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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 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->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
83 | st->codec->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->codec->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 = avpriv_bprint_to_extradata(st->codec, &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(&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 | }; |