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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavcodec / ass_split.c
CommitLineData
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
25typedef enum {
26 ASS_STR,
27 ASS_INT,
28 ASS_FLT,
29 ASS_COLOR,
30 ASS_TIMESTAMP,
31 ASS_ALGN,
32} ASSFieldType;
33
34typedef struct {
35 const char *name;
36 int type;
37 int offset;
38} ASSFields;
39
40typedef 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;
f6fa7814 47 ASSFields fields[24];
2ba45a60
DM		 48} ASSSection;
49
50static 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),
f6fa7814
DM		 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 {"SecondaryColour", ASS_COLOR, offsetof(ASSStyle, secondary_color)},
72 {"OutlineColour", ASS_COLOR, offsetof(ASSStyle, outline_color) },
73 {"BackColour", ASS_COLOR, offsetof(ASSStyle, back_color) },
74 {"Bold", ASS_INT, offsetof(ASSStyle, bold) },
75 {"Italic", ASS_INT, offsetof(ASSStyle, italic) },
76 {"Underline", ASS_INT, offsetof(ASSStyle, underline) },
77 {"StrikeOut", ASS_INT, offsetof(ASSStyle, strikeout) },
78 {"ScaleX", ASS_FLT, offsetof(ASSStyle, scalex) },
79 {"ScaleY", ASS_FLT, offsetof(ASSStyle, scaley) },
80 {"Spacing", ASS_FLT, offsetof(ASSStyle, spacing) },
81 {"Angle", ASS_FLT, offsetof(ASSStyle, angle) },
82 {"BorderStyle", ASS_INT, offsetof(ASSStyle, border_style) },
83 {"Outline", ASS_FLT, offsetof(ASSStyle, outline) },
84 {"Shadow", ASS_FLT, offsetof(ASSStyle, shadow) },
85 {"Alignment", ASS_INT, offsetof(ASSStyle, alignment) },
86 {"MarginL", ASS_INT, offsetof(ASSStyle, margin_l) },
87 {"MarginR", ASS_INT, offsetof(ASSStyle, margin_r) },
88 {"MarginV", ASS_INT, offsetof(ASSStyle, margin_v) },
89 {"Encoding", ASS_INT, offsetof(ASSStyle, encoding) },
2ba45a60
DM		 90 {0},
91 }
92 },
93 { .section = "V4 Styles",
94 .format_header = "Format",
95 .fields_header = "Style",
96 .size = sizeof(ASSStyle),
97 .offset = offsetof(ASS, styles),
98 .offset_count = offsetof(ASS, styles_count),
f6fa7814
DM		 99 .fields = {{"Name", ASS_STR, offsetof(ASSStyle, name) },
100 {"Fontname", ASS_STR, offsetof(ASSStyle, font_name) },
101 {"Fontsize", ASS_INT, offsetof(ASSStyle, font_size) },
102 {"PrimaryColour", ASS_COLOR, offsetof(ASSStyle, primary_color) },
103 {"SecondaryColour", ASS_COLOR, offsetof(ASSStyle, secondary_color)},
104 {"TertiaryColour", ASS_COLOR, offsetof(ASSStyle, outline_color) },
105 {"BackColour", ASS_COLOR, offsetof(ASSStyle, back_color) },
106 {"Bold", ASS_INT, offsetof(ASSStyle, bold) },
107 {"Italic", ASS_INT, offsetof(ASSStyle, italic) },
108 {"BorderStyle", ASS_INT, offsetof(ASSStyle, border_style) },
109 {"Outline", ASS_FLT, offsetof(ASSStyle, outline) },
110 {"Shadow", ASS_FLT, offsetof(ASSStyle, shadow) },
111 {"Alignment", ASS_ALGN, offsetof(ASSStyle, alignment) },
112 {"MarginL", ASS_INT, offsetof(ASSStyle, margin_l) },
113 {"MarginR", ASS_INT, offsetof(ASSStyle, margin_r) },
114 {"MarginV", ASS_INT, offsetof(ASSStyle, margin_v) },
115 {"AlphaLevel", ASS_INT, offsetof(ASSStyle, alpha_level) },
116 {"Encoding", ASS_INT, offsetof(ASSStyle, encoding) },
2ba45a60
DM		 117 {0},
118 }
119 },
120 { .section = "Events",
121 .format_header = "Format",
122 .fields_header = "Dialogue",
123 .size = sizeof(ASSDialog),
124 .offset = offsetof(ASS, dialogs),
125 .offset_count = offsetof(ASS, dialogs_count),
f6fa7814
DM		 126 .fields = {{"Layer", ASS_INT, offsetof(ASSDialog, layer) },
127 {"Start", ASS_TIMESTAMP, offsetof(ASSDialog, start) },
128 {"End", ASS_TIMESTAMP, offsetof(ASSDialog, end) },
129 {"Style", ASS_STR, offsetof(ASSDialog, style) },
130 {"Name", ASS_STR, offsetof(ASSDialog, name) },
131 {"MarginL", ASS_INT, offsetof(ASSDialog, margin_l)},
132 {"MarginR", ASS_INT, offsetof(ASSDialog, margin_r)},
133 {"MarginV", ASS_INT, offsetof(ASSDialog, margin_v)},
134 {"Effect", ASS_STR, offsetof(ASSDialog, effect) },
135 {"Text", ASS_STR, offsetof(ASSDialog, text) },
2ba45a60
DM		 136 {0},
137 }
138 },
139};
140
141
142typedef int (*ASSConvertFunc)(void *dest, const char *buf, int len);
143
144static int convert_str(void *dest, const char *buf, int len)
145{
146 char *str = av_malloc(len + 1);
147 if (str) {
148 memcpy(str, buf, len);
149 str[len] = 0;
150 if (*(void **)dest)
151 av_free(*(void **)dest);
152 *(char **)dest = str;
153 }
154 return !str;
155}
156static int convert_int(void *dest, const char *buf, int len)
157{
158 return sscanf(buf, "%d", (int *)dest) == 1;
159}
160static int convert_flt(void *dest, const char *buf, int len)
161{
162 return sscanf(buf, "%f", (float *)dest) == 1;
163}
164static int convert_color(void *dest, const char *buf, int len)
165{
166 return sscanf(buf, "&H%8x", (int *)dest) == 1 ||
167 sscanf(buf, "%d", (int *)dest) == 1;
168}
169static int convert_timestamp(void *dest, const char *buf, int len)
170{
171 int c, h, m, s, cs;
172 if ((c = sscanf(buf, "%d:%02d:%02d.%02d", &h, &m, &s, &cs)) == 4)
173 *(int *)dest = 360000*h + 6000*m + 100*s + cs;
174 return c == 4;
175}
176static int convert_alignment(void *dest, const char *buf, int len)
177{
178 int a;
179 if (sscanf(buf, "%d", &a) == 1) {
180 /* convert V4 Style alignment to V4+ Style */
181 *(int *)dest = a + ((a&4) >> 1) - 5*!!(a&8);
182 return 1;
183 }
184 return 0;
185}
186
187static const ASSConvertFunc convert_func[] = {
188 [ASS_STR] = convert_str,
189 [ASS_INT] = convert_int,
190 [ASS_FLT] = convert_flt,
191 [ASS_COLOR] = convert_color,
192 [ASS_TIMESTAMP] = convert_timestamp,
193 [ASS_ALGN] = convert_alignment,
194};
195
196
197struct ASSSplitContext {
198 ASS ass;
199 int current_section;
200 int field_number[FF_ARRAY_ELEMS(ass_sections)];
201 int *field_order[FF_ARRAY_ELEMS(ass_sections)];
202};
203
204
205static uint8_t *realloc_section_array(ASSSplitContext *ctx)
206{
207 const ASSSection *section = &ass_sections[ctx->current_section];
208 int *count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
209 void **section_ptr = (void **)((uint8_t *)&ctx->ass + section->offset);
210 uint8_t *tmp = av_realloc(*section_ptr, (*count+1)*section->size);
211 if (!tmp)
212 return NULL;
213 *section_ptr = tmp;
214 tmp += *count * section->size;
215 memset(tmp, 0, section->size);
216 (*count)++;
217 return tmp;
218}
219
220static inline int is_eol(char buf)
221{
222 return buf == '\r' || buf == '\n' || buf == 0;
223}
224
225static inline const char *skip_space(const char *buf)
226{
227 while (*buf == ' ')
228 buf++;
229 return buf;
230}
231
f6fa7814
DM		 232static int *get_default_field_orders(const ASSSection *section)
233{
234 int i;
235 int *order = av_malloc(FF_ARRAY_ELEMS(section->fields) * sizeof(*order));
236
237 if (!order)
238 return NULL;
239 for (i = 0; section->fields[i].name; i++)
240 order[i] = i;
241 while (i < FF_ARRAY_ELEMS(section->fields))
242 order[i] = -1;
243 return order;
244}
245
2ba45a60
DM		 246static const char *ass_split_section(ASSSplitContext *ctx, const char *buf)
247{
248 const ASSSection *section = &ass_sections[ctx->current_section];
249 int *number = &ctx->field_number[ctx->current_section];
250 int *order = ctx->field_order[ctx->current_section];
251 int *tmp, i, len;
252
253 while (buf && *buf) {
254 if (buf[0] == '[') {
255 ctx->current_section = -1;
256 break;
257 }
258 if (buf[0] == ';' || (buf[0] == '!' && buf[1] == ':')) {
259 /* skip comments */
260 } else if (section->format_header && !order) {
261 len = strlen(section->format_header);
262 if (strncmp(buf, section->format_header, len) || buf[len] != ':')
f6fa7814 263 goto next_line;
2ba45a60
DM		 264 buf += len + 1;
265 while (!is_eol(*buf)) {
266 buf = skip_space(buf);
267 len = strcspn(buf, ", \r\n");
268 if (!(tmp = av_realloc(order, (*number + 1) * sizeof(*order))))
269 return NULL;
270 order = tmp;
271 order[*number] = -1;
272 for (i=0; section->fields[i].name; i++)
273 if (!strncmp(buf, section->fields[i].name, len)) {
274 order[*number] = i;
275 break;
276 }
277 (*number)++;
278 buf = skip_space(buf + len + (buf[len] == ','));
279 }
280 ctx->field_order[ctx->current_section] = order;
281 } else if (section->fields_header) {
282 len = strlen(section->fields_header);
283 if (!strncmp(buf, section->fields_header, len) && buf[len] == ':') {
284 uint8_t *ptr, *struct_ptr = realloc_section_array(ctx);
285 if (!struct_ptr) return NULL;
f6fa7814
DM		 286
287 /* No format header line found so far, assume default */
288 if (!order) {
289 order = get_default_field_orders(section);
290 if (!order)
291 return NULL;
292 ctx->field_order[ctx->current_section] = order;
293 }
294
2ba45a60
DM		 295 buf += len + 1;
296 for (i=0; !is_eol(*buf) && i < *number; i++) {
297 int last = i == *number - 1;
298 buf = skip_space(buf);
299 len = strcspn(buf, last ? "\r\n" : ",\r\n");
300 if (order[i] >= 0) {
301 ASSFieldType type = section->fields[order[i]].type;
302 ptr = struct_ptr + section->fields[order[i]].offset;
303 convert_func[type](ptr, buf, len);
304 }
305 buf += len;
306 if (!last && *buf) buf++;
307 buf = skip_space(buf);
308 }
309 }
310 } else {
311 len = strcspn(buf, ":\r\n");
312 if (buf[len] == ':') {
313 for (i=0; section->fields[i].name; i++)
314 if (!strncmp(buf, section->fields[i].name, len)) {
315 ASSFieldType type = section->fields[i].type;
316 uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
317 ptr += section->fields[i].offset;
318 buf = skip_space(buf + len + 1);
319 convert_func[type](ptr, buf, strcspn(buf, "\r\n"));
320 break;
321 }
322 }
323 }
f6fa7814 324next_line:
2ba45a60
DM		 325 buf += strcspn(buf, "\n");
326 buf += !!*buf;
327 }
328 return buf;
329}
330
331static int ass_split(ASSSplitContext *ctx, const char *buf)
332{
333 char c, section[16];
334 int i;
335
336 if (ctx->current_section >= 0)
337 buf = ass_split_section(ctx, buf);
338
339 while (buf && *buf) {
340 if (sscanf(buf, "[%15[0-9A-Za-z+ ]]%c", section, &c) == 2) {
341 buf += strcspn(buf, "\n");
342 buf += !!*buf;
343 for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
344 if (!strcmp(section, ass_sections[i].section)) {
345 ctx->current_section = i;
346 buf = ass_split_section(ctx, buf);
347 }
348 } else {
349 buf += strcspn(buf, "\n");
350 buf += !!*buf;
351 }
352 }
353 return buf ? 0 : AVERROR_INVALIDDATA;
354}
355
356ASSSplitContext *ff_ass_split(const char *buf)
357{
358 ASSSplitContext *ctx = av_mallocz(sizeof(*ctx));
359 ctx->current_section = -1;
360 if (ass_split(ctx, buf) < 0) {
361 ff_ass_split_free(ctx);
362 return NULL;
363 }
364 return ctx;
365}
366
367static void free_section(ASSSplitContext *ctx, const ASSSection *section)
368{
369 uint8_t *ptr = (uint8_t *)&ctx->ass + section->offset;
370 int i, j, *count, c = 1;
371
372 if (section->format_header) {
373 ptr = *(void **)ptr;
374 count = (int *)((uint8_t *)&ctx->ass + section->offset_count);
375 } else
376 count = &c;
377
378 if (ptr)
379 for (i=0; i<*count; i++, ptr += section->size)
380 for (j=0; section->fields[j].name; j++) {
381 const ASSFields *field = &section->fields[j];
382 if (field->type == ASS_STR)
383 av_freep(ptr + field->offset);
384 }
385 *count = 0;
386
387 if (section->format_header)
388 av_freep((uint8_t *)&ctx->ass + section->offset);
389}
390
391ASSDialog *ff_ass_split_dialog(ASSSplitContext *ctx, const char *buf,
392 int cache, int *number)
393{
394 ASSDialog *dialog = NULL;
395 int i, count;
396 if (!cache)
397 for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++)
398 if (!strcmp(ass_sections[i].section, "Events")) {
399 free_section(ctx, &ass_sections[i]);
400 break;
401 }
402 count = ctx->ass.dialogs_count;
403 if (ass_split(ctx, buf) == 0)
404 dialog = ctx->ass.dialogs + count;
405 if (number)
406 *number = ctx->ass.dialogs_count - count;
407 return dialog;
408}
409
410void ff_ass_split_free(ASSSplitContext *ctx)
411{
412 if (ctx) {
413 int i;
414 for (i=0; i<FF_ARRAY_ELEMS(ass_sections); i++) {
415 free_section(ctx, &ass_sections[i]);
416 av_freep(&(ctx->field_order[i]));
417 }
418 av_free(ctx);
419 }
420}
421
422
423int ff_ass_split_override_codes(const ASSCodesCallbacks *callbacks, void *priv,
424 const char *buf)
425{
426 const char *text = NULL;
427 char new_line[2];
428 int text_len = 0;
429
430 while (buf && *buf) {
431 if (text && callbacks->text &&
432 (sscanf(buf, "\\%1[nN]", new_line) == 1 ||
433 !strncmp(buf, "{\\", 2))) {
434 callbacks->text(priv, text, text_len);
435 text = NULL;
436 }
437 if (sscanf(buf, "\\%1[nN]", new_line) == 1) {
438 if (callbacks->new_line)
439 callbacks->new_line(priv, new_line[0] == 'N');
440 buf += 2;
441 } else if (!strncmp(buf, "{\\", 2)) {
442 buf++;
443 while (*buf == '\\') {
444 char style[2], c[2], sep[2], c_num[2] = "0", tmp[128] = {0};
445 unsigned int color = 0xFFFFFFFF;
446 int len, size = -1, an = -1, alpha = -1;
447 int x1, y1, x2, y2, t1 = -1, t2 = -1;
448 if (sscanf(buf, "\\%1[bisu]%1[01\\}]%n", style, c, &len) > 1) {
449 int close = c[0] == '0' ? 1 : c[0] == '1' ? 0 : -1;
450 len += close != -1;
451 if (callbacks->style)
452 callbacks->style(priv, style[0], close);
453 } else if (sscanf(buf, "\\c%1[\\}]%n", sep, &len) > 0 ||
454 sscanf(buf, "\\c&H%X&%1[\\}]%n", &color, sep, &len) > 1 ||
455 sscanf(buf, "\\%1[1234]c%1[\\}]%n", c_num, sep, &len) > 1 ||
456 sscanf(buf, "\\%1[1234]c&H%X&%1[\\}]%n", c_num, &color, sep, &len) > 2) {
457 if (callbacks->color)
458 callbacks->color(priv, color, c_num[0] - '0');
459 } else if (sscanf(buf, "\\alpha%1[\\}]%n", sep, &len) > 0 ||
460 sscanf(buf, "\\alpha&H%2X&%1[\\}]%n", &alpha, sep, &len) > 1 ||
461 sscanf(buf, "\\%1[1234]a%1[\\}]%n", c_num, sep, &len) > 1 ||
462 sscanf(buf, "\\%1[1234]a&H%2X&%1[\\}]%n", c_num, &alpha, sep, &len) > 2) {
463 if (callbacks->alpha)
464 callbacks->alpha(priv, alpha, c_num[0] - '0');
465 } else if (sscanf(buf, "\\fn%1[\\}]%n", sep, &len) > 0 ||
466 sscanf(buf, "\\fn%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) {
467 if (callbacks->font_name)
468 callbacks->font_name(priv, tmp[0] ? tmp : NULL);
469 } else if (sscanf(buf, "\\fs%1[\\}]%n", sep, &len) > 0 ||
470 sscanf(buf, "\\fs%u%1[\\}]%n", &size, sep, &len) > 1) {
471 if (callbacks->font_size)
472 callbacks->font_size(priv, size);
473 } else if (sscanf(buf, "\\a%1[\\}]%n", sep, &len) > 0 ||
474 sscanf(buf, "\\a%2u%1[\\}]%n", &an, sep, &len) > 1 ||
475 sscanf(buf, "\\an%1[\\}]%n", sep, &len) > 0 ||
476 sscanf(buf, "\\an%1u%1[\\}]%n", &an, sep, &len) > 1) {
477 if (an != -1 && buf[2] != 'n')
478 an = (an&3) + (an&4 ? 6 : an&8 ? 3 : 0);
479 if (callbacks->alignment)
480 callbacks->alignment(priv, an);
481 } else if (sscanf(buf, "\\r%1[\\}]%n", sep, &len) > 0 ||
482 sscanf(buf, "\\r%127[^\\}]%1[\\}]%n", tmp, sep, &len) > 1) {
483 if (callbacks->cancel_overrides)
484 callbacks->cancel_overrides(priv, tmp);
485 } else if (sscanf(buf, "\\move(%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, sep, &len) > 4 ||
486 sscanf(buf, "\\move(%d,%d,%d,%d,%d,%d)%1[\\}]%n", &x1, &y1, &x2, &y2, &t1, &t2, sep, &len) > 6) {
487 if (callbacks->move)
488 callbacks->move(priv, x1, y1, x2, y2, t1, t2);
489 } else if (sscanf(buf, "\\pos(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) {
490 if (callbacks->move)
491 callbacks->move(priv, x1, y1, x1, y1, -1, -1);
492 } else if (sscanf(buf, "\\org(%d,%d)%1[\\}]%n", &x1, &y1, sep, &len) > 2) {
493 if (callbacks->origin)
494 callbacks->origin(priv, x1, y1);
495 } else {
496 len = strcspn(buf+1, "\\}") + 2; /* skip unknown code */
497 }
498 buf += len - 1;
499 }
500 if (*buf++ != '}')
501 return AVERROR_INVALIDDATA;
502 } else {
503 if (!text) {
504 text = buf;
505 text_len = 1;
506 } else
507 text_len++;
508 buf++;
509 }
510 }
511 if (text && callbacks->text)
512 callbacks->text(priv, text, text_len);
513 if (callbacks->end)
514 callbacks->end(priv);
515 return 0;
516}
517
518ASSStyle *ff_ass_style_get(ASSSplitContext *ctx, const char *style)
519{
520 ASS *ass = &ctx->ass;
521 int i;
522
523 if (!style || !*style)
524 style = "Default";
525 for (i=0; i<ass->styles_count; i++)
526 if (!strcmp(ass->styles[i].name, style))
527 return ass->styles + i;
528 return NULL;
529}
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