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2ba45a60 DM |
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 | } | |
2ba45a60 DM |
55 | return 0; |
56 | } | |
57 | ||
58 | static int realtext_decode_frame(AVCodecContext *avctx, | |
59 | void *data, int *got_sub_ptr, AVPacket *avpkt) | |
60 | { | |
f6fa7814 | 61 | int ret = 0; |
2ba45a60 DM |
62 | AVSubtitle *sub = data; |
63 | const char *ptr = avpkt->data; | |
64 | AVBPrint buf; | |
65 | ||
66 | av_bprint_init(&buf, 0, 4096); | |
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 && !rt_event_to_ass(&buf, ptr)) | |
f6fa7814 | 70 | ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration); |
2ba45a60 | 71 | av_bprint_finalize(&buf, NULL); |
f6fa7814 DM |
72 | if (ret < 0) |
73 | return ret; | |
74 | *got_sub_ptr = sub->num_rects > 0; | |
2ba45a60 DM |
75 | return avpkt->size; |
76 | } | |
77 | ||
78 | AVCodec ff_realtext_decoder = { | |
79 | .name = "realtext", | |
80 | .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"), | |
81 | .type = AVMEDIA_TYPE_SUBTITLE, | |
82 | .id = AV_CODEC_ID_REALTEXT, | |
83 | .decode = realtext_decode_frame, | |
84 | .init = ff_ass_subtitle_header_default, | |
85 | }; |