src/chapters.c

   1 /*****************************************************************************
   2  * chapters.c:
   3  *****************************************************************************
   4  * Copyright (C) 2007 libmkv
   5  *
   6  * Authors: Nathan Caldwell
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22 #include "config.h"
  23 #include "libmkv.h"
  24 #include "matroska.h"
  25
  26 int mk_createChapterSimple(mk_Writer *w, uint64_t start, uint64_t end,
  27                                                    char *name)
  28 {
  29         mk_Context *ca, *cd;
  30         unsigned long chapter_uid;
  31
  32         /*
  33          * Generate a random UID for this Chapter.
  34          * NOTE: This probably should be a CRC32 of some unique chapter information.
  35          *        In place of being completely random.
  36          */
  37         chapter_uid = random();
  38
  39         if (w->chapters == NULL) {
  40                 unsigned long edition_uid;
  41                 edition_uid = random();
  42
  43                 /* Chapters */
  44                 if ((w->chapters = mk_createContext(w, w->root, MATROSKA_ID_CHAPTERS)) == NULL)
  45                         return -1;
  46                 /* EditionEntry */
  47                 if ((w->edition_entry = mk_createContext(w, w->chapters, MATROSKA_ID_EDITIONENTRY)) == NULL)
  48                         return -1;
  49                 /* EditionUID - See note above about Chapter UID. */
  50                 CHECK(mk_writeUInt(w->edition_entry, MATROSKA_ID_EDITIONUID, edition_uid));
  51                 /* EditionFlagDefault - This is set to 1 to force this Edition to be the default one. */
  52                 CHECK(mk_writeUInt(w->edition_entry, MATROSKA_ID_EDITIONFLAGDEFAULT, 1));
  53                 /* EditionFlagOrdered - Force simple chapters. */
  54                 CHECK(mk_writeUInt(w->edition_entry, MATROSKA_ID_EDITIONFLAGORDERED, 0));
  55         }
  56         /* ChapterAtom */
  57         if ((ca = mk_createContext(w, w->edition_entry, MATROSKA_ID_CHAPTERATOM)) == NULL)
  58                 return -1;
  59         CHECK(mk_writeUInt(ca, MATROSKA_ID_CHAPTERUID, chapter_uid));   /* ChapterUID */
  60         CHECK(mk_writeUInt(ca, MATROSKA_ID_CHAPTERTIMESTART, start));   /* ChapterTimeStart */
  61         if (end != start)                       /* Only create a StartTime if chapter length would be 0. */
  62                 CHECK(mk_writeUInt(ca, MATROSKA_ID_CHAPTERTIMEEND, end));       /* ChapterTimeEnd */
  63         if (name != NULL) {
  64                 /* ChapterDisplay */
  65                 if ((cd = mk_createContext(w, ca, MATROSKA_ID_CHAPTERDISPLAY)) == NULL)
  66                         return -1;
  67                 CHECK(mk_writeStr(cd, MATROSKA_ID_CHAPTERSTRING, name));        /* ChapterString */
  68                 CHECK(mk_closeContext(cd, 0));
  69         }
  70         CHECK(mk_closeContext(ca, 0));
  71
  72         return 0;
  73 }
  74
  75 int mk_writeChapters(mk_Writer *w)
  76 {
  77         if ((w->chapters == NULL) || (w->edition_entry == NULL))
  78                 return -1;
  79         CHECK(mk_closeContext(w->edition_entry, 0));
  80         CHECK(mk_closeContext(w->chapters, 0));
  81
  82         return 0;
  83 }