FFmpeg  2.1.1
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 <sys/time.h>
30 #include <time.h>
31 
32 #include "config.h"
33 #include "libavutil/avstring.h"
34 #include "libavutil/bprint.h"
35 #include "libavutil/common.h"
36 #include "libavutil/file.h"
37 #include "libavutil/eval.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/random_seed.h"
40 #include "libavutil/parseutils.h"
41 #include "libavutil/timecode.h"
42 #include "libavutil/tree.h"
43 #include "libavutil/lfg.h"
44 #include "avfilter.h"
45 #include "drawutils.h"
46 #include "formats.h"
47 #include "internal.h"
48 #include "video.h"
49 
50 #include <ft2build.h>
51 #include <config/ftheader.h>
52 #include FT_FREETYPE_H
53 #include FT_GLYPH_H
54 #if CONFIG_FONTCONFIG
55 #include <fontconfig/fontconfig.h>
56 #endif
57 
58 static const char *const var_names[] = {
59  "dar",
60  "hsub", "vsub",
61  "line_h", "lh", ///< line height, same as max_glyph_h
62  "main_h", "h", "H", ///< height of the input video
63  "main_w", "w", "W", ///< width of the input video
64  "max_glyph_a", "ascent", ///< max glyph ascent
65  "max_glyph_d", "descent", ///< min glyph descent
66  "max_glyph_h", ///< max glyph height
67  "max_glyph_w", ///< max glyph width
68  "n", ///< number of frame
69  "sar",
70  "t", ///< timestamp expressed in seconds
71  "text_h", "th", ///< height of the rendered text
72  "text_w", "tw", ///< width of the rendered text
73  "x",
74  "y",
75  "pict_type",
76  NULL
77 };
78 
79 static const char *const fun2_names[] = {
80  "rand"
81 };
82 
83 static double drand(void *opaque, double min, double max)
84 {
85  return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
86 }
87 
88 typedef double (*eval_func2)(void *, double a, double b);
89 
90 static const eval_func2 fun2[] = {
91  drand,
92  NULL
93 };
94 
95 enum var_name {
114 };
115 
120 };
121 
122 typedef struct {
123  const AVClass *class;
124  enum expansion_mode exp_mode; ///< expansion mode to use for the text
125  int reinit; ///< tells if the filter is being reinited
126  uint8_t *fontfile; ///< font to be used
127  uint8_t *text; ///< text to be drawn
128  AVBPrint expanded_text; ///< used to contain the expanded text
129  int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
130  FT_Vector *positions; ///< positions for each element in the text
131  size_t nb_positions; ///< number of elements of positions array
132  char *textfile; ///< file with text to be drawn
133  int x; ///< x position to start drawing text
134  int y; ///< y position to start drawing text
135  int max_glyph_w; ///< max glyph width
136  int max_glyph_h; ///< max glyph height
137  int shadowx, shadowy;
138  unsigned int fontsize; ///< font size to use
139 
140  short int draw_box; ///< draw box around text - true or false
141  int use_kerning; ///< font kerning is used - true/false
142  int tabsize; ///< tab size
143  int fix_bounds; ///< do we let it go out of frame bounds - t/f
144 
146  FFDrawColor fontcolor; ///< foreground color
147  FFDrawColor shadowcolor; ///< shadow color
148  FFDrawColor boxcolor; ///< background color
149 
150  FT_Library library; ///< freetype font library handle
151  FT_Face face; ///< freetype font face handle
152  struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
153  char *x_expr; ///< expression for x position
154  char *y_expr; ///< expression for y position
155  AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
156  int64_t basetime; ///< base pts time in the real world for display
157  double var_values[VAR_VARS_NB];
158 #if FF_API_DRAWTEXT_OLD_TIMELINE
159  char *draw_expr; ///< expression for draw
160  AVExpr *draw_pexpr; ///< parsed expression for draw
161  int draw; ///< set to zero to prevent drawing
162 #endif
163  AVLFG prng; ///< random
164  char *tc_opt_string; ///< specified timecode option string
165  AVRational tc_rate; ///< frame rate for timecode
166  AVTimecode tc; ///< timecode context
167  int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
168  int reload; ///< reload text file for each frame
169  int start_number; ///< starting frame number for n/frame_num var
172 
173 #define OFFSET(x) offsetof(DrawTextContext, x)
174 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
175 
176 static const AVOption drawtext_options[]= {
177  {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
178  {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
179  {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
180  {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
181  {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
182  {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
183  {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
184  {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
185  {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
186  {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
187  {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
188  {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
189  {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
190  {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
191 #if FF_API_DRAWTEXT_OLD_TIMELINE
192  {"draw", "if false do not draw (deprecated)", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
193 #endif
194 
195  {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
196  {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
197  {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
198  {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
199 
200  {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
201  {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
202  {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
203  {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
204  {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
205  {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
206  {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
207  {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
208 
209  /* FT_LOAD_* flags */
210  { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" },
211  { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
212  { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
213  { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
214  { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
215  { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
216  { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
217  { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
218  { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
219  { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
220  { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
221  { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
222  { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
223  { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
224  { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
225  { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
226  { NULL }
227 };
228 
230 
231 #undef __FTERRORS_H__
232 #define FT_ERROR_START_LIST {
233 #define FT_ERRORDEF(e, v, s) { (e), (s) },
234 #define FT_ERROR_END_LIST { 0, NULL } };
235 
236 struct ft_error
237 {
238  int err;
239  const char *err_msg;
240 } static ft_errors[] =
241 #include FT_ERRORS_H
242 
243 #define FT_ERRMSG(e) ft_errors[e].err_msg
244 
245 typedef struct {
246  FT_Glyph *glyph;
247  uint32_t code;
248  FT_Bitmap bitmap; ///< array holding bitmaps of font
249  FT_BBox bbox;
250  int advance;
251  int bitmap_left;
252  int bitmap_top;
253 } Glyph;
254 
255 static int glyph_cmp(void *key, const void *b)
256 {
257  const Glyph *a = key, *bb = b;
258  int64_t diff = (int64_t)a->code - (int64_t)bb->code;
259  return diff > 0 ? 1 : diff < 0 ? -1 : 0;
260 }
261 
262 /**
263  * Load glyphs corresponding to the UTF-32 codepoint code.
264  */
265 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
266 {
267  DrawTextContext *s = ctx->priv;
268  Glyph *glyph;
269  struct AVTreeNode *node = NULL;
270  int ret;
271 
272  /* load glyph into s->face->glyph */
273  if (FT_Load_Char(s->face, code, s->ft_load_flags))
274  return AVERROR(EINVAL);
275 
276  /* save glyph */
277  if (!(glyph = av_mallocz(sizeof(*glyph))) ||
278  !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
279  ret = AVERROR(ENOMEM);
280  goto error;
281  }
282  glyph->code = code;
283 
284  if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
285  ret = AVERROR(EINVAL);
286  goto error;
287  }
288 
289  glyph->bitmap = s->face->glyph->bitmap;
290  glyph->bitmap_left = s->face->glyph->bitmap_left;
291  glyph->bitmap_top = s->face->glyph->bitmap_top;
292  glyph->advance = s->face->glyph->advance.x >> 6;
293 
294  /* measure text height to calculate text_height (or the maximum text height) */
295  FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
296 
297  /* cache the newly created glyph */
298  if (!(node = av_tree_node_alloc())) {
299  ret = AVERROR(ENOMEM);
300  goto error;
301  }
302  av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
303 
304  if (glyph_ptr)
305  *glyph_ptr = glyph;
306  return 0;
307 
308 error:
309  if (glyph)
310  av_freep(&glyph->glyph);
311  av_freep(&glyph);
312  av_freep(&node);
313  return ret;
314 }
315 
316 static int load_font_file(AVFilterContext *ctx, const char *path, int index,
317  const char **error)
318 {
319  DrawTextContext *s = ctx->priv;
320  int err;
321 
322  err = FT_New_Face(s->library, path, index, &s->face);
323  if (err) {
324  *error = FT_ERRMSG(err);
325  return AVERROR(EINVAL);
326  }
327  return 0;
328 }
329 
330 #if CONFIG_FONTCONFIG
331 static int load_font_fontconfig(AVFilterContext *ctx, const char **error)
332 {
333  DrawTextContext *s = ctx->priv;
334  FcConfig *fontconfig;
335  FcPattern *pattern, *fpat;
336  FcResult result = FcResultMatch;
337  FcChar8 *filename;
338  int err, index;
339  double size;
340 
341  fontconfig = FcInitLoadConfigAndFonts();
342  if (!fontconfig) {
343  *error = "impossible to init fontconfig\n";
344  return AVERROR(EINVAL);
345  }
346  pattern = FcNameParse(s->fontfile ? s->fontfile :
347  (uint8_t *)(intptr_t)"default");
348  if (!pattern) {
349  *error = "could not parse fontconfig pattern";
350  return AVERROR(EINVAL);
351  }
352  if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {
353  *error = "could not substitue fontconfig options"; /* very unlikely */
354  return AVERROR(EINVAL);
355  }
356  FcDefaultSubstitute(pattern);
357  fpat = FcFontMatch(fontconfig, pattern, &result);
358  if (!fpat || result != FcResultMatch) {
359  *error = "impossible to find a matching font";
360  return AVERROR(EINVAL);
361  }
362  if (FcPatternGetString (fpat, FC_FILE, 0, &filename) != FcResultMatch ||
363  FcPatternGetInteger(fpat, FC_INDEX, 0, &index ) != FcResultMatch ||
364  FcPatternGetDouble (fpat, FC_SIZE, 0, &size ) != FcResultMatch) {
365  *error = "impossible to find font information";
366  return AVERROR(EINVAL);
367  }
368  av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
369  if (!s->fontsize)
370  s->fontsize = size + 0.5;
371  err = load_font_file(ctx, filename, index, error);
372  if (err)
373  return err;
374  FcPatternDestroy(fpat);
375  FcPatternDestroy(pattern);
376  FcConfigDestroy(fontconfig);
377  return 0;
378 }
379 #endif
380 
381 static int load_font(AVFilterContext *ctx)
382 {
383  DrawTextContext *s = ctx->priv;
384  int err;
385  const char *error = "unknown error\n";
386 
387  /* load the face, and set up the encoding, which is by default UTF-8 */
388  err = load_font_file(ctx, s->fontfile, 0, &error);
389  if (!err)
390  return 0;
391 #if CONFIG_FONTCONFIG
392  err = load_font_fontconfig(ctx, &error);
393  if (!err)
394  return 0;
395 #endif
396  av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
397  s->fontfile, error);
398  return err;
399 }
400 
402 {
403  DrawTextContext *s = ctx->priv;
404  int err;
405  uint8_t *textbuf;
406  size_t textbuf_size;
407 
408  if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
409  av_log(ctx, AV_LOG_ERROR,
410  "The text file '%s' could not be read or is empty\n",
411  s->textfile);
412  return err;
413  }
414 
415  if (!(s->text = av_realloc(s->text, textbuf_size + 1)))
416  return AVERROR(ENOMEM);
417  memcpy(s->text, textbuf, textbuf_size);
418  s->text[textbuf_size] = 0;
419  av_file_unmap(textbuf, textbuf_size);
420 
421  return 0;
422 }
423 
424 static av_cold int init(AVFilterContext *ctx)
425 {
426  int err;
427  DrawTextContext *s = ctx->priv;
428  Glyph *glyph;
429 
430 #if FF_API_DRAWTEXT_OLD_TIMELINE
431  if (s->draw_expr)
432  av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "
433  "you are encouraged to use the generic timeline support through the 'enable' option\n");
434 #endif
435 
436  if (!s->fontfile && !CONFIG_FONTCONFIG) {
437  av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
438  return AVERROR(EINVAL);
439  }
440 
441  if (s->textfile) {
442  if (s->text) {
443  av_log(ctx, AV_LOG_ERROR,
444  "Both text and text file provided. Please provide only one\n");
445  return AVERROR(EINVAL);
446  }
447  if ((err = load_textfile(ctx)) < 0)
448  return err;
449  }
450 
451  if (s->reload && !s->textfile)
452  av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
453 
454  if (s->tc_opt_string) {
456  s->tc_opt_string, ctx);
457  if (ret < 0)
458  return ret;
459  if (s->tc24hmax)
461  if (!s->text)
462  s->text = av_strdup("");
463  }
464 
465  if (!s->text) {
466  av_log(ctx, AV_LOG_ERROR,
467  "Either text, a valid file or a timecode must be provided\n");
468  return AVERROR(EINVAL);
469  }
470 
471  if ((err = FT_Init_FreeType(&(s->library)))) {
472  av_log(ctx, AV_LOG_ERROR,
473  "Could not load FreeType: %s\n", FT_ERRMSG(err));
474  return AVERROR(EINVAL);
475  }
476 
477  err = load_font(ctx);
478  if (err)
479  return err;
480  if (!s->fontsize)
481  s->fontsize = 16;
482  if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
483  av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
484  s->fontsize, FT_ERRMSG(err));
485  return AVERROR(EINVAL);
486  }
487 
488  s->use_kerning = FT_HAS_KERNING(s->face);
489 
490  /* load the fallback glyph with code 0 */
491  load_glyph(ctx, NULL, 0);
492 
493  /* set the tabsize in pixels */
494  if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
495  av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
496  return err;
497  }
498  s->tabsize *= glyph->advance;
499 
500  if (s->exp_mode == EXP_STRFTIME &&
501  (strchr(s->text, '%') || strchr(s->text, '\\')))
502  av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
503 
505 
506  return 0;
507 }
508 
510 {
512  return 0;
513 }
514 
515 static int glyph_enu_free(void *opaque, void *elem)
516 {
517  Glyph *glyph = elem;
518 
519  FT_Done_Glyph(*glyph->glyph);
520  av_freep(&glyph->glyph);
521  av_free(elem);
522  return 0;
523 }
524 
525 static av_cold void uninit(AVFilterContext *ctx)
526 {
527  DrawTextContext *s = ctx->priv;
528 
529  av_expr_free(s->x_pexpr);
530  av_expr_free(s->y_pexpr);
531 #if FF_API_DRAWTEXT_OLD_TIMELINE
533  s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
534 #endif
535  av_freep(&s->positions);
536  s->nb_positions = 0;
537 
538 
539  av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
541  s->glyphs = NULL;
542 
543  FT_Done_Face(s->face);
544  FT_Done_FreeType(s->library);
545 
547 }
548 
549 static inline int is_newline(uint32_t c)
550 {
551  return c == '\n' || c == '\r' || c == '\f' || c == '\v';
552 }
553 
554 static int config_input(AVFilterLink *inlink)
555 {
556  AVFilterContext *ctx = inlink->dst;
557  DrawTextContext *s = ctx->priv;
558  int ret;
559 
560  ff_draw_init(&s->dc, inlink->format, 0);
561  ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
563  ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
564 
565  s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
566  s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
568  s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
569  s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
570  s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
571  s->var_values[VAR_X] = NAN;
572  s->var_values[VAR_Y] = NAN;
573  s->var_values[VAR_T] = NAN;
574 
576 
577  av_expr_free(s->x_pexpr);
578  av_expr_free(s->y_pexpr);
579 #if FF_API_DRAWTEXT_OLD_TIMELINE
581  s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
582 #else
583  s->x_pexpr = s->y_pexpr = NULL;
584 #endif
585 
586  if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
587  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
588  (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
589  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
590 
591  return AVERROR(EINVAL);
592 #if FF_API_DRAWTEXT_OLD_TIMELINE
593  if (s->draw_expr &&
595  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
596  return ret;
597 #endif
598 
599  return 0;
600 }
601 
602 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
603 {
604  DrawTextContext *s = ctx->priv;
605 
606  if (!strcmp(cmd, "reinit")) {
607  int ret;
608  uninit(ctx);
609  s->reinit = 1;
610  if ((ret = init(ctx)) < 0)
611  return ret;
612  return config_input(ctx->inputs[0]);
613  }
614 
615  return AVERROR(ENOSYS);
616 }
617 
619  char *fct, unsigned argc, char **argv, int tag)
620 {
621  DrawTextContext *s = ctx->priv;
622 
624  return 0;
625 }
626 
627 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
628  char *fct, unsigned argc, char **argv, int tag)
629 {
630  DrawTextContext *s = ctx->priv;
631 
632  av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
633  return 0;
634 }
635 
637  char *fct, unsigned argc, char **argv, int tag)
638 {
639  DrawTextContext *s = ctx->priv;
640 
641  av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
642  return 0;
643 }
644 
646  char *fct, unsigned argc, char **argv, int tag)
647 {
648  DrawTextContext *s = ctx->priv;
649  AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
650 
651  if (e && e->value)
652  av_bprintf(bp, "%s", e->value);
653  return 0;
654 }
655 
656 #if !HAVE_LOCALTIME_R
657 static void localtime_r(const time_t *t, struct tm *tm)
658 {
659  *tm = *localtime(t);
660 }
661 #endif
662 
664  char *fct, unsigned argc, char **argv, int tag)
665 {
666  const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
667  time_t now;
668  struct tm tm;
669 
670  time(&now);
671  if (tag == 'L')
672  localtime_r(&now, &tm);
673  else
674  tm = *gmtime(&now);
675  av_bprint_strftime(bp, fmt, &tm);
676  return 0;
677 }
678 
680  char *fct, unsigned argc, char **argv, int tag)
681 {
682  DrawTextContext *s = ctx->priv;
683  double res;
684  int ret;
685 
686  ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
687  NULL, NULL, fun2_names, fun2,
688  &s->prng, 0, ctx);
689  if (ret < 0)
690  av_log(ctx, AV_LOG_ERROR,
691  "Expression '%s' for the expr text expansion function is not valid\n",
692  argv[0]);
693  else
694  av_bprintf(bp, "%f", res);
695 
696  return ret;
697 }
698 
699 static const struct drawtext_function {
700  const char *name;
701  unsigned argc_min, argc_max;
702  int tag; /**< opaque argument to func */
703  int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
704 } functions[] = {
705  { "expr", 1, 1, 0, func_eval_expr },
706  { "e", 1, 1, 0, func_eval_expr },
707  { "pict_type", 0, 0, 0, func_pict_type },
708  { "pts", 0, 0, 0, func_pts },
709  { "gmtime", 0, 1, 'G', func_strftime },
710  { "localtime", 0, 1, 'L', func_strftime },
711  { "frame_num", 0, 0, 0, func_frame_num },
712  { "n", 0, 0, 0, func_frame_num },
713  { "metadata", 1, 1, 0, func_metadata },
714 };
715 
716 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
717  unsigned argc, char **argv)
718 {
719  unsigned i;
720 
721  for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
722  if (strcmp(fct, functions[i].name))
723  continue;
724  if (argc < functions[i].argc_min) {
725  av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
726  fct, functions[i].argc_min);
727  return AVERROR(EINVAL);
728  }
729  if (argc > functions[i].argc_max) {
730  av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
731  fct, functions[i].argc_max);
732  return AVERROR(EINVAL);
733  }
734  break;
735  }
736  if (i >= FF_ARRAY_ELEMS(functions)) {
737  av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
738  return AVERROR(EINVAL);
739  }
740  return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
741 }
742 
743 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
744 {
745  const char *text = *rtext;
746  char *argv[16] = { NULL };
747  unsigned argc = 0, i;
748  int ret;
749 
750  if (*text != '{') {
751  av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
752  return AVERROR(EINVAL);
753  }
754  text++;
755  while (1) {
756  if (!(argv[argc++] = av_get_token(&text, ":}"))) {
757  ret = AVERROR(ENOMEM);
758  goto end;
759  }
760  if (!*text) {
761  av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
762  ret = AVERROR(EINVAL);
763  goto end;
764  }
765  if (argc == FF_ARRAY_ELEMS(argv))
766  av_freep(&argv[--argc]); /* error will be caught later */
767  if (*text == '}')
768  break;
769  text++;
770  }
771 
772  if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
773  goto end;
774  ret = 0;
775  *rtext = (char *)text + 1;
776 
777 end:
778  for (i = 0; i < argc; i++)
779  av_freep(&argv[i]);
780  return ret;
781 }
782 
783 static int expand_text(AVFilterContext *ctx)
784 {
785  DrawTextContext *s = ctx->priv;
786  char *text = s->text;
787  AVBPrint *bp = &s->expanded_text;
788  int ret;
789 
790  av_bprint_clear(bp);
791  while (*text) {
792  if (*text == '\\' && text[1]) {
793  av_bprint_chars(bp, text[1], 1);
794  text += 2;
795  } else if (*text == '%') {
796  text++;
797  if ((ret = expand_function(ctx, bp, &text)) < 0)
798  return ret;
799  } else {
800  av_bprint_chars(bp, *text, 1);
801  text++;
802  }
803  }
804  if (!av_bprint_is_complete(bp))
805  return AVERROR(ENOMEM);
806  return 0;
807 }
808 
810  int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
811 {
812  char *text = s->expanded_text.str;
813  uint32_t code = 0;
814  int i, x1, y1;
815  uint8_t *p;
816  Glyph *glyph = NULL;
817 
818  for (i = 0, p = text; *p; i++) {
819  Glyph dummy = { 0 };
820  GET_UTF8(code, *p++, continue;);
821 
822  /* skip new line chars, just go to new line */
823  if (code == '\n' || code == '\r' || code == '\t')
824  continue;
825 
826  dummy.code = code;
827  glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
828 
829  if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
830  glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
831  return AVERROR(EINVAL);
832 
833  x1 = s->positions[i].x+s->x+x;
834  y1 = s->positions[i].y+s->y+y;
835 
836  ff_blend_mask(&s->dc, color,
837  frame->data, frame->linesize, width, height,
838  glyph->bitmap.buffer, glyph->bitmap.pitch,
839  glyph->bitmap.width, glyph->bitmap.rows,
840  glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
841  0, x1, y1);
842  }
843 
844  return 0;
845 }
846 
848  int width, int height)
849 {
850  DrawTextContext *s = ctx->priv;
851  AVFilterLink *inlink = ctx->inputs[0];
852 
853  uint32_t code = 0, prev_code = 0;
854  int x = 0, y = 0, i = 0, ret;
855  int max_text_line_w = 0, len;
856  int box_w, box_h;
857  char *text;
858  uint8_t *p;
859  int y_min = 32000, y_max = -32000;
860  int x_min = 32000, x_max = -32000;
861  FT_Vector delta;
862  Glyph *glyph = NULL, *prev_glyph = NULL;
863  Glyph dummy = { 0 };
864 
865  time_t now = time(0);
866  struct tm ltime;
867  AVBPrint *bp = &s->expanded_text;
868 
869  av_bprint_clear(bp);
870 
871  if(s->basetime != AV_NOPTS_VALUE)
872  now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
873 
874  switch (s->exp_mode) {
875  case EXP_NONE:
876  av_bprintf(bp, "%s", s->text);
877  break;
878  case EXP_NORMAL:
879  if ((ret = expand_text(ctx)) < 0)
880  return ret;
881  break;
882  case EXP_STRFTIME:
883  localtime_r(&now, &ltime);
884  av_bprint_strftime(bp, s->text, &ltime);
885  break;
886  }
887 
888  if (s->tc_opt_string) {
889  char tcbuf[AV_TIMECODE_STR_SIZE];
890  av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
891  av_bprint_clear(bp);
892  av_bprintf(bp, "%s%s", s->text, tcbuf);
893  }
894 
895  if (!av_bprint_is_complete(bp))
896  return AVERROR(ENOMEM);
897  text = s->expanded_text.str;
898  if ((len = s->expanded_text.len) > s->nb_positions) {
899  if (!(s->positions =
900  av_realloc(s->positions, len*sizeof(*s->positions))))
901  return AVERROR(ENOMEM);
902  s->nb_positions = len;
903  }
904 
905  x = 0;
906  y = 0;
907 
908  /* load and cache glyphs */
909  for (i = 0, p = text; *p; i++) {
910  GET_UTF8(code, *p++, continue;);
911 
912  /* get glyph */
913  dummy.code = code;
914  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
915  if (!glyph) {
916  load_glyph(ctx, &glyph, code);
917  }
918 
919  y_min = FFMIN(glyph->bbox.yMin, y_min);
920  y_max = FFMAX(glyph->bbox.yMax, y_max);
921  x_min = FFMIN(glyph->bbox.xMin, x_min);
922  x_max = FFMAX(glyph->bbox.xMax, x_max);
923  }
924  s->max_glyph_h = y_max - y_min;
925  s->max_glyph_w = x_max - x_min;
926 
927  /* compute and save position for each glyph */
928  glyph = NULL;
929  for (i = 0, p = text; *p; i++) {
930  GET_UTF8(code, *p++, continue;);
931 
932  /* skip the \n in the sequence \r\n */
933  if (prev_code == '\r' && code == '\n')
934  continue;
935 
936  prev_code = code;
937  if (is_newline(code)) {
938 
939  max_text_line_w = FFMAX(max_text_line_w, x);
940  y += s->max_glyph_h;
941  x = 0;
942  continue;
943  }
944 
945  /* get glyph */
946  prev_glyph = glyph;
947  dummy.code = code;
948  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
949 
950  /* kerning */
951  if (s->use_kerning && prev_glyph && glyph->code) {
952  FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
953  ft_kerning_default, &delta);
954  x += delta.x >> 6;
955  }
956 
957  /* save position */
958  s->positions[i].x = x + glyph->bitmap_left;
959  s->positions[i].y = y - glyph->bitmap_top + y_max;
960  if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
961  else x += glyph->advance;
962  }
963 
964  max_text_line_w = FFMAX(x, max_text_line_w);
965 
966  s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
968 
971  s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
973 
975 
976  s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
977  s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
978  s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
979 #if FF_API_DRAWTEXT_OLD_TIMELINE
980  if (s->draw_pexpr){
981  s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);
982 
983  if(!s->draw)
984  return 0;
985  }
986  if (ctx->is_disabled)
987  return 0;
988 #endif
989 
990  box_w = FFMIN(width - 1 , max_text_line_w);
991  box_h = FFMIN(height - 1, y + s->max_glyph_h);
992 
993  /* draw box */
994  if (s->draw_box)
995  ff_blend_rectangle(&s->dc, &s->boxcolor,
996  frame->data, frame->linesize, width, height,
997  s->x, s->y, box_w, box_h);
998 
999  if (s->shadowx || s->shadowy) {
1000  if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba,
1001  &s->shadowcolor, s->shadowx, s->shadowy)) < 0)
1002  return ret;
1003  }
1004 
1005  if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba,
1006  &s->fontcolor, 0, 0)) < 0)
1007  return ret;
1008 
1009  return 0;
1010 }
1011 
1013 {
1014  AVFilterContext *ctx = inlink->dst;
1015  AVFilterLink *outlink = ctx->outputs[0];
1016  DrawTextContext *s = ctx->priv;
1017  int ret;
1018 
1019  if (s->reload)
1020  if ((ret = load_textfile(ctx)) < 0)
1021  return ret;
1022 
1023  s->var_values[VAR_N] = inlink->frame_count+s->start_number;
1024  s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1025  NAN : frame->pts * av_q2d(inlink->time_base);
1026 
1027  s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1028  s->metadata = av_frame_get_metadata(frame);
1029 
1030  draw_text(ctx, frame, frame->width, frame->height);
1031 
1032  av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1033  (int)s->var_values[VAR_N], s->var_values[VAR_T],
1034  (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1035  s->x, s->y);
1036 
1037  return ff_filter_frame(outlink, frame);
1038 }
1039 
1041  {
1042  .name = "default",
1043  .type = AVMEDIA_TYPE_VIDEO,
1044  .filter_frame = filter_frame,
1045  .config_props = config_input,
1046  .needs_writable = 1,
1047  },
1048  { NULL }
1049 };
1050 
1052  {
1053  .name = "default",
1054  .type = AVMEDIA_TYPE_VIDEO,
1055  },
1056  { NULL }
1057 };
1058 
1060  .name = "drawtext",
1061  .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1062  .priv_size = sizeof(DrawTextContext),
1063  .priv_class = &drawtext_class,
1064  .init = init,
1065  .uninit = uninit,
1067  .inputs = avfilter_vf_drawtext_inputs,
1068  .outputs = avfilter_vf_drawtext_outputs,
1072 #else
1074 #endif
1075 };
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
const char * name
Definition: avisynth_c.h:675
Definition: lfg.h:25
void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color, uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, 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:446
AVFilterFormats * ff_draw_supported_pixel_formats(unsigned flags)
Return the list of pixel formats supported by the draw functions.
Definition: drawutils.c:518
int draw
set to zero to prevent drawing
Definition: vf_drawtext.c:161
static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:636
char * y_expr
expression for y position
Definition: vf_drawtext.c:154
const char * s
Definition: avisynth_c.h:668
int size
int tc24hmax
1 if timecode is wrapped to 24 hours, 0 otherwise
Definition: vf_drawtext.c:167
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
AVOption.
Definition: opt.h:253
int x
x position to start drawing text
Definition: vf_drawtext.c:133
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:692
static double drand(void *opaque, double min, double max)
Definition: vf_drawtext.c:83
static int func_metadata(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:645
const char * name
Filter name.
Definition: avfilter.h:468
static const AVOption drawtext_options[]
Definition: vf_drawtext.c:176
const char * fmt
Definition: avisynth_c.h:669
unsigned int fontsize
font size to use
Definition: vf_drawtext.c:138
FFDrawColor boxcolor
background color
Definition: vf_drawtext.c:148
void * priv
private data for use by the filter
Definition: avfilter.h:648
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: avcodec.h:4153
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:111
char * x_expr
expression for x position
Definition: vf_drawtext.c:153
char * av_strdup(const char *s) av_malloc_attrib
Duplicate the string s.
Definition: mem.c:256
uint8_t * fontfile
font to be used
Definition: vf_drawtext.c:126
#define FLAGS
Definition: vf_drawtext.c:174
AVDictionaryEntry * av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:39
int num
numerator
Definition: rational.h:44
static struct drawtext_function functions[]
const char * b
Definition: vf_curves.c:105
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
static int draw_text(AVFilterContext *ctx, AVFrame *frame, int width, int height)
Definition: vf_drawtext.c:847
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:641
uint8_t * text
text to be drawn
Definition: vf_drawtext.c:127
char * tc_opt_string
specified timecode option string
Definition: vf_drawtext.c:164
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:303
#define av_cold
Definition: avcodec.h:653
int is_disabled
the enabled state from the last expression evaluation
Definition: avfilter.h:680
int(* func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int)
Definition: vf_drawtext.c:703
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic &quot;enable&quot; expression option that can be used to enable or disable a fil...
Definition: avfilter.h:445
struct AVTreeNode * av_tree_node_alloc(void)
Allocate an AVTreeNode.
Definition: tree.c:34
expansion_mode
Definition: vf_drawtext.c:116
const char * name
Pad name.
Definition: internal.h:66
AVFilter avfilter_vf_drawtext
Definition: vf_drawtext.c:1059
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:148
static uint8_t * res
Definition: ffhash.c:43
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1118
static int glyph_enu_free(void *opaque, void *elem)
Definition: vf_drawtext.c:515
void * av_tree_find(const AVTreeNode *t, void *key, int(*cmp)(void *key, const void *b), void *next[2])
Definition: tree.c:39
uint8_t
static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:618
static void drawtext(AVFrame *pic, int x, int y, int ftid, const uint8_t *color, const char *fmt,...)
Definition: f_ebur128.c:186
float delta
A tree container.
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:83
AVLFG prng
random
Definition: vf_drawtext.c:163
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:38
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
FT_Face face
freetype font face handle
Definition: vf_drawtext.c:151
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:182
static av_cold int init(AVFilterContext *ctx)
Definition: vf_drawtext.c:424
#define CONFIG_FONTCONFIG
Definition: config.h:314
Definition: eval.c:141
int start_number
starting frame number for n/frame_num var
Definition: vf_drawtext.c:169
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:69
static const AVFilterPad avfilter_vf_drawtext_inputs[]
Definition: vf_drawtext.c:1040
uint32_t tag
Definition: movenc.c:961
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:82
const char * name
Definition: vf_drawtext.c:700
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_drawtext.c:525
timecode wraps after 24 hours
Definition: timecode.h:37
void 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:531
FT_Vector * positions
positions for each element in the text
Definition: vf_drawtext.c:130
AVExpr * x_pexpr
Definition: vf_drawtext.c:155
Definition: vf_blend.c:65
void av_tree_destroy(AVTreeNode *t)
Definition: tree.c:146
static AVFrame * frame
Definition: demuxing.c:51
static void localtime_r(const time_t *t, struct tm *tm)
Definition: vf_drawtext.c:657
A filter pad used for either input or output.
Definition: internal.h:60
char * draw_expr
expression for draw
Definition: vf_drawtext.c:159
void * av_tree_insert(AVTreeNode **tp, void *key, int(*cmp)(void *key, const void *b), AVTreeNode **next)
Insert or remove an element.
Definition: tree.c:59
double var_values[VAR_VARS_NB]
Definition: vf_drawtext.c:157
int width
width and height of the video frame
Definition: frame.h:145
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:219
AVBPrint expanded_text
used to contain the expanded text
Definition: vf_drawtext.c:128
#define AV_BPRINT_SIZE_UNLIMITED
Convenience macros for special values for av_bprint_init() size_max parameter.
Definition: bprint.h:91
AVExpr * y_pexpr
parsed expressions for x and y
Definition: vf_drawtext.c:155
const char * err_msg
Definition: vf_drawtext.c:239
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: avcodec.h:4168
int y
y position to start drawing text
Definition: vf_drawtext.c:134
const char * arg
Definition: jacosubdec.c:69
void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4])
Prepare a color.
Definition: drawutils.c:191
static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
Definition: vf_drawtext.c:743
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
uint8_t vsub_max
Definition: drawutils.h:57
FFDrawColor fontcolor
foreground color
Definition: vf_drawtext.c:146
static const char *const fun2_names[]
Definition: vf_drawtext.c:79
int reload
reload text file for each frame
Definition: vf_drawtext.c:168
FFDrawContext dc
Definition: vf_drawtext.c:145
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Init a print buffer.
Definition: bprint.c:69
#define FF_ARRAY_ELEMS(a)
Definition: avcodec.h:929
Buffer to print data progressively.
Definition: bprint.h:77
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:167
static int av_bprint_is_complete(AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:182
void * av_realloc(void *ptr, size_t size) 1(2)
Allocate or reallocate a block of memory.
Definition: mem.c:141
float y
Definition: vf_blend.c:65
var_name
ret
Definition: avfilter.c:961
int64_t basetime
base pts time in the real world for display
Definition: vf_drawtext.c:156
AVDictionary * av_frame_get_metadata(const AVFrame *frame)
char * value
Definition: dict.h:82
char * av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum)
Load timecode string in buf.
Definition: timecode.c:84
#define FFMIN(a, b)
Definition: avcodec.h:925
int max_glyph_h
max glyph height
Definition: vf_drawtext.c:136
AVRational tc_rate
frame rate for timecode
Definition: vf_drawtext.c:165
AVExpr * draw_pexpr
parsed expression for draw
Definition: vf_drawtext.c:160
int av_expr_parse_and_eval(double *res, 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:702
static int process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: af_atempo.c:1156
static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:679
double(* eval_func2)(void *, double a, double b)
Definition: vf_drawtext.c:88
static int expand_text(AVFilterContext *ctx)
Definition: vf_drawtext.c:783
AVTimecode tc
timecode context
Definition: vf_drawtext.c:166
Main libavfilter public API header.
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:642
static int width
Definition: utils.c:158
#define AV_LOG_INFO
Standard information.
Definition: avcodec.h:4158
misc drawing utilities
void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:30
#define FFMAX(a, b)
Definition: avcodec.h:923
static int draw_glyphs(DrawTextContext *s, AVFrame *frame, int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
Definition: vf_drawtext.c:809
static int load_font(AVFilterContext *ctx)
Definition: vf_drawtext.c:381
#define AV_TIMECODE_STR_SIZE
Definition: timecode.h:33
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:602
uint8_t hsub_max
Definition: drawutils.h:56
BYTE int const BYTE int int int height
Definition: avisynth_c.h:713
Describe the class of an AVClass context structure.
Definition: log.h:50
Filter definition.
Definition: avfilter.h:464
int tabsize
tab size
Definition: vf_drawtext.c:142
int index
Definition: gxfenc.c:89
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:102
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:635
static int func_strftime(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:663
rational number numerator/denominator
Definition: rational.h:43
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:348
struct AVTreeNode * glyphs
rendered glyphs, stored using the UTF-32 char code
Definition: vf_drawtext.c:152
static int is_newline(uint32_t c)
Definition: vf_drawtext.c:549
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags)
Init a draw context.
Definition: drawutils.c:149
void av_bprint_clear(AVBPrint *buf)
Reset the string to &quot;&quot; but keep internal allocated data.
Definition: bprint.c:227
#define AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL
Same as AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, except that the filter will have its filter_frame() c...
Definition: avfilter.h:453
int tag
opaque argument to func
Definition: vf_drawtext.c:702
struct ft_error ft_errors[]
short int draw_box
draw box around text - true or false
Definition: vf_drawtext.c:140
static int config_input(AVFilterLink *inlink)
Definition: vf_drawtext.c:554
static int flags
Definition: cpu.c:45
AVDictionary * metadata
Definition: vf_drawtext.c:170
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:192
static int load_font_file(AVFilterContext *ctx, const char *path, int index, const char **error)
Definition: vf_drawtext.c:316
static const char *const var_names[]
Definition: vf_drawtext.c:58
int use_kerning
font kerning is used - true/false
Definition: vf_drawtext.c:141
#define FF_API_DRAWTEXT_OLD_TIMELINE
Definition: version.h:86
static float t
Definition: muxing.c:123
Definition: vf_blend.c:65
static int glyph_cmp(void *key, const void *b)
Definition: vf_drawtext.c:255
static double c[64]
Definition: vf_blend.c:65
static int query_formats(AVFilterContext *ctx)
Definition: vf_drawtext.c:509
FT_Library library
freetype font library handle
Definition: vf_drawtext.c:150
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
Definition: file.c:129
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_drawtext.c:1012
static const AVFilterPad avfilter_vf_drawtext_outputs[]
Definition: vf_drawtext.c:1051
void av_bprintf(AVBPrint *buf, const char *fmt,...) av_printf_format(2
Append a formatted string to a print buffer.
#define NAN
Definition: math.h:28
int len
#define FT_ERRMSG(e)
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:301
int reinit
tells if the filter is being reinited
Definition: vf_drawtext.c:125
FFDrawColor shadowcolor
shadow color
Definition: vf_drawtext.c:147
#define OFFSET(x)
Definition: vf_drawtext.c:173
#define AVERROR(e)
An instance of a filter.
Definition: avfilter.h:627
int max_glyph_w
max glyph width
Definition: vf_drawtext.c:135
static const eval_func2 fun2[]
Definition: vf_drawtext.c:90
int height
Definition: frame.h:145
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:49
static int func_pts(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag)
Definition: vf_drawtext.c:627
enum expansion_mode exp_mode
expansion mode to use for the text
Definition: vf_drawtext.c:124
int fix_bounds
do we let it go out of frame bounds - t/f
Definition: vf_drawtext.c:143
uint32_t av_get_random_seed(void)
Get a seed to use in conjunction with random functions.
Definition: random_seed.c:106
char * textfile
file with text to be drawn
Definition: vf_drawtext.c:132
internal API functions
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:265
static int load_textfile(AVFilterContext *ctx)
Definition: vf_drawtext.c:401
int dummy
Definition: motion-test.c:64
static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv)
Definition: vf_drawtext.c:716
int ft_load_flags
flags used for loading fonts, see FT_LOAD_*
Definition: vf_drawtext.c:129
uint32_t flags
flags such as drop frame, +24 hours support, ...
Definition: timecode.h:43
void av_tree_enumerate(AVTreeNode *t, void *opaque, int(*cmp)(void *opaque, void *elem), int(*enu)(void *opaque, void *elem))
Apply enu(opaque, &amp;elem) to all the elements in the tree in a given range.
Definition: tree.c:155
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
float min
#define GET_UTF8(val, GET_BYTE, ERROR)
size_t nb_positions
number of elements of positions array
Definition: vf_drawtext.c:131
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avcodec.h:2278
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:241
void * elem
Definition: tree.c:28
uint8_t rgba[4]
Definition: drawutils.h:61