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2ba45a60 DM |
1 | /* |
2 | * MicroDVD subtitle demuxer | |
3 | * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> | |
4 | * Copyright (c) 2012 Clément Bœsch <u pkh me> | |
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 "avformat.h" | |
24 | #include "internal.h" | |
25 | #include "subtitles.h" | |
26 | #include "libavutil/intreadwrite.h" | |
27 | #include "libavutil/opt.h" | |
28 | ||
29 | #define MAX_LINESIZE 2048 | |
30 | ||
31 | ||
32 | typedef struct { | |
33 | const AVClass *class; | |
34 | FFDemuxSubtitlesQueue q; | |
35 | AVRational frame_rate; | |
36 | } MicroDVDContext; | |
37 | ||
38 | ||
39 | static int microdvd_probe(AVProbeData *p) | |
40 | { | |
41 | unsigned char c; | |
42 | const uint8_t *ptr = p->buf; | |
43 | int i; | |
44 | ||
45 | if (AV_RB24(ptr) == 0xEFBBBF) | |
46 | ptr += 3; /* skip UTF-8 BOM */ | |
47 | ||
48 | for (i=0; i<3; i++) { | |
49 | if (sscanf(ptr, "{%*d}{}%c", &c) != 1 && | |
50 | sscanf(ptr, "{%*d}{%*d}%c", &c) != 1 && | |
51 | sscanf(ptr, "{DEFAULT}{}%c", &c) != 1) | |
52 | return 0; | |
53 | ptr += ff_subtitles_next_line(ptr); | |
54 | } | |
55 | return AVPROBE_SCORE_MAX; | |
56 | } | |
57 | ||
58 | static int64_t get_pts(const char *buf) | |
59 | { | |
60 | int frame; | |
61 | char c; | |
62 | ||
63 | if (sscanf(buf, "{%d}{%c", &frame, &c) == 2) | |
64 | return frame; | |
65 | return AV_NOPTS_VALUE; | |
66 | } | |
67 | ||
68 | static int get_duration(const char *buf) | |
69 | { | |
70 | int frame_start, frame_end; | |
71 | ||
72 | if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2) | |
73 | return frame_end - frame_start; | |
74 | return -1; | |
75 | } | |
76 | ||
77 | static const char *bom = "\xEF\xBB\xBF"; | |
78 | ||
79 | static int microdvd_read_header(AVFormatContext *s) | |
80 | { | |
81 | AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */ | |
82 | MicroDVDContext *microdvd = s->priv_data; | |
83 | AVStream *st = avformat_new_stream(s, NULL); | |
84 | int i = 0; | |
85 | char line_buf[MAX_LINESIZE]; | |
86 | int has_real_fps = 0; | |
87 | ||
88 | if (!st) | |
89 | return AVERROR(ENOMEM); | |
90 | ||
91 | while (!avio_feof(s->pb)) { | |
92 | char *p; | |
93 | AVPacket *sub; | |
94 | int64_t pos = avio_tell(s->pb); | |
95 | int len = ff_get_line(s->pb, line_buf, sizeof(line_buf)); | |
96 | char *line = line_buf; | |
97 | ||
98 | if (!strncmp(line, bom, 3)) | |
99 | line += 3; | |
100 | p = line; | |
101 | ||
102 | if (!len) | |
103 | break; | |
104 | line[strcspn(line, "\r\n")] = 0; | |
105 | if (i++ < 3) { | |
106 | int frame; | |
107 | double fps; | |
108 | char c; | |
109 | ||
110 | if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 || | |
111 | sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2) | |
112 | && frame <= 1 && fps > 3 && fps < 100) { | |
113 | pts_info = av_d2q(fps, 100000); | |
114 | has_real_fps = 1; | |
115 | } | |
116 | if (!st->codec->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) { | |
117 | st->codec->extradata = av_strdup(line + 11); | |
118 | if (!st->codec->extradata) | |
119 | return AVERROR(ENOMEM); | |
120 | st->codec->extradata_size = strlen(st->codec->extradata) + 1; | |
121 | continue; | |
122 | } | |
123 | } | |
124 | #define SKIP_FRAME_ID \ | |
125 | p = strchr(p, '}'); \ | |
126 | if (!p) { \ | |
127 | av_log(s, AV_LOG_WARNING, "Invalid event \"%s\"" \ | |
128 | " at line %d\n", line, i); \ | |
129 | continue; \ | |
130 | } \ | |
131 | p++ | |
132 | SKIP_FRAME_ID; | |
133 | SKIP_FRAME_ID; | |
134 | if (!*p) | |
135 | continue; | |
136 | sub = ff_subtitles_queue_insert(µdvd->q, p, strlen(p), 0); | |
137 | if (!sub) | |
138 | return AVERROR(ENOMEM); | |
139 | sub->pos = pos; | |
140 | sub->pts = get_pts(line); | |
141 | sub->duration = get_duration(line); | |
142 | } | |
143 | ff_subtitles_queue_finalize(µdvd->q); | |
144 | if (has_real_fps) { | |
145 | /* export the FPS info only if set in the file */ | |
146 | microdvd->frame_rate = pts_info; | |
147 | } else if (microdvd->frame_rate.num) { | |
148 | /* fallback on user specified frame rate */ | |
149 | pts_info = microdvd->frame_rate; | |
150 | } | |
151 | avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num); | |
152 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
153 | st->codec->codec_id = AV_CODEC_ID_MICRODVD; | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt) | |
158 | { | |
159 | MicroDVDContext *microdvd = s->priv_data; | |
160 | return ff_subtitles_queue_read_packet(µdvd->q, pkt); | |
161 | } | |
162 | ||
163 | static int microdvd_read_seek(AVFormatContext *s, int stream_index, | |
164 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
165 | { | |
166 | MicroDVDContext *microdvd = s->priv_data; | |
167 | return ff_subtitles_queue_seek(µdvd->q, s, stream_index, | |
168 | min_ts, ts, max_ts, flags); | |
169 | } | |
170 | ||
171 | static int microdvd_read_close(AVFormatContext *s) | |
172 | { | |
173 | MicroDVDContext *microdvd = s->priv_data; | |
174 | ff_subtitles_queue_clean(µdvd->q); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | ||
179 | #define OFFSET(x) offsetof(MicroDVDContext, x) | |
180 | #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM | |
181 | static const AVOption microdvd_options[] = { | |
182 | { "subfps", "set the movie frame rate fallback", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, SD }, | |
183 | { NULL } | |
184 | }; | |
185 | ||
186 | static const AVClass microdvd_class = { | |
187 | .class_name = "microdvddec", | |
188 | .item_name = av_default_item_name, | |
189 | .option = microdvd_options, | |
190 | .version = LIBAVUTIL_VERSION_INT, | |
191 | }; | |
192 | ||
193 | AVInputFormat ff_microdvd_demuxer = { | |
194 | .name = "microdvd", | |
195 | .long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"), | |
196 | .priv_data_size = sizeof(MicroDVDContext), | |
197 | .read_probe = microdvd_probe, | |
198 | .read_header = microdvd_read_header, | |
199 | .read_packet = microdvd_read_packet, | |
200 | .read_seek2 = microdvd_read_seek, | |
201 | .read_close = microdvd_read_close, | |
202 | .priv_class = µdvd_class, | |
203 | }; |