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
32 #include "libavutil/colorspace.h"
33 #include "libavutil/common.h"
34 #include "libavutil/file.h"
35 #include "libavutil/eval.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/random_seed.h"
39 #include "libavutil/parseutils.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/tree.h"
42 #include "libavutil/lfg.h"
44 #include "drawutils.h"
50 #include <freetype/config/ftheader.h>
51 #include FT_FREETYPE_H
54 static const char *const var_names[] = {
58 "main_w", "W", ///< width of the main video
59 "main_h", "H", ///< height of the main video
60 "text_w", "w", ///< width of the overlay text
61 "text_h", "h", ///< height of the overlay text
64 "n", ///< number of processed frames
65 "t", ///< timestamp expressed in seconds
69 static const char *const fun2_names[] = {
73 static double drand(void *opaque, double min, double max)
75 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
78 typedef double (*eval_func2)(void *, double a, double b);
80 static const eval_func2 fun2[] = {
101 const AVClass *class;
102 uint8_t *fontfile; ///< font to be used
103 uint8_t *text; ///< text to be drawn
104 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
105 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
106 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
107 FT_Vector *positions; ///< positions for each element in the text
108 size_t nb_positions; ///< number of elements of positions array
109 char *textfile; ///< file with text to be drawn
110 int x, y; ///< position to start drawing text
111 int w, h; ///< dimension of the text block
112 int shadowx, shadowy;
113 unsigned int fontsize; ///< font size to use
114 char *fontcolor_string; ///< font color as string
115 char *boxcolor_string; ///< box color as string
116 char *shadowcolor_string; ///< shadow color as string
117 uint8_t fontcolor[4]; ///< foreground color
118 uint8_t boxcolor[4]; ///< background color
119 uint8_t shadowcolor[4]; ///< shadow color
120 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
121 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
122 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
124 short int draw_box; ///< draw box around text - true or false
125 int use_kerning; ///< font kerning is used - true/false
126 int tabsize; ///< tab size
127 int fix_bounds; ///< do we let it go out of frame bounds - t/f
129 FT_Library library; ///< freetype font library handle
130 FT_Face face; ///< freetype font face handle
131 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
132 int hsub, vsub; ///< chroma subsampling values
134 int pixel_step[4]; ///< distance in bytes between the component of each pixel
135 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
136 uint8_t *box_line[4]; ///< line used for filling the box background
137 char *x_expr, *y_expr;
138 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
139 double var_values[VAR_VARS_NB];
142 int draw; ///< set to zero to prevent drawing
143 AVLFG prng; ///< random
146 #define OFFSET(x) offsetof(DrawTextContext, x)
147 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
149 static const AVOption drawtext_options[]= {
150 { "fontfile", NULL, OFFSET(fontfile), AV_OPT_TYPE_STRING, .flags = FLAGS },
151 { "text", NULL, OFFSET(text), AV_OPT_TYPE_STRING, .flags = FLAGS },
152 { "textfile", NULL, OFFSET(textfile), AV_OPT_TYPE_STRING, .flags = FLAGS },
153 { "fontcolor", NULL, OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
154 { "boxcolor", NULL, OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, { .str = "white" }, .flags = FLAGS },
155 { "shadowcolor", NULL, OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, { .str = "black" }, .flags = FLAGS },
156 { "box", NULL, OFFSET(draw_box), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
157 { "fontsize", NULL, OFFSET(fontsize), AV_OPT_TYPE_INT, { .i64 = 16 }, 1, 72, FLAGS },
158 { "x", NULL, OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
159 { "y", NULL, OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
160 { "shadowx", NULL, OFFSET(shadowx), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
161 { "shadowy", NULL, OFFSET(shadowy), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FLAGS },
162 { "tabsize", NULL, OFFSET(tabsize), AV_OPT_TYPE_INT, { .i64 = 4 }, 0, INT_MAX, FLAGS },
163 { "draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
164 { "fix_bounds", "if true, check and fix text coords to avoid clipping",
165 OFFSET(fix_bounds), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS },
167 /* FT_LOAD_* flags */
168 { "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" },
169 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
170 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
171 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
172 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
173 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
174 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
175 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
176 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
177 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
178 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
179 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
180 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
181 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
182 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
183 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
187 static const char *drawtext_get_name(void *ctx)
192 static const AVClass drawtext_class = {
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 } };
207 } static ft_errors[] =
210 #define FT_ERRMSG(e) ft_errors[e].err_msg
215 FT_Bitmap bitmap; ///< array holding bitmaps of font
222 static int glyph_cmp(void *key, const void *b)
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;
230 * Load glyphs corresponding to the UTF-32 codepoint code.
232 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
234 DrawTextContext *s = ctx->priv;
236 struct AVTreeNode *node = NULL;
239 /* load glyph into s->face->glyph */
240 if (FT_Load_Char(s->face, code, s->ft_load_flags))
241 return AVERROR(EINVAL);
244 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
245 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
246 ret = AVERROR(ENOMEM);
251 if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
252 ret = AVERROR(EINVAL);
256 glyph->bitmap = s->face->glyph->bitmap;
257 glyph->bitmap_left = s->face->glyph->bitmap_left;
258 glyph->bitmap_top = s->face->glyph->bitmap_top;
259 glyph->advance = s->face->glyph->advance.x >> 6;
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);
264 /* cache the newly created glyph */
265 if (!(node = av_tree_node_alloc())) {
266 ret = AVERROR(ENOMEM);
269 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
277 av_freep(&glyph->glyph);
283 static av_cold int init(AVFilterContext *ctx)
286 DrawTextContext *s = ctx->priv;
290 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
291 return AVERROR(EINVAL);
299 av_log(ctx, AV_LOG_ERROR,
300 "Both text and text file provided. Please provide only one\n");
301 return AVERROR(EINVAL);
303 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
304 av_log(ctx, AV_LOG_ERROR,
305 "The text file '%s' could not be read or is empty\n",
310 if (!(s->text = av_malloc(textbuf_size+1)))
311 return AVERROR(ENOMEM);
312 memcpy(s->text, textbuf, textbuf_size);
313 s->text[textbuf_size] = 0;
314 av_file_unmap(textbuf, textbuf_size);
318 av_log(ctx, AV_LOG_ERROR,
319 "Either text or a valid file must be provided\n");
320 return AVERROR(EINVAL);
323 if ((err = av_parse_color(s->fontcolor_rgba, s->fontcolor_string, -1, ctx))) {
324 av_log(ctx, AV_LOG_ERROR,
325 "Invalid font color '%s'\n", s->fontcolor_string);
329 if ((err = av_parse_color(s->boxcolor_rgba, s->boxcolor_string, -1, ctx))) {
330 av_log(ctx, AV_LOG_ERROR,
331 "Invalid box color '%s'\n", s->boxcolor_string);
335 if ((err = av_parse_color(s->shadowcolor_rgba, s->shadowcolor_string, -1, ctx))) {
336 av_log(ctx, AV_LOG_ERROR,
337 "Invalid shadow color '%s'\n", s->shadowcolor_string);
341 if ((err = FT_Init_FreeType(&(s->library)))) {
342 av_log(ctx, AV_LOG_ERROR,
343 "Could not load FreeType: %s\n", FT_ERRMSG(err));
344 return AVERROR(EINVAL);
347 /* load the face, and set up the encoding, which is by default UTF-8 */
348 if ((err = FT_New_Face(s->library, s->fontfile, 0, &s->face))) {
349 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
350 s->fontfile, FT_ERRMSG(err));
351 return AVERROR(EINVAL);
353 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
354 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
355 s->fontsize, FT_ERRMSG(err));
356 return AVERROR(EINVAL);
359 s->use_kerning = FT_HAS_KERNING(s->face);
361 /* load the fallback glyph with code 0 */
362 load_glyph(ctx, NULL, 0);
364 /* set the tabsize in pixels */
365 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
366 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
369 s->tabsize *= glyph->advance;
371 #if !HAVE_LOCALTIME_R
372 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
378 static int query_formats(AVFilterContext *ctx)
380 static const enum AVPixelFormat pix_fmts[] = {
381 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
382 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
383 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
384 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,
385 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
386 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
390 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
394 static int glyph_enu_free(void *opaque, void *elem)
400 static av_cold void uninit(AVFilterContext *ctx)
402 DrawTextContext *s = ctx->priv;
405 av_expr_free(s->x_pexpr);
406 av_expr_free(s->y_pexpr);
407 av_expr_free(s->d_pexpr);
408 s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;
409 av_freep(&s->expanded_text);
410 av_freep(&s->positions);
411 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
412 av_tree_destroy(s->glyphs);
414 FT_Done_Face(s->face);
415 FT_Done_FreeType(s->library);
417 for (i = 0; i < 4; i++) {
418 av_freep(&s->box_line[i]);
419 s->pixel_step[i] = 0;
424 static inline int is_newline(uint32_t c)
426 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
429 static int dtext_prepare_text(AVFilterContext *ctx)
431 DrawTextContext *s = ctx->priv;
432 uint32_t code = 0, prev_code = 0;
433 int x = 0, y = 0, i = 0, ret;
434 int text_height, baseline;
435 char *text = s->text;
438 int y_min = 32000, y_max = -32000;
440 Glyph *glyph = NULL, *prev_glyph = NULL;
442 int width = ctx->inputs[0]->w;
443 int height = ctx->inputs[0]->h;
446 time_t now = time(0);
448 uint8_t *buf = s->expanded_text;
449 int buf_size = s->expanded_text_size;
452 buf_size = 2*strlen(s->text)+1;
454 localtime_r(&now, <ime);
456 while ((buf = av_realloc(buf, buf_size))) {
458 if (strftime(buf, buf_size, s->text, <ime) != 0 || *buf == 0)
464 return AVERROR(ENOMEM);
465 text = s->expanded_text = buf;
466 s->expanded_text_size = buf_size;
469 if ((len = strlen(text)) > s->nb_positions) {
470 FT_Vector *p = av_realloc(s->positions,
471 len * sizeof(*s->positions));
473 av_freep(s->positions);
475 return AVERROR(ENOMEM);
478 s->nb_positions = len;
482 /* load and cache glyphs */
483 for (i = 0, p = text; *p; i++) {
484 GET_UTF8(code, *p++, continue;);
488 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
490 ret = load_glyph(ctx, &glyph, code);
495 y_min = FFMIN(glyph->bbox.yMin, y_min);
496 y_max = FFMAX(glyph->bbox.yMax, y_max);
498 text_height = y_max - y_min;
501 /* compute and save position for each glyph */
503 for (i = 0, p = text; *p; i++) {
504 GET_UTF8(code, *p++, continue;);
506 /* skip the \n in the sequence \r\n */
507 if (prev_code == '\r' && code == '\n')
511 if (is_newline(code)) {
512 str_w = FFMAX(str_w, x - s->x);
521 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
524 if (s->use_kerning && prev_glyph && glyph->code) {
525 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
526 ft_kerning_default, &delta);
530 if (x + glyph->bbox.xMax >= width) {
531 str_w = FFMAX(str_w, x);
537 s->positions[i].x = x + glyph->bitmap_left;
538 s->positions[i].y = y - glyph->bitmap_top + baseline;
539 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
540 else x += glyph->advance;
543 str_w = FFMIN(width - 1, FFMAX(str_w, x));
544 y = FFMIN(y + text_height, height - 1);
547 s->var_values[VAR_TEXT_W] = s->var_values[VAR_TW] = s->w;
549 s->var_values[VAR_TEXT_H] = s->var_values[VAR_TH] = s->h;
555 static int config_input(AVFilterLink *inlink)
557 AVFilterContext *ctx = inlink->dst;
558 DrawTextContext *s = ctx->priv;
559 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
562 s->hsub = pix_desc->log2_chroma_w;
563 s->vsub = pix_desc->log2_chroma_h;
565 s->var_values[VAR_E ] = M_E;
566 s->var_values[VAR_PHI] = M_PHI;
567 s->var_values[VAR_PI ] = M_PI;
569 s->var_values[VAR_MAIN_W] =
570 s->var_values[VAR_MW] = ctx->inputs[0]->w;
571 s->var_values[VAR_MAIN_H] =
572 s->var_values[VAR_MH] = ctx->inputs[0]->h;
574 s->var_values[VAR_X] = 0;
575 s->var_values[VAR_Y] = 0;
576 s->var_values[VAR_T] = NAN;
578 av_lfg_init(&s->prng, av_get_random_seed());
580 av_expr_free(s->x_pexpr);
581 av_expr_free(s->y_pexpr);
582 av_expr_free(s->d_pexpr);
583 s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;
584 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
585 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
586 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
587 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
588 (ret = av_expr_parse(&s->d_pexpr, s->d_expr, var_names,
589 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
590 return AVERROR(EINVAL);
593 ff_fill_line_with_color(s->box_line, s->pixel_step,
594 inlink->w, s->boxcolor,
595 inlink->format, s->boxcolor_rgba,
596 &s->is_packed_rgb, s->rgba_map)) < 0)
599 if (!s->is_packed_rgb) {
600 uint8_t *rgba = s->fontcolor_rgba;
601 s->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
602 s->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
603 s->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
604 s->fontcolor[3] = rgba[3];
605 rgba = s->shadowcolor_rgba;
606 s->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
607 s->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
608 s->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
609 s->shadowcolor[3] = rgba[3];
614 return dtext_prepare_text(ctx);
617 #define GET_BITMAP_VAL(r, c) \
618 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
619 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
620 bitmap->buffer[(r) * bitmap->pitch + (c)]
622 #define SET_PIXEL_YUV(frame, yuva_color, val, x, y, hsub, vsub) { \
623 luma_pos = ((x) ) + ((y) ) * frame->linesize[0]; \
624 alpha = yuva_color[3] * (val) * 129; \
625 frame->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * frame->data[0][luma_pos] ) >> 23; \
626 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
627 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[1]; \
628 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[2]; \
629 frame->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * frame->data[1][chroma_pos1]) >> 23; \
630 frame->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * frame->data[2][chroma_pos2]) >> 23; \
634 static inline int draw_glyph_yuv(AVFrame *frame, FT_Bitmap *bitmap, unsigned int x,
635 unsigned int y, unsigned int width, unsigned int height,
636 const uint8_t yuva_color[4], int hsub, int vsub)
639 unsigned int luma_pos, chroma_pos1, chroma_pos2;
642 for (r = 0; r < bitmap->rows && r+y < height; r++) {
643 for (c = 0; c < bitmap->width && c+x < width; c++) {
644 /* get intensity value in the glyph bitmap (source) */
645 src_val = GET_BITMAP_VAL(r, c);
649 SET_PIXEL_YUV(frame, yuva_color, src_val, c+x, y+r, hsub, vsub);
656 #define SET_PIXEL_RGB(frame, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
657 p = frame->data[0] + (x) * pixel_step + ((y) * frame->linesize[0]); \
658 alpha = rgba_color[3] * (val) * 129; \
659 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
660 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
661 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
664 static inline int draw_glyph_rgb(AVFrame *frame, FT_Bitmap *bitmap,
665 unsigned int x, unsigned int y,
666 unsigned int width, unsigned int height, int pixel_step,
667 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
673 for (r = 0; r < bitmap->rows && r+y < height; r++) {
674 for (c = 0; c < bitmap->width && c+x < width; c++) {
675 /* get intensity value in the glyph bitmap (source) */
676 src_val = GET_BITMAP_VAL(r, c);
680 SET_PIXEL_RGB(frame, rgba_color, src_val, c+x, y+r, pixel_step,
681 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
688 static inline void drawbox(AVFrame *frame, unsigned int x, unsigned int y,
689 unsigned int width, unsigned int height,
690 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
691 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
695 if (color[3] != 0xFF) {
696 if (is_rgba_packed) {
698 for (j = 0; j < height; j++)
699 for (i = 0; i < width; i++)
700 SET_PIXEL_RGB(frame, color, 255, i+x, y+j, pixel_step[0],
701 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
703 unsigned int luma_pos, chroma_pos1, chroma_pos2;
704 for (j = 0; j < height; j++)
705 for (i = 0; i < width; i++)
706 SET_PIXEL_YUV(frame, color, 255, i+x, y+j, hsub, vsub);
709 ff_draw_rectangle(frame->data, frame->linesize,
710 line, pixel_step, hsub, vsub,
711 x, y, width, height);
715 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
716 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
718 char *text = HAVE_LOCALTIME_R ? s->expanded_text : s->text;
724 for (i = 0, p = text; *p; i++) {
726 GET_UTF8(code, *p++, continue;);
728 /* skip new line chars, just go to new line */
729 if (code == '\n' || code == '\r' || code == '\t')
733 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
735 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
736 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
737 return AVERROR(EINVAL);
739 if (s->is_packed_rgb) {
740 draw_glyph_rgb(frame, &glyph->bitmap,
741 s->positions[i].x+x, s->positions[i].y+y, width, height,
742 s->pixel_step[0], rgbcolor, s->rgba_map);
744 draw_glyph_yuv(frame, &glyph->bitmap,
745 s->positions[i].x+x, s->positions[i].y+y, width, height,
746 yuvcolor, s->hsub, s->vsub);
753 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
754 int width, int height)
756 DrawTextContext *s = ctx->priv;
761 drawbox(frame, s->x, s->y, s->w, s->h,
762 s->box_line, s->pixel_step, s->boxcolor,
763 s->hsub, s->vsub, s->is_packed_rgb,
766 if (s->shadowx || s->shadowy) {
767 if ((ret = draw_glyphs(s, frame, width, height,
771 s->y + s->shadowy)) < 0)
775 if ((ret = draw_glyphs(s, frame, width, height,
785 static inline int normalize_double(int *n, double d)
790 ret = AVERROR(EINVAL);
791 } else if (d > INT_MAX || d < INT_MIN) {
792 *n = d > INT_MAX ? INT_MAX : INT_MIN;
793 ret = AVERROR(EINVAL);
800 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
802 AVFilterContext *ctx = inlink->dst;
803 DrawTextContext *s = ctx->priv;
806 if ((ret = dtext_prepare_text(ctx)) < 0) {
807 av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
808 av_frame_free(&frame);
812 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
813 NAN : frame->pts * av_q2d(inlink->time_base);
814 s->var_values[VAR_X] =
815 av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
816 s->var_values[VAR_Y] =
817 av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
818 s->var_values[VAR_X] =
819 av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
821 s->draw = av_expr_eval(s->d_pexpr, s->var_values, &s->prng);
823 normalize_double(&s->x, s->var_values[VAR_X]);
824 normalize_double(&s->y, s->var_values[VAR_Y]);
827 if (s->x < 0) s->x = 0;
828 if (s->y < 0) s->y = 0;
829 if ((unsigned)s->x + (unsigned)s->w > inlink->w)
830 s->x = inlink->w - s->w;
831 if ((unsigned)s->y + (unsigned)s->h > inlink->h)
832 s->y = inlink->h - s->h;
835 s->x &= ~((1 << s->hsub) - 1);
836 s->y &= ~((1 << s->vsub) - 1);
838 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
839 (int)s->var_values[VAR_N], s->var_values[VAR_T],
840 s->x, s->y, s->x+s->w, s->y+s->h);
843 draw_text(inlink->dst, frame, frame->width, frame->height);
845 s->var_values[VAR_N] += 1.0;
847 return ff_filter_frame(inlink->dst->outputs[0], frame);
850 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
853 .type = AVMEDIA_TYPE_VIDEO,
854 .get_video_buffer = ff_null_get_video_buffer,
855 .filter_frame = filter_frame,
856 .config_props = config_input,
862 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
865 .type = AVMEDIA_TYPE_VIDEO,
870 AVFilter avfilter_vf_drawtext = {
872 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
873 .priv_size = sizeof(DrawTextContext),
874 .priv_class = &drawtext_class,
877 .query_formats = query_formats,
879 .inputs = avfilter_vf_drawtext_inputs,
880 .outputs = avfilter_vf_drawtext_outputs,