f6ce1243e60bf5d4b49e35409b5d4c9b9b4787f2
[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
45 #undef time
46
47 #include <ft2build.h>
48 #include <freetype/config/ftheader.h>
49 #include FT_FREETYPE_H
50 #include FT_GLYPH_H
51
52 static const char *var_names[] = {
53 "E",
54 "PHI",
55 "PI",
56 "main_w", "W", ///< width of the main video
57 "main_h", "H", ///< height of the main video
58 "text_w", "w", ///< width of the overlay text
59 "text_h", "h", ///< height of the overlay text
60 "x",
61 "y",
62 "n", ///< number of processed frames
63 "t", ///< timestamp expressed in seconds
64 NULL
65 };
66
67 static const char *fun2_names[] = {
68 "rand",
69 };
70
71 static double drand(void *opaque, double min, double max)
72 {
73 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
74 }
75
76 typedef double (*eval_func2)(void *, double a, double b);
77
78 static const eval_func2 fun2[] = {
79 drand,
80 NULL
81 };
82
83 enum var_name {
84 VAR_E,
85 VAR_PHI,
86 VAR_PI,
87 VAR_MAIN_W, VAR_MW,
88 VAR_MAIN_H, VAR_MH,
89 VAR_TEXT_W, VAR_TW,
90 VAR_TEXT_H, VAR_TH,
91 VAR_X,
92 VAR_Y,
93 VAR_N,
94 VAR_T,
95 VAR_VARS_NB
96 };
97
98 typedef struct {
99 const AVClass *class;
100 uint8_t *fontfile; ///< font to be used
101 uint8_t *text; ///< text to be drawn
102 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
103 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
104 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
105 FT_Vector *positions; ///< positions for each element in the text
106 size_t nb_positions; ///< number of elements of positions array
107 char *textfile; ///< file with text to be drawn
108 int x, y; ///< position to start drawing text
109 int w, h; ///< dimension of the text block
110 int shadowx, shadowy;
111 unsigned int fontsize; ///< font size to use
112 char *fontcolor_string; ///< font color as string
113 char *boxcolor_string; ///< box color as string
114 char *shadowcolor_string; ///< shadow color as string
115 uint8_t fontcolor[4]; ///< foreground color
116 uint8_t boxcolor[4]; ///< background color
117 uint8_t shadowcolor[4]; ///< shadow color
118 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
119 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
120 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
121
122 short int draw_box; ///< draw box around text - true or false
123 int use_kerning; ///< font kerning is used - true/false
124 int tabsize; ///< tab size
125
126 FT_Library library; ///< freetype font library handle
127 FT_Face face; ///< freetype font face handle
128 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
129 int hsub, vsub; ///< chroma subsampling values
130 int is_packed_rgb;
131 int pixel_step[4]; ///< distance in bytes between the component of each pixel
132 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
133 uint8_t *box_line[4]; ///< line used for filling the box background
134 char *x_expr, *y_expr;
135 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
136 double var_values[VAR_VARS_NB];
137 char *d_expr;
138 AVExpr *d_pexpr;
139 int draw; ///< set to zero to prevent drawing
140 AVLFG prng; ///< random
141 } DrawTextContext;
142
143 #define OFFSET(x) offsetof(DrawTextContext, x)
144
145 static const AVOption drawtext_options[]= {
146 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
147 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
148 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
149 {"fontcolor","set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
150 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
151 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
152 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
153 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, 72 },
154 {"x", "set x", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
155 {"y", "set y", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
156 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
157 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
158 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
159 {"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
160
161 /* FT_LOAD_* flags */
162 {"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" },
163 {"default", "set default", 0, AV_OPT_TYPE_CONST, {FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
164 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
165 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
166 {"render", "set render", 0, AV_OPT_TYPE_CONST, {FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
167 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
168 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
169 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
170 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
171 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
172 {"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" },
173 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
174 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
175 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
176 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
177 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
178 {NULL},
179 };
180
181 static const char *drawtext_get_name(void *ctx)
182 {
183 return "drawtext";
184 }
185
186 static const AVClass drawtext_class = {
187 "DrawTextContext",
188 drawtext_get_name,
189 drawtext_options
190 };
191
192 #undef __FTERRORS_H__
193 #define FT_ERROR_START_LIST {
194 #define FT_ERRORDEF(e, v, s) { (e), (s) },
195 #define FT_ERROR_END_LIST { 0, NULL } };
196
197 struct ft_error
198 {
199 int err;
200 const char *err_msg;
201 } static ft_errors[] =
202 #include FT_ERRORS_H
203
204 #define FT_ERRMSG(e) ft_errors[e].err_msg
205
206 typedef struct {
207 FT_Glyph *glyph;
208 uint32_t code;
209 FT_Bitmap bitmap; ///< array holding bitmaps of font
210 FT_BBox bbox;
211 int advance;
212 int bitmap_left;
213 int bitmap_top;
214 } Glyph;
215
216 static int glyph_cmp(void *key, const void *b)
217 {
218 const Glyph *a = key, *bb = b;
219 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
220 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
221 }
222
223 /**
224 * Load glyphs corresponding to the UTF-32 codepoint code.
225 */
226 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
227 {
228 DrawTextContext *dtext = ctx->priv;
229 Glyph *glyph;
230 struct AVTreeNode *node = NULL;
231 int ret;
232
233 /* load glyph into dtext->face->glyph */
234 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
235 return AVERROR(EINVAL);
236
237 /* save glyph */
238 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
239 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
240 ret = AVERROR(ENOMEM);
241 goto error;
242 }
243 glyph->code = code;
244
245 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
246 ret = AVERROR(EINVAL);
247 goto error;
248 }
249
250 glyph->bitmap = dtext->face->glyph->bitmap;
251 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
252 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
253 glyph->advance = dtext->face->glyph->advance.x >> 6;
254
255 /* measure text height to calculate text_height (or the maximum text height) */
256 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
257
258 /* cache the newly created glyph */
259 if (!(node = av_mallocz(av_tree_node_size))) {
260 ret = AVERROR(ENOMEM);
261 goto error;
262 }
263 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
264
265 if (glyph_ptr)
266 *glyph_ptr = glyph;
267 return 0;
268
269 error:
270 if (glyph)
271 av_freep(&glyph->glyph);
272 av_freep(&glyph);
273 av_freep(&node);
274 return ret;
275 }
276
277 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
278 {
279 int err;
280 DrawTextContext *dtext = ctx->priv;
281 Glyph *glyph;
282
283 dtext->class = &drawtext_class;
284 av_opt_set_defaults(dtext);
285 dtext->fontcolor_string = av_strdup("black");
286 dtext->boxcolor_string = av_strdup("white");
287 dtext->shadowcolor_string = av_strdup("black");
288
289 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
290 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
291 return err;
292 }
293
294 if (!dtext->fontfile) {
295 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
296 return AVERROR(EINVAL);
297 }
298
299 if (dtext->textfile) {
300 uint8_t *textbuf;
301 size_t textbuf_size;
302
303 if (dtext->text) {
304 av_log(ctx, AV_LOG_ERROR,
305 "Both text and text file provided. Please provide only one\n");
306 return AVERROR(EINVAL);
307 }
308 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
309 av_log(ctx, AV_LOG_ERROR,
310 "The text file '%s' could not be read or is empty\n",
311 dtext->textfile);
312 return err;
313 }
314
315 if (!(dtext->text = av_malloc(textbuf_size+1)))
316 return AVERROR(ENOMEM);
317 memcpy(dtext->text, textbuf, textbuf_size);
318 dtext->text[textbuf_size] = 0;
319 av_file_unmap(textbuf, textbuf_size);
320 }
321
322 if (!dtext->text) {
323 av_log(ctx, AV_LOG_ERROR,
324 "Either text or a valid file must be provided\n");
325 return AVERROR(EINVAL);
326 }
327
328 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
329 av_log(ctx, AV_LOG_ERROR,
330 "Invalid font color '%s'\n", dtext->fontcolor_string);
331 return err;
332 }
333
334 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
335 av_log(ctx, AV_LOG_ERROR,
336 "Invalid box color '%s'\n", dtext->boxcolor_string);
337 return err;
338 }
339
340 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
341 av_log(ctx, AV_LOG_ERROR,
342 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
343 return err;
344 }
345
346 if ((err = FT_Init_FreeType(&(dtext->library)))) {
347 av_log(ctx, AV_LOG_ERROR,
348 "Could not load FreeType: %s\n", FT_ERRMSG(err));
349 return AVERROR(EINVAL);
350 }
351
352 /* load the face, and set up the encoding, which is by default UTF-8 */
353 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
354 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
355 dtext->fontfile, FT_ERRMSG(err));
356 return AVERROR(EINVAL);
357 }
358 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
359 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
360 dtext->fontsize, FT_ERRMSG(err));
361 return AVERROR(EINVAL);
362 }
363
364 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
365
366 /* load the fallback glyph with code 0 */
367 load_glyph(ctx, NULL, 0);
368
369 /* set the tabsize in pixels */
370 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
371 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
372 return err;
373 }
374 dtext->tabsize *= glyph->advance;
375
376 #if !HAVE_LOCALTIME_R
377 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
378 #endif
379
380 return 0;
381 }
382
383 static int query_formats(AVFilterContext *ctx)
384 {
385 static const enum PixelFormat pix_fmts[] = {
386 PIX_FMT_ARGB, PIX_FMT_RGBA,
387 PIX_FMT_ABGR, PIX_FMT_BGRA,
388 PIX_FMT_RGB24, PIX_FMT_BGR24,
389 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
390 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
391 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
392 PIX_FMT_NONE
393 };
394
395 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
396 return 0;
397 }
398
399 static int glyph_enu_free(void *opaque, void *elem)
400 {
401 av_free(elem);
402 return 0;
403 }
404
405 static av_cold void uninit(AVFilterContext *ctx)
406 {
407 DrawTextContext *dtext = ctx->priv;
408 int i;
409
410 av_freep(&dtext->fontfile);
411 av_freep(&dtext->text);
412 av_freep(&dtext->expanded_text);
413 av_freep(&dtext->fontcolor_string);
414 av_freep(&dtext->boxcolor_string);
415 av_freep(&dtext->positions);
416 av_freep(&dtext->shadowcolor_string);
417 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
418 av_tree_destroy(dtext->glyphs);
419 dtext->glyphs = 0;
420 FT_Done_Face(dtext->face);
421 FT_Done_FreeType(dtext->library);
422
423 for (i = 0; i < 4; i++) {
424 av_freep(&dtext->box_line[i]);
425 dtext->pixel_step[i] = 0;
426 }
427
428 }
429
430 static inline int is_newline(uint32_t c)
431 {
432 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
433 }
434
435 static int dtext_prepare_text(AVFilterContext *ctx)
436 {
437 DrawTextContext *dtext = ctx->priv;
438 uint32_t code = 0, prev_code = 0;
439 int x = 0, y = 0, i = 0, ret;
440 int text_height, baseline;
441 char *text = dtext->text;
442 uint8_t *p;
443 int str_w = 0, len;
444 int y_min = 32000, y_max = -32000;
445 FT_Vector delta;
446 Glyph *glyph = NULL, *prev_glyph = NULL;
447 Glyph dummy = { 0 };
448 int width = ctx->inputs[0]->w;
449 int height = ctx->inputs[0]->h;
450
451 #if HAVE_LOCALTIME_R
452 time_t now = time(0);
453 struct tm ltime;
454 uint8_t *buf = dtext->expanded_text;
455 int buf_size = dtext->expanded_text_size;
456
457 if (!buf)
458 buf_size = 2*strlen(dtext->text)+1;
459
460 localtime_r(&now, &ltime);
461
462 while ((buf = av_realloc(buf, buf_size))) {
463 *buf = 1;
464 if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)
465 break;
466 buf_size *= 2;
467 }
468
469 if (!buf)
470 return AVERROR(ENOMEM);
471 text = dtext->expanded_text = buf;
472 dtext->expanded_text_size = buf_size;
473 #endif
474
475 if ((len = strlen(text)) > dtext->nb_positions) {
476 FT_Vector *p = av_realloc(dtext->positions,
477 len * sizeof(*dtext->positions));
478 if (!p) {
479 av_freep(dtext->positions);
480 dtext->nb_positions = 0;
481 return AVERROR(ENOMEM);
482 } else {
483 dtext->positions = p;
484 dtext->nb_positions = len;
485 }
486 }
487
488 /* load and cache glyphs */
489 for (i = 0, p = text; *p; i++) {
490 GET_UTF8(code, *p++, continue;);
491
492 /* get glyph */
493 dummy.code = code;
494 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
495 if (!glyph) {
496 ret = load_glyph(ctx, &glyph, code);
497 if (ret)
498 return ret;
499 }
500
501 y_min = FFMIN(glyph->bbox.yMin, y_min);
502 y_max = FFMAX(glyph->bbox.yMax, y_max);
503 }
504 text_height = y_max - y_min;
505 baseline = y_max;
506
507 /* compute and save position for each glyph */
508 glyph = NULL;
509 for (i = 0, p = text; *p; i++) {
510 GET_UTF8(code, *p++, continue;);
511
512 /* skip the \n in the sequence \r\n */
513 if (prev_code == '\r' && code == '\n')
514 continue;
515
516 prev_code = code;
517 if (is_newline(code)) {
518 str_w = FFMAX(str_w, x - dtext->x);
519 y += text_height;
520 x = 0;
521 continue;
522 }
523
524 /* get glyph */
525 prev_glyph = glyph;
526 dummy.code = code;
527 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
528
529 /* kerning */
530 if (dtext->use_kerning && prev_glyph && glyph->code) {
531 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
532 ft_kerning_default, &delta);
533 x += delta.x >> 6;
534 }
535
536 if (x + glyph->bbox.xMax >= width) {
537 str_w = FFMAX(str_w, x);
538 y += text_height;
539 x = 0;
540 }
541
542 /* save position */
543 dtext->positions[i].x = x + glyph->bitmap_left;
544 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
545 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
546 else x += glyph->advance;
547 }
548
549 str_w = FFMIN(width - 1, FFMAX(str_w, x));
550 y = FFMIN(y + text_height, height - 1);
551
552 dtext->w = str_w;
553 dtext->var_values[VAR_TEXT_W] = dtext->var_values[VAR_TW] = dtext->w;
554 dtext->h = y;
555 dtext->var_values[VAR_TEXT_H] = dtext->var_values[VAR_TH] = dtext->h;
556
557 return 0;
558 }
559
560
561 static int config_input(AVFilterLink *inlink)
562 {
563 AVFilterContext *ctx = inlink->dst;
564 DrawTextContext *dtext = ctx->priv;
565 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
566 int ret;
567
568 dtext->hsub = pix_desc->log2_chroma_w;
569 dtext->vsub = pix_desc->log2_chroma_h;
570
571 dtext->var_values[VAR_E ] = M_E;
572 dtext->var_values[VAR_PHI] = M_PHI;
573 dtext->var_values[VAR_PI ] = M_PI;
574
575 dtext->var_values[VAR_MAIN_W] =
576 dtext->var_values[VAR_MW] = ctx->inputs[0]->w;
577 dtext->var_values[VAR_MAIN_H] =
578 dtext->var_values[VAR_MH] = ctx->inputs[0]->h;
579
580 dtext->var_values[VAR_X] = 0;
581 dtext->var_values[VAR_Y] = 0;
582 dtext->var_values[VAR_N] = 0;
583 dtext->var_values[VAR_T] = NAN;
584
585 av_lfg_init(&dtext->prng, av_get_random_seed());
586
587 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
588 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
589 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
590 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
591 (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
592 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
593 return AVERROR(EINVAL);
594
595 if ((ret =
596 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
597 inlink->w, dtext->boxcolor,
598 inlink->format, dtext->boxcolor_rgba,
599 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
600 return ret;
601
602 if (!dtext->is_packed_rgb) {
603 uint8_t *rgba = dtext->fontcolor_rgba;
604 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
605 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
606 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
607 dtext->fontcolor[3] = rgba[3];
608 rgba = dtext->shadowcolor_rgba;
609 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
610 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
611 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
612 dtext->shadowcolor[3] = rgba[3];
613 }
614
615 dtext->draw = 1;
616
617 return dtext_prepare_text(ctx);
618 }
619
620 #define GET_BITMAP_VAL(r, c) \
621 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
622 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
623 bitmap->buffer[(r) * bitmap->pitch + (c)]
624
625 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
626 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
627 alpha = yuva_color[3] * (val) * 129; \
628 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
629 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
630 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
631 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
632 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
633 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
634 }\
635 }
636
637 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
638 unsigned int y, unsigned int width, unsigned int height,
639 const uint8_t yuva_color[4], int hsub, int vsub)
640 {
641 int r, c, alpha;
642 unsigned int luma_pos, chroma_pos1, chroma_pos2;
643 uint8_t src_val;
644
645 for (r = 0; r < bitmap->rows && r+y < height; r++) {
646 for (c = 0; c < bitmap->width && c+x < width; c++) {
647 /* get intensity value in the glyph bitmap (source) */
648 src_val = GET_BITMAP_VAL(r, c);
649 if (!src_val)
650 continue;
651
652 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
653 }
654 }
655
656 return 0;
657 }
658
659 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
660 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
661 alpha = rgba_color[3] * (val) * 129; \
662 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
663 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
664 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
665 }
666
667 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
668 unsigned int x, unsigned int y,
669 unsigned int width, unsigned int height, int pixel_step,
670 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
671 {
672 int r, c, alpha;
673 uint8_t *p;
674 uint8_t src_val;
675
676 for (r = 0; r < bitmap->rows && r+y < height; r++) {
677 for (c = 0; c < bitmap->width && c+x < width; c++) {
678 /* get intensity value in the glyph bitmap (source) */
679 src_val = GET_BITMAP_VAL(r, c);
680 if (!src_val)
681 continue;
682
683 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
684 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
685 }
686 }
687
688 return 0;
689 }
690
691 static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
692 unsigned int width, unsigned int height,
693 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
694 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
695 {
696 int i, j, alpha;
697
698 if (color[3] != 0xFF) {
699 if (is_rgba_packed) {
700 uint8_t *p;
701 for (j = 0; j < height; j++)
702 for (i = 0; i < width; i++)
703 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
704 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
705 } else {
706 unsigned int luma_pos, chroma_pos1, chroma_pos2;
707 for (j = 0; j < height; j++)
708 for (i = 0; i < width; i++)
709 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
710 }
711 } else {
712 ff_draw_rectangle(picref->data, picref->linesize,
713 line, pixel_step, hsub, vsub,
714 x, y, width, height);
715 }
716 }
717
718 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
719 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
720 {
721 char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;
722 uint32_t code = 0;
723 int i;
724 uint8_t *p;
725 Glyph *glyph = NULL;
726
727 for (i = 0, p = text; *p; i++) {
728 Glyph dummy = { 0 };
729 GET_UTF8(code, *p++, continue;);
730
731 /* skip new line chars, just go to new line */
732 if (code == '\n' || code == '\r' || code == '\t')
733 continue;
734
735 dummy.code = code;
736 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
737
738 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
739 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
740 return AVERROR(EINVAL);
741
742 if (dtext->is_packed_rgb) {
743 draw_glyph_rgb(picref, &glyph->bitmap,
744 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
745 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
746 } else {
747 draw_glyph_yuv(picref, &glyph->bitmap,
748 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
749 yuvcolor, dtext->hsub, dtext->vsub);
750 }
751 }
752
753 return 0;
754 }
755
756 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
757 int width, int height)
758 {
759 DrawTextContext *dtext = ctx->priv;
760 int ret;
761
762 /* draw box */
763 if (dtext->draw_box)
764 drawbox(picref, dtext->x, dtext->y, dtext->w, dtext->h,
765 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
766 dtext->hsub, dtext->vsub, dtext->is_packed_rgb,
767 dtext->rgba_map);
768
769 if (dtext->shadowx || dtext->shadowy) {
770 if ((ret = draw_glyphs(dtext, picref, width, height,
771 dtext->shadowcolor_rgba,
772 dtext->shadowcolor,
773 dtext->x + dtext->shadowx,
774 dtext->y + dtext->shadowy)) < 0)
775 return ret;
776 }
777
778 if ((ret = draw_glyphs(dtext, picref, width, height,
779 dtext->fontcolor_rgba,
780 dtext->fontcolor,
781 dtext->x,
782 dtext->y)) < 0)
783 return ret;
784
785 return 0;
786 }
787
788 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
789
790 static inline int normalize_double(int *n, double d)
791 {
792 int ret = 0;
793
794 if (isnan(d)) {
795 ret = AVERROR(EINVAL);
796 } else if (d > INT_MAX || d < INT_MIN) {
797 *n = d > INT_MAX ? INT_MAX : INT_MIN;
798 ret = AVERROR(EINVAL);
799 } else
800 *n = round(d);
801
802 return ret;
803 }
804
805 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
806 {
807 AVFilterContext *ctx = inlink->dst;
808 DrawTextContext *dtext = ctx->priv;
809 int fail = 0;
810
811 if (dtext_prepare_text(ctx) < 0) {
812 av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
813 fail = 1;
814 }
815
816 dtext->var_values[VAR_T] = inpicref->pts == AV_NOPTS_VALUE ?
817 NAN : inpicref->pts * av_q2d(inlink->time_base);
818 dtext->var_values[VAR_X] =
819 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
820 dtext->var_values[VAR_Y] =
821 av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
822 dtext->var_values[VAR_X] =
823 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
824
825 dtext->draw = fail ? 0 :
826 av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
827
828 normalize_double(&dtext->x, dtext->var_values[VAR_X]);
829 normalize_double(&dtext->y, dtext->var_values[VAR_Y]);
830
831 if (dtext->x < 0) dtext->x = 0;
832 if (dtext->y < 0) dtext->y = 0;
833 if ((unsigned)dtext->x + (unsigned)dtext->w > inlink->w)
834 dtext->x = inlink->w - dtext->w;
835 if ((unsigned)dtext->y + (unsigned)dtext->h > inlink->h)
836 dtext->y = inlink->h - dtext->h;
837
838 dtext->x &= ~((1 << dtext->hsub) - 1);
839 dtext->y &= ~((1 << dtext->vsub) - 1);
840
841 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
842 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
843 dtext->x, dtext->y, dtext->x+dtext->w, dtext->y+dtext->h);
844
845 avfilter_start_frame(inlink->dst->outputs[0], inpicref);
846 }
847
848 static void end_frame(AVFilterLink *inlink)
849 {
850 AVFilterLink *outlink = inlink->dst->outputs[0];
851 AVFilterBufferRef *picref = inlink->cur_buf;
852 DrawTextContext *dtext = inlink->dst->priv;
853
854 if (dtext->draw)
855 draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
856
857 dtext->var_values[VAR_N] += 1.0;
858
859 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
860 avfilter_end_frame(outlink);
861 }
862
863 AVFilter avfilter_vf_drawtext = {
864 .name = "drawtext",
865 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
866 .priv_size = sizeof(DrawTextContext),
867 .init = init,
868 .uninit = uninit,
869 .query_formats = query_formats,
870
871 .inputs = (AVFilterPad[]) {{ .name = "default",
872 .type = AVMEDIA_TYPE_VIDEO,
873 .get_video_buffer = avfilter_null_get_video_buffer,
874 .start_frame = start_frame,
875 .draw_slice = null_draw_slice,
876 .end_frame = end_frame,
877 .config_props = config_input,
878 .min_perms = AV_PERM_WRITE |
879 AV_PERM_READ,
880 .rej_perms = AV_PERM_PRESERVE },
881 { .name = NULL}},
882 .outputs = (AVFilterPad[]) {{ .name = "default",
883 .type = AVMEDIA_TYPE_VIDEO, },
884 { .name = NULL}},
885 };