blob: 50847811236619a01c319a2f741d543a93321163
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 "libavutil/avstring.h" |
30 | #include "libavutil/bprint.h" |
31 | |
32 | static int rt_event_to_ass(AVBPrint *buf, const char *p) |
33 | { |
34 | int prev_chr_is_space = 1; |
35 | |
36 | while (*p) { |
37 | if (*p != '<') { |
38 | if (!av_isspace(*p)) |
39 | av_bprint_chars(buf, *p, 1); |
40 | else if (!prev_chr_is_space) |
41 | av_bprint_chars(buf, ' ', 1); |
42 | prev_chr_is_space = av_isspace(*p); |
43 | } else { |
44 | const char *end = strchr(p, '>'); |
45 | if (!end) |
46 | break; |
47 | if (!av_strncasecmp(p, "<br/>", 5) || |
48 | !av_strncasecmp(p, "<br>", 4)) { |
49 | av_bprintf(buf, "\\N"); |
50 | } |
51 | p = end; |
52 | } |
53 | p++; |
54 | } |
55 | return 0; |
56 | } |
57 | |
58 | static int realtext_decode_frame(AVCodecContext *avctx, |
59 | void *data, int *got_sub_ptr, AVPacket *avpkt) |
60 | { |
61 | int ret = 0; |
62 | AVSubtitle *sub = data; |
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 | AVCodec ff_realtext_decoder = { |
78 | .name = "realtext", |
79 | .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"), |
80 | .type = AVMEDIA_TYPE_SUBTITLE, |
81 | .id = AV_CODEC_ID_REALTEXT, |
82 | .decode = realtext_decode_frame, |
83 | .init = ff_ass_subtitle_header_default, |
84 | .flush = ff_ass_decoder_flush, |
85 | .priv_data_size = sizeof(FFASSDecoderContext), |
86 | }; |
87 |