FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/movtextenc.c
Date: 2022-01-28 07:56:06
Exec Total Coverage
Lines: 202 332 60.8%
Branches: 62 158 39.2%

Line Branch Exec Source
1 /*
2 * 3GPP TS 26.245 Timed Text encoder
3 * Copyright (c) 2012 Philip Langdale <philipl@overt.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 <stdarg.h>
23 #include "avcodec.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/common.h"
29 #include "ass_split.h"
30 #include "ass.h"
31 #include "bytestream.h"
32 #include "internal.h"
33
34 #define STYLE_FLAG_BOLD (1<<0)
35 #define STYLE_FLAG_ITALIC (1<<1)
36 #define STYLE_FLAG_UNDERLINE (1<<2)
37 #define STYLE_RECORD_SIZE 12
38 #define SIZE_ADD 10
39
40 #define STYL_BOX (1<<0)
41 #define HLIT_BOX (1<<1)
42 #define HCLR_BOX (1<<2)
43
44 #define DEFAULT_STYLE_FONT_ID 0x01
45 #define DEFAULT_STYLE_FONTSIZE 0x12
46 #define DEFAULT_STYLE_COLOR 0xffffffff
47 #define DEFAULT_STYLE_FLAG 0x00
48
49 #define BGR_TO_RGB(c) (((c) & 0xff) << 16 | ((c) & 0xff00) | (((uint32_t)(c) >> 16) & 0xff))
50 #define FONTSIZE_SCALE(s,fs) ((fs) * (s)->font_scale_factor + 0.5)
51 #define av_bprint_append_any(buf, data, size) av_bprint_append_data(buf, ((const char*)data), size)
52
53 typedef struct {
54 uint16_t style_start;
55 uint16_t style_end;
56 uint8_t style_flag;
57 uint16_t style_fontID;
58 uint8_t style_fontsize;
59 uint32_t style_color;
60 } StyleBox;
61
62 typedef struct {
63 uint16_t start;
64 uint16_t end;
65 } HighlightBox;
66
67 typedef struct {
68 uint32_t color;
69 } HilightcolorBox;
70
71 typedef struct {
72 AVClass *class;
73 AVCodecContext *avctx;
74
75 ASSSplitContext *ass_ctx;
76 ASSStyle *ass_dialog_style;
77 StyleBox *style_attributes;
78 unsigned count;
79 unsigned style_attributes_bytes_allocated;
80 StyleBox style_attributes_temp;
81 AVBPrint buffer;
82 HighlightBox hlit;
83 HilightcolorBox hclr;
84 uint8_t box_flags;
85 StyleBox d;
86 uint16_t text_pos;
87 char **fonts;
88 int font_count;
89 double font_scale_factor;
90 int frame_height;
91 } MovTextContext;
92
93 typedef struct {
94 void (*encode)(MovTextContext *s);
95 } Box;
96
97 3 static void mov_text_cleanup(MovTextContext *s)
98 {
99 3 s->count = 0;
100 3 s->style_attributes_temp = s->d;
101 3 }
102
103 3 static void encode_styl(MovTextContext *s)
104 {
105
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3 if ((s->box_flags & STYL_BOX) && s->count) {
106 uint8_t buf[12], *p = buf;
107
108 bytestream_put_be32(&p, s->count * STYLE_RECORD_SIZE + SIZE_ADD);
109 bytestream_put_be32(&p, MKBETAG('s','t','y','l'));
110 bytestream_put_be16(&p, s->count);
111 /*The above three attributes are hard coded for now
112 but will come from ASS style in the future*/
113 av_bprint_append_any(&s->buffer, buf, 10);
114 for (unsigned j = 0; j < s->count; j++) {
115 const StyleBox *style = &s->style_attributes[j];
116
117 p = buf;
118 bytestream_put_be16(&p, style->style_start);
119 bytestream_put_be16(&p, style->style_end);
120 bytestream_put_be16(&p, style->style_fontID);
121 bytestream_put_byte(&p, style->style_flag);
122 bytestream_put_byte(&p, style->style_fontsize);
123 bytestream_put_be32(&p, style->style_color);
124
125 av_bprint_append_any(&s->buffer, buf, 12);
126 }
127 }
128 3 mov_text_cleanup(s);
129 3 }
130
131 3 static void encode_hlit(MovTextContext *s)
132 {
133
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3 if (s->box_flags & HLIT_BOX) {
134 uint8_t buf[12], *p = buf;
135
136 bytestream_put_be32(&p, 12);
137 bytestream_put_be32(&p, MKBETAG('h','l','i','t'));
138 bytestream_put_be16(&p, s->hlit.start);
139 bytestream_put_be16(&p, s->hlit.end);
140
141 av_bprint_append_any(&s->buffer, buf, 12);
142 }
143 3 }
144
145 3 static void encode_hclr(MovTextContext *s)
146 {
147
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3 if (s->box_flags & HCLR_BOX) {
148 uint8_t buf[12], *p = buf;
149
150 bytestream_put_be32(&p, 12);
151 bytestream_put_be32(&p, MKBETAG('h','c','l','r'));
152 bytestream_put_be32(&p, s->hclr.color);
153
154 av_bprint_append_any(&s->buffer, buf, 12);
155 }
156 3 }
157
158 static const Box box_types[] = {
159 { encode_styl },
160 { encode_hlit },
161 { encode_hclr },
162 };
163
164 const static size_t box_count = FF_ARRAY_ELEMS(box_types);
165
166 1 static int mov_text_encode_close(AVCodecContext *avctx)
167 {
168 1 MovTextContext *s = avctx->priv_data;
169
170 1 ff_ass_split_free(s->ass_ctx);
171 1 av_freep(&s->style_attributes);
172 1 av_freep(&s->fonts);
173 1 av_bprint_finalize(&s->buffer, NULL);
174 1 return 0;
175 }
176
177 1 static int encode_sample_description(AVCodecContext *avctx)
178 {
179 ASS *ass;
180 ASSStyle *style;
181 int i, j;
182 1 uint32_t back_color = 0;
183 1 int font_names_total_len = 0;
184 1 MovTextContext *s = avctx->priv_data;
185 1 uint8_t buf[30], *p = buf;
186
187 // 0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags
188 // 0x01, // int8_t horizontal-justification
189 // 0xFF, // int8_t vertical-justification
190 // 0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
191 // BoxRecord {
192 // 0x00, 0x00, // int16_t top
193 // 0x00, 0x00, // int16_t left
194 // 0x00, 0x00, // int16_t bottom
195 // 0x00, 0x00, // int16_t right
196 // };
197 // StyleRecord {
198 // 0x00, 0x00, // uint16_t startChar
199 // 0x00, 0x00, // uint16_t endChar
200 // 0x00, 0x01, // uint16_t font-ID
201 // 0x00, // uint8_t face-style-flags
202 // 0x12, // uint8_t font-size
203 // 0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
204 // };
205 // FontTableBox {
206 // 0x00, 0x00, 0x00, 0x12, // uint32_t size
207 // 'f', 't', 'a', 'b', // uint8_t name[4]
208 // 0x00, 0x01, // uint16_t entry-count
209 // FontRecord {
210 // 0x00, 0x01, // uint16_t font-ID
211 // 0x05, // uint8_t font-name-length
212 // 'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
213 // };
214 // };
215
216 // Populate sample description from ASS header
217 1 ass = (ASS*)s->ass_ctx;
218 // Compute font scaling factor based on (optionally) provided
219 // output video height and ASS script play_res_y
220
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1 if (s->frame_height && ass->script_info.play_res_y)
221 s->font_scale_factor = (double)s->frame_height / ass->script_info.play_res_y;
222 else
223 1 s->font_scale_factor = 1;
224
225 1 style = ff_ass_style_get(s->ass_ctx, "Default");
226
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1 if (!style && ass->styles_count) {
227 style = &ass->styles[0];
228 }
229 1 s->d.style_fontID = DEFAULT_STYLE_FONT_ID;
230 1 s->d.style_fontsize = DEFAULT_STYLE_FONTSIZE;
231 1 s->d.style_color = DEFAULT_STYLE_COLOR;
232 1 s->d.style_flag = DEFAULT_STYLE_FLAG;
233
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1 if (style) {
234 1 s->d.style_fontsize = FONTSIZE_SCALE(s, style->font_size);
235 1 s->d.style_color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8 |
236 1 255 - ((uint32_t)style->primary_color >> 24);
237 1 s->d.style_flag = (!!style->bold * STYLE_FLAG_BOLD) |
238
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2 (!!style->italic * STYLE_FLAG_ITALIC) |
239
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1 (!!style->underline * STYLE_FLAG_UNDERLINE);
240 1 back_color = (BGR_TO_RGB(style->back_color & 0xffffff) << 8) |
241 1 (255 - ((uint32_t)style->back_color >> 24));
242 }
243
244 1 bytestream_put_be32(&p, 0); // displayFlags
245 1 bytestream_put_be16(&p, 0x01FF); // horizontal/vertical justification (2x int8_t)
246 1 bytestream_put_be32(&p, back_color);
247 1 bytestream_put_be64(&p, 0); // BoxRecord - 4xint16_t: top, left, bottom, right
248 // StyleRecord {
249 1 bytestream_put_be16(&p, s->d.style_start);
250 1 bytestream_put_be16(&p, s->d.style_end);
251 1 bytestream_put_be16(&p, s->d.style_fontID);
252 1 bytestream_put_byte(&p, s->d.style_flag);
253 1 bytestream_put_byte(&p, s->d.style_fontsize);
254 1 bytestream_put_be32(&p, s->d.style_color);
255 // };
256 1 av_bprint_append_any(&s->buffer, buf, 30);
257
258 // Build font table
259 // We can't build a complete font table since that would require
260 // scanning all dialogs first. But we can at least fill in what
261 // is avaiable in the ASS header
262
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1 if (style && ass->styles_count) {
263 // Find unique font names
264
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1 if (style->font_name) {
265 1 av_dynarray_add(&s->fonts, &s->font_count, style->font_name);
266 1 font_names_total_len += strlen(style->font_name);
267 }
268
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2 for (i = 0; i < ass->styles_count; i++) {
269 1 int found = 0;
270
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1 if (!ass->styles[i].font_name)
271 continue;
272
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1 for (j = 0; j < s->font_count; j++) {
273
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1 if (!strcmp(s->fonts[j], ass->styles[i].font_name)) {
274 1 found = 1;
275 1 break;
276 }
277 }
278
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1 if (!found) {
279 av_dynarray_add(&s->fonts, &s->font_count,
280 ass->styles[i].font_name);
281 font_names_total_len += strlen(ass->styles[i].font_name);
282 }
283 }
284 } else
285 av_dynarray_add(&s->fonts, &s->font_count, (char*)"Serif");
286
287 // FontTableBox {
288 1 p = buf;
289 1 bytestream_put_be32(&p, SIZE_ADD + 3 * s->font_count + font_names_total_len); // Size
290 1 bytestream_put_be32(&p, MKBETAG('f','t','a','b'));
291 1 bytestream_put_be16(&p, s->font_count);
292
293 1 av_bprint_append_any(&s->buffer, buf, 10);
294 // FontRecord {
295
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2 for (i = 0; i < s->font_count; i++) {
296 1 size_t len = strlen(s->fonts[i]);
297
298 1 p = buf;
299 1 bytestream_put_be16(&p, i + 1); //fontID
300 1 bytestream_put_byte(&p, len);
301
302 1 av_bprint_append_any(&s->buffer, buf, 3);
303 1 av_bprint_append_any(&s->buffer, s->fonts[i], len);
304 }
305 // };
306 // };
307
308
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1 if (!av_bprint_is_complete(&s->buffer)) {
309 return AVERROR(ENOMEM);
310 }
311
312 1 avctx->extradata_size = s->buffer.len;
313 1 avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
314
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1 if (!avctx->extradata) {
315 return AVERROR(ENOMEM);
316 }
317
318 1 memcpy(avctx->extradata, s->buffer.str, avctx->extradata_size);
319 1 av_bprint_clear(&s->buffer);
320
321 1 return 0;
322 }
323
324 1 static av_cold int mov_text_encode_init(AVCodecContext *avctx)
325 {
326 int ret;
327 1 MovTextContext *s = avctx->priv_data;
328 1 s->avctx = avctx;
329
330 1 av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
331
332 1 s->ass_ctx = ff_ass_split(avctx->subtitle_header);
333
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1 if (!s->ass_ctx)
334 return AVERROR_INVALIDDATA;
335 1 ret = encode_sample_description(avctx);
336
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1 if (ret < 0)
337 return ret;
338
339 1 return 0;
340 }
341
342 // Start a new style box if needed
343 7 static int mov_text_style_start(MovTextContext *s)
344 {
345 // there's an existing style entry
346
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7 if (s->style_attributes_temp.style_start == s->text_pos)
347 // Still at same text pos, use same entry
348 4 return 1;
349
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3 if (s->style_attributes_temp.style_flag != s->d.style_flag ||
350
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3 s->style_attributes_temp.style_color != s->d.style_color ||
351
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3 s->style_attributes_temp.style_fontID != s->d.style_fontID ||
352
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3 s->style_attributes_temp.style_fontsize != s->d.style_fontsize) {
353 StyleBox *tmp;
354
355 // last style != defaults, end the style entry and start a new one
356 if (s->count + 1 > FFMIN(SIZE_MAX / sizeof(*s->style_attributes), UINT16_MAX) ||
357 !(tmp = av_fast_realloc(s->style_attributes,
358 &s->style_attributes_bytes_allocated,
359 (s->count + 1) * sizeof(*s->style_attributes)))) {
360 mov_text_cleanup(s);
361 av_bprint_clear(&s->buffer);
362 s->box_flags &= ~STYL_BOX;
363 return 0;
364 }
365 s->style_attributes = tmp;
366 s->style_attributes_temp.style_end = s->text_pos;
367 s->style_attributes[s->count++] = s->style_attributes_temp;
368 s->box_flags |= STYL_BOX;
369 s->style_attributes_temp = s->d;
370 s->style_attributes_temp.style_start = s->text_pos;
371 } else { // style entry matches defaults, drop entry
372 3 s->style_attributes_temp = s->d;
373 3 s->style_attributes_temp.style_start = s->text_pos;
374 }
375 3 return 1;
376 }
377
378 static uint8_t mov_text_style_to_flag(const char style)
379 {
380 uint8_t style_flag = 0;
381
382 switch (style){
383 case 'b':
384 style_flag = STYLE_FLAG_BOLD;
385 break;
386 case 'i':
387 style_flag = STYLE_FLAG_ITALIC;
388 break;
389 case 'u':
390 style_flag = STYLE_FLAG_UNDERLINE;
391 break;
392 }
393 return style_flag;
394 }
395
396 3 static void mov_text_style_set(MovTextContext *s, uint8_t style_flags)
397 {
398
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3 if (!((s->style_attributes_temp.style_flag & style_flags) ^ style_flags)) {
399 // setting flags that that are already set
400 3 return;
401 }
402 if (mov_text_style_start(s))
403 s->style_attributes_temp.style_flag |= style_flags;
404 }
405
406 static void mov_text_style_cb(void *priv, const char style, int close)
407 {
408 MovTextContext *s = priv;
409 uint8_t style_flag = mov_text_style_to_flag(style);
410
411 if (!!(s->style_attributes_temp.style_flag & style_flag) != close) {
412 // setting flag that is already set
413 return;
414 }
415 if (mov_text_style_start(s)) {
416 if (!close)
417 s->style_attributes_temp.style_flag |= style_flag;
418 else
419 s->style_attributes_temp.style_flag &= ~style_flag;
420 }
421 }
422
423 3 static void mov_text_color_set(MovTextContext *s, uint32_t color)
424 {
425
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3 if ((s->style_attributes_temp.style_color & 0xffffff00) == color) {
426 // color hasn't changed
427 2 return;
428 }
429
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1 if (mov_text_style_start(s))
430 1 s->style_attributes_temp.style_color = (color & 0xffffff00) |
431 1 (s->style_attributes_temp.style_color & 0xff);
432 }
433
434 static void mov_text_color_cb(void *priv, unsigned int color, unsigned int color_id)
435 {
436 MovTextContext *s = priv;
437
438 color = BGR_TO_RGB(color) << 8;
439 if (color_id == 1) { //primary color changes
440 mov_text_color_set(s, color);
441 } else if (color_id == 2) { //secondary color changes
442 if (!(s->box_flags & HCLR_BOX))
443 // Highlight alpha not set yet, use current primary alpha
444 s->hclr.color = s->style_attributes_temp.style_color;
445 if (!(s->box_flags & HLIT_BOX) || s->hlit.start == s->text_pos) {
446 s->box_flags |= HCLR_BOX;
447 s->box_flags |= HLIT_BOX;
448 s->hlit.start = s->text_pos;
449 s->hclr.color = color | (s->hclr.color & 0xFF);
450 }
451 else //close tag
452 s->hlit.end = s->text_pos;
453 /* If there are more than one secondary color changes in ASS,
454 take start of first section and end of last section. Movtext
455 allows only one highlight box per sample.
456 */
457 }
458 // Movtext does not support changes to other color_id (outline, background)
459 }
460
461 3 static void mov_text_alpha_set(MovTextContext *s, uint8_t alpha)
462 {
463
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3 if ((s->style_attributes_temp.style_color & 0xff) == alpha) {
464 // color hasn't changed
465 2 return;
466 }
467
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1 if (mov_text_style_start(s))
468 1 s->style_attributes_temp.style_color =
469 1 (s->style_attributes_temp.style_color & 0xffffff00) | alpha;
470 }
471
472 static void mov_text_alpha_cb(void *priv, int alpha, int alpha_id)
473 {
474 MovTextContext *s = priv;
475
476 alpha = 255 - alpha;
477 if (alpha_id == 1) // primary alpha changes
478 mov_text_alpha_set(s, alpha);
479 else if (alpha_id == 2) { //secondary alpha changes
480 if (!(s->box_flags & HCLR_BOX))
481 // Highlight color not set yet, use current primary color
482 s->hclr.color = s->style_attributes_temp.style_color;
483 if (!(s->box_flags & HLIT_BOX) || s->hlit.start == s->text_pos) {
484 s->box_flags |= HCLR_BOX;
485 s->box_flags |= HLIT_BOX;
486 s->hlit.start = s->text_pos;
487 s->hclr.color = (s->hclr.color & 0xffffff00) | alpha;
488 }
489 else //close tag
490 s->hlit.end = s->text_pos;
491 }
492 // Movtext does not support changes to other alpha_id (outline, background)
493 }
494
495 3 static uint16_t find_font_id(MovTextContext *s, const char *name)
496 {
497
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3 if (!name)
498 return 1;
499
500
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3 for (int i = 0; i < s->font_count; i++) {
501
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3 if (!strcmp(name, s->fonts[i]))
502 3 return i + 1;
503 }
504 return 1;
505 }
506
507 3 static void mov_text_font_name_set(MovTextContext *s, const char *name)
508 {
509 3 int fontID = find_font_id(s, name);
510
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3 if (s->style_attributes_temp.style_fontID == fontID) {
511 // color hasn't changed
512 2 return;
513 }
514
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1 if (mov_text_style_start(s))
515 1 s->style_attributes_temp.style_fontID = fontID;
516 }
517
518 static void mov_text_font_name_cb(void *priv, const char *name)
519 {
520 mov_text_font_name_set((MovTextContext*)priv, name);
521 }
522
523 3 static void mov_text_font_size_set(MovTextContext *s, int size)
524 {
525 3 size = FONTSIZE_SCALE(s, size);
526
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3 if (s->style_attributes_temp.style_fontsize == size) {
527 // color hasn't changed
528 2 return;
529 }
530
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1 if (mov_text_style_start(s))
531 1 s->style_attributes_temp.style_fontsize = size;
532 }
533
534 static void mov_text_font_size_cb(void *priv, int size)
535 {
536 mov_text_font_size_set((MovTextContext*)priv, size);
537 }
538
539 3 static void mov_text_end_cb(void *priv)
540 {
541 // End of text, close any open style record
542 3 mov_text_style_start((MovTextContext*)priv);
543 3 }
544
545 3 static void mov_text_ass_style_set(MovTextContext *s, ASSStyle *style)
546 {
547 uint8_t style_flags, alpha;
548 uint32_t color;
549
550
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3 if (style) {
551 3 style_flags = (!!style->bold * STYLE_FLAG_BOLD) |
552
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6 (!!style->italic * STYLE_FLAG_ITALIC) |
553
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3 (!!style->underline * STYLE_FLAG_UNDERLINE);
554 3 mov_text_style_set(s, style_flags);
555 3 color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8;
556 3 mov_text_color_set(s, color);
557 3 alpha = 255 - ((uint32_t)style->primary_color >> 24);
558 3 mov_text_alpha_set(s, alpha);
559 3 mov_text_font_size_set(s, style->font_size);
560 3 mov_text_font_name_set(s, style->font_name);
561 } else {
562 // End current style record, go back to defaults
563 mov_text_style_start(s);
564 }
565 3 }
566
567 3 static void mov_text_dialog(MovTextContext *s, ASSDialog *dialog)
568 {
569 3 ASSStyle *style = ff_ass_style_get(s->ass_ctx, dialog->style);
570
571 3 s->ass_dialog_style = style;
572 3 mov_text_ass_style_set(s, style);
573 3 }
574
575 static void mov_text_cancel_overrides_cb(void *priv, const char *style_name)
576 {
577 MovTextContext *s = priv;
578 ASSStyle *style;
579
580 if (!style_name || !*style_name)
581 style = s->ass_dialog_style;
582 else
583 style= ff_ass_style_get(s->ass_ctx, style_name);
584
585 mov_text_ass_style_set(s, style);
586 }
587
588 5 static unsigned utf8_strlen(const char *text, int len)
589 {
590 5 unsigned i = 0, ret = 0;
591
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48 while (i < len) {
592 43 char c = text[i];
593
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43 if ((c & 0x80) == 0)
594 43 i += 1;
595 else if ((c & 0xE0) == 0xC0)
596 i += 2;
597 else if ((c & 0xF0) == 0xE0)
598 i += 3;
599 else if ((c & 0xF8) == 0xF0)
600 i += 4;
601 else
602 return 0;
603 43 ret++;
604 }
605 5 return ret;
606 }
607
608 5 static void mov_text_text_cb(void *priv, const char *text, int len)
609 {
610 5 unsigned utf8_len = utf8_strlen(text, len);
611 5 MovTextContext *s = priv;
612 5 av_bprint_append_data(&s->buffer, text, len);
613 // If it's not utf-8, just use the byte length
614
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5 s->text_pos += utf8_len ? utf8_len : len;
615 5 }
616
617 2 static void mov_text_new_line_cb(void *priv, int forced)
618 {
619 2 MovTextContext *s = priv;
620 2 s->text_pos += 1;
621 2 av_bprint_chars(&s->buffer, '\n', 1);
622 2 }
623
624 static const ASSCodesCallbacks mov_text_callbacks = {
625 .text = mov_text_text_cb,
626 .new_line = mov_text_new_line_cb,
627 .style = mov_text_style_cb,
628 .color = mov_text_color_cb,
629 .alpha = mov_text_alpha_cb,
630 .font_name = mov_text_font_name_cb,
631 .font_size = mov_text_font_size_cb,
632 .cancel_overrides = mov_text_cancel_overrides_cb,
633 .end = mov_text_end_cb,
634 };
635
636 3 static int mov_text_encode_frame(AVCodecContext *avctx, unsigned char *buf,
637 int bufsize, const AVSubtitle *sub)
638 {
639 3 MovTextContext *s = avctx->priv_data;
640 ASSDialog *dialog;
641 int i, length;
642
643 3 s->text_pos = 0;
644 3 s->count = 0;
645 3 s->box_flags = 0;
646 3 av_bprint_clear(&s->buffer);
647
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6 for (i = 0; i < sub->num_rects; i++) {
648 3 const char *ass = sub->rects[i]->ass;
649
650
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3 if (sub->rects[i]->type != SUBTITLE_ASS) {
651 av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
652 return AVERROR(EINVAL);
653 }
654
655 3 dialog = ff_ass_split_dialog(s->ass_ctx, ass);
656
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3 if (!dialog)
657 return AVERROR(ENOMEM);
658 3 mov_text_dialog(s, dialog);
659 3 ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
660 3 ff_ass_free_dialog(&dialog);
661 }
662
663
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3 if (s->buffer.len > UINT16_MAX)
664 return AVERROR(ERANGE);
665 3 AV_WB16(buf, s->buffer.len);
666 3 buf += 2;
667
668
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12 for (size_t j = 0; j < box_count; j++)
669 9 box_types[j].encode(s);
670
671
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3 if (!av_bprint_is_complete(&s->buffer))
672 return AVERROR(ENOMEM);
673
674
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3 if (!s->buffer.len)
675 return 0;
676
677
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3 if (s->buffer.len > bufsize - 3) {
678 av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
679 return AVERROR_BUFFER_TOO_SMALL;
680 }
681
682 3 memcpy(buf, s->buffer.str, s->buffer.len);
683 3 length = s->buffer.len + 2;
684
685 3 return length;
686 }
687
688 #define OFFSET(x) offsetof(MovTextContext, x)
689 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
690 static const AVOption options[] = {
691 { "height", "Frame height, usually video height", OFFSET(frame_height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
692 { NULL },
693 };
694
695 static const AVClass mov_text_encoder_class = {
696 .class_name = "MOV text enoder",
697 .item_name = av_default_item_name,
698 .option = options,
699 .version = LIBAVUTIL_VERSION_INT,
700 };
701
702 const AVCodec ff_movtext_encoder = {
703 .name = "mov_text",
704 .long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"),
705 .type = AVMEDIA_TYPE_SUBTITLE,
706 .id = AV_CODEC_ID_MOV_TEXT,
707 .priv_data_size = sizeof(MovTextContext),
708 .priv_class = &mov_text_encoder_class,
709 .init = mov_text_encode_init,
710 .encode_sub = mov_text_encode_frame,
711 .close = mov_text_encode_close,
712 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
713 };
714