1/*
2 * Copyright (c) 2012 Cl��ment B��sch
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
31static 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
50static 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
76AVCodec 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