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 "codec_internal.h"
30#include "libavutil/bprint.h"
31
32static int subviewer_event_to_ass(AVBPrint *buf, const char *p)
33{
34    while (*p) {
35        if (!strncmp(p, "[br]", 4)) {
36            av_bprintf(buf, "\\N");
37            p += 4;
38        } else {
39            if (p[0] == '\n' && p[1])
40                av_bprintf(buf, "\\N");
41            else if (*p != '\n' && *p != '\r')
42                av_bprint_chars(buf, *p, 1);
43            p++;
44        }
45    }
46
47    return 0;
48}
49
50static int subviewer_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
51                                  int *got_sub_ptr, const AVPacket *avpkt)
52{
53    int ret = 0;
54    const char *ptr = avpkt->data;
55    FFASSDecoderContext *s = avctx->priv_data;
56    AVBPrint buf;
57
58    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
59    if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr))
60        ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
61    av_bprint_finalize(&buf, NULL);
62    if (ret < 0)
63        return ret;
64    *got_sub_ptr = sub->num_rects > 0;
65    return avpkt->size;
66}
67
68const FFCodec ff_subviewer_decoder = {
69    .p.name         = "subviewer",
70    .p.long_name    = NULL_IF_CONFIG_SMALL("SubViewer subtitle"),
71    .p.type         = AVMEDIA_TYPE_SUBTITLE,
72    .p.id           = AV_CODEC_ID_SUBVIEWER,
73    FF_CODEC_DECODE_SUB_CB(subviewer_decode_frame),
74    .init           = ff_ass_subtitle_header_default,
75    .flush          = ff_ass_decoder_flush,
76    .priv_data_size = sizeof(FFASSDecoderContext),
77    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
78};
79