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>
6 * This file is part of Libav.
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.
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.
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
25 * drawtext filter, based on the original vhook/drawtext.c
26 * filter by Gustavo Sverzut Barbieri
31 #include <sys/types.h>
37 #if CONFIG_LIBFONTCONFIG
38 #include <fontconfig/fontconfig.h>
41 #include "libavutil/colorspace.h"
42 #include "libavutil/common.h"
43 #include "libavutil/file.h"
44 #include "libavutil/eval.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/mathematics.h"
47 #include "libavutil/random_seed.h"
48 #include "libavutil/parseutils.h"
49 #include "libavutil/pixdesc.h"
50 #include "libavutil/tree.h"
51 #include "libavutil/lfg.h"
53 #include "drawutils.h"
59 #include FT_FREETYPE_H
62 static const char *const var_names[] = {
66 "main_w", "W", ///< width of the main video
67 "main_h", "H", ///< height of the main video
68 "text_w", "w", ///< width of the overlay text
69 "text_h", "h", ///< height of the overlay text
72 "n", ///< number of processed frames
73 "t", ///< timestamp expressed in seconds
77 static const char *const fun2_names[] = {
81 static double drand(void *opaque, double min, double max)
83 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
86 typedef double (*eval_func2)(void *, double a, double b);
88 static const eval_func2 fun2[] = {
108 typedef struct DrawTextContext {
109 const AVClass *class;
110 #if CONFIG_LIBFONTCONFIG
111 uint8_t *font; ///< font to be used
113 uint8_t *fontfile; ///< font to be used
114 uint8_t *text; ///< text to be drawn
115 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
116 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
117 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
118 FT_Vector *positions; ///< positions for each element in the text
119 size_t nb_positions; ///< number of elements of positions array
120 char *textfile; ///< file with text to be drawn
121 int x, y; ///< position to start drawing text
122 int w, h; ///< dimension of the text block
123 int shadowx, shadowy;
124 unsigned int fontsize; ///< font size to use
125 char *fontcolor_string; ///< font color as string
126 char *boxcolor_string; ///< box color as string
127 char *shadowcolor_string; ///< shadow color as string
128 uint8_t fontcolor[4]; ///< foreground color
129 uint8_t boxcolor[4]; ///< background color
130 uint8_t shadowcolor[4]; ///< shadow color
131 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
132 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
133 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
135 short int draw_box; ///< draw box around text - true or false
136 int use_kerning; ///< font kerning is used - true/false
137 int tabsize; ///< tab size
138 int fix_bounds; ///< do we let it go out of frame bounds - t/f
140 FT_Library library; ///< freetype font library handle
141 FT_Face face; ///< freetype font face handle
142 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
143 int hsub, vsub; ///< chroma subsampling values
145 int pixel_step[4]; ///< distance in bytes between the component of each pixel
146 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
147 uint8_t *box_line[4]; ///< line used for filling the box background
148 char *x_expr, *y_expr;
149 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
150 double var_values[VAR_VARS_NB];
153 int draw; ///< set to zero to prevent drawing
154 AVLFG prng; ///< random
157 #define OFFSET(x) offsetof(DrawTextContext, x)
158 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
160 static const AVOption drawtext_options[]= {
161 #if CONFIG_LIBFONTCONFIG
162 { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
164 { "fontfile", NULL, OFFSET(fontfile), AV_OPT_TYPE_STRING, .flags = FLAGS },
165 { "text", NULL, OFFSET(text), AV_OPT_TYPE_STRING, .flags = FLAGS },
166 { "textfile", NULL, OFFSET(textfile), AV_OPT_TYPE_STRING, .flags = FLAGS },
167 { "fontcolor", NULL, OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
168 { "boxcolor", NULL, OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, { .str = "white" }, .flags = FLAGS },
169 { "shadowcolor", NULL, OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
170 { "box", NULL, OFFSET(draw_box), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
171 { "fontsize", NULL, OFFSET(fontsize), AV_OPT_TYPE_INT, { .i64 = 16 }, 1, 72, FLAGS },
172 { "x", NULL, OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
173 { "y", NULL, OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
174 { "shadowx", NULL, OFFSET(shadowx), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
175 { "shadowy", NULL, OFFSET(shadowy), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
176 { "tabsize", NULL, OFFSET(tabsize), AV_OPT_TYPE_INT, { .i64 = 4 }, 0, INT_MAX, FLAGS },
177 { "draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
178 { "fix_bounds", "if true, check and fix text coords to avoid clipping",
179 OFFSET(fix_bounds), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS },
181 /* FT_LOAD_* flags */
182 { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" },
183 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
184 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
185 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
186 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
187 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
188 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
189 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
190 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
191 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
192 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
193 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
194 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
195 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
196 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
197 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
201 static const char *drawtext_get_name(void *ctx)
206 static const AVClass drawtext_class = {
212 #undef __FTERRORS_H__
213 #define FT_ERROR_START_LIST {
214 #define FT_ERRORDEF(e, v, s) { (e), (s) },
215 #define FT_ERROR_END_LIST { 0, NULL } };
221 } static ft_errors[] =
224 #define FT_ERRMSG(e) ft_errors[e].err_msg
226 typedef struct Glyph {
229 FT_Bitmap bitmap; ///< array holding bitmaps of font
236 static int glyph_cmp(void *key, const void *b)
238 const Glyph *a = key, *bb = b;
239 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
240 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
244 * Load glyphs corresponding to the UTF-32 codepoint code.
246 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
248 DrawTextContext *s = ctx->priv;
250 struct AVTreeNode *node = NULL;
253 /* load glyph into s->face->glyph */
254 if (FT_Load_Char(s->face, code, s->ft_load_flags))
255 return AVERROR(EINVAL);
258 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
259 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
260 ret = AVERROR(ENOMEM);
265 if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
266 ret = AVERROR(EINVAL);
270 glyph->bitmap = s->face->glyph->bitmap;
271 glyph->bitmap_left = s->face->glyph->bitmap_left;
272 glyph->bitmap_top = s->face->glyph->bitmap_top;
273 glyph->advance = s->face->glyph->advance.x >> 6;
275 /* measure text height to calculate text_height (or the maximum text height) */
276 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
278 /* cache the newly created glyph */
279 if (!(node = av_tree_node_alloc())) {
280 ret = AVERROR(ENOMEM);
283 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
291 av_freep(&glyph->glyph);
297 static int parse_font(AVFilterContext *ctx)
299 DrawTextContext *s = ctx->priv;
300 #if !CONFIG_LIBFONTCONFIG
302 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
303 return AVERROR(EINVAL);
308 FcPattern *pat, *best;
309 FcResult result = FcResultMatch;
313 int err = AVERROR(ENOENT);
319 return AVERROR_UNKNOWN;
321 if (!(pat = FcPatternCreate()))
322 return AVERROR(ENOMEM);
324 FcPatternAddString(pat, FC_FAMILY, s->font);
325 FcPatternAddBool(pat, FC_OUTLINE, FcTrue);
326 FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
328 FcDefaultSubstitute(pat);
330 if (!FcConfigSubstitute(NULL, pat, FcMatchPattern)) {
331 FcPatternDestroy(pat);
332 return AVERROR(ENOMEM);
335 best = FcFontMatch(NULL, pat, &result);
336 FcPatternDestroy(pat);
338 if (!best || result == FcResultNoMatch) {
339 av_log(ctx, AV_LOG_ERROR,
340 "Cannot find a valid font for the family %s\n",
345 if (FcPatternGetBool(best, FC_OUTLINE, 0, &fc_bool) != FcResultMatch ||
347 av_log(ctx, AV_LOG_ERROR, "Outline not available for %s\n",
352 if (FcPatternGetString(best, FC_FAMILY, 0, &fc_string) != FcResultMatch) {
353 av_log(ctx, AV_LOG_ERROR, "No matches for %s\n",
358 if (FcPatternGetString(best, FC_FILE, 0, &fc_string) != FcResultMatch) {
359 av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
364 s->fontfile = av_strdup(fc_string);
366 err = AVERROR(ENOMEM);
371 FcPatternDestroy(best);
376 static av_cold int init(AVFilterContext *ctx)
379 DrawTextContext *s = ctx->priv;
382 if ((err = parse_font(ctx)) < 0)
390 av_log(ctx, AV_LOG_ERROR,
391 "Both text and text file provided. Please provide only one\n");
392 return AVERROR(EINVAL);
394 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
395 av_log(ctx, AV_LOG_ERROR,
396 "The text file '%s' could not be read or is empty\n",
401 if (!(s->text = av_malloc(textbuf_size+1)))
402 return AVERROR(ENOMEM);
403 memcpy(s->text, textbuf, textbuf_size);
404 s->text[textbuf_size] = 0;
405 av_file_unmap(textbuf, textbuf_size);
409 av_log(ctx, AV_LOG_ERROR,
410 "Either text or a valid file must be provided\n");
411 return AVERROR(EINVAL);
414 if ((err = av_parse_color(s->fontcolor_rgba, s->fontcolor_string, -1, ctx))) {
415 av_log(ctx, AV_LOG_ERROR,
416 "Invalid font color '%s'\n", s->fontcolor_string);
420 if ((err = av_parse_color(s->boxcolor_rgba, s->boxcolor_string, -1, ctx))) {
421 av_log(ctx, AV_LOG_ERROR,
422 "Invalid box color '%s'\n", s->boxcolor_string);
426 if ((err = av_parse_color(s->shadowcolor_rgba, s->shadowcolor_string, -1, ctx))) {
427 av_log(ctx, AV_LOG_ERROR,
428 "Invalid shadow color '%s'\n", s->shadowcolor_string);
432 if ((err = FT_Init_FreeType(&(s->library)))) {
433 av_log(ctx, AV_LOG_ERROR,
434 "Could not load FreeType: %s\n", FT_ERRMSG(err));
435 return AVERROR(EINVAL);
438 /* load the face, and set up the encoding, which is by default UTF-8 */
439 if ((err = FT_New_Face(s->library, s->fontfile, 0, &s->face))) {
440 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
441 s->fontfile, FT_ERRMSG(err));
442 return AVERROR(EINVAL);
444 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
445 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
446 s->fontsize, FT_ERRMSG(err));
447 return AVERROR(EINVAL);
450 s->use_kerning = FT_HAS_KERNING(s->face);
452 /* load the fallback glyph with code 0 */
453 load_glyph(ctx, NULL, 0);
455 /* set the tabsize in pixels */
456 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
457 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
460 s->tabsize *= glyph->advance;
462 #if !HAVE_LOCALTIME_R
463 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
469 static int query_formats(AVFilterContext *ctx)
471 static const enum AVPixelFormat pix_fmts[] = {
472 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
473 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
474 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
475 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,
476 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
477 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
481 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
485 static int glyph_enu_free(void *opaque, void *elem)
491 static av_cold void uninit(AVFilterContext *ctx)
493 DrawTextContext *s = ctx->priv;
496 av_expr_free(s->x_pexpr);
497 av_expr_free(s->y_pexpr);
498 av_expr_free(s->d_pexpr);
499 s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;
500 av_freep(&s->expanded_text);
501 av_freep(&s->positions);
502 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
503 av_tree_destroy(s->glyphs);
505 FT_Done_Face(s->face);
506 FT_Done_FreeType(s->library);
508 for (i = 0; i < 4; i++) {
509 av_freep(&s->box_line[i]);
510 s->pixel_step[i] = 0;
515 static inline int is_newline(uint32_t c)
517 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
520 static int dtext_prepare_text(AVFilterContext *ctx)
522 DrawTextContext *s = ctx->priv;
523 uint32_t code = 0, prev_code = 0;
524 int x = 0, y = 0, i = 0, ret;
525 int text_height, baseline;
526 char *text = s->text;
529 int y_min = 32000, y_max = -32000;
531 Glyph *glyph = NULL, *prev_glyph = NULL;
533 int width = ctx->inputs[0]->w;
534 int height = ctx->inputs[0]->h;
537 time_t now = time(0);
539 uint8_t *buf = s->expanded_text;
540 int buf_size = s->expanded_text_size;
543 buf_size = 2*strlen(s->text)+1;
545 localtime_r(&now, <ime);
547 while ((buf = av_realloc(buf, buf_size))) {
549 if (strftime(buf, buf_size, s->text, <ime) != 0 || *buf == 0)
555 return AVERROR(ENOMEM);
556 text = s->expanded_text = buf;
557 s->expanded_text_size = buf_size;
560 if ((len = strlen(text)) > s->nb_positions) {
561 FT_Vector *p = av_realloc(s->positions,
562 len * sizeof(*s->positions));
564 av_freep(s->positions);
566 return AVERROR(ENOMEM);
569 s->nb_positions = len;
573 /* load and cache glyphs */
574 for (i = 0, p = text; *p; i++) {
575 GET_UTF8(code, *p++, continue;);
579 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
581 ret = load_glyph(ctx, &glyph, code);
586 y_min = FFMIN(glyph->bbox.yMin, y_min);
587 y_max = FFMAX(glyph->bbox.yMax, y_max);
589 text_height = y_max - y_min;
592 /* compute and save position for each glyph */
594 for (i = 0, p = text; *p; i++) {
595 GET_UTF8(code, *p++, continue;);
597 /* skip the \n in the sequence \r\n */
598 if (prev_code == '\r' && code == '\n')
602 if (is_newline(code)) {
603 str_w = FFMAX(str_w, x - s->x);
612 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
615 if (s->use_kerning && prev_glyph && glyph->code) {
616 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
617 ft_kerning_default, &delta);
621 if (x + glyph->bbox.xMax >= width) {
622 str_w = FFMAX(str_w, x);
628 s->positions[i].x = x + glyph->bitmap_left;
629 s->positions[i].y = y - glyph->bitmap_top + baseline;
630 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
631 else x += glyph->advance;
634 str_w = FFMIN(width - 1, FFMAX(str_w, x));
635 y = FFMIN(y + text_height, height - 1);
638 s->var_values[VAR_TEXT_W] = s->var_values[VAR_TW] = s->w;
640 s->var_values[VAR_TEXT_H] = s->var_values[VAR_TH] = s->h;
646 static int config_input(AVFilterLink *inlink)
648 AVFilterContext *ctx = inlink->dst;
649 DrawTextContext *s = ctx->priv;
650 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
653 s->hsub = pix_desc->log2_chroma_w;
654 s->vsub = pix_desc->log2_chroma_h;
656 s->var_values[VAR_E ] = M_E;
657 s->var_values[VAR_PHI] = M_PHI;
658 s->var_values[VAR_PI ] = M_PI;
660 s->var_values[VAR_MAIN_W] =
661 s->var_values[VAR_MW] = ctx->inputs[0]->w;
662 s->var_values[VAR_MAIN_H] =
663 s->var_values[VAR_MH] = ctx->inputs[0]->h;
665 s->var_values[VAR_X] = 0;
666 s->var_values[VAR_Y] = 0;
667 s->var_values[VAR_T] = NAN;
669 av_lfg_init(&s->prng, av_get_random_seed());
671 av_expr_free(s->x_pexpr);
672 av_expr_free(s->y_pexpr);
673 av_expr_free(s->d_pexpr);
674 s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;
675 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
676 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
677 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
678 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
679 (ret = av_expr_parse(&s->d_pexpr, s->d_expr, var_names,
680 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
681 return AVERROR(EINVAL);
684 ff_fill_line_with_color(s->box_line, s->pixel_step,
685 inlink->w, s->boxcolor,
686 inlink->format, s->boxcolor_rgba,
687 &s->is_packed_rgb, s->rgba_map)) < 0)
690 if (!s->is_packed_rgb) {
691 uint8_t *rgba = s->fontcolor_rgba;
692 s->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
693 s->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
694 s->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
695 s->fontcolor[3] = rgba[3];
696 rgba = s->shadowcolor_rgba;
697 s->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
698 s->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
699 s->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
700 s->shadowcolor[3] = rgba[3];
705 return dtext_prepare_text(ctx);
708 #define GET_BITMAP_VAL(r, c) \
709 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
710 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
711 bitmap->buffer[(r) * bitmap->pitch + (c)]
713 #define SET_PIXEL_YUV(frame, yuva_color, val, x, y, hsub, vsub) { \
714 luma_pos = ((x) ) + ((y) ) * frame->linesize[0]; \
715 alpha = yuva_color[3] * (val) * 129; \
716 frame->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * frame->data[0][luma_pos] ) >> 23; \
717 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
718 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[1]; \
719 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[2]; \
720 frame->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * frame->data[1][chroma_pos1]) >> 23; \
721 frame->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * frame->data[2][chroma_pos2]) >> 23; \
725 static inline int draw_glyph_yuv(AVFrame *frame, FT_Bitmap *bitmap, unsigned int x,
726 unsigned int y, unsigned int width, unsigned int height,
727 const uint8_t yuva_color[4], int hsub, int vsub)
730 unsigned int luma_pos, chroma_pos1, chroma_pos2;
733 for (r = 0; r < bitmap->rows && r+y < height; r++) {
734 for (c = 0; c < bitmap->width && c+x < width; c++) {
735 /* get intensity value in the glyph bitmap (source) */
736 src_val = GET_BITMAP_VAL(r, c);
740 SET_PIXEL_YUV(frame, yuva_color, src_val, c+x, y+r, hsub, vsub);
747 #define SET_PIXEL_RGB(frame, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
748 p = frame->data[0] + (x) * pixel_step + ((y) * frame->linesize[0]); \
749 alpha = rgba_color[3] * (val) * 129; \
750 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
751 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
752 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
755 static inline int draw_glyph_rgb(AVFrame *frame, FT_Bitmap *bitmap,
756 unsigned int x, unsigned int y,
757 unsigned int width, unsigned int height, int pixel_step,
758 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
764 for (r = 0; r < bitmap->rows && r+y < height; r++) {
765 for (c = 0; c < bitmap->width && c+x < width; c++) {
766 /* get intensity value in the glyph bitmap (source) */
767 src_val = GET_BITMAP_VAL(r, c);
771 SET_PIXEL_RGB(frame, rgba_color, src_val, c+x, y+r, pixel_step,
772 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
779 static inline void drawbox(AVFrame *frame, unsigned int x, unsigned int y,
780 unsigned int width, unsigned int height,
781 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
782 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
786 if (color[3] != 0xFF) {
787 if (is_rgba_packed) {
789 for (j = 0; j < height; j++)
790 for (i = 0; i < width; i++)
791 SET_PIXEL_RGB(frame, color, 255, i+x, y+j, pixel_step[0],
792 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
794 unsigned int luma_pos, chroma_pos1, chroma_pos2;
795 for (j = 0; j < height; j++)
796 for (i = 0; i < width; i++)
797 SET_PIXEL_YUV(frame, color, 255, i+x, y+j, hsub, vsub);
800 ff_draw_rectangle(frame->data, frame->linesize,
801 line, pixel_step, hsub, vsub,
802 x, y, width, height);
806 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
807 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
809 char *text = HAVE_LOCALTIME_R ? s->expanded_text : s->text;
815 for (i = 0, p = text; *p; i++) {
817 GET_UTF8(code, *p++, continue;);
819 /* skip new line chars, just go to new line */
820 if (code == '\n' || code == '\r' || code == '\t')
824 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
826 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
827 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
828 return AVERROR(EINVAL);
830 if (s->is_packed_rgb) {
831 draw_glyph_rgb(frame, &glyph->bitmap,
832 s->positions[i].x+x, s->positions[i].y+y, width, height,
833 s->pixel_step[0], rgbcolor, s->rgba_map);
835 draw_glyph_yuv(frame, &glyph->bitmap,
836 s->positions[i].x+x, s->positions[i].y+y, width, height,
837 yuvcolor, s->hsub, s->vsub);
844 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
845 int width, int height)
847 DrawTextContext *s = ctx->priv;
852 drawbox(frame, s->x, s->y, s->w, s->h,
853 s->box_line, s->pixel_step, s->boxcolor,
854 s->hsub, s->vsub, s->is_packed_rgb,
857 if (s->shadowx || s->shadowy) {
858 if ((ret = draw_glyphs(s, frame, width, height,
862 s->y + s->shadowy)) < 0)
866 if ((ret = draw_glyphs(s, frame, width, height,
876 static inline int normalize_double(int *n, double d)
881 ret = AVERROR(EINVAL);
882 } else if (d > INT_MAX || d < INT_MIN) {
883 *n = d > INT_MAX ? INT_MAX : INT_MIN;
884 ret = AVERROR(EINVAL);
891 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
893 AVFilterContext *ctx = inlink->dst;
894 DrawTextContext *s = ctx->priv;
897 if ((ret = dtext_prepare_text(ctx)) < 0) {
898 av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
899 av_frame_free(&frame);
903 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
904 NAN : frame->pts * av_q2d(inlink->time_base);
905 s->var_values[VAR_X] =
906 av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
907 s->var_values[VAR_Y] =
908 av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
909 s->var_values[VAR_X] =
910 av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
912 s->draw = av_expr_eval(s->d_pexpr, s->var_values, &s->prng);
914 normalize_double(&s->x, s->var_values[VAR_X]);
915 normalize_double(&s->y, s->var_values[VAR_Y]);
918 if (s->x < 0) s->x = 0;
919 if (s->y < 0) s->y = 0;
920 if ((unsigned)s->x + (unsigned)s->w > inlink->w)
921 s->x = inlink->w - s->w;
922 if ((unsigned)s->y + (unsigned)s->h > inlink->h)
923 s->y = inlink->h - s->h;
926 s->x &= ~((1 << s->hsub) - 1);
927 s->y &= ~((1 << s->vsub) - 1);
929 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
930 (int)s->var_values[VAR_N], s->var_values[VAR_T],
931 s->x, s->y, s->x+s->w, s->y+s->h);
934 draw_text(inlink->dst, frame, frame->width, frame->height);
936 s->var_values[VAR_N] += 1.0;
938 return ff_filter_frame(inlink->dst->outputs[0], frame);
941 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
944 .type = AVMEDIA_TYPE_VIDEO,
945 .get_video_buffer = ff_null_get_video_buffer,
946 .filter_frame = filter_frame,
947 .config_props = config_input,
953 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
956 .type = AVMEDIA_TYPE_VIDEO,
961 AVFilter ff_vf_drawtext = {
963 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
964 .priv_size = sizeof(DrawTextContext),
965 .priv_class = &drawtext_class,
968 .query_formats = query_formats,
970 .inputs = avfilter_vf_drawtext_inputs,
971 .outputs = avfilter_vf_drawtext_outputs,