84aaa5f7aa42fed1c7c8c5fd475270d1e0f48387
[libav.git] / libavfilter / vf_drawtext.c
1 /*
2 * Copyright (c) 2011 Stefano Sabatini
3 * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
4 * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
5 *
6 * This file is part of Libav.
7 *
8 * Libav is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * Libav is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * drawtext filter, based on the original vhook/drawtext.c
26 * filter by Gustavo Sverzut Barbieri
27 */
28
29 #include <sys/time.h>
30 #include <time.h>
31
32 #include "libavutil/colorspace.h"
33 #include "libavutil/file.h"
34 #include "libavutil/eval.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/random_seed.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavutil/tree.h"
41 #include "libavutil/lfg.h"
42 #include "avfilter.h"
43 #include "drawutils.h"
44 #include "formats.h"
45 #include "internal.h"
46 #include "video.h"
47
48 #undef time
49
50 #include <ft2build.h>
51 #include <freetype/config/ftheader.h>
52 #include FT_FREETYPE_H
53 #include FT_GLYPH_H
54
55 static const char *const var_names[] = {
56 "E",
57 "PHI",
58 "PI",
59 "main_w", "W", ///< width of the main video
60 "main_h", "H", ///< height of the main video
61 "text_w", "w", ///< width of the overlay text
62 "text_h", "h", ///< height of the overlay text
63 "x",
64 "y",
65 "n", ///< number of processed frames
66 "t", ///< timestamp expressed in seconds
67 NULL
68 };
69
70 static const char *const fun2_names[] = {
71 "rand"
72 };
73
74 static double drand(void *opaque, double min, double max)
75 {
76 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
77 }
78
79 typedef double (*eval_func2)(void *, double a, double b);
80
81 static const eval_func2 fun2[] = {
82 drand,
83 NULL
84 };
85
86 enum var_name {
87 VAR_E,
88 VAR_PHI,
89 VAR_PI,
90 VAR_MAIN_W, VAR_MW,
91 VAR_MAIN_H, VAR_MH,
92 VAR_TEXT_W, VAR_TW,
93 VAR_TEXT_H, VAR_TH,
94 VAR_X,
95 VAR_Y,
96 VAR_N,
97 VAR_T,
98 VAR_VARS_NB
99 };
100
101 typedef struct {
102 const AVClass *class;
103 uint8_t *fontfile; ///< font to be used
104 uint8_t *text; ///< text to be drawn
105 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
106 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
107 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
108 FT_Vector *positions; ///< positions for each element in the text
109 size_t nb_positions; ///< number of elements of positions array
110 char *textfile; ///< file with text to be drawn
111 int x, y; ///< position to start drawing text
112 int w, h; ///< dimension of the text block
113 int shadowx, shadowy;
114 unsigned int fontsize; ///< font size to use
115 char *fontcolor_string; ///< font color as string
116 char *boxcolor_string; ///< box color as string
117 char *shadowcolor_string; ///< shadow color as string
118 uint8_t fontcolor[4]; ///< foreground color
119 uint8_t boxcolor[4]; ///< background color
120 uint8_t shadowcolor[4]; ///< shadow color
121 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
122 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
123 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
124
125 short int draw_box; ///< draw box around text - true or false
126 int use_kerning; ///< font kerning is used - true/false
127 int tabsize; ///< tab size
128 int fix_bounds; ///< do we let it go out of frame bounds - t/f
129
130 FT_Library library; ///< freetype font library handle
131 FT_Face face; ///< freetype font face handle
132 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
133 int hsub, vsub; ///< chroma subsampling values
134 int is_packed_rgb;
135 int pixel_step[4]; ///< distance in bytes between the component of each pixel
136 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
137 uint8_t *box_line[4]; ///< line used for filling the box background
138 char *x_expr, *y_expr;
139 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
140 double var_values[VAR_VARS_NB];
141 char *d_expr;
142 AVExpr *d_pexpr;
143 int draw; ///< set to zero to prevent drawing
144 AVLFG prng; ///< random
145 } DrawTextContext;
146
147 #define OFFSET(x) offsetof(DrawTextContext, x)
148
149 static const AVOption drawtext_options[]= {
150 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
151 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
152 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
153 {"fontcolor","set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
154 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
155 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
156 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
157 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, 72 },
158 {"x", "set x", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
159 {"y", "set y", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
160 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
161 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
162 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
163 {"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
164 {"fix_bounds", "if true, check and fix text coords to avoid clipping",
165 OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },
166
167 /* FT_LOAD_* flags */
168 {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
169 {"default", "set default", 0, AV_OPT_TYPE_CONST, {FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
170 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
171 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
172 {"render", "set render", 0, AV_OPT_TYPE_CONST, {FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
173 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
174 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
175 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
176 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
177 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
178 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
179 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
180 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
181 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
182 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
183 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
184 {NULL},
185 };
186
187 static const char *drawtext_get_name(void *ctx)
188 {
189 return "drawtext";
190 }
191
192 static const AVClass drawtext_class = {
193 "DrawTextContext",
194 drawtext_get_name,
195 drawtext_options
196 };
197
198 #undef __FTERRORS_H__
199 #define FT_ERROR_START_LIST {
200 #define FT_ERRORDEF(e, v, s) { (e), (s) },
201 #define FT_ERROR_END_LIST { 0, NULL } };
202
203 struct ft_error
204 {
205 int err;
206 const char *err_msg;
207 } static ft_errors[] =
208 #include FT_ERRORS_H
209
210 #define FT_ERRMSG(e) ft_errors[e].err_msg
211
212 typedef struct {
213 FT_Glyph *glyph;
214 uint32_t code;
215 FT_Bitmap bitmap; ///< array holding bitmaps of font
216 FT_BBox bbox;
217 int advance;
218 int bitmap_left;
219 int bitmap_top;
220 } Glyph;
221
222 static int glyph_cmp(void *key, const void *b)
223 {
224 const Glyph *a = key, *bb = b;
225 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
226 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
227 }
228
229 /**
230 * Load glyphs corresponding to the UTF-32 codepoint code.
231 */
232 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
233 {
234 DrawTextContext *dtext = ctx->priv;
235 Glyph *glyph;
236 struct AVTreeNode *node = NULL;
237 int ret;
238
239 /* load glyph into dtext->face->glyph */
240 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
241 return AVERROR(EINVAL);
242
243 /* save glyph */
244 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
245 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
246 ret = AVERROR(ENOMEM);
247 goto error;
248 }
249 glyph->code = code;
250
251 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
252 ret = AVERROR(EINVAL);
253 goto error;
254 }
255
256 glyph->bitmap = dtext->face->glyph->bitmap;
257 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
258 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
259 glyph->advance = dtext->face->glyph->advance.x >> 6;
260
261 /* measure text height to calculate text_height (or the maximum text height) */
262 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
263
264 /* cache the newly created glyph */
265 if (!(node = av_mallocz(av_tree_node_size))) {
266 ret = AVERROR(ENOMEM);
267 goto error;
268 }
269 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
270
271 if (glyph_ptr)
272 *glyph_ptr = glyph;
273 return 0;
274
275 error:
276 if (glyph)
277 av_freep(&glyph->glyph);
278 av_freep(&glyph);
279 av_freep(&node);
280 return ret;
281 }
282
283 static av_cold int init(AVFilterContext *ctx, const char *args)
284 {
285 int err;
286 DrawTextContext *dtext = ctx->priv;
287 Glyph *glyph;
288
289 dtext->class = &drawtext_class;
290 av_opt_set_defaults(dtext);
291 dtext->fontcolor_string = av_strdup("black");
292 dtext->boxcolor_string = av_strdup("white");
293 dtext->shadowcolor_string = av_strdup("black");
294
295 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
296 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
297 return err;
298 }
299
300 if (!dtext->fontfile) {
301 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
302 return AVERROR(EINVAL);
303 }
304
305 if (dtext->textfile) {
306 uint8_t *textbuf;
307 size_t textbuf_size;
308
309 if (dtext->text) {
310 av_log(ctx, AV_LOG_ERROR,
311 "Both text and text file provided. Please provide only one\n");
312 return AVERROR(EINVAL);
313 }
314 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
315 av_log(ctx, AV_LOG_ERROR,
316 "The text file '%s' could not be read or is empty\n",
317 dtext->textfile);
318 return err;
319 }
320
321 if (!(dtext->text = av_malloc(textbuf_size+1)))
322 return AVERROR(ENOMEM);
323 memcpy(dtext->text, textbuf, textbuf_size);
324 dtext->text[textbuf_size] = 0;
325 av_file_unmap(textbuf, textbuf_size);
326 }
327
328 if (!dtext->text) {
329 av_log(ctx, AV_LOG_ERROR,
330 "Either text or a valid file must be provided\n");
331 return AVERROR(EINVAL);
332 }
333
334 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
335 av_log(ctx, AV_LOG_ERROR,
336 "Invalid font color '%s'\n", dtext->fontcolor_string);
337 return err;
338 }
339
340 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
341 av_log(ctx, AV_LOG_ERROR,
342 "Invalid box color '%s'\n", dtext->boxcolor_string);
343 return err;
344 }
345
346 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
347 av_log(ctx, AV_LOG_ERROR,
348 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
349 return err;
350 }
351
352 if ((err = FT_Init_FreeType(&(dtext->library)))) {
353 av_log(ctx, AV_LOG_ERROR,
354 "Could not load FreeType: %s\n", FT_ERRMSG(err));
355 return AVERROR(EINVAL);
356 }
357
358 /* load the face, and set up the encoding, which is by default UTF-8 */
359 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
360 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
361 dtext->fontfile, FT_ERRMSG(err));
362 return AVERROR(EINVAL);
363 }
364 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
365 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
366 dtext->fontsize, FT_ERRMSG(err));
367 return AVERROR(EINVAL);
368 }
369
370 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
371
372 /* load the fallback glyph with code 0 */
373 load_glyph(ctx, NULL, 0);
374
375 /* set the tabsize in pixels */
376 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
377 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
378 return err;
379 }
380 dtext->tabsize *= glyph->advance;
381
382 #if !HAVE_LOCALTIME_R
383 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
384 #endif
385
386 return 0;
387 }
388
389 static int query_formats(AVFilterContext *ctx)
390 {
391 static const enum PixelFormat pix_fmts[] = {
392 PIX_FMT_ARGB, PIX_FMT_RGBA,
393 PIX_FMT_ABGR, PIX_FMT_BGRA,
394 PIX_FMT_RGB24, PIX_FMT_BGR24,
395 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
396 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
397 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
398 PIX_FMT_NONE
399 };
400
401 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
402 return 0;
403 }
404
405 static int glyph_enu_free(void *opaque, void *elem)
406 {
407 av_free(elem);
408 return 0;
409 }
410
411 static av_cold void uninit(AVFilterContext *ctx)
412 {
413 DrawTextContext *dtext = ctx->priv;
414 int i;
415
416 av_freep(&dtext->fontfile);
417 av_freep(&dtext->text);
418 av_freep(&dtext->expanded_text);
419 av_freep(&dtext->fontcolor_string);
420 av_freep(&dtext->boxcolor_string);
421 av_freep(&dtext->positions);
422 av_freep(&dtext->shadowcolor_string);
423 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
424 av_tree_destroy(dtext->glyphs);
425 dtext->glyphs = 0;
426 FT_Done_Face(dtext->face);
427 FT_Done_FreeType(dtext->library);
428
429 for (i = 0; i < 4; i++) {
430 av_freep(&dtext->box_line[i]);
431 dtext->pixel_step[i] = 0;
432 }
433
434 }
435
436 static inline int is_newline(uint32_t c)
437 {
438 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
439 }
440
441 static int dtext_prepare_text(AVFilterContext *ctx)
442 {
443 DrawTextContext *dtext = ctx->priv;
444 uint32_t code = 0, prev_code = 0;
445 int x = 0, y = 0, i = 0, ret;
446 int text_height, baseline;
447 char *text = dtext->text;
448 uint8_t *p;
449 int str_w = 0, len;
450 int y_min = 32000, y_max = -32000;
451 FT_Vector delta;
452 Glyph *glyph = NULL, *prev_glyph = NULL;
453 Glyph dummy = { 0 };
454 int width = ctx->inputs[0]->w;
455 int height = ctx->inputs[0]->h;
456
457 #if HAVE_LOCALTIME_R
458 time_t now = time(0);
459 struct tm ltime;
460 uint8_t *buf = dtext->expanded_text;
461 int buf_size = dtext->expanded_text_size;
462
463 if (!buf)
464 buf_size = 2*strlen(dtext->text)+1;
465
466 localtime_r(&now, &ltime);
467
468 while ((buf = av_realloc(buf, buf_size))) {
469 *buf = 1;
470 if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)
471 break;
472 buf_size *= 2;
473 }
474
475 if (!buf)
476 return AVERROR(ENOMEM);
477 text = dtext->expanded_text = buf;
478 dtext->expanded_text_size = buf_size;
479 #endif
480
481 if ((len = strlen(text)) > dtext->nb_positions) {
482 FT_Vector *p = av_realloc(dtext->positions,
483 len * sizeof(*dtext->positions));
484 if (!p) {
485 av_freep(dtext->positions);
486 dtext->nb_positions = 0;
487 return AVERROR(ENOMEM);
488 } else {
489 dtext->positions = p;
490 dtext->nb_positions = len;
491 }
492 }
493
494 /* load and cache glyphs */
495 for (i = 0, p = text; *p; i++) {
496 GET_UTF8(code, *p++, continue;);
497
498 /* get glyph */
499 dummy.code = code;
500 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
501 if (!glyph) {
502 ret = load_glyph(ctx, &glyph, code);
503 if (ret)
504 return ret;
505 }
506
507 y_min = FFMIN(glyph->bbox.yMin, y_min);
508 y_max = FFMAX(glyph->bbox.yMax, y_max);
509 }
510 text_height = y_max - y_min;
511 baseline = y_max;
512
513 /* compute and save position for each glyph */
514 glyph = NULL;
515 for (i = 0, p = text; *p; i++) {
516 GET_UTF8(code, *p++, continue;);
517
518 /* skip the \n in the sequence \r\n */
519 if (prev_code == '\r' && code == '\n')
520 continue;
521
522 prev_code = code;
523 if (is_newline(code)) {
524 str_w = FFMAX(str_w, x - dtext->x);
525 y += text_height;
526 x = 0;
527 continue;
528 }
529
530 /* get glyph */
531 prev_glyph = glyph;
532 dummy.code = code;
533 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
534
535 /* kerning */
536 if (dtext->use_kerning && prev_glyph && glyph->code) {
537 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
538 ft_kerning_default, &delta);
539 x += delta.x >> 6;
540 }
541
542 if (x + glyph->bbox.xMax >= width) {
543 str_w = FFMAX(str_w, x);
544 y += text_height;
545 x = 0;
546 }
547
548 /* save position */
549 dtext->positions[i].x = x + glyph->bitmap_left;
550 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
551 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
552 else x += glyph->advance;
553 }
554
555 str_w = FFMIN(width - 1, FFMAX(str_w, x));
556 y = FFMIN(y + text_height, height - 1);
557
558 dtext->w = str_w;
559 dtext->var_values[VAR_TEXT_W] = dtext->var_values[VAR_TW] = dtext->w;
560 dtext->h = y;
561 dtext->var_values[VAR_TEXT_H] = dtext->var_values[VAR_TH] = dtext->h;
562
563 return 0;
564 }
565
566
567 static int config_input(AVFilterLink *inlink)
568 {
569 AVFilterContext *ctx = inlink->dst;
570 DrawTextContext *dtext = ctx->priv;
571 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
572 int ret;
573
574 dtext->hsub = pix_desc->log2_chroma_w;
575 dtext->vsub = pix_desc->log2_chroma_h;
576
577 dtext->var_values[VAR_E ] = M_E;
578 dtext->var_values[VAR_PHI] = M_PHI;
579 dtext->var_values[VAR_PI ] = M_PI;
580
581 dtext->var_values[VAR_MAIN_W] =
582 dtext->var_values[VAR_MW] = ctx->inputs[0]->w;
583 dtext->var_values[VAR_MAIN_H] =
584 dtext->var_values[VAR_MH] = ctx->inputs[0]->h;
585
586 dtext->var_values[VAR_X] = 0;
587 dtext->var_values[VAR_Y] = 0;
588 dtext->var_values[VAR_N] = 0;
589 dtext->var_values[VAR_T] = NAN;
590
591 av_lfg_init(&dtext->prng, av_get_random_seed());
592
593 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
594 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
595 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
596 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
597 (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
598 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
599 return AVERROR(EINVAL);
600
601 if ((ret =
602 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
603 inlink->w, dtext->boxcolor,
604 inlink->format, dtext->boxcolor_rgba,
605 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
606 return ret;
607
608 if (!dtext->is_packed_rgb) {
609 uint8_t *rgba = dtext->fontcolor_rgba;
610 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
611 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
612 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
613 dtext->fontcolor[3] = rgba[3];
614 rgba = dtext->shadowcolor_rgba;
615 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
616 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
617 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
618 dtext->shadowcolor[3] = rgba[3];
619 }
620
621 dtext->draw = 1;
622
623 return dtext_prepare_text(ctx);
624 }
625
626 #define GET_BITMAP_VAL(r, c) \
627 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
628 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
629 bitmap->buffer[(r) * bitmap->pitch + (c)]
630
631 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
632 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
633 alpha = yuva_color[3] * (val) * 129; \
634 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
635 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
636 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
637 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
638 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
639 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
640 }\
641 }
642
643 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
644 unsigned int y, unsigned int width, unsigned int height,
645 const uint8_t yuva_color[4], int hsub, int vsub)
646 {
647 int r, c, alpha;
648 unsigned int luma_pos, chroma_pos1, chroma_pos2;
649 uint8_t src_val;
650
651 for (r = 0; r < bitmap->rows && r+y < height; r++) {
652 for (c = 0; c < bitmap->width && c+x < width; c++) {
653 /* get intensity value in the glyph bitmap (source) */
654 src_val = GET_BITMAP_VAL(r, c);
655 if (!src_val)
656 continue;
657
658 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
659 }
660 }
661
662 return 0;
663 }
664
665 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
666 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
667 alpha = rgba_color[3] * (val) * 129; \
668 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
669 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
670 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
671 }
672
673 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
674 unsigned int x, unsigned int y,
675 unsigned int width, unsigned int height, int pixel_step,
676 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
677 {
678 int r, c, alpha;
679 uint8_t *p;
680 uint8_t src_val;
681
682 for (r = 0; r < bitmap->rows && r+y < height; r++) {
683 for (c = 0; c < bitmap->width && c+x < width; c++) {
684 /* get intensity value in the glyph bitmap (source) */
685 src_val = GET_BITMAP_VAL(r, c);
686 if (!src_val)
687 continue;
688
689 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
690 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
691 }
692 }
693
694 return 0;
695 }
696
697 static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
698 unsigned int width, unsigned int height,
699 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
700 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
701 {
702 int i, j, alpha;
703
704 if (color[3] != 0xFF) {
705 if (is_rgba_packed) {
706 uint8_t *p;
707 for (j = 0; j < height; j++)
708 for (i = 0; i < width; i++)
709 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
710 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
711 } else {
712 unsigned int luma_pos, chroma_pos1, chroma_pos2;
713 for (j = 0; j < height; j++)
714 for (i = 0; i < width; i++)
715 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
716 }
717 } else {
718 ff_draw_rectangle(picref->data, picref->linesize,
719 line, pixel_step, hsub, vsub,
720 x, y, width, height);
721 }
722 }
723
724 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
725 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
726 {
727 char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;
728 uint32_t code = 0;
729 int i;
730 uint8_t *p;
731 Glyph *glyph = NULL;
732
733 for (i = 0, p = text; *p; i++) {
734 Glyph dummy = { 0 };
735 GET_UTF8(code, *p++, continue;);
736
737 /* skip new line chars, just go to new line */
738 if (code == '\n' || code == '\r' || code == '\t')
739 continue;
740
741 dummy.code = code;
742 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
743
744 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
745 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
746 return AVERROR(EINVAL);
747
748 if (dtext->is_packed_rgb) {
749 draw_glyph_rgb(picref, &glyph->bitmap,
750 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
751 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
752 } else {
753 draw_glyph_yuv(picref, &glyph->bitmap,
754 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
755 yuvcolor, dtext->hsub, dtext->vsub);
756 }
757 }
758
759 return 0;
760 }
761
762 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
763 int width, int height)
764 {
765 DrawTextContext *dtext = ctx->priv;
766 int ret;
767
768 /* draw box */
769 if (dtext->draw_box)
770 drawbox(picref, dtext->x, dtext->y, dtext->w, dtext->h,
771 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
772 dtext->hsub, dtext->vsub, dtext->is_packed_rgb,
773 dtext->rgba_map);
774
775 if (dtext->shadowx || dtext->shadowy) {
776 if ((ret = draw_glyphs(dtext, picref, width, height,
777 dtext->shadowcolor_rgba,
778 dtext->shadowcolor,
779 dtext->x + dtext->shadowx,
780 dtext->y + dtext->shadowy)) < 0)
781 return ret;
782 }
783
784 if ((ret = draw_glyphs(dtext, picref, width, height,
785 dtext->fontcolor_rgba,
786 dtext->fontcolor,
787 dtext->x,
788 dtext->y)) < 0)
789 return ret;
790
791 return 0;
792 }
793
794 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
795
796 static inline int normalize_double(int *n, double d)
797 {
798 int ret = 0;
799
800 if (isnan(d)) {
801 ret = AVERROR(EINVAL);
802 } else if (d > INT_MAX || d < INT_MIN) {
803 *n = d > INT_MAX ? INT_MAX : INT_MIN;
804 ret = AVERROR(EINVAL);
805 } else
806 *n = round(d);
807
808 return ret;
809 }
810
811 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
812 {
813 AVFilterContext *ctx = inlink->dst;
814 DrawTextContext *dtext = ctx->priv;
815 AVFilterBufferRef *buf_out;
816 int fail = 0;
817
818 if (dtext_prepare_text(ctx) < 0) {
819 av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
820 fail = 1;
821 }
822
823 dtext->var_values[VAR_T] = inpicref->pts == AV_NOPTS_VALUE ?
824 NAN : inpicref->pts * av_q2d(inlink->time_base);
825 dtext->var_values[VAR_X] =
826 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
827 dtext->var_values[VAR_Y] =
828 av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
829 dtext->var_values[VAR_X] =
830 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
831
832 dtext->draw = fail ? 0 :
833 av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
834
835 normalize_double(&dtext->x, dtext->var_values[VAR_X]);
836 normalize_double(&dtext->y, dtext->var_values[VAR_Y]);
837
838 if (dtext->fix_bounds) {
839 if (dtext->x < 0) dtext->x = 0;
840 if (dtext->y < 0) dtext->y = 0;
841 if ((unsigned)dtext->x + (unsigned)dtext->w > inlink->w)
842 dtext->x = inlink->w - dtext->w;
843 if ((unsigned)dtext->y + (unsigned)dtext->h > inlink->h)
844 dtext->y = inlink->h - dtext->h;
845 }
846
847 dtext->x &= ~((1 << dtext->hsub) - 1);
848 dtext->y &= ~((1 << dtext->vsub) - 1);
849
850 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
851 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
852 dtext->x, dtext->y, dtext->x+dtext->w, dtext->y+dtext->h);
853
854 buf_out = avfilter_ref_buffer(inpicref, ~0);
855 ff_start_frame(inlink->dst->outputs[0], buf_out);
856 }
857
858 static void end_frame(AVFilterLink *inlink)
859 {
860 AVFilterLink *outlink = inlink->dst->outputs[0];
861 AVFilterBufferRef *picref = inlink->cur_buf;
862 DrawTextContext *dtext = inlink->dst->priv;
863
864 if (dtext->draw)
865 draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
866
867 dtext->var_values[VAR_N] += 1.0;
868
869 ff_draw_slice(outlink, 0, picref->video->h, 1);
870 ff_end_frame(outlink);
871 }
872
873 AVFilter avfilter_vf_drawtext = {
874 .name = "drawtext",
875 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
876 .priv_size = sizeof(DrawTextContext),
877 .init = init,
878 .uninit = uninit,
879 .query_formats = query_formats,
880
881 .inputs = (const AVFilterPad[]) {{ .name = "default",
882 .type = AVMEDIA_TYPE_VIDEO,
883 .get_video_buffer = ff_null_get_video_buffer,
884 .start_frame = start_frame,
885 .draw_slice = null_draw_slice,
886 .end_frame = end_frame,
887 .config_props = config_input,
888 .min_perms = AV_PERM_WRITE |
889 AV_PERM_READ,
890 .rej_perms = AV_PERM_PRESERVE },
891 { .name = NULL}},
892 .outputs = (const AVFilterPad[]) {{ .name = "default",
893 .type = AVMEDIA_TYPE_VIDEO, },
894 { .name = NULL}},
895 };