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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 "libavutil/bprint.h" | |
30 | ||
31 | static int subviewer_event_to_ass(AVBPrint *buf, const char *p) | |
32 | { | |
33 | while (*p) { | |
34 | if (!strncmp(p, "[br]", 4)) { | |
35 | av_bprintf(buf, "\\N"); | |
36 | p += 4; | |
37 | } else { | |
38 | if (p[0] == '\n' && p[1]) | |
39 | av_bprintf(buf, "\\N"); | |
40 | else if (*p != '\n' && *p != '\r') | |
41 | av_bprint_chars(buf, *p, 1); | |
42 | p++; | |
43 | } | |
44 | } | |
45 | ||
46 | av_bprintf(buf, "\r\n"); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | static int subviewer_decode_frame(AVCodecContext *avctx, | |
51 | void *data, int *got_sub_ptr, AVPacket *avpkt) | |
52 | { | |
53 | char c; | |
54 | AVSubtitle *sub = data; | |
55 | const char *ptr = avpkt->data; | |
56 | AVBPrint buf; | |
57 | ||
58 | /* To be removed later */ | |
59 | if (ptr && sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) { | |
60 | av_log(avctx, AV_LOG_ERROR, "AVPacket is not clean (contains timing " | |
61 | "information). You need to upgrade your libavformat or " | |
62 | "sanitize your packet.\n"); | |
63 | return AVERROR_INVALIDDATA; | |
64 | } | |
65 | ||
66 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); | |
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 && !subviewer_event_to_ass(&buf, ptr)) | |
70 | ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0); | |
71 | *got_sub_ptr = sub->num_rects > 0; | |
72 | av_bprint_finalize(&buf, NULL); | |
73 | return avpkt->size; | |
74 | } | |
75 | ||
76 | AVCodec ff_subviewer_decoder = { | |
77 | .name = "subviewer", | |
78 | .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"), | |
79 | .type = AVMEDIA_TYPE_SUBTITLE, | |
80 | .id = AV_CODEC_ID_SUBVIEWER, | |
81 | .decode = subviewer_decode_frame, | |
82 | .init = ff_ass_subtitle_header_default, | |
83 | }; |