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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"
55 #include "libavutil/tree.h"
56 #include "libavutil/lfg.h"
57 #include "avfilter.h"
58 #include "drawutils.h"
59 #include "formats.h"
60 #include "internal.h"
61 #include "video.h"
62 
63 #if CONFIG_LIBFRIBIDI
64 #include <fribidi.h>
65 #endif
66 
67 #include <ft2build.h>
68 #include FT_FREETYPE_H
69 #include FT_GLYPH_H
70 #include FT_STROKER_H
71 
72 static const char *const var_names[] = {
73  "dar",
74  "hsub", "vsub",
75  "line_h", "lh", ///< line height, same as max_glyph_h
76  "main_h", "h", "H", ///< height of the input video
77  "main_w", "w", "W", ///< width of the input video
78  "max_glyph_a", "ascent", ///< max glyph ascent
79  "max_glyph_d", "descent", ///< min glyph descent
80  "max_glyph_h", ///< max glyph height
81  "max_glyph_w", ///< max glyph width
82  "n", ///< number of frame
83  "sar",
84  "t", ///< timestamp expressed in seconds
85  "text_h", "th", ///< height of the rendered text
86  "text_w", "tw", ///< width of the rendered text
87  "x",
88  "y",
89  "pict_type",
90  NULL
91 };
92 
93 static const char *const fun2_names[] = {
94  "rand"
95 };
96 
97 static double drand(void *opaque, double min, double max)
98 {
99  return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
100 }
101 
102 typedef double (*eval_func2)(void *, double a, double b);
103 
104 static const eval_func2 fun2[] = {
105  drand,
106  NULL
107 };
108 
109 enum var_name {
110  VAR_DAR,
111  VAR_HSUB, VAR_VSUB,
112  VAR_LINE_H, VAR_LH,
113  VAR_MAIN_H, VAR_h, VAR_H,
114  VAR_MAIN_W, VAR_w, VAR_W,
115  VAR_MAX_GLYPH_A, VAR_ASCENT,
116  VAR_MAX_GLYPH_D, VAR_DESCENT,
117  VAR_MAX_GLYPH_H,
118  VAR_MAX_GLYPH_W,
119  VAR_N,
120  VAR_SAR,
121  VAR_T,
122  VAR_TEXT_H, VAR_TH,
123  VAR_TEXT_W, VAR_TW,
124  VAR_X,
125  VAR_Y,
126  VAR_PICT_TYPE,
127  VAR_VARS_NB
128 };
129 
130 enum expansion_mode {
131  EXP_NONE,
132  EXP_NORMAL,
133  EXP_STRFTIME,
134 };
135 
136 typedef struct DrawTextContext {
137  const AVClass *class;
138  enum expansion_mode exp_mode; ///< expansion mode to use for the text
139  int reinit; ///< tells if the filter is being reinited
140 #if CONFIG_LIBFONTCONFIG
141  uint8_t *font; ///< font to be used
142 #endif
143  uint8_t *fontfile; ///< font to be used
144  uint8_t *text; ///< text to be drawn
145  AVBPrint expanded_text; ///< used to contain the expanded text
146  uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate
147  AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec
148  int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
149  FT_Vector *positions; ///< positions for each element in the text
150  size_t nb_positions; ///< number of elements of positions array
151  char *textfile; ///< file with text to be drawn
152  int x; ///< x position to start drawing text
153  int y; ///< y position to start drawing text
154  int max_glyph_w; ///< max glyph width
155  int max_glyph_h; ///< max glyph height
156  int shadowx, shadowy;
157  int borderw; ///< border width
158  unsigned int fontsize; ///< font size to use
159 
160  short int draw_box; ///< draw box around text - true or false
161  int use_kerning; ///< font kerning is used - true/false
162  int tabsize; ///< tab size
163  int fix_bounds; ///< do we let it go out of frame bounds - t/f
164 
165  FFDrawContext dc;
166  FFDrawColor fontcolor; ///< foreground color
167  FFDrawColor shadowcolor; ///< shadow color
168  FFDrawColor bordercolor; ///< border color
169  FFDrawColor boxcolor; ///< background color
170 
171  FT_Library library; ///< freetype font library handle
172  FT_Face face; ///< freetype font face handle
173  FT_Stroker stroker; ///< freetype stroker handle
174  struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
175  char *x_expr; ///< expression for x position
176  char *y_expr; ///< expression for y position
177  AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
178  int64_t basetime; ///< base pts time in the real world for display
179  double var_values[VAR_VARS_NB];
180 #if FF_API_DRAWTEXT_OLD_TIMELINE
181  char *draw_expr; ///< expression for draw
182  AVExpr *draw_pexpr; ///< parsed expression for draw
183  int draw; ///< set to zero to prevent drawing
184 #endif
185  AVLFG prng; ///< random
186  char *tc_opt_string; ///< specified timecode option string
187  AVRational tc_rate; ///< frame rate for timecode
188  AVTimecode tc; ///< timecode context
189  int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
190  int reload; ///< reload text file for each frame
191  int start_number; ///< starting frame number for n/frame_num var
192 #if CONFIG_LIBFRIBIDI
193  int text_shaping; ///< 1 to shape the text before drawing it
194 #endif
195  AVDictionary *metadata;
196 } DrawTextContext;
197 
198 #define OFFSET(x) offsetof(DrawTextContext, x)
199 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
200 
201 static const AVOption drawtext_options[]= {
202  {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
203  {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
204  {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
205  {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
206  {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS},
207  {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
208  {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
209  {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
210  {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
211  {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
212  {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
213  {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
214  {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
215  {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
216  {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
217  {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
218  {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
219 #if FF_API_DRAWTEXT_OLD_TIMELINE
220  {"draw", "if false do not draw (deprecated)", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
221 #endif
222 #if CONFIG_LIBFONTCONFIG
223  { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
224 #endif
225 
226  {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
227  {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
228  {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
229  {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
230 
231  {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
232  {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
233  {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
234  {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
235  {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
236  {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
237  {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
238  {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
239 
240 #if CONFIG_LIBFRIBIDI
241  {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
242 #endif
243 
244  /* FT_LOAD_* flags */
245  { "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" },
246  { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
247  { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
248  { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
249  { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
250  { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
251  { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
252  { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
253  { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
254  { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
255  { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
256  { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
257  { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
258  { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
259  { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
260  { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
261  { NULL }
262 };
263 
264 AVFILTER_DEFINE_CLASS(drawtext);
265 
266 #undef __FTERRORS_H__
267 #define FT_ERROR_START_LIST {
268 #define FT_ERRORDEF(e, v, s) { (e), (s) },
269 #define FT_ERROR_END_LIST { 0, NULL } };
270 
271 static const struct ft_error
272 {
273  int err;
274  const char *err_msg;
275 } ft_errors[] =
276 #include FT_ERRORS_H
277 
278 #define FT_ERRMSG(e) ft_errors[e].err_msg
279 
280 typedef struct Glyph {
281  FT_Glyph glyph;
282  FT_Glyph border_glyph;
283  uint32_t code;
284  FT_Bitmap bitmap; ///< array holding bitmaps of font
285  FT_Bitmap border_bitmap; ///< array holding bitmaps of font border
286  FT_BBox bbox;
287  int advance;
288  int bitmap_left;
289  int bitmap_top;
290 } Glyph;
291 
292 static int glyph_cmp(void *key, const void *b)
293 {
294  const Glyph *a = key, *bb = b;
295  int64_t diff = (int64_t)a->code - (int64_t)bb->code;
296  return diff > 0 ? 1 : diff < 0 ? -1 : 0;
297 }
298 
299 /**
300  * Load glyphs corresponding to the UTF-32 codepoint code.
301  */
302 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
303 {
304  DrawTextContext *s = ctx->priv;
305  FT_BitmapGlyph bitmapglyph;
306  Glyph *glyph;
307  struct AVTreeNode *node = NULL;
308  int ret;
309 
310  /* load glyph into s->face->glyph */
311  if (FT_Load_Char(s->face, code, s->ft_load_flags))
312  return AVERROR(EINVAL);
313 
314  glyph = av_mallocz(sizeof(*glyph));
315  if (!glyph) {
316  ret = AVERROR(ENOMEM);
317  goto error;
318  }
319  glyph->code = code;
320 
321  if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {
322  ret = AVERROR(EINVAL);
323  goto error;
324  }
325  if (s->borderw) {
326  glyph->border_glyph = glyph->glyph;
327  if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||
328  FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
329  ret = AVERROR_EXTERNAL;
330  goto error;
331  }
332  bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;
333  glyph->border_bitmap = bitmapglyph->bitmap;
334  }
335  if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
336  ret = AVERROR_EXTERNAL;
337  goto error;
338  }
339  bitmapglyph = (FT_BitmapGlyph) glyph->glyph;
340 
341  glyph->bitmap = bitmapglyph->bitmap;
342  glyph->bitmap_left = bitmapglyph->left;
343  glyph->bitmap_top = bitmapglyph->top;
344  glyph->advance = s->face->glyph->advance.x >> 6;
345 
346  /* measure text height to calculate text_height (or the maximum text height) */
347  FT_Glyph_Get_CBox(glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
348 
349  /* cache the newly created glyph */
350  if (!(node = av_tree_node_alloc())) {
351  ret = AVERROR(ENOMEM);
352  goto error;
353  }
354  av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
355 
356  if (glyph_ptr)
357  *glyph_ptr = glyph;
358  return 0;
359 
360 error:
361  if (glyph)
362  av_freep(&glyph->glyph);
363 
364  av_freep(&glyph);
365  av_freep(&node);
366  return ret;
367 }
368 
369 static int load_font_file(AVFilterContext *ctx, const char *path, int index)
370 {
371  DrawTextContext *s = ctx->priv;
372  int err;
373 
374  err = FT_New_Face(s->library, path, index, &s->face);
375  if (err) {
376  av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
377  s->fontfile, FT_ERRMSG(err));
378  return AVERROR(EINVAL);
379  }
380  return 0;
381 }
382 
383 #if CONFIG_LIBFONTCONFIG
384 static int load_font_fontconfig(AVFilterContext *ctx)
385 {
386  DrawTextContext *s = ctx->priv;
387  FcConfig *fontconfig;
388  FcPattern *pat, *best;
389  FcResult result = FcResultMatch;
390  FcChar8 *filename;
391  int index;
392  double size;
393  int err = AVERROR(ENOENT);
394 
395  fontconfig = FcInitLoadConfigAndFonts();
396  if (!fontconfig) {
397  av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
398  return AVERROR_UNKNOWN;
399  }
400  pat = FcNameParse(s->fontfile ? s->fontfile :
401  (uint8_t *)(intptr_t)"default");
402  if (!pat) {
403  av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
404  return AVERROR(EINVAL);
405  }
406 
407  FcPatternAddString(pat, FC_FAMILY, s->font);
408  if (s->fontsize)
409  FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
410 
411  FcDefaultSubstitute(pat);
412 
413  if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
414  av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
415  FcPatternDestroy(pat);
416  return AVERROR(ENOMEM);
417  }
418 
419  best = FcFontMatch(fontconfig, pat, &result);
420  FcPatternDestroy(pat);
421 
422  if (!best || result != FcResultMatch) {
423  av_log(ctx, AV_LOG_ERROR,
424  "Cannot find a valid font for the family %s\n",
425  s->font);
426  goto fail;
427  }
428 
429  if (
430  FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
431  FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
432  av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
433  return AVERROR(EINVAL);
434  }
435 
436  if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
437  av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
438  s->font);
439  goto fail;
440  }
441 
442  av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
443  if (!s->fontsize)
444  s->fontsize = size + 0.5;
445 
446  err = load_font_file(ctx, filename, index);
447  if (err)
448  return err;
449  FcConfigDestroy(fontconfig);
450 fail:
451  FcPatternDestroy(best);
452  return err;
453 }
454 #endif
455 
456 static int load_font(AVFilterContext *ctx)
457 {
458  DrawTextContext *s = ctx->priv;
459  int err;
460 
461  /* load the face, and set up the encoding, which is by default UTF-8 */
462  err = load_font_file(ctx, s->fontfile, 0);
463  if (!err)
464  return 0;
465 #if CONFIG_LIBFONTCONFIG
466  err = load_font_fontconfig(ctx);
467  if (!err)
468  return 0;
469 #endif
470  return err;
471 }
472 
473 static int load_textfile(AVFilterContext *ctx)
474 {
475  DrawTextContext *s = ctx->priv;
476  int err;
477  uint8_t *textbuf;
478  uint8_t *tmp;
479  size_t textbuf_size;
480 
481  if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
482  av_log(ctx, AV_LOG_ERROR,
483  "The text file '%s' could not be read or is empty\n",
484  s->textfile);
485  return err;
486  }
487 
488  if (!(tmp = av_realloc(s->text, textbuf_size + 1))) {
489  av_file_unmap(textbuf, textbuf_size);
490  return AVERROR(ENOMEM);
491  }
492  s->text = tmp;
493  memcpy(s->text, textbuf, textbuf_size);
494  s->text[textbuf_size] = 0;
495  av_file_unmap(textbuf, textbuf_size);
496 
497  return 0;
498 }
499 
500 static inline int is_newline(uint32_t c)
501 {
502  return c == '\n' || c == '\r' || c == '\f' || c == '\v';
503 }
504 
505 #if CONFIG_LIBFRIBIDI
506 static int shape_text(AVFilterContext *ctx)
507 {
508  DrawTextContext *s = ctx->priv;
509  uint8_t *tmp;
510  int ret = AVERROR(ENOMEM);
511  static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |
512  FRIBIDI_FLAGS_ARABIC;
513  FriBidiChar *unicodestr = NULL;
514  FriBidiStrIndex len;
515  FriBidiParType direction = FRIBIDI_PAR_LTR;
516  FriBidiStrIndex line_start = 0;
517  FriBidiStrIndex line_end = 0;
518  FriBidiLevel *embedding_levels = NULL;
519  FriBidiArabicProp *ar_props = NULL;
520  FriBidiCharType *bidi_types = NULL;
521  FriBidiStrIndex i,j;
522 
523  len = strlen(s->text);
524  if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) {
525  goto out;
526  }
527  len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,
528  s->text, len, unicodestr);
529 
530  bidi_types = av_malloc_array(len, sizeof(*bidi_types));
531  if (!bidi_types) {
532  goto out;
533  }
534 
535  fribidi_get_bidi_types(unicodestr, len, bidi_types);
536 
537  embedding_levels = av_malloc_array(len, sizeof(*embedding_levels));
538  if (!embedding_levels) {
539  goto out;
540  }
541 
542  if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction,
543  embedding_levels)) {
544  goto out;
545  }
546 
547  ar_props = av_malloc_array(len, sizeof(*ar_props));
548  if (!ar_props) {
549  goto out;
550  }
551 
552  fribidi_get_joining_types(unicodestr, len, ar_props);
553  fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props);
554  fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr);
555 
556  for (line_end = 0, line_start = 0; line_end < len; line_end++) {
557  if (is_newline(unicodestr[line_end]) || line_end == len - 1) {
558  if (!fribidi_reorder_line(flags, bidi_types,
559  line_end - line_start + 1, line_start,
560  direction, embedding_levels, unicodestr,
561  NULL)) {
562  goto out;
563  }
564  line_start = line_end + 1;
565  }
566  }
567 
568  /* Remove zero-width fill chars put in by libfribidi */
569  for (i = 0, j = 0; i < len; i++)
570  if (unicodestr[i] != FRIBIDI_CHAR_FILL)
571  unicodestr[j++] = unicodestr[i];
572  len = j;
573 
574  if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) {
575  /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */
576  goto out;
577  }
578 
579  s->text = tmp;
580  len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,
581  unicodestr, len, s->text);
582  ret = 0;
583 
584 out:
585  av_free(unicodestr);
586  av_free(embedding_levels);
587  av_free(ar_props);
588  av_free(bidi_types);
589  return ret;
590 }
591 #endif
592 
593 static av_cold int init(AVFilterContext *ctx)
594 {
595  int err;
596  DrawTextContext *s = ctx->priv;
597  Glyph *glyph;
598 
599 #if FF_API_DRAWTEXT_OLD_TIMELINE
600  if (s->draw_expr)
601  av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "
602  "you are encouraged to use the generic timeline support through the 'enable' option\n");
603 #endif
604 
605  if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
606  av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
607  return AVERROR(EINVAL);
608  }
609 
610  if (s->textfile) {
611  if (s->text) {
612  av_log(ctx, AV_LOG_ERROR,
613  "Both text and text file provided. Please provide only one\n");
614  return AVERROR(EINVAL);
615  }
616  if ((err = load_textfile(ctx)) < 0)
617  return err;
618  }
619 
620 #if CONFIG_LIBFRIBIDI
621  if (s->text_shaping)
622  if ((err = shape_text(ctx)) < 0)
623  return err;
624 #endif
625 
626  if (s->reload && !s->textfile)
627  av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
628 
629  if (s->tc_opt_string) {
630  int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
631  s->tc_opt_string, ctx);
632  if (ret < 0)
633  return ret;
634  if (s->tc24hmax)
635  s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
636  if (!s->text)
637  s->text = av_strdup("");
638  }
639 
640  if (!s->text) {
641  av_log(ctx, AV_LOG_ERROR,
642  "Either text, a valid file or a timecode must be provided\n");
643  return AVERROR(EINVAL);
644  }
645 
646  if ((err = FT_Init_FreeType(&(s->library)))) {
647  av_log(ctx, AV_LOG_ERROR,
648  "Could not load FreeType: %s\n", FT_ERRMSG(err));
649  return AVERROR(EINVAL);
650  }
651 
652  err = load_font(ctx);
653  if (err)
654  return err;
655  if (!s->fontsize)
656  s->fontsize = 16;
657  if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
658  av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
659  s->fontsize, FT_ERRMSG(err));
660  return AVERROR(EINVAL);
661  }
662 
663  if (s->borderw) {
664  if (FT_Stroker_New(s->library, &s->stroker)) {
665  av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");
666  return AVERROR_EXTERNAL;
667  }
668  FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
669  FT_STROKER_LINEJOIN_ROUND, 0);
670  }
671 
672  s->use_kerning = FT_HAS_KERNING(s->face);
673 
674  /* load the fallback glyph with code 0 */
675  load_glyph(ctx, NULL, 0);
676 
677  /* set the tabsize in pixels */
678  if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
679  av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
680  return err;
681  }
682  s->tabsize *= glyph->advance;
683 
684  if (s->exp_mode == EXP_STRFTIME &&
685  (strchr(s->text, '%') || strchr(s->text, '\\')))
686  av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
687 
688  av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
689  av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED);
690 
691  return 0;
692 }
693 
694 static int query_formats(AVFilterContext *ctx)
695 {
696  ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
697  return 0;
698 }
699 
700 static int glyph_enu_free(void *opaque, void *elem)
701 {
702  Glyph *glyph = elem;
703 
704  FT_Done_Glyph(glyph->glyph);
705  FT_Done_Glyph(glyph->border_glyph);
706  av_free(elem);
707  return 0;
708 }
709 
710 static av_cold void uninit(AVFilterContext *ctx)
711 {
712  DrawTextContext *s = ctx->priv;
713 
714  av_expr_free(s->x_pexpr);
715  av_expr_free(s->y_pexpr);
716 #if FF_API_DRAWTEXT_OLD_TIMELINE
717  av_expr_free(s->draw_pexpr);
718  s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
719 #endif
720  av_freep(&s->positions);
721  s->nb_positions = 0;
722 
723 
724  av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
725  av_tree_destroy(s->glyphs);
726  s->glyphs = NULL;
727 
728  FT_Done_Face(s->face);
729  FT_Stroker_Done(s->stroker);
730  FT_Done_FreeType(s->library);
731 
732  av_bprint_finalize(&s->expanded_text, NULL);
733  av_bprint_finalize(&s->expanded_fontcolor, NULL);
734 }
735 
736 static int config_input(AVFilterLink *inlink)
737 {
738  AVFilterContext *ctx = inlink->dst;
739  DrawTextContext *s = ctx->priv;
740  int ret;
741 
742  ff_draw_init(&s->dc, inlink->format, 0);
743  ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
744  ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
745  ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
746  ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
747 
748  s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
749  s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
750  s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
751  s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
752  s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
753  s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
754  s->var_values[VAR_X] = NAN;
755  s->var_values[VAR_Y] = NAN;
756  s->var_values[VAR_T] = NAN;
757 
758  av_lfg_init(&s->prng, av_get_random_seed());
759 
760  av_expr_free(s->x_pexpr);
761  av_expr_free(s->y_pexpr);
762 #if FF_API_DRAWTEXT_OLD_TIMELINE
763  av_expr_free(s->draw_pexpr);
764  s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
765 #else
766  s->x_pexpr = s->y_pexpr = NULL;
767 #endif
768 
769  if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
770  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
771  (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
772  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
773 
774  return AVERROR(EINVAL);
775 #if FF_API_DRAWTEXT_OLD_TIMELINE
776  if (s->draw_expr &&
777  (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,
778  NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
779  return ret;
780 #endif
781 
782  return 0;
783 }
784 
785 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
786 {
787  DrawTextContext *s = ctx->priv;
788 
789  if (!strcmp(cmd, "reinit")) {
790  int ret;
791  uninit(ctx);
792  s->reinit = 1;
793  if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
794  return ret;
795  if ((ret = init(ctx)) < 0)
796  return ret;
797  return config_input(ctx->inputs[0]);
798  }
799 
800  return AVERROR(ENOSYS);
801 }
802 
803 static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
804  char *fct, unsigned argc, char **argv, int tag)
805 {
806  DrawTextContext *s = ctx->priv;
807 
808  av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
809  return 0;
810 }
811 
812 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
813  char *fct, unsigned argc, char **argv, int tag)
814 {
815  DrawTextContext *s = ctx->priv;
816  const char *fmt;
817  double pts = s->var_values[VAR_T];
818  int ret;
819 
820  fmt = argc >= 1 ? argv[0] : "flt";
821  if (argc >= 2) {
822  int64_t delta;
823  if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
824  av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
825  return ret;
826  }
827  pts += (double)delta / AV_TIME_BASE;
828  }
829  if (!strcmp(fmt, "flt")) {
830  av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
831  } else if (!strcmp(fmt, "hms")) {
832  if (isnan(pts)) {
833  av_bprintf(bp, " ??:??:??.???");
834  } else {
835  int64_t ms = round(pts * 1000);
836  char sign = ' ';
837  if (ms < 0) {
838  sign = '-';
839  ms = -ms;
840  }
841  av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
842  (int)(ms / (60 * 60 * 1000)),
843  (int)(ms / (60 * 1000)) % 60,
844  (int)(ms / 1000) % 60,
845  (int)ms % 1000);
846  }
847  } else {
848  av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
849  return AVERROR(EINVAL);
850  }
851  return 0;
852 }
853 
854 static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
855  char *fct, unsigned argc, char **argv, int tag)
856 {
857  DrawTextContext *s = ctx->priv;
858 
859  av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
860  return 0;
861 }
862 
863 static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
864  char *fct, unsigned argc, char **argv, int tag)
865 {
866  DrawTextContext *s = ctx->priv;
867  AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
868 
869  if (e && e->value)
870  av_bprintf(bp, "%s", e->value);
871  return 0;
872 }
873 
874 #if !HAVE_LOCALTIME_R
875 static void localtime_r(const time_t *t, struct tm *tm)
876 {
877  *tm = *localtime(t);
878 }
879 #endif
880 
881 static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
882  char *fct, unsigned argc, char **argv, int tag)
883 {
884  const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
885  time_t now;
886  struct tm tm;
887 
888  time(&now);
889  if (tag == 'L')
890  localtime_r(&now, &tm);
891  else
892  tm = *gmtime(&now);
893  av_bprint_strftime(bp, fmt, &tm);
894  return 0;
895 }
896 
897 static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
898  char *fct, unsigned argc, char **argv, int tag)
899 {
900  DrawTextContext *s = ctx->priv;
901  double res;
902  int ret;
903 
904  ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
905  NULL, NULL, fun2_names, fun2,
906  &s->prng, 0, ctx);
907  if (ret < 0)
908  av_log(ctx, AV_LOG_ERROR,
909  "Expression '%s' for the expr text expansion function is not valid\n",
910  argv[0]);
911  else
912  av_bprintf(bp, "%f", res);
913 
914  return ret;
915 }
916 
917 static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,
918  char *fct, unsigned argc, char **argv, int tag)
919 {
920  DrawTextContext *s = ctx->priv;
921  double res;
922  int intval;
923  int ret;
924  unsigned int positions = 0;
925  char fmt_str[30] = "%";
926 
927  /*
928  * argv[0] expression to be converted to `int`
929  * argv[1] format: 'x', 'X', 'd' or 'u'
930  * argv[2] positions printed (optional)
931  */
932 
933  ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
934  NULL, NULL, fun2_names, fun2,
935  &s->prng, 0, ctx);
936  if (ret < 0) {
937  av_log(ctx, AV_LOG_ERROR,
938  "Expression '%s' for the expr text expansion function is not valid\n",
939  argv[0]);
940  return ret;
941  }
942 
943  if (!strchr("xXdu", argv[1][0])) {
944  av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
945  " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
946  return AVERROR(EINVAL);
947  }
948 
949  if (argc == 3) {
950  ret = sscanf(argv[2], "%u", &positions);
951  if (ret != 1) {
952  av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
953  " to print: '%s'\n", argv[2]);
954  return AVERROR(EINVAL);
955  }
956  }
957 
958  feclearexcept(FE_ALL_EXCEPT);
959  intval = res;
960  if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
961  av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
962  return AVERROR(EINVAL);
963  }
964 
965  if (argc == 3)
966  av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
967  av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
968 
969  av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
970  res, argv[0], fmt_str);
971 
972  av_bprintf(bp, fmt_str, intval);
973 
974  return 0;
975 }
976 
977 static const struct drawtext_function {
978  const char *name;
979  unsigned argc_min, argc_max;
980  int tag; /**< opaque argument to func */
981  int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
982 } functions[] = {
983  { "expr", 1, 1, 0, func_eval_expr },
984  { "e", 1, 1, 0, func_eval_expr },
985  { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
986  { "eif", 2, 3, 0, func_eval_expr_int_format },
987  { "pict_type", 0, 0, 0, func_pict_type },
988  { "pts", 0, 2, 0, func_pts },
989  { "gmtime", 0, 1, 'G', func_strftime },
990  { "localtime", 0, 1, 'L', func_strftime },
991  { "frame_num", 0, 0, 0, func_frame_num },
992  { "n", 0, 0, 0, func_frame_num },
993  { "metadata", 1, 1, 0, func_metadata },
994 };
995 
996 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
997  unsigned argc, char **argv)
998 {
999  unsigned i;
1000 
1001  for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
1002  if (strcmp(fct, functions[i].name))
1003  continue;
1004  if (argc < functions[i].argc_min) {
1005  av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
1006  fct, functions[i].argc_min);
1007  return AVERROR(EINVAL);
1008  }
1009  if (argc > functions[i].argc_max) {
1010  av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
1011  fct, functions[i].argc_max);
1012  return AVERROR(EINVAL);
1013  }
1014  break;
1015  }
1016  if (i >= FF_ARRAY_ELEMS(functions)) {
1017  av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
1018  return AVERROR(EINVAL);
1019  }
1020  return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
1021 }
1022 
1023 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
1024 {
1025  const char *text = *rtext;
1026  char *argv[16] = { NULL };
1027  unsigned argc = 0, i;
1028  int ret;
1029 
1030  if (*text != '{') {
1031  av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
1032  return AVERROR(EINVAL);
1033  }
1034  text++;
1035  while (1) {
1036  if (!(argv[argc++] = av_get_token(&text, ":}"))) {
1037  ret = AVERROR(ENOMEM);
1038  goto end;
1039  }
1040  if (!*text) {
1041  av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
1042  ret = AVERROR(EINVAL);
1043  goto end;
1044  }
1045  if (argc == FF_ARRAY_ELEMS(argv))
1046  av_freep(&argv[--argc]); /* error will be caught later */
1047  if (*text == '}')
1048  break;
1049  text++;
1050  }
1051 
1052  if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
1053  goto end;
1054  ret = 0;
1055  *rtext = (char *)text + 1;
1056 
1057 end:
1058  for (i = 0; i < argc; i++)
1059  av_freep(&argv[i]);
1060  return ret;
1061 }
1062 
1063 static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
1064 {
1065  int ret;
1066 
1067  av_bprint_clear(bp);
1068  while (*text) {
1069  if (*text == '\\' && text[1]) {
1070  av_bprint_chars(bp, text[1], 1);
1071  text += 2;
1072  } else if (*text == '%') {
1073  text++;
1074  if ((ret = expand_function(ctx, bp, &text)) < 0)
1075  return ret;
1076  } else {
1077  av_bprint_chars(bp, *text, 1);
1078  text++;
1079  }
1080  }
1081  if (!av_bprint_is_complete(bp))
1082  return AVERROR(ENOMEM);
1083  return 0;
1084 }
1085 
1086 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
1087  int width, int height,
1088  FFDrawColor *color, int x, int y, int borderw)
1089 {
1090  char *text = s->expanded_text.str;
1091  uint32_t code = 0;
1092  int i, x1, y1;
1093  uint8_t *p;
1094  Glyph *glyph = NULL;
1095 
1096  for (i = 0, p = text; *p; i++) {
1097  FT_Bitmap bitmap;
1098  Glyph dummy = { 0 };
1099  GET_UTF8(code, *p++, continue;);
1100 
1101  /* skip new line chars, just go to new line */
1102  if (code == '\n' || code == '\r' || code == '\t')
1103  continue;
1104 
1105  dummy.code = code;
1106  glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
1107 
1108  bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
1109 
1110  if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
1111  glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
1112  return AVERROR(EINVAL);
1113 
1114  x1 = s->positions[i].x+s->x+x - borderw;
1115  y1 = s->positions[i].y+s->y+y - borderw;
1116 
1117  ff_blend_mask(&s->dc, color,
1118  frame->data, frame->linesize, width, height,
1119  bitmap.buffer, bitmap.pitch,
1120  bitmap.width, bitmap.rows,
1121  bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
1122  0, x1, y1);
1123  }
1124 
1125  return 0;
1126 }
1127 
1128 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
1129  int width, int height)
1130 {
1131  DrawTextContext *s = ctx->priv;
1132  AVFilterLink *inlink = ctx->inputs[0];
1133 
1134  uint32_t code = 0, prev_code = 0;
1135  int x = 0, y = 0, i = 0, ret;
1136  int max_text_line_w = 0, len;
1137  int box_w, box_h;
1138  char *text;
1139  uint8_t *p;
1140  int y_min = 32000, y_max = -32000;
1141  int x_min = 32000, x_max = -32000;
1142  FT_Vector delta;
1143  Glyph *glyph = NULL, *prev_glyph = NULL;
1144  Glyph dummy = { 0 };
1145 
1146  time_t now = time(0);
1147  struct tm ltime;
1148  AVBPrint *bp = &s->expanded_text;
1149 
1150  av_bprint_clear(bp);
1151 
1152  if(s->basetime != AV_NOPTS_VALUE)
1153  now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
1154 
1155  switch (s->exp_mode) {
1156  case EXP_NONE:
1157  av_bprintf(bp, "%s", s->text);
1158  break;
1159  case EXP_NORMAL:
1160  if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
1161  return ret;
1162  break;
1163  case EXP_STRFTIME:
1164  localtime_r(&now, &ltime);
1165  av_bprint_strftime(bp, s->text, &ltime);
1166  break;
1167  }
1168 
1169  if (s->tc_opt_string) {
1170  char tcbuf[AV_TIMECODE_STR_SIZE];
1171  av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
1172  av_bprint_clear(bp);
1173  av_bprintf(bp, "%s%s", s->text, tcbuf);
1174  }
1175 
1176  if (!av_bprint_is_complete(bp))
1177  return AVERROR(ENOMEM);
1178  text = s->expanded_text.str;
1179  if ((len = s->expanded_text.len) > s->nb_positions) {
1180  if (!(s->positions =
1181  av_realloc(s->positions, len*sizeof(*s->positions))))
1182  return AVERROR(ENOMEM);
1183  s->nb_positions = len;
1184  }
1185 
1186  if (s->fontcolor_expr[0]) {
1187  /* If expression is set, evaluate and replace the static value */
1188  av_bprint_clear(&s->expanded_fontcolor);
1189  if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
1190  return ret;
1191  if (!av_bprint_is_complete(&s->expanded_fontcolor))
1192  return AVERROR(ENOMEM);
1193  av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);
1194  ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);
1195  if (ret)
1196  return ret;
1197  ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
1198  }
1199 
1200  x = 0;
1201  y = 0;
1202 
1203  /* load and cache glyphs */
1204  for (i = 0, p = text; *p; i++) {
1205  GET_UTF8(code, *p++, continue;);
1206 
1207  /* get glyph */
1208  dummy.code = code;
1209  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1210  if (!glyph) {
1211  load_glyph(ctx, &glyph, code);
1212  }
1213 
1214  y_min = FFMIN(glyph->bbox.yMin, y_min);
1215  y_max = FFMAX(glyph->bbox.yMax, y_max);
1216  x_min = FFMIN(glyph->bbox.xMin, x_min);
1217  x_max = FFMAX(glyph->bbox.xMax, x_max);
1218  }
1219  s->max_glyph_h = y_max - y_min;
1220  s->max_glyph_w = x_max - x_min;
1221 
1222  /* compute and save position for each glyph */
1223  glyph = NULL;
1224  for (i = 0, p = text; *p; i++) {
1225  GET_UTF8(code, *p++, continue;);
1226 
1227  /* skip the \n in the sequence \r\n */
1228  if (prev_code == '\r' && code == '\n')
1229  continue;
1230 
1231  prev_code = code;
1232  if (is_newline(code)) {
1233 
1234  max_text_line_w = FFMAX(max_text_line_w, x);
1235  y += s->max_glyph_h;
1236  x = 0;
1237  continue;
1238  }
1239 
1240  /* get glyph */
1241  prev_glyph = glyph;
1242  dummy.code = code;
1243  glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1244 
1245  /* kerning */
1246  if (s->use_kerning && prev_glyph && glyph->code) {
1247  FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1248  ft_kerning_default, &delta);
1249  x += delta.x >> 6;
1250  }
1251 
1252  /* save position */
1253  s->positions[i].x = x + glyph->bitmap_left;
1254  s->positions[i].y = y - glyph->bitmap_top + y_max;
1255  if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1256  else x += glyph->advance;
1257  }
1258 
1259  max_text_line_w = FFMAX(x, max_text_line_w);
1260 
1261  s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1262  s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1263 
1264  s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1265  s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1266  s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1267  s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1268 
1269  s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1270 
1271  s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1272  s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1273  s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1274 #if FF_API_DRAWTEXT_OLD_TIMELINE
1275  if (s->draw_pexpr){
1276  s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);
1277 
1278  if(!s->draw)
1279  return 0;
1280  }
1281  if (ctx->is_disabled)
1282  return 0;
1283 #endif
1284 
1285  box_w = FFMIN(width - 1 , max_text_line_w);
1286  box_h = FFMIN(height - 1, y + s->max_glyph_h);
1287 
1288  /* draw box */
1289  if (s->draw_box)
1290  ff_blend_rectangle(&s->dc, &s->boxcolor,
1291  frame->data, frame->linesize, width, height,
1292  s->x, s->y, box_w, box_h);
1293 
1294  if (s->shadowx || s->shadowy) {
1295  if ((ret = draw_glyphs(s, frame, width, height,
1296  &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1297  return ret;
1298  }
1299 
1300  if (s->borderw) {
1301  if ((ret = draw_glyphs(s, frame, width, height,
1302  &s->bordercolor, 0, 0, s->borderw)) < 0)
1303  return ret;
1304  }
1305  if ((ret = draw_glyphs(s, frame, width, height,
1306  &s->fontcolor, 0, 0, 0)) < 0)
1307  return ret;
1308 
1309  return 0;
1310 }
1311 
1312 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
1313 {
1314  AVFilterContext *ctx = inlink->dst;
1315  AVFilterLink *outlink = ctx->outputs[0];
1316  DrawTextContext *s = ctx->priv;
1317  int ret;
1318 
1319  if (s->reload) {
1320  if ((ret = load_textfile(ctx)) < 0)
1321  return ret;
1322 #if CONFIG_LIBFRIBIDI
1323  if (s->text_shaping)
1324  if ((ret = shape_text(ctx)) < 0)
1325  return ret;
1326 #endif
1327  }
1328 
1329  s->var_values[VAR_N] = inlink->frame_count+s->start_number;
1330  s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1331  NAN : frame->pts * av_q2d(inlink->time_base);
1332 
1333  s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1334  s->metadata = av_frame_get_metadata(frame);
1335 
1336  draw_text(ctx, frame, frame->width, frame->height);
1337 
1338  av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1339  (int)s->var_values[VAR_N], s->var_values[VAR_T],
1340  (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1341  s->x, s->y);
1342 
1343  return ff_filter_frame(outlink, frame);
1344 }
1345 
1346 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1347  {
1348  .name = "default",
1349  .type = AVMEDIA_TYPE_VIDEO,
1350  .filter_frame = filter_frame,
1351  .config_props = config_input,
1352  .needs_writable = 1,
1353  },
1354  { NULL }
1355 };
1356 
1357 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1358  {
1359  .name = "default",
1360  .type = AVMEDIA_TYPE_VIDEO,
1361  },
1362  { NULL }
1363 };
1364 
1365 AVFilter ff_vf_drawtext = {
1366  .name = "drawtext",
1367  .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1368  .priv_size = sizeof(DrawTextContext),
1369  .priv_class = &drawtext_class,
1370  .init = init,
1371  .uninit = uninit,
1372  .query_formats = query_formats,
1373  .inputs = avfilter_vf_drawtext_inputs,
1374  .outputs = avfilter_vf_drawtext_outputs,
1375  .process_command = command,
1376 #if FF_API_DRAWTEXT_OLD_TIMELINE
1377  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
1378 #else
1379  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
1380 #endif
1381 };
Generated on Sun Sep 14 2014 18:56:10 for FFmpeg by   doxygen 1.8.2