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 *text_priv; ///< used to detect whether text changed
53 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
54 FT_Vector *positions; ///< positions for each element in the text
55 char *textfile; ///< file with text to be drawn
56 unsigned int x; ///< x position to start drawing text
57 unsigned int y; ///< y position to start drawing text
58 unsigned int fontsize; ///< font size to use
59 char *fontcolor_string; ///< font color as string
60 char *boxcolor_string; ///< box color as string
61 uint8_t fontcolor[4]; ///< foreground color
62 uint8_t boxcolor[4]; ///< background color
63 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
64 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
66 short int draw_box; ///< draw box around text - true or false
67 int use_kerning; ///< font kerning is used - true/false
68 int tabsize; ///< tab size
70 FT_Library library; ///< freetype font library handle
71 FT_Face face; ///< freetype font face handle
72 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
73 int hsub, vsub; ///< chroma subsampling values
75 int pixel_step[4]; ///< distance in bytes between the component of each pixel
76 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
77 uint8_t *box_line[4]; ///< line used for filling the box background
80 #define OFFSET(x) offsetof(DrawTextContext, x)
82 static const AVOption drawtext_options[]= {
83 {"fontfile", "set font file", OFFSET(fontfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
84 {"text", "set text", OFFSET(text), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
85 {"textfile", "set text file", OFFSET(textfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
86 {"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
87 {"boxcolor", "set box color", OFFSET(boxcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
88 {"box", "set box", OFFSET(draw_box), FF_OPT_TYPE_INT, 0, 0, 1 },
89 {"fontsize", "set font size", OFFSET(fontsize), FF_OPT_TYPE_INT, 16, 1, 72 },
90 {"x", "set x", OFFSET(x), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
91 {"y", "set y", OFFSET(y), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
92 {"tabsize", "set tab size", OFFSET(tabsize), FF_OPT_TYPE_INT, 4, 0, INT_MAX },
95 {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), FF_OPT_TYPE_FLAGS, FT_LOAD_DEFAULT|FT_LOAD_RENDER, 0, INT_MAX, 0, "ft_load_flags" },
96 {"default", "set default", 0, FF_OPT_TYPE_CONST, FT_LOAD_DEFAULT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
97 {"no_scale", "set no_scale", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_SCALE, INT_MIN, INT_MAX, 0, "ft_load_flags" },
98 {"no_hinting", "set no_hinting", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_HINTING, INT_MIN, INT_MAX, 0, "ft_load_flags" },
99 {"render", "set render", 0, FF_OPT_TYPE_CONST, FT_LOAD_RENDER, INT_MIN, INT_MAX, 0, "ft_load_flags" },
100 {"no_bitmap", "set no_bitmap", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_BITMAP, INT_MIN, INT_MAX, 0, "ft_load_flags" },
101 {"vertical_layout", "set vertical_layout", 0, FF_OPT_TYPE_CONST, FT_LOAD_VERTICAL_LAYOUT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
102 {"force_autohint", "set force_autohint", 0, FF_OPT_TYPE_CONST, FT_LOAD_FORCE_AUTOHINT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
103 {"crop_bitmap", "set crop_bitmap", 0, FF_OPT_TYPE_CONST, FT_LOAD_CROP_BITMAP, INT_MIN, INT_MAX, 0, "ft_load_flags" },
104 {"pedantic", "set pedantic", 0, FF_OPT_TYPE_CONST, FT_LOAD_PEDANTIC, INT_MIN, INT_MAX, 0, "ft_load_flags" },
105 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH, INT_MIN, INT_MAX, 0, "ft_load_flags" },
106 {"no_recurse", "set no_recurse", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_RECURSE, INT_MIN, INT_MAX, 0, "ft_load_flags" },
107 {"ignore_transform", "set ignore_transform", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_TRANSFORM, INT_MIN, INT_MAX, 0, "ft_load_flags" },
108 {"monochrome", "set monochrome", 0, FF_OPT_TYPE_CONST, FT_LOAD_MONOCHROME, INT_MIN, INT_MAX, 0, "ft_load_flags" },
109 {"linear_design", "set linear_design", 0, FF_OPT_TYPE_CONST, FT_LOAD_LINEAR_DESIGN, INT_MIN, INT_MAX, 0, "ft_load_flags" },
110 {"no_autohint", "set no_autohint", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_AUTOHINT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
114 static const char *drawtext_get_name(void *ctx)
119 static const AVClass drawtext_class = {
125 #undef __FTERRORS_H__
126 #define FT_ERROR_START_LIST {
127 #define FT_ERRORDEF(e, v, s) { (e), (s) },
128 #define FT_ERROR_END_LIST { 0, NULL } };
134 } static ft_errors[] =
137 #define FT_ERRMSG(e) ft_errors[e].err_msg
142 FT_Bitmap bitmap; ///< array holding bitmaps of font
149 static int glyph_cmp(void *key, const void *b)
151 const Glyph *a = key, *bb = b;
152 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
153 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
157 * Load glyphs corresponding to the UTF-32 codepoint code.
159 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
161 DrawTextContext *dtext = ctx->priv;
163 struct AVTreeNode *node = NULL;
166 /* load glyph into dtext->face->glyph */
167 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
168 return AVERROR(EINVAL);
171 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
172 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
173 ret = AVERROR(ENOMEM);
178 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
179 ret = AVERROR(EINVAL);
183 glyph->bitmap = dtext->face->glyph->bitmap;
184 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
185 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
186 glyph->advance = dtext->face->glyph->advance.x >> 6;
188 /* measure text height to calculate text_height (or the maximum text height) */
189 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
191 /* cache the newly created glyph */
192 if (!(node = av_mallocz(av_tree_node_size))) {
193 ret = AVERROR(ENOMEM);
196 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
204 av_freep(&glyph->glyph);
210 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
213 DrawTextContext *dtext = ctx->priv;
216 dtext->class = &drawtext_class;
217 av_opt_set_defaults2(dtext, 0, 0);
218 dtext->fontcolor_string = av_strdup("black");
219 dtext->boxcolor_string = av_strdup("white");
221 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
222 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
226 if (!dtext->fontfile) {
227 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
228 return AVERROR(EINVAL);
231 if (dtext->textfile) {
236 av_log(ctx, AV_LOG_ERROR,
237 "Both text and text file provided. Please provide only one\n");
238 return AVERROR(EINVAL);
240 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
241 av_log(ctx, AV_LOG_ERROR,
242 "The text file '%s' could not be read or is empty\n",
247 if (!(dtext->text = av_malloc(textbuf_size+1)))
248 return AVERROR(ENOMEM);
249 memcpy(dtext->text, textbuf, textbuf_size);
250 dtext->text[textbuf_size] = 0;
251 av_file_unmap(textbuf, textbuf_size);
255 av_log(ctx, AV_LOG_ERROR,
256 "Either text or a valid file must be provided\n");
257 return AVERROR(EINVAL);
260 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
261 av_log(ctx, AV_LOG_ERROR,
262 "Invalid font color '%s'\n", dtext->fontcolor_string);
266 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
267 av_log(ctx, AV_LOG_ERROR,
268 "Invalid box color '%s'\n", dtext->boxcolor_string);
272 if ((err = FT_Init_FreeType(&(dtext->library)))) {
273 av_log(ctx, AV_LOG_ERROR,
274 "Could not load FreeType: %s\n", FT_ERRMSG(err));
275 return AVERROR(EINVAL);
278 /* load the face, and set up the encoding, which is by default UTF-8 */
279 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
280 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
281 dtext->fontfile, FT_ERRMSG(err));
282 return AVERROR(EINVAL);
284 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
285 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
286 dtext->fontsize, FT_ERRMSG(err));
287 return AVERROR(EINVAL);
290 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
292 /* load the fallback glyph with code 0 */
293 load_glyph(ctx, NULL, 0);
295 /* set the tabsize in pixels */
296 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
297 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
300 dtext->tabsize *= glyph->advance;
302 #if !HAVE_LOCALTIME_R
303 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
309 static int query_formats(AVFilterContext *ctx)
311 static const enum PixelFormat pix_fmts[] = {
312 PIX_FMT_ARGB, PIX_FMT_RGBA,
313 PIX_FMT_ABGR, PIX_FMT_BGRA,
314 PIX_FMT_RGB24, PIX_FMT_BGR24,
315 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
316 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
317 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
321 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
325 static int glyph_enu_free(void *opaque, void *elem)
331 static av_cold void uninit(AVFilterContext *ctx)
333 DrawTextContext *dtext = ctx->priv;
336 av_freep(&dtext->fontfile);
337 av_freep(&dtext->text);
338 av_freep(&dtext->fontcolor_string);
339 av_freep(&dtext->boxcolor_string);
340 av_freep(&dtext->positions);
341 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
342 av_tree_destroy(dtext->glyphs);
344 FT_Done_Face(dtext->face);
345 FT_Done_FreeType(dtext->library);
347 for (i = 0; i < 4; i++) {
348 av_freep(&dtext->box_line[i]);
349 dtext->pixel_step[i] = 0;
354 static int config_input(AVFilterLink *inlink)
356 DrawTextContext *dtext = inlink->dst->priv;
357 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
360 dtext->hsub = pix_desc->log2_chroma_w;
361 dtext->vsub = pix_desc->log2_chroma_h;
364 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
365 inlink->w, dtext->boxcolor,
366 inlink->format, dtext->boxcolor_rgba,
367 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
370 if (!dtext->is_packed_rgb) {
371 uint8_t *rgba = dtext->fontcolor_rgba;
372 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
373 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
374 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
375 dtext->fontcolor[3] = rgba[3];
381 #define GET_BITMAP_VAL(r, c) \
382 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
383 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
384 bitmap->buffer[(r) * bitmap->pitch + (c)]
386 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
387 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
388 alpha = yuva_color[3] * (val) * 129; \
389 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
390 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
391 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
392 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
393 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
394 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
398 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
399 unsigned int y, unsigned int width, unsigned int height,
400 const uint8_t yuva_color[4], int hsub, int vsub)
403 unsigned int luma_pos, chroma_pos1, chroma_pos2;
404 uint8_t src_val, dst_pixel[4];
406 for (r = 0; r < bitmap->rows && r+y < height; r++) {
407 for (c = 0; c < bitmap->width && c+x < width; c++) {
408 /* get pixel in the picref (destination) */
409 dst_pixel[0] = picref->data[0][ c+x + (y+r) * picref->linesize[0]];
410 dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];
411 dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];
413 /* get intensity value in the glyph bitmap (source) */
414 src_val = GET_BITMAP_VAL(r, c);
418 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
425 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
426 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
427 alpha = rgba_color[3] * (val) * 129; \
428 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
429 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
430 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
433 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
434 unsigned int x, unsigned int y,
435 unsigned int width, unsigned int height, int pixel_step,
436 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
440 uint8_t src_val, dst_pixel[4];
442 for (r = 0; r < bitmap->rows && r+y < height; r++) {
443 for (c = 0; c < bitmap->width && c+x < width; c++) {
444 /* get pixel in the picref (destination) */
445 dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +
446 (y+r) * picref->linesize[0]];
447 dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +
448 (y+r) * picref->linesize[0]];
449 dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +
450 (y+r) * picref->linesize[0]];
452 /* get intensity value in the glyph bitmap (source) */
453 src_val = GET_BITMAP_VAL(r, c);
457 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
458 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
465 static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
466 unsigned int width, unsigned int height,
467 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
468 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
472 if (color[3] != 0xFF) {
473 if (is_rgba_packed) {
475 for (j = 0; j < height; j++)
476 for (i = 0; i < width; i++)
477 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
478 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
480 unsigned int luma_pos, chroma_pos1, chroma_pos2;
481 for (j = 0; j < height; j++)
482 for (i = 0; i < width; i++)
483 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
486 ff_draw_rectangle(picref->data, picref->linesize,
487 line, pixel_step, hsub, vsub,
488 x, y, width, height);
492 static inline int is_newline(uint32_t c)
494 return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
497 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
498 int width, int height)
500 DrawTextContext *dtext = ctx->priv;
501 uint32_t code = 0, prev_code = 0;
502 int x = 0, y = 0, i = 0;
503 int text_height, baseline;
506 int y_min = 32000, y_max = -32000;
508 Glyph *glyph = NULL, *prev_glyph = NULL;
511 if (dtext->text != dtext->text_priv) {
513 time_t now = time(0);
516 int buflen = 2*strlen(dtext->text) + 1, len;
518 localtime_r(&now, <ime);
520 while ((buf = av_realloc(buf, buflen))) {
522 if ((len = strftime(buf, buflen, dtext->text, <ime)) != 0 || *buf == 0)
527 return AVERROR(ENOMEM);
528 av_freep(&dtext->text);
529 dtext->text = dtext->text_priv = buf;
531 dtext->text_priv = dtext->text;
533 if (!(dtext->positions = av_realloc(dtext->positions,
534 strlen(dtext->text)*sizeof(*dtext->positions))))
535 return AVERROR(ENOMEM);
541 /* load and cache glyphs */
542 for (i = 0, p = dtext->text; *p; i++) {
543 GET_UTF8(code, *p++, continue;);
547 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
549 load_glyph(ctx, &glyph, code);
551 y_min = FFMIN(glyph->bbox.yMin, y_min);
552 y_max = FFMAX(glyph->bbox.yMax, y_max);
554 text_height = y_max - y_min;
557 /* compute and save position for each glyph */
559 for (i = 0, p = dtext->text; *p; i++) {
560 GET_UTF8(code, *p++, continue;);
562 /* skip the \n in the sequence \r\n */
563 if (prev_code == '\r' && code == '\n')
567 if (is_newline(code)) {
568 str_w = FFMAX(str_w, x - dtext->x);
577 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
580 if (dtext->use_kerning && prev_glyph && glyph->code) {
581 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
582 ft_kerning_default, &delta);
586 if (x + glyph->bbox.xMax >= width) {
587 str_w = FFMAX(str_w, x - dtext->x);
593 dtext->positions[i].x = x + glyph->bitmap_left;
594 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
595 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
596 else x += glyph->advance;
599 str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));
600 y = FFMIN(y + text_height, height - 1);
604 drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,
605 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
606 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
609 for (i = 0, p = dtext->text; *p; i++) {
611 GET_UTF8(code, *p++, continue;);
613 /* skip new line chars, just go to new line */
614 if (is_newline(code) || code == ' ' || code == '\t')
618 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
620 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
621 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
622 return AVERROR(EINVAL);
624 if (dtext->is_packed_rgb) {
625 draw_glyph_rgb(picref, &glyph->bitmap,
626 dtext->positions[i].x, dtext->positions[i].y, width, height,
627 dtext->pixel_step[0], dtext->fontcolor_rgba, dtext->rgba_map);
629 draw_glyph_yuv(picref, &glyph->bitmap,
630 dtext->positions[i].x, dtext->positions[i].y, width, height,
631 dtext->fontcolor, dtext->hsub, dtext->vsub);
638 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
640 static void end_frame(AVFilterLink *inlink)
642 AVFilterLink *outlink = inlink->dst->outputs[0];
643 AVFilterBufferRef *picref = inlink->cur_buf;
645 draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
647 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
648 avfilter_end_frame(outlink);
651 AVFilter avfilter_vf_drawtext = {
653 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
654 .priv_size = sizeof(DrawTextContext),
657 .query_formats = query_formats,
659 .inputs = (AVFilterPad[]) {{ .name = "default",
660 .type = AVMEDIA_TYPE_VIDEO,
661 .get_video_buffer = avfilter_null_get_video_buffer,
662 .start_frame = avfilter_null_start_frame,
663 .draw_slice = null_draw_slice,
664 .end_frame = end_frame,
665 .config_props = config_input,
666 .min_perms = AV_PERM_WRITE |
668 .rej_perms = AV_PERM_PRESERVE },
670 .outputs = (AVFilterPad[]) {{ .name = "default",
671 .type = AVMEDIA_TYPE_VIDEO, },