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Merge remote-tracking branch 'libav/master'
[FFMpeg-mirror/mplayer-patches.git] / libavfilter / vf_drawtext.c
blob8e8ac8d554518370775706b614f7335e860bf5bf
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 Libav.
7 *
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * drawtext filter, based on the original vhook/drawtext.c
26 * filter by Gustavo Sverzut Barbieri
27 */
28
29 #include <sys/time.h>
30 #include <time.h>
31
32 #include "libavutil/colorspace.h"
33 #include "libavutil/common.h"
34 #include "libavutil/file.h"
35 #include "libavutil/eval.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/random_seed.h"
39 #include "libavutil/parseutils.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/tree.h"
42 #include "libavutil/lfg.h"
43 #include "avfilter.h"
44 #include "drawutils.h"
45 #include "formats.h"
46 #include "internal.h"
47 #include "video.h"
48
49 #include <ft2build.h>
50 #include <freetype/config/ftheader.h>
51 #include FT_FREETYPE_H
52 #include FT_GLYPH_H
53
54 static const char *const var_names[] = {
55 "E",
56 "PHI",
57 "PI",
58 "main_w", "W", ///< width of the main video
59 "main_h", "H", ///< height of the main video
60 "text_w", "w", ///< width of the overlay text
61 "text_h", "h", ///< height of the overlay text
62 "x",
63 "y",
64 "n", ///< number of processed frames
65 "t", ///< timestamp expressed in seconds
66 NULL
67 };
68
69 static const char *const fun2_names[] = {
70 "rand"
71 };
72
73 static double drand(void *opaque, double min, double max)
74 {
75 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
76 }
77
78 typedef double (*eval_func2)(void *, double a, double b);
79
80 static const eval_func2 fun2[] = {
81 drand,
82 NULL
83 };
84
85 enum var_name {
86 VAR_E,
87 VAR_PHI,
88 VAR_PI,
89 VAR_MAIN_W, VAR_MW,
90 VAR_MAIN_H, VAR_MH,
91 VAR_TEXT_W, VAR_TW,
92 VAR_TEXT_H, VAR_TH,
93 VAR_X,
94 VAR_Y,
95 VAR_N,
96 VAR_T,
97 VAR_VARS_NB
98 };
99
100 typedef struct {
101 const AVClass *class;
102 uint8_t *fontfile; ///< font to be used
103 uint8_t *text; ///< text to be drawn
104 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
105 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
106 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
107 FT_Vector *positions; ///< positions for each element in the text
108 size_t nb_positions; ///< number of elements of positions array
109 char *textfile; ///< file with text to be drawn
110 int x, y; ///< position to start drawing text
111 int w, h; ///< dimension of the text block
112 int shadowx, shadowy;
113 unsigned int fontsize; ///< font size to use
114 char *fontcolor_string; ///< font color as string
115 char *boxcolor_string; ///< box color as string
116 char *shadowcolor_string; ///< shadow color as string
117 uint8_t fontcolor[4]; ///< foreground color
118 uint8_t boxcolor[4]; ///< background color
119 uint8_t shadowcolor[4]; ///< shadow color
120 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
121 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
122 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
123
124 short int draw_box; ///< draw box around text - true or false
125 int use_kerning; ///< font kerning is used - true/false
126 int tabsize; ///< tab size
127 int fix_bounds; ///< do we let it go out of frame bounds - t/f
128
129 FT_Library library; ///< freetype font library handle
130 FT_Face face; ///< freetype font face handle
131 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
132 int hsub, vsub; ///< chroma subsampling values
133 int is_packed_rgb;
134 int pixel_step[4]; ///< distance in bytes between the component of each pixel
135 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
136 uint8_t *box_line[4]; ///< line used for filling the box background
137 char *x_expr, *y_expr;
138 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
139 double var_values[VAR_VARS_NB];
140 char *d_expr;
141 AVExpr *d_pexpr;
142 int draw; ///< set to zero to prevent drawing
143 AVLFG prng; ///< random
144 } DrawTextContext;
145
146 #define OFFSET(x) offsetof(DrawTextContext, x)
147
148 static const AVOption drawtext_options[]= {
149 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
150 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
151 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
152 {"fontcolor","set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
153 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
154 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
155 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 },
156 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=16}, 1, 72 },
157 {"x", "set x", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
158 {"y", "set y", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
159 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX },
160 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX },
161 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX },
162 {"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
163 {"fix_bounds", "if true, check and fix text coords to avoid clipping",
164 OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1 },
165
166 /* FT_LOAD_* flags */
167 {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, {.i64=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
168 {"default", "set default", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
169 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
170 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
171 {"render", "set render", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
172 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
173 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
174 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
175 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
176 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
177 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
178 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
179 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
180 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
181 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
182 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.i64 = FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
183 {NULL},
184 };
185
186 static const char *drawtext_get_name(void *ctx)
187 {
188 return "drawtext";
189 }
190
191 static const AVClass drawtext_class = {
192 "DrawTextContext",
193 drawtext_get_name,
194 drawtext_options
195 };
196
197 #undef __FTERRORS_H__
198 #define FT_ERROR_START_LIST {
199 #define FT_ERRORDEF(e, v, s) { (e), (s) },
200 #define FT_ERROR_END_LIST { 0, NULL } };
201
202 struct ft_error
203 {
204 int err;
205 const char *err_msg;
206 } static ft_errors[] =
207 #include FT_ERRORS_H
208
209 #define FT_ERRMSG(e) ft_errors[e].err_msg
210
211 typedef struct {
212 FT_Glyph *glyph;
213 uint32_t code;
214 FT_Bitmap bitmap; ///< array holding bitmaps of font
215 FT_BBox bbox;
216 int advance;
217 int bitmap_left;
218 int bitmap_top;
219 } Glyph;
220
221 static int glyph_cmp(void *key, const void *b)
222 {
223 const Glyph *a = key, *bb = b;
224 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
225 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
226 }
227
228 /**
229 * Load glyphs corresponding to the UTF-32 codepoint code.
230 */
231 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
232 {
233 DrawTextContext *dtext = ctx->priv;
234 Glyph *glyph;
235 struct AVTreeNode *node = NULL;
236 int ret;
237
238 /* load glyph into dtext->face->glyph */
239 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
240 return AVERROR(EINVAL);
241
242 /* save glyph */
243 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
244 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
245 ret = AVERROR(ENOMEM);
246 goto error;
247 }
248 glyph->code = code;
249
250 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
251 ret = AVERROR(EINVAL);
252 goto error;
253 }
254
255 glyph->bitmap = dtext->face->glyph->bitmap;
256 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
257 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
258 glyph->advance = dtext->face->glyph->advance.x >> 6;
259
260 /* measure text height to calculate text_height (or the maximum text height) */
261 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
262
263 /* cache the newly created glyph */
264 if (!(node = av_tree_node_alloc())) {
265 ret = AVERROR(ENOMEM);
266 goto error;
267 }
268 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
269
270 if (glyph_ptr)
271 *glyph_ptr = glyph;
272 return 0;
273
274 error:
275 if (glyph)
276 av_freep(&glyph->glyph);
277 av_freep(&glyph);
278 av_freep(&node);
279 return ret;
280 }
281
282 static av_cold int init(AVFilterContext *ctx, const char *args)
283 {
284 int err;
285 DrawTextContext *dtext = ctx->priv;
286 Glyph *glyph;
287
288 dtext->class = &drawtext_class;
289 av_opt_set_defaults(dtext);
290 dtext->fontcolor_string = av_strdup("black");
291 dtext->boxcolor_string = av_strdup("white");
292 dtext->shadowcolor_string = av_strdup("black");
293
294 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
295 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
296 return err;
297 }
298
299 if (!dtext->fontfile) {
300 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
301 return AVERROR(EINVAL);
302 }
303
304 if (dtext->textfile) {
305 uint8_t *textbuf;
306 size_t textbuf_size;
307
308 if (dtext->text) {
309 av_log(ctx, AV_LOG_ERROR,
310 "Both text and text file provided. Please provide only one\n");
311 return AVERROR(EINVAL);
312 }
313 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
314 av_log(ctx, AV_LOG_ERROR,
315 "The text file '%s' could not be read or is empty\n",
316 dtext->textfile);
317 return err;
318 }
319
320 if (!(dtext->text = av_malloc(textbuf_size+1)))
321 return AVERROR(ENOMEM);
322 memcpy(dtext->text, textbuf, textbuf_size);
323 dtext->text[textbuf_size] = 0;
324 av_file_unmap(textbuf, textbuf_size);
325 }
326
327 if (!dtext->text) {
328 av_log(ctx, AV_LOG_ERROR,
329 "Either text or a valid file must be provided\n");
330 return AVERROR(EINVAL);
331 }
332
333 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
334 av_log(ctx, AV_LOG_ERROR,
335 "Invalid font color '%s'\n", dtext->fontcolor_string);
336 return err;
337 }
338
339 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
340 av_log(ctx, AV_LOG_ERROR,
341 "Invalid box color '%s'\n", dtext->boxcolor_string);
342 return err;
343 }
344
345 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
346 av_log(ctx, AV_LOG_ERROR,
347 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
348 return err;
349 }
350
351 if ((err = FT_Init_FreeType(&(dtext->library)))) {
352 av_log(ctx, AV_LOG_ERROR,
353 "Could not load FreeType: %s\n", FT_ERRMSG(err));
354 return AVERROR(EINVAL);
355 }
356
357 /* load the face, and set up the encoding, which is by default UTF-8 */
358 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
359 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
360 dtext->fontfile, FT_ERRMSG(err));
361 return AVERROR(EINVAL);
362 }
363 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
364 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
365 dtext->fontsize, FT_ERRMSG(err));
366 return AVERROR(EINVAL);
367 }
368
369 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
370
371 /* load the fallback glyph with code 0 */
372 load_glyph(ctx, NULL, 0);
373
374 /* set the tabsize in pixels */
375 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
376 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
377 return err;
378 }
379 dtext->tabsize *= glyph->advance;
380
381 #if !HAVE_LOCALTIME_R
382 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
383 #endif
384
385 return 0;
386 }
387
388 static int query_formats(AVFilterContext *ctx)
389 {
390 static const enum AVPixelFormat pix_fmts[] = {
391 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
392 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
393 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
394 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,
395 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
396 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
397 AV_PIX_FMT_NONE
398 };
399
400 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
401 return 0;
402 }
403
404 static int glyph_enu_free(void *opaque, void *elem)
405 {
406 av_free(elem);
407 return 0;
408 }
409
410 static av_cold void uninit(AVFilterContext *ctx)
411 {
412 DrawTextContext *dtext = ctx->priv;
413 int i;
414
415 av_freep(&dtext->fontfile);
416 av_freep(&dtext->text);
417 av_freep(&dtext->expanded_text);
418 av_freep(&dtext->fontcolor_string);
419 av_freep(&dtext->boxcolor_string);
420 av_freep(&dtext->positions);
421 av_freep(&dtext->shadowcolor_string);
422 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
423 av_tree_destroy(dtext->glyphs);
424 dtext->glyphs = 0;
425 FT_Done_Face(dtext->face);
426 FT_Done_FreeType(dtext->library);
427
428 for (i = 0; i < 4; i++) {
429 av_freep(&dtext->box_line[i]);
430 dtext->pixel_step[i] = 0;
431 }
432
433 }
434
435 static inline int is_newline(uint32_t c)
436 {
437 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
438 }
439
440 static int dtext_prepare_text(AVFilterContext *ctx)
441 {
442 DrawTextContext *dtext = ctx->priv;
443 uint32_t code = 0, prev_code = 0;
444 int x = 0, y = 0, i = 0, ret;
445 int text_height, baseline;
446 char *text = dtext->text;
447 uint8_t *p;
448 int str_w = 0, len;
449 int y_min = 32000, y_max = -32000;
450 FT_Vector delta;
451 Glyph *glyph = NULL, *prev_glyph = NULL;
452 Glyph dummy = { 0 };
453 int width = ctx->inputs[0]->w;
454 int height = ctx->inputs[0]->h;
455
456 #if HAVE_LOCALTIME_R
457 time_t now = time(0);
458 struct tm ltime;
459 uint8_t *buf = dtext->expanded_text;
460 int buf_size = dtext->expanded_text_size;
461
462 if (!buf)
463 buf_size = 2*strlen(dtext->text)+1;
464
465 localtime_r(&now, &ltime);
466
467 while ((buf = av_realloc(buf, buf_size))) {
468 *buf = 1;
469 if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)
470 break;
471 buf_size *= 2;
472 }
473
474 if (!buf)
475 return AVERROR(ENOMEM);
476 text = dtext->expanded_text = buf;
477 dtext->expanded_text_size = buf_size;
478 #endif
479
480 if ((len = strlen(text)) > dtext->nb_positions) {
481 FT_Vector *p = av_realloc(dtext->positions,
482 len * sizeof(*dtext->positions));
483 if (!p) {
484 av_freep(dtext->positions);
485 dtext->nb_positions = 0;
486 return AVERROR(ENOMEM);
487 } else {
488 dtext->positions = p;
489 dtext->nb_positions = len;
490 }
491 }
492
493 /* load and cache glyphs */
494 for (i = 0, p = text; *p; i++) {
495 GET_UTF8(code, *p++, continue;);
496
497 /* get glyph */
498 dummy.code = code;
499 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
500 if (!glyph) {
501 ret = load_glyph(ctx, &glyph, code);
502 if (ret)
503 return ret;
504 }
505
506 y_min = FFMIN(glyph->bbox.yMin, y_min);
507 y_max = FFMAX(glyph->bbox.yMax, y_max);
508 }
509 text_height = y_max - y_min;
510 baseline = y_max;
511
512 /* compute and save position for each glyph */
513 glyph = NULL;
514 for (i = 0, p = text; *p; i++) {
515 GET_UTF8(code, *p++, continue;);
516
517 /* skip the \n in the sequence \r\n */
518 if (prev_code == '\r' && code == '\n')
519 continue;
520
521 prev_code = code;
522 if (is_newline(code)) {
523 str_w = FFMAX(str_w, x - dtext->x);
524 y += text_height;
525 x = 0;
526 continue;
527 }
528
529 /* get glyph */
530 prev_glyph = glyph;
531 dummy.code = code;
532 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
533
534 /* kerning */
535 if (dtext->use_kerning && prev_glyph && glyph->code) {
536 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
537 ft_kerning_default, &delta);
538 x += delta.x >> 6;
539 }
540
541 if (x + glyph->bbox.xMax >= width) {
542 str_w = FFMAX(str_w, x);
543 y += text_height;
544 x = 0;
545 }
546
547 /* save position */
548 dtext->positions[i].x = x + glyph->bitmap_left;
549 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
550 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
551 else x += glyph->advance;
552 }
553
554 str_w = FFMIN(width - 1, FFMAX(str_w, x));
555 y = FFMIN(y + text_height, height - 1);
556
557 dtext->w = str_w;
558 dtext->var_values[VAR_TEXT_W] = dtext->var_values[VAR_TW] = dtext->w;
559 dtext->h = y;
560 dtext->var_values[VAR_TEXT_H] = dtext->var_values[VAR_TH] = dtext->h;
561
562 return 0;
563 }
564
565
566 static int config_input(AVFilterLink *inlink)
567 {
568 AVFilterContext *ctx = inlink->dst;
569 DrawTextContext *dtext = ctx->priv;
570 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
571 int ret;
572
573 dtext->hsub = pix_desc->log2_chroma_w;
574 dtext->vsub = pix_desc->log2_chroma_h;
575
576 dtext->var_values[VAR_E ] = M_E;
577 dtext->var_values[VAR_PHI] = M_PHI;
578 dtext->var_values[VAR_PI ] = M_PI;
579
580 dtext->var_values[VAR_MAIN_W] =
581 dtext->var_values[VAR_MW] = ctx->inputs[0]->w;
582 dtext->var_values[VAR_MAIN_H] =
583 dtext->var_values[VAR_MH] = ctx->inputs[0]->h;
584
585 dtext->var_values[VAR_X] = 0;
586 dtext->var_values[VAR_Y] = 0;
587 dtext->var_values[VAR_N] = 0;
588 dtext->var_values[VAR_T] = NAN;
589
590 av_lfg_init(&dtext->prng, av_get_random_seed());
591
592 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
593 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
594 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
595 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
596 (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
597 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
598 return AVERROR(EINVAL);
599
600 if ((ret =
601 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
602 inlink->w, dtext->boxcolor,
603 inlink->format, dtext->boxcolor_rgba,
604 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
605 return ret;
606
607 if (!dtext->is_packed_rgb) {
608 uint8_t *rgba = dtext->fontcolor_rgba;
609 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
610 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
611 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
612 dtext->fontcolor[3] = rgba[3];
613 rgba = dtext->shadowcolor_rgba;
614 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
615 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
616 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
617 dtext->shadowcolor[3] = rgba[3];
618 }
619
620 dtext->draw = 1;
621
622 return dtext_prepare_text(ctx);
623 }
624
625 #define GET_BITMAP_VAL(r, c) \
626 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
627 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
628 bitmap->buffer[(r) * bitmap->pitch + (c)]
629
630 #define SET_PIXEL_YUV(frame, yuva_color, val, x, y, hsub, vsub) { \
631 luma_pos = ((x) ) + ((y) ) * frame->linesize[0]; \
632 alpha = yuva_color[3] * (val) * 129; \
633 frame->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * frame->data[0][luma_pos] ) >> 23; \
634 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
635 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[1]; \
636 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * frame->linesize[2]; \
637 frame->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * frame->data[1][chroma_pos1]) >> 23; \
638 frame->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * frame->data[2][chroma_pos2]) >> 23; \
639 }\
640 }
641
642 static inline int draw_glyph_yuv(AVFrame *frame, FT_Bitmap *bitmap, unsigned int x,
643 unsigned int y, unsigned int width, unsigned int height,
644 const uint8_t yuva_color[4], int hsub, int vsub)
645 {
646 int r, c, alpha;
647 unsigned int luma_pos, chroma_pos1, chroma_pos2;
648 uint8_t src_val;
649
650 for (r = 0; r < bitmap->rows && r+y < height; r++) {
651 for (c = 0; c < bitmap->width && c+x < width; c++) {
652 /* get intensity value in the glyph bitmap (source) */
653 src_val = GET_BITMAP_VAL(r, c);
654 if (!src_val)
655 continue;
656
657 SET_PIXEL_YUV(frame, yuva_color, src_val, c+x, y+r, hsub, vsub);
658 }
659 }
660
661 return 0;
662 }
663
664 #define SET_PIXEL_RGB(frame, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
665 p = frame->data[0] + (x) * pixel_step + ((y) * frame->linesize[0]); \
666 alpha = rgba_color[3] * (val) * 129; \
667 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
668 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
669 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
670 }
671
672 static inline int draw_glyph_rgb(AVFrame *frame, FT_Bitmap *bitmap,
673 unsigned int x, unsigned int y,
674 unsigned int width, unsigned int height, int pixel_step,
675 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
676 {
677 int r, c, alpha;
678 uint8_t *p;
679 uint8_t src_val;
680
681 for (r = 0; r < bitmap->rows && r+y < height; r++) {
682 for (c = 0; c < bitmap->width && c+x < width; c++) {
683 /* get intensity value in the glyph bitmap (source) */
684 src_val = GET_BITMAP_VAL(r, c);
685 if (!src_val)
686 continue;
687
688 SET_PIXEL_RGB(frame, rgba_color, src_val, c+x, y+r, pixel_step,
689 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
690 }
691 }
692
693 return 0;
694 }
695
696 static inline void drawbox(AVFrame *frame, unsigned int x, unsigned int y,
697 unsigned int width, unsigned int height,
698 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
699 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
700 {
701 int i, j, alpha;
702
703 if (color[3] != 0xFF) {
704 if (is_rgba_packed) {
705 uint8_t *p;
706 for (j = 0; j < height; j++)
707 for (i = 0; i < width; i++)
708 SET_PIXEL_RGB(frame, color, 255, i+x, y+j, pixel_step[0],
709 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
710 } else {
711 unsigned int luma_pos, chroma_pos1, chroma_pos2;
712 for (j = 0; j < height; j++)
713 for (i = 0; i < width; i++)
714 SET_PIXEL_YUV(frame, color, 255, i+x, y+j, hsub, vsub);
715 }
716 } else {
717 ff_draw_rectangle(frame->data, frame->linesize,
718 line, pixel_step, hsub, vsub,
719 x, y, width, height);
720 }
721 }
722
723 static int draw_glyphs(DrawTextContext *dtext, AVFrame *frame,
724 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
725 {
726 char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;
727 uint32_t code = 0;
728 int i;
729 uint8_t *p;
730 Glyph *glyph = NULL;
731
732 for (i = 0, p = text; *p; i++) {
733 Glyph dummy = { 0 };
734 GET_UTF8(code, *p++, continue;);
735
736 /* skip new line chars, just go to new line */
737 if (code == '\n' || code == '\r' || code == '\t')
738 continue;
739
740 dummy.code = code;
741 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
742
743 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
744 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
745 return AVERROR(EINVAL);
746
747 if (dtext->is_packed_rgb) {
748 draw_glyph_rgb(frame, &glyph->bitmap,
749 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
750 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
751 } else {
752 draw_glyph_yuv(frame, &glyph->bitmap,
753 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
754 yuvcolor, dtext->hsub, dtext->vsub);
755 }
756 }
757
758 return 0;
759 }
760
761 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
762 int width, int height)
763 {
764 DrawTextContext *dtext = ctx->priv;
765 int ret;
766
767 /* draw box */
768 if (dtext->draw_box)
769 drawbox(frame, dtext->x, dtext->y, dtext->w, dtext->h,
770 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
771 dtext->hsub, dtext->vsub, dtext->is_packed_rgb,
772 dtext->rgba_map);
773
774 if (dtext->shadowx || dtext->shadowy) {
775 if ((ret = draw_glyphs(dtext, frame, width, height,
776 dtext->shadowcolor_rgba,
777 dtext->shadowcolor,
778 dtext->x + dtext->shadowx,
779 dtext->y + dtext->shadowy)) < 0)
780 return ret;
781 }
782
783 if ((ret = draw_glyphs(dtext, frame, width, height,
784 dtext->fontcolor_rgba,
785 dtext->fontcolor,
786 dtext->x,
787 dtext->y)) < 0)
788 return ret;
789
790 return 0;
791 }
792
793 static inline int normalize_double(int *n, double d)
794 {
795 int ret = 0;
796
797 if (isnan(d)) {
798 ret = AVERROR(EINVAL);
799 } else if (d > INT_MAX || d < INT_MIN) {
800 *n = d > INT_MAX ? INT_MAX : INT_MIN;
801 ret = AVERROR(EINVAL);
802 } else
803 *n = round(d);
804
805 return ret;
806 }
807
808 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
809 {
810 AVFilterContext *ctx = inlink->dst;
811 DrawTextContext *dtext = ctx->priv;
812 int ret = 0;
813
814 if ((ret = dtext_prepare_text(ctx)) < 0) {
815 av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
816 av_frame_free(&frame);
817 return ret;
818 }
819
820 dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
821 NAN : frame->pts * av_q2d(inlink->time_base);
822 dtext->var_values[VAR_X] =
823 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
824 dtext->var_values[VAR_Y] =
825 av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
826 dtext->var_values[VAR_X] =
827 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
828
829 dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
830
831 normalize_double(&dtext->x, dtext->var_values[VAR_X]);
832 normalize_double(&dtext->y, dtext->var_values[VAR_Y]);
833
834 if (dtext->fix_bounds) {
835 if (dtext->x < 0) dtext->x = 0;
836 if (dtext->y < 0) dtext->y = 0;
837 if ((unsigned)dtext->x + (unsigned)dtext->w > inlink->w)
838 dtext->x = inlink->w - dtext->w;
839 if ((unsigned)dtext->y + (unsigned)dtext->h > inlink->h)
840 dtext->y = inlink->h - dtext->h;
841 }
842
843 dtext->x &= ~((1 << dtext->hsub) - 1);
844 dtext->y &= ~((1 << dtext->vsub) - 1);
845
846 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
847 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
848 dtext->x, dtext->y, dtext->x+dtext->w, dtext->y+dtext->h);
849
850 if (dtext->draw)
851 draw_text(inlink->dst, frame, frame->width, frame->height);
852
853 dtext->var_values[VAR_N] += 1.0;
854
855 return ff_filter_frame(inlink->dst->outputs[0], frame);
856 }
857
858 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
859 {
860 .name = "default",
861 .type = AVMEDIA_TYPE_VIDEO,
862 .get_video_buffer = ff_null_get_video_buffer,
863 .filter_frame = filter_frame,
864 .config_props = config_input,
865 .needs_writable = 1,
866 },
867 { NULL }
868 };
869
870 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
871 {
872 .name = "default",
873 .type = AVMEDIA_TYPE_VIDEO,
874 },
875 { NULL }
876 };
877
878 AVFilter avfilter_vf_drawtext = {
879 .name = "drawtext",
880 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
881 .priv_size = sizeof(DrawTextContext),
882 .init = init,
883 .uninit = uninit,
884 .query_formats = query_formats,
885
886 .inputs = avfilter_vf_drawtext_inputs,
887 .outputs = avfilter_vf_drawtext_outputs,
888 };
A couple of patches to make building with MPlayer easier