LCOV - code coverage report
Current view: top level - libavcodec - webvttdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 39 40 97.5 %
Date: 2017-12-16 01:21:47 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Clément Bœsch
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * WebVTT subtitle decoder
      24             :  * @see http://dev.w3.org/html5/webvtt/
      25             :  * @todo need to support extended markups and cue settings
      26             :  */
      27             : 
      28             : #include "avcodec.h"
      29             : #include "ass.h"
      30             : #include "libavutil/bprint.h"
      31             : 
      32             : static const struct {
      33             :     const char *from;
      34             :     const char *to;
      35             : } webvtt_tag_replace[] = {
      36             :     {"<i>", "{\\i1}"}, {"</i>", "{\\i0}"},
      37             :     {"<b>", "{\\b1}"}, {"</b>", "{\\b0}"},
      38             :     {"<u>", "{\\u1}"}, {"</u>", "{\\u0}"},
      39             :     {"{", "\\{"}, {"}", "\\}"}, // escape to avoid ASS markup conflicts
      40             :     {"&gt;", ">"}, {"&lt;", "<"},
      41             :     {"&lrm;", ""}, {"&rlm;", ""}, // FIXME: properly honor bidi marks
      42             :     {"&amp;", "&"}, {"&nbsp;", "\\h"},
      43             : };
      44             : 
      45          27 : static int webvtt_event_to_ass(AVBPrint *buf, const char *p)
      46             : {
      47          27 :     int i, again = 0, skip = 0;
      48             : 
      49        1550 :     while (*p) {
      50             : 
      51       22326 :         for (i = 0; i < FF_ARRAY_ELEMS(webvtt_tag_replace); i++) {
      52       20847 :             const char *from = webvtt_tag_replace[i].from;
      53       20847 :             const size_t len = strlen(from);
      54       20847 :             if (!strncmp(p, from, len)) {
      55          19 :                 av_bprintf(buf, "%s", webvtt_tag_replace[i].to);
      56          19 :                 p += len;
      57          19 :                 again = 1;
      58          19 :                 break;
      59             :             }
      60             :         }
      61        1498 :         if (!*p)
      62           2 :             break;
      63             : 
      64        1496 :         if (again) {
      65          17 :             again = 0;
      66          17 :             skip = 0;
      67          17 :             continue;
      68             :         }
      69        1479 :         if (*p == '<')
      70          41 :             skip = 1;
      71        1438 :         else if (*p == '>')
      72          41 :             skip = 0;
      73        1397 :         else if (p[0] == '\n' && p[1])
      74           9 :             av_bprintf(buf, "\\N");
      75        1388 :         else if (!skip && *p != '\r')
      76        1024 :             av_bprint_chars(buf, *p, 1);
      77        1479 :         p++;
      78             :     }
      79          27 :     return 0;
      80             : }
      81             : 
      82          27 : static int webvtt_decode_frame(AVCodecContext *avctx,
      83             :                                void *data, int *got_sub_ptr, AVPacket *avpkt)
      84             : {
      85          27 :     int ret = 0;
      86          27 :     AVSubtitle *sub = data;
      87          27 :     const char *ptr = avpkt->data;
      88          27 :     FFASSDecoderContext *s = avctx->priv_data;
      89             :     AVBPrint buf;
      90             : 
      91          27 :     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
      92          27 :     if (ptr && avpkt->size > 0 && !webvtt_event_to_ass(&buf, ptr))
      93          27 :         ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
      94          27 :     av_bprint_finalize(&buf, NULL);
      95          27 :     if (ret < 0)
      96           0 :         return ret;
      97          27 :     *got_sub_ptr = sub->num_rects > 0;
      98          27 :     return avpkt->size;
      99             : }
     100             : 
     101             : AVCodec ff_webvtt_decoder = {
     102             :     .name           = "webvtt",
     103             :     .long_name      = NULL_IF_CONFIG_SMALL("WebVTT subtitle"),
     104             :     .type           = AVMEDIA_TYPE_SUBTITLE,
     105             :     .id             = AV_CODEC_ID_WEBVTT,
     106             :     .decode         = webvtt_decode_frame,
     107             :     .init           = ff_ass_subtitle_header_default,
     108             :     .flush          = ff_ass_decoder_flush,
     109             :     .priv_data_size = sizeof(FFASSDecoderContext),
     110             : };

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