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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavfilter / vf_drawtext.c
CommitLineData
2ba45a60
DM		 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
72static 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
93static const char *const fun2_names[] = {
94 "rand"
95};
96
97static double drand(void *opaque, double min, double max)
98{
99 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
100}
101
102typedef double (*eval_func2)(void *, double a, double b);
103
104static const eval_func2 fun2[] = {
105 drand,
106 NULL
107};
108
109enum 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
130enum expansion_mode {
131 EXP_NONE,
132 EXP_NORMAL,
133 EXP_STRFTIME,
134};
135
136typedef 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
201static 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
264AVFILTER_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
271static 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
280typedef 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
292static 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 */
302static 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
360error:
361 if (glyph)
362 av_freep(&glyph->glyph);
363
364 av_freep(&glyph);
365 av_freep(&node);
366 return ret;
367}
368
369static 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
384static 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);
450fail:
451 FcPatternDestroy(best);
452 return err;
453}
454#endif
455
456static 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
473static 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
500static inline int is_newline(uint32_t c)
501{
502 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
503}
504
505#if CONFIG_LIBFRIBIDI
506static 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
584out:
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
593static 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
694static int query_formats(AVFilterContext *ctx)
695{
696 ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
697 return 0;
698}
699
700static 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
710static 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#else
720 s->x_pexpr = s->y_pexpr = NULL;
721#endif
722 av_freep(&s->positions);
723 s->nb_positions = 0;
724
725
726 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
727 av_tree_destroy(s->glyphs);
728 s->glyphs = NULL;
729
730 FT_Done_Face(s->face);
731 FT_Stroker_Done(s->stroker);
732 FT_Done_FreeType(s->library);
733
734 av_bprint_finalize(&s->expanded_text, NULL);
735 av_bprint_finalize(&s->expanded_fontcolor, NULL);
736}
737
738static int config_input(AVFilterLink *inlink)
739{
740 AVFilterContext *ctx = inlink->dst;
741 DrawTextContext *s = ctx->priv;
742 int ret;
743
744 ff_draw_init(&s->dc, inlink->format, 0);
745 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
746 ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
747 ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
748 ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
749
750 s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
751 s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
752 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
753 s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
754 s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
755 s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
756 s->var_values[VAR_X] = NAN;
757 s->var_values[VAR_Y] = NAN;
758 s->var_values[VAR_T] = NAN;
759
760 av_lfg_init(&s->prng, av_get_random_seed());
761
762 av_expr_free(s->x_pexpr);
763 av_expr_free(s->y_pexpr);
764#if FF_API_DRAWTEXT_OLD_TIMELINE
765 av_expr_free(s->draw_pexpr);
766 s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
767#else
768 s->x_pexpr = s->y_pexpr = NULL;
769#endif
770
771 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
772 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
773 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
774 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
775
776 return AVERROR(EINVAL);
777#if FF_API_DRAWTEXT_OLD_TIMELINE
778 if (s->draw_expr &&
779 (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,
780 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
781 return ret;
782#endif
783
784 return 0;
785}
786
787static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
788{
789 DrawTextContext *s = ctx->priv;
790
791 if (!strcmp(cmd, "reinit")) {
792 int ret;
793 uninit(ctx);
794 s->reinit = 1;
795 if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
796 return ret;
797 if ((ret = init(ctx)) < 0)
798 return ret;
799 return config_input(ctx->inputs[0]);
800 }
801
802 return AVERROR(ENOSYS);
803}
804
805static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
806 char *fct, unsigned argc, char **argv, int tag)
807{
808 DrawTextContext *s = ctx->priv;
809
810 av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
811 return 0;
812}
813
814static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
815 char *fct, unsigned argc, char **argv, int tag)
816{
817 DrawTextContext *s = ctx->priv;
818 const char *fmt;
819 double pts = s->var_values[VAR_T];
820 int ret;
821
822 fmt = argc >= 1 ? argv[0] : "flt";
823 if (argc >= 2) {
824 int64_t delta;
825 if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
826 av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
827 return ret;
828 }
829 pts += (double)delta / AV_TIME_BASE;
830 }
831 if (!strcmp(fmt, "flt")) {
832 av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
833 } else if (!strcmp(fmt, "hms")) {
834 if (isnan(pts)) {
835 av_bprintf(bp, " ??:??:??.???");
836 } else {
837 int64_t ms = round(pts * 1000);
838 char sign = ' ';
839 if (ms < 0) {
840 sign = '-';
841 ms = -ms;
842 }
843 av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
844 (int)(ms / (60 * 60 * 1000)),
845 (int)(ms / (60 * 1000)) % 60,
846 (int)(ms / 1000) % 60,
847 (int)ms % 1000);
848 }
849 } else {
850 av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
851 return AVERROR(EINVAL);
852 }
853 return 0;
854}
855
856static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
857 char *fct, unsigned argc, char **argv, int tag)
858{
859 DrawTextContext *s = ctx->priv;
860
861 av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
862 return 0;
863}
864
865static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
866 char *fct, unsigned argc, char **argv, int tag)
867{
868 DrawTextContext *s = ctx->priv;
869 AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
870
871 if (e && e->value)
872 av_bprintf(bp, "%s", e->value);
873 return 0;
874}
875
876#if !HAVE_LOCALTIME_R
877static void localtime_r(const time_t *t, struct tm *tm)
878{
879 *tm = *localtime(t);
880}
881#endif
882
883static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
884 char *fct, unsigned argc, char **argv, int tag)
885{
886 const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
887 time_t now;
888 struct tm tm;
889
890 time(&now);
891 if (tag == 'L')
892 localtime_r(&now, &tm);
893 else
894 tm = *gmtime(&now);
895 av_bprint_strftime(bp, fmt, &tm);
896 return 0;
897}
898
899static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
900 char *fct, unsigned argc, char **argv, int tag)
901{
902 DrawTextContext *s = ctx->priv;
903 double res;
904 int ret;
905
906 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
907 NULL, NULL, fun2_names, fun2,
908 &s->prng, 0, ctx);
909 if (ret < 0)
910 av_log(ctx, AV_LOG_ERROR,
911 "Expression '%s' for the expr text expansion function is not valid\n",
912 argv[0]);
913 else
914 av_bprintf(bp, "%f", res);
915
916 return ret;
917}
918
919static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,
920 char *fct, unsigned argc, char **argv, int tag)
921{
922 DrawTextContext *s = ctx->priv;
923 double res;
924 int intval;
925 int ret;
926 unsigned int positions = 0;
927 char fmt_str[30] = "%";
928
929 /*
930 * argv[0] expression to be converted to `int`
931 * argv[1] format: 'x', 'X', 'd' or 'u'
932 * argv[2] positions printed (optional)
933 */
934
935 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
936 NULL, NULL, fun2_names, fun2,
937 &s->prng, 0, ctx);
938 if (ret < 0) {
939 av_log(ctx, AV_LOG_ERROR,
940 "Expression '%s' for the expr text expansion function is not valid\n",
941 argv[0]);
942 return ret;
943 }
944
945 if (!strchr("xXdu", argv[1][0])) {
946 av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
947 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
948 return AVERROR(EINVAL);
949 }
950
951 if (argc == 3) {
952 ret = sscanf(argv[2], "%u", &positions);
953 if (ret != 1) {
954 av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
955 " to print: '%s'\n", argv[2]);
956 return AVERROR(EINVAL);
957 }
958 }
959
960 feclearexcept(FE_ALL_EXCEPT);
961 intval = res;
962 if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
963 av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
964 return AVERROR(EINVAL);
965 }
966
967 if (argc == 3)
968 av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
969 av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
970
971 av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
972 res, argv[0], fmt_str);
973
974 av_bprintf(bp, fmt_str, intval);
975
976 return 0;
977}
978
979static const struct drawtext_function {
980 const char *name;
981 unsigned argc_min, argc_max;
982 int tag; /**< opaque argument to func */
983 int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
984} functions[] = {
985 { "expr", 1, 1, 0, func_eval_expr },
986 { "e", 1, 1, 0, func_eval_expr },
987 { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
988 { "eif", 2, 3, 0, func_eval_expr_int_format },
989 { "pict_type", 0, 0, 0, func_pict_type },
990 { "pts", 0, 2, 0, func_pts },
991 { "gmtime", 0, 1, 'G', func_strftime },
992 { "localtime", 0, 1, 'L', func_strftime },
993 { "frame_num", 0, 0, 0, func_frame_num },
994 { "n", 0, 0, 0, func_frame_num },
995 { "metadata", 1, 1, 0, func_metadata },
996};
997
998static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
999 unsigned argc, char **argv)
1000{
1001 unsigned i;
1002
1003 for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
1004 if (strcmp(fct, functions[i].name))
1005 continue;
1006 if (argc < functions[i].argc_min) {
1007 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
1008 fct, functions[i].argc_min);
1009 return AVERROR(EINVAL);
1010 }
1011 if (argc > functions[i].argc_max) {
1012 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
1013 fct, functions[i].argc_max);
1014 return AVERROR(EINVAL);
1015 }
1016 break;
1017 }
1018 if (i >= FF_ARRAY_ELEMS(functions)) {
1019 av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
1020 return AVERROR(EINVAL);
1021 }
1022 return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
1023}
1024
1025static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
1026{
1027 const char *text = *rtext;
1028 char *argv[16] = { NULL };
1029 unsigned argc = 0, i;
1030 int ret;
1031
1032 if (*text != '{') {
1033 av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
1034 return AVERROR(EINVAL);
1035 }
1036 text++;
1037 while (1) {
1038 if (!(argv[argc++] = av_get_token(&text, ":}"))) {
1039 ret = AVERROR(ENOMEM);
1040 goto end;
1041 }
1042 if (!*text) {
1043 av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
1044 ret = AVERROR(EINVAL);
1045 goto end;
1046 }
1047 if (argc == FF_ARRAY_ELEMS(argv))
1048 av_freep(&argv[--argc]); /* error will be caught later */
1049 if (*text == '}')
1050 break;
1051 text++;
1052 }
1053
1054 if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
1055 goto end;
1056 ret = 0;
1057 *rtext = (char *)text + 1;
1058
1059end:
1060 for (i = 0; i < argc; i++)
1061 av_freep(&argv[i]);
1062 return ret;
1063}
1064
1065static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
1066{
1067 int ret;
1068
1069 av_bprint_clear(bp);
1070 while (*text) {
1071 if (*text == '\\' && text[1]) {
1072 av_bprint_chars(bp, text[1], 1);
1073 text += 2;
1074 } else if (*text == '%') {
1075 text++;
1076 if ((ret = expand_function(ctx, bp, &text)) < 0)
1077 return ret;
1078 } else {
1079 av_bprint_chars(bp, *text, 1);
1080 text++;
1081 }
1082 }
1083 if (!av_bprint_is_complete(bp))
1084 return AVERROR(ENOMEM);
1085 return 0;
1086}
1087
1088static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
1089 int width, int height,
1090 FFDrawColor *color, int x, int y, int borderw)
1091{
1092 char *text = s->expanded_text.str;
1093 uint32_t code = 0;
1094 int i, x1, y1;
1095 uint8_t *p;
1096 Glyph *glyph = NULL;
1097
1098 for (i = 0, p = text; *p; i++) {
1099 FT_Bitmap bitmap;
1100 Glyph dummy = { 0 };
1101 GET_UTF8(code, *p++, continue;);
1102
1103 /* skip new line chars, just go to new line */
1104 if (code == '\n' || code == '\r' || code == '\t')
1105 continue;
1106
1107 dummy.code = code;
1108 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
1109
1110 bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
1111
1112 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
1113 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
1114 return AVERROR(EINVAL);
1115
1116 x1 = s->positions[i].x+s->x+x - borderw;
1117 y1 = s->positions[i].y+s->y+y - borderw;
1118
1119 ff_blend_mask(&s->dc, color,
1120 frame->data, frame->linesize, width, height,
1121 bitmap.buffer, bitmap.pitch,
1122 bitmap.width, bitmap.rows,
1123 bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
1124 0, x1, y1);
1125 }
1126
1127 return 0;
1128}
1129
1130static int draw_text(AVFilterContext *ctx, AVFrame *frame,
1131 int width, int height)
1132{
1133 DrawTextContext *s = ctx->priv;
1134 AVFilterLink *inlink = ctx->inputs[0];
1135
1136 uint32_t code = 0, prev_code = 0;
1137 int x = 0, y = 0, i = 0, ret;
1138 int max_text_line_w = 0, len;
1139 int box_w, box_h;
1140 char *text;
1141 uint8_t *p;
1142 int y_min = 32000, y_max = -32000;
1143 int x_min = 32000, x_max = -32000;
1144 FT_Vector delta;
1145 Glyph *glyph = NULL, *prev_glyph = NULL;
1146 Glyph dummy = { 0 };
1147
1148 time_t now = time(0);
1149 struct tm ltime;
1150 AVBPrint *bp = &s->expanded_text;
1151
1152 av_bprint_clear(bp);
1153
1154 if(s->basetime != AV_NOPTS_VALUE)
1155 now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
1156
1157 switch (s->exp_mode) {
1158 case EXP_NONE:
1159 av_bprintf(bp, "%s", s->text);
1160 break;
1161 case EXP_NORMAL:
1162 if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
1163 return ret;
1164 break;
1165 case EXP_STRFTIME:
1166 localtime_r(&now, &ltime);
1167 av_bprint_strftime(bp, s->text, &ltime);
1168 break;
1169 }
1170
1171 if (s->tc_opt_string) {
1172 char tcbuf[AV_TIMECODE_STR_SIZE];
1173 av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
1174 av_bprint_clear(bp);
1175 av_bprintf(bp, "%s%s", s->text, tcbuf);
1176 }
1177
1178 if (!av_bprint_is_complete(bp))
1179 return AVERROR(ENOMEM);
1180 text = s->expanded_text.str;
1181 if ((len = s->expanded_text.len) > s->nb_positions) {
1182 if (!(s->positions =
1183 av_realloc(s->positions, len*sizeof(*s->positions))))
1184 return AVERROR(ENOMEM);
1185 s->nb_positions = len;
1186 }
1187
1188 if (s->fontcolor_expr[0]) {
1189 /* If expression is set, evaluate and replace the static value */
1190 av_bprint_clear(&s->expanded_fontcolor);
1191 if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
1192 return ret;
1193 if (!av_bprint_is_complete(&s->expanded_fontcolor))
1194 return AVERROR(ENOMEM);
1195 av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);
1196 ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);
1197 if (ret)
1198 return ret;
1199 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
1200 }
1201
1202 x = 0;
1203 y = 0;
1204
1205 /* load and cache glyphs */
1206 for (i = 0, p = text; *p; i++) {
1207 GET_UTF8(code, *p++, continue;);
1208
1209 /* get glyph */
1210 dummy.code = code;
1211 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1212 if (!glyph) {
1213 load_glyph(ctx, &glyph, code);
1214 }
1215
1216 y_min = FFMIN(glyph->bbox.yMin, y_min);
1217 y_max = FFMAX(glyph->bbox.yMax, y_max);
1218 x_min = FFMIN(glyph->bbox.xMin, x_min);
1219 x_max = FFMAX(glyph->bbox.xMax, x_max);
1220 }
1221 s->max_glyph_h = y_max - y_min;
1222 s->max_glyph_w = x_max - x_min;
1223
1224 /* compute and save position for each glyph */
1225 glyph = NULL;
1226 for (i = 0, p = text; *p; i++) {
1227 GET_UTF8(code, *p++, continue;);
1228
1229 /* skip the \n in the sequence \r\n */
1230 if (prev_code == '\r' && code == '\n')
1231 continue;
1232
1233 prev_code = code;
1234 if (is_newline(code)) {
1235
1236 max_text_line_w = FFMAX(max_text_line_w, x);
1237 y += s->max_glyph_h;
1238 x = 0;
1239 continue;
1240 }
1241
1242 /* get glyph */
1243 prev_glyph = glyph;
1244 dummy.code = code;
1245 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1246
1247 /* kerning */
1248 if (s->use_kerning && prev_glyph && glyph->code) {
1249 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1250 ft_kerning_default, &delta);
1251 x += delta.x >> 6;
1252 }
1253
1254 /* save position */
1255 s->positions[i].x = x + glyph->bitmap_left;
1256 s->positions[i].y = y - glyph->bitmap_top + y_max;
1257 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1258 else x += glyph->advance;
1259 }
1260
1261 max_text_line_w = FFMAX(x, max_text_line_w);
1262
1263 s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1264 s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1265
1266 s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1267 s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1268 s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1269 s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1270
1271 s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1272
1273 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1274 s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1275 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1276#if FF_API_DRAWTEXT_OLD_TIMELINE
1277 if (s->draw_pexpr){
1278 s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);
1279
1280 if(!s->draw)
1281 return 0;
1282 }
1283 if (ctx->is_disabled)
1284 return 0;
1285#endif
1286
1287 box_w = FFMIN(width - 1 , max_text_line_w);
1288 box_h = FFMIN(height - 1, y + s->max_glyph_h);
1289
1290 /* draw box */
1291 if (s->draw_box)
1292 ff_blend_rectangle(&s->dc, &s->boxcolor,
1293 frame->data, frame->linesize, width, height,
1294 s->x, s->y, box_w, box_h);
1295
1296 if (s->shadowx || s->shadowy) {
1297 if ((ret = draw_glyphs(s, frame, width, height,
1298 &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1299 return ret;
1300 }
1301
1302 if (s->borderw) {
1303 if ((ret = draw_glyphs(s, frame, width, height,
1304 &s->bordercolor, 0, 0, s->borderw)) < 0)
1305 return ret;
1306 }
1307 if ((ret = draw_glyphs(s, frame, width, height,
1308 &s->fontcolor, 0, 0, 0)) < 0)
1309 return ret;
1310
1311 return 0;
1312}
1313
1314static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
1315{
1316 AVFilterContext *ctx = inlink->dst;
1317 AVFilterLink *outlink = ctx->outputs[0];
1318 DrawTextContext *s = ctx->priv;
1319 int ret;
1320
1321 if (s->reload) {
1322 if ((ret = load_textfile(ctx)) < 0)
1323 return ret;
1324#if CONFIG_LIBFRIBIDI
1325 if (s->text_shaping)
1326 if ((ret = shape_text(ctx)) < 0)
1327 return ret;
1328#endif
1329 }
1330
1331 s->var_values[VAR_N] = inlink->frame_count+s->start_number;
1332 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1333 NAN : frame->pts * av_q2d(inlink->time_base);
1334
1335 s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1336 s->metadata = av_frame_get_metadata(frame);
1337
1338 draw_text(ctx, frame, frame->width, frame->height);
1339
1340 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1341 (int)s->var_values[VAR_N], s->var_values[VAR_T],
1342 (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1343 s->x, s->y);
1344
1345 return ff_filter_frame(outlink, frame);
1346}
1347
1348static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1349 {
1350 .name = "default",
1351 .type = AVMEDIA_TYPE_VIDEO,
1352 .filter_frame = filter_frame,
1353 .config_props = config_input,
1354 .needs_writable = 1,
1355 },
1356 { NULL }
1357};
1358
1359static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1360 {
1361 .name = "default",
1362 .type = AVMEDIA_TYPE_VIDEO,
1363 },
1364 { NULL }
1365};
1366
1367AVFilter ff_vf_drawtext = {
1368 .name = "drawtext",
1369 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1370 .priv_size = sizeof(DrawTextContext),
1371 .priv_class = &drawtext_class,
1372 .init = init,
1373 .uninit = uninit,
1374 .query_formats = query_formats,
1375 .inputs = avfilter_vf_drawtext_inputs,
1376 .outputs = avfilter_vf_drawtext_outputs,
1377 .process_command = command,
1378#if FF_API_DRAWTEXT_OLD_TIMELINE
1379 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
1380#else
1381 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
1382#endif
1383};
ffmpeg Piment Noir Debian package repository