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2ba45a60 DM |
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 | * MicroDVD subtitle decoder | |
24 | * | |
25 | * Based on the specifications found here: | |
26 | * https://trac.videolan.org/vlc/ticket/1825#comment:6 | |
27 | */ | |
28 | ||
29 | #include "libavutil/avstring.h" | |
30 | #include "libavutil/parseutils.h" | |
31 | #include "libavutil/bprint.h" | |
32 | #include "avcodec.h" | |
33 | #include "ass.h" | |
34 | ||
35 | static int indexof(const char *s, int c) | |
36 | { | |
37 | char *f = strchr(s, c); | |
38 | return f ? (f - s) : -1; | |
39 | } | |
40 | ||
41 | struct microdvd_tag { | |
42 | char key; | |
43 | int persistent; | |
44 | uint32_t data1; | |
45 | uint32_t data2; | |
46 | char *data_string; | |
47 | int data_string_len; | |
48 | }; | |
49 | ||
50 | #define MICRODVD_PERSISTENT_OFF 0 | |
51 | #define MICRODVD_PERSISTENT_ON 1 | |
52 | #define MICRODVD_PERSISTENT_OPENED 2 | |
53 | ||
54 | // Color, Font, Size, cHarset, stYle, Position, cOordinate | |
55 | #define MICRODVD_TAGS "cfshyYpo" | |
56 | ||
57 | static void microdvd_set_tag(struct microdvd_tag *tags, struct microdvd_tag tag) | |
58 | { | |
59 | int tag_index = indexof(MICRODVD_TAGS, tag.key); | |
60 | ||
61 | if (tag_index < 0) | |
62 | return; | |
63 | memcpy(&tags[tag_index], &tag, sizeof(tag)); | |
64 | } | |
65 | ||
66 | // italic, bold, underline, strike-through | |
67 | #define MICRODVD_STYLES "ibus" | |
68 | ||
f6fa7814 DM |
69 | /* some samples have lines that start with a / indicating non persistent italic |
70 | * marker */ | |
71 | static char *check_for_italic_slash_marker(struct microdvd_tag *tags, char *s) | |
72 | { | |
73 | if (*s == '/') { | |
74 | struct microdvd_tag tag = tags[indexof(MICRODVD_TAGS, 'y')]; | |
75 | tag.key = 'y'; | |
76 | tag.data1 |= 1 << 0 /* 'i' position in MICRODVD_STYLES */; | |
77 | microdvd_set_tag(tags, tag); | |
78 | s++; | |
79 | } | |
80 | return s; | |
81 | } | |
82 | ||
2ba45a60 DM |
83 | static char *microdvd_load_tags(struct microdvd_tag *tags, char *s) |
84 | { | |
f6fa7814 DM |
85 | s = check_for_italic_slash_marker(tags, s); |
86 | ||
2ba45a60 DM |
87 | while (*s == '{') { |
88 | char *start = s; | |
89 | char tag_char = *(s + 1); | |
90 | struct microdvd_tag tag = {0}; | |
91 | ||
92 | if (!tag_char || *(s + 2) != ':') | |
93 | break; | |
94 | s += 3; | |
95 | ||
96 | switch (tag_char) { | |
97 | ||
98 | /* Style */ | |
99 | case 'Y': | |
100 | tag.persistent = MICRODVD_PERSISTENT_ON; | |
101 | case 'y': | |
102 | while (*s && *s != '}') { | |
103 | int style_index = indexof(MICRODVD_STYLES, *s); | |
104 | ||
105 | if (style_index >= 0) | |
106 | tag.data1 |= (1 << style_index); | |
107 | s++; | |
108 | } | |
109 | if (*s != '}') | |
110 | break; | |
111 | /* We must distinguish persistent and non-persistent styles | |
112 | * to handle this kind of style tags: {y:ib}{Y:us} */ | |
113 | tag.key = tag_char; | |
114 | break; | |
115 | ||
116 | /* Color */ | |
117 | case 'C': | |
118 | tag.persistent = MICRODVD_PERSISTENT_ON; | |
119 | case 'c': | |
f6fa7814 | 120 | while (*s == '$' || *s == '#') |
2ba45a60 DM |
121 | s++; |
122 | tag.data1 = strtol(s, &s, 16) & 0x00ffffff; | |
123 | if (*s != '}') | |
124 | break; | |
125 | tag.key = 'c'; | |
126 | break; | |
127 | ||
128 | /* Font name */ | |
129 | case 'F': | |
130 | tag.persistent = MICRODVD_PERSISTENT_ON; | |
131 | case 'f': { | |
132 | int len = indexof(s, '}'); | |
133 | if (len < 0) | |
134 | break; | |
135 | tag.data_string = s; | |
136 | tag.data_string_len = len; | |
137 | s += len; | |
138 | tag.key = 'f'; | |
139 | break; | |
140 | } | |
141 | ||
142 | /* Font size */ | |
143 | case 'S': | |
144 | tag.persistent = MICRODVD_PERSISTENT_ON; | |
145 | case 's': | |
146 | tag.data1 = strtol(s, &s, 10); | |
147 | if (*s != '}') | |
148 | break; | |
149 | tag.key = 's'; | |
150 | break; | |
151 | ||
152 | /* Charset */ | |
153 | case 'H': { | |
154 | //TODO: not yet handled, just parsed. | |
155 | int len = indexof(s, '}'); | |
156 | if (len < 0) | |
157 | break; | |
158 | tag.data_string = s; | |
159 | tag.data_string_len = len; | |
160 | s += len; | |
161 | tag.key = 'h'; | |
162 | break; | |
163 | } | |
164 | ||
165 | /* Position */ | |
166 | case 'P': | |
167 | tag.persistent = MICRODVD_PERSISTENT_ON; | |
168 | tag.data1 = (*s++ == '1'); | |
169 | if (*s != '}') | |
170 | break; | |
171 | tag.key = 'p'; | |
172 | break; | |
173 | ||
174 | /* Coordinates */ | |
175 | case 'o': | |
176 | tag.persistent = MICRODVD_PERSISTENT_ON; | |
177 | tag.data1 = strtol(s, &s, 10); | |
178 | if (*s != ',') | |
179 | break; | |
180 | s++; | |
181 | tag.data2 = strtol(s, &s, 10); | |
182 | if (*s != '}') | |
183 | break; | |
184 | tag.key = 'o'; | |
185 | break; | |
186 | ||
187 | default: /* Unknown tag, we consider it's text */ | |
188 | break; | |
189 | } | |
190 | ||
191 | if (tag.key == 0) | |
192 | return start; | |
193 | ||
194 | microdvd_set_tag(tags, tag); | |
195 | s++; | |
196 | } | |
f6fa7814 | 197 | return check_for_italic_slash_marker(tags, s); |
2ba45a60 DM |
198 | } |
199 | ||
200 | static void microdvd_open_tags(AVBPrint *new_line, struct microdvd_tag *tags) | |
201 | { | |
202 | int i, sidx; | |
203 | for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) { | |
204 | if (tags[i].persistent == MICRODVD_PERSISTENT_OPENED) | |
205 | continue; | |
206 | switch (tags[i].key) { | |
207 | case 'Y': | |
208 | case 'y': | |
209 | for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++) | |
210 | if (tags[i].data1 & (1 << sidx)) | |
211 | av_bprintf(new_line, "{\\%c1}", MICRODVD_STYLES[sidx]); | |
212 | break; | |
213 | ||
214 | case 'c': | |
215 | av_bprintf(new_line, "{\\c&H%06X&}", tags[i].data1); | |
216 | break; | |
217 | ||
218 | case 'f': | |
219 | av_bprintf(new_line, "{\\fn%.*s}", | |
220 | tags[i].data_string_len, tags[i].data_string); | |
221 | break; | |
222 | ||
223 | case 's': | |
224 | av_bprintf(new_line, "{\\fs%d}", tags[i].data1); | |
225 | break; | |
226 | ||
227 | case 'p': | |
228 | if (tags[i].data1 == 0) | |
229 | av_bprintf(new_line, "{\\an8}"); | |
230 | break; | |
231 | ||
232 | case 'o': | |
233 | av_bprintf(new_line, "{\\pos(%d,%d)}", | |
234 | tags[i].data1, tags[i].data2); | |
235 | break; | |
236 | } | |
237 | if (tags[i].persistent == MICRODVD_PERSISTENT_ON) | |
238 | tags[i].persistent = MICRODVD_PERSISTENT_OPENED; | |
239 | } | |
240 | } | |
241 | ||
242 | static void microdvd_close_no_persistent_tags(AVBPrint *new_line, | |
243 | struct microdvd_tag *tags) | |
244 | { | |
245 | int i, sidx; | |
246 | ||
247 | for (i = sizeof(MICRODVD_TAGS) - 2; i >= 0; i--) { | |
248 | if (tags[i].persistent != MICRODVD_PERSISTENT_OFF) | |
249 | continue; | |
250 | switch (tags[i].key) { | |
251 | ||
252 | case 'y': | |
253 | for (sidx = sizeof(MICRODVD_STYLES) - 2; sidx >= 0; sidx--) | |
254 | if (tags[i].data1 & (1 << sidx)) | |
255 | av_bprintf(new_line, "{\\%c0}", MICRODVD_STYLES[sidx]); | |
256 | break; | |
257 | ||
258 | case 'c': | |
259 | av_bprintf(new_line, "{\\c}"); | |
260 | break; | |
261 | ||
262 | case 'f': | |
263 | av_bprintf(new_line, "{\\fn}"); | |
264 | break; | |
265 | ||
266 | case 's': | |
267 | av_bprintf(new_line, "{\\fs}"); | |
268 | break; | |
269 | } | |
270 | tags[i].key = 0; | |
271 | } | |
272 | } | |
273 | ||
274 | static int microdvd_decode_frame(AVCodecContext *avctx, | |
275 | void *data, int *got_sub_ptr, AVPacket *avpkt) | |
276 | { | |
277 | AVSubtitle *sub = data; | |
278 | AVBPrint new_line; | |
2ba45a60 DM |
279 | char *line = avpkt->data; |
280 | char *end = avpkt->data + avpkt->size; | |
281 | struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}}; | |
282 | ||
283 | if (avpkt->size <= 0) | |
284 | return avpkt->size; | |
285 | ||
2ba45a60 DM |
286 | av_bprint_init(&new_line, 0, 2048); |
287 | ||
288 | // subtitle content | |
289 | while (line < end && *line) { | |
290 | ||
291 | // parse MicroDVD tags, and open them in ASS | |
292 | line = microdvd_load_tags(tags, line); | |
293 | microdvd_open_tags(&new_line, tags); | |
294 | ||
295 | // simple copy until EOL or forced carriage return | |
296 | while (line < end && *line && *line != '|') { | |
297 | av_bprint_chars(&new_line, *line, 1); | |
298 | line++; | |
299 | } | |
300 | ||
301 | // line split | |
302 | if (line < end && *line == '|') { | |
303 | microdvd_close_no_persistent_tags(&new_line, tags); | |
304 | av_bprintf(&new_line, "\\N"); | |
305 | line++; | |
306 | } | |
307 | } | |
308 | if (new_line.len) { | |
f6fa7814 DM |
309 | int ret; |
310 | int64_t start = avpkt->pts; | |
311 | int64_t duration = avpkt->duration; | |
312 | int ts_start = av_rescale_q(start, avctx->time_base, (AVRational){1,100}); | |
313 | int ts_duration = duration != -1 ? | |
314 | av_rescale_q(duration, avctx->time_base, (AVRational){1,100}) : -1; | |
315 | ||
316 | ret = ff_ass_add_rect_bprint(sub, &new_line, ts_start, ts_duration); | |
317 | av_bprint_finalize(&new_line, NULL); | |
318 | if (ret < 0) | |
319 | return ret; | |
2ba45a60 DM |
320 | } |
321 | ||
322 | *got_sub_ptr = sub->num_rects > 0; | |
323 | return avpkt->size; | |
324 | } | |
325 | ||
326 | static int microdvd_init(AVCodecContext *avctx) | |
327 | { | |
328 | int i, sidx; | |
329 | AVBPrint font_buf; | |
330 | int font_size = ASS_DEFAULT_FONT_SIZE; | |
331 | int color = ASS_DEFAULT_COLOR; | |
332 | int bold = ASS_DEFAULT_BOLD; | |
333 | int italic = ASS_DEFAULT_ITALIC; | |
334 | int underline = ASS_DEFAULT_UNDERLINE; | |
335 | int alignment = ASS_DEFAULT_ALIGNMENT; | |
336 | struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}}; | |
337 | ||
338 | av_bprint_init(&font_buf, 0, AV_BPRINT_SIZE_AUTOMATIC); | |
339 | av_bprintf(&font_buf, "%s", ASS_DEFAULT_FONT); | |
340 | ||
341 | if (avctx->extradata) { | |
342 | microdvd_load_tags(tags, avctx->extradata); | |
343 | for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) { | |
344 | switch (av_tolower(tags[i].key)) { | |
345 | case 'y': | |
346 | for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++) { | |
347 | if (tags[i].data1 & (1 << sidx)) { | |
348 | switch (MICRODVD_STYLES[sidx]) { | |
349 | case 'i': italic = 1; break; | |
350 | case 'b': bold = 1; break; | |
351 | case 'u': underline = 1; break; | |
352 | } | |
353 | } | |
354 | } | |
355 | break; | |
356 | ||
357 | case 'c': color = tags[i].data1; break; | |
358 | case 's': font_size = tags[i].data1; break; | |
359 | case 'p': alignment = 8; break; | |
360 | ||
361 | case 'f': | |
362 | av_bprint_clear(&font_buf); | |
363 | av_bprintf(&font_buf, "%.*s", | |
364 | tags[i].data_string_len, tags[i].data_string); | |
365 | break; | |
366 | } | |
367 | } | |
368 | } | |
369 | return ff_ass_subtitle_header(avctx, font_buf.str, font_size, color, | |
370 | ASS_DEFAULT_BACK_COLOR, bold, italic, | |
371 | underline, alignment); | |
372 | } | |
373 | ||
374 | AVCodec ff_microdvd_decoder = { | |
375 | .name = "microdvd", | |
376 | .long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle"), | |
377 | .type = AVMEDIA_TYPE_SUBTITLE, | |
378 | .id = AV_CODEC_ID_MICRODVD, | |
379 | .init = microdvd_init, | |
380 | .decode = microdvd_decode_frame, | |
381 | }; |