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>
6 * This file is part of FFmpeg.
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.
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.
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
25 * drawtext filter, based on the original vhook/drawtext.c
26 * filter by Gustavo Sverzut Barbieri
32 #include "libavutil/colorspace.h"
33 #include "libavutil/file.h"
34 #include "libavutil/eval.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/random_seed.h"
37 #include "libavutil/parseutils.h"
38 #include "libavutil/pixdesc.h"
39 #include "libavutil/tree.h"
40 #include "libavutil/lfg.h"
42 #include "drawutils.h"
47 #include <freetype/config/ftheader.h>
48 #include FT_FREETYPE_H
51 static const char * const var_names[] = {
52 "main_w", "w", "W", ///< width of the input video
53 "main_h", "h", "H", ///< height of the input video
54 "tw", "text_w", ///< width of the rendered text
55 "th", "text_h", ///< height of the rendered text
56 "max_glyph_w", ///< max glyph width
57 "max_glyph_h", ///< max glyph height
58 "max_glyph_a", "ascent", ///< max glyph ascent
59 "max_glyph_d", "descent", ///< min glyph descent
60 "line_h", "lh", ///< line height, same as max_glyph_h
67 "n", ///< number of frame
68 "t", ///< timestamp expressed in seconds
72 static const char *fun2_names[] = {
76 static double drand(void *opaque, double min, double max)
78 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
81 typedef double (*eval_func2)(void *, double a, double b);
83 static const eval_func2 fun2[] = {
89 VAR_MAIN_W, VAR_w, VAR_W,
90 VAR_MAIN_H, VAR_h, VAR_H,
95 VAR_MAX_GLYPH_A, VAR_ASCENT,
96 VAR_MAX_GLYPH_D, VAR_DESCENT,
110 const AVClass *class;
111 int reinit; ///< tells if the filter is being reinited
112 uint8_t *fontfile; ///< font to be used
113 uint8_t *text; ///< text to be drawn
114 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
115 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
116 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
117 FT_Vector *positions; ///< positions for each element in the text
118 size_t nb_positions; ///< number of elements of positions array
119 char *textfile; ///< file with text to be drawn
120 int x; ///< x position to start drawing text
121 int y; ///< y position to start drawing text
122 int max_glyph_w; ///< max glyph width
123 int max_glyph_h; ///< max glyph heigth
124 int shadowx, shadowy;
125 unsigned int fontsize; ///< font size to use
126 char *fontcolor_string; ///< font color as string
127 char *boxcolor_string; ///< box color as string
128 char *shadowcolor_string; ///< shadow color as string
129 uint8_t fontcolor[4]; ///< foreground color
130 uint8_t boxcolor[4]; ///< background color
131 uint8_t shadowcolor[4]; ///< shadow color
132 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
133 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
134 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
136 short int draw_box; ///< draw box around text - true or false
137 int use_kerning; ///< font kerning is used - true/false
138 int tabsize; ///< tab size
140 FT_Library library; ///< freetype font library handle
141 FT_Face face; ///< freetype font face handle
142 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
143 int hsub, vsub; ///< chroma subsampling values
145 int pixel_step[4]; ///< distance in bytes between the component of each pixel
146 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
147 uint8_t *box_line[4]; ///< line used for filling the box background
148 char *x_expr; ///< expression for x position
149 char *y_expr; ///< expression for y position
150 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
151 int64_t basetime; ///< base pts time in the real world for display
152 double var_values[VAR_VARS_NB];
155 int draw; ///< set to zero to prevent drawing
156 AVLFG prng; ///< random
159 #define OFFSET(x) offsetof(DrawTextContext, x)
161 static const AVOption drawtext_options[]= {
162 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
163 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
164 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
165 {"fontcolor", "set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
166 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
167 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
168 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
169 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, INT_MAX },
170 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
171 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
172 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
173 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
174 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
175 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX },
176 {"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
178 /* FT_LOAD_* flags */
179 {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
180 {"default", "set default", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
181 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
182 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
183 {"render", "set render", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
184 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
185 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
186 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
187 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
188 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
189 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
190 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
191 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
192 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
193 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
194 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
198 static const char *drawtext_get_name(void *ctx)
203 static const AVClass drawtext_class = {
209 #undef __FTERRORS_H__
210 #define FT_ERROR_START_LIST {
211 #define FT_ERRORDEF(e, v, s) { (e), (s) },
212 #define FT_ERROR_END_LIST { 0, NULL } };
218 } static ft_errors[] =
221 #define FT_ERRMSG(e) ft_errors[e].err_msg
226 FT_Bitmap bitmap; ///< array holding bitmaps of font
233 static int glyph_cmp(void *key, const void *b)
235 const Glyph *a = key, *bb = b;
236 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
237 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
241 * Load glyphs corresponding to the UTF-32 codepoint code.
243 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
245 DrawTextContext *dtext = ctx->priv;
247 struct AVTreeNode *node = NULL;
250 /* load glyph into dtext->face->glyph */
251 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
252 return AVERROR(EINVAL);
255 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
256 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
257 ret = AVERROR(ENOMEM);
262 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
263 ret = AVERROR(EINVAL);
267 glyph->bitmap = dtext->face->glyph->bitmap;
268 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
269 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
270 glyph->advance = dtext->face->glyph->advance.x >> 6;
272 /* measure text height to calculate text_height (or the maximum text height) */
273 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
275 /* cache the newly created glyph */
276 if (!(node = av_mallocz(av_tree_node_size))) {
277 ret = AVERROR(ENOMEM);
280 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
288 av_freep(&glyph->glyph);
294 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
297 DrawTextContext *dtext = ctx->priv;
300 dtext->class = &drawtext_class;
301 av_opt_set_defaults(dtext);
303 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
304 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
308 if (!dtext->fontfile) {
309 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
310 return AVERROR(EINVAL);
313 if (dtext->textfile) {
318 av_log(ctx, AV_LOG_ERROR,
319 "Both text and text file provided. Please provide only one\n");
320 return AVERROR(EINVAL);
322 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
323 av_log(ctx, AV_LOG_ERROR,
324 "The text file '%s' could not be read or is empty\n",
329 if (!(dtext->text = av_malloc(textbuf_size+1)))
330 return AVERROR(ENOMEM);
331 memcpy(dtext->text, textbuf, textbuf_size);
332 dtext->text[textbuf_size] = 0;
333 av_file_unmap(textbuf, textbuf_size);
337 av_log(ctx, AV_LOG_ERROR,
338 "Either text or a valid file must be provided\n");
339 return AVERROR(EINVAL);
342 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
343 av_log(ctx, AV_LOG_ERROR,
344 "Invalid font color '%s'\n", dtext->fontcolor_string);
348 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
349 av_log(ctx, AV_LOG_ERROR,
350 "Invalid box color '%s'\n", dtext->boxcolor_string);
354 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
355 av_log(ctx, AV_LOG_ERROR,
356 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
360 if ((err = FT_Init_FreeType(&(dtext->library)))) {
361 av_log(ctx, AV_LOG_ERROR,
362 "Could not load FreeType: %s\n", FT_ERRMSG(err));
363 return AVERROR(EINVAL);
366 /* load the face, and set up the encoding, which is by default UTF-8 */
367 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
368 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
369 dtext->fontfile, FT_ERRMSG(err));
370 return AVERROR(EINVAL);
372 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
373 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
374 dtext->fontsize, FT_ERRMSG(err));
375 return AVERROR(EINVAL);
378 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
380 /* load the fallback glyph with code 0 */
381 load_glyph(ctx, NULL, 0);
383 /* set the tabsize in pixels */
384 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
385 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
388 dtext->tabsize *= glyph->advance;
393 static int query_formats(AVFilterContext *ctx)
395 static const enum PixelFormat pix_fmts[] = {
396 PIX_FMT_ARGB, PIX_FMT_RGBA,
397 PIX_FMT_ABGR, PIX_FMT_BGRA,
398 PIX_FMT_RGB24, PIX_FMT_BGR24,
399 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
400 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
401 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
405 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
409 static int glyph_enu_free(void *opaque, void *elem)
415 static av_cold void uninit(AVFilterContext *ctx)
417 DrawTextContext *dtext = ctx->priv;
420 av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
421 av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
423 av_freep(&dtext->boxcolor_string);
424 av_freep(&dtext->expanded_text);
425 av_freep(&dtext->fontcolor_string);
426 av_freep(&dtext->fontfile);
427 av_freep(&dtext->shadowcolor_string);
428 av_freep(&dtext->text);
429 av_freep(&dtext->x_expr);
430 av_freep(&dtext->y_expr);
432 av_freep(&dtext->positions);
433 dtext->nb_positions = 0;
435 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
436 av_tree_destroy(dtext->glyphs);
437 dtext->glyphs = NULL;
439 FT_Done_Face(dtext->face);
440 FT_Done_FreeType(dtext->library);
442 for (i = 0; i < 4; i++) {
443 av_freep(&dtext->box_line[i]);
444 dtext->pixel_step[i] = 0;
448 static inline int is_newline(uint32_t c)
450 return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
453 static int config_input(AVFilterLink *inlink)
455 AVFilterContext *ctx = inlink->dst;
456 DrawTextContext *dtext = ctx->priv;
457 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
460 dtext->hsub = pix_desc->log2_chroma_w;
461 dtext->vsub = pix_desc->log2_chroma_h;
464 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
465 inlink->w, dtext->boxcolor,
466 inlink->format, dtext->boxcolor_rgba,
467 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
470 if (!dtext->is_packed_rgb) {
471 uint8_t *rgba = dtext->fontcolor_rgba;
472 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
473 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
474 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
475 dtext->fontcolor[3] = rgba[3];
476 rgba = dtext->shadowcolor_rgba;
477 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
478 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
479 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
480 dtext->shadowcolor[3] = rgba[3];
483 dtext->var_values[VAR_w] = dtext->var_values[VAR_W] = dtext->var_values[VAR_MAIN_W] = inlink->w;
484 dtext->var_values[VAR_h] = dtext->var_values[VAR_H] = dtext->var_values[VAR_MAIN_H] = inlink->h;
485 dtext->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
486 dtext->var_values[VAR_DAR] = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
487 dtext->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
488 dtext->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
489 dtext->var_values[VAR_X] = NAN;
490 dtext->var_values[VAR_Y] = NAN;
492 dtext->var_values[VAR_N] = 0;
493 dtext->var_values[VAR_T] = NAN;
495 av_lfg_init(&dtext->prng, av_get_random_seed());
497 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
498 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
499 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
500 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
501 (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
502 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
504 return AVERROR(EINVAL);
509 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
511 DrawTextContext *dtext = ctx->priv;
513 if (!strcmp(cmd, "reinit")) {
517 if ((ret = init(ctx, arg, NULL)) < 0)
519 return config_input(ctx->inputs[0]);
522 return AVERROR(ENOSYS);
525 #define GET_BITMAP_VAL(r, c) \
526 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
527 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
528 bitmap->buffer[(r) * bitmap->pitch + (c)]
530 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
531 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
532 alpha = yuva_color[3] * (val) * 129; \
533 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
534 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
535 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
536 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
537 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
538 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
542 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
543 int x, int y, int width, int height,
544 const uint8_t yuva_color[4], int hsub, int vsub)
547 unsigned int luma_pos, chroma_pos1, chroma_pos2;
550 for (r = 0; r < bitmap->rows && r+y < height; r++) {
551 for (c = 0; c < bitmap->width && c+x < width; c++) {
552 if (c+x < 0 || r+y < 0)
555 /* get intensity value in the glyph bitmap (source) */
556 src_val = GET_BITMAP_VAL(r, c);
560 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
567 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
568 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
569 alpha = rgba_color[3] * (val) * 129; \
570 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
571 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
572 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
575 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
576 int x, int y, int width, int height, int pixel_step,
577 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
583 for (r = 0; r < bitmap->rows && r+y < height; r++) {
584 for (c = 0; c < bitmap->width && c+x < width; c++) {
585 if (c+x < 0 || r+y < 0)
587 /* get intensity value in the glyph bitmap (source) */
588 src_val = GET_BITMAP_VAL(r, c);
592 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
593 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
600 static inline void drawbox(AVFilterBufferRef *picref, int x, int y,
601 int width, int height,
602 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
603 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
607 if (color[3] != 0xFF) {
608 if (is_rgba_packed) {
610 for (j = 0; j < height; j++)
611 for (i = 0; i < width; i++)
612 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
613 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
615 unsigned int luma_pos, chroma_pos1, chroma_pos2;
616 for (j = 0; j < height; j++)
617 for (i = 0; i < width; i++)
618 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
621 ff_draw_rectangle(picref->data, picref->linesize,
622 line, pixel_step, hsub, vsub,
623 x, y, width, height);
627 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
628 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
630 char *text = dtext->expanded_text;
636 for (i = 0, p = text; *p; i++) {
638 GET_UTF8(code, *p++, continue;);
640 /* skip new line chars, just go to new line */
641 if (code == '\n' || code == '\r' || code == '\t')
645 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
647 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
648 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
649 return AVERROR(EINVAL);
651 x1 = dtext->positions[i].x+dtext->x+x;
652 y1 = dtext->positions[i].y+dtext->y+y;
654 if (dtext->is_packed_rgb) {
655 draw_glyph_rgb(picref, &glyph->bitmap,
656 x1, y1, width, height,
657 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
659 draw_glyph_yuv(picref, &glyph->bitmap,
660 x1, y1, width, height,
661 yuvcolor, dtext->hsub, dtext->vsub);
668 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
669 int width, int height)
671 DrawTextContext *dtext = ctx->priv;
672 uint32_t code = 0, prev_code = 0;
673 int x = 0, y = 0, i = 0, ret;
674 int max_text_line_w = 0, len;
676 char *text = dtext->text;
678 int y_min = 32000, y_max = -32000;
679 int x_min = 32000, x_max = -32000;
681 Glyph *glyph = NULL, *prev_glyph = NULL;
684 time_t now = time(0);
686 uint8_t *buf = dtext->expanded_text;
687 int buf_size = dtext->expanded_text_size;
689 if(dtext->basetime != AV_NOPTS_VALUE)
690 now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
693 buf_size = 2*strlen(dtext->text)+1;
694 buf = av_malloc(buf_size);
698 localtime_r(&now, <ime);
700 if(strchr(dtext->text, '%'))
701 ltime= *localtime(&now);
706 if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0)
709 } while ((buf = av_realloc(buf, buf_size)));
712 return AVERROR(ENOMEM);
713 text = dtext->expanded_text = buf;
714 dtext->expanded_text_size = buf_size;
715 if ((len = strlen(text)) > dtext->nb_positions) {
716 if (!(dtext->positions =
717 av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
718 return AVERROR(ENOMEM);
719 dtext->nb_positions = len;
725 /* load and cache glyphs */
726 for (i = 0, p = text; *p; i++) {
727 GET_UTF8(code, *p++, continue;);
731 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
733 load_glyph(ctx, &glyph, code);
735 y_min = FFMIN(glyph->bbox.yMin, y_min);
736 y_max = FFMAX(glyph->bbox.yMax, y_max);
737 x_min = FFMIN(glyph->bbox.xMin, x_min);
738 x_max = FFMAX(glyph->bbox.xMax, x_max);
740 dtext->max_glyph_h = y_max - y_min;
741 dtext->max_glyph_w = x_max - x_min;
743 /* compute and save position for each glyph */
745 for (i = 0, p = text; *p; i++) {
746 GET_UTF8(code, *p++, continue;);
748 /* skip the \n in the sequence \r\n */
749 if (prev_code == '\r' && code == '\n')
753 if (is_newline(code)) {
754 max_text_line_w = FFMAX(max_text_line_w, x);
755 y += dtext->max_glyph_h;
763 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
766 if (dtext->use_kerning && prev_glyph && glyph->code) {
767 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
768 ft_kerning_default, &delta);
773 dtext->positions[i].x = x + glyph->bitmap_left;
774 dtext->positions[i].y = y - glyph->bitmap_top + y_max;
775 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
776 else x += glyph->advance;
779 max_text_line_w = FFMAX(x, max_text_line_w);
781 dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
782 dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
784 dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
785 dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
786 dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
787 dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
789 dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
791 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
792 dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
793 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
794 dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
799 dtext->x &= ~((1 << dtext->hsub) - 1);
800 dtext->y &= ~((1 << dtext->vsub) - 1);
802 box_w = FFMIN(width - 1 , max_text_line_w);
803 box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
807 drawbox(picref, dtext->x, dtext->y, box_w, box_h,
808 dtext->box_line, dtext->pixel_step, dtext->boxcolor_rgba,
809 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
811 if (dtext->shadowx || dtext->shadowy) {
812 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
813 dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
817 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
818 dtext->fontcolor, 0, 0)) < 0)
824 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
826 static void end_frame(AVFilterLink *inlink)
828 AVFilterContext *ctx = inlink->dst;
829 AVFilterLink *outlink = ctx->outputs[0];
830 DrawTextContext *dtext = ctx->priv;
831 AVFilterBufferRef *picref = inlink->cur_buf;
833 dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
834 NAN : picref->pts * av_q2d(inlink->time_base);
836 draw_text(ctx, picref, picref->video->w, picref->video->h);
838 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
839 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
840 (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
843 dtext->var_values[VAR_N] += 1.0;
845 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
846 avfilter_end_frame(outlink);
849 AVFilter avfilter_vf_drawtext = {
851 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
852 .priv_size = sizeof(DrawTextContext),
855 .query_formats = query_formats,
857 .inputs = (const AVFilterPad[]) {{ .name = "default",
858 .type = AVMEDIA_TYPE_VIDEO,
859 .get_video_buffer = avfilter_null_get_video_buffer,
860 .start_frame = avfilter_null_start_frame,
861 .draw_slice = null_draw_slice,
862 .end_frame = end_frame,
863 .config_props = config_input,
864 .min_perms = AV_PERM_WRITE |
866 .rej_perms = AV_PERM_PRESERVE },
868 .outputs = (const AVFilterPad[]) {{ .name = "default",
869 .type = AVMEDIA_TYPE_VIDEO, },
871 .process_command = command,