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 * RealText subtitle decoder
24 * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
25 */
26
27#include "avcodec.h"
28#include "ass.h"
29#include "codec_internal.h"
30#include "libavutil/avstring.h"
31#include "libavutil/bprint.h"
32
33static int rt_event_to_ass(AVBPrint *buf, const char *p)
34{
35    int prev_chr_is_space = 1;
36
37    while (*p) {
38        if (*p != '<') {
39            if (!av_isspace(*p))
40                av_bprint_chars(buf, *p, 1);
41            else if (!prev_chr_is_space)
42                av_bprint_chars(buf, ' ', 1);
43            prev_chr_is_space = av_isspace(*p);
44        } else {
45            const char *end = strchr(p, '>');
46            if (!end)
47                break;
48            if (!av_strncasecmp(p, "<br/>", 5) ||
49                !av_strncasecmp(p, "<br>",  4)) {
50                av_bprintf(buf, "\\N");
51            }
52            p = end;
53        }
54        p++;
55    }
56    return 0;
57}
58
59static int realtext_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
60                                 int *got_sub_ptr, const AVPacket *avpkt)
61{
62    int ret = 0;
63    const char *ptr = avpkt->data;
64    FFASSDecoderContext *s = avctx->priv_data;
65    AVBPrint buf;
66
67    av_bprint_init(&buf, 0, 4096);
68    if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
69        ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
70    av_bprint_finalize(&buf, NULL);
71    if (ret < 0)
72        return ret;
73    *got_sub_ptr = sub->num_rects > 0;
74    return avpkt->size;
75}
76
77const FFCodec ff_realtext_decoder = {
78    .p.name         = "realtext",
79    .p.long_name    = NULL_IF_CONFIG_SMALL("RealText subtitle"),
80    .p.type         = AVMEDIA_TYPE_SUBTITLE,
81    .p.id           = AV_CODEC_ID_REALTEXT,
82    FF_CODEC_DECODE_SUB_CB(realtext_decode_frame),
83    .init           = ff_ass_subtitle_header_default,
84    .flush          = ff_ass_decoder_flush,
85    .priv_data_size = sizeof(FFASSDecoderContext),
86    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
87};
88