blob: af084f48560ddfae970d41204786719d1404c05a
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 demuxer |
24 | * @see https://en.wikipedia.org/wiki/SubViewer |
25 | */ |
26 | |
27 | #include "avformat.h" |
28 | #include "internal.h" |
29 | #include "subtitles.h" |
30 | #include "libavcodec/internal.h" |
31 | #include "libavutil/avstring.h" |
32 | #include "libavutil/bprint.h" |
33 | #include "libavutil/intreadwrite.h" |
34 | |
35 | typedef struct { |
36 | FFDemuxSubtitlesQueue q; |
37 | } SubViewerContext; |
38 | |
39 | static int subviewer_probe(AVProbeData *p) |
40 | { |
41 | char c; |
42 | const unsigned char *ptr = p->buf; |
43 | |
44 | if (AV_RB24(ptr) == 0xEFBBBF) |
45 | ptr += 3; /* skip UTF-8 BOM */ |
46 | if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) |
47 | return AVPROBE_SCORE_EXTENSION; |
48 | if (!strncmp(ptr, "[INFORMATION]", 13)) |
49 | return AVPROBE_SCORE_MAX/3; |
50 | return 0; |
51 | } |
52 | |
53 | static int read_ts(const char *s, int64_t *start, int *duration) |
54 | { |
55 | int64_t end; |
56 | int hh1, mm1, ss1, ms1; |
57 | int hh2, mm2, ss2, ms2; |
58 | |
59 | if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u", |
60 | &hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2) == 8) { |
61 | end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2; |
62 | *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1; |
63 | *duration = end - *start; |
64 | return 0; |
65 | } |
66 | return -1; |
67 | } |
68 | |
69 | static int subviewer_read_header(AVFormatContext *s) |
70 | { |
71 | SubViewerContext *subviewer = s->priv_data; |
72 | AVStream *st = avformat_new_stream(s, NULL); |
73 | AVBPrint header; |
74 | int res = 0, new_event = 1; |
75 | int64_t pts_start = AV_NOPTS_VALUE; |
76 | int duration = -1; |
77 | AVPacket *sub = NULL; |
78 | |
79 | if (!st) |
80 | return AVERROR(ENOMEM); |
81 | avpriv_set_pts_info(st, 64, 1, 100); |
82 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
83 | st->codecpar->codec_id = AV_CODEC_ID_SUBVIEWER; |
84 | |
85 | av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); |
86 | |
87 | while (!avio_feof(s->pb)) { |
88 | char line[2048]; |
89 | int64_t pos = 0; |
90 | int len = ff_get_line(s->pb, line, sizeof(line)); |
91 | |
92 | if (!len) |
93 | break; |
94 | |
95 | line[strcspn(line, "\r\n")] = 0; |
96 | |
97 | if (line[0] == '[' && strncmp(line, "[br]", 4)) { |
98 | |
99 | /* ignore event style, XXX: add to side_data? */ |
100 | if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") || |
101 | strstr(line, "[FONT]") || strstr(line, "[STYLE]")) |
102 | continue; |
103 | |
104 | if (!st->codecpar->extradata) { // header not finalized yet |
105 | av_bprintf(&header, "%s\n", line); |
106 | if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) { |
107 | /* end of header */ |
108 | res = ff_bprint_to_codecpar_extradata(st->codecpar, &header); |
109 | if (res < 0) |
110 | goto end; |
111 | } else if (strncmp(line, "[INFORMATION]", 13)) { |
112 | /* assume file metadata at this point */ |
113 | int i, j = 0; |
114 | char key[32], value[128]; |
115 | |
116 | for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++) |
117 | key[i - 1] = av_tolower(line[i]); |
118 | key[i - 1] = 0; |
119 | |
120 | if (line[i] == ']') |
121 | i++; |
122 | while (line[i] == ' ') |
123 | i++; |
124 | while (j < sizeof(value) - 1 && line[i] && line[i] != ']') |
125 | value[j++] = line[i++]; |
126 | value[j] = 0; |
127 | |
128 | av_dict_set(&s->metadata, key, value, 0); |
129 | } |
130 | } |
131 | } else if (read_ts(line, &pts_start, &duration) >= 0) { |
132 | new_event = 1; |
133 | pos = avio_tell(s->pb); |
134 | } else if (*line) { |
135 | if (!new_event) { |
136 | sub = ff_subtitles_queue_insert(&subviewer->q, "\n", 1, 1); |
137 | if (!sub) { |
138 | res = AVERROR(ENOMEM); |
139 | goto end; |
140 | } |
141 | } |
142 | sub = ff_subtitles_queue_insert(&subviewer->q, line, strlen(line), !new_event); |
143 | if (!sub) { |
144 | res = AVERROR(ENOMEM); |
145 | goto end; |
146 | } |
147 | if (new_event) { |
148 | sub->pos = pos; |
149 | sub->pts = pts_start; |
150 | sub->duration = duration; |
151 | } |
152 | new_event = 0; |
153 | } |
154 | } |
155 | |
156 | ff_subtitles_queue_finalize(s, &subviewer->q); |
157 | |
158 | end: |
159 | av_bprint_finalize(&header, NULL); |
160 | return res; |
161 | } |
162 | |
163 | static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt) |
164 | { |
165 | SubViewerContext *subviewer = s->priv_data; |
166 | return ff_subtitles_queue_read_packet(&subviewer->q, pkt); |
167 | } |
168 | |
169 | static int subviewer_read_seek(AVFormatContext *s, int stream_index, |
170 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
171 | { |
172 | SubViewerContext *subviewer = s->priv_data; |
173 | return ff_subtitles_queue_seek(&subviewer->q, s, stream_index, |
174 | min_ts, ts, max_ts, flags); |
175 | } |
176 | |
177 | static int subviewer_read_close(AVFormatContext *s) |
178 | { |
179 | SubViewerContext *subviewer = s->priv_data; |
180 | ff_subtitles_queue_clean(&subviewer->q); |
181 | return 0; |
182 | } |
183 | |
184 | AVInputFormat ff_subviewer_demuxer = { |
185 | .name = "subviewer", |
186 | .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"), |
187 | .priv_data_size = sizeof(SubViewerContext), |
188 | .read_probe = subviewer_probe, |
189 | .read_header = subviewer_read_header, |
190 | .read_packet = subviewer_read_packet, |
191 | .read_seek2 = subviewer_read_seek, |
192 | .read_close = subviewer_read_close, |
193 | .extensions = "sub", |
194 | }; |
195 |