FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/movtextenc.c
Date: 2026-09-27 18:38:33
Exec Total Coverage
Lines: 203 340 59.7%
Functions: 21 28 75.0%
Branches: 66 158 41.8%
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/attributes.h"
25 #include "libavutil/opt.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 "codec_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 3 static av_cold int mov_text_encode_close(AVCodecContext *avctx)
167 {
168 3 MovTextContext *s = avctx->priv_data;
169
170 3 ff_ass_split_free(s->ass_ctx);
171 3 av_freep(&s->style_attributes);
172 3 av_freep(&s->fonts);
173 3 return 0;
174 }
175
176 3 static int encode_sample_description(AVCodecContext *avctx)
177 {
178 ASS *ass;
179 ASSStyle *style;
180 int i, j;
181 3 uint32_t back_color = 0;
182 3 int font_names_total_len = 0;
183 3 MovTextContext *s = avctx->priv_data;
184 3 uint8_t buf[30], *p = buf;
185 int ret;
186
187 3 av_bprint_init(&s->buffer, 0, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE + 1);
188
189 // 0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags
190 // 0x01, // int8_t horizontal-justification
191 // 0xFF, // int8_t vertical-justification
192 // 0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4]
193 // BoxRecord {
194 // 0x00, 0x00, // int16_t top
195 // 0x00, 0x00, // int16_t left
196 // 0x00, 0x00, // int16_t bottom
197 // 0x00, 0x00, // int16_t right
198 // };
199 // StyleRecord {
200 // 0x00, 0x00, // uint16_t startChar
201 // 0x00, 0x00, // uint16_t endChar
202 // 0x00, 0x01, // uint16_t font-ID
203 // 0x00, // uint8_t face-style-flags
204 // 0x12, // uint8_t font-size
205 // 0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4]
206 // };
207 // FontTableBox {
208 // 0x00, 0x00, 0x00, 0x12, // uint32_t size
209 // 'f', 't', 'a', 'b', // uint8_t name[4]
210 // 0x00, 0x01, // uint16_t entry-count
211 // FontRecord {
212 // 0x00, 0x01, // uint16_t font-ID
213 // 0x05, // uint8_t font-name-length
214 // 'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length]
215 // };
216 // };
217
218 // Populate sample description from ASS header
219 3 ass = (ASS*)s->ass_ctx;
220 // Compute font scaling factor based on (optionally) provided
221 // output video height and ASS script play_res_y
222
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 3 if (s->frame_height && ass->script_info.play_res_y)
223 ✗ s->font_scale_factor = (double)s->frame_height / ass->script_info.play_res_y;
224 else
225 3 s->font_scale_factor = 1;
226
227 3 style = ff_ass_style_get(s->ass_ctx, "Default");
228
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 3 if (!style && ass->styles_count) {
229 ✗ style = &ass->styles[0];
230 }
231 3 s->d.style_fontID = DEFAULT_STYLE_FONT_ID;
232 3 s->d.style_fontsize = DEFAULT_STYLE_FONTSIZE;
233 3 s->d.style_color = DEFAULT_STYLE_COLOR;
234 3 s->d.style_flag = DEFAULT_STYLE_FLAG;
235
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 3 if (style) {
236 2 s->d.style_fontsize = FONTSIZE_SCALE(s, style->font_size);
237 2 s->d.style_color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8 |
238 2 255 - ((uint32_t)style->primary_color >> 24);
239 2 s->d.style_flag = (!!style->bold * STYLE_FLAG_BOLD) |
240
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 4 (!!style->italic * STYLE_FLAG_ITALIC) |
241
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 2 (!!style->underline * STYLE_FLAG_UNDERLINE);
242 2 back_color = (BGR_TO_RGB(style->back_color & 0xffffff) << 8) |
243 2 (255 - ((uint32_t)style->back_color >> 24));
244 }
245
246 3 bytestream_put_be32(&p, 0); // displayFlags
247 3 bytestream_put_be16(&p, 0x01FF); // horizontal/vertical justification (2x int8_t)
248 3 bytestream_put_be32(&p, back_color);
249 3 bytestream_put_be64(&p, 0); // BoxRecord - 4xint16_t: top, left, bottom, right
250 // StyleRecord {
251 3 bytestream_put_be16(&p, s->d.style_start);
252 3 bytestream_put_be16(&p, s->d.style_end);
253 3 bytestream_put_be16(&p, s->d.style_fontID);
254 3 bytestream_put_byte(&p, s->d.style_flag);
255 3 bytestream_put_byte(&p, s->d.style_fontsize);
256 3 bytestream_put_be32(&p, s->d.style_color);
257 // };
258 3 av_bprint_append_any(&s->buffer, buf, 30);
259
260 // Build font table
261 // We can't build a complete font table since that would require
262 // scanning all dialogs first. But we can at least fill in what
263 // is available in the ASS header
264
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 3 if (style && ass->styles_count) {
265 // Find unique font names
266
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 2 if (style->font_name) {
267 2 av_dynarray_add(&s->fonts, &s->font_count, style->font_name);
268 2 font_names_total_len += strlen(style->font_name);
269 }
270
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 4 for (i = 0; i < ass->styles_count; i++) {
271 2 int found = 0;
272
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 2 if (!ass->styles[i].font_name)
273 ✗ continue;
274
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 2 for (j = 0; j < s->font_count; j++) {
275
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 2 if (!strcmp(s->fonts[j], ass->styles[i].font_name)) {
276 2 found = 1;
277 2 break;
278 }
279 }
280
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 2 if (!found) {
281 ✗ av_dynarray_add(&s->fonts, &s->font_count,
282 ✗ ass->styles[i].font_name);
283 ✗ font_names_total_len += strlen(ass->styles[i].font_name);
284 }
285 }
286 } else {
287 1 av_dynarray_add(&s->fonts, &s->font_count, (char*)"Serif");
288 1 font_names_total_len = strlen("Serif");
289 }
290
291 // FontTableBox {
292 3 p = buf;
293 3 bytestream_put_be32(&p, SIZE_ADD + 3 * s->font_count + font_names_total_len); // Size
294 3 bytestream_put_be32(&p, MKBETAG('f','t','a','b'));
295 3 bytestream_put_be16(&p, s->font_count);
296
297 3 av_bprint_append_any(&s->buffer, buf, 10);
298 // FontRecord {
299
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 6 for (i = 0; i < s->font_count; i++) {
300 3 size_t len = strlen(s->fonts[i]);
301
302 3 p = buf;
303 3 bytestream_put_be16(&p, i + 1); //fontID
304 3 bytestream_put_byte(&p, len);
305
306 3 av_bprint_append_any(&s->buffer, buf, 3);
307 3 av_bprint_append_any(&s->buffer, s->fonts[i], len);
308 }
309 // };
310 // };
311
312
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 3 if (!av_bprint_is_complete(&s->buffer)) {
313 ✗ ret = AVERROR(ENOMEM);
314 ✗ goto fail;
315 }
316
317 3 avctx->extradata_size = s->buffer.len;
318 3 avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
319
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 3 if (!avctx->extradata) {
320 ✗ ret = AVERROR(ENOMEM);
321 ✗ goto fail;
322 }
323
324 3 memcpy(avctx->extradata, s->buffer.str, avctx->extradata_size);
325 3 ret = 0;
326 3 fail:
327 3 av_bprint_finalize(&s->buffer, NULL);
328
329 3 return ret;
330 }
331
332 3 static av_cold int mov_text_encode_init(AVCodecContext *avctx)
333 {
334 int ret;
335 3 MovTextContext *s = avctx->priv_data;
336 3 s->avctx = avctx;
337
338 3 s->ass_ctx = ff_ass_split(avctx->subtitle_header);
339
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 3 if (!s->ass_ctx)
340 ✗ return AVERROR_INVALIDDATA;
341 3 ret = encode_sample_description(avctx);
342
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 3 if (ret < 0)
343 ✗ return ret;
344
345 3 return 0;
346 }
347
348 // Start a new style box if needed
349 7 static int mov_text_style_start(MovTextContext *s)
350 {
351 // there's an existing style entry
352
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 7 if (s->style_attributes_temp.style_start == s->text_pos)
353 // Still at same text pos, use same entry
354 4 return 1;
355
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 3 if (s->style_attributes_temp.style_flag != s->d.style_flag ||
356
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 3 s->style_attributes_temp.style_color != s->d.style_color ||
357
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 3 s->style_attributes_temp.style_fontID != s->d.style_fontID ||
358
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 3 s->style_attributes_temp.style_fontsize != s->d.style_fontsize) {
359 StyleBox *tmp;
360
361 // last style != defaults, end the style entry and start a new one
362 ✗ if (s->count + 1 > FFMIN(SIZE_MAX / sizeof(*s->style_attributes), UINT16_MAX) ||
363 ✗ !(tmp = av_fast_realloc(s->style_attributes,
364 &s->style_attributes_bytes_allocated,
365 ✗ (s->count + 1) * sizeof(*s->style_attributes)))) {
366 ✗ mov_text_cleanup(s);
367 ✗ av_bprint_clear(&s->buffer);
368 ✗ s->box_flags &= ~STYL_BOX;
369 ✗ return 0;
370 }
371 ✗ s->style_attributes = tmp;
372 ✗ s->style_attributes_temp.style_end = s->text_pos;
373 ✗ s->style_attributes[s->count++] = s->style_attributes_temp;
374 ✗ s->box_flags |= STYL_BOX;
375 ✗ s->style_attributes_temp = s->d;
376 ✗ s->style_attributes_temp.style_start = s->text_pos;
377 } else { // style entry matches defaults, drop entry
378 3 s->style_attributes_temp = s->d;
379 3 s->style_attributes_temp.style_start = s->text_pos;
380 }
381 3 return 1;
382 }
383
384 ✗ static uint8_t mov_text_style_to_flag(const char style)
385 {
386 ✗ uint8_t style_flag = 0;
387
388 ✗ switch (style){
389 ✗ case 'b':
390 ✗ style_flag = STYLE_FLAG_BOLD;
391 ✗ break;
392 ✗ case 'i':
393 ✗ style_flag = STYLE_FLAG_ITALIC;
394 ✗ break;
395 ✗ case 'u':
396 ✗ style_flag = STYLE_FLAG_UNDERLINE;
397 ✗ break;
398 }
399 ✗ return style_flag;
400 }
401
402 3 static void mov_text_style_set(MovTextContext *s, uint8_t style_flags)
403 {
404
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 3 if (!((s->style_attributes_temp.style_flag & style_flags) ^ style_flags)) {
405 // setting flags that that are already set
406 3 return;
407 }
408 ✗ if (mov_text_style_start(s))
409 ✗ s->style_attributes_temp.style_flag |= style_flags;
410 }
411
412 ✗ static void mov_text_style_cb(void *priv, const char style, int close)
413 {
414 ✗ MovTextContext *s = priv;
415 ✗ uint8_t style_flag = mov_text_style_to_flag(style);
416
417 ✗ if (!!(s->style_attributes_temp.style_flag & style_flag) != close) {
418 // setting flag that is already set
419 ✗ return;
420 }
421 ✗ if (mov_text_style_start(s)) {
422 ✗ if (!close)
423 ✗ s->style_attributes_temp.style_flag |= style_flag;
424 else
425 ✗ s->style_attributes_temp.style_flag &= ~style_flag;
426 }
427 }
428
429 3 static void mov_text_color_set(MovTextContext *s, uint32_t color)
430 {
431
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 3 if ((s->style_attributes_temp.style_color & 0xffffff00) == color) {
432 // color hasn't changed
433 2 return;
434 }
435
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 1 if (mov_text_style_start(s))
436 1 s->style_attributes_temp.style_color = (color & 0xffffff00) |
437 1 (s->style_attributes_temp.style_color & 0xff);
438 }
439
440 ✗ static void mov_text_color_cb(void *priv, unsigned int color, unsigned int color_id)
441 {
442 ✗ MovTextContext *s = priv;
443
444 ✗ color = BGR_TO_RGB(color) << 8;
445 ✗ if (color_id == 1) { //primary color changes
446 ✗ mov_text_color_set(s, color);
447 ✗ } else if (color_id == 2) { //secondary color changes
448 ✗ if (!(s->box_flags & HCLR_BOX))
449 // Highlight alpha not set yet, use current primary alpha
450 ✗ s->hclr.color = s->style_attributes_temp.style_color;
451 ✗ if (!(s->box_flags & HLIT_BOX) || s->hlit.start == s->text_pos) {
452 ✗ s->box_flags |= HCLR_BOX;
453 ✗ s->box_flags |= HLIT_BOX;
454 ✗ s->hlit.start = s->text_pos;
455 ✗ s->hclr.color = color | (s->hclr.color & 0xFF);
456 }
457 else //close tag
458 ✗ s->hlit.end = s->text_pos;
459 /* If there are more than one secondary color changes in ASS,
460 take start of first section and end of last section. Movtext
461 allows only one highlight box per sample.
462 */
463 }
464 // Movtext does not support changes to other color_id (outline, background)
465 ✗ }
466
467 3 static void mov_text_alpha_set(MovTextContext *s, uint8_t alpha)
468 {
469
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 3 if ((s->style_attributes_temp.style_color & 0xff) == alpha) {
470 // color hasn't changed
471 2 return;
472 }
473
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 1 if (mov_text_style_start(s))
474 1 s->style_attributes_temp.style_color =
475 1 (s->style_attributes_temp.style_color & 0xffffff00) | alpha;
476 }
477
478 ✗ static void mov_text_alpha_cb(void *priv, int alpha, int alpha_id)
479 {
480 ✗ MovTextContext *s = priv;
481
482 ✗ alpha = 255 - alpha;
483 ✗ if (alpha_id == 1) // primary alpha changes
484 ✗ mov_text_alpha_set(s, alpha);
485 ✗ else if (alpha_id == 2) { //secondary alpha changes
486 ✗ if (!(s->box_flags & HCLR_BOX))
487 // Highlight color not set yet, use current primary color
488 ✗ s->hclr.color = s->style_attributes_temp.style_color;
489 ✗ if (!(s->box_flags & HLIT_BOX) || s->hlit.start == s->text_pos) {
490 ✗ s->box_flags |= HCLR_BOX;
491 ✗ s->box_flags |= HLIT_BOX;
492 ✗ s->hlit.start = s->text_pos;
493 ✗ s->hclr.color = (s->hclr.color & 0xffffff00) | alpha;
494 }
495 else //close tag
496 ✗ s->hlit.end = s->text_pos;
497 }
498 // Movtext does not support changes to other alpha_id (outline, background)
499 ✗ }
500
501 3 static uint16_t find_font_id(MovTextContext *s, const char *name)
502 {
503
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 3 if (!name)
504 ✗ return 1;
505
506
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 3 for (int i = 0; i < s->font_count; i++) {
507
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 3 if (!strcmp(name, s->fonts[i]))
508 3 return i + 1;
509 }
510 ✗ return 1;
511 }
512
513 3 static void mov_text_font_name_set(MovTextContext *s, const char *name)
514 {
515 3 int fontID = find_font_id(s, name);
516
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 3 if (s->style_attributes_temp.style_fontID == fontID) {
517 // color hasn't changed
518 2 return;
519 }
520
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 1 if (mov_text_style_start(s))
521 1 s->style_attributes_temp.style_fontID = fontID;
522 }
523
524 ✗ static void mov_text_font_name_cb(void *priv, const char *name)
525 {
526 ✗ mov_text_font_name_set((MovTextContext*)priv, name);
527 ✗ }
528
529 3 static void mov_text_font_size_set(MovTextContext *s, int size)
530 {
531 3 size = FONTSIZE_SCALE(s, size);
532
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 3 if (s->style_attributes_temp.style_fontsize == size) {
533 // color hasn't changed
534 2 return;
535 }
536
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 1 if (mov_text_style_start(s))
537 1 s->style_attributes_temp.style_fontsize = size;
538 }
539
540 ✗ static void mov_text_font_size_cb(void *priv, int size)
541 {
542 ✗ mov_text_font_size_set((MovTextContext*)priv, size);
543 ✗ }
544
545 3 static void mov_text_end_cb(void *priv)
546 {
547 // End of text, close any open style record
548 3 mov_text_style_start((MovTextContext*)priv);
549 3 }
550
551 3 static void mov_text_ass_style_set(MovTextContext *s, ASSStyle *style)
552 {
553 uint8_t style_flags, alpha;
554 uint32_t color;
555
556
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 3 if (style) {
557 3 style_flags = (!!style->bold * STYLE_FLAG_BOLD) |
558
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 6 (!!style->italic * STYLE_FLAG_ITALIC) |
559
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 3 (!!style->underline * STYLE_FLAG_UNDERLINE);
560 3 mov_text_style_set(s, style_flags);
561 3 color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8;
562 3 mov_text_color_set(s, color);
563 3 alpha = 255 - ((uint32_t)style->primary_color >> 24);
564 3 mov_text_alpha_set(s, alpha);
565 3 mov_text_font_size_set(s, style->font_size);
566 3 mov_text_font_name_set(s, style->font_name);
567 } else {
568 // End current style record, go back to defaults
569 ✗ mov_text_style_start(s);
570 }
571 3 }
572
573 3 static void mov_text_dialog(MovTextContext *s, ASSDialog *dialog)
574 {
575 3 ASSStyle *style = ff_ass_style_get(s->ass_ctx, dialog->style);
576
577 3 s->ass_dialog_style = style;
578 3 mov_text_ass_style_set(s, style);
579 3 }
580
581 ✗ static void mov_text_cancel_overrides_cb(void *priv, const char *style_name)
582 {
583 ✗ MovTextContext *s = priv;
584 ASSStyle *style;
585
586 ✗ if (!style_name || !*style_name)
587 ✗ style = s->ass_dialog_style;
588 else
589 ✗ style= ff_ass_style_get(s->ass_ctx, style_name);
590
591 ✗ mov_text_ass_style_set(s, style);
592 ✗ }
593
594 5 static unsigned utf8_strlen(const char *text, int len)
595 {
596 5 unsigned i = 0, ret = 0;
597
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 48 while (i < len) {
598 43 char c = text[i];
599
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 43 if ((c & 0x80) == 0)
600 43 i += 1;
601 ✗ else if ((c & 0xE0) == 0xC0)
602 ✗ i += 2;
603 ✗ else if ((c & 0xF0) == 0xE0)
604 ✗ i += 3;
605 ✗ else if ((c & 0xF8) == 0xF0)
606 ✗ i += 4;
607 else
608 ✗ return 0;
609 43 ret++;
610 }
611 5 return ret;
612 }
613
614 5 static void mov_text_text_cb(void *priv, const char *text, int len)
615 {
616 5 unsigned utf8_len = utf8_strlen(text, len);
617 5 MovTextContext *s = priv;
618 5 av_bprint_append_data(&s->buffer, text, len);
619 // If it's not utf-8, just use the byte length
620
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 5 s->text_pos += utf8_len ? utf8_len : len;
621 5 }
622
623 2 static void mov_text_new_line_cb(void *priv, int forced)
624 {
625 2 MovTextContext *s = priv;
626 2 s->text_pos += 1;
627 2 av_bprint_chars(&s->buffer, '\n', 1);
628 2 }
629
630 static const ASSCodesCallbacks mov_text_callbacks = {
631 .text = mov_text_text_cb,
632 .new_line = mov_text_new_line_cb,
633 .style = mov_text_style_cb,
634 .color = mov_text_color_cb,
635 .alpha = mov_text_alpha_cb,
636 .font_name = mov_text_font_name_cb,
637 .font_size = mov_text_font_size_cb,
638 .cancel_overrides = mov_text_cancel_overrides_cb,
639 .end = mov_text_end_cb,
640 };
641
642 3 static int mov_text_encode_frame(AVCodecContext *avctx, unsigned char *buf,
643 int bufsize, const AVSubtitle *sub)
644 {
645 3 MovTextContext *s = avctx->priv_data;
646 ASSDialog *dialog;
647 int i, length;
648
649
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 3 if (bufsize < 3)
650 ✗ goto too_small;
651
652 3 s->text_pos = 0;
653 3 s->count = 0;
654 3 s->box_flags = 0;
655
656 3 av_bprint_init_for_buffer(&s->buffer, buf + 2, bufsize - 2);
657
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 6 for (i = 0; i < sub->num_rects; i++) {
658 3 const char *ass = sub->rects[i]->ass;
659
660
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 3 if (sub->rects[i]->type != SUBTITLE_ASS) {
661 ✗ av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
662 ✗ return AVERROR(EINVAL);
663 }
664
665 3 dialog = ff_ass_split_dialog(s->ass_ctx, ass);
666
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 3 if (!dialog)
667 ✗ return AVERROR(ENOMEM);
668 3 mov_text_dialog(s, dialog);
669 3 ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text);
670 3 ff_ass_free_dialog(&dialog);
671 }
672
673
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 3 if (s->buffer.len > UINT16_MAX)
674 ✗ return AVERROR(ERANGE);
675 3 AV_WB16(buf, s->buffer.len);
676
677
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 12 for (size_t j = 0; j < box_count; j++)
678 9 box_types[j].encode(s);
679
680
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 3 if (!s->buffer.len)
681 ✗ return 0;
682
683
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 3 if (!av_bprint_is_complete(&s->buffer)) {
684 ✗ too_small:
685 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
686 ✗ return AVERROR_BUFFER_TOO_SMALL;
687 }
688
689 3 length = s->buffer.len + 2;
690
691 3 return length;
692 }
693
694 #define OFFSET(x) offsetof(MovTextContext, x)
695 #define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
696 static const AVOption options[] = {
697 { "height", "Frame height, usually video height", OFFSET(frame_height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS },
698 { NULL },
699 };
700
701 static const AVClass mov_text_encoder_class = {
702 .class_name = "MOV text enoder",
703 .item_name = av_default_item_name,
704 .option = options,
705 .version = LIBAVUTIL_VERSION_INT,
706 };
707
708 const FFCodec ff_movtext_encoder = {
709 .p.name = "mov_text",
710 CODEC_LONG_NAME("3GPP Timed Text subtitle"),
711 .p.type = AVMEDIA_TYPE_SUBTITLE,
712 .p.id = AV_CODEC_ID_MOV_TEXT,
713 .priv_data_size = sizeof(MovTextContext),
714 .p.priv_class = &mov_text_encoder_class,
715 .init = mov_text_encode_init,
716 FF_CODEC_ENCODE_SUB_CB(mov_text_encode_frame),
717 .close = mov_text_encode_close,
718 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
719 };
720