FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/webvttdec.c
Date: 2024-11-21 09:21:34
Exec Total Coverage
Lines: 38 39 97.4%
Functions: 2 2 100.0%
Branches: 25 30 83.3%
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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 * WebVTT subtitle decoder
24 * @see http://dev.w3.org/html5/webvtt/
25 * @todo need to support extended markups and cue settings
26 */
27
28 #include "avcodec.h"
29 #include "ass.h"
30 #include "codec_internal.h"
31 #include "libavutil/bprint.h"
32
33 static const struct {
34 const char *from;
35 const char *to;
36 } webvtt_tag_replace[] = {
37 {"<i>", "{\\i1}"}, {"</i>", "{\\i0}"},
38 {"<b>", "{\\b1}"}, {"</b>", "{\\b0}"},
39 {"<u>", "{\\u1}"}, {"</u>", "{\\u0}"},
40 {"{", "\\{{}"}, {"\\", "\\\xe2\x81\xa0"}, // escape to avoid ASS markup conflicts
41 {"&gt;", ">"}, {"&lt;", "<"},
42 {"&lrm;", "\xe2\x80\x8e"}, {"&rlm;", "\xe2\x80\x8f"},
43 {"&amp;", "&"}, {"&nbsp;", "\\h"},
44 };
45
46 27 static int webvtt_event_to_ass(AVBPrint *buf, const char *p)
47 {
48 27 int i, again = 0, skip = 0;
49
50
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 1524 while (*p) {
51
52
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 22333 for (i = 0; i < FF_ARRAY_ELEMS(webvtt_tag_replace); i++) {
53 20853 const char *from = webvtt_tag_replace[i].from;
54 20853 const size_t len = strlen(from);
55
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 20853 if (!strncmp(p, from, len)) {
56 18 av_bprintf(buf, "%s", webvtt_tag_replace[i].to);
57 18 p += len;
58 18 again = 1;
59 18 break;
60 }
61 }
62
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 1498 if (!*p)
63 1 break;
64
65
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 1497 if (again) {
66 17 again = 0;
67 17 skip = 0;
68 17 continue;
69 }
70
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 1480 if (*p == '<')
71 41 skip = 1;
72
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 1439 else if (*p == '>')
73 41 skip = 0;
74
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 1398 else if (p[0] == '\n' && p[1])
75 9 av_bprintf(buf, "\\N");
76
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 1389 else if (!skip && *p != '\r')
77 1025 av_bprint_chars(buf, *p, 1);
78 1480 p++;
79 }
80 27 return 0;
81 }
82
83 27 static int webvtt_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
84 int *got_sub_ptr, const AVPacket *avpkt)
85 {
86 27 int ret = 0;
87 27 const char *ptr = avpkt->data;
88 27 FFASSDecoderContext *s = avctx->priv_data;
89 AVBPrint buf;
90
91 27 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
92
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 27 if (ptr && avpkt->size > 0 && !webvtt_event_to_ass(&buf, ptr))
93 27 ret = ff_ass_add_rect(sub, buf.str, s->readorder++, 0, NULL, NULL);
94 27 av_bprint_finalize(&buf, NULL);
95
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 27 if (ret < 0)
96 ✗ return ret;
97 27 *got_sub_ptr = sub->num_rects > 0;
98 27 return avpkt->size;
99 }
100
101 const FFCodec ff_webvtt_decoder = {
102 .p.name = "webvtt",
103 CODEC_LONG_NAME("WebVTT subtitle"),
104 .p.type = AVMEDIA_TYPE_SUBTITLE,
105 .p.id = AV_CODEC_ID_WEBVTT,
106 FF_CODEC_DECODE_SUB_CB(webvtt_decode_frame),
107 .init = ff_ass_subtitle_header_default,
108 .flush = ff_ass_decoder_flush,
109 .priv_data_size = sizeof(FFASSDecoderContext),
110 };
111