FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/assdec.c
Date: 2025-11-03 14:06:37
Exec Total Coverage
Lines: 71 76 93.4%
Functions: 4 4 100.0%
Branches: 26 32 81.2%
Line Branch Exec Source
1 /*
2 * SSA/ASS demuxer
3 * Copyright (c) 2008 Michael Niedermayer
4 * Copyright (c) 2014 Clément Bœsch
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <stdint.h>
24
25 #include "avformat.h"
26 #include "demux.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 #include "libavutil/bprint.h"
30
31 typedef struct ASSContext {
32 FFDemuxSubtitlesQueue q;
33 unsigned readorder;
34 } ASSContext;
35
36 7282 static int ass_probe(const AVProbeData *p)
37 {
38 char buf[13];
39 FFTextReader tr;
40 7282 ff_text_init_buf(&tr, p->buf, p->buf_size);
41
42
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 7289 while (ff_text_peek_r8(&tr) == '\r' || ff_text_peek_r8(&tr) == '\n')
43 7 ff_text_r8(&tr);
44
45 7282 ff_text_read(&tr, buf, sizeof(buf));
46
47
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 7282 if (!memcmp(buf, "[Script Info]", 13))
48 3 return AVPROBE_SCORE_MAX;
49
50 7279 return 0;
51 }
52
53 208 static int read_dialogue(ASSContext *ass, AVBPrint *dst, const uint8_t *p,
54 int64_t *start, int *duration)
55 {
56 208 int pos = 0;
57 int64_t end;
58 int hh1, mm1, ss1, ms1;
59 int hh2, mm2, ss2, ms2;
60
61
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 208 if (sscanf(p, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n",
62 &hh1, &mm1, &ss1, &ms1,
63
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 51 &hh2, &mm2, &ss2, &ms2, &pos) >= 8 && pos > 0) {
64
65 /* This is not part of the sscanf itself in order to handle an actual
66 * number (which would be the Layer) or the form "Marked=N" (which is
67 * the old SSA field, now replaced by Layer, and will lead to Layer
68 * being 0 here). */
69 51 const int layer = atoi(p + 10);
70
71 51 end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
72 51 *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
73 51 *duration = end - *start;
74
75 51 av_bprint_clear(dst);
76 51 av_bprintf(dst, "%u,%d,%s", ass->readorder++, layer, p + pos);
77
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 51 if (!av_bprint_is_complete(dst))
78 ✗ return AVERROR(ENOMEM);
79
80 /* right strip the buffer */
81 51 while (dst->len > 0 &&
82
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 153 dst->str[dst->len - 1] == '\r' ||
83
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 102 dst->str[dst->len - 1] == '\n')
84 102 dst->str[--dst->len] = 0;
85 51 return 0;
86 }
87 157 return -1;
88 }
89
90 211 static int64_t get_line(AVBPrint *buf, FFTextReader *tr)
91 {
92 211 int64_t pos = ff_text_pos(tr);
93
94 211 av_bprint_clear(buf);
95 16354 for (;;) {
96 16565 char c = ff_text_r8(tr);
97
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 16565 if (!c)
98 3 break;
99 16562 av_bprint_chars(buf, c, 1);
100
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 16562 if (c == '\n')
101 208 break;
102 }
103 211 return pos;
104 }
105
106 3 static int ass_read_header(AVFormatContext *s)
107 {
108 3 ASSContext *ass = s->priv_data;
109 AVBPrint header, line, rline;
110 3 int res = 0;
111 AVStream *st;
112 FFTextReader tr;
113 3 ff_text_init_avio(s, &tr, s->pb);
114
115 3 st = avformat_new_stream(s, NULL);
116
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 3 if (!st)
117 ✗ return AVERROR(ENOMEM);
118 3 avpriv_set_pts_info(st, 64, 1, 100);
119 3 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
120 3 st->codecpar->codec_id = AV_CODEC_ID_ASS;
121
122 3 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
123 3 av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
124 3 av_bprint_init(&rline, 0, AV_BPRINT_SIZE_UNLIMITED);
125
126 3 ass->q.keep_duplicates = 1;
127
128 208 for (;;) {
129 211 int64_t pos = get_line(&line, &tr);
130 211 int64_t ts_start = AV_NOPTS_VALUE;
131 211 int duration = -1;
132 AVPacket *sub;
133
134
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 211 if (!line.str[0]) // EOF
135 3 break;
136
137
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 208 if (read_dialogue(ass, &rline, line.str, &ts_start, &duration) < 0) {
138 157 av_bprintf(&header, "%s", line.str);
139 157 continue;
140 }
141 51 sub = ff_subtitles_queue_insert_bprint(&ass->q, &rline, 0);
142
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 51 if (!sub) {
143 ✗ res = AVERROR(ENOMEM);
144 ✗ goto end;
145 }
146 51 sub->pos = pos;
147 51 sub->pts = ts_start;
148 51 sub->duration = duration;
149 }
150
151 3 res = ff_bprint_to_codecpar_extradata(st->codecpar, &header);
152
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 3 if (res < 0)
153 ✗ goto end;
154
155 3 ff_subtitles_queue_finalize(s, &ass->q);
156
157 3 end:
158 3 av_bprint_finalize(&header, NULL);
159 3 av_bprint_finalize(&line, NULL);
160 3 av_bprint_finalize(&rline, NULL);
161 3 return res;
162 }
163
164 const FFInputFormat ff_ass_demuxer = {
165 .p.name = "ass",
166 .p.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
167 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
168 .priv_data_size = sizeof(ASSContext),
169 .read_probe = ass_probe,
170 .read_header = ass_read_header,
171 .read_packet = ff_subtitles_read_packet,
172 .read_close = ff_subtitles_read_close,
173 .read_seek2 = ff_subtitles_read_seek,
174 };
175