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
rt_event_to_ass(AVBPrint *buf, const char *p)33 static 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
realtext_decode_frame(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *avpkt)59 static 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
77 const 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