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
34 #include <sys/types.h>
42 #if CONFIG_LIBFONTCONFIG
43 #include <fontconfig/fontconfig.h>
46 #include "libavutil/avstring.h"
47 #include "libavutil/bprint.h"
48 #include "libavutil/common.h"
49 #include "libavutil/file.h"
50 #include "libavutil/eval.h"
51 #include "libavutil/opt.h"
52 #include "libavutil/random_seed.h"
53 #include "libavutil/parseutils.h"
54 #include "libavutil/timecode.h"
55 #include "libavutil/time_internal.h"
56 #include "libavutil/tree.h"
57 #include "libavutil/lfg.h"
59 #include "drawutils.h"
69 #include FT_FREETYPE_H
73 static const char *const var_names[] = {
76 "line_h", "lh", ///< line height, same as max_glyph_h
77 "main_h", "h", "H", ///< height of the input video
78 "main_w", "w", "W", ///< width of the input video
79 "max_glyph_a", "ascent", ///< max glyph ascent
80 "max_glyph_d", "descent", ///< min glyph descent
81 "max_glyph_h", ///< max glyph height
82 "max_glyph_w", ///< max glyph width
83 "n", ///< number of frame
85 "t", ///< timestamp expressed in seconds
86 "text_h", "th", ///< height of the rendered text
87 "text_w", "tw", ///< width of the rendered text
94 static const char *const fun2_names[] = {
98 static double drand(void *opaque, double min, double max)
100 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
103 typedef double (*eval_func2)(void *, double a, double b);
105 static const eval_func2 fun2[] = {
114 VAR_MAIN_H, VAR_h, VAR_H,
115 VAR_MAIN_W, VAR_w, VAR_W,
116 VAR_MAX_GLYPH_A, VAR_ASCENT,
117 VAR_MAX_GLYPH_D, VAR_DESCENT,
131 enum expansion_mode {
137 typedef struct DrawTextContext {
138 const AVClass *class;
139 int exp_mode; ///< expansion mode to use for the text
140 int reinit; ///< tells if the filter is being reinited
141 #if CONFIG_LIBFONTCONFIG
142 uint8_t *font; ///< font to be used
144 uint8_t *fontfile; ///< font to be used
145 uint8_t *text; ///< text to be drawn
146 AVBPrint expanded_text; ///< used to contain the expanded text
147 uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate
148 AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec
149 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
150 FT_Vector *positions; ///< positions for each element in the text
151 size_t nb_positions; ///< number of elements of positions array
152 char *textfile; ///< file with text to be drawn
153 int x; ///< x position to start drawing text
154 int y; ///< y position to start drawing text
155 int max_glyph_w; ///< max glyph width
156 int max_glyph_h; ///< max glyph height
157 int shadowx, shadowy;
158 int borderw; ///< border width
159 unsigned int fontsize; ///< font size to use
161 short int draw_box; ///< draw box around text - true or false
162 int boxborderw; ///< box border width
163 int use_kerning; ///< font kerning is used - true/false
164 int tabsize; ///< tab size
165 int fix_bounds; ///< do we let it go out of frame bounds - t/f
168 FFDrawColor fontcolor; ///< foreground color
169 FFDrawColor shadowcolor; ///< shadow color
170 FFDrawColor bordercolor; ///< border color
171 FFDrawColor boxcolor; ///< background color
173 FT_Library library; ///< freetype font library handle
174 FT_Face face; ///< freetype font face handle
175 FT_Stroker stroker; ///< freetype stroker handle
176 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
177 char *x_expr; ///< expression for x position
178 char *y_expr; ///< expression for y position
179 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
180 int64_t basetime; ///< base pts time in the real world for display
181 double var_values[VAR_VARS_NB];
185 AVLFG prng; ///< random
186 char *tc_opt_string; ///< specified timecode option string
187 AVRational tc_rate; ///< frame rate for timecode
188 AVTimecode tc; ///< timecode context
189 int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
190 int reload; ///< reload text file for each frame
191 int start_number; ///< starting frame number for n/frame_num var
192 #if CONFIG_LIBFRIBIDI
193 int text_shaping; ///< 1 to shape the text before drawing it
195 AVDictionary *metadata;
198 #define OFFSET(x) offsetof(DrawTextContext, x)
199 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
201 static const AVOption drawtext_options[]= {
202 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
203 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
204 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
205 {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
206 {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS},
207 {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
208 {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
209 {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
210 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
211 {"boxborderw", "set box border width", OFFSET(boxborderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
212 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
213 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
214 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
215 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
216 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
217 {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
218 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
219 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
220 #if CONFIG_LIBFONTCONFIG
221 { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
224 {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
225 {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
226 {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
227 {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
229 {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
230 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
231 {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
232 {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
233 {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
234 {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
235 { "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
236 {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
237 {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
239 #if CONFIG_LIBFRIBIDI
240 {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
243 /* FT_LOAD_* flags */
244 { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, "ft_load_flags" },
245 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
246 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
247 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
248 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
249 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
250 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
251 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
252 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
253 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
254 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
255 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
256 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
257 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
258 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
259 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
263 AVFILTER_DEFINE_CLASS(drawtext);
265 #undef __FTERRORS_H__
266 #define FT_ERROR_START_LIST {
267 #define FT_ERRORDEF(e, v, s) { (e), (s) },
268 #define FT_ERROR_END_LIST { 0, NULL } };
270 static const struct ft_error
277 #define FT_ERRMSG(e) ft_errors[e].err_msg
279 typedef struct Glyph {
281 FT_Glyph border_glyph;
283 FT_Bitmap bitmap; ///< array holding bitmaps of font
284 FT_Bitmap border_bitmap; ///< array holding bitmaps of font border
291 static int glyph_cmp(void *key, const void *b)
293 const Glyph *a = key, *bb = b;
294 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
295 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
299 * Load glyphs corresponding to the UTF-32 codepoint code.
301 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
303 DrawTextContext *s = ctx->priv;
304 FT_BitmapGlyph bitmapglyph;
306 struct AVTreeNode *node = NULL;
309 /* load glyph into s->face->glyph */
310 if (FT_Load_Char(s->face, code, s->ft_load_flags))
311 return AVERROR(EINVAL);
313 glyph = av_mallocz(sizeof(*glyph));
315 ret = AVERROR(ENOMEM);
320 if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {
321 ret = AVERROR(EINVAL);
325 glyph->border_glyph = glyph->glyph;
326 if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||
327 FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
328 ret = AVERROR_EXTERNAL;
331 bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;
332 glyph->border_bitmap = bitmapglyph->bitmap;
334 if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
335 ret = AVERROR_EXTERNAL;
338 bitmapglyph = (FT_BitmapGlyph) glyph->glyph;
340 glyph->bitmap = bitmapglyph->bitmap;
341 glyph->bitmap_left = bitmapglyph->left;
342 glyph->bitmap_top = bitmapglyph->top;
343 glyph->advance = s->face->glyph->advance.x >> 6;
345 /* measure text height to calculate text_height (or the maximum text height) */
346 FT_Glyph_Get_CBox(glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
348 /* cache the newly created glyph */
349 if (!(node = av_tree_node_alloc())) {
350 ret = AVERROR(ENOMEM);
353 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
361 av_freep(&glyph->glyph);
368 static int load_font_file(AVFilterContext *ctx, const char *path, int index)
370 DrawTextContext *s = ctx->priv;
373 err = FT_New_Face(s->library, path, index, &s->face);
375 av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
376 s->fontfile, FT_ERRMSG(err));
377 return AVERROR(EINVAL);
382 #if CONFIG_LIBFONTCONFIG
383 static int load_font_fontconfig(AVFilterContext *ctx)
385 DrawTextContext *s = ctx->priv;
386 FcConfig *fontconfig;
387 FcPattern *pat, *best;
388 FcResult result = FcResultMatch;
392 int err = AVERROR(ENOENT);
394 fontconfig = FcInitLoadConfigAndFonts();
396 av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
397 return AVERROR_UNKNOWN;
399 pat = FcNameParse(s->fontfile ? s->fontfile :
400 (uint8_t *)(intptr_t)"default");
402 av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
403 return AVERROR(EINVAL);
406 FcPatternAddString(pat, FC_FAMILY, s->font);
408 FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
410 FcDefaultSubstitute(pat);
412 if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
413 av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
414 FcPatternDestroy(pat);
415 return AVERROR(ENOMEM);
418 best = FcFontMatch(fontconfig, pat, &result);
419 FcPatternDestroy(pat);
421 if (!best || result != FcResultMatch) {
422 av_log(ctx, AV_LOG_ERROR,
423 "Cannot find a valid font for the family %s\n",
429 FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
430 FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
431 av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
432 return AVERROR(EINVAL);
435 if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
436 av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
441 av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
443 s->fontsize = size + 0.5;
445 err = load_font_file(ctx, filename, index);
448 FcConfigDestroy(fontconfig);
450 FcPatternDestroy(best);
455 static int load_font(AVFilterContext *ctx)
457 DrawTextContext *s = ctx->priv;
460 /* load the face, and set up the encoding, which is by default UTF-8 */
461 err = load_font_file(ctx, s->fontfile, 0);
464 #if CONFIG_LIBFONTCONFIG
465 err = load_font_fontconfig(ctx);
472 static int load_textfile(AVFilterContext *ctx)
474 DrawTextContext *s = ctx->priv;
480 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
481 av_log(ctx, AV_LOG_ERROR,
482 "The text file '%s' could not be read or is empty\n",
487 if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) {
488 av_file_unmap(textbuf, textbuf_size);
489 return AVERROR(ENOMEM);
492 memcpy(s->text, textbuf, textbuf_size);
493 s->text[textbuf_size] = 0;
494 av_file_unmap(textbuf, textbuf_size);
499 static inline int is_newline(uint32_t c)
501 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
504 #if CONFIG_LIBFRIBIDI
505 static int shape_text(AVFilterContext *ctx)
507 DrawTextContext *s = ctx->priv;
509 int ret = AVERROR(ENOMEM);
510 static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |
511 FRIBIDI_FLAGS_ARABIC;
512 FriBidiChar *unicodestr = NULL;
514 FriBidiParType direction = FRIBIDI_PAR_LTR;
515 FriBidiStrIndex line_start = 0;
516 FriBidiStrIndex line_end = 0;
517 FriBidiLevel *embedding_levels = NULL;
518 FriBidiArabicProp *ar_props = NULL;
519 FriBidiCharType *bidi_types = NULL;
522 len = strlen(s->text);
523 if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) {
526 len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,
527 s->text, len, unicodestr);
529 bidi_types = av_malloc_array(len, sizeof(*bidi_types));
534 fribidi_get_bidi_types(unicodestr, len, bidi_types);
536 embedding_levels = av_malloc_array(len, sizeof(*embedding_levels));
537 if (!embedding_levels) {
541 if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction,
546 ar_props = av_malloc_array(len, sizeof(*ar_props));
551 fribidi_get_joining_types(unicodestr, len, ar_props);
552 fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props);
553 fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr);
555 for (line_end = 0, line_start = 0; line_end < len; line_end++) {
556 if (is_newline(unicodestr[line_end]) || line_end == len - 1) {
557 if (!fribidi_reorder_line(flags, bidi_types,
558 line_end - line_start + 1, line_start,
559 direction, embedding_levels, unicodestr,
563 line_start = line_end + 1;
567 /* Remove zero-width fill chars put in by libfribidi */
568 for (i = 0, j = 0; i < len; i++)
569 if (unicodestr[i] != FRIBIDI_CHAR_FILL)
570 unicodestr[j++] = unicodestr[i];
573 if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) {
574 /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */
579 len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,
580 unicodestr, len, s->text);
585 av_free(embedding_levels);
592 static av_cold int init(AVFilterContext *ctx)
595 DrawTextContext *s = ctx->priv;
598 if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
599 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
600 return AVERROR(EINVAL);
605 av_log(ctx, AV_LOG_ERROR,
606 "Both text and text file provided. Please provide only one\n");
607 return AVERROR(EINVAL);
609 if ((err = load_textfile(ctx)) < 0)
613 #if CONFIG_LIBFRIBIDI
615 if ((err = shape_text(ctx)) < 0)
619 if (s->reload && !s->textfile)
620 av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
622 if (s->tc_opt_string) {
623 int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
624 s->tc_opt_string, ctx);
628 s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
630 s->text = av_strdup("");
634 av_log(ctx, AV_LOG_ERROR,
635 "Either text, a valid file or a timecode must be provided\n");
636 return AVERROR(EINVAL);
639 if ((err = FT_Init_FreeType(&(s->library)))) {
640 av_log(ctx, AV_LOG_ERROR,
641 "Could not load FreeType: %s\n", FT_ERRMSG(err));
642 return AVERROR(EINVAL);
645 err = load_font(ctx);
650 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
651 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
652 s->fontsize, FT_ERRMSG(err));
653 return AVERROR(EINVAL);
657 if (FT_Stroker_New(s->library, &s->stroker)) {
658 av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");
659 return AVERROR_EXTERNAL;
661 FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
662 FT_STROKER_LINEJOIN_ROUND, 0);
665 s->use_kerning = FT_HAS_KERNING(s->face);
667 /* load the fallback glyph with code 0 */
668 load_glyph(ctx, NULL, 0);
670 /* set the tabsize in pixels */
671 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
672 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
675 s->tabsize *= glyph->advance;
677 if (s->exp_mode == EXP_STRFTIME &&
678 (strchr(s->text, '%') || strchr(s->text, '\\')))
679 av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
681 av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
682 av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED);
687 static int query_formats(AVFilterContext *ctx)
689 return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
692 static int glyph_enu_free(void *opaque, void *elem)
696 FT_Done_Glyph(glyph->glyph);
697 FT_Done_Glyph(glyph->border_glyph);
702 static av_cold void uninit(AVFilterContext *ctx)
704 DrawTextContext *s = ctx->priv;
706 av_expr_free(s->x_pexpr);
707 av_expr_free(s->y_pexpr);
708 s->x_pexpr = s->y_pexpr = NULL;
709 av_freep(&s->positions);
713 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
714 av_tree_destroy(s->glyphs);
717 FT_Done_Face(s->face);
718 FT_Stroker_Done(s->stroker);
719 FT_Done_FreeType(s->library);
721 av_bprint_finalize(&s->expanded_text, NULL);
722 av_bprint_finalize(&s->expanded_fontcolor, NULL);
725 static int config_input(AVFilterLink *inlink)
727 AVFilterContext *ctx = inlink->dst;
728 DrawTextContext *s = ctx->priv;
731 ff_draw_init(&s->dc, inlink->format, 0);
732 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
733 ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
734 ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
735 ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
737 s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
738 s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
739 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
740 s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
741 s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
742 s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
743 s->var_values[VAR_X] = NAN;
744 s->var_values[VAR_Y] = NAN;
745 s->var_values[VAR_T] = NAN;
747 av_lfg_init(&s->prng, av_get_random_seed());
749 av_expr_free(s->x_pexpr);
750 av_expr_free(s->y_pexpr);
751 s->x_pexpr = s->y_pexpr = NULL;
753 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
754 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
755 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
756 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
757 (ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names,
758 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
760 return AVERROR(EINVAL);
765 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
767 DrawTextContext *s = ctx->priv;
769 if (!strcmp(cmd, "reinit")) {
773 if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
775 if ((ret = init(ctx)) < 0)
777 return config_input(ctx->inputs[0]);
780 return AVERROR(ENOSYS);
783 static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
784 char *fct, unsigned argc, char **argv, int tag)
786 DrawTextContext *s = ctx->priv;
788 av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
792 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
793 char *fct, unsigned argc, char **argv, int tag)
795 DrawTextContext *s = ctx->priv;
797 double pts = s->var_values[VAR_T];
800 fmt = argc >= 1 ? argv[0] : "flt";
803 if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
804 av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
807 pts += (double)delta / AV_TIME_BASE;
809 if (!strcmp(fmt, "flt")) {
810 av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
811 } else if (!strcmp(fmt, "hms")) {
813 av_bprintf(bp, " ??:??:??.???");
815 int64_t ms = round(pts * 1000);
821 av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
822 (int)(ms / (60 * 60 * 1000)),
823 (int)(ms / (60 * 1000)) % 60,
824 (int)(ms / 1000) % 60,
828 av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
829 return AVERROR(EINVAL);
834 static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
835 char *fct, unsigned argc, char **argv, int tag)
837 DrawTextContext *s = ctx->priv;
839 av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
843 static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
844 char *fct, unsigned argc, char **argv, int tag)
846 DrawTextContext *s = ctx->priv;
847 AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
850 av_bprintf(bp, "%s", e->value);
854 static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
855 char *fct, unsigned argc, char **argv, int tag)
857 const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
863 localtime_r(&now, &tm);
865 tm = *gmtime_r(&now, &tm);
866 av_bprint_strftime(bp, fmt, &tm);
870 static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
871 char *fct, unsigned argc, char **argv, int tag)
873 DrawTextContext *s = ctx->priv;
877 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
878 NULL, NULL, fun2_names, fun2,
881 av_log(ctx, AV_LOG_ERROR,
882 "Expression '%s' for the expr text expansion function is not valid\n",
885 av_bprintf(bp, "%f", res);
890 static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,
891 char *fct, unsigned argc, char **argv, int tag)
893 DrawTextContext *s = ctx->priv;
897 unsigned int positions = 0;
898 char fmt_str[30] = "%";
901 * argv[0] expression to be converted to `int`
902 * argv[1] format: 'x', 'X', 'd' or 'u'
903 * argv[2] positions printed (optional)
906 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
907 NULL, NULL, fun2_names, fun2,
910 av_log(ctx, AV_LOG_ERROR,
911 "Expression '%s' for the expr text expansion function is not valid\n",
916 if (!strchr("xXdu", argv[1][0])) {
917 av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
918 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
919 return AVERROR(EINVAL);
923 ret = sscanf(argv[2], "%u", &positions);
925 av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
926 " to print: '%s'\n", argv[2]);
927 return AVERROR(EINVAL);
931 feclearexcept(FE_ALL_EXCEPT);
933 if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
934 av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
935 return AVERROR(EINVAL);
939 av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
940 av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
942 av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
943 res, argv[0], fmt_str);
945 av_bprintf(bp, fmt_str, intval);
950 static const struct drawtext_function {
952 unsigned argc_min, argc_max;
953 int tag; /**< opaque argument to func */
954 int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
956 { "expr", 1, 1, 0, func_eval_expr },
957 { "e", 1, 1, 0, func_eval_expr },
958 { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
959 { "eif", 2, 3, 0, func_eval_expr_int_format },
960 { "pict_type", 0, 0, 0, func_pict_type },
961 { "pts", 0, 2, 0, func_pts },
962 { "gmtime", 0, 1, 'G', func_strftime },
963 { "localtime", 0, 1, 'L', func_strftime },
964 { "frame_num", 0, 0, 0, func_frame_num },
965 { "n", 0, 0, 0, func_frame_num },
966 { "metadata", 1, 1, 0, func_metadata },
969 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
970 unsigned argc, char **argv)
974 for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
975 if (strcmp(fct, functions[i].name))
977 if (argc < functions[i].argc_min) {
978 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
979 fct, functions[i].argc_min);
980 return AVERROR(EINVAL);
982 if (argc > functions[i].argc_max) {
983 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
984 fct, functions[i].argc_max);
985 return AVERROR(EINVAL);
989 if (i >= FF_ARRAY_ELEMS(functions)) {
990 av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
991 return AVERROR(EINVAL);
993 return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
996 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
998 const char *text = *rtext;
999 char *argv[16] = { NULL };
1000 unsigned argc = 0, i;
1004 av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
1005 return AVERROR(EINVAL);
1009 if (!(argv[argc++] = av_get_token(&text, ":}"))) {
1010 ret = AVERROR(ENOMEM);
1014 av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
1015 ret = AVERROR(EINVAL);
1018 if (argc == FF_ARRAY_ELEMS(argv))
1019 av_freep(&argv[--argc]); /* error will be caught later */
1025 if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
1028 *rtext = (char *)text + 1;
1031 for (i = 0; i < argc; i++)
1036 static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
1040 av_bprint_clear(bp);
1042 if (*text == '\\' && text[1]) {
1043 av_bprint_chars(bp, text[1], 1);
1045 } else if (*text == '%') {
1047 if ((ret = expand_function(ctx, bp, &text)) < 0)
1050 av_bprint_chars(bp, *text, 1);
1054 if (!av_bprint_is_complete(bp))
1055 return AVERROR(ENOMEM);
1059 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
1060 int width, int height,
1062 int x, int y, int borderw)
1064 char *text = s->expanded_text.str;
1068 Glyph *glyph = NULL;
1070 for (i = 0, p = text; *p; i++) {
1072 Glyph dummy = { 0 };
1073 GET_UTF8(code, *p++, continue;);
1075 /* skip new line chars, just go to new line */
1076 if (code == '\n' || code == '\r' || code == '\t')
1080 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
1082 bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
1084 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
1085 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
1086 return AVERROR(EINVAL);
1088 x1 = s->positions[i].x+s->x+x - borderw;
1089 y1 = s->positions[i].y+s->y+y - borderw;
1091 ff_blend_mask(&s->dc, color,
1092 frame->data, frame->linesize, width, height,
1093 bitmap.buffer, bitmap.pitch,
1094 bitmap.width, bitmap.rows,
1095 bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
1103 static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)
1106 color->rgba[3] = (color->rgba[3] * s->alpha) / 255;
1107 ff_draw_color(&s->dc, color, color->rgba);
1110 static void update_alpha(DrawTextContext *s)
1112 double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);
1119 else if (alpha <= 0)
1122 s->alpha = 256 * alpha;
1125 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
1126 int width, int height)
1128 DrawTextContext *s = ctx->priv;
1129 AVFilterLink *inlink = ctx->inputs[0];
1131 uint32_t code = 0, prev_code = 0;
1132 int x = 0, y = 0, i = 0, ret;
1133 int max_text_line_w = 0, len;
1137 int y_min = 32000, y_max = -32000;
1138 int x_min = 32000, x_max = -32000;
1140 Glyph *glyph = NULL, *prev_glyph = NULL;
1141 Glyph dummy = { 0 };
1143 time_t now = time(0);
1145 AVBPrint *bp = &s->expanded_text;
1147 FFDrawColor fontcolor;
1148 FFDrawColor shadowcolor;
1149 FFDrawColor bordercolor;
1150 FFDrawColor boxcolor;
1152 av_bprint_clear(bp);
1154 if(s->basetime != AV_NOPTS_VALUE)
1155 now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
1157 switch (s->exp_mode) {
1159 av_bprintf(bp, "%s", s->text);
1162 if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
1166 localtime_r(&now, <ime);
1167 av_bprint_strftime(bp, s->text, <ime);
1171 if (s->tc_opt_string) {
1172 char tcbuf[AV_TIMECODE_STR_SIZE];
1173 av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
1174 av_bprint_clear(bp);
1175 av_bprintf(bp, "%s%s", s->text, tcbuf);
1178 if (!av_bprint_is_complete(bp))
1179 return AVERROR(ENOMEM);
1180 text = s->expanded_text.str;
1181 if ((len = s->expanded_text.len) > s->nb_positions) {
1182 if (!(s->positions =
1183 av_realloc(s->positions, len*sizeof(*s->positions))))
1184 return AVERROR(ENOMEM);
1185 s->nb_positions = len;
1188 if (s->fontcolor_expr[0]) {
1189 /* If expression is set, evaluate and replace the static value */
1190 av_bprint_clear(&s->expanded_fontcolor);
1191 if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
1193 if (!av_bprint_is_complete(&s->expanded_fontcolor))
1194 return AVERROR(ENOMEM);
1195 av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);
1196 ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);
1199 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
1205 /* load and cache glyphs */
1206 for (i = 0, p = text; *p; i++) {
1207 GET_UTF8(code, *p++, continue;);
1211 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1213 load_glyph(ctx, &glyph, code);
1216 y_min = FFMIN(glyph->bbox.yMin, y_min);
1217 y_max = FFMAX(glyph->bbox.yMax, y_max);
1218 x_min = FFMIN(glyph->bbox.xMin, x_min);
1219 x_max = FFMAX(glyph->bbox.xMax, x_max);
1221 s->max_glyph_h = y_max - y_min;
1222 s->max_glyph_w = x_max - x_min;
1224 /* compute and save position for each glyph */
1226 for (i = 0, p = text; *p; i++) {
1227 GET_UTF8(code, *p++, continue;);
1229 /* skip the \n in the sequence \r\n */
1230 if (prev_code == '\r' && code == '\n')
1234 if (is_newline(code)) {
1236 max_text_line_w = FFMAX(max_text_line_w, x);
1237 y += s->max_glyph_h;
1245 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1248 if (s->use_kerning && prev_glyph && glyph->code) {
1249 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1250 ft_kerning_default, &delta);
1255 s->positions[i].x = x + glyph->bitmap_left;
1256 s->positions[i].y = y - glyph->bitmap_top + y_max;
1257 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1258 else x += glyph->advance;
1261 max_text_line_w = FFMAX(x, max_text_line_w);
1263 s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1264 s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1266 s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1267 s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1268 s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1269 s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1271 s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1273 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1274 s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1275 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1278 update_color_with_alpha(s, &fontcolor , s->fontcolor );
1279 update_color_with_alpha(s, &shadowcolor, s->shadowcolor);
1280 update_color_with_alpha(s, &bordercolor, s->bordercolor);
1281 update_color_with_alpha(s, &boxcolor , s->boxcolor );
1283 box_w = FFMIN(width - 1 , max_text_line_w);
1284 box_h = FFMIN(height - 1, y + s->max_glyph_h);
1288 ff_blend_rectangle(&s->dc, &boxcolor,
1289 frame->data, frame->linesize, width, height,
1290 s->x - s->boxborderw, s->y - s->boxborderw,
1291 box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);
1293 if (s->shadowx || s->shadowy) {
1294 if ((ret = draw_glyphs(s, frame, width, height,
1295 &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1300 if ((ret = draw_glyphs(s, frame, width, height,
1301 &bordercolor, 0, 0, s->borderw)) < 0)
1304 if ((ret = draw_glyphs(s, frame, width, height,
1305 &fontcolor, 0, 0, 0)) < 0)
1311 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
1313 AVFilterContext *ctx = inlink->dst;
1314 AVFilterLink *outlink = ctx->outputs[0];
1315 DrawTextContext *s = ctx->priv;
1319 if ((ret = load_textfile(ctx)) < 0) {
1320 av_frame_free(&frame);
1323 #if CONFIG_LIBFRIBIDI
1324 if (s->text_shaping)
1325 if ((ret = shape_text(ctx)) < 0) {
1326 av_frame_free(&frame);
1332 s->var_values[VAR_N] = inlink->frame_count+s->start_number;
1333 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1334 NAN : frame->pts * av_q2d(inlink->time_base);
1336 s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1337 s->metadata = av_frame_get_metadata(frame);
1339 draw_text(ctx, frame, frame->width, frame->height);
1341 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1342 (int)s->var_values[VAR_N], s->var_values[VAR_T],
1343 (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1346 return ff_filter_frame(outlink, frame);
1349 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1352 .type = AVMEDIA_TYPE_VIDEO,
1353 .filter_frame = filter_frame,
1354 .config_props = config_input,
1355 .needs_writable = 1,
1360 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1363 .type = AVMEDIA_TYPE_VIDEO,
1368 AVFilter ff_vf_drawtext = {
1370 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1371 .priv_size = sizeof(DrawTextContext),
1372 .priv_class = &drawtext_class,
1375 .query_formats = query_formats,
1376 .inputs = avfilter_vf_drawtext_inputs,
1377 .outputs = avfilter_vf_drawtext_outputs,
1378 .process_command = command,
1379 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,