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Imported Debian version 2.4.3~trusty1
[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;
47 ASSFields fields[10];
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),
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
113typedef int (*ASSConvertFunc)(void *dest, const char *buf, int len);
114
115static 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}
127static int convert_int(void *dest, const char *buf, int len)
128{
129 return sscanf(buf, "%d", (int *)dest) == 1;
130}
131static int convert_flt(void *dest, const char *buf, int len)
132{
133 return sscanf(buf, "%f", (float *)dest) == 1;
134}
135static 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}
140static 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}
147static 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
158static 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
168struct 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
176static 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
191static inline int is_eol(char buf)
192{
193 return buf == '\r' || buf == '\n' || buf == 0;
194}
195
196static inline const char *skip_space(const char *buf)
197{
198 while (*buf == ' ')
199 buf++;
200 return buf;
201}
202
203static 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
278static 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
303ASSSplitContext *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
314static 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 = &section->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
338ASSDialog *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
357void 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
370int 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
465ASSStyle *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}
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