matroska.c

   1 /*****************************************************************************
   2  * matroska.c:
   3  *****************************************************************************
   4  * Copyright (C) 2005 Mike Matsnev
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  19  *****************************************************************************/
  20
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include "common/osdep.h"
  24 #include "matroska.h"
  25
  26 #define CLSIZE    1048576
  27 #define CHECK(x)  do { if ((x) < 0) return -1; } while (0)
  28
  29 struct mk_Context {
  30   struct mk_Context *next, **prev, *parent;
  31   struct mk_Writer  *owner;
  32   unsigned          id;
  33
  34   void              *data;
  35   unsigned          d_cur, d_max;
  36 };
  37
  38 typedef struct mk_Context mk_Context;
  39
  40 struct mk_Writer {
  41   FILE                *fp;
  42
  43   unsigned            duration_ptr;
  44
  45   mk_Context          *root, *cluster, *frame;
  46   mk_Context          *freelist;
  47   mk_Context          *actlist;
  48
  49   int64_t             def_duration;
  50   int64_t             timescale;
  51   int64_t             cluster_tc_scaled;
  52   int64_t             frame_tc, prev_frame_tc_scaled, max_frame_tc;
  53
  54   char                wrote_header, in_frame, keyframe;
  55 };
  56
  57 static mk_Context *mk_createContext(mk_Writer *w, mk_Context *parent, unsigned id) {
  58   mk_Context  *c;
  59
  60   if (w->freelist) {
  61     c = w->freelist;
  62     w->freelist = w->freelist->next;
  63   } else {
  64     c = malloc(sizeof(*c));
  65     memset(c, 0, sizeof(*c));
  66   }
  67
  68   if (c == NULL)
  69     return NULL;
  70
  71   c->parent = parent;
  72   c->owner = w;
  73   c->id = id;
  74
  75   if (c->owner->actlist)
  76     c->owner->actlist->prev = &c->next;
  77   c->next = c->owner->actlist;
  78   c->prev = &c->owner->actlist;
  79   c->owner->actlist = c;
  80
  81   return c;
  82 }
  83
  84 static int        mk_appendContextData(mk_Context *c, const void *data, unsigned size) {
  85   unsigned  ns = c->d_cur + size;
  86
  87   if (ns > c->d_max) {
  88     void      *dp;
  89     unsigned  dn = c->d_max ? c->d_max << 1 : 16;
  90     while (ns > dn)
  91       dn <<= 1;
  92
  93     dp = realloc(c->data, dn);
  94     if (dp == NULL)
  95       return -1;
  96
  97     c->data = dp;
  98     c->d_max = dn;
  99   }
 100
 101   memcpy((char*)c->data + c->d_cur, data, size);
 102
 103   c->d_cur = ns;
 104
 105   return 0;
 106 }
 107
 108 static int        mk_writeID(mk_Context *c, unsigned id) {
 109   unsigned char   c_id[4] = { id >> 24, id >> 16, id >> 8, id };
 110
 111   if (c_id[0])
 112     return mk_appendContextData(c, c_id, 4);
 113   if (c_id[1])
 114     return mk_appendContextData(c, c_id+1, 3);
 115   if (c_id[2])
 116     return mk_appendContextData(c, c_id+2, 2);
 117   return mk_appendContextData(c, c_id+3, 1);
 118 }
 119
 120 static int        mk_writeSize(mk_Context *c, unsigned size) {
 121   unsigned char   c_size[5] = { 0x08, size >> 24, size >> 16, size >> 8, size };
 122
 123   if (size < 0x7f) {
 124     c_size[4] |= 0x80;
 125     return mk_appendContextData(c, c_size+4, 1);
 126   }
 127   if (size < 0x3fff) {
 128     c_size[3] |= 0x40;
 129     return mk_appendContextData(c, c_size+3, 2);
 130   }
 131   if (size < 0x1fffff) {
 132     c_size[2] |= 0x20;
 133     return mk_appendContextData(c, c_size+2, 3);
 134   }
 135   if (size < 0x0fffffff) {
 136     c_size[1] |= 0x10;
 137     return mk_appendContextData(c, c_size+1, 4);
 138   }
 139   return mk_appendContextData(c, c_size, 5);
 140 }
 141
 142 static int        mk_flushContextID(mk_Context *c) {
 143   unsigned char ff = 0xff;
 144
 145   if (c->id == 0)
 146     return 0;
 147
 148   CHECK(mk_writeID(c->parent, c->id));
 149   CHECK(mk_appendContextData(c->parent, &ff, 1));
 150
 151   c->id = 0;
 152
 153   return 0;
 154 }
 155
 156 static int        mk_flushContextData(mk_Context *c) {
 157   if (c->d_cur == 0)
 158     return 0;
 159
 160   if (c->parent)
 161     CHECK(mk_appendContextData(c->parent, c->data, c->d_cur));
 162   else
 163     if (fwrite(c->data, c->d_cur, 1, c->owner->fp) != 1)
 164       return -1;
 165
 166   c->d_cur = 0;
 167
 168   return 0;
 169 }
 170
 171 static int        mk_closeContext(mk_Context *c, unsigned *off) {
 172   if (c->id) {
 173     CHECK(mk_writeID(c->parent, c->id));
 174     CHECK(mk_writeSize(c->parent, c->d_cur));
 175   }
 176
 177   if (c->parent && off != NULL)
 178     *off += c->parent->d_cur;
 179
 180   CHECK(mk_flushContextData(c));
 181
 182   if (c->next)
 183     c->next->prev = c->prev;
 184   *(c->prev) = c->next;
 185   c->next = c->owner->freelist;
 186   c->owner->freelist = c;
 187
 188   return 0;
 189 }
 190
 191 static void       mk_destroyContexts(mk_Writer *w) {
 192   mk_Context  *cur, *next;
 193
 194   for (cur = w->freelist; cur; cur = next) {
 195     next = cur->next;
 196     free(cur->data);
 197     free(cur);
 198   }
 199
 200   for (cur = w->actlist; cur; cur = next) {
 201     next = cur->next;
 202     free(cur->data);
 203     free(cur);
 204   }
 205
 206   w->freelist = w->actlist = w->root = NULL;
 207 }
 208
 209 static int        mk_writeStr(mk_Context *c, unsigned id, const char *str) {
 210   size_t  len = strlen(str);
 211
 212   CHECK(mk_writeID(c, id));
 213   CHECK(mk_writeSize(c, len));
 214   CHECK(mk_appendContextData(c, str, len));
 215   return 0;
 216 }
 217
 218 static int        mk_writeBin(mk_Context *c, unsigned id, const void *data, unsigned size) {
 219   CHECK(mk_writeID(c, id));
 220   CHECK(mk_writeSize(c, size));
 221   CHECK(mk_appendContextData(c, data, size));
 222   return 0;
 223 }
 224
 225 static int        mk_writeUInt(mk_Context *c, unsigned id, int64_t ui) {
 226   unsigned char   c_ui[8] = { ui >> 56, ui >> 48, ui >> 40, ui >> 32, ui >> 24, ui >> 16, ui >> 8, ui };
 227   unsigned        i = 0;
 228
 229   CHECK(mk_writeID(c, id));
 230   while (i < 7 && c_ui[i] == 0)
 231     ++i;
 232   CHECK(mk_writeSize(c, 8 - i));
 233   CHECK(mk_appendContextData(c, c_ui+i, 8 - i));
 234   return 0;
 235 }
 236
 237 static int        mk_writeSInt(mk_Context *c, unsigned id, int64_t si) {
 238   unsigned char   c_si[8] = { si >> 56, si >> 48, si >> 40, si >> 32, si >> 24, si >> 16, si >> 8, si };
 239   unsigned        i = 0;
 240
 241   CHECK(mk_writeID(c, id));
 242   if (si < 0)
 243     while (i < 7 && c_si[i] == 0xff && c_si[i+1] & 0x80)
 244       ++i;
 245   else
 246     while (i < 7 && c_si[i] == 0 && !(c_si[i+1] & 0x80))
 247       ++i;
 248   CHECK(mk_writeSize(c, 8 - i));
 249   CHECK(mk_appendContextData(c, c_si+i, 8 - i));
 250   return 0;
 251 }
 252
 253 static int        mk_writeFloatRaw(mk_Context *c, float f) {
 254   union {
 255     float f;
 256     unsigned u;
 257   } u;
 258   unsigned char c_f[4];
 259
 260   u.f = f;
 261   c_f[0] = u.u >> 24;
 262   c_f[1] = u.u >> 16;
 263   c_f[2] = u.u >> 8;
 264   c_f[3] = u.u;
 265
 266   return mk_appendContextData(c, c_f, 4);
 267 }
 268
 269 static int        mk_writeFloat(mk_Context *c, unsigned id, float f) {
 270   CHECK(mk_writeID(c, id));
 271   CHECK(mk_writeSize(c, 4));
 272   CHECK(mk_writeFloatRaw(c, f));
 273   return 0;
 274 }
 275
 276 static unsigned   mk_ebmlSizeSize(unsigned s) {
 277   if (s < 0x7f)
 278     return 1;
 279   if (s < 0x3fff)
 280     return 2;
 281   if (s < 0x1fffff)
 282     return 3;
 283   if (s < 0x0fffffff)
 284     return 4;
 285   return 5;
 286 }
 287
 288 static unsigned   mk_ebmlSIntSize(int64_t si) {
 289   unsigned char   c_si[8] = { si >> 56, si >> 48, si >> 40, si >> 32, si >> 24, si >> 16, si >> 8, si };
 290   unsigned        i = 0;
 291
 292   if (si < 0)
 293     while (i < 7 && c_si[i] == 0xff && c_si[i+1] & 0x80)
 294       ++i;
 295   else
 296     while (i < 7 && c_si[i] == 0 && !(c_si[i+1] & 0x80))
 297       ++i;
 298
 299   return 8 - i;
 300 }
 301
 302 mk_Writer *mk_createWriter(const char *filename) {
 303   mk_Writer *w = malloc(sizeof(*w));
 304   if (w == NULL)
 305     return NULL;
 306
 307   memset(w, 0, sizeof(*w));
 308
 309   w->root = mk_createContext(w, NULL, 0);
 310   if (w->root == NULL) {
 311     free(w);
 312     return NULL;
 313   }
 314
 315   w->fp = fopen(filename, "wb");
 316   if (w->fp == NULL) {
 317     mk_destroyContexts(w);
 318     free(w);
 319     return NULL;
 320   }
 321
 322   w->timescale = 1000000;
 323
 324   return w;
 325 }
 326
 327 int       mk_writeHeader(mk_Writer *w, const char *writingApp,
 328                          const char *codecID,
 329                          const void *codecPrivate, unsigned codecPrivateSize,
 330                          int64_t default_frame_duration,
 331                          int64_t timescale,
 332                          unsigned width, unsigned height,
 333                          unsigned d_width, unsigned d_height)
 334 {
 335   mk_Context  *c, *ti, *v;
 336
 337   if (w->wrote_header)
 338     return -1;
 339
 340   w->timescale = timescale;
 341   w->def_duration = default_frame_duration;
 342
 343   if ((c = mk_createContext(w, w->root, 0x1a45dfa3)) == NULL) // EBML
 344     return -1;
 345   CHECK(mk_writeUInt(c, 0x4286, 1)); // EBMLVersion
 346   CHECK(mk_writeUInt(c, 0x42f7, 1)); // EBMLReadVersion
 347   CHECK(mk_writeUInt(c, 0x42f2, 4)); // EBMLMaxIDLength
 348   CHECK(mk_writeUInt(c, 0x42f3, 8)); // EBMLMaxSizeLength
 349   CHECK(mk_writeStr(c, 0x4282, "matroska")); // DocType
 350   CHECK(mk_writeUInt(c, 0x4287, 1)); // DocTypeVersion
 351   CHECK(mk_writeUInt(c, 0x4285, 1)); // DocTypeReadversion
 352   CHECK(mk_closeContext(c, 0));
 353
 354   if ((c = mk_createContext(w, w->root, 0x18538067)) == NULL) // Segment
 355     return -1;
 356   CHECK(mk_flushContextID(c));
 357   CHECK(mk_closeContext(c, 0));
 358
 359   if ((c = mk_createContext(w, w->root, 0x1549a966)) == NULL) // SegmentInfo
 360     return -1;
 361   CHECK(mk_writeStr(c, 0x4d80, "Haali Matroska Writer b0"));
 362   CHECK(mk_writeStr(c, 0x5741, writingApp));
 363   CHECK(mk_writeUInt(c, 0x2ad7b1, w->timescale));
 364   CHECK(mk_writeFloat(c, 0x4489, 0));
 365   w->duration_ptr = c->d_cur - 4;
 366   CHECK(mk_closeContext(c, &w->duration_ptr));
 367
 368   if ((c = mk_createContext(w, w->root, 0x1654ae6b)) == NULL) // tracks
 369     return -1;
 370   if ((ti = mk_createContext(w, c, 0xae)) == NULL) // TrackEntry
 371     return -1;
 372   CHECK(mk_writeUInt(ti, 0xd7, 1)); // TrackNumber
 373   CHECK(mk_writeUInt(ti, 0x73c5, 1)); // TrackUID
 374   CHECK(mk_writeUInt(ti, 0x83, 1)); // TrackType
 375   CHECK(mk_writeUInt(ti, 0x9c, 0)); // FlagLacing
 376   CHECK(mk_writeStr(ti, 0x86, codecID)); // CodecID
 377   if (codecPrivateSize)
 378     CHECK(mk_writeBin(ti, 0x63a2, codecPrivate, codecPrivateSize)); // CodecPrivate
 379   if (default_frame_duration)
 380     CHECK(mk_writeUInt(ti, 0x23e383, default_frame_duration)); // DefaultDuration
 381
 382   if ((v = mk_createContext(w, ti, 0xe0)) == NULL) // Video
 383     return -1;
 384   CHECK(mk_writeUInt(v, 0xb0, width));
 385   CHECK(mk_writeUInt(v, 0xba, height));
 386   CHECK(mk_writeUInt(v, 0x54b0, d_width));
 387   CHECK(mk_writeUInt(v, 0x54ba, d_height));
 388   CHECK(mk_closeContext(v, 0));
 389
 390   CHECK(mk_closeContext(ti, 0));
 391
 392   CHECK(mk_closeContext(c, 0));
 393
 394   CHECK(mk_flushContextData(w->root));
 395
 396   w->wrote_header = 1;
 397
 398   return 0;
 399 }
 400
 401 static int mk_closeCluster(mk_Writer *w) {
 402   if (w->cluster == NULL)
 403     return 0;
 404   CHECK(mk_closeContext(w->cluster, 0));
 405   w->cluster = NULL;
 406   CHECK(mk_flushContextData(w->root));
 407   return 0;
 408 }
 409
 410 static int mk_flushFrame(mk_Writer *w) {
 411   int64_t       delta, ref = 0;
 412   unsigned      fsize, bgsize;
 413   unsigned char c_delta_flags[3];
 414
 415   if (!w->in_frame)
 416     return 0;
 417
 418   delta = w->frame_tc/w->timescale - w->cluster_tc_scaled;
 419   if (delta > 32767ll || delta < -32768ll)
 420     CHECK(mk_closeCluster(w));
 421
 422   if (w->cluster == NULL) {
 423     w->cluster_tc_scaled = w->frame_tc / w->timescale;
 424     w->cluster = mk_createContext(w, w->root, 0x1f43b675); // Cluster
 425     if (w->cluster == NULL)
 426       return -1;
 427
 428     CHECK(mk_writeUInt(w->cluster, 0xe7, w->cluster_tc_scaled)); // Timecode
 429
 430     delta = 0;
 431   }
 432
 433   fsize = w->frame ? w->frame->d_cur : 0;
 434   bgsize = fsize + 4 + mk_ebmlSizeSize(fsize + 4) + 1;
 435   if (!w->keyframe) {
 436     ref = w->prev_frame_tc_scaled - w->cluster_tc_scaled - delta;
 437     bgsize += 1 + 1 + mk_ebmlSIntSize(ref);
 438   }
 439
 440   CHECK(mk_writeID(w->cluster, 0xa0)); // BlockGroup
 441   CHECK(mk_writeSize(w->cluster, bgsize));
 442   CHECK(mk_writeID(w->cluster, 0xa1)); // Block
 443   CHECK(mk_writeSize(w->cluster, fsize + 4));
 444   CHECK(mk_writeSize(w->cluster, 1)); // track number
 445
 446   c_delta_flags[0] = delta >> 8;
 447   c_delta_flags[1] = delta;
 448   c_delta_flags[2] = 0;
 449   CHECK(mk_appendContextData(w->cluster, c_delta_flags, 3));
 450   if (w->frame) {
 451     CHECK(mk_appendContextData(w->cluster, w->frame->data, w->frame->d_cur));
 452     w->frame->d_cur = 0;
 453   }
 454   if (!w->keyframe)
 455     CHECK(mk_writeSInt(w->cluster, 0xfb, ref)); // ReferenceBlock
 456
 457   w->in_frame = 0;
 458   w->prev_frame_tc_scaled = w->cluster_tc_scaled + delta;
 459
 460   if (w->cluster->d_cur > CLSIZE)
 461     CHECK(mk_closeCluster(w));
 462
 463   return 0;
 464 }
 465
 466 int       mk_startFrame(mk_Writer *w) {
 467   if (mk_flushFrame(w) < 0)
 468     return -1;
 469
 470   w->in_frame = 1;
 471   w->keyframe = 0;
 472
 473   return 0;
 474 }
 475
 476 int       mk_setFrameFlags(mk_Writer *w,int64_t timestamp, int keyframe) {
 477   if (!w->in_frame)
 478     return -1;
 479
 480   w->frame_tc = timestamp;
 481   w->keyframe = keyframe != 0;
 482
 483   if (w->max_frame_tc < timestamp)
 484     w->max_frame_tc = timestamp;
 485
 486   return 0;
 487 }
 488
 489 int       mk_addFrameData(mk_Writer *w, const void *data, unsigned size) {
 490   if (!w->in_frame)
 491     return -1;
 492
 493   if (w->frame == NULL)
 494     if ((w->frame = mk_createContext(w, NULL, 0)) == NULL)
 495       return -1;
 496
 497   return mk_appendContextData(w->frame, data, size);
 498 }
 499
 500 int       mk_close(mk_Writer *w) {
 501   int   ret = 0;
 502   if (mk_flushFrame(w) < 0 || mk_closeCluster(w) < 0)
 503     ret = -1;
 504   if (w->wrote_header) {
 505     fseek(w->fp, w->duration_ptr, SEEK_SET);
 506     if (mk_writeFloatRaw(w->root, (float)((double)(w->max_frame_tc+w->def_duration) / w->timescale)) < 0 ||
 507         mk_flushContextData(w->root) < 0)
 508       ret = -1;
 509   }
 510   mk_destroyContexts(w);
 511   fclose(w->fp);
 512   free(w);
 513   return ret;
 514 }
 515