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 #include <sys/time.h>
  29
  30 #define RESERVED_SEEKHEAD 0x100
  31 /* 256 bytes should be enough room for our Seek entries. */
  32 #define RESERVED_CHAPTERS 0x1000
  33 /* 4096 bytes, hopefully enough for Chapters. */
  34
  35 int mk_seekFile(mk_Writer *w, uint64_t pos)
  36 {
  37         if (fseek(w->fp, pos, SEEK_SET))
  38                 return -1;
  39
  40         w->f_pos = pos;
  41
  42         if (pos > w->f_eof)
  43                 w->f_eof = pos;
  44
  45         return 0;
  46 }
  47
  48 char *mk_laceXiph(uint64_t *sizes, uint8_t num_frames,
  49                                   uint64_t *output_size)
  50 {
  51         unsigned i, j;
  52         uint64_t offset = 0;
  53         uint64_t alloc_size = num_frames * 6;   /* Complete guess. It gets realloc'd
  54                                                                                          * below if we need more space, though.
  55                                                                                          */
  56         char *laced = calloc(alloc_size, sizeof(*laced));
  57         if (laced == NULL)
  58                 return NULL;
  59
  60         laced[offset++] = num_frames;
  61         for (i = 0; i < num_frames; i++) {
  62                 for (j = sizes[i]; j >= 255; j -= 255) {
  63                         laced[offset++] = 255;
  64                         if (offset + 1 >= alloc_size) {
  65                                 int avg_sz = offset / (i - 1);  /* Compute approximate average bytes/frame */
  66                                 alloc_size += avg_sz * (num_frames - i);
  67                                                                 /* Sum average so far and number of frames left
  68                                                                  * with alloc'd size
  69                                                                  */
  70                                 if ((laced = realloc(laced, alloc_size)) == NULL)
  71                                         return NULL;
  72                         }
  73                 }
  74                 laced[offset++] = j;
  75         }
  76
  77         if (output_size != NULL)
  78                 *output_size = offset;
  79
  80         return laced;
  81 }
  82
  83 mk_Writer *mk_createWriter(const char *filename, int64_t timescale,
  84                                                    uint8_t vlc_compat)
  85 {
  86         mk_Writer *w = calloc(1, sizeof(*w));
  87         struct timeval tv;
  88
  89         if (w == NULL)
  90                 return NULL;
  91
  92         w->root = mk_createContext(w, NULL, 0);
  93         if (w->root == NULL) {
  94                 free(w);
  95                 return NULL;
  96         }
  97
  98         /* Cues */
  99         if ((w->cues = mk_createContext(w, w->root, MATROSKA_ID_CUES)) == NULL)
 100         {
 101                 mk_destroyContexts(w);
 102                 free(w);
 103                 return NULL;
 104         }
 105
 106         /* Clusters SeekHead */
 107         if ((w->cluster.seekhead = mk_createContext(w, w->root, MATROSKA_ID_SEEKHEAD)) == NULL)
 108         {
 109                 mk_destroyContexts(w);
 110                 free(w);
 111                 return NULL;
 112         }
 113
 114         w->fp = fopen(filename, "wb");
 115         if (w->fp == NULL) {
 116                 mk_destroyContexts(w);
 117                 free(w);
 118                 return NULL;
 119         }
 120
 121         gettimeofday( &tv, NULL );
 122         srandom(tv.tv_sec ^ tv.tv_usec);
 123
 124         w->timescale = timescale;
 125         w->vlc_compat = vlc_compat;
 126
 127         return w;
 128 }
 129
 130 int mk_writeHeader(mk_Writer *w, const char *writingApp)
 131 {
 132         mk_Context *c;
 133         int64_t offset = 0;
 134
 135         if (w->wrote_header)
 136                 return -1;
 137
 138         md5_starts(&w->segment_md5);    /* Initalize MD5 */
 139
 140         CHECK(mk_writeEbmlHeader(w, "matroska", MATROSKA_VERSION, MATROSKA_VERSION));
 141
 142         /* Segment */
 143         if ((c = mk_createContext(w, w->root, MATROSKA_ID_SEGMENT)) == NULL)
 144                 return -1;
 145         CHECK(mk_flushContextID(c));
 146         w->segment_ptr = c->d_cur;
 147         CHECK(mk_closeContext(c, &w->segment_ptr));
 148
 149         if (w->vlc_compat) {
 150                 CHECK(mk_writeVoid(w->root, RESERVED_SEEKHEAD));        /* Reserved space for SeekHead */
 151                 CHECK(mk_writeVoid(w->root, RESERVED_CHAPTERS));        /* Reserved space for Chapters */
 152         } else {
 153                 w->seek_data.seekhead = 0x80000000;
 154                 CHECK(mk_writeSeekHead(w, &w->seekhead_ptr));
 155                 w->seek_data.seekhead = 0;
 156         }
 157
 158         if ((c = mk_createContext(w, w->root, MATROSKA_ID_INFO)) == NULL)       /* SegmentInfo */
 159                 return -1;
 160         w->seek_data.segmentinfo = w->root->d_cur - w->segment_ptr;
 161         CHECK(mk_writeVoid(c, 16));     /* Reserve space for a SegmentUID, to be written it later. */
 162         CHECK(mk_writeStr(c, MATROSKA_ID_MUXINGAPP, PACKAGE_STRING));   /* MuxingApp */
 163         CHECK(mk_writeStr(c, MATROSKA_ID_WRITINGAPP, writingApp));      /* WritingApp */
 164         CHECK(mk_writeUInt(c, MATROSKA_ID_TIMECODESCALE, w->timescale));        /* TimecodeScale */
 165         CHECK(mk_writeFloat(c, MATROSKA_ID_DURATION, 0));       /* Duration */
 166         w->duration_ptr = c->d_cur - 4;
 167         CHECK(mk_closeContext(c, &offset));
 168         w->duration_ptr += offset;
 169         w->segmentuid_ptr = offset;
 170
 171         w->seek_data.tracks = w->root->d_cur - w->segment_ptr;
 172
 173         if (w->tracks)
 174                 CHECK(mk_closeContext(w->tracks, 0));
 175
 176         CHECK(mk_flushContextData(w->root));
 177
 178         w->wrote_header = 1;
 179         w->def_duration = w->tracks_arr[0]->default_duration;
 180         return 0;
 181 }
 182
 183 static int mk_closeCluster(mk_Writer *w)
 184 {
 185         if (w->cluster.context == NULL)
 186                 return 0;
 187         w->cluster.count++;
 188         CHECK(mk_closeContext(w->cluster.context, 0));
 189         w->cluster.context = NULL;
 190         CHECK(mk_flushContextData(w->root));
 191
 192         return 0;
 193 }
 194
 195 int mk_flushFrame(mk_Writer *w, mk_Track *track)
 196 {
 197         mk_Context *c, *tp;
 198         int64_t delta, ref = 0;
 199         unsigned fsize, bgsize;
 200         uint8_t flags, c_delta[2];
 201         int i;
 202         char *laced = NULL;
 203         uint64_t length = 0;
 204
 205         if (!track->in_frame)
 206                 return 0;
 207
 208         delta = track->frame.timecode / w->timescale - w->cluster.tc_scaled;
 209         /* If switch rapidly back-and-forth between tracks with drastically different timecodes
 210          * this causes a new cluster to be written each time a switch is made. This causes
 211          * unnecessary overhead.
 212          */
 213
 214         if (delta > 20000ll || delta < -20000ll)
 215                 CHECK(mk_closeCluster(w));
 216
 217         if (w->cluster.context == NULL) {
 218                 w->cluster.tc_scaled = track->frame.timecode / w->timescale;
 219                 /* Cluster */
 220                 w->cluster.context = mk_createContext(w, w->root, MATROSKA_ID_CLUSTER);
 221                 if (w->cluster.context == NULL)
 222                         return -1;
 223
 224                 w->cluster.pointer = w->f_pos - w->segment_ptr;
 225
 226                 /* Cluster SeekEntry */
 227                 CHECK(mk_writeSeek(w, w->cluster.seekhead, MATROSKA_ID_CLUSTER,
 228                                                    w->cluster.pointer));
 229
 230                 /* Cluster Timecode */
 231                 CHECK(mk_writeUInt(w->cluster.context, MATROSKA_ID_CLUSTERTIMECODE, w->cluster.tc_scaled));
 232
 233                 delta = 0;
 234                 w->cluster.block_count = 0;
 235         }
 236
 237         /* Calculate the encoded lacing sizes. */
 238         switch (track->frame.lacing) {
 239                 case MK_LACING_XIPH:
 240                         laced = mk_laceXiph(track->frame.lacing_sizes,
 241                                                                 track->frame.lacing_num_frames, &length);
 242                         break;
 243                 case MK_LACING_EBML:
 244                 {
 245                         uint64_t u_size = 0;
 246                         /* Add one below for the frame count. */
 247                         length += mk_ebmlSizeSize(track->frame.lacing_sizes[0]) + 1;
 248                         for (i = 1; i < track->frame.lacing_num_frames; i++) {
 249                                 u_size = llabs(track->frame.lacing_sizes[i] -
 250                                                            track->frame.lacing_sizes[i - 1]);
 251                                 /* Shift by one so we get the right size for a signed number. */
 252                                 length += mk_ebmlSizeSize((u_size) << 1);
 253                         }
 254                         break;
 255                 }
 256                 case MK_LACING_FIXED:
 257                 {
 258                         laced = calloc(1, sizeof(*laced));
 259                         laced[0] = track->frame.lacing_num_frames;
 260                         ++length;
 261                         break;
 262                 }
 263                 default:
 264                         break;
 265         }
 266
 267         fsize = track->frame.data ? track->frame.data->d_cur : 0;
 268         bgsize = fsize + 4 + mk_ebmlSizeSize(fsize + 4 + length) + 1 + length;
 269         if (!track->frame.keyframe) {
 270                 ref = track->prev_frame_tc_scaled - w->cluster.tc_scaled - delta;
 271                 bgsize += 1 + 1 + mk_ebmlSIntSize(ref);
 272         }
 273
 274         CHECK(mk_writeID(w->cluster.context, MATROSKA_ID_BLOCKGROUP));  /* BlockGroup */
 275         CHECK(mk_writeSize(w->cluster.context, bgsize));
 276         CHECK(mk_writeID(w->cluster.context, MATROSKA_ID_BLOCK));       /* Block */
 277         CHECK(mk_writeSize(w->cluster.context, fsize + 4 + length));    /* BlockSize */
 278         CHECK(mk_writeSize(w->cluster.context, track->track_id));       /* track number */
 279
 280         w->cluster.block_count++;
 281
 282         c_delta[0] = delta >> 8;
 283         c_delta[1] = delta;
 284         /* Timecode relative to Cluster. */
 285         CHECK(mk_appendContextData(w->cluster.context, c_delta, 2));
 286
 287 /*      flags = ( track->frame.keyframe << 8 ) | track->frame.lacing; */
 288         flags = track->frame.lacing << 1;       /* Flags: Bit 5-6 describe what type of lacing to use. */
 289         CHECK(mk_appendContextData(w->cluster.context, &flags, 1));
 290         if (track->frame.lacing) {
 291                 if (track->frame.lacing == MK_LACING_EBML) {
 292                         /* Number of frames in lace - 1 */
 293                         CHECK(mk_appendContextData(w->cluster.context, &track->frame.lacing_num_frames, 1));
 294                         /* Size of 1st frame. */
 295                         CHECK(mk_writeSize(w->cluster.context, track->frame.lacing_sizes[0]));
 296                         for (i = 1; i < track->frame.lacing_num_frames; i++) {
 297                                 /* Size difference between previous size and this size. */
 298                                 CHECK(mk_writeSSize(w->cluster.context, track->frame.lacing_sizes[i] - track->frame.lacing_sizes[i - 1]));
 299                         }
 300                 } else if (length > 0 && laced != NULL) {
 301                         CHECK(mk_appendContextData(w->cluster.context, laced, length));
 302                         free(laced);
 303                         laced = NULL;
 304                 }
 305         }
 306
 307         if (track->frame.data) {
 308                 CHECK(mk_appendContextData(w->cluster.context, track->frame.data->data,
 309                                                                    track->frame.data->d_cur));
 310                 track->frame.data->d_cur = 0;
 311         }
 312         if (!track->frame.keyframe)
 313                 /* ReferenceBlock */
 314                 CHECK(mk_writeSInt(w->cluster.context, MATROSKA_ID_REFERENCEBLOCK, ref));
 315
 316         /* This may get a little out of hand, but it seems sane enough for now. */
 317         if (track->frame.keyframe && (track->track_type == MK_TRACK_VIDEO)) {
 318 /*      if (track->frame.keyframe && (track->track_type & MK_TRACK_VIDEO) && ((track->prev_cue_pos + 3*CLSIZE) <= w->f_pos || track->frame.timecode == 0)) { */
 319                 /* CuePoint */
 320                 if ((c = mk_createContext(w, w->cues, MATROSKA_ID_CUEPOINT)) == NULL)
 321                         return -1;
 322                 /* CueTime */
 323                 CHECK(mk_writeUInt(c, MATROSKA_ID_CUETIME, (track->frame.timecode / w->timescale)));
 324
 325                 /* CueTrackPositions */
 326                 if ((tp = mk_createContext(w, c, MATROSKA_ID_CUETRACKPOSITIONS)) == NULL)
 327                         return -1;
 328                 /* CueTrack */
 329                 CHECK(mk_writeUInt(tp, MATROSKA_ID_CUETRACK, track->track_id));
 330                 /* CueClusterPosition */
 331                 CHECK(mk_writeUInt(tp, MATROSKA_ID_CUECLUSTERPOSITION, w->cluster.pointer));
 332                 /* CueBlockNumber */
 333 /*              CHECK(mk_writeUInt(c, MATROSKA_ID_CUEBLOCKNUMBER, w->cluster.block_count)); */
 334                 CHECK(mk_closeContext(tp, 0));
 335                 CHECK(mk_closeContext(c, 0));
 336                 track->prev_cue_pos = w->f_pos;
 337         }
 338
 339         track->in_frame = 0;
 340         track->prev_frame_tc_scaled = w->cluster.tc_scaled + delta;
 341
 342         /* Write a new Cluster ~ every 5MB */
 343         if (w->cluster.context->d_cur > 5 * CLSIZE)
 344                 CHECK(mk_closeCluster(w));
 345
 346         return 0;
 347 }
 348
 349 int mk_startFrame(mk_Writer *w, mk_Track *track)
 350 {
 351         if (mk_flushFrame(w, track) < 0)
 352                 return -1;
 353
 354         track->in_frame = 1;
 355         track->frame.keyframe = 0;
 356         track->frame.lacing = MK_LACING_NONE;
 357         track->frame.lacing_num_frames = 0;
 358         track->frame.lacing_sizes = NULL;
 359
 360         return 0;
 361 }
 362
 363 int mk_setFrameFlags(mk_Writer *w, mk_Track *track, int64_t timestamp,
 364                                          unsigned keyframe)
 365 {
 366         if (!track->in_frame)
 367                 return -1;
 368
 369         track->frame.timecode = timestamp;
 370         track->frame.keyframe = keyframe != 0;
 371
 372         if (track->max_frame_tc < timestamp)
 373                 track->max_frame_tc = timestamp;
 374
 375         return 0;
 376 }
 377
 378 int mk_setFrameLacing(mk_Writer *w, mk_Track *track,
 379                                           mk_LacingType lacing, uint8_t num_frames,
 380                                           uint64_t sizes[])
 381 {
 382         if (!track->in_frame)
 383                 return -1;
 384         track->frame.lacing_sizes = calloc(num_frames, sizeof(*sizes));
 385
 386         track->frame.lacing = lacing;
 387         track->frame.lacing_num_frames = num_frames;
 388         memcpy(track->frame.lacing_sizes, sizes,
 389                    num_frames * sizeof(*sizes));
 390
 391         return 0;
 392 }
 393
 394 int mk_addFrameData(mk_Writer *w, mk_Track *track, const void *data,
 395                                         unsigned size)
 396 {
 397         if (!track->in_frame)
 398                 return -1;
 399
 400         if (track->frame.data == NULL) {
 401                 if ((track->frame.data = mk_createContext(w, NULL, 0)) == NULL)
 402                         return -1;
 403         }
 404
 405         md5_update(&w->segment_md5, (unsigned char *) data, size);
 406
 407         return mk_appendContextData(track->frame.data, data, size);
 408 }
 409
 410 int mk_writeSeek(mk_Writer *w, mk_Context *c, unsigned seek_id,
 411                                  uint64_t seek_pos)
 412 {
 413         mk_Context *s;
 414
 415         if ((s = mk_createContext(w, c, MATROSKA_ID_SEEKENTRY)) == NULL)        /* Seek */
 416                 return -1;
 417         CHECK(mk_writeUInt(s, MATROSKA_ID_SEEKID, seek_id));    /* SeekID */
 418         CHECK(mk_writeUInt(s, MATROSKA_ID_SEEKPOSITION, seek_pos));     /* SeekPosition */
 419         CHECK(mk_closeContext(s, 0));
 420
 421         return 0;
 422 }
 423
 424 /* The offset of the SeekHead is returned in pointer. */
 425 int mk_writeSeekHead(mk_Writer *w, int64_t *pointer)
 426 {
 427         mk_Context *c;
 428         int64_t seekhead_ptr;
 429
 430         /* SeekHead */
 431         if ((c = mk_createContext(w, w->root, MATROSKA_ID_SEEKHEAD)) == NULL)
 432                 return -1;
 433         if (pointer != NULL)
 434                 seekhead_ptr = w->f_pos;
 435         if (w->seek_data.seekhead)
 436                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_SEEKHEAD, w->seek_data.seekhead));
 437         if (w->seek_data.segmentinfo)
 438                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_INFO, w->seek_data.segmentinfo));
 439         if (w->seek_data.tracks)
 440                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_TRACKS, w->seek_data.tracks));
 441         if (w->seek_data.cues)
 442                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_CUES, w->seek_data.cues));
 443         if (w->seek_data.attachments)
 444                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_ATTACHMENTS, w->seek_data.attachments));
 445         if (w->seek_data.chapters)
 446                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_CHAPTERS, w->seek_data.chapters));
 447         if (w->seek_data.tags)
 448                 CHECK(mk_writeSeek(w, c, MATROSKA_ID_TAGS, w->seek_data.tags));
 449         CHECK(mk_closeContext(c, 0));
 450
 451         if (pointer != NULL)
 452                 *pointer = seekhead_ptr;
 453
 454         return 0;
 455 }
 456
 457 int mk_close(mk_Writer *w)
 458 {
 459         int i, ret = 0;
 460         mk_Track *tk;
 461         int64_t max_frame_tc = w->tracks_arr[0]->max_frame_tc;
 462         uint64_t segment_size = 0;
 463         unsigned char c_size[8];
 464         unsigned char segment_uid[16];
 465
 466         md5_finish(&w->segment_md5, segment_uid);
 467
 468         for (i = w->num_tracks - 1; i >= 0; i--) {
 469                 tk = w->tracks_arr[i];
 470                 w->tracks_arr[i] = NULL;
 471                 --w->num_tracks;
 472                 if (mk_flushFrame(w, tk) < 0)
 473                         ret = -1;
 474                 free(tk);
 475                 tk = NULL;
 476         }
 477
 478         if (mk_closeCluster(w) < 0)
 479                 ret = -1;
 480
 481         w->seek_data.cues = w->f_pos - w->segment_ptr;
 482         if (mk_closeContext(w->cues, 0) < 0)
 483                 ret = -1;
 484         if (mk_flushContextData(w->root) < 0)
 485                 ret = -1;
 486
 487         if (w->cluster.seekhead) {
 488                 w->seek_data.seekhead = w->f_pos - w->segment_ptr;
 489                 if (mk_closeContext(w->cluster.seekhead, 0) < 0)
 490                         ret = -1;
 491                 if (mk_flushContextData(w->root) < 0)
 492                         ret = -1;
 493         }
 494
 495         if (w->attachments != NULL) {
 496                 w->seek_data.attachments = w->f_pos - w->segment_ptr;
 497                 mk_writeAttachments(w);
 498                 if (mk_flushContextData(w->root) < 0)
 499                         ret = -1;
 500         }
 501
 502         if (w->tags != NULL) {
 503                 w->seek_data.tags = w->f_pos - w->segment_ptr;
 504                 mk_writeTags(w);
 505                 if (mk_flushContextData(w->root) < 0)
 506                         ret = -1;
 507         }
 508
 509         if (w->chapters != NULL) {
 510                 if (w->vlc_compat) {
 511                         if (mk_flushContextData(w->root) < 0)
 512                                 ret = -1;
 513                         if (mk_seekFile(w, w->segment_ptr + RESERVED_SEEKHEAD + 3) < 0)
 514                                 ret = -1;
 515                 }
 516                 w->seek_data.chapters = w->f_pos - w->segment_ptr;
 517                 mk_writeChapters(w);
 518                 if (mk_flushContextData(w->root) < 0)
 519                         ret = -1;
 520                 if (w->vlc_compat) {
 521                         if (mk_writeVoid(w->root, (RESERVED_CHAPTERS - (w->f_pos - w->segment_ptr - RESERVED_SEEKHEAD - 3))) < 0)
 522                                 ret = -1;
 523                         if (mk_flushContextData(w->root) < 0)
 524                                 ret = -1;
 525                 }
 526         }
 527
 528         if (w->wrote_header) {
 529                 if (w->vlc_compat) {
 530                         if (mk_seekFile(w, w->segment_ptr) < 0)
 531                                 ret = -1;
 532                 }
 533
 534                 if (mk_writeSeekHead(w, &w->seek_data.seekhead) < 0)
 535                         ret = -1;
 536                 w->seek_data.seekhead -= w->segment_ptr;
 537
 538                 if (w->vlc_compat) {
 539                         if (mk_flushContextData(w->root) < 0)
 540                                 ret = -1;
 541                         if (mk_writeVoid(w->root, (RESERVED_SEEKHEAD - (w->f_pos - w->segment_ptr))) < 0)
 542                                 ret = -1;
 543                 }
 544
 545                 if (mk_flushContextData(w->root) < 0)
 546                         ret = -1;
 547
 548                 if (!w->vlc_compat) {
 549                         int i = w->seek_data.segmentinfo;
 550                         w->seek_data.segmentinfo = 0;
 551                         w->seek_data.tracks = 0;
 552                         w->seek_data.cues = 0;
 553                         w->seek_data.chapters = 0;
 554                         w->seek_data.attachments = 0;
 555                         w->seek_data.tags = 0;
 556                         if (mk_seekFile(w, w->segment_ptr) < 0)
 557                                 ret = -1;
 558                         if (mk_writeSeekHead(w, NULL) < 0 || mk_flushContextData(w->root) < 0)
 559                                 ret = -1;
 560                         // The conditional below is easier to understand, but incorrect
 561                         // because f_pos is unsigned and causes the lhs to be evaluated
 562                         // as an unsigned quantity.
 563                         // if (((i + w->segment_ptr) - w->f_pos - 2) > 1)
 564                         if ((i + w->segment_ptr) > (w->f_pos + 3))
 565                                 if (mk_writeVoid(w->root, (i + w->segment_ptr) - w->f_pos - 2) < 0
 566                                         || mk_flushContextData(w->root) < 0)
 567                                         ret = -1;
 568                 }
 569
 570                 if (mk_seekFile(w, w->duration_ptr) < 0)
 571                         ret = -1;
 572                 if (mk_writeFloatRaw(w->root,
 573                                                          (float) ((double) (max_frame_tc + w->def_duration) /
 574                                                          w->timescale)) < 0
 575                         || mk_flushContextData(w->root) < 0)
 576                         ret = -1;
 577                 if (mk_seekFile(w, w->segment_ptr - 8) < 0)
 578                         ret = -1;
 579                 segment_size = w->f_eof - w->segment_ptr;
 580                 for (i = 7; i > 0; --i)
 581                         c_size[i] = segment_size >> (8 * (7 - i));
 582                 c_size[i] = 0x01;
 583                 if (mk_appendContextData(w->root, &c_size, 8) < 0 ||
 584                         mk_flushContextData(w->root) < 0)
 585                         ret = -1;
 586                 if (mk_seekFile(w, w->segmentuid_ptr) < 0)
 587                         ret = -1;
 588                 if (mk_writeBin(w->root, MATROSKA_ID_SEGMENTUID, segment_uid,
 589                                                 sizeof(segment_uid)) < 0 ||
 590                         mk_flushContextData(w->root) < 0)
 591                         ret = -1;
 592         }
 593
 594         if (mk_closeContext(w->root, 0) < 0)
 595                 ret = -1;
 596         mk_destroyContexts(w);
 597         fclose(w->fp);
 598         free(w->tracks_arr);
 599         free(w);
 600
 601         return ret;
 602 }