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 int line_spacing; ///< lines spacing in pixels
162 short int draw_box; ///< draw box around text - true or false
163 int boxborderw; ///< box border width
164 int use_kerning; ///< font kerning is used - true/false
165 int tabsize; ///< tab size
166 int fix_bounds; ///< do we let it go out of frame bounds - t/f
169 FFDrawColor fontcolor; ///< foreground color
170 FFDrawColor shadowcolor; ///< shadow color
171 FFDrawColor bordercolor; ///< border color
172 FFDrawColor boxcolor; ///< background color
174 FT_Library library; ///< freetype font library handle
175 FT_Face face; ///< freetype font face handle
176 FT_Stroker stroker; ///< freetype stroker handle
177 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
178 char *x_expr; ///< expression for x position
179 char *y_expr; ///< expression for y position
180 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
181 int64_t basetime; ///< base pts time in the real world for display
182 double var_values[VAR_VARS_NB];
186 AVLFG prng; ///< random
187 char *tc_opt_string; ///< specified timecode option string
188 AVRational tc_rate; ///< frame rate for timecode
189 AVTimecode tc; ///< timecode context
190 int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
191 int reload; ///< reload text file for each frame
192 int start_number; ///< starting frame number for n/frame_num var
193 #if CONFIG_LIBFRIBIDI
194 int text_shaping; ///< 1 to shape the text before drawing it
196 AVDictionary *metadata;
199 #define OFFSET(x) offsetof(DrawTextContext, x)
200 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
202 static const AVOption drawtext_options[]= {
203 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
204 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
205 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
206 {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
207 {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS},
208 {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
209 {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
210 {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
211 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 , FLAGS},
212 {"boxborderw", "set box border width", OFFSET(boxborderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
213 {"line_spacing", "set line spacing in pixels", OFFSET(line_spacing), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX,FLAGS},
214 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
215 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
216 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
217 {"shadowx", "set shadow x offset", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
218 {"shadowy", "set shadow y offset", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
219 {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
220 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
221 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
222 #if CONFIG_LIBFONTCONFIG
223 { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
226 {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
227 {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
228 {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
229 {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
231 {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
232 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
233 {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
234 {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
235 {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
236 {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
237 { "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
238 {"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
239 {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
241 #if CONFIG_LIBFRIBIDI
242 {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
245 /* FT_LOAD_* flags */
246 { "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" },
247 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
248 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
249 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
250 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
251 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
252 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
253 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
254 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
255 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
256 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
257 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
258 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
259 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
260 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
261 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
265 AVFILTER_DEFINE_CLASS(drawtext);
267 #undef __FTERRORS_H__
268 #define FT_ERROR_START_LIST {
269 #define FT_ERRORDEF(e, v, s) { (e), (s) },
270 #define FT_ERROR_END_LIST { 0, NULL } };
272 static const struct ft_error
279 #define FT_ERRMSG(e) ft_errors[e].err_msg
281 typedef struct Glyph {
283 FT_Glyph border_glyph;
285 FT_Bitmap bitmap; ///< array holding bitmaps of font
286 FT_Bitmap border_bitmap; ///< array holding bitmaps of font border
293 static int glyph_cmp(const void *key, const void *b)
295 const Glyph *a = key, *bb = b;
296 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
297 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
301 * Load glyphs corresponding to the UTF-32 codepoint code.
303 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
305 DrawTextContext *s = ctx->priv;
306 FT_BitmapGlyph bitmapglyph;
308 struct AVTreeNode *node = NULL;
311 /* load glyph into s->face->glyph */
312 if (FT_Load_Char(s->face, code, s->ft_load_flags))
313 return AVERROR(EINVAL);
315 glyph = av_mallocz(sizeof(*glyph));
317 ret = AVERROR(ENOMEM);
322 if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {
323 ret = AVERROR(EINVAL);
327 glyph->border_glyph = glyph->glyph;
328 if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||
329 FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
330 ret = AVERROR_EXTERNAL;
333 bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;
334 glyph->border_bitmap = bitmapglyph->bitmap;
336 if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
337 ret = AVERROR_EXTERNAL;
340 bitmapglyph = (FT_BitmapGlyph) glyph->glyph;
342 glyph->bitmap = bitmapglyph->bitmap;
343 glyph->bitmap_left = bitmapglyph->left;
344 glyph->bitmap_top = bitmapglyph->top;
345 glyph->advance = s->face->glyph->advance.x >> 6;
347 /* measure text height to calculate text_height (or the maximum text height) */
348 FT_Glyph_Get_CBox(glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
350 /* cache the newly created glyph */
351 if (!(node = av_tree_node_alloc())) {
352 ret = AVERROR(ENOMEM);
355 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
363 av_freep(&glyph->glyph);
370 static int load_font_file(AVFilterContext *ctx, const char *path, int index)
372 DrawTextContext *s = ctx->priv;
375 err = FT_New_Face(s->library, path, index, &s->face);
377 #if !CONFIG_LIBFONTCONFIG
378 av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
379 s->fontfile, FT_ERRMSG(err));
381 return AVERROR(EINVAL);
386 #if CONFIG_LIBFONTCONFIG
387 static int load_font_fontconfig(AVFilterContext *ctx)
389 DrawTextContext *s = ctx->priv;
390 FcConfig *fontconfig;
391 FcPattern *pat, *best;
392 FcResult result = FcResultMatch;
396 int err = AVERROR(ENOENT);
398 fontconfig = FcInitLoadConfigAndFonts();
400 av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
401 return AVERROR_UNKNOWN;
403 pat = FcNameParse(s->fontfile ? s->fontfile :
404 (uint8_t *)(intptr_t)"default");
406 av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
407 return AVERROR(EINVAL);
410 FcPatternAddString(pat, FC_FAMILY, s->font);
412 FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
414 FcDefaultSubstitute(pat);
416 if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
417 av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
418 FcPatternDestroy(pat);
419 return AVERROR(ENOMEM);
422 best = FcFontMatch(fontconfig, pat, &result);
423 FcPatternDestroy(pat);
425 if (!best || result != FcResultMatch) {
426 av_log(ctx, AV_LOG_ERROR,
427 "Cannot find a valid font for the family %s\n",
433 FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
434 FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
435 av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
436 return AVERROR(EINVAL);
439 if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
440 av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
445 av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
447 s->fontsize = size + 0.5;
449 err = load_font_file(ctx, filename, index);
452 FcConfigDestroy(fontconfig);
454 FcPatternDestroy(best);
459 static int load_font(AVFilterContext *ctx)
461 DrawTextContext *s = ctx->priv;
464 /* load the face, and set up the encoding, which is by default UTF-8 */
465 err = load_font_file(ctx, s->fontfile, 0);
468 #if CONFIG_LIBFONTCONFIG
469 err = load_font_fontconfig(ctx);
476 static int load_textfile(AVFilterContext *ctx)
478 DrawTextContext *s = ctx->priv;
484 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
485 av_log(ctx, AV_LOG_ERROR,
486 "The text file '%s' could not be read or is empty\n",
491 if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) {
492 av_file_unmap(textbuf, textbuf_size);
493 return AVERROR(ENOMEM);
496 memcpy(s->text, textbuf, textbuf_size);
497 s->text[textbuf_size] = 0;
498 av_file_unmap(textbuf, textbuf_size);
503 static inline int is_newline(uint32_t c)
505 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
508 #if CONFIG_LIBFRIBIDI
509 static int shape_text(AVFilterContext *ctx)
511 DrawTextContext *s = ctx->priv;
513 int ret = AVERROR(ENOMEM);
514 static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |
515 FRIBIDI_FLAGS_ARABIC;
516 FriBidiChar *unicodestr = NULL;
518 FriBidiParType direction = FRIBIDI_PAR_LTR;
519 FriBidiStrIndex line_start = 0;
520 FriBidiStrIndex line_end = 0;
521 FriBidiLevel *embedding_levels = NULL;
522 FriBidiArabicProp *ar_props = NULL;
523 FriBidiCharType *bidi_types = NULL;
526 len = strlen(s->text);
527 if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) {
530 len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,
531 s->text, len, unicodestr);
533 bidi_types = av_malloc_array(len, sizeof(*bidi_types));
538 fribidi_get_bidi_types(unicodestr, len, bidi_types);
540 embedding_levels = av_malloc_array(len, sizeof(*embedding_levels));
541 if (!embedding_levels) {
545 if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction,
550 ar_props = av_malloc_array(len, sizeof(*ar_props));
555 fribidi_get_joining_types(unicodestr, len, ar_props);
556 fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props);
557 fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr);
559 for (line_end = 0, line_start = 0; line_end < len; line_end++) {
560 if (is_newline(unicodestr[line_end]) || line_end == len - 1) {
561 if (!fribidi_reorder_line(flags, bidi_types,
562 line_end - line_start + 1, line_start,
563 direction, embedding_levels, unicodestr,
567 line_start = line_end + 1;
571 /* Remove zero-width fill chars put in by libfribidi */
572 for (i = 0, j = 0; i < len; i++)
573 if (unicodestr[i] != FRIBIDI_CHAR_FILL)
574 unicodestr[j++] = unicodestr[i];
577 if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) {
578 /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */
583 len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,
584 unicodestr, len, s->text);
589 av_free(embedding_levels);
596 static av_cold int init(AVFilterContext *ctx)
599 DrawTextContext *s = ctx->priv;
602 if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
603 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
604 return AVERROR(EINVAL);
609 av_log(ctx, AV_LOG_ERROR,
610 "Both text and text file provided. Please provide only one\n");
611 return AVERROR(EINVAL);
613 if ((err = load_textfile(ctx)) < 0)
617 if (s->reload && !s->textfile)
618 av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
620 if (s->tc_opt_string) {
621 int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
622 s->tc_opt_string, ctx);
626 s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
628 s->text = av_strdup("");
632 av_log(ctx, AV_LOG_ERROR,
633 "Either text, a valid file or a timecode must be provided\n");
634 return AVERROR(EINVAL);
637 #if CONFIG_LIBFRIBIDI
639 if ((err = shape_text(ctx)) < 0)
643 if ((err = FT_Init_FreeType(&(s->library)))) {
644 av_log(ctx, AV_LOG_ERROR,
645 "Could not load FreeType: %s\n", FT_ERRMSG(err));
646 return AVERROR(EINVAL);
649 err = load_font(ctx);
654 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
655 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
656 s->fontsize, FT_ERRMSG(err));
657 return AVERROR(EINVAL);
661 if (FT_Stroker_New(s->library, &s->stroker)) {
662 av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");
663 return AVERROR_EXTERNAL;
665 FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
666 FT_STROKER_LINEJOIN_ROUND, 0);
669 s->use_kerning = FT_HAS_KERNING(s->face);
671 /* load the fallback glyph with code 0 */
672 load_glyph(ctx, NULL, 0);
674 /* set the tabsize in pixels */
675 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
676 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
679 s->tabsize *= glyph->advance;
681 if (s->exp_mode == EXP_STRFTIME &&
682 (strchr(s->text, '%') || strchr(s->text, '\\')))
683 av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
685 av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
686 av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED);
691 static int query_formats(AVFilterContext *ctx)
693 return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
696 static int glyph_enu_free(void *opaque, void *elem)
700 FT_Done_Glyph(glyph->glyph);
701 FT_Done_Glyph(glyph->border_glyph);
706 static av_cold void uninit(AVFilterContext *ctx)
708 DrawTextContext *s = ctx->priv;
710 av_expr_free(s->x_pexpr);
711 av_expr_free(s->y_pexpr);
712 av_expr_free(s->a_pexpr);
713 s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;
714 av_freep(&s->positions);
718 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
719 av_tree_destroy(s->glyphs);
722 FT_Done_Face(s->face);
723 FT_Stroker_Done(s->stroker);
724 FT_Done_FreeType(s->library);
726 av_bprint_finalize(&s->expanded_text, NULL);
727 av_bprint_finalize(&s->expanded_fontcolor, NULL);
730 static int config_input(AVFilterLink *inlink)
732 AVFilterContext *ctx = inlink->dst;
733 DrawTextContext *s = ctx->priv;
736 ff_draw_init(&s->dc, inlink->format, FF_DRAW_PROCESS_ALPHA);
737 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
738 ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
739 ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
740 ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
742 s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
743 s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
744 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
745 s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
746 s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
747 s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
748 s->var_values[VAR_X] = NAN;
749 s->var_values[VAR_Y] = NAN;
750 s->var_values[VAR_T] = NAN;
752 av_lfg_init(&s->prng, av_get_random_seed());
754 av_expr_free(s->x_pexpr);
755 av_expr_free(s->y_pexpr);
756 av_expr_free(s->a_pexpr);
757 s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;
759 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
760 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
761 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
762 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
763 (ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names,
764 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
766 return AVERROR(EINVAL);
771 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
773 DrawTextContext *s = ctx->priv;
775 if (!strcmp(cmd, "reinit")) {
779 if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
781 if ((ret = init(ctx)) < 0)
783 return config_input(ctx->inputs[0]);
786 return AVERROR(ENOSYS);
789 static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
790 char *fct, unsigned argc, char **argv, int tag)
792 DrawTextContext *s = ctx->priv;
794 av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
798 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
799 char *fct, unsigned argc, char **argv, int tag)
801 DrawTextContext *s = ctx->priv;
803 double pts = s->var_values[VAR_T];
806 fmt = argc >= 1 ? argv[0] : "flt";
809 if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
810 av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
813 pts += (double)delta / AV_TIME_BASE;
815 if (!strcmp(fmt, "flt")) {
816 av_bprintf(bp, "%.6f", pts);
817 } else if (!strcmp(fmt, "hms")) {
819 av_bprintf(bp, " ??:??:??.???");
821 int64_t ms = llrint(pts * 1000);
827 av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
828 (int)(ms / (60 * 60 * 1000)),
829 (int)(ms / (60 * 1000)) % 60,
830 (int)(ms / 1000) % 60,
833 } else if (!strcmp(fmt, "localtime") ||
834 !strcmp(fmt, "gmtime")) {
836 time_t ms = (time_t)pts;
837 const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S";
838 if (!strcmp(fmt, "localtime"))
839 localtime_r(&ms, &tm);
842 av_bprint_strftime(bp, timefmt, &tm);
844 av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
845 return AVERROR(EINVAL);
850 static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
851 char *fct, unsigned argc, char **argv, int tag)
853 DrawTextContext *s = ctx->priv;
855 av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
859 static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
860 char *fct, unsigned argc, char **argv, int tag)
862 DrawTextContext *s = ctx->priv;
863 AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
866 av_bprintf(bp, "%s", e->value);
868 av_bprintf(bp, "%s", argv[1]);
872 static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
873 char *fct, unsigned argc, char **argv, int tag)
875 const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
881 localtime_r(&now, &tm);
883 tm = *gmtime_r(&now, &tm);
884 av_bprint_strftime(bp, fmt, &tm);
888 static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
889 char *fct, unsigned argc, char **argv, int tag)
891 DrawTextContext *s = ctx->priv;
895 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
896 NULL, NULL, fun2_names, fun2,
899 av_log(ctx, AV_LOG_ERROR,
900 "Expression '%s' for the expr text expansion function is not valid\n",
903 av_bprintf(bp, "%f", res);
908 static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,
909 char *fct, unsigned argc, char **argv, int tag)
911 DrawTextContext *s = ctx->priv;
915 unsigned int positions = 0;
916 char fmt_str[30] = "%";
919 * argv[0] expression to be converted to `int`
920 * argv[1] format: 'x', 'X', 'd' or 'u'
921 * argv[2] positions printed (optional)
924 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
925 NULL, NULL, fun2_names, fun2,
928 av_log(ctx, AV_LOG_ERROR,
929 "Expression '%s' for the expr text expansion function is not valid\n",
934 if (!strchr("xXdu", argv[1][0])) {
935 av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
936 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
937 return AVERROR(EINVAL);
941 ret = sscanf(argv[2], "%u", &positions);
943 av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
944 " to print: '%s'\n", argv[2]);
945 return AVERROR(EINVAL);
949 feclearexcept(FE_ALL_EXCEPT);
951 if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
952 av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
953 return AVERROR(EINVAL);
957 av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
958 av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
960 av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
961 res, argv[0], fmt_str);
963 av_bprintf(bp, fmt_str, intval);
968 static const struct drawtext_function {
970 unsigned argc_min, argc_max;
971 int tag; /**< opaque argument to func */
972 int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
974 { "expr", 1, 1, 0, func_eval_expr },
975 { "e", 1, 1, 0, func_eval_expr },
976 { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
977 { "eif", 2, 3, 0, func_eval_expr_int_format },
978 { "pict_type", 0, 0, 0, func_pict_type },
979 { "pts", 0, 3, 0, func_pts },
980 { "gmtime", 0, 1, 'G', func_strftime },
981 { "localtime", 0, 1, 'L', func_strftime },
982 { "frame_num", 0, 0, 0, func_frame_num },
983 { "n", 0, 0, 0, func_frame_num },
984 { "metadata", 1, 2, 0, func_metadata },
987 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
988 unsigned argc, char **argv)
992 for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
993 if (strcmp(fct, functions[i].name))
995 if (argc < functions[i].argc_min) {
996 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
997 fct, functions[i].argc_min);
998 return AVERROR(EINVAL);
1000 if (argc > functions[i].argc_max) {
1001 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
1002 fct, functions[i].argc_max);
1003 return AVERROR(EINVAL);
1007 if (i >= FF_ARRAY_ELEMS(functions)) {
1008 av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
1009 return AVERROR(EINVAL);
1011 return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
1014 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
1016 const char *text = *rtext;
1017 char *argv[16] = { NULL };
1018 unsigned argc = 0, i;
1022 av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
1023 return AVERROR(EINVAL);
1027 if (!(argv[argc++] = av_get_token(&text, ":}"))) {
1028 ret = AVERROR(ENOMEM);
1032 av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
1033 ret = AVERROR(EINVAL);
1036 if (argc == FF_ARRAY_ELEMS(argv))
1037 av_freep(&argv[--argc]); /* error will be caught later */
1043 if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
1046 *rtext = (char *)text + 1;
1049 for (i = 0; i < argc; i++)
1054 static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
1058 av_bprint_clear(bp);
1060 if (*text == '\\' && text[1]) {
1061 av_bprint_chars(bp, text[1], 1);
1063 } else if (*text == '%') {
1065 if ((ret = expand_function(ctx, bp, &text)) < 0)
1068 av_bprint_chars(bp, *text, 1);
1072 if (!av_bprint_is_complete(bp))
1073 return AVERROR(ENOMEM);
1077 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
1078 int width, int height,
1080 int x, int y, int borderw)
1082 char *text = s->expanded_text.str;
1086 Glyph *glyph = NULL;
1088 for (i = 0, p = text; *p; i++) {
1090 Glyph dummy = { 0 };
1091 GET_UTF8(code, *p++, continue;);
1093 /* skip new line chars, just go to new line */
1094 if (code == '\n' || code == '\r' || code == '\t')
1098 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1100 bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
1102 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
1103 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
1104 return AVERROR(EINVAL);
1106 x1 = s->positions[i].x+s->x+x - borderw;
1107 y1 = s->positions[i].y+s->y+y - borderw;
1109 ff_blend_mask(&s->dc, color,
1110 frame->data, frame->linesize, width, height,
1111 bitmap.buffer, bitmap.pitch,
1112 bitmap.width, bitmap.rows,
1113 bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
1121 static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)
1124 color->rgba[3] = (color->rgba[3] * s->alpha) / 255;
1125 ff_draw_color(&s->dc, color, color->rgba);
1128 static void update_alpha(DrawTextContext *s)
1130 double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);
1137 else if (alpha <= 0)
1140 s->alpha = 256 * alpha;
1143 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
1144 int width, int height)
1146 DrawTextContext *s = ctx->priv;
1147 AVFilterLink *inlink = ctx->inputs[0];
1149 uint32_t code = 0, prev_code = 0;
1150 int x = 0, y = 0, i = 0, ret;
1151 int max_text_line_w = 0, len;
1155 int y_min = 32000, y_max = -32000;
1156 int x_min = 32000, x_max = -32000;
1158 Glyph *glyph = NULL, *prev_glyph = NULL;
1159 Glyph dummy = { 0 };
1161 time_t now = time(0);
1163 AVBPrint *bp = &s->expanded_text;
1165 FFDrawColor fontcolor;
1166 FFDrawColor shadowcolor;
1167 FFDrawColor bordercolor;
1168 FFDrawColor boxcolor;
1170 av_bprint_clear(bp);
1172 if(s->basetime != AV_NOPTS_VALUE)
1173 now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
1175 switch (s->exp_mode) {
1177 av_bprintf(bp, "%s", s->text);
1180 if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
1184 localtime_r(&now, <ime);
1185 av_bprint_strftime(bp, s->text, <ime);
1189 if (s->tc_opt_string) {
1190 char tcbuf[AV_TIMECODE_STR_SIZE];
1191 av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);
1192 av_bprint_clear(bp);
1193 av_bprintf(bp, "%s%s", s->text, tcbuf);
1196 if (!av_bprint_is_complete(bp))
1197 return AVERROR(ENOMEM);
1198 text = s->expanded_text.str;
1199 if ((len = s->expanded_text.len) > s->nb_positions) {
1200 if (!(s->positions =
1201 av_realloc(s->positions, len*sizeof(*s->positions))))
1202 return AVERROR(ENOMEM);
1203 s->nb_positions = len;
1206 if (s->fontcolor_expr[0]) {
1207 /* If expression is set, evaluate and replace the static value */
1208 av_bprint_clear(&s->expanded_fontcolor);
1209 if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
1211 if (!av_bprint_is_complete(&s->expanded_fontcolor))
1212 return AVERROR(ENOMEM);
1213 av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);
1214 ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);
1217 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
1223 /* load and cache glyphs */
1224 for (i = 0, p = text; *p; i++) {
1225 GET_UTF8(code, *p++, continue;);
1229 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1231 ret = load_glyph(ctx, &glyph, code);
1236 y_min = FFMIN(glyph->bbox.yMin, y_min);
1237 y_max = FFMAX(glyph->bbox.yMax, y_max);
1238 x_min = FFMIN(glyph->bbox.xMin, x_min);
1239 x_max = FFMAX(glyph->bbox.xMax, x_max);
1241 s->max_glyph_h = y_max - y_min;
1242 s->max_glyph_w = x_max - x_min;
1244 /* compute and save position for each glyph */
1246 for (i = 0, p = text; *p; i++) {
1247 GET_UTF8(code, *p++, continue;);
1249 /* skip the \n in the sequence \r\n */
1250 if (prev_code == '\r' && code == '\n')
1254 if (is_newline(code)) {
1256 max_text_line_w = FFMAX(max_text_line_w, x);
1257 y += s->max_glyph_h + s->line_spacing;
1265 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1268 if (s->use_kerning && prev_glyph && glyph->code) {
1269 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1270 ft_kerning_default, &delta);
1275 s->positions[i].x = x + glyph->bitmap_left;
1276 s->positions[i].y = y - glyph->bitmap_top + y_max;
1277 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1278 else x += glyph->advance;
1281 max_text_line_w = FFMAX(x, max_text_line_w);
1283 s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1284 s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1286 s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1287 s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1288 s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1289 s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1291 s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1293 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1294 s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1295 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1298 update_color_with_alpha(s, &fontcolor , s->fontcolor );
1299 update_color_with_alpha(s, &shadowcolor, s->shadowcolor);
1300 update_color_with_alpha(s, &bordercolor, s->bordercolor);
1301 update_color_with_alpha(s, &boxcolor , s->boxcolor );
1303 box_w = FFMIN(width - 1 , max_text_line_w);
1304 box_h = FFMIN(height - 1, y + s->max_glyph_h);
1308 ff_blend_rectangle(&s->dc, &boxcolor,
1309 frame->data, frame->linesize, width, height,
1310 s->x - s->boxborderw, s->y - s->boxborderw,
1311 box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);
1313 if (s->shadowx || s->shadowy) {
1314 if ((ret = draw_glyphs(s, frame, width, height,
1315 &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1320 if ((ret = draw_glyphs(s, frame, width, height,
1321 &bordercolor, 0, 0, s->borderw)) < 0)
1324 if ((ret = draw_glyphs(s, frame, width, height,
1325 &fontcolor, 0, 0, 0)) < 0)
1331 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
1333 AVFilterContext *ctx = inlink->dst;
1334 AVFilterLink *outlink = ctx->outputs[0];
1335 DrawTextContext *s = ctx->priv;
1339 if ((ret = load_textfile(ctx)) < 0) {
1340 av_frame_free(&frame);
1343 #if CONFIG_LIBFRIBIDI
1344 if (s->text_shaping)
1345 if ((ret = shape_text(ctx)) < 0) {
1346 av_frame_free(&frame);
1352 s->var_values[VAR_N] = inlink->frame_count_out + s->start_number;
1353 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1354 NAN : frame->pts * av_q2d(inlink->time_base);
1356 s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1357 s->metadata = av_frame_get_metadata(frame);
1359 draw_text(ctx, frame, frame->width, frame->height);
1361 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1362 (int)s->var_values[VAR_N], s->var_values[VAR_T],
1363 (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1366 return ff_filter_frame(outlink, frame);
1369 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1372 .type = AVMEDIA_TYPE_VIDEO,
1373 .filter_frame = filter_frame,
1374 .config_props = config_input,
1375 .needs_writable = 1,
1380 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1383 .type = AVMEDIA_TYPE_VIDEO,
1388 AVFilter ff_vf_drawtext = {
1390 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1391 .priv_size = sizeof(DrawTextContext),
1392 .priv_class = &drawtext_class,
1395 .query_formats = query_formats,
1396 .inputs = avfilter_vf_drawtext_inputs,
1397 .outputs = avfilter_vf_drawtext_outputs,
1398 .process_command = command,
1399 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,