FFmpeg  4.4
vf_drawtext.c
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1 /*
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>
5  *
6  * This file is part of FFmpeg.
7  *
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.
12  *
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.
17  *
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
21  */
22 
23 /**
24  * @file
25  * drawtext filter, based on the original vhook/drawtext.c
26  * filter by Gustavo Sverzut Barbieri
27  */
28 
29 #include "config.h"
30 
31 #if HAVE_SYS_TIME_H
32 #include <sys/time.h>
33 #endif
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <time.h>
37 #if HAVE_UNISTD_H
38 #include <unistd.h>
39 #endif
40 #include <fenv.h>
41 
42 #if CONFIG_LIBFONTCONFIG
43 #include <fontconfig/fontconfig.h>
44 #endif
45 
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"
56 #include "libavutil/tree.h"
57 #include "libavutil/lfg.h"
58 #include "avfilter.h"
59 #include "drawutils.h"
60 #include "formats.h"
61 #include "internal.h"
62 #include "video.h"
63 
64 #if CONFIG_LIBFRIBIDI
65 #include <fribidi.h>
66 #endif
67 
68 #include <ft2build.h>
69 #include FT_FREETYPE_H
70 #include FT_GLYPH_H
71 #include FT_STROKER_H
72 
73 static const char *const var_names[] = {
74  "dar",
75  "hsub", "vsub",
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
84  "sar",
85  "t", ///< timestamp expressed in seconds
86  "text_h", "th", ///< height of the rendered text
87  "text_w", "tw", ///< width of the rendered text
88  "x",
89  "y",
90  "pict_type",
91  "pkt_pos",
92  "pkt_duration",
93  "pkt_size",
94  NULL
95 };
96 
97 static const char *const fun2_names[] = {
98  "rand"
99 };
100 
101 static double drand(void *opaque, double min, double max)
102 {
103  return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
104 }
105 
106 typedef double (*eval_func2)(void *, double a, double b);
107 
108 static const eval_func2 fun2[] = {
109  drand,
110  NULL
111 };
112 
113 enum var_name {
135 };
136 
141 };
142 
143 typedef struct DrawTextContext {
144  const AVClass *class;
145  int exp_mode; ///< expansion mode to use for the text
146  int reinit; ///< tells if the filter is being reinited
147 #if CONFIG_LIBFONTCONFIG
148  uint8_t *font; ///< font to be used
149 #endif
150  uint8_t *fontfile; ///< font to be used
151  uint8_t *text; ///< text to be drawn
152  AVBPrint expanded_text; ///< used to contain the expanded text
153  uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate
154  AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec
155  int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
156  FT_Vector *positions; ///< positions for each element in the text
157  size_t nb_positions; ///< number of elements of positions array
158  char *textfile; ///< file with text to be drawn
159  int x; ///< x position to start drawing text
160  int y; ///< y position to start drawing text
161  int max_glyph_w; ///< max glyph width
162  int max_glyph_h; ///< max glyph height
164  int borderw; ///< border width
165  char *fontsize_expr; ///< expression for fontsize
166  AVExpr *fontsize_pexpr; ///< parsed expressions for fontsize
167  unsigned int fontsize; ///< font size to use
168  unsigned int default_fontsize; ///< default font size to use
169 
170  int line_spacing; ///< lines spacing in pixels
171  short int draw_box; ///< draw box around text - true or false
172  int boxborderw; ///< box border width
173  int use_kerning; ///< font kerning is used - true/false
174  int tabsize; ///< tab size
175  int fix_bounds; ///< do we let it go out of frame bounds - t/f
176 
178  FFDrawColor fontcolor; ///< foreground color
179  FFDrawColor shadowcolor; ///< shadow color
180  FFDrawColor bordercolor; ///< border color
181  FFDrawColor boxcolor; ///< background color
182 
183  FT_Library library; ///< freetype font library handle
184  FT_Face face; ///< freetype font face handle
185  FT_Stroker stroker; ///< freetype stroker handle
186  struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
187  char *x_expr; ///< expression for x position
188  char *y_expr; ///< expression for y position
189  AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
190  int64_t basetime; ///< base pts time in the real world for display
192  char *a_expr;
194  int alpha;
195  AVLFG prng; ///< random
196  char *tc_opt_string; ///< specified timecode option string
197  AVRational tc_rate; ///< frame rate for timecode
198  AVTimecode tc; ///< timecode context
199  int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
200  int reload; ///< reload text file for each frame
201  int start_number; ///< starting frame number for n/frame_num var
202 #if CONFIG_LIBFRIBIDI
203  int text_shaping; ///< 1 to shape the text before drawing it
204 #endif
207 
208 #define OFFSET(x) offsetof(DrawTextContext, x)
209 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
210 
211 static const AVOption drawtext_options[]= {
212  {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
213  {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
214  {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
215  {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS},
216  {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, 0, 0, FLAGS},
217  {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, 0, 0, FLAGS},
218  {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS},
219  {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS},
220  {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 , FLAGS},
221  {"boxborderw", "set box border width", OFFSET(boxborderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
222  {"line_spacing", "set line spacing in pixels", OFFSET(line_spacing), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX,FLAGS},
223  {"fontsize", "set font size", OFFSET(fontsize_expr), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0 , FLAGS},
224  {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS},
225  {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS},
226  {"shadowx", "set shadow x offset", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
227  {"shadowy", "set shadow y offset", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
228  {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
229  {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
230  {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
231 #if CONFIG_LIBFONTCONFIG
232  { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
233 #endif
234 
235  {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
236  {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
237  {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
238  {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
239 
240  {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
241  {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
242  {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
243  {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
244  {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
245  {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
246  { "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
247  {"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
248  {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
249 
250 #if CONFIG_LIBFRIBIDI
251  {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
252 #endif
253 
254  /* FT_LOAD_* flags */
255  { "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" },
256  { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
257  { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
258  { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
259  { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
260  { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
261  { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
262  { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
263  { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
264  { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
265  { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
266  { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
267  { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
268  { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
269  { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
270  { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
271  { NULL }
272 };
273 
275 
276 #undef __FTERRORS_H__
277 #define FT_ERROR_START_LIST {
278 #define FT_ERRORDEF(e, v, s) { (e), (s) },
279 #define FT_ERROR_END_LIST { 0, NULL } };
280 
281 static const struct ft_error {
282  int err;
283  const char *err_msg;
284 } ft_errors[] =
285 #include FT_ERRORS_H
286 
287 #define FT_ERRMSG(e) ft_errors[e].err_msg
288 
289 typedef struct Glyph {
290  FT_Glyph glyph;
291  FT_Glyph border_glyph;
292  uint32_t code;
293  unsigned int fontsize;
294  FT_Bitmap bitmap; ///< array holding bitmaps of font
295  FT_Bitmap border_bitmap; ///< array holding bitmaps of font border
296  FT_BBox bbox;
297  int advance;
298  int bitmap_left;
299  int bitmap_top;
300 } Glyph;
301 
302 static int glyph_cmp(const void *key, const void *b)
303 {
304  const Glyph *a = key, *bb = b;
305  int64_t diff = (int64_t)a->code - (int64_t)bb->code;
306 
307  if (diff != 0)
308  return diff > 0 ? 1 : -1;
309  else
310  return FFDIFFSIGN((int64_t)a->fontsize, (int64_t)bb->fontsize);
311 }
312 
313 /**
314  * Load glyphs corresponding to the UTF-32 codepoint code.
315  */
316 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
317 {
318  DrawTextContext *s = ctx->priv;
319  FT_BitmapGlyph bitmapglyph;
320  Glyph *glyph;
321  struct AVTreeNode *node = NULL;
322  int ret;
323 
324  /* load glyph into s->face->glyph */
325  if (FT_Load_Char(s->face, code, s->ft_load_flags))
326  return AVERROR(EINVAL);
327 
328  glyph = av_mallocz(sizeof(*glyph));
329  if (!glyph) {
330  ret = AVERROR(ENOMEM);
331  goto error;
332  }
333  glyph->code = code;
334  glyph->fontsize = s->fontsize;
335 
336  if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {
337  ret = AVERROR(EINVAL);
338  goto error;
339  }
340  if (s->borderw) {
341  glyph->border_glyph = glyph->glyph;
342  if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||
343  FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
344  ret = AVERROR_EXTERNAL;
345  goto error;
346  }
347  bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;
348  glyph->border_bitmap = bitmapglyph->bitmap;
349  }
350  if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
351  ret = AVERROR_EXTERNAL;
352  goto error;
353  }
354  bitmapglyph = (FT_BitmapGlyph) glyph->glyph;
355 
356  glyph->bitmap = bitmapglyph->bitmap;
357  glyph->bitmap_left = bitmapglyph->left;
358  glyph->bitmap_top = bitmapglyph->top;
359  glyph->advance = s->face->glyph->advance.x >> 6;
360 
361  /* measure text height to calculate text_height (or the maximum text height) */
362  FT_Glyph_Get_CBox(glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
363 
364  /* cache the newly created glyph */
365  if (!(node = av_tree_node_alloc())) {
366  ret = AVERROR(ENOMEM);
367  goto error;
368  }
369  av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
370 
371  if (glyph_ptr)
372  *glyph_ptr = glyph;
373  return 0;
374 
375 error:
376  if (glyph)
377  av_freep(&glyph->glyph);
378 
379  av_freep(&glyph);
380  av_freep(&node);
381  return ret;
382 }
383 
384 static av_cold int set_fontsize(AVFilterContext *ctx, unsigned int fontsize)
385 {
386  int err;
387  DrawTextContext *s = ctx->priv;
388 
389  if ((err = FT_Set_Pixel_Sizes(s->face, 0, fontsize))) {
390  av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
391  fontsize, FT_ERRMSG(err));
392  return AVERROR(EINVAL);
393  }
394 
395  s->fontsize = fontsize;
396 
397  return 0;
398 }
399 
401 {
402  DrawTextContext *s = ctx->priv;
403  int err;
404 
405  if (s->fontsize_pexpr)
406  return 0;
407 
408  if (s->fontsize_expr == NULL)
409  return AVERROR(EINVAL);
410 
411  if ((err = av_expr_parse(&s->fontsize_pexpr, s->fontsize_expr, var_names,
412  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
413  return err;
414 
415  return 0;
416 }
417 
419 {
420  DrawTextContext *s = ctx->priv;
421  unsigned int fontsize = s->default_fontsize;
422  int err;
423  double size, roundedsize;
424 
425  // if no fontsize specified use the default
426  if (s->fontsize_expr != NULL) {
427  if ((err = parse_fontsize(ctx)) < 0)
428  return err;
429 
430  size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng);
431 
432  if (!isnan(size)) {
433  roundedsize = round(size);
434  // test for overflow before cast
435  if (!(roundedsize > INT_MIN && roundedsize < INT_MAX)) {
436  av_log(ctx, AV_LOG_ERROR, "fontsize overflow\n");
437  return AVERROR(EINVAL);
438  }
439 
440  fontsize = roundedsize;
441  }
442  }
443 
444  if (fontsize == 0)
445  fontsize = 1;
446 
447  // no change
448  if (fontsize == s->fontsize)
449  return 0;
450 
451  return set_fontsize(ctx, fontsize);
452 }
453 
454 static int load_font_file(AVFilterContext *ctx, const char *path, int index)
455 {
456  DrawTextContext *s = ctx->priv;
457  int err;
458 
459  err = FT_New_Face(s->library, path, index, &s->face);
460  if (err) {
461 #if !CONFIG_LIBFONTCONFIG
462  av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
463  s->fontfile, FT_ERRMSG(err));
464 #endif
465  return AVERROR(EINVAL);
466  }
467  return 0;
468 }
469 
470 #if CONFIG_LIBFONTCONFIG
471 static int load_font_fontconfig(AVFilterContext *ctx)
472 {
473  DrawTextContext *s = ctx->priv;
474  FcConfig *fontconfig;
475  FcPattern *pat, *best;
476  FcResult result = FcResultMatch;
477  FcChar8 *filename;
478  int index;
479  double size;
480  int err = AVERROR(ENOENT);
481  int parse_err;
482 
483  fontconfig = FcInitLoadConfigAndFonts();
484  if (!fontconfig) {
485  av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
486  return AVERROR_UNKNOWN;
487  }
488  pat = FcNameParse(s->fontfile ? s->fontfile :
489  (uint8_t *)(intptr_t)"default");
490  if (!pat) {
491  av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
492  return AVERROR(EINVAL);
493  }
494 
495  FcPatternAddString(pat, FC_FAMILY, s->font);
496 
497  parse_err = parse_fontsize(ctx);
498  if (!parse_err) {
499  double size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng);
500 
501  if (isnan(size)) {
502  av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
503  return AVERROR(EINVAL);
504  }
505 
506  FcPatternAddDouble(pat, FC_SIZE, size);
507  }
508 
509  FcDefaultSubstitute(pat);
510 
511  if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
512  av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
513  FcPatternDestroy(pat);
514  return AVERROR(ENOMEM);
515  }
516 
517  best = FcFontMatch(fontconfig, pat, &result);
518  FcPatternDestroy(pat);
519 
520  if (!best || result != FcResultMatch) {
522  "Cannot find a valid font for the family %s\n",
523  s->font);
524  goto fail;
525  }
526 
527  if (
528  FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
529  FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
530  av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
531  return AVERROR(EINVAL);
532  }
533 
534  if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
535  av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
536  s->font);
537  goto fail;
538  }
539 
540  av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
541  if (parse_err)
542  s->default_fontsize = size + 0.5;
543 
544  err = load_font_file(ctx, filename, index);
545  if (err)
546  return err;
547  FcConfigDestroy(fontconfig);
548 fail:
549  FcPatternDestroy(best);
550  return err;
551 }
552 #endif
553 
555 {
556  DrawTextContext *s = ctx->priv;
557  int err;
558 
559  /* load the face, and set up the encoding, which is by default UTF-8 */
560  err = load_font_file(ctx, s->fontfile, 0);
561  if (!err)
562  return 0;
563 #if CONFIG_LIBFONTCONFIG
564  err = load_font_fontconfig(ctx);
565  if (!err)
566  return 0;
567 #endif
568  return err;
569 }
570 
571 static inline int is_newline(uint32_t c)
572 {
573  return c == '\n' || c == '\r' || c == '\f' || c == '\v';
574 }
575 
577 {
578  DrawTextContext *s = ctx->priv;
579  int err;
580  uint8_t *textbuf;
581  uint8_t *tmp;
582  size_t textbuf_size;
583 
584  if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
586  "The text file '%s' could not be read or is empty\n",
587  s->textfile);
588  return err;
589  }
590 
591  if (textbuf_size > 0 && is_newline(textbuf[textbuf_size - 1]))
592  textbuf_size--;
593  if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) {
594  av_file_unmap(textbuf, textbuf_size);
595  return AVERROR(ENOMEM);
596  }
597  s->text = tmp;
598  memcpy(s->text, textbuf, textbuf_size);
599  s->text[textbuf_size] = 0;
600  av_file_unmap(textbuf, textbuf_size);
601 
602  return 0;
603 }
604 
605 #if CONFIG_LIBFRIBIDI
606 static int shape_text(AVFilterContext *ctx)
607 {
608  DrawTextContext *s = ctx->priv;
609  uint8_t *tmp;
610  int ret = AVERROR(ENOMEM);
611  static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |
612  FRIBIDI_FLAGS_ARABIC;
613  FriBidiChar *unicodestr = NULL;
614  FriBidiStrIndex len;
615  FriBidiParType direction = FRIBIDI_PAR_LTR;
616  FriBidiStrIndex line_start = 0;
617  FriBidiStrIndex line_end = 0;
618  FriBidiLevel *embedding_levels = NULL;
619  FriBidiArabicProp *ar_props = NULL;
620  FriBidiCharType *bidi_types = NULL;
621  FriBidiStrIndex i,j;
622 
623  len = strlen(s->text);
624  if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) {
625  goto out;
626  }
627  len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,
628  s->text, len, unicodestr);
629 
630  bidi_types = av_malloc_array(len, sizeof(*bidi_types));
631  if (!bidi_types) {
632  goto out;
633  }
634 
635  fribidi_get_bidi_types(unicodestr, len, bidi_types);
636 
637  embedding_levels = av_malloc_array(len, sizeof(*embedding_levels));
638  if (!embedding_levels) {
639  goto out;
640  }
641 
642  if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction,
643  embedding_levels)) {
644  goto out;
645  }
646 
647  ar_props = av_malloc_array(len, sizeof(*ar_props));
648  if (!ar_props) {
649  goto out;
650  }
651 
652  fribidi_get_joining_types(unicodestr, len, ar_props);
653  fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props);
654  fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr);
655 
656  for (line_end = 0, line_start = 0; line_end < len; line_end++) {
657  if (is_newline(unicodestr[line_end]) || line_end == len - 1) {
658  if (!fribidi_reorder_line(flags, bidi_types,
659  line_end - line_start + 1, line_start,
660  direction, embedding_levels, unicodestr,
661  NULL)) {
662  goto out;
663  }
664  line_start = line_end + 1;
665  }
666  }
667 
668  /* Remove zero-width fill chars put in by libfribidi */
669  for (i = 0, j = 0; i < len; i++)
670  if (unicodestr[i] != FRIBIDI_CHAR_FILL)
671  unicodestr[j++] = unicodestr[i];
672  len = j;
673 
674  if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) {
675  /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */
676  goto out;
677  }
678 
679  s->text = tmp;
680  len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,
681  unicodestr, len, s->text);
682  ret = 0;
683 
684 out:
685  av_free(unicodestr);
686  av_free(embedding_levels);
687  av_free(ar_props);
688  av_free(bidi_types);
689  return ret;
690 }
691 #endif
692 
694 {
695  int err;
696  DrawTextContext *s = ctx->priv;
697  Glyph *glyph;
698 
699  av_expr_free(s->fontsize_pexpr);
700  s->fontsize_pexpr = NULL;
701 
702  s->fontsize = 0;
703  s->default_fontsize = 16;
704 
705  if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
706  av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
707  return AVERROR(EINVAL);
708  }
709 
710  if (s->textfile) {
711  if (s->text) {
713  "Both text and text file provided. Please provide only one\n");
714  return AVERROR(EINVAL);
715  }
716  if ((err = load_textfile(ctx)) < 0)
717  return err;
718  }
719 
720  if (s->reload && !s->textfile)
721  av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
722 
723  if (s->tc_opt_string) {
724  int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
725  s->tc_opt_string, ctx);
726  if (ret < 0)
727  return ret;
728  if (s->tc24hmax)
729  s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
730  if (!s->text)
731  s->text = av_strdup("");
732  }
733 
734  if (!s->text) {
736  "Either text, a valid file or a timecode must be provided\n");
737  return AVERROR(EINVAL);
738  }
739 
740 #if CONFIG_LIBFRIBIDI
741  if (s->text_shaping)
742  if ((err = shape_text(ctx)) < 0)
743  return err;
744 #endif
745 
746  if ((err = FT_Init_FreeType(&(s->library)))) {
748  "Could not load FreeType: %s\n", FT_ERRMSG(err));
749  return AVERROR(EINVAL);
750  }
751 
752  if ((err = load_font(ctx)) < 0)
753  return err;
754 
755  if ((err = update_fontsize(ctx)) < 0)
756  return err;
757 
758  if (s->borderw) {
759  if (FT_Stroker_New(s->library, &s->stroker)) {
760  av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");
761  return AVERROR_EXTERNAL;
762  }
763  FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
764  FT_STROKER_LINEJOIN_ROUND, 0);
765  }
766 
767  s->use_kerning = FT_HAS_KERNING(s->face);
768 
769  /* load the fallback glyph with code 0 */
770  load_glyph(ctx, NULL, 0);
771 
772  /* set the tabsize in pixels */
773  if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
774  av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
775  return err;
776  }
777  s->tabsize *= glyph->advance;
778 
779  if (s->exp_mode == EXP_STRFTIME &&
780  (strchr(s->text, '%') || strchr(s->text, '\\')))
781  av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
782 
783  av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
784  av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED);
785 
786  return 0;
787 }
788 
790 {
792 }
793 
794 static int glyph_enu_free(void *opaque, void *elem)
795 {
796  Glyph *glyph = elem;
797 
798  FT_Done_Glyph(glyph->glyph);
799  FT_Done_Glyph(glyph->border_glyph);
800  av_free(elem);
801  return 0;
802 }
803 
805 {
806  DrawTextContext *s = ctx->priv;
807 
808  av_expr_free(s->x_pexpr);
809  av_expr_free(s->y_pexpr);
810  av_expr_free(s->a_pexpr);
811  av_expr_free(s->fontsize_pexpr);
812 
813  s->x_pexpr = s->y_pexpr = s->a_pexpr = s->fontsize_pexpr = NULL;
814 
815  av_freep(&s->positions);
816  s->nb_positions = 0;
817 
819  av_tree_destroy(s->glyphs);
820  s->glyphs = NULL;
821 
822  FT_Done_Face(s->face);
823  FT_Stroker_Done(s->stroker);
824  FT_Done_FreeType(s->library);
825 
826  av_bprint_finalize(&s->expanded_text, NULL);
827  av_bprint_finalize(&s->expanded_fontcolor, NULL);
828 }
829 
830 static int config_input(AVFilterLink *inlink)
831 {
832  AVFilterContext *ctx = inlink->dst;
833  DrawTextContext *s = ctx->priv;
834  char *expr;
835  int ret;
836 
837  ff_draw_init(&s->dc, inlink->format, FF_DRAW_PROCESS_ALPHA);
838  ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
839  ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
840  ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
841  ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
842 
843  s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
844  s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
845  s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
846  s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
847  s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
848  s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
849  s->var_values[VAR_X] = NAN;
850  s->var_values[VAR_Y] = NAN;
851  s->var_values[VAR_T] = NAN;
852 
853  av_lfg_init(&s->prng, av_get_random_seed());
854 
855  av_expr_free(s->x_pexpr);
856  av_expr_free(s->y_pexpr);
857  av_expr_free(s->a_pexpr);
858  s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;
859 
860  if ((ret = av_expr_parse(&s->x_pexpr, expr = s->x_expr, var_names,
861  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
862  (ret = av_expr_parse(&s->y_pexpr, expr = s->y_expr, var_names,
863  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
864  (ret = av_expr_parse(&s->a_pexpr, expr = s->a_expr, var_names,
865  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) {
866  av_log(ctx, AV_LOG_ERROR, "Failed to parse expression: %s \n", expr);
867  return AVERROR(EINVAL);
868  }
869 
870  return 0;
871 }
872 
873 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
874 {
875  DrawTextContext *old = ctx->priv;
876  DrawTextContext *new = NULL;
877  int ret;
878 
879  if (!strcmp(cmd, "reinit")) {
880  new = av_mallocz(sizeof(DrawTextContext));
881  if (!new)
882  return AVERROR(ENOMEM);
883 
884  new->class = &drawtext_class;
885  ret = av_opt_copy(new, old);
886  if (ret < 0)
887  goto fail;
888 
889  ctx->priv = new;
890  ret = av_set_options_string(ctx, arg, "=", ":");
891  if (ret < 0) {
892  ctx->priv = old;
893  goto fail;
894  }
895 
896  ret = init(ctx);
897  if (ret < 0) {
898  uninit(ctx);
899  ctx->priv = old;
900  goto fail;
901  }
902 
903  new->reinit = 1;
904 
905  ctx->priv = old;
906  uninit(ctx);
907  av_freep(&old);
908 
909  ctx->priv = new;
910  return config_input(ctx->inputs[0]);
911  } else
912  return AVERROR(ENOSYS);
913 
914 fail:
915  av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n");
916  av_freep(&new);
917  return ret;
918 }
919 
920 static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
921  char *fct, unsigned argc, char **argv, int tag)
922 {
923  DrawTextContext *s = ctx->priv;
924 
925  av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
926  return 0;
927 }
928 
929 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
930  char *fct, unsigned argc, char **argv, int tag)
931 {
932  DrawTextContext *s = ctx->priv;
933  const char *fmt;
934  double pts = s->var_values[VAR_T];
935  int ret;
936 
937  fmt = argc >= 1 ? argv[0] : "flt";
938  if (argc >= 2) {
939  int64_t delta;
940  if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
941  av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
942  return ret;
943  }
944  pts += (double)delta / AV_TIME_BASE;
945  }
946  if (!strcmp(fmt, "flt")) {
947  av_bprintf(bp, "%.6f", pts);
948  } else if (!strcmp(fmt, "hms")) {
949  if (isnan(pts)) {
950  av_bprintf(bp, " ??:??:??.???");
951  } else {
952  int64_t ms = llrint(pts * 1000);
953  char sign = ' ';
954  if (ms < 0) {
955  sign = '-';
956  ms = -ms;
957  }
958  if (argc >= 3) {
959  if (!strcmp(argv[2], "24HH")) {
960  ms %= 24 * 60 * 60 * 1000;
961  } else {
962  av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", argv[2]);
963  return AVERROR(EINVAL);
964  }
965  }
966  av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
967  (int)(ms / (60 * 60 * 1000)),
968  (int)(ms / (60 * 1000)) % 60,
969  (int)(ms / 1000) % 60,
970  (int)(ms % 1000));
971  }
972  } else if (!strcmp(fmt, "localtime") ||
973  !strcmp(fmt, "gmtime")) {
974  struct tm tm;
975  time_t ms = (time_t)pts;
976  const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S";
977  if (!strcmp(fmt, "localtime"))
978  localtime_r(&ms, &tm);
979  else
980  gmtime_r(&ms, &tm);
981  av_bprint_strftime(bp, timefmt, &tm);
982  } else {
983  av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
984  return AVERROR(EINVAL);
985  }
986  return 0;
987 }
988 
989 static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
990  char *fct, unsigned argc, char **argv, int tag)
991 {
992  DrawTextContext *s = ctx->priv;
993 
994  av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
995  return 0;
996 }
997 
998 static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
999  char *fct, unsigned argc, char **argv, int tag)
1000 {
1001  DrawTextContext *s = ctx->priv;
1002  AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
1003 
1004  if (e && e->value)
1005  av_bprintf(bp, "%s", e->value);
1006  else if (argc >= 2)
1007  av_bprintf(bp, "%s", argv[1]);
1008  return 0;
1009 }
1010 
1011 static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
1012  char *fct, unsigned argc, char **argv, int tag)
1013 {
1014  const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
1015  time_t now;
1016  struct tm tm;
1017 
1018  time(&now);
1019  if (tag == 'L')
1020  localtime_r(&now, &tm);
1021  else
1022  tm = *gmtime_r(&now, &tm);
1023  av_bprint_strftime(bp, fmt, &tm);
1024  return 0;
1025 }
1026 
1027 static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
1028  char *fct, unsigned argc, char **argv, int tag)
1029 {
1030  DrawTextContext *s = ctx->priv;
1031  double res;
1032  int ret;
1033 
1034  ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
1035  NULL, NULL, fun2_names, fun2,
1036  &s->prng, 0, ctx);
1037  if (ret < 0)
1039  "Expression '%s' for the expr text expansion function is not valid\n",
1040  argv[0]);
1041  else
1042  av_bprintf(bp, "%f", res);
1043 
1044  return ret;
1045 }
1046 
1048  char *fct, unsigned argc, char **argv, int tag)
1049 {
1050  DrawTextContext *s = ctx->priv;
1051  double res;
1052  int intval;
1053  int ret;
1054  unsigned int positions = 0;
1055  char fmt_str[30] = "%";
1056 
1057  /*
1058  * argv[0] expression to be converted to `int`
1059  * argv[1] format: 'x', 'X', 'd' or 'u'
1060  * argv[2] positions printed (optional)
1061  */
1062 
1063  ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
1064  NULL, NULL, fun2_names, fun2,
1065  &s->prng, 0, ctx);
1066  if (ret < 0) {
1068  "Expression '%s' for the expr text expansion function is not valid\n",
1069  argv[0]);
1070  return ret;
1071  }
1072 
1073  if (!strchr("xXdu", argv[1][0])) {
1074  av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
1075  " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
1076  return AVERROR(EINVAL);
1077  }
1078 
1079  if (argc == 3) {
1080  ret = sscanf(argv[2], "%u", &positions);
1081  if (ret != 1) {
1082  av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
1083  " to print: '%s'\n", argv[2]);
1084  return AVERROR(EINVAL);
1085  }
1086  }
1087 
1088  feclearexcept(FE_ALL_EXCEPT);
1089  intval = res;
1090 #if defined(FE_INVALID) && defined(FE_OVERFLOW) && defined(FE_UNDERFLOW)
1091  if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
1092  av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
1093  return AVERROR(EINVAL);
1094  }
1095 #endif
1096 
1097  if (argc == 3)
1098  av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
1099  av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
1100 
1101  av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
1102  res, argv[0], fmt_str);
1103 
1104  av_bprintf(bp, fmt_str, intval);
1105 
1106  return 0;
1107 }
1108 
1109 static const struct drawtext_function {
1110  const char *name;
1111  unsigned argc_min, argc_max;
1112  int tag; /**< opaque argument to func */
1113  int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
1114 } functions[] = {
1115  { "expr", 1, 1, 0, func_eval_expr },
1116  { "e", 1, 1, 0, func_eval_expr },
1117  { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
1118  { "eif", 2, 3, 0, func_eval_expr_int_format },
1119  { "pict_type", 0, 0, 0, func_pict_type },
1120  { "pts", 0, 3, 0, func_pts },
1121  { "gmtime", 0, 1, 'G', func_strftime },
1122  { "localtime", 0, 1, 'L', func_strftime },
1123  { "frame_num", 0, 0, 0, func_frame_num },
1124  { "n", 0, 0, 0, func_frame_num },
1125  { "metadata", 1, 2, 0, func_metadata },
1126 };
1127 
1128 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
1129  unsigned argc, char **argv)
1130 {
1131  unsigned i;
1132 
1133  for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
1134  if (strcmp(fct, functions[i].name))
1135  continue;
1136  if (argc < functions[i].argc_min) {
1137  av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
1138  fct, functions[i].argc_min);
1139  return AVERROR(EINVAL);
1140  }
1141  if (argc > functions[i].argc_max) {
1142  av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
1143  fct, functions[i].argc_max);
1144  return AVERROR(EINVAL);
1145  }
1146  break;
1147  }
1148  if (i >= FF_ARRAY_ELEMS(functions)) {
1149  av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
1150  return AVERROR(EINVAL);
1151  }
1152  return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
1153 }
1154 
1155 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
1156 {
1157  const char *text = *rtext;
1158  char *argv[16] = { NULL };
1159  unsigned argc = 0, i;
1160  int ret;
1161 
1162  if (*text != '{') {
1163  av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
1164  return AVERROR(EINVAL);
1165  }
1166  text++;
1167  while (1) {
1168  if (!(argv[argc++] = av_get_token(&text, ":}"))) {
1169  ret = AVERROR(ENOMEM);
1170  goto end;
1171  }
1172  if (!*text) {
1173  av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
1174  ret = AVERROR(EINVAL);
1175  goto end;
1176  }
1177  if (argc == FF_ARRAY_ELEMS(argv))
1178  av_freep(&argv[--argc]); /* error will be caught later */
1179  if (*text == '}')
1180  break;
1181  text++;
1182  }
1183 
1184  if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
1185  goto end;
1186  ret = 0;
1187  *rtext = (char *)text + 1;
1188 
1189 end:
1190  for (i = 0; i < argc; i++)
1191  av_freep(&argv[i]);
1192  return ret;
1193 }
1194 
1195 static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
1196 {
1197  int ret;
1198 
1199  av_bprint_clear(bp);
1200  while (*text) {
1201  if (*text == '\\' && text[1]) {
1202  av_bprint_chars(bp, text[1], 1);
1203  text += 2;
1204  } else if (*text == '%') {
1205  text++;
1206  if ((ret = expand_function(ctx, bp, &text)) < 0)
1207  return ret;
1208  } else {
1209  av_bprint_chars(bp, *text, 1);
1210  text++;
1211  }
1212  }
1213  if (!av_bprint_is_complete(bp))
1214  return AVERROR(ENOMEM);
1215  return 0;
1216 }
1217 
1219  int width, int height,
1220  FFDrawColor *color,
1221  int x, int y, int borderw)
1222 {
1223  char *text = s->expanded_text.str;
1224  uint32_t code = 0;
1225  int i, x1, y1;
1226  uint8_t *p;
1227  Glyph *glyph = NULL;
1228 
1229  for (i = 0, p = text; *p; i++) {
1230  FT_Bitmap bitmap;
1231  Glyph dummy = { 0 };
1232  GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid;);
1233 continue_on_invalid:
1234 
1235  /* skip new line chars, just go to new line */
1236  if (code == '\n' || code == '\r' || code == '\t')
1237  continue;
1238 
1239  dummy.code = code;
1240  dummy.fontsize = s->fontsize;
1241  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1242 
1243  bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
1244 
1245  if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
1246  glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
1247  return AVERROR(EINVAL);
1248 
1249  x1 = s->positions[i].x+s->x+x - borderw;
1250  y1 = s->positions[i].y+s->y+y - borderw;
1251 
1252  ff_blend_mask(&s->dc, color,
1254  bitmap.buffer, bitmap.pitch,
1255  bitmap.width, bitmap.rows,
1256  bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
1257  0, x1, y1);
1258  }
1259 
1260  return 0;
1261 }
1262 
1263 
1265 {
1266  *color = incolor;
1267  color->rgba[3] = (color->rgba[3] * s->alpha) / 255;
1268  ff_draw_color(&s->dc, color, color->rgba);
1269 }
1270 
1272 {
1273  double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);
1274 
1275  if (isnan(alpha))
1276  return;
1277 
1278  if (alpha >= 1.0)
1279  s->alpha = 255;
1280  else if (alpha <= 0)
1281  s->alpha = 0;
1282  else
1283  s->alpha = 256 * alpha;
1284 }
1285 
1287  int width, int height)
1288 {
1289  DrawTextContext *s = ctx->priv;
1290  AVFilterLink *inlink = ctx->inputs[0];
1291 
1292  uint32_t code = 0, prev_code = 0;
1293  int x = 0, y = 0, i = 0, ret;
1294  int max_text_line_w = 0, len;
1295  int box_w, box_h;
1296  char *text;
1297  uint8_t *p;
1298  int y_min = 32000, y_max = -32000;
1299  int x_min = 32000, x_max = -32000;
1300  FT_Vector delta;
1301  Glyph *glyph = NULL, *prev_glyph = NULL;
1302  Glyph dummy = { 0 };
1303 
1304  time_t now = time(0);
1305  struct tm ltime;
1306  AVBPrint *bp = &s->expanded_text;
1307 
1308  FFDrawColor fontcolor;
1309  FFDrawColor shadowcolor;
1310  FFDrawColor bordercolor;
1311  FFDrawColor boxcolor;
1312 
1313  av_bprint_clear(bp);
1314 
1315  if(s->basetime != AV_NOPTS_VALUE)
1316  now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
1317 
1318  switch (s->exp_mode) {
1319  case EXP_NONE:
1320  av_bprintf(bp, "%s", s->text);
1321  break;
1322  case EXP_NORMAL:
1323  if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
1324  return ret;
1325  break;
1326  case EXP_STRFTIME:
1327  localtime_r(&now, &ltime);
1328  av_bprint_strftime(bp, s->text, &ltime);
1329  break;
1330  }
1331 
1332  if (s->tc_opt_string) {
1333  char tcbuf[AV_TIMECODE_STR_SIZE];
1334  av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);
1335  av_bprint_clear(bp);
1336  av_bprintf(bp, "%s%s", s->text, tcbuf);
1337  }
1338 
1339  if (!av_bprint_is_complete(bp))
1340  return AVERROR(ENOMEM);
1341  text = s->expanded_text.str;
1342  if ((len = s->expanded_text.len) > s->nb_positions) {
1343  if (!(s->positions =
1344  av_realloc(s->positions, len*sizeof(*s->positions))))
1345  return AVERROR(ENOMEM);
1346  s->nb_positions = len;
1347  }
1348 
1349  if (s->fontcolor_expr[0]) {
1350  /* If expression is set, evaluate and replace the static value */
1351  av_bprint_clear(&s->expanded_fontcolor);
1352  if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
1353  return ret;
1354  if (!av_bprint_is_complete(&s->expanded_fontcolor))
1355  return AVERROR(ENOMEM);
1356  av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);
1357  ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);
1358  if (ret)
1359  return ret;
1360  ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
1361  }
1362 
1363  x = 0;
1364  y = 0;
1365 
1366  if ((ret = update_fontsize(ctx)) < 0)
1367  return ret;
1368 
1369  /* load and cache glyphs */
1370  for (i = 0, p = text; *p; i++) {
1371  GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid;);
1372 continue_on_invalid:
1373 
1374  /* get glyph */
1375  dummy.code = code;
1376  dummy.fontsize = s->fontsize;
1377  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1378  if (!glyph) {
1379  ret = load_glyph(ctx, &glyph, code);
1380  if (ret < 0)
1381  return ret;
1382  }
1383 
1384  y_min = FFMIN(glyph->bbox.yMin, y_min);
1385  y_max = FFMAX(glyph->bbox.yMax, y_max);
1386  x_min = FFMIN(glyph->bbox.xMin, x_min);
1387  x_max = FFMAX(glyph->bbox.xMax, x_max);
1388  }
1389  s->max_glyph_h = y_max - y_min;
1390  s->max_glyph_w = x_max - x_min;
1391 
1392  /* compute and save position for each glyph */
1393  glyph = NULL;
1394  for (i = 0, p = text; *p; i++) {
1395  GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid2;);
1396 continue_on_invalid2:
1397 
1398  /* skip the \n in the sequence \r\n */
1399  if (prev_code == '\r' && code == '\n')
1400  continue;
1401 
1402  prev_code = code;
1403  if (is_newline(code)) {
1404 
1405  max_text_line_w = FFMAX(max_text_line_w, x);
1406  y += s->max_glyph_h + s->line_spacing;
1407  x = 0;
1408  continue;
1409  }
1410 
1411  /* get glyph */
1412  prev_glyph = glyph;
1413  dummy.code = code;
1414  dummy.fontsize = s->fontsize;
1415  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1416 
1417  /* kerning */
1418  if (s->use_kerning && prev_glyph && glyph->code) {
1419  FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1420  ft_kerning_default, &delta);
1421  x += delta.x >> 6;
1422  }
1423 
1424  /* save position */
1425  s->positions[i].x = x + glyph->bitmap_left;
1426  s->positions[i].y = y - glyph->bitmap_top + y_max;
1427  if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1428  else x += glyph->advance;
1429  }
1430 
1431  max_text_line_w = FFMAX(x, max_text_line_w);
1432 
1433  s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1434  s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1435 
1436  s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1437  s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1438  s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1439  s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1440 
1441  s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1442 
1443  s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1444  s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1445  /* It is necessary if x is expressed from y */
1446  s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1447 
1448  update_alpha(s);
1449  update_color_with_alpha(s, &fontcolor , s->fontcolor );
1450  update_color_with_alpha(s, &shadowcolor, s->shadowcolor);
1451  update_color_with_alpha(s, &bordercolor, s->bordercolor);
1452  update_color_with_alpha(s, &boxcolor , s->boxcolor );
1453 
1454  box_w = max_text_line_w;
1455  box_h = y + s->max_glyph_h;
1456 
1457  if (s->fix_bounds) {
1458 
1459  /* calculate footprint of text effects */
1460  int boxoffset = s->draw_box ? FFMAX(s->boxborderw, 0) : 0;
1461  int borderoffset = s->borderw ? FFMAX(s->borderw, 0) : 0;
1462 
1463  int offsetleft = FFMAX3(boxoffset, borderoffset,
1464  (s->shadowx < 0 ? FFABS(s->shadowx) : 0));
1465  int offsettop = FFMAX3(boxoffset, borderoffset,
1466  (s->shadowy < 0 ? FFABS(s->shadowy) : 0));
1467 
1468  int offsetright = FFMAX3(boxoffset, borderoffset,
1469  (s->shadowx > 0 ? s->shadowx : 0));
1470  int offsetbottom = FFMAX3(boxoffset, borderoffset,
1471  (s->shadowy > 0 ? s->shadowy : 0));
1472 
1473 
1474  if (s->x - offsetleft < 0) s->x = offsetleft;
1475  if (s->y - offsettop < 0) s->y = offsettop;
1476 
1477  if (s->x + box_w + offsetright > width)
1478  s->x = FFMAX(width - box_w - offsetright, 0);
1479  if (s->y + box_h + offsetbottom > height)
1480  s->y = FFMAX(height - box_h - offsetbottom, 0);
1481  }
1482 
1483  /* draw box */
1484  if (s->draw_box)
1485  ff_blend_rectangle(&s->dc, &boxcolor,
1487  s->x - s->boxborderw, s->y - s->boxborderw,
1488  box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);
1489 
1490  if (s->shadowx || s->shadowy) {
1491  if ((ret = draw_glyphs(s, frame, width, height,
1492  &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1493  return ret;
1494  }
1495 
1496  if (s->borderw) {
1497  if ((ret = draw_glyphs(s, frame, width, height,
1498  &bordercolor, 0, 0, s->borderw)) < 0)
1499  return ret;
1500  }
1501  if ((ret = draw_glyphs(s, frame, width, height,
1502  &fontcolor, 0, 0, 0)) < 0)
1503  return ret;
1504 
1505  return 0;
1506 }
1507 
1509 {
1510  AVFilterContext *ctx = inlink->dst;
1511  AVFilterLink *outlink = ctx->outputs[0];
1512  DrawTextContext *s = ctx->priv;
1513  int ret;
1514 
1515  if (s->reload) {
1516  if ((ret = load_textfile(ctx)) < 0) {
1517  av_frame_free(&frame);
1518  return ret;
1519  }
1520 #if CONFIG_LIBFRIBIDI
1521  if (s->text_shaping)
1522  if ((ret = shape_text(ctx)) < 0) {
1523  av_frame_free(&frame);
1524  return ret;
1525  }
1526 #endif
1527  }
1528 
1529  s->var_values[VAR_N] = inlink->frame_count_out + s->start_number;
1530  s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1531  NAN : frame->pts * av_q2d(inlink->time_base);
1532 
1533  s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1534  s->var_values[VAR_PKT_POS] = frame->pkt_pos;
1535  s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base);
1536  s->var_values[VAR_PKT_SIZE] = frame->pkt_size;
1537  s->metadata = frame->metadata;
1538 
1540 
1541  av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1542  (int)s->var_values[VAR_N], s->var_values[VAR_T],
1543  (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1544  s->x, s->y);
1545 
1546  return ff_filter_frame(outlink, frame);
1547 }
1548 
1550  {
1551  .name = "default",
1552  .type = AVMEDIA_TYPE_VIDEO,
1553  .filter_frame = filter_frame,
1554  .config_props = config_input,
1555  .needs_writable = 1,
1556  },
1557  { NULL }
1558 };
1559 
1561  {
1562  .name = "default",
1563  .type = AVMEDIA_TYPE_VIDEO,
1564  },
1565  { NULL }
1566 };
1567 
1569  .name = "drawtext",
1570  .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1571  .priv_size = sizeof(DrawTextContext),
1572  .priv_class = &drawtext_class,
1573  .init = init,
1574  .uninit = uninit,
1580 };
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: af_acrusher.c:336
#define av_cold
Definition: attributes.h:88
uint8_t
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1094
Main libavfilter public API header.
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
void av_bprint_strftime(AVBPrint *buf, const char *fmt, const struct tm *tm)
Append a formatted date and time to a print buffer.
Definition: bprint.c:176
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
void av_bprint_clear(AVBPrint *buf)
Reset the string to "" but keep internal allocated data.
Definition: bprint.c:227
#define AV_BPRINT_SIZE_UNLIMITED
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
common internal and external API header
#define FFMAX3(a, b, c)
Definition: common.h:104
#define FFMIN(a, b)
Definition: common.h:105
#define GET_UTF8(val, GET_BYTE, ERROR)
Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
Definition: common.h:499
#define FFMAX(a, b)
Definition: common.h:103
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
#define FFDIFFSIGN(x, y)
Comparator.
Definition: common.h:101
#define CONFIG_LIBFONTCONFIG
Definition: config.h:459
#define NULL
Definition: coverity.c:32
#define max(a, b)
Definition: cuda_runtime.h:33
static AVFrame * frame
void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, int x0, int y0, int w, int h)
Blend a rectangle with an uniform color.
Definition: drawutils.c:351
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
Init a draw context.
Definition: drawutils.c:84
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
Prepare a color.
Definition: drawutils.c:137
void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, const uint8_t *mask, int mask_linesize, int mask_w, int mask_h, int l2depth, unsigned endianness, int x0, int y0)
Blend an alpha mask with an uniform color.
Definition: drawutils.c:528
AVFilterFormats * ff_draw_supported_pixel_formats(unsigned flags)
Return the list of pixel formats supported by the draw functions.
Definition: drawutils.c:637
misc drawing utilities
#define FF_DRAW_PROCESS_ALPHA
Process alpha pixel component.
Definition: drawutils.h:61
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:766
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
Definition: eval.c:776
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:685
simple arithmetic expression evaluator
int
Misc file utilities.
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:587
int av_opt_copy(void *dst, const void *src)
Copy options from src object into dest object.
Definition: opt.c:1789
int av_set_options_string(void *ctx, const char *opts, const char *key_val_sep, const char *pairs_sep)
Parse the key/value pairs list in opts.
Definition: opt.c:1479
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:230
@ AV_OPT_TYPE_FLAGS
Definition: opt.h:224
@ AV_OPT_TYPE_INT64
Definition: opt.h:226
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
@ AV_OPT_TYPE_COLOR
Definition: opt.h:240
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:126
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
Definition: random_seed.c:120
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
#define AVERROR_EXTERNAL
Generic error in an external library.
Definition: error.h:57
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:134
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:88
char * av_get_token(const char **buf, const char *term)
Unescape the given string until a non escaped terminating char, and return the token corresponding to...
Definition: avstring.c:151
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
void av_tree_enumerate(AVTreeNode *t, void *opaque, int(*cmp)(void *opaque, void *elem), int(*enu)(void *opaque, void *elem))
Apply enu(opaque, &elem) to all the elements in the tree in a given range.
Definition: tree.c:155
void * av_tree_insert(AVTreeNode **tp, void *key, int(*cmp)(const void *key, const void *b), AVTreeNode **next)
Insert or remove an element.
Definition: tree.c:59
struct AVTreeNode * av_tree_node_alloc(void)
Allocate an AVTreeNode.
Definition: tree.c:34
void av_tree_destroy(AVTreeNode *t)
Definition: tree.c:146
int index
Definition: gxfenc.c:89
const char * key
static const int16_t alpha[]
Definition: ilbcdata.h:55
int i
Definition: input.c:407
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
const char * arg
Definition: jacosubdec.c:66
static void drawtext(AVFrame *pic, int x, int y, const char *txt, uint32_t color)
Definition: af_afir.c:240
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
Definition: file.c:144
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...
Definition: file.c:53
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define llrint(x)
Definition: libm.h:394
#define isnan(x)
Definition: libm.h:340
static av_always_inline av_const double round(double x)
Definition: libm.h:444
#define NAN
Definition: mathematics.h:64
int dummy
Definition: motion.c:64
uint32_t tag
Definition: movenc.c:1600
AVOptions.
int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen, void *log_ctx)
Put the RGBA values that correspond to color_string in rgba_color.
Definition: parseutils.c:354
int av_parse_time(int64_t *timeval, const char *timestr, int duration)
Parse timestr and return in *time a corresponding number of microseconds.
Definition: parseutils.c:587
misc parsing utilities
const char * name
Definition: qsvenc.c:46
var_name
Definition: setts_bsf.c:50
#define FF_ARRAY_ELEMS(a)
const uint8_t * code
Definition: spdifenc.c:413
Describe the class of an AVClass context structure.
Definition: log.h:67
char * value
Definition: dict.h:83
Definition: eval.c:157
An instance of a filter.
Definition: avfilter.h:341
A filter pad used for either input or output.
Definition: internal.h:54
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:411
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int width
Definition: frame.h:376
int64_t pkt_duration
duration of the corresponding packet, expressed in AVStream->time_base units, 0 if unknown.
Definition: frame.h:597
int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:589
int pkt_size
size of the corresponding packet containing the compressed frame.
Definition: frame.h:633
int height
Definition: frame.h:376
AVDictionary * metadata
metadata.
Definition: frame.h:604
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:401
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
AVOption.
Definition: opt.h:248
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
void * elem
Definition: tree.c:28
int start_number
starting frame number for n/frame_num var
Definition: vf_drawtext.c:201
FFDrawColor shadowcolor
shadow color
Definition: vf_drawtext.c:179
int max_glyph_w
max glyph width
Definition: vf_drawtext.c:161
AVExpr * x_pexpr
Definition: vf_drawtext.c:189
FT_Vector * positions
positions for each element in the text
Definition: vf_drawtext.c:156
int x
x position to start drawing text
Definition: vf_drawtext.c:159
AVRational tc_rate
frame rate for timecode
Definition: vf_drawtext.c:197
FT_Stroker stroker
freetype stroker handle
Definition: vf_drawtext.c:185
FFDrawColor bordercolor
border color
Definition: vf_drawtext.c:180
int reinit
tells if the filter is being reinited
Definition: vf_drawtext.c:146
int fix_bounds
do we let it go out of frame bounds - t/f
Definition: vf_drawtext.c:175
uint8_t * fontcolor_expr
fontcolor expression to evaluate
Definition: vf_drawtext.c:153
AVDictionary * metadata
Definition: vf_drawtext.c:205
FFDrawColor boxcolor
background color
Definition: vf_drawtext.c:181
AVExpr * fontsize_pexpr
parsed expressions for fontsize
Definition: vf_drawtext.c:166
uint8_t * fontfile
font to be used
Definition: vf_drawtext.c:150
char * fontsize_expr
expression for fontsize
Definition: vf_drawtext.c:165
AVBPrint expanded_text
used to contain the expanded text
Definition: vf_drawtext.c:152
int max_glyph_h
max glyph height
Definition: vf_drawtext.c:162
double var_values[VAR_VARS_NB]
Definition: vf_drawtext.c:191
FFDrawColor fontcolor
foreground color
Definition: vf_drawtext.c:178
FT_Face face
freetype font face handle
Definition: vf_drawtext.c:184
short int draw_box
draw box around text - true or false
Definition: vf_drawtext.c:171
int use_kerning
font kerning is used - true/false
Definition: vf_drawtext.c:173
AVBPrint expanded_fontcolor
used to contain the expanded fontcolor spec
Definition: vf_drawtext.c:154
FFDrawContext dc
Definition: vf_drawtext.c:177
char * x_expr
expression for x position
Definition: vf_drawtext.c:187
AVExpr * a_pexpr
Definition: vf_drawtext.c:193
struct AVTreeNode * glyphs
rendered glyphs, stored using the UTF-32 char code
Definition: vf_drawtext.c:186
AVLFG prng
random
Definition: vf_drawtext.c:195
char * textfile
file with text to be drawn
Definition: vf_drawtext.c:158
int ft_load_flags
flags used for loading fonts, see FT_LOAD_*
Definition: vf_drawtext.c:155
int exp_mode
expansion mode to use for the text
Definition: vf_drawtext.c:145
unsigned int default_fontsize
default font size to use
Definition: vf_drawtext.c:168
int line_spacing
lines spacing in pixels
Definition: vf_drawtext.c:170
int boxborderw
box border width
Definition: vf_drawtext.c:172
int y
y position to start drawing text
Definition: vf_drawtext.c:160
int reload
reload text file for each frame
Definition: vf_drawtext.c:200
char * y_expr
expression for y position
Definition: vf_drawtext.c:188
uint8_t * text
text to be drawn
Definition: vf_drawtext.c:151
int borderw
border width
Definition: vf_drawtext.c:164
unsigned int fontsize
font size to use
Definition: vf_drawtext.c:167
int64_t basetime
base pts time in the real world for display
Definition: vf_drawtext.c:190
size_t nb_positions
number of elements of positions array
Definition: vf_drawtext.c:157
char * tc_opt_string
specified timecode option string
Definition: vf_drawtext.c:196
int tc24hmax
1 if timecode is wrapped to 24 hours, 0 otherwise
Definition: vf_drawtext.c:199
AVExpr * y_pexpr
parsed expressions for x and y
Definition: vf_drawtext.c:189
AVTimecode tc
timecode context
Definition: vf_drawtext.c:198
int tabsize
tab size
Definition: vf_drawtext.c:174
FT_Library library
freetype font library handle
Definition: vf_drawtext.c:183
const char * name
Definition: vf_drawtext.c:1110
int tag
opaque argument to func
Definition: vf_drawtext.c:1112
int(* func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int)
Definition: vf_drawtext.c:1113
const char * err_msg
Definition: vf_drawtext.c:283
#define av_free(p)
#define av_malloc_array(a, b)
#define av_freep(p)
#define av_log(a,...)
static void error(const char *err)
static uint8_t tmp[11]
Definition: aes_ctr.c:27
FILE * out
Definition: movenc.c:54
AVFormatContext * ctx
Definition: movenc.c:48
#define height
#define width
#define gmtime_r
Definition: time_internal.h:34
#define localtime_r
Definition: time_internal.h:46
int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx)
Parse timecode representation (hh:mm:ss[:;.
Definition: timecode.c:250
char * av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum)
Load timecode string in buf.
Definition: timecode.c:102
Timecode helpers header.
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33
@ AV_TIMECODE_FLAG_24HOURSMAX
timecode wraps after 24 hours
Definition: timecode.h:37
static int64_t pts
void * av_tree_find(const AVTreeNode *t, void *key, int(*cmp)(const void *key, const void *b), void *next[2])
Definition: tree.c:39
A tree container.
int size
const char * b
Definition: vf_curves.c:118
static const struct drawtext_function functions[]
AVFILTER_DEFINE_CLASS(drawtext)
static const AVFilterPad avfilter_vf_drawtext_outputs[]
Definition: vf_drawtext.c:1560
@ VAR_H
Definition: vf_drawtext.c:117
@ VAR_VSUB
Definition: vf_drawtext.c:115
@ VAR_TEXT_H
Definition: vf_drawtext.c:126
@ VAR_DESCENT
Definition: vf_drawtext.c:120
@ VAR_SAR
Definition: vf_drawtext.c:124
@ VAR_MAX_GLYPH_D
Definition: vf_drawtext.c:120
@ VAR_TW
Definition: vf_drawtext.c:127
@ VAR_MAIN_H
Definition: vf_drawtext.c:117
@ VAR_LH
Definition: vf_drawtext.c:116
@ VAR_ASCENT
Definition: vf_drawtext.c:119
@ VAR_TEXT_W
Definition: vf_drawtext.c:127
@ VAR_MAX_GLYPH_A
Definition: vf_drawtext.c:119
@ VAR_MAX_GLYPH_W
Definition: vf_drawtext.c:122
@ VAR_MAIN_W
Definition: vf_drawtext.c:118
@ VAR_N
Definition: vf_drawtext.c:123
@ VAR_W
Definition: vf_drawtext.c:118
@ VAR_w
Definition: vf_drawtext.c:118
@ VAR_VARS_NB
Definition: vf_drawtext.c:134
@ VAR_PICT_TYPE
Definition: vf_drawtext.c:130
@ VAR_TH
Definition: vf_drawtext.c:126
@ VAR_PKT_POS
Definition: vf_drawtext.c:131
@ VAR_HSUB
Definition: vf_drawtext.c:115
@ VAR_X
Definition: vf_drawtext.c:128
@ VAR_DAR
Definition: vf_drawtext.c:114
@ VAR_PKT_SIZE
Definition: vf_drawtext.c:133
@ VAR_T
Definition: vf_drawtext.c:125
@ VAR_h
Definition: vf_drawtext.c:117
@ VAR_Y
Definition: vf_drawtext.c:129
@ VAR_LINE_H
Definition: vf_drawtext.c:116
@ VAR_PKT_DURATION
Definition: vf_drawtext.c:132
@ VAR_MAX_GLYPH_H
Definition: vf_drawtext.c:121
static const AVFilterPad avfilter_vf_drawtext_inputs[]
Definition: vf_drawtext.c:1549
double(* eval_func2)(void *, double a, double b)
Definition: vf_drawtext.c:106
static int load_font_file(AVFilterContext *ctx, const char *path, int index)
Definition: vf_drawtext.c:454
static av_cold int update_fontsize(AVFilterContext *ctx)
Definition: vf_drawtext.c:418
static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:920
static int is_newline(uint32_t c)
Definition: vf_drawtext.c:571
static av_cold int set_fontsize(AVFilterContext *ctx, unsigned int fontsize)
Definition: vf_drawtext.c:384
static const eval_func2 fun2[]
Definition: vf_drawtext.c:108
AVFilter ff_vf_drawtext
Definition: vf_drawtext.c:1568
static int load_textfile(AVFilterContext *ctx)
Definition: vf_drawtext.c:576
static int load_font(AVFilterContext *ctx)
Definition: vf_drawtext.c:554
expansion_mode
Definition: vf_drawtext.c:137
@ EXP_STRFTIME
Definition: vf_drawtext.c:140
@ EXP_NORMAL
Definition: vf_drawtext.c:139
@ EXP_NONE
Definition: vf_drawtext.c:138
static av_cold int parse_fontsize(AVFilterContext *ctx)
Definition: vf_drawtext.c:400
static const AVOption drawtext_options[]
Definition: vf_drawtext.c:211
static int query_formats(AVFilterContext *ctx)
Definition: vf_drawtext.c:789
static int draw_glyphs(DrawTextContext *s, AVFrame *frame, int width, int height, FFDrawColor *color, int x, int y, int borderw)
Definition: vf_drawtext.c:1218
static int config_input(AVFilterLink *inlink)
Definition: vf_drawtext.c:830
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_drawtext.c:1508
#define FT_ERRMSG(e)
#define FLAGS
Definition: vf_drawtext.c:209
static void update_alpha(DrawTextContext *s)
Definition: vf_drawtext.c:1271
static int func_metadata(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:998
static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:989
static int func_strftime(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:1011
static double drand(void *opaque, double min, double max)
Definition: vf_drawtext.c:101
static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)
Definition: vf_drawtext.c:1264
static const char *const var_names[]
Definition: vf_drawtext.c:73
static const char *const fun2_names[]
Definition: vf_drawtext.c:97
static int glyph_cmp(const void *key, const void *b)
Definition: vf_drawtext.c:302
static av_cold int init(AVFilterContext *ctx)
Definition: vf_drawtext.c:693
static int func_pts(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:929
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_drawtext.c:804
static const struct ft_error ft_errors[]
static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:1047
#define OFFSET(x)
Definition: vf_drawtext.c:208
static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv)
Definition: vf_drawtext.c:1128
static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
Definition: vf_drawtext.c:1195
static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:1027
static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
Definition: vf_drawtext.c:1155
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
Load glyphs corresponding to the UTF-32 codepoint code.
Definition: vf_drawtext.c:316
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:873
static int glyph_enu_free(void *opaque, void *elem)
Definition: vf_drawtext.c:794
static int draw_text(AVFilterContext *ctx, AVFrame *frame, int width, int height)
Definition: vf_drawtext.c:1286
static av_always_inline int diff(const uint32_t a, const uint32_t b)
static const uint16_t positions[][14][3]
float delta
float min
int len
static double c[64]