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2ba45a60 DM |
1 | /* |
2 | * SSA/ASS spliting functions | |
3 | * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "avcodec.h" | |
23 | #include "ass_split.h" | |
24 | ||
25 | typedef enum { | |
26 | ASS_STR, | |
27 | ASS_INT, | |
28 | ASS_FLT, | |
29 | ASS_COLOR, | |
30 | ASS_TIMESTAMP, | |
31 | ASS_ALGN, | |
32 | } ASSFieldType; | |
33 | ||
34 | typedef struct { | |
35 | const char *name; | |
36 | int type; | |
37 | int offset; | |
38 | } ASSFields; | |
39 | ||
40 | typedef struct { | |
41 | const char *section; | |
42 | const char *format_header; | |
43 | const char *fields_header; | |
44 | int size; | |
45 | int offset; | |
46 | int offset_count; | |
47 | ASSFields fields[10]; | |
48 | } ASSSection; | |
49 | ||
50 | static const ASSSection ass_sections[] = { | |
51 | { .section = "Script Info", | |
52 | .offset = offsetof(ASS, script_info), | |
53 | .fields = {{"ScriptType", ASS_STR, offsetof(ASSScriptInfo, script_type)}, | |
54 | {"Collisions", ASS_STR, offsetof(ASSScriptInfo, collisions) }, | |
55 | {"PlayResX", ASS_INT, offsetof(ASSScriptInfo, play_res_x) }, | |
56 | {"PlayResY", ASS_INT, offsetof(ASSScriptInfo, play_res_y) }, | |
57 | {"Timer", ASS_FLT, offsetof(ASSScriptInfo, timer) }, | |
58 | {0}, | |
59 | } | |
60 | }, | |
61 | { .section = "V4+ Styles", | |
62 | .format_header = "Format", | |
63 | .fields_header = "Style", | |
64 | .size = sizeof(ASSStyle), | |
65 | .offset = offsetof(ASS, styles), | |
66 | .offset_count = offsetof(ASS, styles_count), | |
67 | .fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) }, | |
68 | {"Fontname", ASS_STR, offsetof(ASSStyle, font_name) }, | |
69 | {"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) }, | |
70 | {"PrimaryColour",ASS_COLOR,offsetof(ASSStyle, primary_color)}, | |
71 | {"BackColour", ASS_COLOR,offsetof(ASSStyle, back_color) }, | |
72 | {"Bold", ASS_INT, offsetof(ASSStyle, bold) }, | |
73 | {"Italic", ASS_INT, offsetof(ASSStyle, italic) }, | |
74 | {"Underline", ASS_INT, offsetof(ASSStyle, underline) }, | |
75 | {"Alignment", ASS_INT, offsetof(ASSStyle, alignment) }, | |
76 | {0}, | |
77 | } | |
78 | }, | |
79 | { .section = "V4 Styles", | |
80 | .format_header = "Format", | |
81 | .fields_header = "Style", | |
82 | .size = sizeof(ASSStyle), | |
83 | .offset = offsetof(ASS, styles), | |
84 | .offset_count = offsetof(ASS, styles_count), | |
85 | .fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) }, | |
86 | {"Fontname", ASS_STR, offsetof(ASSStyle, font_name) }, | |
87 | {"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) }, | |
88 | {"PrimaryColour",ASS_COLOR,offsetof(ASSStyle, primary_color)}, | |
89 | {"BackColour", ASS_COLOR,offsetof(ASSStyle, back_color) }, | |
90 | {"Bold", ASS_INT, offsetof(ASSStyle, bold) }, | |
91 | {"Italic", ASS_INT, offsetof(ASSStyle, italic) }, | |
92 | {"Alignment", ASS_ALGN, offsetof(ASSStyle, alignment) }, | |
93 | {0}, | |
94 | } | |
95 | }, | |
96 | { .section = "Events", | |
97 | .format_header = "Format", | |
98 | .fields_header = "Dialogue", | |
99 | .size = sizeof(ASSDialog), | |
100 | .offset = offsetof(ASS, dialogs), | |
101 | .offset_count = offsetof(ASS, dialogs_count), | |
102 | .fields = {{"Layer", ASS_INT, offsetof(ASSDialog, layer) }, | |
103 | {"Start", ASS_TIMESTAMP, offsetof(ASSDialog, start) }, | |
104 | {"End", ASS_TIMESTAMP, offsetof(ASSDialog, end) }, | |
105 | {"Style", ASS_STR, offsetof(ASSDialog, style) }, | |
106 | {"Text", ASS_STR, offsetof(ASSDialog, text) }, | |
107 | {0}, | |
108 | } | |
109 | }, | |
110 | }; | |
111 | ||
112 | ||
113 | typedef int (*ASSConvertFunc)(void *dest, const char *buf, int len); | |
114 | ||
115 | static int convert_str(void *dest, const char *buf, int len) | |
116 | { | |
117 | char *str = av_malloc(len + 1); | |
118 | if (str) { | |
119 | memcpy(str, buf, len); | |
120 | str[len] = 0; | |
121 | if (*(void **)dest) | |
122 | av_free(*(void **)dest); | |
123 | *(char **)dest = str; | |
124 | } | |
125 | return !str; | |
126 | } | |
127 | static int convert_int(void *dest, const char *buf, int len) | |
128 | { | |
129 | return sscanf(buf, "%d", (int *)dest) == 1; | |
130 | } | |
131 | static int convert_flt(void *dest, const char *buf, int len) | |
132 | { | |
133 | return sscanf(buf, "%f", (float *)dest) == 1; | |
134 | } | |
135 | static int convert_color(void *dest, const char *buf, int len) | |
136 | { | |
137 | return sscanf(buf, "&H%8x", (int *)dest) == 1 || | |
138 | sscanf(buf, "%d", (int *)dest) == 1; | |
139 | } | |
140 | static int convert_timestamp(void *dest, const char *buf, int len) | |
141 | { | |
142 | int c, h, m, s, cs; | |
143 | if ((c = sscanf(buf, "%d:%02d:%02d.%02d", &h, &m, &s, &cs)) == 4) | |
144 | *(int *)dest = 360000*h + 6000*m + 100*s + cs; | |
145 | return c == 4; | |
146 | } | |
147 | static int convert_alignment(void *dest, const char *buf, int len) | |
148 | { | |
149 | int a; | |
150 | if (sscanf(buf, "%d", &a) == 1) { | |
151 | /* convert V4 Style alignment to V4+ Style */ | |
152 | *(int *)dest = a + ((a&4) >> 1) - 5*!!(a&8); | |
153 | return 1; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static const ASSConvertFunc convert_func[] = { | |
159 | [ASS_STR] = convert_str, | |
160 | [ASS_INT] = convert_int, | |
161 | [ASS_FLT] = convert_flt, | |
162 | [ASS_COLOR] = convert_color, | |
163 | [ASS_TIMESTAMP] = convert_timestamp, | |
164 | [ASS_ALGN] = convert_alignment, | |
165 | }; | |
166 | ||
167 | ||
168 | struct ASSSplitContext { | |
169 | ASS ass; | |
170 | int current_section; | |
171 | int field_number[FF_ARRAY_ELEMS(ass_sections)]; | |
172 | int *field_order[FF_ARRAY_ELEMS(ass_sections)]; | |
173 | }; | |
174 | ||
175 | ||
176 | static uint8_t *realloc_section_array(ASSSplitContext *ctx) | |
177 | { | |
178 | const ASSSection *section = &ass_sections[ctx->current_section]; | |
179 | int *count = (int *)((uint8_t *)&ctx->ass + section->offset_count); | |
180 | void **section_ptr = (void **)((uint8_t *)&ctx->ass + section->offset); | |
181 | uint8_t *tmp = av_realloc(*section_ptr, (*count+1)*section->size); | |
182 | if (!tmp) | |
183 | return NULL; | |
184 | *section_ptr = tmp; | |
185 | tmp += *count * section->size; | |
186 | memset(tmp, 0, section->size); | |
187 | (*count)++; | |
188 | return tmp; | |
189 | } | |
190 | ||
191 | static inline int is_eol(char buf) | |
192 | { | |
193 | return buf == '\r' || buf == '\n' || buf == 0; | |
194 | } | |
195 | ||
196 | static inline const char *skip_space(const char *buf) | |
197 | { | |
198 | while (*buf == ' ') | |
199 | buf++; | |
200 | return buf; | |
201 | } | |
202 | ||
203 | static const char *ass_split_section(ASSSplitContext *ctx, const char *buf) | |
204 | { | |
205 | const ASSSection *section = &ass_sections[ctx->current_section]; | |
206 | int *number = &ctx->field_number[ctx->current_section]; | |
207 | int *order = ctx->field_order[ctx->current_section]; | |
208 | int *tmp, i, len; | |
209 | ||
210 | while (buf && *buf) { | |
211 | if (buf[0] == '[') { | |
212 | ctx->current_section = -1; | |
213 | break; | |
214 | } | |
215 | if (buf[0] == ';' || (buf[0] == '!' && buf[1] == ':')) { | |
216 | /* skip comments */ | |
217 | } else if (section->format_header && !order) { | |
218 | len = strlen(section->format_header); | |
219 | if (strncmp(buf, section->format_header, len) || buf[len] != ':') | |
220 | return NULL; | |
221 | buf += len + 1; | |
222 | while (!is_eol(*buf)) { | |
223 | buf = skip_space(buf); | |
224 | len = strcspn(buf, ", \r\n"); | |
225 | if (!(tmp = av_realloc(order, (*number + 1) * sizeof(*order)))) | |
226 | return NULL; | |
227 | order = tmp; | |
228 | order[*number] = -1; | |
229 | for (i=0; section->fields[i].name; i++) | |
230 | if (!strncmp(buf, section->fields[i].name, len)) { | |
231 | order[*number] = i; | |
232 | break; | |
233 | } | |
234 | (*number)++; | |
235 | buf = skip_space(buf + len + (buf[len] == ',')); | |
236 | } | |
237 | ctx->field_order[ctx->current_section] = order; | |
238 | } else if (section->fields_header) { | |
239 | len = strlen(section->fields_header); | |
240 | if (!strncmp(buf, section->fields_header, len) && buf[len] == ':') { | |
241 | uint8_t *ptr, *struct_ptr = realloc_section_array(ctx); | |
242 | if (!struct_ptr) return NULL; | |
243 | buf += len + 1; | |
244 | for (i=0; !is_eol(*buf) && i < *number; i++) { | |
245 | int last = i == *number - 1; | |
246 | buf = skip_space(buf); | |
247 | len = strcspn(buf, last ? "\r\n" : ",\r\n"); | |
248 | if (order[i] >= 0) { | |
249 | ASSFieldType type = section->fields[order[i]].type; | |
250 | ptr = struct_ptr + section->fields[order[i]].offset; | |
251 | convert_func[type](ptr, buf, len); | |
252 | } | |
253 | buf += len; | |
254 | if (!last && *buf) buf++; | |
255 | buf = skip_space(buf); | |
256 | } | |
257 | } | |
258 | } else { | |
259 | len = strcspn(buf, ":\r\n"); | |
260 | if (buf[len] == ':') { | |
261 | for (i=0; section->fields[i].name; i++) | |
262 | if (!strncmp(buf, section->fields[i].name, len)) { | |
263 | ASSFieldType type = section->fields[i].type; | |
264 | uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset; | |
265 | ptr += section->fields[i].offset; | |
266 | buf = skip_space(buf + len + 1); | |
267 | convert_func[type](ptr, buf, strcspn(buf, "\r\n")); | |
268 | break; | |
269 | } | |
270 | } | |
271 | } | |
272 | buf += strcspn(buf, "\n"); | |
273 | buf += !!*buf; | |
274 | } | |
275 | return buf; | |
276 | } | |
277 | ||
278 | static int ass_split(ASSSplitContext *ctx, const char *buf) | |
279 | { | |
280 | char c, section[16]; | |
281 | int i; | |
282 | ||
283 | if (ctx->current_section >= 0) | |
284 | buf = ass_split_section(ctx, buf); | |
285 | ||
286 | while (buf && *buf) { | |
287 | if (sscanf(buf, "[%15[0-9A-Za-z+ ]]%c", section, &c) == 2) { | |
288 | buf += strcspn(buf, "\n"); | |
289 | buf += !!*buf; | |
290 | for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++) | |
291 | if (!strcmp(section, ass_sections[i].section)) { | |
292 | ctx->current_section = i; | |
293 | buf = ass_split_section(ctx, buf); | |
294 | } | |
295 | } else { | |
296 | buf += strcspn(buf, "\n"); | |
297 | buf += !!*buf; | |
298 | } | |
299 | } | |
300 | return buf ? 0 : AVERROR_INVALIDDATA; | |
301 | } | |
302 | ||
303 | ASSSplitContext *ff_ass_split(const char *buf) | |
304 | { | |
305 | ASSSplitContext *ctx = av_mallocz(sizeof(*ctx)); | |
306 | ctx->current_section = -1; | |
307 | if (ass_split(ctx, buf) < 0) { | |
308 | ff_ass_split_free(ctx); | |
309 | return NULL; | |
310 | } | |
311 | return ctx; | |
312 | } | |
313 | ||
314 | static void free_section(ASSSplitContext *ctx, const ASSSection *section) | |
315 | { | |
316 | uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset; | |
317 | int i, j, *count, c = 1; | |
318 | ||
319 | if (section->format_header) { | |
320 | ptr = *(void **)ptr; | |
321 | count = (int *)((uint8_t *)&ctx->ass + section->offset_count); | |
322 | } else | |
323 | count = &c; | |
324 | ||
325 | if (ptr) | |
326 | for (i=0; i<*count; i++, ptr += section->size) | |
327 | for (j=0; section->fields[j].name; j++) { | |
328 | const ASSFields *field = §ion->fields[j]; | |
329 | if (field->type == ASS_STR) | |
330 | av_freep(ptr + field->offset); | |
331 | } | |
332 | *count = 0; | |
333 | ||
334 | if (section->format_header) | |
335 | av_freep((uint8_t *)&ctx->ass + section->offset); | |
336 | } | |
337 | ||
338 | ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf, | |
339 | int cache, int *number) | |
340 | { | |
341 | ASSDialog *dialog = NULL; | |
342 | int i, count; | |
343 | if (!cache) | |
344 | for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++) | |
345 | if (!strcmp(ass_sections[i].section, "Events")) { | |
346 | free_section(ctx, &ass_sections[i]); | |
347 | break; | |
348 | } | |
349 | count = ctx->ass.dialogs_count; | |
350 | if (ass_split(ctx, buf) == 0) | |
351 | dialog = ctx->ass.dialogs + count; | |
352 | if (number) | |
353 | *number = ctx->ass.dialogs_count - count; | |
354 | return dialog; | |
355 | } | |
356 | ||
357 | void ff_ass_split_free(ASSSplitContext *ctx) | |
358 | { | |
359 | if (ctx) { | |
360 | int i; | |
361 | for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++) { | |
362 | free_section(ctx, &ass_sections[i]); | |
363 | av_freep(&(ctx->field_order[i])); | |
364 | } | |
365 | av_free(ctx); | |
366 | } | |
367 | } | |
368 | ||
369 | ||
370 | int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv, | |
371 | const char *buf) | |
372 | { | |
373 | const char *text = NULL; | |
374 | char new_line[2]; | |
375 | int text_len = 0; | |
376 | ||
377 | while (buf && *buf) { | |
378 | if (text && callbacks->text && | |
379 | (sscanf(buf, "\\%1[nN]", new_line) == 1 || | |
380 | !strncmp(buf, "{\\", 2))) { | |
381 | callbacks->text(priv, text, text_len); | |
382 | text = NULL; | |
383 | } | |
384 | if (sscanf(buf, "\\%1[nN]", new_line) == 1) { | |
385 | if (callbacks->new_line) | |
386 | callbacks->new_line(priv, new_line[0] == 'N'); | |
387 | buf += 2; | |
388 | } else if (!strncmp(buf, "{\\", 2)) { | |
389 | buf++; | |
390 | while (*buf == '\\') { | |
391 | char style[2], c[2], sep[2], c_num[2] = "0", tmp[128] = {0}; | |
392 | unsigned int color = 0xFFFFFFFF; | |
393 | int len, size = -1, an = -1, alpha = -1; | |
394 | int x1, y1, x2, y2, t1 = -1, t2 = -1; | |
395 | if (sscanf(buf, "\\%1[bisu]%1[01\\}]%n", style, c, &len) > 1) { | |
396 | int close = c[0] == '0' ? 1 : c[0] == '1' ? 0 : -1; | |
397 | len += close != -1; | |
398 | if (callbacks->style) | |
399 | callbacks->style(priv, style[0], close); | |
400 | } else if (sscanf(buf, "\\c%1[\\}]%n", sep, &len) > 0 || | |
401 | sscanf(buf, "\\c&H%X&%1[\\}]%n", &color, sep, &len) > 1 || | |
402 | sscanf(buf, "\\%1[1234]c%1[\\}]%n", c_num, sep, &len) > 1 || | |
403 | sscanf(buf, "\\%1[1234]c&H%X&%1[\\}]%n", c_num, &color, sep, &len) > 2) { | |
404 | if (callbacks->color) | |
405 | callbacks->color(priv, color, c_num[0] - '0'); | |
406 | } else if (sscanf(buf, "\\alpha%1[\\}]%n", sep, &len) > 0 || | |
407 | sscanf(buf, "\\alpha&H%2X&%1[\\}]%n", &alpha, sep, &len) > 1 || | |
408 | sscanf(buf, "\\%1[1234]a%1[\\}]%n", c_num, sep, &len) > 1 || | |
409 | sscanf(buf, "\\%1[1234]a&H%2X&%1[\\}]%n", c_num, &alpha, sep, &len) > 2) { | |
410 | if (callbacks->alpha) | |
411 | callbacks->alpha(priv, alpha, c_num[0] - '0'); | |
412 | } else if (sscanf(buf, "\\fn%1[\\}]%n", sep, &len) > 0 || | |
413 | sscanf(buf, "\\fn%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) { | |
414 | if (callbacks->font_name) | |
415 | callbacks->font_name(priv, tmp[0] ? tmp : NULL); | |
416 | } else if (sscanf(buf, "\\fs%1[\\}]%n", sep, &len) > 0 || | |
417 | sscanf(buf, "\\fs%u%1[\\}]%n", &size, sep, &len) > 1) { | |
418 | if (callbacks->font_size) | |
419 | callbacks->font_size(priv, size); | |
420 | } else if (sscanf(buf, "\\a%1[\\}]%n", sep, &len) > 0 || | |
421 | sscanf(buf, "\\a%2u%1[\\}]%n", &an, sep, &len) > 1 || | |
422 | sscanf(buf, "\\an%1[\\}]%n", sep, &len) > 0 || | |
423 | sscanf(buf, "\\an%1u%1[\\}]%n", &an, sep, &len) > 1) { | |
424 | if (an != -1 && buf[2] != 'n') | |
425 | an = (an&3) + (an&4 ? 6 : an&8 ? 3 : 0); | |
426 | if (callbacks->alignment) | |
427 | callbacks->alignment(priv, an); | |
428 | } else if (sscanf(buf, "\\r%1[\\}]%n", sep, &len) > 0 || | |
429 | sscanf(buf, "\\r%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) { | |
430 | if (callbacks->cancel_overrides) | |
431 | callbacks->cancel_overrides(priv, tmp); | |
432 | } else if (sscanf(buf, "\\move(%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, sep, &len) > 4 || | |
433 | sscanf(buf, "\\move(%d,%d,%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, &t1, &t2, sep, &len) > 6) { | |
434 | if (callbacks->move) | |
435 | callbacks->move(priv, x1, y1, x2, y2, t1, t2); | |
436 | } else if (sscanf(buf, "\\pos(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) { | |
437 | if (callbacks->move) | |
438 | callbacks->move(priv, x1, y1, x1, y1, -1, -1); | |
439 | } else if (sscanf(buf, "\\org(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) { | |
440 | if (callbacks->origin) | |
441 | callbacks->origin(priv, x1, y1); | |
442 | } else { | |
443 | len = strcspn(buf+1, "\\}") + 2; /* skip unknown code */ | |
444 | } | |
445 | buf += len - 1; | |
446 | } | |
447 | if (*buf++ != '}') | |
448 | return AVERROR_INVALIDDATA; | |
449 | } else { | |
450 | if (!text) { | |
451 | text = buf; | |
452 | text_len = 1; | |
453 | } else | |
454 | text_len++; | |
455 | buf++; | |
456 | } | |
457 | } | |
458 | if (text && callbacks->text) | |
459 | callbacks->text(priv, text, text_len); | |
460 | if (callbacks->end) | |
461 | callbacks->end(priv); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | ASSStyle *ff_ass_style_get(ASSSplitContext *ctx, const char *style) | |
466 | { | |
467 | ASS *ass = &ctx->ass; | |
468 | int i; | |
469 | ||
470 | if (!style || !*style) | |
471 | style = "Default"; | |
472 | for (i=0; i<ass->styles_count; i++) | |
473 | if (!strcmp(ass->styles[i].name, style)) | |
474 | return ass->styles + i; | |
475 | return NULL; | |
476 | } |