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
33 #include "libavcodec/timecode.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/colorspace.h"
36 #include "libavutil/file.h"
37 #include "libavutil/eval.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/random_seed.h"
40 #include "libavutil/parseutils.h"
41 #include "libavutil/pixdesc.h"
42 #include "libavutil/tree.h"
43 #include "libavutil/lfg.h"
45 #include "drawutils.h"
50 #include <freetype/config/ftheader.h>
51 #include FT_FREETYPE_H
54 static const char * const var_names[] = {
55 "main_w", "w", "W", ///< width of the input video
56 "main_h", "h", "H", ///< height of the input video
57 "tw", "text_w", ///< width of the rendered text
58 "th", "text_h", ///< height of the rendered text
59 "max_glyph_w", ///< max glyph width
60 "max_glyph_h", ///< max glyph height
61 "max_glyph_a", "ascent", ///< max glyph ascent
62 "max_glyph_d", "descent", ///< min glyph descent
63 "line_h", "lh", ///< line height, same as max_glyph_h
70 "n", ///< number of frame
71 "t", ///< timestamp expressed in seconds
75 static const char *fun2_names[] = {
79 static double drand(void *opaque, double min, double max)
81 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
84 typedef double (*eval_func2)(void *, double a, double b);
86 static const eval_func2 fun2[] = {
92 VAR_MAIN_W, VAR_w, VAR_W,
93 VAR_MAIN_H, VAR_h, VAR_H,
98 VAR_MAX_GLYPH_A, VAR_ASCENT,
99 VAR_MAX_GLYPH_D, VAR_DESCENT,
113 const AVClass *class;
114 int reinit; ///< tells if the filter is being reinited
115 uint8_t *fontfile; ///< font to be used
116 uint8_t *text; ///< text to be drawn
117 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
118 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
119 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
120 FT_Vector *positions; ///< positions for each element in the text
121 size_t nb_positions; ///< number of elements of positions array
122 char *textfile; ///< file with text to be drawn
123 int x; ///< x position to start drawing text
124 int y; ///< y position to start drawing text
125 int max_glyph_w; ///< max glyph width
126 int max_glyph_h; ///< max glyph heigth
127 int shadowx, shadowy;
128 unsigned int fontsize; ///< font size to use
129 char *fontcolor_string; ///< font color as string
130 char *boxcolor_string; ///< box color as string
131 char *shadowcolor_string; ///< shadow color as string
132 uint8_t fontcolor[4]; ///< foreground color
133 uint8_t boxcolor[4]; ///< background color
134 uint8_t shadowcolor[4]; ///< shadow color
135 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
136 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
137 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
139 short int draw_box; ///< draw box around text - true or false
140 int use_kerning; ///< font kerning is used - true/false
141 int tabsize; ///< tab size
143 FT_Library library; ///< freetype font library handle
144 FT_Face face; ///< freetype font face handle
145 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
146 int hsub, vsub; ///< chroma subsampling values
148 int pixel_step[4]; ///< distance in bytes between the component of each pixel
149 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
150 uint8_t *box_line[4]; ///< line used for filling the box background
151 char *x_expr; ///< expression for x position
152 char *y_expr; ///< expression for y position
153 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
154 int64_t basetime; ///< base pts time in the real world for display
155 double var_values[VAR_VARS_NB];
158 int draw; ///< set to zero to prevent drawing
159 AVLFG prng; ///< random
160 struct ff_timecode tc;
164 #define OFFSET(x) offsetof(DrawTextContext, x)
166 static const AVOption drawtext_options[]= {
167 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
168 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
169 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
170 {"fontcolor", "set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
171 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
172 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
173 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
174 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, INT_MAX },
175 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
176 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
177 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
178 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
179 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
180 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX },
181 {"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
182 {"timecode", "set initial timecode", OFFSET(tc.str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
183 {"r", "set rate (timecode only)", OFFSET(tc.rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
184 {"rate", "set rate (timecode only)", OFFSET(tc.rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
186 /* FT_LOAD_* flags */
187 {"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" },
188 {"default", "set default", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
189 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
190 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
191 {"render", "set render", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
192 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
193 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
194 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
195 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
196 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
197 {"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" },
198 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
199 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
200 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
201 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
202 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
206 static const char *drawtext_get_name(void *ctx)
211 static const AVClass drawtext_class = {
217 #undef __FTERRORS_H__
218 #define FT_ERROR_START_LIST {
219 #define FT_ERRORDEF(e, v, s) { (e), (s) },
220 #define FT_ERROR_END_LIST { 0, NULL } };
226 } static ft_errors[] =
229 #define FT_ERRMSG(e) ft_errors[e].err_msg
234 FT_Bitmap bitmap; ///< array holding bitmaps of font
241 static int glyph_cmp(void *key, const void *b)
243 const Glyph *a = key, *bb = b;
244 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
245 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
249 * Load glyphs corresponding to the UTF-32 codepoint code.
251 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
253 DrawTextContext *dtext = ctx->priv;
255 struct AVTreeNode *node = NULL;
258 /* load glyph into dtext->face->glyph */
259 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
260 return AVERROR(EINVAL);
263 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
264 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
265 ret = AVERROR(ENOMEM);
270 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
271 ret = AVERROR(EINVAL);
275 glyph->bitmap = dtext->face->glyph->bitmap;
276 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
277 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
278 glyph->advance = dtext->face->glyph->advance.x >> 6;
280 /* measure text height to calculate text_height (or the maximum text height) */
281 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
283 /* cache the newly created glyph */
284 if (!(node = av_mallocz(av_tree_node_size))) {
285 ret = AVERROR(ENOMEM);
288 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
296 av_freep(&glyph->glyph);
302 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
305 DrawTextContext *dtext = ctx->priv;
308 dtext->class = &drawtext_class;
309 av_opt_set_defaults(dtext);
311 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
312 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
316 if (!dtext->fontfile) {
317 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
318 return AVERROR(EINVAL);
321 if (dtext->textfile) {
326 av_log(ctx, AV_LOG_ERROR,
327 "Both text and text file provided. Please provide only one\n");
328 return AVERROR(EINVAL);
330 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
331 av_log(ctx, AV_LOG_ERROR,
332 "The text file '%s' could not be read or is empty\n",
337 if (!(dtext->text = av_malloc(textbuf_size+1)))
338 return AVERROR(ENOMEM);
339 memcpy(dtext->text, textbuf, textbuf_size);
340 dtext->text[textbuf_size] = 0;
341 av_file_unmap(textbuf, textbuf_size);
346 if (avpriv_init_smpte_timecode(ctx, &dtext->tc) < 0)
347 return AVERROR(EINVAL);
349 dtext->text = av_strdup("");
351 av_log(ctx, AV_LOG_ERROR,
352 "Timecode options are only available if libavfilter is built with libavcodec enabled.\n");
353 return AVERROR(EINVAL);
358 av_log(ctx, AV_LOG_ERROR,
359 "Either text, a valid file or a timecode must be provided\n");
360 return AVERROR(EINVAL);
363 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
364 av_log(ctx, AV_LOG_ERROR,
365 "Invalid font color '%s'\n", dtext->fontcolor_string);
369 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
370 av_log(ctx, AV_LOG_ERROR,
371 "Invalid box color '%s'\n", dtext->boxcolor_string);
375 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
376 av_log(ctx, AV_LOG_ERROR,
377 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
381 if ((err = FT_Init_FreeType(&(dtext->library)))) {
382 av_log(ctx, AV_LOG_ERROR,
383 "Could not load FreeType: %s\n", FT_ERRMSG(err));
384 return AVERROR(EINVAL);
387 /* load the face, and set up the encoding, which is by default UTF-8 */
388 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
389 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
390 dtext->fontfile, FT_ERRMSG(err));
391 return AVERROR(EINVAL);
393 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
394 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
395 dtext->fontsize, FT_ERRMSG(err));
396 return AVERROR(EINVAL);
399 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
401 /* load the fallback glyph with code 0 */
402 load_glyph(ctx, NULL, 0);
404 /* set the tabsize in pixels */
405 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
406 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
409 dtext->tabsize *= glyph->advance;
414 static int query_formats(AVFilterContext *ctx)
416 static const enum PixelFormat pix_fmts[] = {
417 PIX_FMT_ARGB, PIX_FMT_RGBA,
418 PIX_FMT_ABGR, PIX_FMT_BGRA,
419 PIX_FMT_RGB24, PIX_FMT_BGR24,
420 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
421 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
422 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
426 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
430 static int glyph_enu_free(void *opaque, void *elem)
436 static av_cold void uninit(AVFilterContext *ctx)
438 DrawTextContext *dtext = ctx->priv;
441 av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
442 av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
444 av_freep(&dtext->boxcolor_string);
445 av_freep(&dtext->expanded_text);
446 av_freep(&dtext->fontcolor_string);
447 av_freep(&dtext->fontfile);
448 av_freep(&dtext->shadowcolor_string);
449 av_freep(&dtext->text);
450 av_freep(&dtext->x_expr);
451 av_freep(&dtext->y_expr);
453 av_freep(&dtext->positions);
454 dtext->nb_positions = 0;
456 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
457 av_tree_destroy(dtext->glyphs);
458 dtext->glyphs = NULL;
460 FT_Done_Face(dtext->face);
461 FT_Done_FreeType(dtext->library);
463 for (i = 0; i < 4; i++) {
464 av_freep(&dtext->box_line[i]);
465 dtext->pixel_step[i] = 0;
469 static inline int is_newline(uint32_t c)
471 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
474 static int config_input(AVFilterLink *inlink)
476 AVFilterContext *ctx = inlink->dst;
477 DrawTextContext *dtext = ctx->priv;
478 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
481 dtext->hsub = pix_desc->log2_chroma_w;
482 dtext->vsub = pix_desc->log2_chroma_h;
485 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
486 inlink->w, dtext->boxcolor,
487 inlink->format, dtext->boxcolor_rgba,
488 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
491 if (!dtext->is_packed_rgb) {
492 uint8_t *rgba = dtext->fontcolor_rgba;
493 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
494 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
495 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
496 dtext->fontcolor[3] = rgba[3];
497 rgba = dtext->shadowcolor_rgba;
498 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
499 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
500 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
501 dtext->shadowcolor[3] = rgba[3];
504 dtext->var_values[VAR_w] = dtext->var_values[VAR_W] = dtext->var_values[VAR_MAIN_W] = inlink->w;
505 dtext->var_values[VAR_h] = dtext->var_values[VAR_H] = dtext->var_values[VAR_MAIN_H] = inlink->h;
506 dtext->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
507 dtext->var_values[VAR_DAR] = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
508 dtext->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
509 dtext->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
510 dtext->var_values[VAR_X] = NAN;
511 dtext->var_values[VAR_Y] = NAN;
513 dtext->var_values[VAR_N] = 0;
514 dtext->var_values[VAR_T] = NAN;
516 av_lfg_init(&dtext->prng, av_get_random_seed());
518 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
519 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
520 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
521 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
522 (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
523 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
525 return AVERROR(EINVAL);
530 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
532 DrawTextContext *dtext = ctx->priv;
534 if (!strcmp(cmd, "reinit")) {
538 if ((ret = init(ctx, arg, NULL)) < 0)
540 return config_input(ctx->inputs[0]);
543 return AVERROR(ENOSYS);
546 #define GET_BITMAP_VAL(r, c) \
547 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
548 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
549 bitmap->buffer[(r) * bitmap->pitch + (c)]
551 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
552 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
553 alpha = yuva_color[3] * (val) * 129; \
554 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
555 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
556 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
557 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
558 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
559 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
563 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
564 int x, int y, int width, int height,
565 const uint8_t yuva_color[4], int hsub, int vsub)
568 unsigned int luma_pos, chroma_pos1, chroma_pos2;
571 for (r = 0; r < bitmap->rows && r+y < height; r++) {
572 for (c = 0; c < bitmap->width && c+x < width; c++) {
573 if (c+x < 0 || r+y < 0)
576 /* get intensity value in the glyph bitmap (source) */
577 src_val = GET_BITMAP_VAL(r, c);
581 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
588 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
589 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
590 alpha = rgba_color[3] * (val) * 129; \
591 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
592 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
593 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
596 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
597 int x, int y, int width, int height, int pixel_step,
598 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
604 for (r = 0; r < bitmap->rows && r+y < height; r++) {
605 for (c = 0; c < bitmap->width && c+x < width; c++) {
606 if (c+x < 0 || r+y < 0)
608 /* get intensity value in the glyph bitmap (source) */
609 src_val = GET_BITMAP_VAL(r, c);
613 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
614 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
621 static inline void drawbox(AVFilterBufferRef *picref, int x, int y,
622 int width, int height,
623 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
624 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
628 if (color[3] != 0xFF) {
629 if (is_rgba_packed) {
631 for (j = 0; j < height; j++)
632 for (i = 0; i < width; i++)
633 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
634 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
636 unsigned int luma_pos, chroma_pos1, chroma_pos2;
637 for (j = 0; j < height; j++)
638 for (i = 0; i < width; i++)
639 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
642 ff_draw_rectangle(picref->data, picref->linesize,
643 line, pixel_step, hsub, vsub,
644 x, y, width, height);
648 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
649 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
651 char *text = dtext->expanded_text;
657 for (i = 0, p = text; *p; i++) {
659 GET_UTF8(code, *p++, continue;);
661 /* skip new line chars, just go to new line */
662 if (code == '\n' || code == '\r' || code == '\t')
666 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
668 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
669 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
670 return AVERROR(EINVAL);
672 x1 = dtext->positions[i].x+dtext->x+x;
673 y1 = dtext->positions[i].y+dtext->y+y;
675 if (dtext->is_packed_rgb) {
676 draw_glyph_rgb(picref, &glyph->bitmap,
677 x1, y1, width, height,
678 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
680 draw_glyph_yuv(picref, &glyph->bitmap,
681 x1, y1, width, height,
682 yuvcolor, dtext->hsub, dtext->vsub);
689 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
690 int width, int height)
692 DrawTextContext *dtext = ctx->priv;
693 uint32_t code = 0, prev_code = 0;
694 int x = 0, y = 0, i = 0, ret;
695 int max_text_line_w = 0, len;
697 char *text = dtext->text;
699 int y_min = 32000, y_max = -32000;
700 int x_min = 32000, x_max = -32000;
702 Glyph *glyph = NULL, *prev_glyph = NULL;
705 time_t now = time(0);
707 uint8_t *buf = dtext->expanded_text;
708 int buf_size = dtext->expanded_text_size;
710 if(dtext->basetime != AV_NOPTS_VALUE)
711 now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
714 buf_size = 2*strlen(dtext->text)+1;
715 buf = av_malloc(buf_size);
719 localtime_r(&now, <ime);
721 if(strchr(dtext->text, '%'))
722 ltime= *localtime(&now);
727 if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0)
730 } while ((buf = av_realloc(buf, buf_size)));
734 char tcbuf[sizeof("hh:mm:ss.ff")];
735 avpriv_timecode_to_string(tcbuf, &dtext->tc, dtext->frame_id++);
736 buf = av_asprintf("%s%s", dtext->text, tcbuf);
741 return AVERROR(ENOMEM);
742 text = dtext->expanded_text = buf;
743 dtext->expanded_text_size = buf_size;
744 if ((len = strlen(text)) > dtext->nb_positions) {
745 if (!(dtext->positions =
746 av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
747 return AVERROR(ENOMEM);
748 dtext->nb_positions = len;
754 /* load and cache glyphs */
755 for (i = 0, p = text; *p; i++) {
756 GET_UTF8(code, *p++, continue;);
760 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
762 load_glyph(ctx, &glyph, code);
764 y_min = FFMIN(glyph->bbox.yMin, y_min);
765 y_max = FFMAX(glyph->bbox.yMax, y_max);
766 x_min = FFMIN(glyph->bbox.xMin, x_min);
767 x_max = FFMAX(glyph->bbox.xMax, x_max);
769 dtext->max_glyph_h = y_max - y_min;
770 dtext->max_glyph_w = x_max - x_min;
772 /* compute and save position for each glyph */
774 for (i = 0, p = text; *p; i++) {
775 GET_UTF8(code, *p++, continue;);
777 /* skip the \n in the sequence \r\n */
778 if (prev_code == '\r' && code == '\n')
782 if (is_newline(code)) {
783 max_text_line_w = FFMAX(max_text_line_w, x);
784 y += dtext->max_glyph_h;
792 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
795 if (dtext->use_kerning && prev_glyph && glyph->code) {
796 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
797 ft_kerning_default, &delta);
802 dtext->positions[i].x = x + glyph->bitmap_left;
803 dtext->positions[i].y = y - glyph->bitmap_top + y_max;
804 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
805 else x += glyph->advance;
808 max_text_line_w = FFMAX(x, max_text_line_w);
810 dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
811 dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
813 dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
814 dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
815 dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
816 dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
818 dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
820 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
821 dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
822 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
823 dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
828 dtext->x &= ~((1 << dtext->hsub) - 1);
829 dtext->y &= ~((1 << dtext->vsub) - 1);
831 box_w = FFMIN(width - 1 , max_text_line_w);
832 box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
836 drawbox(picref, dtext->x, dtext->y, box_w, box_h,
837 dtext->box_line, dtext->pixel_step, dtext->is_packed_rgb ? dtext->boxcolor_rgba : dtext->boxcolor,
838 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
840 if (dtext->shadowx || dtext->shadowy) {
841 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
842 dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
846 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
847 dtext->fontcolor, 0, 0)) < 0)
853 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
855 static void end_frame(AVFilterLink *inlink)
857 AVFilterContext *ctx = inlink->dst;
858 AVFilterLink *outlink = ctx->outputs[0];
859 DrawTextContext *dtext = ctx->priv;
860 AVFilterBufferRef *picref = inlink->cur_buf;
862 dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
863 NAN : picref->pts * av_q2d(inlink->time_base);
865 draw_text(ctx, picref, picref->video->w, picref->video->h);
867 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
868 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
869 (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
872 dtext->var_values[VAR_N] += 1.0;
874 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
875 avfilter_end_frame(outlink);
878 AVFilter avfilter_vf_drawtext = {
880 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
881 .priv_size = sizeof(DrawTextContext),
884 .query_formats = query_formats,
886 .inputs = (const AVFilterPad[]) {{ .name = "default",
887 .type = AVMEDIA_TYPE_VIDEO,
888 .get_video_buffer = avfilter_null_get_video_buffer,
889 .start_frame = avfilter_null_start_frame,
890 .draw_slice = null_draw_slice,
891 .end_frame = end_frame,
892 .config_props = config_input,
893 .min_perms = AV_PERM_WRITE |
895 .rej_perms = AV_PERM_PRESERVE },
897 .outputs = (const AVFilterPad[]) {{ .name = "default",
898 .type = AVMEDIA_TYPE_VIDEO, },
900 .process_command = command,