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/bprint.h"
35 #include "libavutil/common.h"
36 #include "libavutil/file.h"
37 #include "libavutil/eval.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/random_seed.h"
40 #include "libavutil/parseutils.h"
41 #include "libavutil/timecode.h"
42 #include "libavutil/tree.h"
43 #include "libavutil/lfg.h"
45 #include "drawutils.h"
51 #include <freetype/config/ftheader.h>
52 #include FT_FREETYPE_H
55 #include <fontconfig/fontconfig.h>
58 static const char *const var_names[] = {
61 "line_h", "lh", ///< line height, same as max_glyph_h
62 "main_h", "h", "H", ///< height of the input video
63 "main_w", "w", "W", ///< width of the input video
64 "max_glyph_a", "ascent", ///< max glyph ascent
65 "max_glyph_d", "descent", ///< min glyph descent
66 "max_glyph_h", ///< max glyph height
67 "max_glyph_w", ///< max glyph width
68 "n", ///< number of frame
70 "t", ///< timestamp expressed in seconds
71 "text_h", "th", ///< height of the rendered text
72 "text_w", "tw", ///< width of the rendered text
79 static const char *const fun2_names[] = {
83 static double drand(void *opaque, double min, double max)
85 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
88 typedef double (*eval_func2)(void *, double a, double b);
90 static const eval_func2 fun2[] = {
99 VAR_MAIN_H, VAR_h, VAR_H,
100 VAR_MAIN_W, VAR_w, VAR_W,
101 VAR_MAX_GLYPH_A, VAR_ASCENT,
102 VAR_MAX_GLYPH_D, VAR_DESCENT,
116 enum expansion_mode {
123 const AVClass *class;
124 enum expansion_mode exp_mode; ///< expansion mode to use for the text
125 int reinit; ///< tells if the filter is being reinited
126 uint8_t *fontfile; ///< font to be used
127 uint8_t *text; ///< text to be drawn
128 AVBPrint expanded_text; ///< used to contain the expanded text
129 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
130 FT_Vector *positions; ///< positions for each element in the text
131 size_t nb_positions; ///< number of elements of positions array
132 char *textfile; ///< file with text to be drawn
133 int x; ///< x position to start drawing text
134 int y; ///< y position to start drawing text
135 int max_glyph_w; ///< max glyph width
136 int max_glyph_h; ///< max glyph height
137 int shadowx, shadowy;
138 unsigned int fontsize; ///< font size to use
140 short int draw_box; ///< draw box around text - true or false
141 int use_kerning; ///< font kerning is used - true/false
142 int tabsize; ///< tab size
143 int fix_bounds; ///< do we let it go out of frame bounds - t/f
146 FFDrawColor fontcolor; ///< foreground color
147 FFDrawColor shadowcolor; ///< shadow color
148 FFDrawColor boxcolor; ///< background color
150 FT_Library library; ///< freetype font library handle
151 FT_Face face; ///< freetype font face handle
152 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
153 char *x_expr; ///< expression for x position
154 char *y_expr; ///< expression for y position
155 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
156 int64_t basetime; ///< base pts time in the real world for display
157 double var_values[VAR_VARS_NB];
158 char *draw_expr; ///< expression for draw
159 AVExpr *draw_pexpr; ///< parsed expression for draw
160 int draw; ///< set to zero to prevent drawing
161 AVLFG prng; ///< random
162 char *tc_opt_string; ///< specified timecode option string
163 AVRational tc_rate; ///< frame rate for timecode
164 AVTimecode tc; ///< timecode context
165 int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
166 int reload; ///< reload text file for each frame
167 int start_number; ///< starting frame number for n/frame_num var
170 #define OFFSET(x) offsetof(DrawTextContext, x)
171 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
173 static const AVOption drawtext_options[]= {
174 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
175 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
176 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
177 {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
178 {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
179 {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
180 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
181 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
182 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
183 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
184 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
185 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
186 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
187 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
188 {"draw", "if false do not draw", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS},
190 {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
191 {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
192 {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
193 {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
195 {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
196 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
197 {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
198 {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
199 {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
200 {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
201 {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
202 {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
204 /* FT_LOAD_* flags */
205 { "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" },
206 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
207 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
208 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
209 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
210 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
211 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
212 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
213 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
214 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
215 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
216 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
217 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
218 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
219 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
220 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
224 AVFILTER_DEFINE_CLASS(drawtext);
226 #undef __FTERRORS_H__
227 #define FT_ERROR_START_LIST {
228 #define FT_ERRORDEF(e, v, s) { (e), (s) },
229 #define FT_ERROR_END_LIST { 0, NULL } };
235 } static ft_errors[] =
238 #define FT_ERRMSG(e) ft_errors[e].err_msg
243 FT_Bitmap bitmap; ///< array holding bitmaps of font
250 static int glyph_cmp(void *key, const void *b)
252 const Glyph *a = key, *bb = b;
253 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
254 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
258 * Load glyphs corresponding to the UTF-32 codepoint code.
260 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
262 DrawTextContext *s = ctx->priv;
264 struct AVTreeNode *node = NULL;
267 /* load glyph into s->face->glyph */
268 if (FT_Load_Char(s->face, code, s->ft_load_flags))
269 return AVERROR(EINVAL);
272 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
273 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
274 ret = AVERROR(ENOMEM);
279 if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
280 ret = AVERROR(EINVAL);
284 glyph->bitmap = s->face->glyph->bitmap;
285 glyph->bitmap_left = s->face->glyph->bitmap_left;
286 glyph->bitmap_top = s->face->glyph->bitmap_top;
287 glyph->advance = s->face->glyph->advance.x >> 6;
289 /* measure text height to calculate text_height (or the maximum text height) */
290 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
292 /* cache the newly created glyph */
293 if (!(node = av_tree_node_alloc())) {
294 ret = AVERROR(ENOMEM);
297 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
305 av_freep(&glyph->glyph);
311 static int load_font_file(AVFilterContext *ctx, const char *path, int index,
314 DrawTextContext *s = ctx->priv;
317 err = FT_New_Face(s->library, path, index, &s->face);
319 *error = FT_ERRMSG(err);
320 return AVERROR(EINVAL);
325 #if CONFIG_FONTCONFIG
326 static int load_font_fontconfig(AVFilterContext *ctx, const char **error)
328 DrawTextContext *s = ctx->priv;
329 FcConfig *fontconfig;
330 FcPattern *pattern, *fpat;
331 FcResult result = FcResultMatch;
336 fontconfig = FcInitLoadConfigAndFonts();
338 *error = "impossible to init fontconfig\n";
339 return AVERROR(EINVAL);
341 pattern = FcNameParse(s->fontfile ? s->fontfile :
342 (uint8_t *)(intptr_t)"default");
344 *error = "could not parse fontconfig pattern";
345 return AVERROR(EINVAL);
347 if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {
348 *error = "could not substitue fontconfig options"; /* very unlikely */
349 return AVERROR(EINVAL);
351 FcDefaultSubstitute(pattern);
352 fpat = FcFontMatch(fontconfig, pattern, &result);
353 if (!fpat || result != FcResultMatch) {
354 *error = "impossible to find a matching font";
355 return AVERROR(EINVAL);
357 if (FcPatternGetString (fpat, FC_FILE, 0, &filename) != FcResultMatch ||
358 FcPatternGetInteger(fpat, FC_INDEX, 0, &index ) != FcResultMatch ||
359 FcPatternGetDouble (fpat, FC_SIZE, 0, &size ) != FcResultMatch) {
360 *error = "impossible to find font information";
361 return AVERROR(EINVAL);
363 av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
365 s->fontsize = size + 0.5;
366 err = load_font_file(ctx, filename, index, error);
369 FcPatternDestroy(fpat);
370 FcPatternDestroy(pattern);
371 FcConfigDestroy(fontconfig);
376 static int load_font(AVFilterContext *ctx)
378 DrawTextContext *s = ctx->priv;
380 const char *error = "unknown error\n";
382 /* load the face, and set up the encoding, which is by default UTF-8 */
383 err = load_font_file(ctx, s->fontfile, 0, &error);
386 #if CONFIG_FONTCONFIG
387 err = load_font_fontconfig(ctx, &error);
391 av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
396 static int load_textfile(AVFilterContext *ctx)
398 DrawTextContext *s = ctx->priv;
403 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
404 av_log(ctx, AV_LOG_ERROR,
405 "The text file '%s' could not be read or is empty\n",
410 if (!(s->text = av_realloc(s->text, textbuf_size + 1)))
411 return AVERROR(ENOMEM);
412 memcpy(s->text, textbuf, textbuf_size);
413 s->text[textbuf_size] = 0;
414 av_file_unmap(textbuf, textbuf_size);
419 static av_cold int init(AVFilterContext *ctx)
422 DrawTextContext *s = ctx->priv;
425 if (!s->fontfile && !CONFIG_FONTCONFIG) {
426 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
427 return AVERROR(EINVAL);
432 av_log(ctx, AV_LOG_ERROR,
433 "Both text and text file provided. Please provide only one\n");
434 return AVERROR(EINVAL);
436 if ((err = load_textfile(ctx)) < 0)
440 if (s->reload && !s->textfile)
441 av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
443 if (s->tc_opt_string) {
444 int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
445 s->tc_opt_string, ctx);
449 s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
451 s->text = av_strdup("");
455 av_log(ctx, AV_LOG_ERROR,
456 "Either text, a valid file or a timecode must be provided\n");
457 return AVERROR(EINVAL);
460 if ((err = FT_Init_FreeType(&(s->library)))) {
461 av_log(ctx, AV_LOG_ERROR,
462 "Could not load FreeType: %s\n", FT_ERRMSG(err));
463 return AVERROR(EINVAL);
466 err = load_font(ctx);
471 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
472 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
473 s->fontsize, FT_ERRMSG(err));
474 return AVERROR(EINVAL);
477 s->use_kerning = FT_HAS_KERNING(s->face);
479 /* load the fallback glyph with code 0 */
480 load_glyph(ctx, NULL, 0);
482 /* set the tabsize in pixels */
483 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
484 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
487 s->tabsize *= glyph->advance;
489 if (s->exp_mode == EXP_STRFTIME &&
490 (strchr(s->text, '%') || strchr(s->text, '\\')))
491 av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
493 av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
498 static int query_formats(AVFilterContext *ctx)
500 ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
504 static int glyph_enu_free(void *opaque, void *elem)
508 FT_Done_Glyph(*glyph->glyph);
509 av_freep(&glyph->glyph);
514 static av_cold void uninit(AVFilterContext *ctx)
516 DrawTextContext *s = ctx->priv;
518 av_expr_free(s->x_pexpr);
519 av_expr_free(s->y_pexpr);
520 av_expr_free(s->draw_pexpr);
521 s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
522 av_freep(&s->positions);
526 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
527 av_tree_destroy(s->glyphs);
530 FT_Done_Face(s->face);
531 FT_Done_FreeType(s->library);
533 av_bprint_finalize(&s->expanded_text, NULL);
536 static inline int is_newline(uint32_t c)
538 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
541 static int config_input(AVFilterLink *inlink)
543 AVFilterContext *ctx = inlink->dst;
544 DrawTextContext *s = ctx->priv;
547 ff_draw_init(&s->dc, inlink->format, 0);
548 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
549 ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
550 ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
552 s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
553 s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
554 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
555 s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
556 s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
557 s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
558 s->var_values[VAR_X] = NAN;
559 s->var_values[VAR_Y] = NAN;
560 s->var_values[VAR_T] = NAN;
562 av_lfg_init(&s->prng, av_get_random_seed());
564 av_expr_free(s->x_pexpr);
565 av_expr_free(s->y_pexpr);
566 av_expr_free(s->draw_pexpr);
567 s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
568 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
569 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
570 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
571 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
572 (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,
573 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
575 return AVERROR(EINVAL);
580 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
582 DrawTextContext *s = ctx->priv;
584 if (!strcmp(cmd, "reinit")) {
588 if ((ret = init(ctx)) < 0)
590 return config_input(ctx->inputs[0]);
593 return AVERROR(ENOSYS);
596 static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
597 char *fct, unsigned argc, char **argv, int tag)
599 DrawTextContext *s = ctx->priv;
601 av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
605 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
606 char *fct, unsigned argc, char **argv, int tag)
608 DrawTextContext *s = ctx->priv;
610 av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
614 static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
615 char *fct, unsigned argc, char **argv, int tag)
617 DrawTextContext *s = ctx->priv;
619 av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
623 #if !HAVE_LOCALTIME_R
624 static void localtime_r(const time_t *t, struct tm *tm)
630 static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
631 char *fct, unsigned argc, char **argv, int tag)
633 const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
639 localtime_r(&now, &tm);
642 av_bprint_strftime(bp, fmt, &tm);
646 static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
647 char *fct, unsigned argc, char **argv, int tag)
649 DrawTextContext *s = ctx->priv;
653 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
654 NULL, NULL, fun2_names, fun2,
657 av_log(ctx, AV_LOG_ERROR,
658 "Expression '%s' for the expr text expansion function is not valid\n",
661 av_bprintf(bp, "%f", res);
666 static const struct drawtext_function {
668 unsigned argc_min, argc_max;
669 int tag; /**< opaque argument to func */
670 int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
672 { "expr", 1, 1, 0, func_eval_expr },
673 { "e", 1, 1, 0, func_eval_expr },
674 { "pict_type", 0, 0, 0, func_pict_type },
675 { "pts", 0, 0, 0, func_pts },
676 { "gmtime", 0, 1, 'G', func_strftime },
677 { "localtime", 0, 1, 'L', func_strftime },
678 { "frame_num", 0, 0, 0, func_frame_num },
679 { "n", 0, 0, 0, func_frame_num },
682 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
683 unsigned argc, char **argv)
687 for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
688 if (strcmp(fct, functions[i].name))
690 if (argc < functions[i].argc_min) {
691 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
692 fct, functions[i].argc_min);
693 return AVERROR(EINVAL);
695 if (argc > functions[i].argc_max) {
696 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
697 fct, functions[i].argc_max);
698 return AVERROR(EINVAL);
702 if (i >= FF_ARRAY_ELEMS(functions)) {
703 av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
704 return AVERROR(EINVAL);
706 return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
709 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
711 const char *text = *rtext;
712 char *argv[16] = { NULL };
713 unsigned argc = 0, i;
717 av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
718 return AVERROR(EINVAL);
722 if (!(argv[argc++] = av_get_token(&text, ":}"))) {
723 ret = AVERROR(ENOMEM);
727 av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
728 ret = AVERROR(EINVAL);
731 if (argc == FF_ARRAY_ELEMS(argv))
732 av_freep(&argv[--argc]); /* error will be caught later */
738 if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
741 *rtext = (char *)text + 1;
744 for (i = 0; i < argc; i++)
749 static int expand_text(AVFilterContext *ctx)
751 DrawTextContext *s = ctx->priv;
752 char *text = s->text;
753 AVBPrint *bp = &s->expanded_text;
758 if (*text == '\\' && text[1]) {
759 av_bprint_chars(bp, text[1], 1);
761 } else if (*text == '%') {
763 if ((ret = expand_function(ctx, bp, &text)) < 0)
766 av_bprint_chars(bp, *text, 1);
770 if (!av_bprint_is_complete(bp))
771 return AVERROR(ENOMEM);
775 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
776 int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
778 char *text = s->expanded_text.str;
784 for (i = 0, p = text; *p; i++) {
786 GET_UTF8(code, *p++, continue;);
788 /* skip new line chars, just go to new line */
789 if (code == '\n' || code == '\r' || code == '\t')
793 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
795 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
796 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
797 return AVERROR(EINVAL);
799 x1 = s->positions[i].x+s->x+x;
800 y1 = s->positions[i].y+s->y+y;
802 ff_blend_mask(&s->dc, color,
803 frame->data, frame->linesize, width, height,
804 glyph->bitmap.buffer, glyph->bitmap.pitch,
805 glyph->bitmap.width, glyph->bitmap.rows,
806 glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
813 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
814 int width, int height)
816 DrawTextContext *s = ctx->priv;
817 AVFilterLink *inlink = ctx->inputs[0];
819 uint32_t code = 0, prev_code = 0;
820 int x = 0, y = 0, i = 0, ret;
821 int max_text_line_w = 0, len;
823 char *text = s->text;
825 int y_min = 32000, y_max = -32000;
826 int x_min = 32000, x_max = -32000;
828 Glyph *glyph = NULL, *prev_glyph = NULL;
831 time_t now = time(0);
833 AVBPrint *bp = &s->expanded_text;
837 if(s->basetime != AV_NOPTS_VALUE)
838 now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
840 switch (s->exp_mode) {
842 av_bprintf(bp, "%s", s->text);
845 if ((ret = expand_text(ctx)) < 0)
849 localtime_r(&now, <ime);
850 av_bprint_strftime(bp, s->text, <ime);
854 if (s->tc_opt_string) {
855 char tcbuf[AV_TIMECODE_STR_SIZE];
856 av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
858 av_bprintf(bp, "%s%s", s->text, tcbuf);
861 if (!av_bprint_is_complete(bp))
862 return AVERROR(ENOMEM);
863 text = s->expanded_text.str;
864 if ((len = s->expanded_text.len) > s->nb_positions) {
866 av_realloc(s->positions, len*sizeof(*s->positions))))
867 return AVERROR(ENOMEM);
868 s->nb_positions = len;
874 /* load and cache glyphs */
875 for (i = 0, p = text; *p; i++) {
876 GET_UTF8(code, *p++, continue;);
880 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
882 load_glyph(ctx, &glyph, code);
885 y_min = FFMIN(glyph->bbox.yMin, y_min);
886 y_max = FFMAX(glyph->bbox.yMax, y_max);
887 x_min = FFMIN(glyph->bbox.xMin, x_min);
888 x_max = FFMAX(glyph->bbox.xMax, x_max);
890 s->max_glyph_h = y_max - y_min;
891 s->max_glyph_w = x_max - x_min;
893 /* compute and save position for each glyph */
895 for (i = 0, p = text; *p; i++) {
896 GET_UTF8(code, *p++, continue;);
898 /* skip the \n in the sequence \r\n */
899 if (prev_code == '\r' && code == '\n')
903 if (is_newline(code)) {
905 max_text_line_w = FFMAX(max_text_line_w, x);
914 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
917 if (s->use_kerning && prev_glyph && glyph->code) {
918 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
919 ft_kerning_default, &delta);
924 s->positions[i].x = x + glyph->bitmap_left;
925 s->positions[i].y = y - glyph->bitmap_top + y_max;
926 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
927 else x += glyph->advance;
930 max_text_line_w = FFMAX(x, max_text_line_w);
932 s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
933 s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
935 s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
936 s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
937 s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
938 s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
940 s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
942 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
943 s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
944 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
945 s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);
950 box_w = FFMIN(width - 1 , max_text_line_w);
951 box_h = FFMIN(height - 1, y + s->max_glyph_h);
955 ff_blend_rectangle(&s->dc, &s->boxcolor,
956 frame->data, frame->linesize, width, height,
957 s->x, s->y, box_w, box_h);
959 if (s->shadowx || s->shadowy) {
960 if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba,
961 &s->shadowcolor, s->shadowx, s->shadowy)) < 0)
965 if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba,
966 &s->fontcolor, 0, 0)) < 0)
972 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
974 AVFilterContext *ctx = inlink->dst;
975 AVFilterLink *outlink = ctx->outputs[0];
976 DrawTextContext *s = ctx->priv;
980 if ((ret = load_textfile(ctx)) < 0)
983 s->var_values[VAR_N] = inlink->frame_count+s->start_number;
984 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
985 NAN : frame->pts * av_q2d(inlink->time_base);
987 s->var_values[VAR_PICT_TYPE] = frame->pict_type;
989 draw_text(ctx, frame, frame->width, frame->height);
991 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
992 (int)s->var_values[VAR_N], s->var_values[VAR_T],
993 (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
996 return ff_filter_frame(outlink, frame);
999 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1002 .type = AVMEDIA_TYPE_VIDEO,
1003 .get_video_buffer = ff_null_get_video_buffer,
1004 .filter_frame = filter_frame,
1005 .config_props = config_input,
1006 .needs_writable = 1,
1011 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1014 .type = AVMEDIA_TYPE_VIDEO,
1019 AVFilter avfilter_vf_drawtext = {
1021 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1022 .priv_size = sizeof(DrawTextContext),
1023 .priv_class = &drawtext_class,
1026 .query_formats = query_formats,
1028 .inputs = avfilter_vf_drawtext_inputs,
1029 .outputs = avfilter_vf_drawtext_outputs,
1030 .process_command = command,