libavformat/nut.c

   1 /*
   2  * nut
   3  * Copyright (c) 2004-2007 Michael Niedermayer
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/tree.h"
  23 #include "nut.h"
  24
  25 const AVCodecTag ff_nut_subtitle_tags[] = {
  26     { CODEC_ID_TEXT        , MKTAG('U', 'T', 'F', '8') },
  27     { CODEC_ID_SSA         , MKTAG('S', 'S', 'A',  0 ) },
  28     { CODEC_ID_DVD_SUBTITLE, MKTAG('D', 'V', 'D', 'S') },
  29     { CODEC_ID_DVB_SUBTITLE, MKTAG('D', 'V', 'B', 'S') },
  30     { CODEC_ID_NONE        , 0                         }
  31 };
  32
  33 void ff_nut_reset_ts(NUTContext *nut, AVRational time_base, int64_t val){
  34     int i;
  35     for(i=0; i<nut->avf->nb_streams; i++){
  36         nut->stream[i].last_pts= av_rescale_rnd(
  37             val,
  38             time_base.num * (int64_t)nut->stream[i].time_base->den,
  39             time_base.den * (int64_t)nut->stream[i].time_base->num,
  40             AV_ROUND_DOWN);
  41     }
  42 }
  43
  44 int64_t ff_lsb2full(StreamContext *stream, int64_t lsb){
  45     int64_t mask = (1<<stream->msb_pts_shift)-1;
  46     int64_t delta= stream->last_pts - mask/2;
  47     return  ((lsb - delta)&mask) + delta;
  48 }
  49
  50 int ff_nut_sp_pos_cmp(Syncpoint *a, Syncpoint *b){
  51     return ((a->pos - b->pos) >> 32) - ((b->pos - a->pos) >> 32);
  52 }
  53
  54 int ff_nut_sp_pts_cmp(Syncpoint *a, Syncpoint *b){
  55     return ((a->ts - b->ts) >> 32) - ((b->ts - a->ts) >> 32);
  56 }
  57
  58 void ff_nut_add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts){
  59     Syncpoint *sp= av_mallocz(sizeof(Syncpoint));
  60     struct AVTreeNode *node= av_mallocz(av_tree_node_size);
  61
  62     sp->pos= pos;
  63     sp->back_ptr= back_ptr;
  64     sp->ts= ts;
  65     av_tree_insert(&nut->syncpoints, sp, ff_nut_sp_pos_cmp, &node);
  66     if(node){
  67         av_free(sp);
  68         av_free(node);
  69     }
  70 }
  71
  72 const Dispositions ff_nut_dispositions[] = {
  73     {"default"     , AV_DISPOSITION_DEFAULT},
  74     {"dub"         , AV_DISPOSITION_DUB},
  75     {"original"    , AV_DISPOSITION_ORIGINAL},
  76     {"comment"     , AV_DISPOSITION_COMMENT},
  77     {"lyrics"      , AV_DISPOSITION_LYRICS},
  78     {"karaoke"     , AV_DISPOSITION_KARAOKE},
  79     {""            , 0}
  80 };
  81