LCOV - code coverage report
Current view: top level - libavcodec - dvdsub_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 28 31 90.3 %
Date: 2017-12-14 01:15:32 Functions: 3 3 100.0 %

          Line data    Source code
       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           6 : static av_cold int dvdsub_parse_init(AVCodecParserContext *s)
      36             : {
      37           6 :     return 0;
      38             : }
      39             : 
      40          12 : 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          12 :     DVDSubParseContext *pc = s->priv_data;
      46             : 
      47          12 :     if (pc->packet_index == 0) {
      48           4 :         if (buf_size < 2 || AV_RB16(buf) && buf_size < 6) {
      49           2 :             if (buf_size)
      50           0 :                 av_log(avctx, AV_LOG_DEBUG, "Parser input %d too small\n", buf_size);
      51           2 :             return buf_size;
      52             :         }
      53           2 :         pc->packet_len = AV_RB16(buf);
      54           2 :         if (pc->packet_len == 0) /* HD-DVD subpicture packet */
      55           0 :             pc->packet_len = AV_RB32(buf+2);
      56           2 :         av_freep(&pc->packet);
      57           2 :         pc->packet = av_malloc(pc->packet_len);
      58             :     }
      59          10 :     if (pc->packet) {
      60          10 :         if (pc->packet_index + buf_size <= pc->packet_len) {
      61          10 :             memcpy(pc->packet + pc->packet_index, buf, buf_size);
      62          10 :             pc->packet_index += buf_size;
      63          10 :             if (pc->packet_index >= pc->packet_len) {
      64           2 :                 *poutbuf = pc->packet;
      65           2 :                 *poutbuf_size = pc->packet_len;
      66           2 :                 pc->packet_index = 0;
      67           2 :                 return buf_size;
      68             :             }
      69             :         } else {
      70             :             /* erroneous size */
      71           0 :             pc->packet_index = 0;
      72             :         }
      73             :     }
      74           8 :     *poutbuf = NULL;
      75           8 :     *poutbuf_size = 0;
      76           8 :     return buf_size;
      77             : }
      78             : 
      79           6 : static av_cold void dvdsub_parse_close(AVCodecParserContext *s)
      80             : {
      81           6 :     DVDSubParseContext *pc = s->priv_data;
      82           6 :     av_freep(&pc->packet);
      83           6 : }
      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             : };

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