset;
  77
  78         return laced;
  79 }
  80
  81 mk_Writer *mk_createWriter(const char *filename, int64_t timescale,
  82                                                    uint8_t vlc_compat)
  83 {
  84         mk_Writer *w = calloc(1, sizeof(*w));
  85         if (w == NULL)
  86                 return NULL;
  87
  88         w->root = mk_createContext(w, NULL, 0);
  89         if (w->root == NULL) {
  90                 free(w);
  91                 return NULL;
  92         }
  93
  94         /* Cues */
  95         if ((w->cues = mk_createContext(w, w->root, MATROSKA_ID_CUES)) == NULL)
  96         {
  97                 mk_destroyContexts(w);
  98                 free(w);
  99                 return NULL;
 100         }
 101
 102         /* Clusters SeekHead */
 103         if ((w->cluster.seekhead = mk_createContext(w, w->root, MATROSKA_ID_SEEKHEAD)) == NULL)
 104         {
 105                 mk_destroyContexts(w);
 106                 free(w);
 107                 return NULL;
 108         }
 109
 110         w->fp = fopen(filename, "wb");
 111         if (w->fp == NULL) {
 112                 mk_destroyContexts(w);
 113                 free(w);
 114                 return NULL;
 115         }
 116
 117         w->timescale = timescale;
 118         w->vlc_compat = vlc_compat;
 119
 120         return w;
 121 }
 122
 123 int mk_writeHeader(mk_Writer *w, const char *writingApp)
 124 {
 125         mk_Context *c;
 126         int64_t offset = 0;
 127
 128         if (w->wrote_header)
 129                 return -1;
 130
 131         md5_starts(&w->segment_md5);    /* Initalize MD5 */
 132
 133         CHECK(mk_writeEbmlHeader(w, "matroska", MATROSKA_VERSION, MATROSKA_VERSION));
 134
 135         /* Segment */
 136         if ((c = mk_createContext(w, w->root, MATROSKA_ID_SEGMENT)) == NULL)
 137                 return -1;
 138         CHECK(mk_flushContextID(c));
 139         w->segment_ptr = c->d_cur;
 140         CHECK(mk_closeContext(c, &w->segment_ptr));
 141
 142         if (w->vlc_compat) {
 143                 CHECK(mk_writeVoid(w->root, RESERVED_SEEKHEAD));        /* Reserved space for SeekHead */
 144                 CHECK(mk_writeVoid(w->root, RESERVED_CHAPTERS));        /* Reserved space for Chapters */
 145         } else {
 146                 w->seek_data.seekhead = 0x80000000;
 147                 CHECK(mk_writeSeekHead(w, &w->seekhead_ptr));
 148                 w->seek_data.seekhead = 0;
 149         }
 150
 151         if ((c = mk_createContext(w, w->root, MATROSKA_ID_INFO)) == NULL)       /* SegmentInfo */
 152                 return -1;
 153         w->seek_data.segmentinfo = w->root->d_cur - w->segment_ptr;
 154         CHECK(mk_writeVoid(c, 16));     /* Reserve space for a SegmentUID, to be written it later. */
 155         CHECK(mk_writeStr(c, MATROSKA_ID_MUXINGAPP, PACKAGE_STRING));   /* MuxingApp */
 156         CHECK(mk_writeStr(c, MATROSKA_ID_WRITINGAPP, writingApp));      /* WritingApp */
 157         CHECK(mk_writeUInt(c, MATROSKA_ID_TIMECODESCALE, w->timescale));        /* TimecodeScale */
 158         CHECK(mk_writeFloat(c, MATROSKA_ID_DURATION, 0));       /* Duration */
 159         w->duration_ptr = c->d_cur - 4;
 160         CHECK(mk_closeContext(c, &offset));
 161         w->duration_ptr += offset;
 162         w->segmentuid_ptr = offset;
 163
 164         w->seek_data.tracks = w->root->d_cur - w->segment_ptr;
 165
 166         if (w->tracks)
 167                 CHECK(mk_closeContext(w->tracks, 0));
 168
 169         CHECK(mk_flushContextData(w->root));
 170
 171         w->wrote_header = 1;
 172         w->def_duration = w->tracks_arr[0]->default_duration;
 173         return 0;
 174 }
 175
 176 static int mk_closeCluster(mk_Writer *w)
 177 {
 178         if (w->cluster.context == NULL)
 179                 return 0;
 180         w->cluster.count++;
 181         CHECK(mk_closeContext(w->cluster.context, 0));
 182         w->cluster.context = NULL;
 183         CHECK(mk_flushContextData(w->root));
 184
 185         return 0;
 186 }
 187
 188 int mk_flushFrame(mk_Writer *w, mk_Track *track)
 189 {
 190         mk_Context *c, *tp;
 191         int64_t delta, ref = 0;
 192         unsigned fsize, bgsize;
 193         uint8_t flags, c_delta[2];
 194         int i;
 195         char *laced = NULL;
 196         uint64_t length = 0;
 197         uint64_t block_duration = 0;
 198
 199         if (!track->in_frame)
 200                 return 0;
 201
 202         delta = track->frame.timecode / w->timescale - w->cluster.tc_scaled;
 203         block_duration = track->frame.duration / w->timescale;
 204         /* If switch rapidly back-and-forth between tracks with drastically different timecodes
 205          * this causes a new cluster to be written each time a switch is made. This causes
 206          * unnecessary overhead.
 207          */
 208
 209         if (delta > 20000ll || delta < -20000ll)
 210                 CHECK(mk_closeCluster(w));
 211
 212         if (w->cluster.context == NULL) {
 213                 w->cluster.tc_scaled = track->frame.timecode / w->timescale;
 214                 /* Cluster */
 215                 w->cluster.context = mk_createContext(w, w->root, MATROSKA_ID_CLUSTER);
 216                 if (w->cluster.context == NULL)
 217                         return -1;
 218
 219                 w->cluster.pointer = w->f_pos - w->segment_ptr;
 220
 221                 /* Cluster SeekEntry */
 222                 CHECK(mk_writeSeek(w, w->cluster.seekhead, MATROSKA_ID_CLUSTER,
 223                                                    w->cluster.pointer));
 224
 225                 /* Cluster Timecode */
 226                 CHECK(mk_writeUInt(w->cluster.context, MATROSKA_ID_CLUSTERTIMECODE, w->cluster.tc_scaled));
 227
 228                 delta = 0;
 229                 w->cluster.block_count = 0;
 230         }
 231
 232         /* Calculate the encoded lacing sizes. */
 233         switch (track->frame.lacing) {
 234                 case MK_LACING_XIPH:
 235                         laced = mk_laceXiph(track->frame.lacing_sizes,
 236                                                                 track->frame.lacing_num_frames, &length);
 237                         break;
 238                 case MK_LACING_EBML:
 239                 {
 240                         uint64_t u_size = 0;
 241                         /* Add one below for the frame count. */
 242                         length += mk_ebmlSizeSize(track->frame.lacing_sizes[0]) + 1;
 243                         for (i = 1; i < track->frame.lacing_num_frames; i++) {
 244                                 u_size = llabs(track->frame.lacing_sizes[i] -
 245                                                            track->frame.lacing_sizes[i - 1]);
 246                                 /* Shift by one so we get the right size for a signed number. */
 247                                 length += mk_ebmlSizeSize((u_size) << 1);
 248                         }
 249                         break;
 250                 }
 251                 case MK_LACING_FIXED:
 252                 {
 253                         laced = calloc(1, sizeof(*laced));
 254                         laced[0] = track->frame.lacing_num_frames;
 255                         ++length;
 256                         break;
 257                 }
 258                 default:
 259                         break;
 260         }
 261
 262         fsize = track->frame.data ? track->frame.data->d_cur : 0;
 263         bgsize = fsize + 4 + mk_ebmlSizeSize(fsize + 4 + length) + 1 + length;
 264         if (!track->frame.keyframe) {
 265                 ref = track->prev_frame_tc_scaled - w->cluster.tc_scaled - delta;
 266                 bgsize += 1 + 1 + mk_ebmlSIntSize(ref);
 267         }
 268         if (block_duration > 0) /* BlockDuration */
 269         {
 270                 bgsize += 1 + 1 + mk_ebmlUIntSize(block_duration);
 271         }
 272
 273         CHECK(mk_writeID(w->cluster.context, MATROSKA_ID_BLOCKGROUP));  /* BlockGroup */
 274         CHECK(mk_writeSize(w->cluster.context, bgsize));
 275         CHECK(mk_writeID(w->cluster.context, MATROSKA_ID_BLOCK));       /* Block */
 276         CHECK(mk_writeSize(w->cluster.context, fsize + 4 + length));    /* BlockSize */
 277         CHECK(mk_writeSize(w->cluster.context, track->track_id));       /* track number */
 278
 279         w->cluster.block_count++;
 280
 281         c_delta[0] = delta >> 8;
 282         c_delta[1] = delta;
 283         /* Timecode relative to Cluster. */
 284         CHECK(mk_appendContextData(w->cluster.context, c_delta, 2));
 285
 286 /*      flags = ( track->frame.keyframe << 8 ) | track->frame.lacing; */
 287         flags = track->frame.lacing << 1;       /* Flags: Bit 5-6 describe what type of lacing to use. */
 288         CHECK(mk_appendContextData(w->cluster.context, &flags, 1));
 289         if (track->frame.lacing) {
 290                 if (track->frame.lacing == MK_LACING_EBML) {
 291                         /* Number of frames in lace - 1 */
 292                         CHECK(mk_appendContextData(w->cluster.context, &track->frame.lacing_num_frames, 1));
 293                         /* Size of 1st frame. */
 294                         CHECK(mk_writeSize(w->cluster.context, track->frame.lacing_sizes[0]));
 295                         for (i = 1; i < track->frame.lacing_num_frames; i++) {
 296                                 /* Size difference between previous size and this size. */
 297                                 CHECK(mk_writeSSize(w->cluster.context, track->frame.lacing_sizes[i] - track->frame.lacing_sizes[i - 1]));
 298                         }
 299                 } else if (length > 0 && laced != NULL) {
 300                         CHECK(mk_appendContextData(w->cluster.context, laced, length));
 301                         free(laced);
 302                         laced = NULL;
 303                 }
 304         }
 305
 306         if (track->frame.data) {
 307                 CHECK(mk_appendContextData(w->cluster.context, track->frame.data->data,
 308                                                                    track->frame.data->d_cur));
 309                 track->frame.data->d_cur = 0;
 310         }
 311         if (!track->frame.keyframe)             /* ReferenceBlock */
 312                 CHECK(mk_writeSInt(w->cluster.context, MATROSKA_ID_REFERENCEBLOCK, ref));
 313
 314         if (block_duration > 0) /* BlockDuration */
 315                 CHECK(mk_writeUInt(w->cluster.context, 0x9b, block_duration));
 316
 317         /* This may get a little out of hand, but it seems sane enough for now. */
 318         if (track->frame.keyframe && (track->track_type == MK_TRACK_VIDEO)) {
 319 /*      if (track->frame.keyframe && (track->track_type & MK_TRACK_VIDEO) && ((track->prev_cue_pos + 3*CLSIZE) <= w->f_pos || track->frame.timecode == 0)) { */
 320                 /* CuePoint */
 321                 if ((c = mk_createContext(w, w->cues, MATROSKA_ID_CUEPOINT)) == NULL)
 322                         return -1;
 323                 /* CueTime */
 324                 CHECK(mk_writeUInt(c, MATROSKA_ID_CUETIME, (track->frame.timecode / w->timescale)));
 325
 326                 /* CueTrackPositions */
 327                 if ((tp = mk_createContext(w, c, MATROSKA_ID_CUETRACKPOSITIONS)) == NULL)
 328                         return -1;
 329                 /* CueTrack */
 330                 CHECK(mk_writeUInt(tp, MATROSKA_ID_CUETRACK, track->track_id));
 331                 /* CueClusterPosition */
 332                 CHECK(mk_writeUInt(tp, MATROSKA_ID_CUECLUSTERPOSITION, w->cluster.pointer));
 333                 /* CueBlockNumber */
 334 /*              CHECK(mk_writeUInt(c, MATROSKA_ID_CUEBLOCKNUMBER, w->cluster.block_count)); */
 335                 CHECK(mk_closeContext(tp, 0));
 336                 CHECK(mk_closeContext(c, 0));
 337                 track->prev_cue_pos = w->f_pos;
 338         }
 339
 340         track->in_frame = 0;
 341         track->prev_frame_tc_scaled = w->cluster.tc_scaled + delta;
 342
 343         /* Write a new Cluster ~ every 5MB */
 344         if (w->cluster.context->d_cur > 5 * CLSIZE)
 345                 CHECK(mk_closeCluster(w));
 346
 347         return 0;
 348 }
 349
 350 int mk_startFrame(mk_Writer *w, mk_Track *track)
 351 {
 352         if (mk_flushFrame(w, track) < 0)
 353                 return -1;
 354
 355         track->in_frame = 1;
 356         track->frame.keyframe = 0;
 357         track->frame.lacing = MK_LACING_NONE;
 358         track->frame.lacing_num_frames = 0;
 359         track->frame.lacing_sizes = NULL;
 360
 361         return 0;
 362 }
 363
 364 int mk_setFrameFlags(mk_Writer *w, mk_Track *track, int64_t timestamp,
 365                                          unsigned keyframe, uint64_t duration)
 366 {
 367         if (!track->in_frame)
 368                 return -1;
 369
 370         track->frame.timecode = timestamp;
 371         track->frame.keyframe = keyframe != 0;
 372
 373         if (track->max_frame_tc < timestamp)
 374                 track->max_frame_tc = timestamp;
 375
 376         if (duration > 0)
 377                 track->frame.duration = duration;
 378
 379         return 0;
 380 }
 381
 382 int mk_setFrameLacing(mk_Writer *w, mk_Track *track,
 383                                           mk_LacingType lacing, uint8_t num_frames,
 384                                           uint64_t sizes[])
 385 {
 386         if (!track->in_frame)
 387                 return -1;
 388         track->frame.lacing_sizes = calloc(num_frames, sizeof(*sizes));
 389
 390         track->frame.lacing = lacing;
 391         track->frame.lacing_num_frames = num_frames;
 392         memcpy(track->frame.lacing_sizes, sizes,
 393                    num_frames * sizeof(*sizes));
 394
 395         return 0;
 396 }
 397
 398 int mk_addFrameData(mk_Writer *w, mk_Track *track, const void *data,
 399                                         unsigned size)
 400 {
 401         if (!track->in_frame)
 402                 return -1;
 403
 404         if (track->frame.data == NULL) {
 405                 if ((track->frame.data = mk_createContext(w, NULL, 0)) == NULL)
 406                         return -1;
 407         }
 408
 409         md5_update(&w->segment_md5, (unsigned char *) data, size);
 410
 411         return mk_appendContextData(track->frame.data, data, size);
 412 }
 413
 414 int mk_writeSeek(mk_Writer *w, mk_Context *c, unsigned seek_id,
 415                                  uint64_t seek_pos)
 416 {
 417         mk_Context *s;
 418
 419         if ((s = mk_createContext(w, c, MATROSKA_ID_SEEKENTRY)) == NULL)        /* Seek */
 420                 return -1;
 421         CHECK(mk_writeUInt(s, MATROSKA_ID_SEEKID, seek_id));    /* SeekID */
 422         CHECK(mk_writeUInt(s, MATROSKA_ID_SEEKPOSITION, seek_pos));     /* SeekPosition */
 423         CHECK(mk_closeContext(s, 0));
 424
 425         return 0;
 426 }
 427
 428 /* The offset of the SeekHead is returned in pointer. */
 429 int mk_writeSeekHead(mk_Writer *w, int64_t *pointer)
 430 {
 431         mk_Context *c;
 432         int64_t seekhead_ptr;
 433
 434         /* SeekHead */
 435         if ((c = mk_createContext(w, w->root, MATROSKA_ID_SEEKHEAD)) == NULL)
 436                 return -1;
 437         if (pointer != NULL)
 438                 seekhead_ptr = w->f_pos;
 439         if (w->seek_data.seekhead)
 440                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_SEEKHEAD, w->seek_data.seekhead));
 441         if (w->seek_data.segmentinfo)
 442                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_INFO, w->seek_data.segmentinfo));
 443         if (w->seek_data.tracks)
 444                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_TRACKS, w->seek_data.tracks));
 445         if (w->seek_data.cues)
 446                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_CUES, w->seek_data.cues));
 447         if (w->seek_data.attachments)
 448                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_ATTACHMENTS, w->seek_data.attachments));
 449         if (w->seek_data.chapters)
 450                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_CHAPTERS, w->seek_data.chapters));
 451         if (w->seek_data.tags)
 452                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_TAGS, w->seek_data.tags));
 453         CHECK(mk_closeContext(c, 0));
 454
 455         if (pointer != NULL)
 456                 *pointer = seekhead_ptr;
 457
 458         return 0;
 459 }
 460
 461 int mk_close(mk_Writer *w)
 462 {
 463         int i, ret = 0;
 464         mk_Track *tk;
 465         int64_t max_frame_tc = w->tracks_arr[0]->max_frame_tc;
 466         uint64_t segment_size = 0;
 467         unsigned char c_size[8];
 468         unsigned char segment_uid[16];
 469
 470         md5_finish(&w->segment_md5, segment_uid);
 471
 472         for (i = w->num_tracks - 1; i >= 0; i--) {
 473                 tk = w->tracks_arr[i];
 474                 w->tracks_arr[i] = NULL;
 475                 --w->num_tracks;
 476                 if (mk_flushFrame(w, tk) < 0)
 477                         ret = -1;
 478                 free(tk);
 479                 tk = NULL;
 480         }
 481
 482         if (mk_closeCluster(w) < 0)
 483                 ret = -1;
 484
 485         w->seek_data.cues = w->f_pos - w->segment_ptr;
 486         if (mk_closeContext(w->cues, 0) < 0)
 487                 ret = -1;
 488         if (mk_flushContextData(w->root) < 0)
 489                 ret = -1;
 490
 491         if (w->cluster.seekhead) {
 492                 w->seek_data.seekhead = w->f_pos - w->segment_ptr;
 493                 if (mk_closeContext(w->cluster.seekhead, 0) < 0)
 494                         ret = -1;
 495                 if (mk_flushContextData(w->root) < 0)
 496                         ret = -1;
 497         }
 498
 499         if (w->chapters != NULL) {
 500                 if (w->vlc_compat) {
 501                         if (mk_flushContextData(w->root) < 0)
 502                                 ret = -1;
 503                         if (mk_seekFile(w, w->segment_ptr + RESERVED_SEEKHEAD + 3) < 0)
 504                                 ret = -1;
 505                 }
 506                 w->seek_data.chapters = w->f_pos - w->segment_ptr;
 507                 mk_writeChapters(w);
 508                 if (mk_flushContextData(w->root) < 0)
 509                         ret = -1;
 510                 if (w->vlc_compat) {
 511                         if (mk_writeVoid(w->root, (RESERVED_CHAPTERS - (w->f_pos - w->segment_ptr - RESERVED_SEEKHEAD - 3))) < 0)
 512                                 ret = -1;
 513                         if (mk_flushContextData(w->root) < 0)
 514                                 ret = -1;
 515                 }
 516         }
 517
 518         if (w->tags != NULL) {
 519                 w->seek_data.tags = w->f_pos - w->segment_ptr;
 520                 mk_writeTags(w);
 521                 if (mk_flushContextData(w->root) < 0)
 522                         ret = -1;
 523         }
 524
 525         if (w->wrote_header) {
 526                 if (w->vlc_compat) {
 527                         if (mk_seekFile(w, w->segment_ptr) < 0)
 528                                 ret = -1;
 529                 }
 530
 531                 if (mk_writeSeekHead(w, &w->seek_data.seekhead) < 0)
 532                         ret = -1;
 533                 w->seek_data.seekhead -= w->segment_ptr;
 534
 535                 if (w->vlc_compat) {
 536                         if (mk_flushContextData(w->root) < 0)
 537                                 ret = -1;
 538                         if (mk_writeVoid(w->root, (RESERVED_SEEKHEAD - (w->f_pos - w->segment_ptr))) < 0)
 539                                 ret = -1;
 540                 }
 541
 542                 if (mk_flushContextData(w->root) < 0)
 543                         ret = -1;
 544
 545                 if (!w->vlc_compat) {
 546                         int i = w->seek_data.segmentinfo;
 547                         w->seek_data.segmentinfo = 0;
 548                         w->seek_data.tracks = 0;
 549                         w->seek_data.cues = 0;
 550                         w->seek_data.chapters = 0;
 551                         w->seek_data.attachments = 0;
 552                         w->seek_data.tags = 0;
 553                         if (mk_seekFile(w, w->segment_ptr) < 0)
 554                                 ret = -1;
 555                         if (mk_writeSeekHead(w, NULL) < 0 || mk_flushContextData(w->root) < 0)
 556                                 ret = -1;
 557                         // The conditional below is easier to understand, but incorrect
 558                         // because f_pos is unsigned and causes the lhs to be evaluated
 559                         // as an unsigned quantity.
 560                         // if (((i + w->segment_ptr) - w->f_pos - 2) > 1)
 561                         if ((i + w->segment_ptr) > (w->f_pos + 3))
 562                                 if (mk_writeVoid(w->root, (i + w->segment_ptr) - w->f_pos - 2) < 0
 563                                         || mk_flushContextData(w->root) < 0)
 564                                         ret = -1;
 565                 }
 566
 567                 if (mk_seekFile(w, w->duration_ptr) < 0)
 568                         ret = -1;
 569                 if (mk_writeFloatRaw(w->root,
 570                                                          (float) ((double) (max_frame_tc + w->def_duration) /
 571                                                          w->timescale)) < 0
 572                         || mk_flushContextData(w->root) < 0)
 573                         ret = -1;
 574                 if (mk_seekFile(w, w->segment_ptr - 8) < 0)
 575                         ret = -1;
 576                 segment_size = w->f_eof - w->segment_ptr;
 577                 for (i = 7; i > 0; --i)
 578                         c_size[i] = segment_size >> (8 * (7 - i));
 579                 c_size[i] = 0x01;
 580                 if (mk_appendContextData(w->root, &c_size, 8) < 0 ||
 581                         mk_flushContextData(w->root) < 0)
 582                         ret = -1;
 583                 if (mk_seekFile(w, w->segmentuid_ptr) < 0)
 584                         ret = -1;
 585                 if (mk_writeBin(w->root, MATROSKA_ID_SEGMENTUID, segment_uid,
 586                                                 sizeof(segment_uid)) < 0 ||
 587                         mk_flushContextData(w->root) < 0)
 588                         ret = -1;
 589         }
 590
 591         if (mk_closeContext(w->root, 0) < 0)
 592                 ret = -1;
 593         mk_destroyContexts(w);
 594         fclose(w->fp);
 595         free(w->tracks_arr);
 596         free(w);
 597
 598         return ret;
 599 }