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 FFmpeg.
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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
33 #include "libavutil/avstring.h"
34 #include "libavutil/file.h"
35 #include "libavutil/eval.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/random_seed.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/timecode.h"
40 #include "libavutil/tree.h"
41 #include "libavutil/lfg.h"
43 #include "drawutils.h"
50 #include <freetype/config/ftheader.h>
51 #include FT_FREETYPE_H
54 #include <fontconfig/fontconfig.h>
57 static const char *const var_names[] = {
60 "line_h", "lh", ///< line height, same as max_glyph_h
61 "main_h", "h", "H", ///< height of the input video
62 "main_w", "w", "W", ///< width of the input video
63 "max_glyph_a", "ascent", ///< max glyph ascent
64 "max_glyph_d", "descent", ///< min glyph descent
65 "max_glyph_h", ///< max glyph height
66 "max_glyph_w", ///< max glyph width
67 "n", ///< number of frame
69 "t", ///< timestamp expressed in seconds
70 "text_h", "th", ///< height of the rendered text
71 "text_w", "tw", ///< width of the rendered text
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[] = {
97 VAR_MAIN_H, VAR_h, VAR_H,
98 VAR_MAIN_W, VAR_w, VAR_W,
99 VAR_MAX_GLYPH_A, VAR_ASCENT,
100 VAR_MAX_GLYPH_D, VAR_DESCENT,
114 const AVClass *class;
115 int reinit; ///< tells if the filter is being reinited
116 uint8_t *fontfile; ///< font to be used
117 uint8_t *text; ///< text to be drawn
118 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
119 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
120 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
121 FT_Vector *positions; ///< positions for each element in the text
122 size_t nb_positions; ///< number of elements of positions array
123 char *textfile; ///< file with text to be drawn
124 int x; ///< x position to start drawing text
125 int y; ///< y position to start drawing text
126 int max_glyph_w; ///< max glyph width
127 int max_glyph_h; ///< max glyph height
128 int shadowx, shadowy;
129 unsigned int fontsize; ///< font size to use
130 char *fontcolor_string; ///< font color as string
131 char *boxcolor_string; ///< box color as string
132 char *shadowcolor_string; ///< shadow color as string
134 short int draw_box; ///< draw box around text - true or false
135 int use_kerning; ///< font kerning is used - true/false
136 int tabsize; ///< tab size
137 int fix_bounds; ///< do we let it go out of frame bounds - t/f
140 FFDrawColor fontcolor; ///< foreground color
141 FFDrawColor shadowcolor; ///< shadow color
142 FFDrawColor boxcolor; ///< background color
144 FT_Library library; ///< freetype font library handle
145 FT_Face face; ///< freetype font face handle
146 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
147 char *x_expr; ///< expression for x position
148 char *y_expr; ///< expression for y position
149 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
150 int64_t basetime; ///< base pts time in the real world for display
151 double var_values[VAR_VARS_NB];
152 char *draw_expr; ///< expression for draw
153 AVExpr *draw_pexpr; ///< parsed expression for draw
154 int draw; ///< set to zero to prevent drawing
155 AVLFG prng; ///< random
156 char *tc_opt_string; ///< specified timecode option string
157 AVRational tc_rate; ///< frame rate for timecode
158 AVTimecode tc; ///< timecode context
159 int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
163 #define OFFSET(x) offsetof(DrawTextContext, x)
165 static const AVOption drawtext_options[]= {
166 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
167 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
168 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
169 {"fontcolor", "set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
170 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
171 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
172 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
173 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=0}, 0, INT_MAX },
174 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
175 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
176 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
177 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
178 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
179 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX },
180 {"draw", "if false do not draw", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
181 {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
182 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
183 {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
184 {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
185 {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
186 {"fix_bounds", "if true, check and fix text coords to avoid clipping",
187 OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },
189 /* FT_LOAD_* flags */
190 {"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" },
191 {"default", "set default", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
192 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
193 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
194 {"render", "set render", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
195 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
196 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
197 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
198 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
199 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
200 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
201 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
202 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
203 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
204 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
205 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
209 static const AVClass drawtext_class = {
211 av_default_item_name,
215 #undef __FTERRORS_H__
216 #define FT_ERROR_START_LIST {
217 #define FT_ERRORDEF(e, v, s) { (e), (s) },
218 #define FT_ERROR_END_LIST { 0, NULL } };
224 } static ft_errors[] =
227 #define FT_ERRMSG(e) ft_errors[e].err_msg
232 FT_Bitmap bitmap; ///< array holding bitmaps of font
239 static int glyph_cmp(void *key, const void *b)
241 const Glyph *a = key, *bb = b;
242 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
243 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
247 * Load glyphs corresponding to the UTF-32 codepoint code.
249 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
251 DrawTextContext *dtext = ctx->priv;
253 struct AVTreeNode *node = NULL;
256 /* load glyph into dtext->face->glyph */
257 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
258 return AVERROR(EINVAL);
261 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
262 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
263 ret = AVERROR(ENOMEM);
268 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
269 ret = AVERROR(EINVAL);
273 glyph->bitmap = dtext->face->glyph->bitmap;
274 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
275 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
276 glyph->advance = dtext->face->glyph->advance.x >> 6;
278 /* measure text height to calculate text_height (or the maximum text height) */
279 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
281 /* cache the newly created glyph */
282 if (!(node = av_mallocz(av_tree_node_size))) {
283 ret = AVERROR(ENOMEM);
286 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
294 av_freep(&glyph->glyph);
300 static int load_font_file(AVFilterContext *ctx, const char *path, int index,
303 DrawTextContext *dtext = ctx->priv;
306 err = FT_New_Face(dtext->library, path, index, &dtext->face);
308 *error = FT_ERRMSG(err);
309 return AVERROR(EINVAL);
314 #if CONFIG_FONTCONFIG
315 static int load_font_fontconfig(AVFilterContext *ctx, const char **error)
317 DrawTextContext *dtext = ctx->priv;
318 FcConfig *fontconfig;
319 FcPattern *pattern, *fpat;
320 FcResult result = FcResultMatch;
325 fontconfig = FcInitLoadConfigAndFonts();
327 *error = "impossible to init fontconfig\n";
328 return AVERROR(EINVAL);
330 pattern = FcNameParse(dtext->fontfile ? dtext->fontfile :
331 (uint8_t *)(intptr_t)"default");
333 *error = "could not parse fontconfig pattern";
334 return AVERROR(EINVAL);
336 if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {
337 *error = "could not substitue fontconfig options"; /* very unlikely */
338 return AVERROR(EINVAL);
340 FcDefaultSubstitute(pattern);
341 fpat = FcFontMatch(fontconfig, pattern, &result);
342 if (!fpat || result != FcResultMatch) {
343 *error = "impossible to find a matching font";
344 return AVERROR(EINVAL);
346 if (FcPatternGetString (fpat, FC_FILE, 0, &filename) != FcResultMatch ||
347 FcPatternGetInteger(fpat, FC_INDEX, 0, &index ) != FcResultMatch ||
348 FcPatternGetDouble (fpat, FC_SIZE, 0, &size ) != FcResultMatch) {
349 *error = "impossible to find font information";
350 return AVERROR(EINVAL);
352 av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
353 if (!dtext->fontsize)
354 dtext->fontsize = size + 0.5;
355 err = load_font_file(ctx, filename, index, error);
358 FcPatternDestroy(fpat);
359 FcPatternDestroy(pattern);
360 FcConfigDestroy(fontconfig);
365 static int load_font(AVFilterContext *ctx)
367 DrawTextContext *dtext = ctx->priv;
369 const char *error = "unknown error\n";
371 /* load the face, and set up the encoding, which is by default UTF-8 */
372 err = load_font_file(ctx, dtext->fontfile, 0, &error);
375 #if CONFIG_FONTCONFIG
376 err = load_font_fontconfig(ctx, &error);
380 av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
381 dtext->fontfile, error);
385 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
388 DrawTextContext *dtext = ctx->priv;
391 dtext->class = &drawtext_class;
392 av_opt_set_defaults(dtext);
394 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
395 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
399 if (!dtext->fontfile && !CONFIG_FONTCONFIG) {
400 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
401 return AVERROR(EINVAL);
404 if (dtext->textfile) {
409 av_log(ctx, AV_LOG_ERROR,
410 "Both text and text file provided. Please provide only one\n");
411 return AVERROR(EINVAL);
413 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
414 av_log(ctx, AV_LOG_ERROR,
415 "The text file '%s' could not be read or is empty\n",
420 if (!(dtext->text = av_malloc(textbuf_size+1)))
421 return AVERROR(ENOMEM);
422 memcpy(dtext->text, textbuf, textbuf_size);
423 dtext->text[textbuf_size] = 0;
424 av_file_unmap(textbuf, textbuf_size);
427 if (dtext->tc_opt_string) {
428 int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,
429 dtext->tc_opt_string, ctx);
433 dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
435 dtext->text = av_strdup("");
439 av_log(ctx, AV_LOG_ERROR,
440 "Either text, a valid file or a timecode must be provided\n");
441 return AVERROR(EINVAL);
444 if ((err = av_parse_color(dtext->fontcolor.rgba, dtext->fontcolor_string, -1, ctx))) {
445 av_log(ctx, AV_LOG_ERROR,
446 "Invalid font color '%s'\n", dtext->fontcolor_string);
450 if ((err = av_parse_color(dtext->boxcolor.rgba, dtext->boxcolor_string, -1, ctx))) {
451 av_log(ctx, AV_LOG_ERROR,
452 "Invalid box color '%s'\n", dtext->boxcolor_string);
456 if ((err = av_parse_color(dtext->shadowcolor.rgba, dtext->shadowcolor_string, -1, ctx))) {
457 av_log(ctx, AV_LOG_ERROR,
458 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
462 if ((err = FT_Init_FreeType(&(dtext->library)))) {
463 av_log(ctx, AV_LOG_ERROR,
464 "Could not load FreeType: %s\n", FT_ERRMSG(err));
465 return AVERROR(EINVAL);
468 err = load_font(ctx);
471 if (!dtext->fontsize)
472 dtext->fontsize = 16;
473 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
474 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
475 dtext->fontsize, FT_ERRMSG(err));
476 return AVERROR(EINVAL);
479 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
481 /* load the fallback glyph with code 0 */
482 load_glyph(ctx, NULL, 0);
484 /* set the tabsize in pixels */
485 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
486 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
489 dtext->tabsize *= glyph->advance;
494 static int query_formats(AVFilterContext *ctx)
496 ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
500 static int glyph_enu_free(void *opaque, void *elem)
504 FT_Done_Glyph(*glyph->glyph);
505 av_freep(&glyph->glyph);
510 static av_cold void uninit(AVFilterContext *ctx)
512 DrawTextContext *dtext = ctx->priv;
514 av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
515 av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
516 av_expr_free(dtext->draw_pexpr); dtext->draw_pexpr = NULL;
518 av_freep(&dtext->boxcolor_string);
519 av_freep(&dtext->expanded_text);
520 av_freep(&dtext->fontcolor_string);
521 av_freep(&dtext->fontfile);
522 av_freep(&dtext->shadowcolor_string);
523 av_freep(&dtext->text);
524 av_freep(&dtext->x_expr);
525 av_freep(&dtext->y_expr);
526 av_freep(&dtext->draw_expr);
528 av_freep(&dtext->positions);
529 dtext->nb_positions = 0;
531 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
532 av_tree_destroy(dtext->glyphs);
533 dtext->glyphs = NULL;
535 FT_Done_Face(dtext->face);
536 FT_Done_FreeType(dtext->library);
539 static inline int is_newline(uint32_t c)
541 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
544 static int config_input(AVFilterLink *inlink)
546 AVFilterContext *ctx = inlink->dst;
547 DrawTextContext *dtext = ctx->priv;
550 ff_draw_init(&dtext->dc, inlink->format, 0);
551 ff_draw_color(&dtext->dc, &dtext->fontcolor, dtext->fontcolor.rgba);
552 ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba);
553 ff_draw_color(&dtext->dc, &dtext->boxcolor, dtext->boxcolor.rgba);
555 dtext->var_values[VAR_w] = dtext->var_values[VAR_W] = dtext->var_values[VAR_MAIN_W] = inlink->w;
556 dtext->var_values[VAR_h] = dtext->var_values[VAR_H] = dtext->var_values[VAR_MAIN_H] = inlink->h;
557 dtext->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
558 dtext->var_values[VAR_DAR] = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
559 dtext->var_values[VAR_HSUB] = 1 << dtext->dc.hsub_max;
560 dtext->var_values[VAR_VSUB] = 1 << dtext->dc.vsub_max;
561 dtext->var_values[VAR_X] = NAN;
562 dtext->var_values[VAR_Y] = NAN;
564 dtext->var_values[VAR_N] = 0;
565 dtext->var_values[VAR_T] = NAN;
567 av_lfg_init(&dtext->prng, av_get_random_seed());
569 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
570 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
571 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
572 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
573 (ret = av_expr_parse(&dtext->draw_pexpr, dtext->draw_expr, var_names,
574 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
576 return AVERROR(EINVAL);
581 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
583 DrawTextContext *dtext = ctx->priv;
585 if (!strcmp(cmd, "reinit")) {
589 if ((ret = init(ctx, arg, NULL)) < 0)
591 return config_input(ctx->inputs[0]);
594 return AVERROR(ENOSYS);
597 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
598 int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
600 char *text = dtext->expanded_text;
606 for (i = 0, p = text; *p; i++) {
608 GET_UTF8(code, *p++, continue;);
610 /* skip new line chars, just go to new line */
611 if (code == '\n' || code == '\r' || code == '\t')
615 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
617 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
618 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
619 return AVERROR(EINVAL);
621 x1 = dtext->positions[i].x+dtext->x+x;
622 y1 = dtext->positions[i].y+dtext->y+y;
624 ff_blend_mask(&dtext->dc, color,
625 picref->data, picref->linesize, width, height,
626 glyph->bitmap.buffer, glyph->bitmap.pitch,
627 glyph->bitmap.width, glyph->bitmap.rows,
628 glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
635 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
636 int width, int height)
638 DrawTextContext *dtext = ctx->priv;
639 uint32_t code = 0, prev_code = 0;
640 int x = 0, y = 0, i = 0, ret;
641 int max_text_line_w = 0, len;
643 char *text = dtext->text;
645 int y_min = 32000, y_max = -32000;
646 int x_min = 32000, x_max = -32000;
648 Glyph *glyph = NULL, *prev_glyph = NULL;
651 time_t now = time(0);
653 uint8_t *buf = dtext->expanded_text;
654 int buf_size = dtext->expanded_text_size;
656 if(dtext->basetime != AV_NOPTS_VALUE)
657 now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
660 buf_size = 2*strlen(dtext->text)+1;
661 buf = av_malloc(buf_size);
665 localtime_r(&now, <ime);
667 if(strchr(dtext->text, '%'))
668 ltime= *localtime(&now);
673 if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0)
676 } while ((buf = av_realloc(buf, buf_size)));
678 if (dtext->tc_opt_string) {
679 char tcbuf[AV_TIMECODE_STR_SIZE];
680 av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);
681 buf = av_asprintf("%s%s", dtext->text, tcbuf);
685 return AVERROR(ENOMEM);
686 text = dtext->expanded_text = buf;
687 dtext->expanded_text_size = buf_size;
688 if ((len = strlen(text)) > dtext->nb_positions) {
689 if (!(dtext->positions =
690 av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
691 return AVERROR(ENOMEM);
692 dtext->nb_positions = len;
698 /* load and cache glyphs */
699 for (i = 0, p = text; *p; i++) {
700 GET_UTF8(code, *p++, continue;);
704 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
706 load_glyph(ctx, &glyph, code);
709 y_min = FFMIN(glyph->bbox.yMin, y_min);
710 y_max = FFMAX(glyph->bbox.yMax, y_max);
711 x_min = FFMIN(glyph->bbox.xMin, x_min);
712 x_max = FFMAX(glyph->bbox.xMax, x_max);
714 dtext->max_glyph_h = y_max - y_min;
715 dtext->max_glyph_w = x_max - x_min;
717 /* compute and save position for each glyph */
719 for (i = 0, p = text; *p; i++) {
720 GET_UTF8(code, *p++, continue;);
722 /* skip the \n in the sequence \r\n */
723 if (prev_code == '\r' && code == '\n')
727 if (is_newline(code)) {
728 max_text_line_w = FFMAX(max_text_line_w, x);
729 y += dtext->max_glyph_h;
737 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
740 if (dtext->use_kerning && prev_glyph && glyph->code) {
741 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
742 ft_kerning_default, &delta);
747 dtext->positions[i].x = x + glyph->bitmap_left;
748 dtext->positions[i].y = y - glyph->bitmap_top + y_max;
749 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
750 else x += glyph->advance;
753 max_text_line_w = FFMAX(x, max_text_line_w);
755 dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
756 dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
758 dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
759 dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
760 dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
761 dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
763 dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
765 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
766 dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
767 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
768 dtext->draw = av_expr_eval(dtext->draw_pexpr, dtext->var_values, &dtext->prng);
773 box_w = FFMIN(width - 1 , max_text_line_w);
774 box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
778 ff_blend_rectangle(&dtext->dc, &dtext->boxcolor,
779 picref->data, picref->linesize, width, height,
780 dtext->x, dtext->y, box_w, box_h);
782 if (dtext->shadowx || dtext->shadowy) {
783 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor.rgba,
784 &dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
788 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor.rgba,
789 &dtext->fontcolor, 0, 0)) < 0)
795 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
797 static void end_frame(AVFilterLink *inlink)
799 AVFilterContext *ctx = inlink->dst;
800 AVFilterLink *outlink = ctx->outputs[0];
801 DrawTextContext *dtext = ctx->priv;
802 AVFilterBufferRef *picref = inlink->cur_buf;
804 dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
805 NAN : picref->pts * av_q2d(inlink->time_base);
807 draw_text(ctx, picref, picref->video->w, picref->video->h);
809 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
810 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
811 (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
814 dtext->var_values[VAR_N] += 1.0;
816 ff_draw_slice(outlink, 0, picref->video->h, 1);
817 ff_end_frame(outlink);
820 AVFilter avfilter_vf_drawtext = {
822 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
823 .priv_size = sizeof(DrawTextContext),
826 .query_formats = query_formats,
828 .inputs = (const AVFilterPad[]) {{ .name = "default",
829 .type = AVMEDIA_TYPE_VIDEO,
830 .get_video_buffer = ff_null_get_video_buffer,
831 .start_frame = ff_null_start_frame,
832 .draw_slice = null_draw_slice,
833 .end_frame = end_frame,
834 .config_props = config_input,
835 .min_perms = AV_PERM_WRITE |
837 .rej_perms = AV_PERM_PRESERVE },
839 .outputs = (const AVFilterPad[]) {{ .name = "default",
840 .type = AVMEDIA_TYPE_VIDEO, },
842 .process_command = command,