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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 | * 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 | ||
2ba45a60 DM |
46 | return 0; |
47 | } | |
48 | ||
49 | static int subviewer_decode_frame(AVCodecContext *avctx, | |
50 | void *data, int *got_sub_ptr, AVPacket *avpkt) | |
51 | { | |
f6fa7814 | 52 | int ret = 0; |
2ba45a60 DM |
53 | AVSubtitle *sub = data; |
54 | const char *ptr = avpkt->data; | |
55 | AVBPrint buf; | |
56 | ||
2ba45a60 DM |
57 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
58 | // note: no need to rescale pts & duration since they are in the same | |
59 | // timebase as ASS (1/100) | |
60 | if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr)) | |
f6fa7814 | 61 | ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration); |
2ba45a60 | 62 | av_bprint_finalize(&buf, NULL); |
f6fa7814 DM |
63 | if (ret < 0) |
64 | return ret; | |
65 | *got_sub_ptr = sub->num_rects > 0; | |
2ba45a60 DM |
66 | return avpkt->size; |
67 | } | |
68 | ||
69 | AVCodec ff_subviewer_decoder = { | |
70 | .name = "subviewer", | |
71 | .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle"), | |
72 | .type = AVMEDIA_TYPE_SUBTITLE, | |
73 | .id = AV_CODEC_ID_SUBVIEWER, | |
74 | .decode = subviewer_decode_frame, | |
75 | .init = ff_ass_subtitle_header_default, | |
76 | }; |