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 FFmpeg vhook/drawtext.c
26 * filter by Gustavo Sverzut Barbieri
32 #include "libavutil/colorspace.h"
33 #include "libavutil/file.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/parseutils.h"
36 #include "libavutil/pixdesc.h"
37 #include "libavutil/tree.h"
39 #include "drawutils.h"
44 #include <freetype/config/ftheader.h>
45 #include FT_FREETYPE_H
50 uint8_t *fontfile; ///< font to be used
51 uint8_t *text; ///< text to be drawn
52 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
53 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
54 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
55 FT_Vector *positions; ///< positions for each element in the text
56 size_t nb_positions; ///< number of elements of positions array
57 char *textfile; ///< file with text to be drawn
58 unsigned int x; ///< x position to start drawing text
59 unsigned int y; ///< y position to start drawing text
61 unsigned int fontsize; ///< font size to use
62 char *fontcolor_string; ///< font color as string
63 char *boxcolor_string; ///< box color as string
64 char *shadowcolor_string; ///< shadow color as string
65 uint8_t fontcolor[4]; ///< foreground color
66 uint8_t boxcolor[4]; ///< background color
67 uint8_t shadowcolor[4]; ///< shadow color
68 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
69 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
70 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
72 short int draw_box; ///< draw box around text - true or false
73 int use_kerning; ///< font kerning is used - true/false
74 int tabsize; ///< tab size
76 FT_Library library; ///< freetype font library handle
77 FT_Face face; ///< freetype font face handle
78 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
79 int hsub, vsub; ///< chroma subsampling values
81 int pixel_step[4]; ///< distance in bytes between the component of each pixel
82 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
83 uint8_t *box_line[4]; ///< line used for filling the box background
84 int64_t basetime; ///< base pts time in the real world for display
87 #define OFFSET(x) offsetof(DrawTextContext, x)
89 static const AVOption drawtext_options[]= {
90 {"fontfile", "set font file", OFFSET(fontfile), FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
91 {"text", "set text", OFFSET(text), FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
92 {"textfile", "set text file", OFFSET(textfile), FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
93 {"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
94 {"boxcolor", "set box color", OFFSET(boxcolor_string), FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
95 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), FF_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
96 {"box", "set box", OFFSET(draw_box), FF_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
97 {"fontsize", "set font size", OFFSET(fontsize), FF_OPT_TYPE_INT, {.dbl=16}, 1, 72 },
98 {"x", "set x", OFFSET(x), FF_OPT_TYPE_INT, {.dbl=0}, 0, INT_MAX },
99 {"y", "set y", OFFSET(y), FF_OPT_TYPE_INT, {.dbl=0}, 0, INT_MAX },
100 {"shadowx", "set x", OFFSET(shadowx), FF_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
101 {"shadowy", "set y", OFFSET(shadowy), FF_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
102 {"tabsize", "set tab size", OFFSET(tabsize), FF_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
103 {"basetime", "set base time", OFFSET(basetime), FF_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX },
106 /* FT_LOAD_* flags */
107 {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), FF_OPT_TYPE_FLAGS, {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
108 {"default", "set default", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
109 {"no_scale", "set no_scale", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
110 {"no_hinting", "set no_hinting", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
111 {"render", "set render", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
112 {"no_bitmap", "set no_bitmap", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
113 {"vertical_layout", "set vertical_layout", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
114 {"force_autohint", "set force_autohint", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
115 {"crop_bitmap", "set crop_bitmap", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
116 {"pedantic", "set pedantic", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
117 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
118 {"no_recurse", "set no_recurse", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
119 {"ignore_transform", "set ignore_transform", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
120 {"monochrome", "set monochrome", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
121 {"linear_design", "set linear_design", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
122 {"no_autohint", "set no_autohint", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
126 static const char *drawtext_get_name(void *ctx)
131 static const AVClass drawtext_class = {
137 #undef __FTERRORS_H__
138 #define FT_ERROR_START_LIST {
139 #define FT_ERRORDEF(e, v, s) { (e), (s) },
140 #define FT_ERROR_END_LIST { 0, NULL } };
146 } static ft_errors[] =
149 #define FT_ERRMSG(e) ft_errors[e].err_msg
154 FT_Bitmap bitmap; ///< array holding bitmaps of font
161 static int glyph_cmp(void *key, const void *b)
163 const Glyph *a = key, *bb = b;
164 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
165 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
169 * Load glyphs corresponding to the UTF-32 codepoint code.
171 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
173 DrawTextContext *dtext = ctx->priv;
175 struct AVTreeNode *node = NULL;
178 /* load glyph into dtext->face->glyph */
179 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
180 return AVERROR(EINVAL);
183 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
184 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
185 ret = AVERROR(ENOMEM);
190 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
191 ret = AVERROR(EINVAL);
195 glyph->bitmap = dtext->face->glyph->bitmap;
196 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
197 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
198 glyph->advance = dtext->face->glyph->advance.x >> 6;
200 /* measure text height to calculate text_height (or the maximum text height) */
201 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
203 /* cache the newly created glyph */
204 if (!(node = av_mallocz(av_tree_node_size))) {
205 ret = AVERROR(ENOMEM);
208 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
216 av_freep(&glyph->glyph);
222 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
225 DrawTextContext *dtext = ctx->priv;
228 dtext->class = &drawtext_class;
229 av_opt_set_defaults(dtext);
230 dtext->fontcolor_string = av_strdup("black");
231 dtext->boxcolor_string = av_strdup("white");
232 dtext->shadowcolor_string = av_strdup("black");
234 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
235 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
239 if (!dtext->fontfile) {
240 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
241 return AVERROR(EINVAL);
244 if (dtext->textfile) {
249 av_log(ctx, AV_LOG_ERROR,
250 "Both text and text file provided. Please provide only one\n");
251 return AVERROR(EINVAL);
253 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
254 av_log(ctx, AV_LOG_ERROR,
255 "The text file '%s' could not be read or is empty\n",
260 if (!(dtext->text = av_malloc(textbuf_size+1)))
261 return AVERROR(ENOMEM);
262 memcpy(dtext->text, textbuf, textbuf_size);
263 dtext->text[textbuf_size] = 0;
264 av_file_unmap(textbuf, textbuf_size);
268 av_log(ctx, AV_LOG_ERROR,
269 "Either text or a valid file must be provided\n");
270 return AVERROR(EINVAL);
273 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
274 av_log(ctx, AV_LOG_ERROR,
275 "Invalid font color '%s'\n", dtext->fontcolor_string);
279 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
280 av_log(ctx, AV_LOG_ERROR,
281 "Invalid box color '%s'\n", dtext->boxcolor_string);
285 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
286 av_log(ctx, AV_LOG_ERROR,
287 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
291 if ((err = FT_Init_FreeType(&(dtext->library)))) {
292 av_log(ctx, AV_LOG_ERROR,
293 "Could not load FreeType: %s\n", FT_ERRMSG(err));
294 return AVERROR(EINVAL);
297 /* load the face, and set up the encoding, which is by default UTF-8 */
298 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
299 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
300 dtext->fontfile, FT_ERRMSG(err));
301 return AVERROR(EINVAL);
303 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
304 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
305 dtext->fontsize, FT_ERRMSG(err));
306 return AVERROR(EINVAL);
309 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
311 /* load the fallback glyph with code 0 */
312 load_glyph(ctx, NULL, 0);
314 /* set the tabsize in pixels */
315 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
316 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
319 dtext->tabsize *= glyph->advance;
324 static int query_formats(AVFilterContext *ctx)
326 static const enum PixelFormat pix_fmts[] = {
327 PIX_FMT_ARGB, PIX_FMT_RGBA,
328 PIX_FMT_ABGR, PIX_FMT_BGRA,
329 PIX_FMT_RGB24, PIX_FMT_BGR24,
330 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
331 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
332 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
336 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
340 static int glyph_enu_free(void *opaque, void *elem)
346 static av_cold void uninit(AVFilterContext *ctx)
348 DrawTextContext *dtext = ctx->priv;
351 av_freep(&dtext->fontfile);
352 av_freep(&dtext->text);
353 av_freep(&dtext->expanded_text);
354 av_freep(&dtext->fontcolor_string);
355 av_freep(&dtext->boxcolor_string);
356 av_freep(&dtext->positions);
357 dtext->nb_positions = 0;
358 av_freep(&dtext->shadowcolor_string);
359 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
360 av_tree_destroy(dtext->glyphs);
362 FT_Done_Face(dtext->face);
363 FT_Done_FreeType(dtext->library);
365 for (i = 0; i < 4; i++) {
366 av_freep(&dtext->box_line[i]);
367 dtext->pixel_step[i] = 0;
372 static int config_input(AVFilterLink *inlink)
374 DrawTextContext *dtext = inlink->dst->priv;
375 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
378 dtext->hsub = pix_desc->log2_chroma_w;
379 dtext->vsub = pix_desc->log2_chroma_h;
382 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
383 inlink->w, dtext->boxcolor,
384 inlink->format, dtext->boxcolor_rgba,
385 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
388 if (!dtext->is_packed_rgb) {
389 uint8_t *rgba = dtext->fontcolor_rgba;
390 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
391 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
392 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
393 dtext->fontcolor[3] = rgba[3];
394 rgba = dtext->shadowcolor_rgba;
395 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
396 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
397 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
398 dtext->shadowcolor[3] = rgba[3];
404 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
406 if(!strcmp(cmd, "reinit")){
409 if((ret=init(ctx, arg, NULL)) < 0)
411 return config_input(ctx->inputs[0]);
414 return AVERROR(ENOSYS);
417 #define GET_BITMAP_VAL(r, c) \
418 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
419 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
420 bitmap->buffer[(r) * bitmap->pitch + (c)]
422 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
423 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
424 alpha = yuva_color[3] * (val) * 129; \
425 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
426 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
427 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
428 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
429 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
430 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
434 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
435 unsigned int y, unsigned int width, unsigned int height,
436 const uint8_t yuva_color[4], int hsub, int vsub)
439 unsigned int luma_pos, chroma_pos1, chroma_pos2;
442 for (r = 0; r < bitmap->rows && r+y < height; r++) {
443 for (c = 0; c < bitmap->width && c+x < width; c++) {
444 /* get intensity value in the glyph bitmap (source) */
445 src_val = GET_BITMAP_VAL(r, c);
449 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
456 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
457 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
458 alpha = rgba_color[3] * (val) * 129; \
459 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
460 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
461 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
464 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
465 unsigned int x, unsigned int y,
466 unsigned int width, unsigned int height, int pixel_step,
467 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
473 for (r = 0; r < bitmap->rows && r+y < height; r++) {
474 for (c = 0; c < bitmap->width && c+x < width; c++) {
475 /* get intensity value in the glyph bitmap (source) */
476 src_val = GET_BITMAP_VAL(r, c);
480 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
481 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
488 static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
489 unsigned int width, unsigned int height,
490 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
491 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
495 if (color[3] != 0xFF) {
496 if (is_rgba_packed) {
498 for (j = 0; j < height; j++)
499 for (i = 0; i < width; i++)
500 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
501 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
503 unsigned int luma_pos, chroma_pos1, chroma_pos2;
504 for (j = 0; j < height; j++)
505 for (i = 0; i < width; i++)
506 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
509 ff_draw_rectangle(picref->data, picref->linesize,
510 line, pixel_step, hsub, vsub,
511 x, y, width, height);
515 static inline int is_newline(uint32_t c)
517 return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
520 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
521 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
523 char *text = dtext->expanded_text;
529 for (i = 0, p = text; *p; i++) {
531 GET_UTF8(code, *p++, continue;);
533 /* skip new line chars, just go to new line */
534 if (code == '\n' || code == '\r' || code == '\t')
538 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
540 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
541 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
542 return AVERROR(EINVAL);
544 if (dtext->is_packed_rgb) {
545 draw_glyph_rgb(picref, &glyph->bitmap,
546 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
547 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
549 draw_glyph_yuv(picref, &glyph->bitmap,
550 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
551 yuvcolor, dtext->hsub, dtext->vsub);
558 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
559 int width, int height)
561 DrawTextContext *dtext = ctx->priv;
562 uint32_t code = 0, prev_code = 0;
563 int x = 0, y = 0, i = 0, ret;
564 int text_height, baseline;
565 char *text = dtext->text;
568 int y_min = 32000, y_max = -32000;
570 Glyph *glyph = NULL, *prev_glyph = NULL;
573 time_t now = time(0);
575 uint8_t *buf = dtext->expanded_text;
576 int buf_size = dtext->expanded_text_size;
578 if(dtext->basetime != AV_NOPTS_VALUE)
579 now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
582 buf_size = 2*strlen(dtext->text)+1;
583 buf = av_malloc(buf_size);
587 localtime_r(&now, <ime);
589 if(strchr(dtext->text, '%'))
590 ltime= *localtime(&now);
595 if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0)
598 } while ((buf = av_realloc(buf, buf_size)));
601 return AVERROR(ENOMEM);
602 text = dtext->expanded_text = buf;
603 dtext->expanded_text_size = buf_size;
604 if ((len = strlen(text)) > dtext->nb_positions) {
605 if (!(dtext->positions =
606 av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
607 return AVERROR(ENOMEM);
608 dtext->nb_positions = len;
614 /* load and cache glyphs */
615 for (i = 0, p = text; *p; i++) {
616 GET_UTF8(code, *p++, continue;);
620 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
622 load_glyph(ctx, &glyph, code);
624 y_min = FFMIN(glyph->bbox.yMin, y_min);
625 y_max = FFMAX(glyph->bbox.yMax, y_max);
627 text_height = y_max - y_min;
630 /* compute and save position for each glyph */
632 for (i = 0, p = text; *p; i++) {
633 GET_UTF8(code, *p++, continue;);
635 /* skip the \n in the sequence \r\n */
636 if (prev_code == '\r' && code == '\n')
640 if (is_newline(code)) {
641 str_w = FFMAX(str_w, x - dtext->x);
650 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
653 if (dtext->use_kerning && prev_glyph && glyph->code) {
654 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
655 ft_kerning_default, &delta);
659 if (x + glyph->bbox.xMax >= width) {
660 str_w = FFMAX(str_w, x - dtext->x);
666 dtext->positions[i].x = x + glyph->bitmap_left;
667 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
668 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
669 else x += glyph->advance;
672 str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));
673 y = FFMIN(y + text_height, height - 1);
677 drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,
678 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
679 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
681 if (dtext->shadowx || dtext->shadowy) {
682 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
683 dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
687 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
688 dtext->fontcolor, 0, 0)) < 0)
694 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
696 static void end_frame(AVFilterLink *inlink)
698 AVFilterLink *outlink = inlink->dst->outputs[0];
699 AVFilterBufferRef *picref = inlink->cur_buf;
701 draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
703 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
704 avfilter_end_frame(outlink);
707 AVFilter avfilter_vf_drawtext = {
709 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
710 .priv_size = sizeof(DrawTextContext),
713 .query_formats = query_formats,
715 .inputs = (AVFilterPad[]) {{ .name = "default",
716 .type = AVMEDIA_TYPE_VIDEO,
717 .get_video_buffer = avfilter_null_get_video_buffer,
718 .start_frame = avfilter_null_start_frame,
719 .draw_slice = null_draw_slice,
720 .end_frame = end_frame,
721 .config_props = config_input,
722 .min_perms = AV_PERM_WRITE |
724 .rej_perms = AV_PERM_PRESERVE },
726 .outputs = (AVFilterPad[]) {{ .name = "default",
727 .type = AVMEDIA_TYPE_VIDEO, },
729 .process_command = command,