src/matroska.c

   1 /*****************************************************************************
   2  * matroska.c:
   3  *****************************************************************************
   4  * Copyright (C) 2005 x264 project
   5  * $Id: $
   6  *
   7  * Authors: Mike Matsnev
   8  *          Nathan Caldwell
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24 #include "libmkv.h"
  25 #include "matroska.h"
  26 #include "config.h"
  27
  28 int mk_seekFile(mk_Writer *w, uint64_t pos) {
  29   if (fseek(w->fp, pos, SEEK_SET))
  30     return -1;
  31
  32   w->f_pos = pos;
  33
  34   if (pos > w->f_eof)
  35     w->f_eof = pos;
  36
  37   return 0;
  38 }
  39
  40 int    mk_writeVoid(mk_Context *c, uint64_t length) {
  41   char *c_void = calloc(length, sizeof(char));
  42
  43   CHECK(mk_writeID(c, 0xec));
  44   CHECK(mk_writeSize(c, length));
  45   CHECK(mk_appendContextData(c, c_void, length));
  46   free(c_void);
  47   return 0;
  48 }
  49
  50 char  *mk_laceXiph(uint64_t *sizes, uint8_t num_frames, uint64_t *output_size) {
  51   unsigned i, j;
  52   uint64_t offset = 0;
  53   uint64_t alloc_size = num_frames * 6;  // Complete guess. We'll realloc if we need more space, though.
  54   char *laced = calloc(alloc_size, sizeof(char));
  55   if (laced == NULL)
  56     return NULL;
  57
  58   laced[offset++] = num_frames;
  59   for (i = 0; i < num_frames; i++)
  60   {
  61     for (j = sizes[i]; j >= 255 ; j -= 255)
  62     {
  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);  // Add our average + number of frames left to size
  67         if ((laced = realloc(laced, alloc_size)) == NULL)
  68           return NULL;
  69       }
  70     }
  71     laced[offset++] = j;
  72   }
  73
  74   if (output_size != NULL)
  75     *output_size = offset;
  76
  77   return laced;
  78 }
  79
  80 mk_Writer *mk_createWriter(const char *filename, int64_t timescale, uint8_t vlc_compat) {
  81   mk_Writer *w = calloc(1, sizeof(*w));
  82   if (w == NULL)
  83     return NULL;
  84
  85   w->root = mk_createContext(w, NULL, 0);
  86   if (w->root == NULL) {
  87     free(w);
  88     return NULL;
  89   }
  90
  91   if ((w->cues = mk_createContext(w, w->root, 0x1c53bb6b)) == NULL) // Cues
  92   {
  93     mk_destroyContexts(w);
  94     free(w);
  95     return NULL;
  96   }
  97
  98   w->fp = fopen(filename, "wb");
  99   if (w->fp == NULL) {
 100     mk_destroyContexts(w);
 101     free(w);
 102     return NULL;
 103   }
 104
 105   w->timescale = timescale;
 106   w->vlc_compat = vlc_compat;
 107
 108   return w;
 109 }
 110
 111 int   mk_writeHeader(mk_Writer *w, const char *writingApp) {
 112   mk_Context  *c;
 113
 114   if (w->wrote_header)
 115     return -1;
 116
 117   if ((c = mk_createContext(w, w->root, 0x1a45dfa3)) == NULL) // EBML
 118     return -1;
 119   CHECK(mk_writeUInt(c, 0x4286, 1)); // EBMLVersion
 120   CHECK(mk_writeUInt(c, 0x42f7, 1)); // EBMLReadVersion
 121   CHECK(mk_writeUInt(c, 0x42f2, 4)); // EBMLMaxIDLength
 122   CHECK(mk_writeUInt(c, 0x42f3, 8)); // EBMLMaxSizeLength
 123   CHECK(mk_writeStr(c, 0x4282, "matroska")); // DocType
 124   CHECK(mk_writeUInt(c, 0x4287, 1)); // DocTypeVersion
 125   CHECK(mk_writeUInt(c, 0x4285, 1)); // DocTypeReadversion
 126   CHECK(mk_closeContext(c, 0));
 127
 128   if ((c = mk_createContext(w, w->root, 0x18538067)) == NULL) // Segment
 129     return -1;
 130   CHECK(mk_flushContextID(c));
 131   w->segment_ptr = c->d_cur;
 132   CHECK(mk_closeContext(c, &w->segment_ptr));
 133
 134   if (w->vlc_compat)
 135   {
 136     CHECK(mk_writeVoid(w->root, 0x100));  // 256 bytes should be enough room for our Seek entries.
 137     CHECK(mk_writeVoid(w->root, 0x800)); // 2048 bytes for Chapters.
 138     CHECK(mk_writeVoid(w->root, 0x1000)); // 4096 bytes for Cues.
 139   } else
 140   {
 141     w->seek_data.seekhead = 0x80000000;
 142     CHECK(mk_writeSeek(w, &w->seekhead_ptr));
 143     w->seek_data.seekhead = 0;
 144   }
 145
 146   if ((c = mk_createContext(w, w->root, 0x1549a966)) == NULL) // SegmentInfo
 147     return -1;
 148   w->seek_data.segmentinfo = w->root->d_cur - w->segment_ptr;
 149   CHECK(mk_writeStr(c, 0x4d80, PACKAGE_STRING)); // MuxingApp
 150   CHECK(mk_writeStr(c, 0x5741, writingApp)); // WritingApp
 151   CHECK(mk_writeUInt(c, 0x2ad7b1, w->timescale)); // TimecodeScale
 152   CHECK(mk_writeFloat(c, 0x4489, 0)); // Duration
 153   w->duration_ptr = c->d_cur - 4;
 154   CHECK(mk_closeContext(c, &w->duration_ptr));
 155
 156   w->seek_data.tracks = w->root->d_cur - w->segment_ptr;
 157
 158   if (w->tracks) {
 159     CHECK(mk_closeContext(w->tracks, 0));
 160   }
 161
 162   CHECK(mk_flushContextData(w->root));
 163
 164   w->wrote_header = 1;
 165   w->def_duration = w->tracks_arr[0]->default_duration;
 166   return 0;
 167 }
 168
 169 static int mk_closeCluster(mk_Writer *w) {
 170   if (w->cluster.context == NULL)
 171     return 0;
 172   w->cluster.count++;
 173   CHECK(mk_closeContext(w->cluster.context, 0));
 174   w->cluster.context = NULL;
 175   CHECK(mk_flushContextData(w->root));
 176   return 0;
 177 }
 178
 179 int   mk_flushFrame(mk_Writer *w, mk_Track *track) {
 180   mk_Context *c, *tp;
 181   int64_t   delta, ref = 0;
 182   unsigned  fsize, bgsize;
 183   uint8_t   flags, c_delta_flags[2];
 184   int i;
 185   char *laced = NULL;
 186   uint64_t  length = 0;
 187
 188   if (!track->in_frame)
 189     return 0;
 190
 191   delta = track->frame.timecode/w->timescale - w->cluster.tc_scaled;
 192   if (delta > 32767ll || delta < -32768ll)
 193     CHECK(mk_closeCluster(w));
 194
 195   if (w->cluster.context == NULL) {
 196     w->cluster.tc_scaled = track->frame.timecode / w->timescale;
 197     w->cluster.context = mk_createContext(w, w->root, 0x1f43b675); // Cluster
 198     if (w->cluster.context == NULL)
 199       return -1;
 200
 201     w->cluster.pointer = w->f_pos - w->segment_ptr;
 202
 203     CHECK(mk_writeUInt(w->cluster.context, 0xe7, w->cluster.tc_scaled)); // Cluster Timecode
 204
 205     delta = 0;
 206     w->cluster.block_count = 0;
 207   }
 208
 209   fsize = track->frame.data ? track->frame.data->d_cur : 0;
 210   bgsize = fsize + 4 + mk_ebmlSizeSize(fsize + 4) + 1;
 211   if (!track->frame.keyframe) {
 212     ref = track->prev_frame_tc_scaled - w->cluster.tc_scaled - delta;
 213     bgsize += 1 + 1 + mk_ebmlSIntSize(ref);
 214   }
 215
 216   CHECK(mk_writeID(w->cluster.context, 0xa0)); // BlockGroup
 217   CHECK(mk_writeSize(w->cluster.context, bgsize));
 218   CHECK(mk_writeID(w->cluster.context, 0xa1)); // Block
 219
 220   switch (track->frame.lacing) {
 221     case MK_LACING_XIPH:
 222       laced = mk_laceXiph(track->frame.lacing_sizes, track->frame.lacing_num_frames, &length);
 223       break;
 224     case MK_LACING_EBML:
 225       length += mk_ebmlSizeSize(track->frame.lacing_sizes[0]) + 1;
 226       for (i = 1; i < track->frame.lacing_num_frames; i++)
 227         length += mk_ebmlSizeSize(track->frame.lacing_sizes[i] << 1);
 228       break;
 229     case MK_LACING_FIXED:
 230     {
 231       laced = calloc(1, sizeof(char));
 232       laced[0] = track->frame.lacing_num_frames;
 233       ++length;
 234     }
 235     break;
 236   }
 237
 238   CHECK(mk_writeSize(w->cluster.context, fsize + 4 + length));
 239   CHECK(mk_writeSize(w->cluster.context, track->track_id)); // track number
 240
 241   w->cluster.block_count++;
 242
 243   c_delta_flags[0] = delta >> 8;
 244   c_delta_flags[1] = delta;
 245   CHECK(mk_appendContextData(w->cluster.context, c_delta_flags, 2));
 246
 247   flags = ( track->frame.keyframe << 8 ) | track->frame.lacing;
 248   CHECK(mk_appendContextData(w->cluster.context, &flags, 1));
 249   if (track->frame.lacing) {
 250     if (track->frame.lacing == MK_LACING_EBML) {
 251       CHECK(mk_appendContextData(w->cluster.context, &track->frame.lacing_num_frames, 1));
 252       CHECK(mk_writeSize(w->cluster.context, track->frame.lacing_sizes[0]));
 253       for (i = 1; i < track->frame.lacing_num_frames; i++)
 254       {
 255         CHECK(mk_writeSSize(w->cluster.context, track->frame.lacing_sizes[i] - track->frame.lacing_sizes[i-1]));
 256       }
 257     } else if (length > 0 && laced != NULL) {
 258       CHECK(mk_appendContextData(w->cluster.context, laced, length));
 259       free(laced);
 260       laced = NULL;
 261     }
 262   }
 263
 264   if (track->frame.data) {
 265     CHECK(mk_appendContextData(w->cluster.context, track->frame.data->data, track->frame.data->d_cur));
 266     track->frame.data->d_cur = 0;
 267   }
 268   if (!track->frame.keyframe)
 269     CHECK(mk_writeSInt(w->cluster.context, 0xfb, ref)); // ReferenceBlock
 270
 271   if (track->frame.keyframe && (track->track_type & MK_TRACK_VIDEO) && (track->prev_cue_pos + 3*CLSIZE) >= w->f_pos) {
 272     if ((c = mk_createContext(w, w->cues, 0xbb)) == NULL)  // CuePoint
 273       return -1;
 274     CHECK(mk_writeUInt(c, 0xb3, track->frame.timecode)); // CueTime
 275
 276     if ((tp = mk_createContext(w, c, 0xb7)) == NULL)  // CueTrackPositions
 277       return -1;
 278     CHECK(mk_writeUInt(tp, 0xf7, track->track_id)); // CueTrack
 279     CHECK(mk_writeUInt(tp, 0xf1, w->cluster.pointer));  // CueClusterPosition
 280 //     CHECK(mk_writeUInt(c, 0x5378, w->cluster.block_count));  // CueBlockNumber
 281     CHECK(mk_closeContext(tp, 0));
 282     CHECK(mk_closeContext(c, 0));
 283   }
 284
 285   track->in_frame = 0;
 286   track->prev_frame_tc_scaled = w->cluster.tc_scaled + delta;
 287
 288   if (w->cluster.context->d_cur > CLSIZE)
 289     CHECK(mk_closeCluster(w));
 290
 291   return 0;
 292 }
 293
 294 int   mk_startFrame(mk_Writer *w, mk_Track *track) {
 295   if (mk_flushFrame(w, track) < 0)
 296     return -1;
 297
 298   track->in_frame = 1;
 299   track->frame.keyframe = 0;
 300   track->frame.lacing = MK_LACING_NONE;
 301   track->frame.lacing_num_frames = 0;
 302   track->frame.lacing_sizes = NULL;
 303
 304   return 0;
 305 }
 306
 307 int   mk_setFrameFlags(mk_Writer *w, mk_Track *track, int64_t timestamp, unsigned keyframe) {
 308   if (!track->in_frame)
 309     return -1;
 310
 311   track->frame.timecode = timestamp;
 312   track->frame.keyframe = keyframe != 0;
 313
 314   if (track->max_frame_tc < timestamp)
 315     track->max_frame_tc = timestamp;
 316
 317   return 0;
 318 }
 319
 320 int   mk_setFrameLacing(mk_Writer *w, mk_Track *track, uint8_t lacing, uint8_t num_frames, uint32_t sizes[]) {
 321   if (!track->in_frame)
 322     return -1;
 323   track->frame.lacing_sizes = calloc(num_frames, sizeof(uint32_t));
 324
 325   track->frame.lacing = lacing;
 326   track->frame.lacing_num_frames = num_frames;
 327   memcpy(track->frame.lacing_sizes, sizes, num_frames);
 328
 329   return 0;
 330 }
 331
 332 int   mk_addFrameData(mk_Writer *w, mk_Track *track, const void *data, unsigned size) {
 333   if (!track->in_frame)
 334     return -1;
 335
 336   if (track->frame.data == NULL)
 337     if ((track->frame.data = mk_createContext(w, NULL, 0)) == NULL)
 338       return -1;
 339
 340   return mk_appendContextData(track->frame.data, data, size);
 341 }
 342
 343 /* The offset of the SeekHead is returned in *pointer. */
 344 int mk_writeSeek(mk_Writer *w, int64_t *pointer) {
 345   mk_Context  *c, *s;
 346   int64_t   seekhead_ptr;
 347
 348   if ((c = mk_createContext(w, w->root, 0x114d9b74)) == NULL) // SeekHead
 349     return -1;
 350   if (pointer != NULL)
 351     seekhead_ptr = w->f_pos;
 352   if (w->seek_data.seekhead) {
 353     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 354       return -1;
 355     CHECK(mk_writeUInt(s, 0x53ab, 0x114d9b74)); // SeekID
 356     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.seekhead)); // SeekPosition
 357     CHECK(mk_closeContext(s, 0));
 358   }
 359   if (w->seek_data.segmentinfo) {
 360     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 361       return -1;
 362     CHECK(mk_writeUInt(s, 0x53ab, 0x1549a966)); // SeekID
 363     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.segmentinfo)); // SeekPosition
 364     CHECK(mk_closeContext(s, 0));
 365   }
 366   if (w->seek_data.tracks) {
 367     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 368       return -1;
 369     CHECK(mk_writeUInt(s, 0x53ab, 0x1654ae6b)); // SeekID
 370     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.tracks)); // SeekPosition
 371     CHECK(mk_closeContext(s, 0));
 372   }
 373   if (w->seek_data.cues) {
 374     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 375       return -1;
 376     CHECK(mk_writeUInt(s, 0x53ab, 0x1c53bb6b)); // SeekID
 377     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.cues)); // SeekPosition
 378     CHECK(mk_closeContext(s, 0));
 379   }
 380   if (w->seek_data.attachments) {
 381     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 382       return -1;
 383     CHECK(mk_writeUInt(s, 0x53ab, 0x1941a469)); // SeekID
 384     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.attachments)); // SeekPosition
 385     CHECK(mk_closeContext(s, 0));
 386   }
 387   if (w->seek_data.chapters) {
 388     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 389       return -1;
 390     CHECK(mk_writeUInt(s, 0x53ab, 0x1043a770)); // SeekID
 391     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.chapters)); // SeekPosition
 392     CHECK(mk_closeContext(s, 0));
 393   }
 394   if (w->seek_data.tags) {
 395     if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 396       return -1;
 397     CHECK(mk_writeUInt(s, 0x53ab, 0x1254c367)); // SeekID
 398     CHECK(mk_writeUInt(s, 0x53ac, w->seek_data.tags)); // SeekPosition
 399     CHECK(mk_closeContext(s, 0));
 400   }
 401   CHECK(mk_closeContext(c, 0));
 402
 403   if (pointer != NULL)
 404     *pointer = seekhead_ptr;
 405
 406   return 0;
 407 }
 408
 409 int   mk_close(mk_Writer *w) {
 410   int   i, ret = 0;
 411   mk_Track *tk;
 412   int64_t max_frame_tc = w->tracks_arr[0]->max_frame_tc;
 413   uint64_t segment_size = 0;
 414   unsigned char c_size[8];
 415
 416   for (i = w->num_tracks - 1; i >= 0; i--)
 417   {
 418     tk = w->tracks_arr[i];
 419     w->tracks_arr[i] = NULL;
 420     --w->num_tracks;
 421     if (mk_flushFrame(w, tk) < 0)
 422       ret = -1;
 423     free(tk);
 424     tk = NULL;
 425   }
 426
 427   if (mk_closeCluster(w) < 0)
 428     ret = -1;
 429
 430   if (w->chapters != NULL)
 431   {
 432     if (w->vlc_compat) {
 433       if (mk_seekFile(w, w->segment_ptr + 0x103) < 0)
 434         ret = -1;
 435     }
 436     w->seek_data.chapters = w->f_pos - w->segment_ptr;
 437     mk_writeChapters(w);
 438     if (w->vlc_compat) {
 439       if (mk_flushContextData(w->root) < 0)
 440         ret = -1;
 441       if (mk_writeVoid(w->root, (0x800 - (w->f_pos - w->segment_ptr))) < 0)
 442         ret = -1;
 443     }
 444     if (mk_flushContextData(w->root) < 0)
 445       ret = -1;
 446   }
 447
 448   w->seek_data.cues = w->f_pos - w->segment_ptr;
 449 //   if (w->vlc_compat) {
 450 //     if (mk_seekFile(w, w->segment_ptr + 259 + 2051) < 0)
 451 //       ret = -1;
 452 //   }
 453   if (mk_closeContext(w->cues, 0) < 0)
 454     ret = -1;
 455   if (w->vlc_compat) {
 456     if (mk_flushContextData(w->root) < 0)
 457       ret = -1;
 458     if (mk_writeVoid(w->root, (0x1000 - (w->f_pos - w->segment_ptr))) < 0)
 459       ret = -1;
 460   }
 461   if (mk_flushContextData(w->root) < 0)
 462     ret = -1;
 463
 464   if (w->wrote_header) {
 465     if (w->vlc_compat) {
 466       if (mk_seekFile(w, w->segment_ptr) < 0)
 467         ret = -1;
 468     }
 469
 470     if (mk_writeSeek(w, &w->seek_data.seekhead) < 0)
 471       ret = -1;
 472     w->seek_data.seekhead -= w->segment_ptr;
 473
 474     if (w->vlc_compat)
 475     {
 476       if (mk_flushContextData(w->root) < 0)
 477         ret = -1;
 478       if (mk_writeVoid(w->root, (256 - (w->f_pos - w->segment_ptr))) < 0)
 479         ret = -1;
 480     }
 481
 482     if (mk_flushContextData(w->root) < 0)
 483       ret = -1;
 484
 485     if (!w->vlc_compat)
 486     {
 487       int i = w->seek_data.segmentinfo;
 488       w->seek_data.segmentinfo = 0;
 489       w->seek_data.tracks = 0;
 490       w->seek_data.cues = 0;
 491       w->seek_data.chapters = 0;
 492       w->seek_data.attachments = 0;
 493       w->seek_data.tags = 0;
 494       if (mk_seekFile(w, w->segment_ptr) < 0)
 495         ret = -1;
 496       if (mk_writeSeek(w, NULL) < 0 ||
 497           mk_flushContextData(w->root) < 0)
 498         ret = -1;
 499       if (((i + w->segment_ptr) - w->f_pos - 2) > 1)
 500         if (mk_writeVoid(w->root, (i + w->segment_ptr) - w->f_pos - 2) < 0 ||
 501             mk_flushContextData(w->root) < 0)
 502           ret = -1;
 503     }
 504
 505     if (mk_seekFile(w, w->duration_ptr) < 0)
 506       ret = -1;
 507     if (mk_writeFloatRaw(w->root, (float)((double)(max_frame_tc+w->def_duration) / w->timescale)) < 0 ||
 508         mk_flushContextData(w->root) < 0)
 509       ret = -1;
 510     if (mk_seekFile(w, w->segment_ptr - 8) < 0)
 511       ret = -1;
 512     segment_size = w->f_eof - w->segment_ptr;
 513     for (i = 7; i > 0; --i)
 514       c_size[i] = segment_size >> (8 * (7-i));
 515     c_size[i] = 0x01;
 516     if (mk_appendContextData(w->root, &c_size, 8) < 0 ||
 517         mk_flushContextData(w->root) < 0)
 518       ret = -1;
 519   }
 520
 521   if (mk_closeContext(w->root, 0) < 0)
 522     ret = -1;
 523   mk_destroyContexts(w);
 524   fclose(w->fp);
 525   free(w->tracks_arr);
 526   free(w);
 527
 528   return ret;
 529 }