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Imported Debian version 2.5.0~trusty1.1
[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"
f6fa7814 55#include "libavutil/time_internal.h"
2ba45a60
DM		 56#include "libavutil/tree.h"
57#include "libavutil/lfg.h"
58#include "avfilter.h"
59#include "drawutils.h"
60#include "formats.h"
61#include "internal.h"
62#include "video.h"
63
64#if CONFIG_LIBFRIBIDI
65#include <fribidi.h>
66#endif
67
68#include <ft2build.h>
69#include FT_FREETYPE_H
70#include FT_GLYPH_H
71#include FT_STROKER_H
72
73static const char *const var_names[] = {
74 "dar",
75 "hsub", "vsub",
76 "line_h", "lh", ///< line height, same as max_glyph_h
77 "main_h", "h", "H", ///< height of the input video
78 "main_w", "w", "W", ///< width of the input video
79 "max_glyph_a", "ascent", ///< max glyph ascent
80 "max_glyph_d", "descent", ///< min glyph descent
81 "max_glyph_h", ///< max glyph height
82 "max_glyph_w", ///< max glyph width
83 "n", ///< number of frame
84 "sar",
85 "t", ///< timestamp expressed in seconds
86 "text_h", "th", ///< height of the rendered text
87 "text_w", "tw", ///< width of the rendered text
88 "x",
89 "y",
90 "pict_type",
91 NULL
92};
93
94static const char *const fun2_names[] = {
95 "rand"
96};
97
98static double drand(void *opaque, double min, double max)
99{
100 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
101}
102
103typedef double (*eval_func2)(void *, double a, double b);
104
105static const eval_func2 fun2[] = {
106 drand,
107 NULL
108};
109
110enum var_name {
111 VAR_DAR,
112 VAR_HSUB, VAR_VSUB,
113 VAR_LINE_H, VAR_LH,
114 VAR_MAIN_H, VAR_h, VAR_H,
115 VAR_MAIN_W, VAR_w, VAR_W,
116 VAR_MAX_GLYPH_A, VAR_ASCENT,
117 VAR_MAX_GLYPH_D, VAR_DESCENT,
118 VAR_MAX_GLYPH_H,
119 VAR_MAX_GLYPH_W,
120 VAR_N,
121 VAR_SAR,
122 VAR_T,
123 VAR_TEXT_H, VAR_TH,
124 VAR_TEXT_W, VAR_TW,
125 VAR_X,
126 VAR_Y,
127 VAR_PICT_TYPE,
128 VAR_VARS_NB
129};
130
131enum expansion_mode {
132 EXP_NONE,
133 EXP_NORMAL,
134 EXP_STRFTIME,
135};
136
137typedef struct DrawTextContext {
138 const AVClass *class;
139 enum expansion_mode exp_mode; ///< expansion mode to use for the text
140 int reinit; ///< tells if the filter is being reinited
141#if CONFIG_LIBFONTCONFIG
142 uint8_t *font; ///< font to be used
143#endif
144 uint8_t *fontfile; ///< font to be used
145 uint8_t *text; ///< text to be drawn
146 AVBPrint expanded_text; ///< used to contain the expanded text
147 uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate
148 AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec
149 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
150 FT_Vector *positions; ///< positions for each element in the text
151 size_t nb_positions; ///< number of elements of positions array
152 char *textfile; ///< file with text to be drawn
153 int x; ///< x position to start drawing text
154 int y; ///< y position to start drawing text
155 int max_glyph_w; ///< max glyph width
156 int max_glyph_h; ///< max glyph height
157 int shadowx, shadowy;
158 int borderw; ///< border width
159 unsigned int fontsize; ///< font size to use
160
161 short int draw_box; ///< draw box around text - true or false
162 int use_kerning; ///< font kerning is used - true/false
163 int tabsize; ///< tab size
164 int fix_bounds; ///< do we let it go out of frame bounds - t/f
165
166 FFDrawContext dc;
167 FFDrawColor fontcolor; ///< foreground color
168 FFDrawColor shadowcolor; ///< shadow color
169 FFDrawColor bordercolor; ///< border color
170 FFDrawColor boxcolor; ///< background color
171
172 FT_Library library; ///< freetype font library handle
173 FT_Face face; ///< freetype font face handle
174 FT_Stroker stroker; ///< freetype stroker handle
175 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
176 char *x_expr; ///< expression for x position
177 char *y_expr; ///< expression for y position
178 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
179 int64_t basetime; ///< base pts time in the real world for display
180 double var_values[VAR_VARS_NB];
2ba45a60
DM		 181 AVLFG prng; ///< random
182 char *tc_opt_string; ///< specified timecode option string
183 AVRational tc_rate; ///< frame rate for timecode
184 AVTimecode tc; ///< timecode context
185 int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
186 int reload; ///< reload text file for each frame
187 int start_number; ///< starting frame number for n/frame_num var
188#if CONFIG_LIBFRIBIDI
189 int text_shaping; ///< 1 to shape the text before drawing it
190#endif
191 AVDictionary *metadata;
192} DrawTextContext;
193
194#define OFFSET(x) offsetof(DrawTextContext, x)
195#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
196
197static const AVOption drawtext_options[]= {
198 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
199 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
200 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
201 {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
202 {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS},
203 {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
204 {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
205 {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
206 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
207 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
208 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
209 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
210 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
211 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
212 {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
213 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
214 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
2ba45a60
DM		 215#if CONFIG_LIBFONTCONFIG
216 { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
217#endif
218
219 {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
220 {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
221 {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
222 {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
223
224 {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
225 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
226 {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
227 {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
228 {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
229 {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
230 {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
231 {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
232
233#if CONFIG_LIBFRIBIDI
234 {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
235#endif
236
237 /* FT_LOAD_* flags */
238 { "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" },
239 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
240 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
241 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
242 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
243 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
244 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
245 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
246 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
247 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
248 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
249 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
250 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
251 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
252 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
253 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
254 { NULL }
255};
256
257AVFILTER_DEFINE_CLASS(drawtext);
258
259#undef __FTERRORS_H__
260#define FT_ERROR_START_LIST {
261#define FT_ERRORDEF(e, v, s) { (e), (s) },
262#define FT_ERROR_END_LIST { 0, NULL } };
263
264static const struct ft_error
265{
266 int err;
267 const char *err_msg;
268} ft_errors[] =
269#include FT_ERRORS_H
270
271#define FT_ERRMSG(e) ft_errors[e].err_msg
272
273typedef struct Glyph {
274 FT_Glyph glyph;
275 FT_Glyph border_glyph;
276 uint32_t code;
277 FT_Bitmap bitmap; ///< array holding bitmaps of font
278 FT_Bitmap border_bitmap; ///< array holding bitmaps of font border
279 FT_BBox bbox;
280 int advance;
281 int bitmap_left;
282 int bitmap_top;
283} Glyph;
284
285static int glyph_cmp(void *key, const void *b)
286{
287 const Glyph *a = key, *bb = b;
288 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
289 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
290}
291
292/**
293 * Load glyphs corresponding to the UTF-32 codepoint code.
294 */
295static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
296{
297 DrawTextContext *s = ctx->priv;
298 FT_BitmapGlyph bitmapglyph;
299 Glyph *glyph;
300 struct AVTreeNode *node = NULL;
301 int ret;
302
303 /* load glyph into s->face->glyph */
304 if (FT_Load_Char(s->face, code, s->ft_load_flags))
305 return AVERROR(EINVAL);
306
307 glyph = av_mallocz(sizeof(*glyph));
308 if (!glyph) {
309 ret = AVERROR(ENOMEM);
310 goto error;
311 }
312 glyph->code = code;
313
314 if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {
315 ret = AVERROR(EINVAL);
316 goto error;
317 }
318 if (s->borderw) {
319 glyph->border_glyph = glyph->glyph;
320 if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||
321 FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
322 ret = AVERROR_EXTERNAL;
323 goto error;
324 }
325 bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;
326 glyph->border_bitmap = bitmapglyph->bitmap;
327 }
328 if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
329 ret = AVERROR_EXTERNAL;
330 goto error;
331 }
332 bitmapglyph = (FT_BitmapGlyph) glyph->glyph;
333
334 glyph->bitmap = bitmapglyph->bitmap;
335 glyph->bitmap_left = bitmapglyph->left;
336 glyph->bitmap_top = bitmapglyph->top;
337 glyph->advance = s->face->glyph->advance.x >> 6;
338
339 /* measure text height to calculate text_height (or the maximum text height) */
340 FT_Glyph_Get_CBox(glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
341
342 /* cache the newly created glyph */
343 if (!(node = av_tree_node_alloc())) {
344 ret = AVERROR(ENOMEM);
345 goto error;
346 }
347 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
348
349 if (glyph_ptr)
350 *glyph_ptr = glyph;
351 return 0;
352
353error:
354 if (glyph)
355 av_freep(&glyph->glyph);
356
357 av_freep(&glyph);
358 av_freep(&node);
359 return ret;
360}
361
362static int load_font_file(AVFilterContext *ctx, const char *path, int index)
363{
364 DrawTextContext *s = ctx->priv;
365 int err;
366
367 err = FT_New_Face(s->library, path, index, &s->face);
368 if (err) {
369 av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
370 s->fontfile, FT_ERRMSG(err));
371 return AVERROR(EINVAL);
372 }
373 return 0;
374}
375
376#if CONFIG_LIBFONTCONFIG
377static int load_font_fontconfig(AVFilterContext *ctx)
378{
379 DrawTextContext *s = ctx->priv;
380 FcConfig *fontconfig;
381 FcPattern *pat, *best;
382 FcResult result = FcResultMatch;
383 FcChar8 *filename;
384 int index;
385 double size;
386 int err = AVERROR(ENOENT);
387
388 fontconfig = FcInitLoadConfigAndFonts();
389 if (!fontconfig) {
390 av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
391 return AVERROR_UNKNOWN;
392 }
393 pat = FcNameParse(s->fontfile ? s->fontfile :
394 (uint8_t *)(intptr_t)"default");
395 if (!pat) {
396 av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
397 return AVERROR(EINVAL);
398 }
399
400 FcPatternAddString(pat, FC_FAMILY, s->font);
401 if (s->fontsize)
402 FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
403
404 FcDefaultSubstitute(pat);
405
406 if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
407 av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
408 FcPatternDestroy(pat);
409 return AVERROR(ENOMEM);
410 }
411
412 best = FcFontMatch(fontconfig, pat, &result);
413 FcPatternDestroy(pat);
414
415 if (!best || result != FcResultMatch) {
416 av_log(ctx, AV_LOG_ERROR,
417 "Cannot find a valid font for the family %s\n",
418 s->font);
419 goto fail;
420 }
421
422 if (
423 FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
424 FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
425 av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
426 return AVERROR(EINVAL);
427 }
428
429 if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
430 av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
431 s->font);
432 goto fail;
433 }
434
435 av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
436 if (!s->fontsize)
437 s->fontsize = size + 0.5;
438
439 err = load_font_file(ctx, filename, index);
440 if (err)
441 return err;
442 FcConfigDestroy(fontconfig);
443fail:
444 FcPatternDestroy(best);
445 return err;
446}
447#endif
448
449static int load_font(AVFilterContext *ctx)
450{
451 DrawTextContext *s = ctx->priv;
452 int err;
453
454 /* load the face, and set up the encoding, which is by default UTF-8 */
455 err = load_font_file(ctx, s->fontfile, 0);
456 if (!err)
457 return 0;
458#if CONFIG_LIBFONTCONFIG
459 err = load_font_fontconfig(ctx);
460 if (!err)
461 return 0;
462#endif
463 return err;
464}
465
466static int load_textfile(AVFilterContext *ctx)
467{
468 DrawTextContext *s = ctx->priv;
469 int err;
470 uint8_t *textbuf;
471 uint8_t *tmp;
472 size_t textbuf_size;
473
474 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
475 av_log(ctx, AV_LOG_ERROR,
476 "The text file '%s' could not be read or is empty\n",
477 s->textfile);
478 return err;
479 }
480
f6fa7814 481 if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) {
2ba45a60
DM		 482 av_file_unmap(textbuf, textbuf_size);
483 return AVERROR(ENOMEM);
484 }
485 s->text = tmp;
486 memcpy(s->text, textbuf, textbuf_size);
487 s->text[textbuf_size] = 0;
488 av_file_unmap(textbuf, textbuf_size);
489
490 return 0;
491}
492
493static inline int is_newline(uint32_t c)
494{
495 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
496}
497
498#if CONFIG_LIBFRIBIDI
499static int shape_text(AVFilterContext *ctx)
500{
501 DrawTextContext *s = ctx->priv;
502 uint8_t *tmp;
503 int ret = AVERROR(ENOMEM);
504 static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |
505 FRIBIDI_FLAGS_ARABIC;
506 FriBidiChar *unicodestr = NULL;
507 FriBidiStrIndex len;
508 FriBidiParType direction = FRIBIDI_PAR_LTR;
509 FriBidiStrIndex line_start = 0;
510 FriBidiStrIndex line_end = 0;
511 FriBidiLevel *embedding_levels = NULL;
512 FriBidiArabicProp *ar_props = NULL;
513 FriBidiCharType *bidi_types = NULL;
514 FriBidiStrIndex i,j;
515
516 len = strlen(s->text);
517 if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) {
518 goto out;
519 }
520 len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,
521 s->text, len, unicodestr);
522
523 bidi_types = av_malloc_array(len, sizeof(*bidi_types));
524 if (!bidi_types) {
525 goto out;
526 }
527
528 fribidi_get_bidi_types(unicodestr, len, bidi_types);
529
530 embedding_levels = av_malloc_array(len, sizeof(*embedding_levels));
531 if (!embedding_levels) {
532 goto out;
533 }
534
535 if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction,
536 embedding_levels)) {
537 goto out;
538 }
539
540 ar_props = av_malloc_array(len, sizeof(*ar_props));
541 if (!ar_props) {
542 goto out;
543 }
544
545 fribidi_get_joining_types(unicodestr, len, ar_props);
546 fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props);
547 fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr);
548
549 for (line_end = 0, line_start = 0; line_end < len; line_end++) {
550 if (is_newline(unicodestr[line_end]) || line_end == len - 1) {
551 if (!fribidi_reorder_line(flags, bidi_types,
552 line_end - line_start + 1, line_start,
553 direction, embedding_levels, unicodestr,
554 NULL)) {
555 goto out;
556 }
557 line_start = line_end + 1;
558 }
559 }
560
561 /* Remove zero-width fill chars put in by libfribidi */
562 for (i = 0, j = 0; i < len; i++)
563 if (unicodestr[i] != FRIBIDI_CHAR_FILL)
564 unicodestr[j++] = unicodestr[i];
565 len = j;
566
567 if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) {
568 /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */
569 goto out;
570 }
571
572 s->text = tmp;
573 len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,
574 unicodestr, len, s->text);
575 ret = 0;
576
577out:
578 av_free(unicodestr);
579 av_free(embedding_levels);
580 av_free(ar_props);
581 av_free(bidi_types);
582 return ret;
583}
584#endif
585
586static av_cold int init(AVFilterContext *ctx)
587{
588 int err;
589 DrawTextContext *s = ctx->priv;
590 Glyph *glyph;
591
2ba45a60
DM		 592 if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
593 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
594 return AVERROR(EINVAL);
595 }
596
597 if (s->textfile) {
598 if (s->text) {
599 av_log(ctx, AV_LOG_ERROR,
600 "Both text and text file provided. Please provide only one\n");
601 return AVERROR(EINVAL);
602 }
603 if ((err = load_textfile(ctx)) < 0)
604 return err;
605 }
606
607#if CONFIG_LIBFRIBIDI
608 if (s->text_shaping)
609 if ((err = shape_text(ctx)) < 0)
610 return err;
611#endif
612
613 if (s->reload && !s->textfile)
614 av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
615
616 if (s->tc_opt_string) {
617 int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
618 s->tc_opt_string, ctx);
619 if (ret < 0)
620 return ret;
621 if (s->tc24hmax)
622 s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
623 if (!s->text)
624 s->text = av_strdup("");
625 }
626
627 if (!s->text) {
628 av_log(ctx, AV_LOG_ERROR,
629 "Either text, a valid file or a timecode must be provided\n");
630 return AVERROR(EINVAL);
631 }
632
633 if ((err = FT_Init_FreeType(&(s->library)))) {
634 av_log(ctx, AV_LOG_ERROR,
635 "Could not load FreeType: %s\n", FT_ERRMSG(err));
636 return AVERROR(EINVAL);
637 }
638
639 err = load_font(ctx);
640 if (err)
641 return err;
642 if (!s->fontsize)
643 s->fontsize = 16;
644 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
645 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
646 s->fontsize, FT_ERRMSG(err));
647 return AVERROR(EINVAL);
648 }
649
650 if (s->borderw) {
651 if (FT_Stroker_New(s->library, &s->stroker)) {
652 av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");
653 return AVERROR_EXTERNAL;
654 }
655 FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
656 FT_STROKER_LINEJOIN_ROUND, 0);
657 }
658
659 s->use_kerning = FT_HAS_KERNING(s->face);
660
661 /* load the fallback glyph with code 0 */
662 load_glyph(ctx, NULL, 0);
663
664 /* set the tabsize in pixels */
665 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
666 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
667 return err;
668 }
669 s->tabsize *= glyph->advance;
670
671 if (s->exp_mode == EXP_STRFTIME &&
672 (strchr(s->text, '%') || strchr(s->text, '\\')))
673 av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
674
675 av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
676 av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED);
677
678 return 0;
679}
680
681static int query_formats(AVFilterContext *ctx)
682{
683 ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
684 return 0;
685}
686
687static int glyph_enu_free(void *opaque, void *elem)
688{
689 Glyph *glyph = elem;
690
691 FT_Done_Glyph(glyph->glyph);
692 FT_Done_Glyph(glyph->border_glyph);
693 av_free(elem);
694 return 0;
695}
696
697static av_cold void uninit(AVFilterContext *ctx)
698{
699 DrawTextContext *s = ctx->priv;
700
701 av_expr_free(s->x_pexpr);
702 av_expr_free(s->y_pexpr);
2ba45a60 703 s->x_pexpr = s->y_pexpr = NULL;
2ba45a60
DM		 704 av_freep(&s->positions);
705 s->nb_positions = 0;
706
707
708 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
709 av_tree_destroy(s->glyphs);
710 s->glyphs = NULL;
711
712 FT_Done_Face(s->face);
713 FT_Stroker_Done(s->stroker);
714 FT_Done_FreeType(s->library);
715
716 av_bprint_finalize(&s->expanded_text, NULL);
717 av_bprint_finalize(&s->expanded_fontcolor, NULL);
718}
719
720static int config_input(AVFilterLink *inlink)
721{
722 AVFilterContext *ctx = inlink->dst;
723 DrawTextContext *s = ctx->priv;
724 int ret;
725
726 ff_draw_init(&s->dc, inlink->format, 0);
727 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
728 ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
729 ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
730 ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
731
732 s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
733 s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
734 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
735 s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
736 s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
737 s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
738 s->var_values[VAR_X] = NAN;
739 s->var_values[VAR_Y] = NAN;
740 s->var_values[VAR_T] = NAN;
741
742 av_lfg_init(&s->prng, av_get_random_seed());
743
744 av_expr_free(s->x_pexpr);
745 av_expr_free(s->y_pexpr);
2ba45a60 746 s->x_pexpr = s->y_pexpr = NULL;
2ba45a60
DM		 747
748 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
749 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
750 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
751 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
752
753 return AVERROR(EINVAL);
2ba45a60
DM		 754
755 return 0;
756}
757
758static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
759{
760 DrawTextContext *s = ctx->priv;
761
762 if (!strcmp(cmd, "reinit")) {
763 int ret;
764 uninit(ctx);
765 s->reinit = 1;
766 if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
767 return ret;
768 if ((ret = init(ctx)) < 0)
769 return ret;
770 return config_input(ctx->inputs[0]);
771 }
772
773 return AVERROR(ENOSYS);
774}
775
776static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
777 char *fct, unsigned argc, char **argv, int tag)
778{
779 DrawTextContext *s = ctx->priv;
780
781 av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
782 return 0;
783}
784
785static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
786 char *fct, unsigned argc, char **argv, int tag)
787{
788 DrawTextContext *s = ctx->priv;
789 const char *fmt;
790 double pts = s->var_values[VAR_T];
791 int ret;
792
793 fmt = argc >= 1 ? argv[0] : "flt";
794 if (argc >= 2) {
795 int64_t delta;
796 if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
797 av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
798 return ret;
799 }
800 pts += (double)delta / AV_TIME_BASE;
801 }
802 if (!strcmp(fmt, "flt")) {
803 av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
804 } else if (!strcmp(fmt, "hms")) {
805 if (isnan(pts)) {
806 av_bprintf(bp, " ??:??:??.???");
807 } else {
808 int64_t ms = round(pts * 1000);
809 char sign = ' ';
810 if (ms < 0) {
811 sign = '-';
812 ms = -ms;
813 }
814 av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
815 (int)(ms / (60 * 60 * 1000)),
816 (int)(ms / (60 * 1000)) % 60,
817 (int)(ms / 1000) % 60,
818 (int)ms % 1000);
819 }
820 } else {
821 av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
822 return AVERROR(EINVAL);
823 }
824 return 0;
825}
826
827static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
828 char *fct, unsigned argc, char **argv, int tag)
829{
830 DrawTextContext *s = ctx->priv;
831
832 av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
833 return 0;
834}
835
836static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
837 char *fct, unsigned argc, char **argv, int tag)
838{
839 DrawTextContext *s = ctx->priv;
840 AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
841
842 if (e && e->value)
843 av_bprintf(bp, "%s", e->value);
844 return 0;
845}
846
2ba45a60
DM		 847static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
848 char *fct, unsigned argc, char **argv, int tag)
849{
850 const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
851 time_t now;
852 struct tm tm;
853
854 time(&now);
855 if (tag == 'L')
856 localtime_r(&now, &tm);
857 else
f6fa7814 858 tm = *gmtime_r(&now, &tm);
2ba45a60
DM		 859 av_bprint_strftime(bp, fmt, &tm);
860 return 0;
861}
862
863static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
864 char *fct, unsigned argc, char **argv, int tag)
865{
866 DrawTextContext *s = ctx->priv;
867 double res;
868 int ret;
869
870 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
871 NULL, NULL, fun2_names, fun2,
872 &s->prng, 0, ctx);
873 if (ret < 0)
874 av_log(ctx, AV_LOG_ERROR,
875 "Expression '%s' for the expr text expansion function is not valid\n",
876 argv[0]);
877 else
878 av_bprintf(bp, "%f", res);
879
880 return ret;
881}
882
883static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,
884 char *fct, unsigned argc, char **argv, int tag)
885{
886 DrawTextContext *s = ctx->priv;
887 double res;
888 int intval;
889 int ret;
890 unsigned int positions = 0;
891 char fmt_str[30] = "%";
892
893 /*
894 * argv[0] expression to be converted to `int`
895 * argv[1] format: 'x', 'X', 'd' or 'u'
896 * argv[2] positions printed (optional)
897 */
898
899 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
900 NULL, NULL, fun2_names, fun2,
901 &s->prng, 0, ctx);
902 if (ret < 0) {
903 av_log(ctx, AV_LOG_ERROR,
904 "Expression '%s' for the expr text expansion function is not valid\n",
905 argv[0]);
906 return ret;
907 }
908
909 if (!strchr("xXdu", argv[1][0])) {
910 av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
911 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
912 return AVERROR(EINVAL);
913 }
914
915 if (argc == 3) {
916 ret = sscanf(argv[2], "%u", &positions);
917 if (ret != 1) {
918 av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
919 " to print: '%s'\n", argv[2]);
920 return AVERROR(EINVAL);
921 }
922 }
923
924 feclearexcept(FE_ALL_EXCEPT);
925 intval = res;
926 if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
927 av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
928 return AVERROR(EINVAL);
929 }
930
931 if (argc == 3)
932 av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
933 av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
934
935 av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
936 res, argv[0], fmt_str);
937
938 av_bprintf(bp, fmt_str, intval);
939
940 return 0;
941}
942
943static const struct drawtext_function {
944 const char *name;
945 unsigned argc_min, argc_max;
946 int tag; /**< opaque argument to func */
947 int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
948} functions[] = {
949 { "expr", 1, 1, 0, func_eval_expr },
950 { "e", 1, 1, 0, func_eval_expr },
951 { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
952 { "eif", 2, 3, 0, func_eval_expr_int_format },
953 { "pict_type", 0, 0, 0, func_pict_type },
954 { "pts", 0, 2, 0, func_pts },
955 { "gmtime", 0, 1, 'G', func_strftime },
956 { "localtime", 0, 1, 'L', func_strftime },
957 { "frame_num", 0, 0, 0, func_frame_num },
958 { "n", 0, 0, 0, func_frame_num },
959 { "metadata", 1, 1, 0, func_metadata },
960};
961
962static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
963 unsigned argc, char **argv)
964{
965 unsigned i;
966
967 for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
968 if (strcmp(fct, functions[i].name))
969 continue;
970 if (argc < functions[i].argc_min) {
971 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
972 fct, functions[i].argc_min);
973 return AVERROR(EINVAL);
974 }
975 if (argc > functions[i].argc_max) {
976 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
977 fct, functions[i].argc_max);
978 return AVERROR(EINVAL);
979 }
980 break;
981 }
982 if (i >= FF_ARRAY_ELEMS(functions)) {
983 av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
984 return AVERROR(EINVAL);
985 }
986 return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
987}
988
989static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
990{
991 const char *text = *rtext;
992 char *argv[16] = { NULL };
993 unsigned argc = 0, i;
994 int ret;
995
996 if (*text != '{') {
997 av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
998 return AVERROR(EINVAL);
999 }
1000 text++;
1001 while (1) {
1002 if (!(argv[argc++] = av_get_token(&text, ":}"))) {
1003 ret = AVERROR(ENOMEM);
1004 goto end;
1005 }
1006 if (!*text) {
1007 av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
1008 ret = AVERROR(EINVAL);
1009 goto end;
1010 }
1011 if (argc == FF_ARRAY_ELEMS(argv))
1012 av_freep(&argv[--argc]); /* error will be caught later */
1013 if (*text == '}')
1014 break;
1015 text++;
1016 }
1017
1018 if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
1019 goto end;
1020 ret = 0;
1021 *rtext = (char *)text + 1;
1022
1023end:
1024 for (i = 0; i < argc; i++)
1025 av_freep(&argv[i]);
1026 return ret;
1027}
1028
1029static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
1030{
1031 int ret;
1032
1033 av_bprint_clear(bp);
1034 while (*text) {
1035 if (*text == '\\' && text[1]) {
1036 av_bprint_chars(bp, text[1], 1);
1037 text += 2;
1038 } else if (*text == '%') {
1039 text++;
1040 if ((ret = expand_function(ctx, bp, &text)) < 0)
1041 return ret;
1042 } else {
1043 av_bprint_chars(bp, *text, 1);
1044 text++;
1045 }
1046 }
1047 if (!av_bprint_is_complete(bp))
1048 return AVERROR(ENOMEM);
1049 return 0;
1050}
1051
1052static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
1053 int width, int height,
1054 FFDrawColor *color, int x, int y, int borderw)
1055{
1056 char *text = s->expanded_text.str;
1057 uint32_t code = 0;
1058 int i, x1, y1;
1059 uint8_t *p;
1060 Glyph *glyph = NULL;
1061
1062 for (i = 0, p = text; *p; i++) {
1063 FT_Bitmap bitmap;
1064 Glyph dummy = { 0 };
1065 GET_UTF8(code, *p++, continue;);
1066
1067 /* skip new line chars, just go to new line */
1068 if (code == '\n' || code == '\r' || code == '\t')
1069 continue;
1070
1071 dummy.code = code;
1072 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
1073
1074 bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
1075
1076 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
1077 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
1078 return AVERROR(EINVAL);
1079
1080 x1 = s->positions[i].x+s->x+x - borderw;
1081 y1 = s->positions[i].y+s->y+y - borderw;
1082
1083 ff_blend_mask(&s->dc, color,
1084 frame->data, frame->linesize, width, height,
1085 bitmap.buffer, bitmap.pitch,
1086 bitmap.width, bitmap.rows,
1087 bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
1088 0, x1, y1);
1089 }
1090
1091 return 0;
1092}
1093
1094static int draw_text(AVFilterContext *ctx, AVFrame *frame,
1095 int width, int height)
1096{
1097 DrawTextContext *s = ctx->priv;
1098 AVFilterLink *inlink = ctx->inputs[0];
1099
1100 uint32_t code = 0, prev_code = 0;
1101 int x = 0, y = 0, i = 0, ret;
1102 int max_text_line_w = 0, len;
1103 int box_w, box_h;
1104 char *text;
1105 uint8_t *p;
1106 int y_min = 32000, y_max = -32000;
1107 int x_min = 32000, x_max = -32000;
1108 FT_Vector delta;
1109 Glyph *glyph = NULL, *prev_glyph = NULL;
1110 Glyph dummy = { 0 };
1111
1112 time_t now = time(0);
1113 struct tm ltime;
1114 AVBPrint *bp = &s->expanded_text;
1115
1116 av_bprint_clear(bp);
1117
1118 if(s->basetime != AV_NOPTS_VALUE)
1119 now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
1120
1121 switch (s->exp_mode) {
1122 case EXP_NONE:
1123 av_bprintf(bp, "%s", s->text);
1124 break;
1125 case EXP_NORMAL:
1126 if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
1127 return ret;
1128 break;
1129 case EXP_STRFTIME:
1130 localtime_r(&now, &ltime);
1131 av_bprint_strftime(bp, s->text, &ltime);
1132 break;
1133 }
1134
1135 if (s->tc_opt_string) {
1136 char tcbuf[AV_TIMECODE_STR_SIZE];
1137 av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
1138 av_bprint_clear(bp);
1139 av_bprintf(bp, "%s%s", s->text, tcbuf);
1140 }
1141
1142 if (!av_bprint_is_complete(bp))
1143 return AVERROR(ENOMEM);
1144 text = s->expanded_text.str;
1145 if ((len = s->expanded_text.len) > s->nb_positions) {
1146 if (!(s->positions =
1147 av_realloc(s->positions, len*sizeof(*s->positions))))
1148 return AVERROR(ENOMEM);
1149 s->nb_positions = len;
1150 }
1151
1152 if (s->fontcolor_expr[0]) {
1153 /* If expression is set, evaluate and replace the static value */
1154 av_bprint_clear(&s->expanded_fontcolor);
1155 if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
1156 return ret;
1157 if (!av_bprint_is_complete(&s->expanded_fontcolor))
1158 return AVERROR(ENOMEM);
1159 av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);
1160 ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);
1161 if (ret)
1162 return ret;
1163 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
1164 }
1165
1166 x = 0;
1167 y = 0;
1168
1169 /* load and cache glyphs */
1170 for (i = 0, p = text; *p; i++) {
1171 GET_UTF8(code, *p++, continue;);
1172
1173 /* get glyph */
1174 dummy.code = code;
1175 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1176 if (!glyph) {
1177 load_glyph(ctx, &glyph, code);
1178 }
1179
1180 y_min = FFMIN(glyph->bbox.yMin, y_min);
1181 y_max = FFMAX(glyph->bbox.yMax, y_max);
1182 x_min = FFMIN(glyph->bbox.xMin, x_min);
1183 x_max = FFMAX(glyph->bbox.xMax, x_max);
1184 }
1185 s->max_glyph_h = y_max - y_min;
1186 s->max_glyph_w = x_max - x_min;
1187
1188 /* compute and save position for each glyph */
1189 glyph = NULL;
1190 for (i = 0, p = text; *p; i++) {
1191 GET_UTF8(code, *p++, continue;);
1192
1193 /* skip the \n in the sequence \r\n */
1194 if (prev_code == '\r' && code == '\n')
1195 continue;
1196
1197 prev_code = code;
1198 if (is_newline(code)) {
1199
1200 max_text_line_w = FFMAX(max_text_line_w, x);
1201 y += s->max_glyph_h;
1202 x = 0;
1203 continue;
1204 }
1205
1206 /* get glyph */
1207 prev_glyph = glyph;
1208 dummy.code = code;
1209 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1210
1211 /* kerning */
1212 if (s->use_kerning && prev_glyph && glyph->code) {
1213 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1214 ft_kerning_default, &delta);
1215 x += delta.x >> 6;
1216 }
1217
1218 /* save position */
1219 s->positions[i].x = x + glyph->bitmap_left;
1220 s->positions[i].y = y - glyph->bitmap_top + y_max;
1221 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1222 else x += glyph->advance;
1223 }
1224
1225 max_text_line_w = FFMAX(x, max_text_line_w);
1226
1227 s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1228 s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1229
1230 s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1231 s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1232 s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1233 s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1234
1235 s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1236
1237 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1238 s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1239 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
2ba45a60
DM		 1240
1241 box_w = FFMIN(width - 1 , max_text_line_w);
1242 box_h = FFMIN(height - 1, y + s->max_glyph_h);
1243
1244 /* draw box */
1245 if (s->draw_box)
1246 ff_blend_rectangle(&s->dc, &s->boxcolor,
1247 frame->data, frame->linesize, width, height,
1248 s->x, s->y, box_w, box_h);
1249
1250 if (s->shadowx || s->shadowy) {
1251 if ((ret = draw_glyphs(s, frame, width, height,
1252 &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1253 return ret;
1254 }
1255
1256 if (s->borderw) {
1257 if ((ret = draw_glyphs(s, frame, width, height,
1258 &s->bordercolor, 0, 0, s->borderw)) < 0)
1259 return ret;
1260 }
1261 if ((ret = draw_glyphs(s, frame, width, height,
1262 &s->fontcolor, 0, 0, 0)) < 0)
1263 return ret;
1264
1265 return 0;
1266}
1267
1268static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
1269{
1270 AVFilterContext *ctx = inlink->dst;
1271 AVFilterLink *outlink = ctx->outputs[0];
1272 DrawTextContext *s = ctx->priv;
1273 int ret;
1274
1275 if (s->reload) {
1276 if ((ret = load_textfile(ctx)) < 0)
1277 return ret;
1278#if CONFIG_LIBFRIBIDI
1279 if (s->text_shaping)
1280 if ((ret = shape_text(ctx)) < 0)
1281 return ret;
1282#endif
1283 }
1284
1285 s->var_values[VAR_N] = inlink->frame_count+s->start_number;
1286 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1287 NAN : frame->pts * av_q2d(inlink->time_base);
1288
1289 s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1290 s->metadata = av_frame_get_metadata(frame);
1291
1292 draw_text(ctx, frame, frame->width, frame->height);
1293
1294 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1295 (int)s->var_values[VAR_N], s->var_values[VAR_T],
1296 (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1297 s->x, s->y);
1298
1299 return ff_filter_frame(outlink, frame);
1300}
1301
1302static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1303 {
1304 .name = "default",
1305 .type = AVMEDIA_TYPE_VIDEO,
1306 .filter_frame = filter_frame,
1307 .config_props = config_input,
1308 .needs_writable = 1,
1309 },
1310 { NULL }
1311};
1312
1313static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1314 {
1315 .name = "default",
1316 .type = AVMEDIA_TYPE_VIDEO,
1317 },
1318 { NULL }
1319};
1320
1321AVFilter ff_vf_drawtext = {
1322 .name = "drawtext",
1323 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1324 .priv_size = sizeof(DrawTextContext),
1325 .priv_class = &drawtext_class,
1326 .init = init,
1327 .uninit = uninit,
1328 .query_formats = query_formats,
1329 .inputs = avfilter_vf_drawtext_inputs,
1330 .outputs = avfilter_vf_drawtext_outputs,
1331 .process_command = command,
2ba45a60 1332 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
2ba45a60 1333};
ffmpeg Piment Noir Debian package repository