src/chapters.c

   1 /*****************************************************************************
   2  * chapters.c:
   3  *****************************************************************************
   4  * Copyright (C) 2007 libmkv
   5  * $Id: $
   6  *
   7  * Authors: 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
  27 int   mk_createChapterSimple(mk_Writer *w, uint64_t start, uint64_t end, 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   {
  41         unsigned long edition_uid;
  42         edition_uid = random();
  43
  44     if ((w->chapters = mk_createContext(w, w->root, MATROSKA_ID_CHAPTERS)) == NULL) // Chapters
  45       return -1;
  46     if ((w->edition_entry = mk_createContext(w, w->chapters, MATROSKA_ID_EDITIONENTRY)) == NULL) // EditionEntry
  47       return -1;
  48         CHECK(mk_writeUInt(w->edition_entry, MATROSKA_ID_EDITIONUID, edition_uid));     /* EditionUID - See note above about Chapter UID. */
  49     CHECK(mk_writeUInt(w->edition_entry, MATROSKA_ID_EDITIONFLAGDEFAULT, 1)); // EditionFlagDefault - Force this to be the default.
  50     CHECK(mk_writeUInt(w->edition_entry, MATROSKA_ID_EDITIONFLAGORDERED, 0)); // EditionFlagOrdered - Force simple chapters.
  51   }
  52   if ((ca = mk_createContext(w, w->edition_entry, MATROSKA_ID_CHAPTERATOM)) == NULL) // ChapterAtom
  53     return -1;
  54   CHECK(mk_writeUInt(ca, MATROSKA_ID_CHAPTERUID, chapter_uid)); /* ChapterUID */
  55   CHECK(mk_writeUInt(ca, MATROSKA_ID_CHAPTERTIMESTART, start)); // ChapterTimeStart
  56   if (end != start)                     // Just create a StartTime if chapter length would be 0.
  57     CHECK(mk_writeUInt(ca, MATROSKA_ID_CHAPTERTIMEEND, end)); // ChapterTimeEnd
  58   if (name != NULL) {
  59     if ((cd = mk_createContext(w, ca, MATROSKA_ID_CHAPTERDISPLAY)) == NULL) // ChapterDisplay
  60       return -1;
  61     CHECK(mk_writeStr(cd, MATROSKA_ID_CHAPTERSTRING, name)); // ChapterString
  62     CHECK(mk_closeContext(cd, 0));
  63   }
  64   CHECK(mk_closeContext(ca, 0));
  65
  66   return 0;
  67 }
  68
  69 int   mk_writeChapters(mk_Writer *w) {
  70   if ((w->chapters == NULL) || (w->edition_entry == NULL))
  71     return -1;
  72   CHECK(mk_closeContext(w->edition_entry, 0));
  73   CHECK(mk_closeContext(w->chapters, 0));
  74
  75   return 0;
  76 }