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
34 #include <sys/types.h>
39 #if CONFIG_LIBFONTCONFIG
40 #include <fontconfig/fontconfig.h>
43 #include "libavutil/avstring.h"
44 #include "libavutil/bprint.h"
45 #include "libavutil/common.h"
46 #include "libavutil/file.h"
47 #include "libavutil/eval.h"
48 #include "libavutil/opt.h"
49 #include "libavutil/random_seed.h"
50 #include "libavutil/parseutils.h"
51 #include "libavutil/timecode.h"
52 #include "libavutil/tree.h"
53 #include "libavutil/lfg.h"
55 #include "drawutils.h"
61 #include FT_FREETYPE_H
65 static const char *const var_names[] = {
68 "line_h", "lh", ///< line height, same as max_glyph_h
69 "main_h", "h", "H", ///< height of the input video
70 "main_w", "w", "W", ///< width of the input video
71 "max_glyph_a", "ascent", ///< max glyph ascent
72 "max_glyph_d", "descent", ///< min glyph descent
73 "max_glyph_h", ///< max glyph height
74 "max_glyph_w", ///< max glyph width
75 "n", ///< number of frame
77 "t", ///< timestamp expressed in seconds
78 "text_h", "th", ///< height of the rendered text
79 "text_w", "tw", ///< width of the rendered text
86 static const char *const fun2_names[] = {
90 static double drand(void *opaque, double min, double max)
92 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
95 typedef double (*eval_func2)(void *, double a, double b);
97 static const eval_func2 fun2[] = {
106 VAR_MAIN_H, VAR_h, VAR_H,
107 VAR_MAIN_W, VAR_w, VAR_W,
108 VAR_MAX_GLYPH_A, VAR_ASCENT,
109 VAR_MAX_GLYPH_D, VAR_DESCENT,
123 enum expansion_mode {
129 typedef struct DrawTextContext {
130 const AVClass *class;
131 enum expansion_mode exp_mode; ///< expansion mode to use for the text
132 int reinit; ///< tells if the filter is being reinited
133 #if CONFIG_LIBFONTCONFIG
134 uint8_t *font; ///< font to be used
136 uint8_t *fontfile; ///< font to be used
137 uint8_t *text; ///< text to be drawn
138 AVBPrint expanded_text; ///< used to contain the expanded text
139 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
140 FT_Vector *positions; ///< positions for each element in the text
141 size_t nb_positions; ///< number of elements of positions array
142 char *textfile; ///< file with text to be drawn
143 int x; ///< x position to start drawing text
144 int y; ///< y position to start drawing text
145 int max_glyph_w; ///< max glyph width
146 int max_glyph_h; ///< max glyph height
147 int shadowx, shadowy;
148 int borderw; ///< border width
149 unsigned int fontsize; ///< font size to use
151 short int draw_box; ///< draw box around text - true or false
152 int use_kerning; ///< font kerning is used - true/false
153 int tabsize; ///< tab size
154 int fix_bounds; ///< do we let it go out of frame bounds - t/f
157 FFDrawColor fontcolor; ///< foreground color
158 FFDrawColor shadowcolor; ///< shadow color
159 FFDrawColor bordercolor; ///< border color
160 FFDrawColor boxcolor; ///< background color
162 FT_Library library; ///< freetype font library handle
163 FT_Face face; ///< freetype font face handle
164 FT_Stroker stroker; ///< freetype stroker handle
165 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
166 char *x_expr; ///< expression for x position
167 char *y_expr; ///< expression for y position
168 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
169 int64_t basetime; ///< base pts time in the real world for display
170 double var_values[VAR_VARS_NB];
171 #if FF_API_DRAWTEXT_OLD_TIMELINE
172 char *draw_expr; ///< expression for draw
173 AVExpr *draw_pexpr; ///< parsed expression for draw
174 int draw; ///< set to zero to prevent drawing
176 AVLFG prng; ///< random
177 char *tc_opt_string; ///< specified timecode option string
178 AVRational tc_rate; ///< frame rate for timecode
179 AVTimecode tc; ///< timecode context
180 int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
181 int reload; ///< reload text file for each frame
182 int start_number; ///< starting frame number for n/frame_num var
183 AVDictionary *metadata;
186 #define OFFSET(x) offsetof(DrawTextContext, x)
187 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
189 static const AVOption drawtext_options[]= {
190 {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
191 {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
192 {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
193 {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
194 {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
195 {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
196 {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
197 {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
198 {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
199 {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
200 {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
201 {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
202 {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
203 {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
204 {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
205 {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
206 #if FF_API_DRAWTEXT_OLD_TIMELINE
207 {"draw", "if false do not draw (deprecated)", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
209 #if CONFIG_LIBFONTCONFIG
210 { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
213 {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
214 {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
215 {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
216 {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
218 {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
219 {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
220 {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
221 {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
222 {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
223 {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
224 {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
225 {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
227 /* FT_LOAD_* flags */
228 { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, "ft_load_flags" },
229 { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
230 { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
231 { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
232 { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
233 { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
234 { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
235 { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
236 { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
237 { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
238 { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
239 { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
240 { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
241 { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
242 { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
243 { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
247 AVFILTER_DEFINE_CLASS(drawtext);
249 #undef __FTERRORS_H__
250 #define FT_ERROR_START_LIST {
251 #define FT_ERRORDEF(e, v, s) { (e), (s) },
252 #define FT_ERROR_END_LIST { 0, NULL } };
258 } static ft_errors[] =
261 #define FT_ERRMSG(e) ft_errors[e].err_msg
263 typedef struct Glyph {
266 FT_Bitmap bitmap; ///< array holding bitmaps of font
267 FT_Bitmap border_bitmap; ///< array holding bitmaps of font border
274 static int glyph_cmp(void *key, const void *b)
276 const Glyph *a = key, *bb = b;
277 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
278 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
282 * Load glyphs corresponding to the UTF-32 codepoint code.
284 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
286 DrawTextContext *s = ctx->priv;
287 FT_BitmapGlyph bitmapglyph;
289 struct AVTreeNode *node = NULL;
292 /* load glyph into s->face->glyph */
293 if (FT_Load_Char(s->face, code, s->ft_load_flags))
294 return AVERROR(EINVAL);
297 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
298 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
299 ret = AVERROR(ENOMEM);
304 if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
305 ret = AVERROR(EINVAL);
309 FT_Glyph border_glyph = *glyph->glyph;
310 if (FT_Glyph_StrokeBorder(&border_glyph, s->stroker, 0, 0) ||
311 FT_Glyph_To_Bitmap(&border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
312 ret = AVERROR_EXTERNAL;
315 bitmapglyph = (FT_BitmapGlyph) border_glyph;
316 glyph->border_bitmap = bitmapglyph->bitmap;
318 if (FT_Glyph_To_Bitmap(glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
319 ret = AVERROR_EXTERNAL;
322 bitmapglyph = (FT_BitmapGlyph) *glyph->glyph;
324 glyph->bitmap = bitmapglyph->bitmap;
325 glyph->bitmap_left = bitmapglyph->left;
326 glyph->bitmap_top = bitmapglyph->top;
327 glyph->advance = s->face->glyph->advance.x >> 6;
329 /* measure text height to calculate text_height (or the maximum text height) */
330 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
332 /* cache the newly created glyph */
333 if (!(node = av_tree_node_alloc())) {
334 ret = AVERROR(ENOMEM);
337 av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
345 av_freep(&glyph->glyph);
351 static int load_font_file(AVFilterContext *ctx, const char *path, int index)
353 DrawTextContext *s = ctx->priv;
356 err = FT_New_Face(s->library, path, index, &s->face);
358 av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
359 s->fontfile, FT_ERRMSG(err));
360 return AVERROR(EINVAL);
365 #if CONFIG_LIBFONTCONFIG
366 static int load_font_fontconfig(AVFilterContext *ctx)
368 DrawTextContext *s = ctx->priv;
369 FcConfig *fontconfig;
370 FcPattern *pat, *best;
371 FcResult result = FcResultMatch;
375 int err = AVERROR(ENOENT);
377 fontconfig = FcInitLoadConfigAndFonts();
379 av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
380 return AVERROR_UNKNOWN;
382 pat = FcNameParse(s->fontfile ? s->fontfile :
383 (uint8_t *)(intptr_t)"default");
385 av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
386 return AVERROR(EINVAL);
389 FcPatternAddString(pat, FC_FAMILY, s->font);
391 FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
393 FcDefaultSubstitute(pat);
395 if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
396 av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
397 FcPatternDestroy(pat);
398 return AVERROR(ENOMEM);
401 best = FcFontMatch(fontconfig, pat, &result);
402 FcPatternDestroy(pat);
404 if (!best || result != FcResultMatch) {
405 av_log(ctx, AV_LOG_ERROR,
406 "Cannot find a valid font for the family %s\n",
412 FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
413 FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
414 av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
415 return AVERROR(EINVAL);
418 if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
419 av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
424 av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
426 s->fontsize = size + 0.5;
428 err = load_font_file(ctx, filename, index);
431 FcConfigDestroy(fontconfig);
433 FcPatternDestroy(best);
438 static int load_font(AVFilterContext *ctx)
440 DrawTextContext *s = ctx->priv;
443 /* load the face, and set up the encoding, which is by default UTF-8 */
444 err = load_font_file(ctx, s->fontfile, 0);
447 #if CONFIG_LIBFONTCONFIG
448 err = load_font_fontconfig(ctx);
455 static int load_textfile(AVFilterContext *ctx)
457 DrawTextContext *s = ctx->priv;
463 if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
464 av_log(ctx, AV_LOG_ERROR,
465 "The text file '%s' could not be read or is empty\n",
470 if (!(tmp = av_realloc(s->text, textbuf_size + 1))) {
471 av_file_unmap(textbuf, textbuf_size);
472 return AVERROR(ENOMEM);
475 memcpy(s->text, textbuf, textbuf_size);
476 s->text[textbuf_size] = 0;
477 av_file_unmap(textbuf, textbuf_size);
482 static av_cold int init(AVFilterContext *ctx)
485 DrawTextContext *s = ctx->priv;
488 #if FF_API_DRAWTEXT_OLD_TIMELINE
490 av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "
491 "you are encouraged to use the generic timeline support through the 'enable' option\n");
494 if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
495 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
496 return AVERROR(EINVAL);
501 av_log(ctx, AV_LOG_ERROR,
502 "Both text and text file provided. Please provide only one\n");
503 return AVERROR(EINVAL);
505 if ((err = load_textfile(ctx)) < 0)
509 if (s->reload && !s->textfile)
510 av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
512 if (s->tc_opt_string) {
513 int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
514 s->tc_opt_string, ctx);
518 s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
520 s->text = av_strdup("");
524 av_log(ctx, AV_LOG_ERROR,
525 "Either text, a valid file or a timecode must be provided\n");
526 return AVERROR(EINVAL);
529 if ((err = FT_Init_FreeType(&(s->library)))) {
530 av_log(ctx, AV_LOG_ERROR,
531 "Could not load FreeType: %s\n", FT_ERRMSG(err));
532 return AVERROR(EINVAL);
535 err = load_font(ctx);
540 if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
541 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
542 s->fontsize, FT_ERRMSG(err));
543 return AVERROR(EINVAL);
547 if (FT_Stroker_New(s->library, &s->stroker)) {
548 av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");
549 return AVERROR_EXTERNAL;
551 FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
552 FT_STROKER_LINEJOIN_ROUND, 0);
555 s->use_kerning = FT_HAS_KERNING(s->face);
557 /* load the fallback glyph with code 0 */
558 load_glyph(ctx, NULL, 0);
560 /* set the tabsize in pixels */
561 if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
562 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
565 s->tabsize *= glyph->advance;
567 if (s->exp_mode == EXP_STRFTIME &&
568 (strchr(s->text, '%') || strchr(s->text, '\\')))
569 av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
571 av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
576 static int query_formats(AVFilterContext *ctx)
578 ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
582 static int glyph_enu_free(void *opaque, void *elem)
586 FT_Done_Glyph(*glyph->glyph);
587 av_freep(&glyph->glyph);
592 static av_cold void uninit(AVFilterContext *ctx)
594 DrawTextContext *s = ctx->priv;
596 av_expr_free(s->x_pexpr);
597 av_expr_free(s->y_pexpr);
598 #if FF_API_DRAWTEXT_OLD_TIMELINE
599 av_expr_free(s->draw_pexpr);
600 s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
602 av_freep(&s->positions);
606 av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
607 av_tree_destroy(s->glyphs);
610 FT_Done_Face(s->face);
611 FT_Stroker_Done(s->stroker);
612 FT_Done_FreeType(s->library);
614 av_bprint_finalize(&s->expanded_text, NULL);
617 static inline int is_newline(uint32_t c)
619 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
622 static int config_input(AVFilterLink *inlink)
624 AVFilterContext *ctx = inlink->dst;
625 DrawTextContext *s = ctx->priv;
628 ff_draw_init(&s->dc, inlink->format, 0);
629 ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
630 ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
631 ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
632 ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
634 s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
635 s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
636 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
637 s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
638 s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
639 s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
640 s->var_values[VAR_X] = NAN;
641 s->var_values[VAR_Y] = NAN;
642 s->var_values[VAR_T] = NAN;
644 av_lfg_init(&s->prng, av_get_random_seed());
646 av_expr_free(s->x_pexpr);
647 av_expr_free(s->y_pexpr);
648 #if FF_API_DRAWTEXT_OLD_TIMELINE
649 av_expr_free(s->draw_pexpr);
650 s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
652 s->x_pexpr = s->y_pexpr = NULL;
655 if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
656 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
657 (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
658 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
660 return AVERROR(EINVAL);
661 #if FF_API_DRAWTEXT_OLD_TIMELINE
663 (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,
664 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
671 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
673 DrawTextContext *s = ctx->priv;
675 if (!strcmp(cmd, "reinit")) {
679 if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
681 if ((ret = init(ctx)) < 0)
683 return config_input(ctx->inputs[0]);
686 return AVERROR(ENOSYS);
689 static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
690 char *fct, unsigned argc, char **argv, int tag)
692 DrawTextContext *s = ctx->priv;
694 av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
698 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
699 char *fct, unsigned argc, char **argv, int tag)
701 DrawTextContext *s = ctx->priv;
703 double pts = s->var_values[VAR_T];
706 fmt = argc >= 1 ? argv[0] : "flt";
709 if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
710 av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
713 pts += (double)delta / AV_TIME_BASE;
715 if (!strcmp(fmt, "flt")) {
716 av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
717 } else if (!strcmp(fmt, "hms")) {
719 av_bprintf(bp, " ??:??:??.???");
721 int64_t ms = round(pts * 1000);
727 av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
728 (int)(ms / (60 * 60 * 1000)),
729 (int)(ms / (60 * 1000)) % 60,
730 (int)(ms / 1000) % 60,
734 av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
735 return AVERROR(EINVAL);
740 static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
741 char *fct, unsigned argc, char **argv, int tag)
743 DrawTextContext *s = ctx->priv;
745 av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
749 static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
750 char *fct, unsigned argc, char **argv, int tag)
752 DrawTextContext *s = ctx->priv;
753 AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
756 av_bprintf(bp, "%s", e->value);
760 #if !HAVE_LOCALTIME_R
761 static void localtime_r(const time_t *t, struct tm *tm)
767 static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
768 char *fct, unsigned argc, char **argv, int tag)
770 const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
776 localtime_r(&now, &tm);
779 av_bprint_strftime(bp, fmt, &tm);
783 static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
784 char *fct, unsigned argc, char **argv, int tag)
786 DrawTextContext *s = ctx->priv;
790 ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
791 NULL, NULL, fun2_names, fun2,
794 av_log(ctx, AV_LOG_ERROR,
795 "Expression '%s' for the expr text expansion function is not valid\n",
798 av_bprintf(bp, "%f", res);
803 static const struct drawtext_function {
805 unsigned argc_min, argc_max;
806 int tag; /**< opaque argument to func */
807 int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
809 { "expr", 1, 1, 0, func_eval_expr },
810 { "e", 1, 1, 0, func_eval_expr },
811 { "pict_type", 0, 0, 0, func_pict_type },
812 { "pts", 0, 2, 0, func_pts },
813 { "gmtime", 0, 1, 'G', func_strftime },
814 { "localtime", 0, 1, 'L', func_strftime },
815 { "frame_num", 0, 0, 0, func_frame_num },
816 { "n", 0, 0, 0, func_frame_num },
817 { "metadata", 1, 1, 0, func_metadata },
820 static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
821 unsigned argc, char **argv)
825 for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
826 if (strcmp(fct, functions[i].name))
828 if (argc < functions[i].argc_min) {
829 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
830 fct, functions[i].argc_min);
831 return AVERROR(EINVAL);
833 if (argc > functions[i].argc_max) {
834 av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
835 fct, functions[i].argc_max);
836 return AVERROR(EINVAL);
840 if (i >= FF_ARRAY_ELEMS(functions)) {
841 av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
842 return AVERROR(EINVAL);
844 return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
847 static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
849 const char *text = *rtext;
850 char *argv[16] = { NULL };
851 unsigned argc = 0, i;
855 av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
856 return AVERROR(EINVAL);
860 if (!(argv[argc++] = av_get_token(&text, ":}"))) {
861 ret = AVERROR(ENOMEM);
865 av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
866 ret = AVERROR(EINVAL);
869 if (argc == FF_ARRAY_ELEMS(argv))
870 av_freep(&argv[--argc]); /* error will be caught later */
876 if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
879 *rtext = (char *)text + 1;
882 for (i = 0; i < argc; i++)
887 static int expand_text(AVFilterContext *ctx)
889 DrawTextContext *s = ctx->priv;
890 char *text = s->text;
891 AVBPrint *bp = &s->expanded_text;
896 if (*text == '\\' && text[1]) {
897 av_bprint_chars(bp, text[1], 1);
899 } else if (*text == '%') {
901 if ((ret = expand_function(ctx, bp, &text)) < 0)
904 av_bprint_chars(bp, *text, 1);
908 if (!av_bprint_is_complete(bp))
909 return AVERROR(ENOMEM);
913 static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
914 int width, int height, const uint8_t rgbcolor[4],
915 FFDrawColor *color, int x, int y, int borderw)
917 char *text = s->expanded_text.str;
923 for (i = 0, p = text; *p; i++) {
926 GET_UTF8(code, *p++, continue;);
928 /* skip new line chars, just go to new line */
929 if (code == '\n' || code == '\r' || code == '\t')
933 glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
935 bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;
937 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
938 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
939 return AVERROR(EINVAL);
941 x1 = s->positions[i].x+s->x+x - borderw;
942 y1 = s->positions[i].y+s->y+y - borderw;
944 ff_blend_mask(&s->dc, color,
945 frame->data, frame->linesize, width, height,
946 bitmap.buffer, bitmap.pitch,
947 bitmap.width, bitmap.rows,
948 bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
955 static int draw_text(AVFilterContext *ctx, AVFrame *frame,
956 int width, int height)
958 DrawTextContext *s = ctx->priv;
959 AVFilterLink *inlink = ctx->inputs[0];
961 uint32_t code = 0, prev_code = 0;
962 int x = 0, y = 0, i = 0, ret;
963 int max_text_line_w = 0, len;
967 int y_min = 32000, y_max = -32000;
968 int x_min = 32000, x_max = -32000;
970 Glyph *glyph = NULL, *prev_glyph = NULL;
973 time_t now = time(0);
975 AVBPrint *bp = &s->expanded_text;
979 if(s->basetime != AV_NOPTS_VALUE)
980 now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
982 switch (s->exp_mode) {
984 av_bprintf(bp, "%s", s->text);
987 if ((ret = expand_text(ctx)) < 0)
991 localtime_r(&now, <ime);
992 av_bprint_strftime(bp, s->text, <ime);
996 if (s->tc_opt_string) {
997 char tcbuf[AV_TIMECODE_STR_SIZE];
998 av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
1000 av_bprintf(bp, "%s%s", s->text, tcbuf);
1003 if (!av_bprint_is_complete(bp))
1004 return AVERROR(ENOMEM);
1005 text = s->expanded_text.str;
1006 if ((len = s->expanded_text.len) > s->nb_positions) {
1007 if (!(s->positions =
1008 av_realloc(s->positions, len*sizeof(*s->positions))))
1009 return AVERROR(ENOMEM);
1010 s->nb_positions = len;
1016 /* load and cache glyphs */
1017 for (i = 0, p = text; *p; i++) {
1018 GET_UTF8(code, *p++, continue;);
1022 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1024 load_glyph(ctx, &glyph, code);
1027 y_min = FFMIN(glyph->bbox.yMin, y_min);
1028 y_max = FFMAX(glyph->bbox.yMax, y_max);
1029 x_min = FFMIN(glyph->bbox.xMin, x_min);
1030 x_max = FFMAX(glyph->bbox.xMax, x_max);
1032 s->max_glyph_h = y_max - y_min;
1033 s->max_glyph_w = x_max - x_min;
1035 /* compute and save position for each glyph */
1037 for (i = 0, p = text; *p; i++) {
1038 GET_UTF8(code, *p++, continue;);
1040 /* skip the \n in the sequence \r\n */
1041 if (prev_code == '\r' && code == '\n')
1045 if (is_newline(code)) {
1047 max_text_line_w = FFMAX(max_text_line_w, x);
1048 y += s->max_glyph_h;
1056 glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
1059 if (s->use_kerning && prev_glyph && glyph->code) {
1060 FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
1061 ft_kerning_default, &delta);
1066 s->positions[i].x = x + glyph->bitmap_left;
1067 s->positions[i].y = y - glyph->bitmap_top + y_max;
1068 if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
1069 else x += glyph->advance;
1072 max_text_line_w = FFMAX(x, max_text_line_w);
1074 s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
1075 s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
1077 s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
1078 s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
1079 s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
1080 s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
1082 s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
1084 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1085 s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
1086 s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
1087 #if FF_API_DRAWTEXT_OLD_TIMELINE
1089 s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);
1094 if (ctx->is_disabled)
1098 box_w = FFMIN(width - 1 , max_text_line_w);
1099 box_h = FFMIN(height - 1, y + s->max_glyph_h);
1103 ff_blend_rectangle(&s->dc, &s->boxcolor,
1104 frame->data, frame->linesize, width, height,
1105 s->x, s->y, box_w, box_h);
1107 if (s->shadowx || s->shadowy) {
1108 if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba,
1109 &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)
1114 if ((ret = draw_glyphs(s, frame, width, height, s->bordercolor.rgba,
1115 &s->bordercolor, 0, 0, s->borderw)) < 0)
1118 if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba,
1119 &s->fontcolor, 0, 0, 0)) < 0)
1125 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
1127 AVFilterContext *ctx = inlink->dst;
1128 AVFilterLink *outlink = ctx->outputs[0];
1129 DrawTextContext *s = ctx->priv;
1133 if ((ret = load_textfile(ctx)) < 0)
1136 s->var_values[VAR_N] = inlink->frame_count+s->start_number;
1137 s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
1138 NAN : frame->pts * av_q2d(inlink->time_base);
1140 s->var_values[VAR_PICT_TYPE] = frame->pict_type;
1141 s->metadata = av_frame_get_metadata(frame);
1143 draw_text(ctx, frame, frame->width, frame->height);
1145 av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
1146 (int)s->var_values[VAR_N], s->var_values[VAR_T],
1147 (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
1150 return ff_filter_frame(outlink, frame);
1153 static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
1156 .type = AVMEDIA_TYPE_VIDEO,
1157 .filter_frame = filter_frame,
1158 .config_props = config_input,
1159 .needs_writable = 1,
1164 static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
1167 .type = AVMEDIA_TYPE_VIDEO,
1172 AVFilter ff_vf_drawtext = {
1174 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
1175 .priv_size = sizeof(DrawTextContext),
1176 .priv_class = &drawtext_class,
1179 .query_formats = query_formats,
1180 .inputs = avfilter_vf_drawtext_inputs,
1181 .outputs = avfilter_vf_drawtext_outputs,
1182 .process_command = command,
1183 #if FF_API_DRAWTEXT_OLD_TIMELINE
1184 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
1186 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,