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/eval.h"
34 #include "libavutil/file.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/parseutils.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavutil/tree.h"
40 #include "drawutils.h"
45 #include <freetype/config/ftheader.h>
46 #include FT_FREETYPE_H
49 static const char * const var_names[] = {
50 "w", ///< width of the input video
51 "h", ///< height of the input video
52 "tw", "text_w", ///< width of the rendered text
53 "th", "text_h", ///< height of the rendered text
54 "max_glyph_w", ///< max glyph width
55 "max_glyph_h", ///< max glyph height
56 "max_glyph_a", "ascent", ///< max glyph ascent
57 "max_glyph_d", "descent", ///< min glyph descent
58 "line_h", "lh", ///< line height, same as max_glyph_h
65 "n", ///< number of frame
66 "t", ///< timestamp expressed in seconds
77 VAR_MAX_GLYPH_A, VAR_ASCENT,
78 VAR_MAX_GLYPH_D, VAR_DESCENT,
93 int reinit; ///< tells if the filter is being reinited
94 uint8_t *fontfile; ///< font to be used
95 uint8_t *text; ///< text to be drawn
96 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
97 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
98 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
99 FT_Vector *positions; ///< positions for each element in the text
100 size_t nb_positions; ///< number of elements of positions array
101 char *textfile; ///< file with text to be drawn
102 int x; ///< x position to start drawing text
103 int y; ///< y position to start drawing text
104 char *x_expr; ///< expression for x position
105 char *y_expr; ///< expression for y position
106 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
107 int max_glyph_w; ///< max glyph width
108 int max_glyph_h; ///< max glyph heigth
109 int shadowx, shadowy;
110 unsigned int fontsize; ///< font size to use
111 char *fontcolor_string; ///< font color as string
112 char *boxcolor_string; ///< box color as string
113 char *shadowcolor_string; ///< shadow color as string
114 uint8_t fontcolor[4]; ///< foreground color
115 uint8_t boxcolor[4]; ///< background color
116 uint8_t shadowcolor[4]; ///< shadow color
117 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
118 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
119 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
121 short int draw_box; ///< draw box around text - true or false
122 int use_kerning; ///< font kerning is used - true/false
123 int tabsize; ///< tab size
125 FT_Library library; ///< freetype font library handle
126 FT_Face face; ///< freetype font face handle
127 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
128 int hsub, vsub; ///< chroma subsampling values
130 int pixel_step[4]; ///< distance in bytes between the component of each pixel
131 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
132 uint8_t *box_line[4]; ///< line used for filling the box background
133 int64_t basetime; ///< base pts time in the real world for display
134 double var_values[VAR_VARS_NB];
137 #define OFFSET(x) offsetof(DrawTextContext, x)
139 static const AVOption drawtext_options[]= {
140 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
141 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
142 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
143 {"fontcolor", "set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
144 {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
145 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
146 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
147 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, INT_MAX },
148 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
149 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
150 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
151 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
152 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
153 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX },
156 /* FT_LOAD_* flags */
157 {"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" },
158 {"default", "set default", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
159 {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
160 {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
161 {"render", "set render", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
162 {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
163 {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
164 {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
165 {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
166 {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
167 {"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" },
168 {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
169 {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
170 {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
171 {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
172 {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
176 static const char *drawtext_get_name(void *ctx)
181 static const AVClass drawtext_class = {
187 #undef __FTERRORS_H__
188 #define FT_ERROR_START_LIST {
189 #define FT_ERRORDEF(e, v, s) { (e), (s) },
190 #define FT_ERROR_END_LIST { 0, NULL } };
196 } static ft_errors[] =
199 #define FT_ERRMSG(e) ft_errors[e].err_msg
204 FT_Bitmap bitmap; ///< array holding bitmaps of font
211 static int glyph_cmp(void *key, const void *b)
213 const Glyph *a = key, *bb = b;
214 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
215 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
219 * Load glyphs corresponding to the UTF-32 codepoint code.
221 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
223 DrawTextContext *dtext = ctx->priv;
225 struct AVTreeNode *node = NULL;
228 /* load glyph into dtext->face->glyph */
229 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
230 return AVERROR(EINVAL);
233 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
234 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
235 ret = AVERROR(ENOMEM);
240 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
241 ret = AVERROR(EINVAL);
245 glyph->bitmap = dtext->face->glyph->bitmap;
246 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
247 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
248 glyph->advance = dtext->face->glyph->advance.x >> 6;
250 /* measure text height to calculate text_height (or the maximum text height) */
251 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
253 /* cache the newly created glyph */
254 if (!(node = av_mallocz(av_tree_node_size))) {
255 ret = AVERROR(ENOMEM);
258 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
266 av_freep(&glyph->glyph);
272 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
275 DrawTextContext *dtext = ctx->priv;
278 dtext->class = &drawtext_class;
279 av_opt_set_defaults(dtext);
281 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
282 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
286 if (!dtext->fontfile) {
287 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
288 return AVERROR(EINVAL);
291 if (dtext->textfile) {
296 av_log(ctx, AV_LOG_ERROR,
297 "Both text and text file provided. Please provide only one\n");
298 return AVERROR(EINVAL);
300 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
301 av_log(ctx, AV_LOG_ERROR,
302 "The text file '%s' could not be read or is empty\n",
307 if (!(dtext->text = av_malloc(textbuf_size+1)))
308 return AVERROR(ENOMEM);
309 memcpy(dtext->text, textbuf, textbuf_size);
310 dtext->text[textbuf_size] = 0;
311 av_file_unmap(textbuf, textbuf_size);
315 av_log(ctx, AV_LOG_ERROR,
316 "Either text or a valid file must be provided\n");
317 return AVERROR(EINVAL);
320 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
321 av_log(ctx, AV_LOG_ERROR,
322 "Invalid font color '%s'\n", dtext->fontcolor_string);
326 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
327 av_log(ctx, AV_LOG_ERROR,
328 "Invalid box color '%s'\n", dtext->boxcolor_string);
332 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
333 av_log(ctx, AV_LOG_ERROR,
334 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
338 if ((err = FT_Init_FreeType(&(dtext->library)))) {
339 av_log(ctx, AV_LOG_ERROR,
340 "Could not load FreeType: %s\n", FT_ERRMSG(err));
341 return AVERROR(EINVAL);
344 /* load the face, and set up the encoding, which is by default UTF-8 */
345 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
346 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
347 dtext->fontfile, FT_ERRMSG(err));
348 return AVERROR(EINVAL);
350 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
351 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
352 dtext->fontsize, FT_ERRMSG(err));
353 return AVERROR(EINVAL);
356 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
358 /* load the fallback glyph with code 0 */
359 load_glyph(ctx, NULL, 0);
361 /* set the tabsize in pixels */
362 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
363 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
366 dtext->tabsize *= glyph->advance;
371 static int query_formats(AVFilterContext *ctx)
373 static const enum PixelFormat pix_fmts[] = {
374 PIX_FMT_ARGB, PIX_FMT_RGBA,
375 PIX_FMT_ABGR, PIX_FMT_BGRA,
376 PIX_FMT_RGB24, PIX_FMT_BGR24,
377 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
378 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
379 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
383 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
387 static int glyph_enu_free(void *opaque, void *elem)
393 static av_cold void uninit(AVFilterContext *ctx)
395 DrawTextContext *dtext = ctx->priv;
398 av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
399 av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
401 av_freep(&dtext->boxcolor_string);
402 av_freep(&dtext->expanded_text);
403 av_freep(&dtext->fontcolor_string);
404 av_freep(&dtext->fontfile);
405 av_freep(&dtext->shadowcolor_string);
406 av_freep(&dtext->text);
407 av_freep(&dtext->x_expr);
408 av_freep(&dtext->y_expr);
410 av_freep(&dtext->positions);
411 dtext->nb_positions = 0;
413 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
414 av_tree_destroy(dtext->glyphs);
415 dtext->glyphs = NULL;
417 FT_Done_Face(dtext->face);
418 FT_Done_FreeType(dtext->library);
420 for (i = 0; i < 4; i++) {
421 av_freep(&dtext->box_line[i]);
422 dtext->pixel_step[i] = 0;
426 static int config_input(AVFilterLink *inlink)
428 AVFilterContext *ctx = inlink->dst;
429 DrawTextContext *dtext = inlink->dst->priv;
430 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
433 dtext->hsub = pix_desc->log2_chroma_w;
434 dtext->vsub = pix_desc->log2_chroma_h;
437 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
438 inlink->w, dtext->boxcolor,
439 inlink->format, dtext->boxcolor_rgba,
440 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
443 if (!dtext->is_packed_rgb) {
444 uint8_t *rgba = dtext->fontcolor_rgba;
445 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
446 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
447 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
448 dtext->fontcolor[3] = rgba[3];
449 rgba = dtext->shadowcolor_rgba;
450 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
451 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
452 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
453 dtext->shadowcolor[3] = rgba[3];
456 dtext->var_values[VAR_W] = inlink->w;
457 dtext->var_values[VAR_H] = inlink->h;
458 dtext->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
459 dtext->var_values[VAR_DAR] = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
460 dtext->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
461 dtext->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
462 dtext->var_values[VAR_X] = NAN;
463 dtext->var_values[VAR_Y] = NAN;
465 dtext->var_values[VAR_N] = 0;
466 dtext->var_values[VAR_T] = NAN;
468 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
469 NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
470 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
471 NULL, NULL, NULL, NULL, 0, ctx)) < 0)
472 return AVERROR(EINVAL);
477 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
479 DrawTextContext *dtext = ctx->priv;
481 if (!strcmp(cmd, "reinit")) {
485 if ((ret = init(ctx, arg, NULL)) < 0)
487 return config_input(ctx->inputs[0]);
490 return AVERROR(ENOSYS);
493 #define GET_BITMAP_VAL(r, c) \
494 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
495 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
496 bitmap->buffer[(r) * bitmap->pitch + (c)]
498 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
499 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
500 alpha = yuva_color[3] * (val) * 129; \
501 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
502 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
503 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
504 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
505 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
506 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
510 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
511 int x, int y, int width, int height,
512 const uint8_t yuva_color[4], int hsub, int vsub)
515 unsigned int luma_pos, chroma_pos1, chroma_pos2;
518 for (r = 0; r < bitmap->rows && r+y < height; r++) {
519 for (c = 0; c < bitmap->width && c+x < width; c++) {
520 if (c+x < 0 || r+y < 0)
523 /* get intensity value in the glyph bitmap (source) */
524 src_val = GET_BITMAP_VAL(r, c);
528 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
535 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
536 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
537 alpha = rgba_color[3] * (val) * 129; \
538 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
539 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
540 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
543 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
544 int x, int y, int width, int height, int pixel_step,
545 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
551 for (r = 0; r < bitmap->rows && r+y < height; r++) {
552 for (c = 0; c < bitmap->width && c+x < width; c++) {
553 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_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
561 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
568 static inline void drawbox(AVFilterBufferRef *picref, int x, int y,
569 int width, int height,
570 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
571 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
575 if (color[3] != 0xFF) {
576 if (is_rgba_packed) {
578 for (j = 0; j < height; j++)
579 for (i = 0; i < width; i++)
580 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
581 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
583 unsigned int luma_pos, chroma_pos1, chroma_pos2;
584 for (j = 0; j < height; j++)
585 for (i = 0; i < width; i++)
586 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
589 ff_draw_rectangle(picref->data, picref->linesize,
590 line, pixel_step, hsub, vsub,
591 x, y, width, height);
595 static inline int is_newline(uint32_t c)
597 return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
600 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
601 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
603 char *text = dtext->expanded_text;
609 for (i = 0, p = text; *p; i++) {
611 GET_UTF8(code, *p++, continue;);
613 /* skip new line chars, just go to new line */
614 if (code == '\n' || code == '\r' || code == '\t')
618 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)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 x1 = dtext->positions[i].x+dtext->x+x;
625 y1 = dtext->positions[i].y+dtext->y+y;
627 if (dtext->is_packed_rgb) {
628 draw_glyph_rgb(picref, &glyph->bitmap,
629 x1, y1, width, height,
630 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
632 draw_glyph_yuv(picref, &glyph->bitmap,
633 x1, y1, width, height,
634 yuvcolor, dtext->hsub, dtext->vsub);
641 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
642 int width, int height)
644 DrawTextContext *dtext = ctx->priv;
645 uint32_t code = 0, prev_code = 0;
646 int x = 0, y = 0, i = 0, ret;
647 int max_text_line_w = 0, len;
649 char *text = dtext->text;
651 int y_min = 32000, y_max = -32000;
652 int x_min = 32000, x_max = -32000;
654 Glyph *glyph = NULL, *prev_glyph = NULL;
657 time_t now = time(0);
659 uint8_t *buf = dtext->expanded_text;
660 int buf_size = dtext->expanded_text_size;
662 if(dtext->basetime != AV_NOPTS_VALUE)
663 now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
666 buf_size = 2*strlen(dtext->text)+1;
667 buf = av_malloc(buf_size);
671 localtime_r(&now, <ime);
673 if(strchr(dtext->text, '%'))
674 ltime= *localtime(&now);
679 if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0)
682 } while ((buf = av_realloc(buf, buf_size)));
685 return AVERROR(ENOMEM);
686 text = dtext->expanded_text = buf;
687 dtext->expanded_text_size = buf_size;
688 if ((len = strlen(text)) > dtext->nb_positions) {
689 if (!(dtext->positions =
690 av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
691 return AVERROR(ENOMEM);
692 dtext->nb_positions = len;
698 /* load and cache glyphs */
699 for (i = 0, p = text; *p; i++) {
700 GET_UTF8(code, *p++, continue;);
704 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
706 load_glyph(ctx, &glyph, code);
708 y_min = FFMIN(glyph->bbox.yMin, y_min);
709 y_max = FFMAX(glyph->bbox.yMax, y_max);
710 x_min = FFMIN(glyph->bbox.xMin, x_min);
711 x_max = FFMAX(glyph->bbox.xMax, x_max);
713 dtext->max_glyph_h = y_max - y_min;
714 dtext->max_glyph_w = x_max - x_min;
716 /* compute and save position for each glyph */
718 for (i = 0, p = text; *p; i++) {
719 GET_UTF8(code, *p++, continue;);
721 /* skip the \n in the sequence \r\n */
722 if (prev_code == '\r' && code == '\n')
726 if (is_newline(code)) {
727 max_text_line_w = FFMAX(max_text_line_w, x);
728 y += dtext->max_glyph_h;
736 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
739 if (dtext->use_kerning && prev_glyph && glyph->code) {
740 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
741 ft_kerning_default, &delta);
746 dtext->positions[i].x = x + glyph->bitmap_left;
747 dtext->positions[i].y = y - glyph->bitmap_top + y_max;
748 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
749 else x += glyph->advance;
752 max_text_line_w = FFMAX(x, max_text_line_w);
754 dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
755 dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
757 dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
758 dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
759 dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
760 dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
762 dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
764 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, NULL);
765 dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, NULL);
766 dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, NULL);
768 dtext->x &= ~((1 << dtext->hsub) - 1);
769 dtext->y &= ~((1 << dtext->vsub) - 1);
771 box_w = FFMIN(width - 1 , max_text_line_w);
772 box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
776 drawbox(picref, dtext->x, dtext->y, box_w, box_h,
777 dtext->box_line, dtext->pixel_step, dtext->boxcolor_rgba,
778 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
780 if (dtext->shadowx || dtext->shadowy) {
781 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
782 dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
786 if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
787 dtext->fontcolor, 0, 0)) < 0)
793 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
795 static void end_frame(AVFilterLink *inlink)
797 AVFilterContext *ctx = inlink->dst;
798 AVFilterLink *outlink = ctx->outputs[0];
799 DrawTextContext *dtext = ctx->priv;
800 AVFilterBufferRef *picref = inlink->cur_buf;
802 dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
803 NAN : picref->pts * av_q2d(inlink->time_base);
805 draw_text(ctx, picref, picref->video->w, picref->video->h);
807 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
808 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
809 (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
812 dtext->var_values[VAR_N] += 1.0;
814 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
815 avfilter_end_frame(outlink);
818 AVFilter avfilter_vf_drawtext = {
820 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
821 .priv_size = sizeof(DrawTextContext),
824 .query_formats = query_formats,
826 .inputs = (const AVFilterPad[]) {{ .name = "default",
827 .type = AVMEDIA_TYPE_VIDEO,
828 .get_video_buffer = avfilter_null_get_video_buffer,
829 .start_frame = avfilter_null_start_frame,
830 .draw_slice = null_draw_slice,
831 .end_frame = end_frame,
832 .config_props = config_input,
833 .min_perms = AV_PERM_WRITE |
835 .rej_perms = AV_PERM_PRESERVE },
837 .outputs = (const AVFilterPad[]) {{ .name = "default",
838 .type = AVMEDIA_TYPE_VIDEO, },
840 .process_command = command,