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  1. /*
  2.  * DVD subtitle decoding
  3.  * Copyright (c) 2005 Fabrice Bellard
  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 <string.h>
  23.  
  24. #include "libavutil/intreadwrite.h"
  25. #include "libavutil/mem.h"
  26. #include "avcodec.h"
  27.  
  28. /* parser definition */
  29. typedef struct DVDSubParseContext {
  30.     uint8_t *packet;
  31.     int packet_len;
  32.     int packet_index;
  33. } DVDSubParseContext;
  34.  
  35. static av_cold int dvdsub_parse_init(AVCodecParserContext *s)
  36. {
  37.     return 0;
  38. }
  39.  
  40. static int dvdsub_parse(AVCodecParserContext *s,
  41.                         AVCodecContext *avctx,
  42.                         const uint8_t **poutbuf, int *poutbuf_size,
  43.                         const uint8_t *buf, int buf_size)
  44. {
  45.     DVDSubParseContext *pc = s->priv_data;
  46.  
  47.     if (pc->packet_index == 0) {
  48.         if (buf_size < 2 || AV_RB16(buf) && buf_size < 6) {
  49.             if (buf_size)
  50.                 av_log(avctx, AV_LOG_DEBUG, "Parser input %d too small\n", buf_size);
  51.             return buf_size;
  52.         }
  53.         pc->packet_len = AV_RB16(buf);
  54.         if (pc->packet_len == 0) /* HD-DVD subpicture packet */
  55.             pc->packet_len = AV_RB32(buf+2);
  56.         av_freep(&pc->packet);
  57.         pc->packet = av_malloc(pc->packet_len);
  58.     }
  59.     if (pc->packet) {
  60.         if (pc->packet_index + buf_size <= pc->packet_len) {
  61.             memcpy(pc->packet + pc->packet_index, buf, buf_size);
  62.             pc->packet_index += buf_size;
  63.             if (pc->packet_index >= pc->packet_len) {
  64.                 *poutbuf = pc->packet;
  65.                 *poutbuf_size = pc->packet_len;
  66.                 pc->packet_index = 0;
  67.                 return buf_size;
  68.             }
  69.         } else {
  70.             /* erroneous size */
  71.             pc->packet_index = 0;
  72.         }
  73.     }
  74.     *poutbuf = NULL;
  75.     *poutbuf_size = 0;
  76.     return buf_size;
  77. }
  78.  
  79. static av_cold void dvdsub_parse_close(AVCodecParserContext *s)
  80. {
  81.     DVDSubParseContext *pc = s->priv_data;
  82.     av_freep(&pc->packet);
  83. }
  84.  
  85. AVCodecParser ff_dvdsub_parser = {
  86.     .codec_ids      = { AV_CODEC_ID_DVD_SUBTITLE },
  87.     .priv_data_size = sizeof(DVDSubParseContext),
  88.     .parser_init    = dvdsub_parse_init,
  89.     .parser_parse   = dvdsub_parse,
  90.     .parser_close   = dvdsub_parse_close,
  91. };
  92.