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  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.  * SubViewer subtitle decoder
  24.  * @see https://en.wikipedia.org/wiki/SubViewer
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "ass.h"
  29. #include "libavutil/bprint.h"
  30.  
  31. static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
  32. {
  33.     while (*p) {
  34.         if (!strncmp(p, "[br]", 4)) {
  35.             av_bprintf(buf, "\\N");
  36.             p += 4;
  37.         } else {
  38.             if (p[0] == '\n' && p[1])
  39.                 av_bprintf(buf, "\\N");
  40.             else if (*p != '\n' && *p != '\r')
  41.                 av_bprint_chars(buf, *p, 1);
  42.             p++;
  43.         }
  44.     }
  45.  
  46.     av_bprintf(buf, "\r\n");
  47.     return 0;
  48. }
  49.  
  50. static int subviewer_decode_frame(AVCodecContext *avctx,
  51.                                   void *data, int *got_sub_ptr, AVPacket *avpkt)
  52. {
  53.     char c;
  54.     AVSubtitle *sub = data;
  55.     const char *ptr = avpkt->data;
  56.     AVBPrint buf;
  57.  
  58.     /* To be removed later */
  59.     if (ptr && sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) {
  60.         av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing "
  61.                "information). You need to upgrade your libavformat or "
  62.                "sanitize your packet.\n");
  63.         return AVERROR_INVALIDDATA;
  64.     }
  65.  
  66.     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
  67.     // note: no need to rescale pts & duration since they are in the same
  68.     // timebase as ASS (1/100)
  69.     if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
  70.         ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0);
  71.     *got_sub_ptr = sub->num_rects > 0;
  72.     av_bprint_finalize(&buf, NULL);
  73.     return avpkt->size;
  74. }
  75.  
  76. AVCodec ff_subviewer_decoder = {
  77.     .name           = "subviewer",
  78.     .long_name      = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
  79.     .type           = AVMEDIA_TYPE_SUBTITLE,
  80.     .id             = AV_CODEC_ID_SUBVIEWER,
  81.     .decode         = subviewer_decode_frame,
  82.     .init           = ff_ass_subtitle_header_default,
  83. };
  84.