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     CHECK(mk_writeVoid(w->root, 0x100));  // 256 bytes should be enough room for our Seek entries.
 136     CHECK(mk_writeVoid(w->root, 0x800)); // 2048 bytes for Chapters.
 137   }
 138   else {
 139     w->seek_data.seekhead = 0x80000000;
 140     CHECK(mk_writeSeekHead(w, &w->seekhead_ptr));
 141     w->seek_data.seekhead = 0;
 142   }
 143
 144   if ((c = mk_createContext(w, w->root, 0x1549a966)) == NULL) // SegmentInfo
 145     return -1;
 146   w->seek_data.segmentinfo = w->root->d_cur - w->segment_ptr;
 147   CHECK(mk_writeStr(c, 0x4d80, PACKAGE_STRING)); // MuxingApp
 148   CHECK(mk_writeStr(c, 0x5741, writingApp)); // WritingApp
 149   CHECK(mk_writeUInt(c, 0x2ad7b1, w->timescale)); // TimecodeScale
 150   CHECK(mk_writeFloat(c, 0x4489, 0)); // Duration
 151   w->duration_ptr = c->d_cur - 4;
 152   CHECK(mk_closeContext(c, &w->duration_ptr));
 153
 154   w->seek_data.tracks = w->root->d_cur - w->segment_ptr;
 155
 156   if (w->tracks) {
 157     CHECK(mk_closeContext(w->tracks, 0));
 158   }
 159
 160   CHECK(mk_flushContextData(w->root));
 161
 162   w->wrote_header = 1;
 163   w->def_duration = w->tracks_arr[0]->default_duration;
 164   return 0;
 165 }
 166
 167 static int mk_closeCluster(mk_Writer *w) {
 168   if (w->cluster.context == NULL)
 169     return 0;
 170   w->cluster.count++;
 171   CHECK(mk_closeContext(w->cluster.context, 0));
 172   w->cluster.context = NULL;
 173   CHECK(mk_flushContextData(w->root));
 174   return 0;
 175 }
 176
 177 int   mk_flushFrame(mk_Writer *w, mk_Track *track) {
 178   mk_Context *c, *tp;
 179   int64_t   delta, ref = 0;
 180   unsigned  fsize, bgsize;
 181   uint8_t   flags, c_delta_flags[2];
 182   int i;
 183   char *laced = NULL;
 184   uint64_t  length = 0;
 185
 186   if (!track->in_frame)
 187     return 0;
 188
 189   delta = track->frame.timecode/w->timescale - w->cluster.tc_scaled;
 190   if (delta > 32767ll || delta < -32768ll)
 191     CHECK(mk_closeCluster(w));
 192
 193   if (w->cluster.context == NULL) {
 194     w->cluster.tc_scaled = track->frame.timecode / w->timescale;
 195     w->cluster.context = mk_createContext(w, w->root, 0x1f43b675); // Cluster
 196     if (w->cluster.context == NULL)
 197       return -1;
 198
 199     w->cluster.pointer = w->f_pos - w->segment_ptr;
 200
 201     CHECK(mk_writeUInt(w->cluster.context, 0xe7, w->cluster.tc_scaled)); // Cluster Timecode
 202
 203     delta = 0;
 204     w->cluster.block_count = 0;
 205   }
 206
 207   fsize = track->frame.data ? track->frame.data->d_cur : 0;
 208   bgsize = fsize + 4 + mk_ebmlSizeSize(fsize + 4) + 1;
 209   if (!track->frame.keyframe) {
 210     ref = track->prev_frame_tc_scaled - w->cluster.tc_scaled - delta;
 211     bgsize += 1 + 1 + mk_ebmlSIntSize(ref);
 212   }
 213
 214   CHECK(mk_writeID(w->cluster.context, 0xa0)); // BlockGroup
 215   CHECK(mk_writeSize(w->cluster.context, bgsize));
 216   CHECK(mk_writeID(w->cluster.context, 0xa1)); // Block
 217
 218   switch (track->frame.lacing) {
 219     case MK_LACING_XIPH:
 220       laced = mk_laceXiph(track->frame.lacing_sizes, track->frame.lacing_num_frames, &length);
 221       break;
 222     case MK_LACING_EBML:
 223       length += mk_ebmlSizeSize(track->frame.lacing_sizes[0]) + 1;
 224       for (i = 1; i < track->frame.lacing_num_frames; i++)
 225         length += mk_ebmlSizeSize(track->frame.lacing_sizes[i] << 1);
 226       break;
 227     case MK_LACING_FIXED:
 228     {
 229       laced = calloc(1, sizeof(char));
 230       laced[0] = track->frame.lacing_num_frames;
 231       ++length;
 232     }
 233     break;
 234   }
 235
 236   CHECK(mk_writeSize(w->cluster.context, fsize + 4 + length));
 237   CHECK(mk_writeSize(w->cluster.context, track->track_id)); // track number
 238
 239   w->cluster.block_count++;
 240
 241   c_delta_flags[0] = delta >> 8;
 242   c_delta_flags[1] = delta;
 243   CHECK(mk_appendContextData(w->cluster.context, c_delta_flags, 2));
 244
 245   flags = ( track->frame.keyframe << 8 ) | track->frame.lacing;
 246   CHECK(mk_appendContextData(w->cluster.context, &flags, 1));
 247   if (track->frame.lacing) {
 248     if (track->frame.lacing == MK_LACING_EBML) {
 249       CHECK(mk_appendContextData(w->cluster.context, &track->frame.lacing_num_frames, 1));
 250       CHECK(mk_writeSize(w->cluster.context, track->frame.lacing_sizes[0]));
 251       for (i = 1; i < track->frame.lacing_num_frames; i++)
 252       {
 253         CHECK(mk_writeSSize(w->cluster.context, track->frame.lacing_sizes[i] - track->frame.lacing_sizes[i-1]));
 254       }
 255     } else if (length > 0 && laced != NULL) {
 256       CHECK(mk_appendContextData(w->cluster.context, laced, length));
 257       free(laced);
 258       laced = NULL;
 259     }
 260   }
 261
 262   if (track->frame.data) {
 263     CHECK(mk_appendContextData(w->cluster.context, track->frame.data->data, track->frame.data->d_cur));
 264     track->frame.data->d_cur = 0;
 265   }
 266   if (!track->frame.keyframe)
 267     CHECK(mk_writeSInt(w->cluster.context, 0xfb, ref)); // ReferenceBlock
 268
 269   if (track->frame.keyframe && (track->track_type & MK_TRACK_VIDEO) && (track->prev_cue_pos + 3*CLSIZE) >= w->f_pos) {
 270     if ((c = mk_createContext(w, w->cues, 0xbb)) == NULL)  // CuePoint
 271       return -1;
 272     CHECK(mk_writeUInt(c, 0xb3, track->frame.timecode)); // CueTime
 273
 274     if ((tp = mk_createContext(w, c, 0xb7)) == NULL)  // CueTrackPositions
 275       return -1;
 276     CHECK(mk_writeUInt(tp, 0xf7, track->track_id)); // CueTrack
 277     CHECK(mk_writeUInt(tp, 0xf1, w->cluster.pointer));  // CueClusterPosition
 278 //     CHECK(mk_writeUInt(c, 0x5378, w->cluster.block_count));  // CueBlockNumber
 279     CHECK(mk_closeContext(tp, 0));
 280     CHECK(mk_closeContext(c, 0));
 281   }
 282
 283   track->in_frame = 0;
 284   track->prev_frame_tc_scaled = w->cluster.tc_scaled + delta;
 285
 286   if (w->cluster.context->d_cur > CLSIZE)
 287     CHECK(mk_closeCluster(w));
 288
 289   return 0;
 290 }
 291
 292 int   mk_startFrame(mk_Writer *w, mk_Track *track) {
 293   if (mk_flushFrame(w, track) < 0)
 294     return -1;
 295
 296   track->in_frame = 1;
 297   track->frame.keyframe = 0;
 298   track->frame.lacing = MK_LACING_NONE;
 299   track->frame.lacing_num_frames = 0;
 300   track->frame.lacing_sizes = NULL;
 301
 302   return 0;
 303 }
 304
 305 int   mk_setFrameFlags(mk_Writer *w, mk_Track *track, int64_t timestamp, unsigned keyframe) {
 306   if (!track->in_frame)
 307     return -1;
 308
 309   track->frame.timecode = timestamp;
 310   track->frame.keyframe = keyframe != 0;
 311
 312   if (track->max_frame_tc < timestamp)
 313     track->max_frame_tc = timestamp;
 314
 315   return 0;
 316 }
 317
 318 int   mk_setFrameLacing(mk_Writer *w, mk_Track *track, uint8_t lacing, uint8_t num_frames, uint32_t sizes[]) {
 319   if (!track->in_frame)
 320     return -1;
 321   track->frame.lacing_sizes = calloc(num_frames, sizeof(uint32_t));
 322
 323   track->frame.lacing = lacing;
 324   track->frame.lacing_num_frames = num_frames;
 325   memcpy(track->frame.lacing_sizes, sizes, num_frames);
 326
 327   return 0;
 328 }
 329
 330 int   mk_addFrameData(mk_Writer *w, mk_Track *track, const void *data, unsigned size) {
 331   if (!track->in_frame)
 332     return -1;
 333
 334   if (track->frame.data == NULL)
 335     if ((track->frame.data = mk_createContext(w, NULL, 0)) == NULL)
 336       return -1;
 337
 338   return mk_appendContextData(track->frame.data, data, size);
 339 }
 340
 341 int mk_writeSeek(mk_Write *w, mk_Context *c, unsigned seek_id, uint64_t seek_pos) {
 342   mk_Context  *s;
 343   if ((s = mk_createContext(w, c, 0x4dbb)) == NULL) // Seek
 344     return -1;
 345   CHECK(mk_writeUInt(s, 0x53ab, seek_id));  // SeekID
 346   CHECK(mk_writeUInt(s, 0x53ac, seek_pos)); // SeekPosition
 347   CHECK(mk_closeContext(s, 0));
 348
 349   return 0;
 350 }
 351
 352 /* The offset of the SeekHead is returned in *pointer. */
 353 int mk_writeSeekHead(mk_Writer *w, int64_t *pointer) {
 354   mk_Context  *c, *s;
 355   int64_t   seekhead_ptr;
 356
 357   if ((c = mk_createContext(w, w->root, 0x114d9b74)) == NULL) // SeekHead
 358     return -1;
 359   if (pointer != NULL)
 360     seekhead_ptr = w->f_pos;
 361   if (w->seek_data.seekhead)
 362     CHECK(mk_writeSeek(w, c, 0x114d9b74, w->seek_data.seekhead));
 363   if (w->seek_data.segmentinfo)
 364     CHECK(mk_writeSeek(w, c, 0x1549a966, w->seek_data.segmentinfo));
 365   if (w->seek_data.tracks)
 366     CHECK(mk_writeSeek(w, c, 0x1654ae6b, w->seek_data.tracks));
 367   if (w->seek_data.cues)
 368     CHECK(mk_writeSeek(w, c, 0x1c53bb6b, w->seek_data.cues));
 369   if (w->seek_data.attachments)
 370     CHECK(mk_writeSeek(w, c, 0x1941a469, w->seek_data.attachments));
 371   if (w->seek_data.chapters)
 372     CHECK(mk_writeSeek(w, c, 0x1043a770, w->seek_data.chapters));
 373   if (w->seek_data.tags)
 374     CHECK(mk_writeSeek(w, c, 0x1254c367, w->seek_data.tags));
 375   CHECK(mk_closeContext(c, 0));
 376
 377   if (pointer != NULL)
 378     *pointer = seekhead_ptr;
 379
 380   return 0;
 381 }
 382
 383 int   mk_close(mk_Writer *w) {
 384   int   i, ret = 0;
 385   mk_Track *tk;
 386   int64_t max_frame_tc = w->tracks_arr[0]->max_frame_tc;
 387   uint64_t segment_size = 0;
 388   unsigned char c_size[8];
 389
 390   for (i = w->num_tracks - 1; i >= 0; i--)
 391   {
 392     tk = w->tracks_arr[i];
 393     w->tracks_arr[i] = NULL;
 394     --w->num_tracks;
 395     if (mk_flushFrame(w, tk) < 0)
 396       ret = -1;
 397     free(tk);
 398     tk = NULL;
 399   }
 400
 401   if (mk_closeCluster(w) < 0)
 402     ret = -1;
 403
 404
 405   w->seek_data.cues = w->f_pos - w->segment_ptr;
 406   if (mk_closeContext(w->cues, 0) < 0)
 407     ret = -1;
 408   if (mk_flushContextData(w->root) < 0)
 409     ret = -1;
 410
 411   if (w->chapters != NULL)
 412   {
 413     if (w->vlc_compat) {
 414       if (mk_seekFile(w, w->segment_ptr + 0x103) < 0)
 415         ret = -1;
 416     }
 417     w->seek_data.chapters = w->f_pos - w->segment_ptr;
 418     mk_writeChapters(w);
 419     if (w->vlc_compat) {
 420       if (mk_flushContextData(w->root) < 0)
 421         ret = -1;
 422       if (mk_writeVoid(w->root, (0x800 - (w->f_pos - w->segment_ptr))) < 0)
 423         ret = -1;
 424     }
 425     if (mk_flushContextData(w->root) < 0)
 426       ret = -1;
 427   }
 428
 429   if (w->wrote_header) {
 430     if (w->vlc_compat) {
 431       if (mk_seekFile(w, w->segment_ptr) < 0)
 432         ret = -1;
 433     }
 434
 435     if (mk_writeSeekHead(w, &w->seek_data.seekhead) < 0)
 436       ret = -1;
 437     w->seek_data.seekhead -= w->segment_ptr;
 438
 439     if (w->vlc_compat)
 440     {
 441       if (mk_flushContextData(w->root) < 0)
 442         ret = -1;
 443       if (mk_writeVoid(w->root, (256 - (w->f_pos - w->segment_ptr))) < 0)
 444         ret = -1;
 445     }
 446
 447     if (mk_flushContextData(w->root) < 0)
 448       ret = -1;
 449
 450     if (!w->vlc_compat)
 451     {
 452       int i = w->seek_data.segmentinfo;
 453       w->seek_data.segmentinfo = 0;
 454       w->seek_data.tracks = 0;
 455       w->seek_data.cues = 0;
 456       w->seek_data.chapters = 0;
 457       w->seek_data.attachments = 0;
 458       w->seek_data.tags = 0;
 459       if (mk_seekFile(w, w->segment_ptr) < 0)
 460         ret = -1;
 461       if (mk_writeSeekHead(w, NULL) < 0 ||
 462           mk_flushContextData(w->root) < 0)
 463         ret = -1;
 464       if (((i + w->segment_ptr) - w->f_pos - 2) > 1)
 465         if (mk_writeVoid(w->root, (i + w->segment_ptr) - w->f_pos - 2) < 0 ||
 466             mk_flushContextData(w->root) < 0)
 467           ret = -1;
 468     }
 469
 470     if (mk_seekFile(w, w->duration_ptr) < 0)
 471       ret = -1;
 472     if (mk_writeFloatRaw(w->root, (float)((double)(max_frame_tc+w->def_duration) / w->timescale)) < 0 ||
 473         mk_flushContextData(w->root) < 0)
 474       ret = -1;
 475     if (mk_seekFile(w, w->segment_ptr - 8) < 0)
 476       ret = -1;
 477     segment_size = w->f_eof - w->segment_ptr;
 478     for (i = 7; i > 0; --i)
 479       c_size[i] = segment_size >> (8 * (7-i));
 480     c_size[i] = 0x01;
 481     if (mk_appendContextData(w->root, &c_size, 8) < 0 ||
 482         mk_flushContextData(w->root) < 0)
 483       ret = -1;
 484   }
 485
 486   if (mk_closeContext(w->root, 0) < 0)
 487     ret = -1;
 488   mk_destroyContexts(w);
 489   fclose(w->fp);
 490   free(w->tracks_arr);
 491   free(w);
 492
 493   return ret;
 494 }