Add more missing includes after removing the implicit common.h
[libav.git] / libavfilter / vf_drawtext.c
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1/*
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>
5 *
5ac4952a 6 * This file is part of Libav.
a5b64584 7 *
5ac4952a 8 * Libav is free software; you can redistribute it and/or
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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.
12 *
5ac4952a 13 * Libav is distributed in the hope that it will be useful,
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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.
17 *
18 * You should have received a copy of the GNU Lesser General Public
5ac4952a 19 * License along with Libav; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
124e2884 25 * drawtext filter, based on the original vhook/drawtext.c
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26 * filter by Gustavo Sverzut Barbieri
27 */
28
29#include <sys/time.h>
30#include <time.h>
31
32#include "libavutil/colorspace.h"
33e11284 33#include "libavutil/common.h"
a5b64584 34#include "libavutil/file.h"
2cf74eca 35#include "libavutil/eval.h"
a5b64584 36#include "libavutil/opt.h"
2cf74eca 37#include "libavutil/mathematics.h"
f5edfc9e 38#include "libavutil/random_seed.h"
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39#include "libavutil/parseutils.h"
40#include "libavutil/pixdesc.h"
41#include "libavutil/tree.h"
f5edfc9e 42#include "libavutil/lfg.h"
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43#include "avfilter.h"
44#include "drawutils.h"
b74a1da4 45#include "formats.h"
9d0bfc50 46#include "internal.h"
c04c533f 47#include "video.h"
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48
49#undef time
50
51#include <ft2build.h>
52#include <freetype/config/ftheader.h>
53#include FT_FREETYPE_H
54#include FT_GLYPH_H
55
b0f29db5 56static const char *const var_names[] = {
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57 "E",
58 "PHI",
59 "PI",
60 "main_w", "W", ///< width of the main video
61 "main_h", "H", ///< height of the main video
62 "text_w", "w", ///< width of the overlay text
63 "text_h", "h", ///< height of the overlay text
64 "x",
65 "y",
66 "n", ///< number of processed frames
67 "t", ///< timestamp expressed in seconds
68 NULL
69};
70
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71static const char *const fun2_names[] = {
72 "rand"
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73};
74
75static double drand(void *opaque, double min, double max)
76{
78212cef 77 return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
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78}
79
80typedef double (*eval_func2)(void *, double a, double b);
81
82static const eval_func2 fun2[] = {
83 drand,
84 NULL
85};
86
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87enum var_name {
88 VAR_E,
89 VAR_PHI,
90 VAR_PI,
91 VAR_MAIN_W, VAR_MW,
92 VAR_MAIN_H, VAR_MH,
93 VAR_TEXT_W, VAR_TW,
94 VAR_TEXT_H, VAR_TH,
95 VAR_X,
96 VAR_Y,
97 VAR_N,
98 VAR_T,
99 VAR_VARS_NB
100};
101
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102typedef struct {
103 const AVClass *class;
104 uint8_t *fontfile; ///< font to be used
105 uint8_t *text; ///< text to be drawn
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106 uint8_t *expanded_text; ///< used to contain the strftime()-expanded text
107 size_t expanded_text_size; ///< size in bytes of the expanded_text buffer
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108 int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
109 FT_Vector *positions; ///< positions for each element in the text
3fd53def 110 size_t nb_positions; ///< number of elements of positions array
a5b64584 111 char *textfile; ///< file with text to be drawn
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112 int x, y; ///< position to start drawing text
113 int w, h; ///< dimension of the text block
c5420f10 114 int shadowx, shadowy;
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115 unsigned int fontsize; ///< font size to use
116 char *fontcolor_string; ///< font color as string
117 char *boxcolor_string; ///< box color as string
c5420f10 118 char *shadowcolor_string; ///< shadow color as string
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119 uint8_t fontcolor[4]; ///< foreground color
120 uint8_t boxcolor[4]; ///< background color
c5420f10 121 uint8_t shadowcolor[4]; ///< shadow color
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122 uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
123 uint8_t boxcolor_rgba[4]; ///< background color in RGBA
c5420f10 124 uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
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125
126 short int draw_box; ///< draw box around text - true or false
127 int use_kerning; ///< font kerning is used - true/false
128 int tabsize; ///< tab size
e496c45d 129 int fix_bounds; ///< do we let it go out of frame bounds - t/f
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130
131 FT_Library library; ///< freetype font library handle
132 FT_Face face; ///< freetype font face handle
133 struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
134 int hsub, vsub; ///< chroma subsampling values
135 int is_packed_rgb;
136 int pixel_step[4]; ///< distance in bytes between the component of each pixel
137 uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
138 uint8_t *box_line[4]; ///< line used for filling the box background
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139 char *x_expr, *y_expr;
140 AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
141 double var_values[VAR_VARS_NB];
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142 char *d_expr;
143 AVExpr *d_pexpr;
2cf74eca 144 int draw; ///< set to zero to prevent drawing
f5edfc9e 145 AVLFG prng; ///< random
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146} DrawTextContext;
147
148#define OFFSET(x) offsetof(DrawTextContext, x)
149
150static const AVOption drawtext_options[]= {
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151{"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
152{"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
153{"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
154{"fontcolor","set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
155{"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
156{"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
157{"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 },
158{"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, 72 },
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159{"x", "set x", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
160{"y", "set y", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX },
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161{"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
162{"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX },
163{"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
73585620 164{"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
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165{"fix_bounds", "if true, check and fix text coords to avoid clipping",
166 OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 },
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167
168/* FT_LOAD_* flags */
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169{"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" },
170{"default", "set default", 0, AV_OPT_TYPE_CONST, {FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
171{"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
172{"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
173{"render", "set render", 0, AV_OPT_TYPE_CONST, {FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
174{"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
175{"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
176{"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
177{"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
178{"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
179{"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
180{"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
181{"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
182{"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
183{"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
184{"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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185{NULL},
186};
187
188static const char *drawtext_get_name(void *ctx)
189{
190 return "drawtext";
191}
192
193static const AVClass drawtext_class = {
194 "DrawTextContext",
195 drawtext_get_name,
196 drawtext_options
197};
198
199#undef __FTERRORS_H__
200#define FT_ERROR_START_LIST {
201#define FT_ERRORDEF(e, v, s) { (e), (s) },
202#define FT_ERROR_END_LIST { 0, NULL } };
203
204struct ft_error
205{
206 int err;
207 const char *err_msg;
208} static ft_errors[] =
209#include FT_ERRORS_H
210
211#define FT_ERRMSG(e) ft_errors[e].err_msg
212
213typedef struct {
214 FT_Glyph *glyph;
215 uint32_t code;
216 FT_Bitmap bitmap; ///< array holding bitmaps of font
217 FT_BBox bbox;
218 int advance;
219 int bitmap_left;
220 int bitmap_top;
221} Glyph;
222
223static int glyph_cmp(void *key, const void *b)
224{
225 const Glyph *a = key, *bb = b;
226 int64_t diff = (int64_t)a->code - (int64_t)bb->code;
227 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
228}
229
230/**
231 * Load glyphs corresponding to the UTF-32 codepoint code.
232 */
233static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
234{
235 DrawTextContext *dtext = ctx->priv;
236 Glyph *glyph;
237 struct AVTreeNode *node = NULL;
238 int ret;
239
240 /* load glyph into dtext->face->glyph */
241 if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
242 return AVERROR(EINVAL);
243
244 /* save glyph */
245 if (!(glyph = av_mallocz(sizeof(*glyph))) ||
246 !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
247 ret = AVERROR(ENOMEM);
248 goto error;
249 }
250 glyph->code = code;
251
252 if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
253 ret = AVERROR(EINVAL);
254 goto error;
255 }
256
257 glyph->bitmap = dtext->face->glyph->bitmap;
258 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
259 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
260 glyph->advance = dtext->face->glyph->advance.x >> 6;
261
262 /* measure text height to calculate text_height (or the maximum text height) */
263 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
264
265 /* cache the newly created glyph */
266 if (!(node = av_mallocz(av_tree_node_size))) {
267 ret = AVERROR(ENOMEM);
268 goto error;
269 }
270 av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
271
272 if (glyph_ptr)
273 *glyph_ptr = glyph;
274 return 0;
275
276error:
277 if (glyph)
278 av_freep(&glyph->glyph);
279 av_freep(&glyph);
280 av_freep(&node);
281 return ret;
282}
283
a5e8c41c 284static av_cold int init(AVFilterContext *ctx, const char *args)
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285{
286 int err;
287 DrawTextContext *dtext = ctx->priv;
288 Glyph *glyph;
289
290 dtext->class = &drawtext_class;
79eff913 291 av_opt_set_defaults(dtext);
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292 dtext->fontcolor_string = av_strdup("black");
293 dtext->boxcolor_string = av_strdup("white");
c5420f10 294 dtext->shadowcolor_string = av_strdup("black");
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295
296 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
297 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
298 return err;
299 }
300
301 if (!dtext->fontfile) {
302 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
303 return AVERROR(EINVAL);
304 }
305
306 if (dtext->textfile) {
307 uint8_t *textbuf;
308 size_t textbuf_size;
309
310 if (dtext->text) {
311 av_log(ctx, AV_LOG_ERROR,
312 "Both text and text file provided. Please provide only one\n");
313 return AVERROR(EINVAL);
314 }
315 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
316 av_log(ctx, AV_LOG_ERROR,
317 "The text file '%s' could not be read or is empty\n",
318 dtext->textfile);
319 return err;
320 }
321
322 if (!(dtext->text = av_malloc(textbuf_size+1)))
323 return AVERROR(ENOMEM);
324 memcpy(dtext->text, textbuf, textbuf_size);
325 dtext->text[textbuf_size] = 0;
326 av_file_unmap(textbuf, textbuf_size);
327 }
328
329 if (!dtext->text) {
330 av_log(ctx, AV_LOG_ERROR,
331 "Either text or a valid file must be provided\n");
332 return AVERROR(EINVAL);
333 }
334
335 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
336 av_log(ctx, AV_LOG_ERROR,
337 "Invalid font color '%s'\n", dtext->fontcolor_string);
338 return err;
339 }
340
341 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
342 av_log(ctx, AV_LOG_ERROR,
343 "Invalid box color '%s'\n", dtext->boxcolor_string);
344 return err;
345 }
346
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347 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
348 av_log(ctx, AV_LOG_ERROR,
349 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
350 return err;
351 }
352
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353 if ((err = FT_Init_FreeType(&(dtext->library)))) {
354 av_log(ctx, AV_LOG_ERROR,
355 "Could not load FreeType: %s\n", FT_ERRMSG(err));
356 return AVERROR(EINVAL);
357 }
358
359 /* load the face, and set up the encoding, which is by default UTF-8 */
360 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
361 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
362 dtext->fontfile, FT_ERRMSG(err));
363 return AVERROR(EINVAL);
364 }
365 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
366 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
367 dtext->fontsize, FT_ERRMSG(err));
368 return AVERROR(EINVAL);
369 }
370
371 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
372
373 /* load the fallback glyph with code 0 */
374 load_glyph(ctx, NULL, 0);
375
376 /* set the tabsize in pixels */
377 if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
378 av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
379 return err;
380 }
381 dtext->tabsize *= glyph->advance;
382
383#if !HAVE_LOCALTIME_R
384 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
385#endif
386
387 return 0;
388}
389
390static int query_formats(AVFilterContext *ctx)
391{
392 static const enum PixelFormat pix_fmts[] = {
393 PIX_FMT_ARGB, PIX_FMT_RGBA,
394 PIX_FMT_ABGR, PIX_FMT_BGRA,
395 PIX_FMT_RGB24, PIX_FMT_BGR24,
396 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
397 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
398 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
399 PIX_FMT_NONE
400 };
401
b74a1da4 402 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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403 return 0;
404}
405
406static int glyph_enu_free(void *opaque, void *elem)
407{
408 av_free(elem);
409 return 0;
410}
411
412static av_cold void uninit(AVFilterContext *ctx)
413{
414 DrawTextContext *dtext = ctx->priv;
415 int i;
416
417 av_freep(&dtext->fontfile);
418 av_freep(&dtext->text);
3fd53def 419 av_freep(&dtext->expanded_text);
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420 av_freep(&dtext->fontcolor_string);
421 av_freep(&dtext->boxcolor_string);
422 av_freep(&dtext->positions);
c5420f10 423 av_freep(&dtext->shadowcolor_string);
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424 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
425 av_tree_destroy(dtext->glyphs);
426 dtext->glyphs = 0;
427 FT_Done_Face(dtext->face);
428 FT_Done_FreeType(dtext->library);
429
430 for (i = 0; i < 4; i++) {
431 av_freep(&dtext->box_line[i]);
432 dtext->pixel_step[i] = 0;
433 }
434
435}
436
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437static inline int is_newline(uint32_t c)
438{
d4b63054 439 return c == '\n' || c == '\r' || c == '\f' || c == '\v';
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440}
441
2cf74eca 442static int dtext_prepare_text(AVFilterContext *ctx)
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443{
444 DrawTextContext *dtext = ctx->priv;
445 uint32_t code = 0, prev_code = 0;
446 int x = 0, y = 0, i = 0, ret;
447 int text_height, baseline;
448 char *text = dtext->text;
449 uint8_t *p;
450 int str_w = 0, len;
451 int y_min = 32000, y_max = -32000;
452 FT_Vector delta;
453 Glyph *glyph = NULL, *prev_glyph = NULL;
454 Glyph dummy = { 0 };
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455 int width = ctx->inputs[0]->w;
456 int height = ctx->inputs[0]->h;
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457
458#if HAVE_LOCALTIME_R
459 time_t now = time(0);
460 struct tm ltime;
461 uint8_t *buf = dtext->expanded_text;
462 int buf_size = dtext->expanded_text_size;
463
464 if (!buf)
465 buf_size = 2*strlen(dtext->text)+1;
466
467 localtime_r(&now, &ltime);
468
469 while ((buf = av_realloc(buf, buf_size))) {
470 *buf = 1;
471 if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)
472 break;
473 buf_size *= 2;
474 }
475
476 if (!buf)
477 return AVERROR(ENOMEM);
478 text = dtext->expanded_text = buf;
479 dtext->expanded_text_size = buf_size;
480#endif
481
482 if ((len = strlen(text)) > dtext->nb_positions) {
483 FT_Vector *p = av_realloc(dtext->positions,
484 len * sizeof(*dtext->positions));
485 if (!p) {
486 av_freep(dtext->positions);
487 dtext->nb_positions = 0;
488 return AVERROR(ENOMEM);
489 } else {
490 dtext->positions = p;
491 dtext->nb_positions = len;
492 }
493 }
494
495 /* load and cache glyphs */
496 for (i = 0, p = text; *p; i++) {
497 GET_UTF8(code, *p++, continue;);
498
499 /* get glyph */
500 dummy.code = code;
501 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
e7f0bc8c 502 if (!glyph) {
ec11ff84 503 ret = load_glyph(ctx, &glyph, code);
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504 if (ret)
505 return ret;
506 }
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507
508 y_min = FFMIN(glyph->bbox.yMin, y_min);
509 y_max = FFMAX(glyph->bbox.yMax, y_max);
510 }
511 text_height = y_max - y_min;
512 baseline = y_max;
513
514 /* compute and save position for each glyph */
515 glyph = NULL;
516 for (i = 0, p = text; *p; i++) {
517 GET_UTF8(code, *p++, continue;);
518
519 /* skip the \n in the sequence \r\n */
520 if (prev_code == '\r' && code == '\n')
521 continue;
522
523 prev_code = code;
524 if (is_newline(code)) {
525 str_w = FFMAX(str_w, x - dtext->x);
526 y += text_height;
527 x = 0;
528 continue;
529 }
530
531 /* get glyph */
532 prev_glyph = glyph;
533 dummy.code = code;
534 glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
535
536 /* kerning */
537 if (dtext->use_kerning && prev_glyph && glyph->code) {
538 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
539 ft_kerning_default, &delta);
540 x += delta.x >> 6;
541 }
542
543 if (x + glyph->bbox.xMax >= width) {
544 str_w = FFMAX(str_w, x);
545 y += text_height;
546 x = 0;
547 }
548
549 /* save position */
550 dtext->positions[i].x = x + glyph->bitmap_left;
551 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
552 if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
553 else x += glyph->advance;
554 }
555
556 str_w = FFMIN(width - 1, FFMAX(str_w, x));
557 y = FFMIN(y + text_height, height - 1);
558
559 dtext->w = str_w;
2b43dfce 560 dtext->var_values[VAR_TEXT_W] = dtext->var_values[VAR_TW] = dtext->w;
ec11ff84 561 dtext->h = y;
2b43dfce 562 dtext->var_values[VAR_TEXT_H] = dtext->var_values[VAR_TH] = dtext->h;
ec11ff84
LB
563
564 return 0;
565}
566
567
a5b64584
SS
568static int config_input(AVFilterLink *inlink)
569{
ec11ff84
LB
570 AVFilterContext *ctx = inlink->dst;
571 DrawTextContext *dtext = ctx->priv;
a5b64584
SS
572 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
573 int ret;
574
575 dtext->hsub = pix_desc->log2_chroma_w;
576 dtext->vsub = pix_desc->log2_chroma_h;
577
2cf74eca
LB
578 dtext->var_values[VAR_E ] = M_E;
579 dtext->var_values[VAR_PHI] = M_PHI;
580 dtext->var_values[VAR_PI ] = M_PI;
581
582 dtext->var_values[VAR_MAIN_W] =
583 dtext->var_values[VAR_MW] = ctx->inputs[0]->w;
584 dtext->var_values[VAR_MAIN_H] =
585 dtext->var_values[VAR_MH] = ctx->inputs[0]->h;
586
587 dtext->var_values[VAR_X] = 0;
588 dtext->var_values[VAR_Y] = 0;
589 dtext->var_values[VAR_N] = 0;
590 dtext->var_values[VAR_T] = NAN;
591
f5edfc9e 592 av_lfg_init(&dtext->prng, av_get_random_seed());
2cf74eca
LB
593
594 if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
f5edfc9e 595 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
2cf74eca 596 (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
f5edfc9e 597 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
73585620 598 (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
f5edfc9e 599 NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
2cf74eca
LB
600 return AVERROR(EINVAL);
601
a5b64584
SS
602 if ((ret =
603 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
604 inlink->w, dtext->boxcolor,
605 inlink->format, dtext->boxcolor_rgba,
606 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
607 return ret;
608
609 if (!dtext->is_packed_rgb) {
610 uint8_t *rgba = dtext->fontcolor_rgba;
611 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
612 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
613 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
614 dtext->fontcolor[3] = rgba[3];
c5420f10
MN
615 rgba = dtext->shadowcolor_rgba;
616 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
617 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
618 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
619 dtext->shadowcolor[3] = rgba[3];
a5b64584
SS
620 }
621
2cf74eca
LB
622 dtext->draw = 1;
623
624 return dtext_prepare_text(ctx);
a5b64584
SS
625}
626
627#define GET_BITMAP_VAL(r, c) \
628 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
629 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
630 bitmap->buffer[(r) * bitmap->pitch + (c)]
631
632#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
633 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
3953a880
MN
634 alpha = yuva_color[3] * (val) * 129; \
635 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
a5b81c31
MN
636 if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
637 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
638 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
639 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
640 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
641 }\
a5b64584
SS
642}
643
644static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
645 unsigned int y, unsigned int width, unsigned int height,
646 const uint8_t yuva_color[4], int hsub, int vsub)
647{
648 int r, c, alpha;
649 unsigned int luma_pos, chroma_pos1, chroma_pos2;
965fdda0 650 uint8_t src_val;
a5b64584
SS
651
652 for (r = 0; r < bitmap->rows && r+y < height; r++) {
653 for (c = 0; c < bitmap->width && c+x < width; c++) {
a5b64584
SS
654 /* get intensity value in the glyph bitmap (source) */
655 src_val = GET_BITMAP_VAL(r, c);
656 if (!src_val)
657 continue;
658
659 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
660 }
661 }
662
663 return 0;
664}
665
666#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
667 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
3953a880
MN
668 alpha = rgba_color[3] * (val) * 129; \
669 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
670 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
671 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
a5b64584
SS
672}
673
674static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
675 unsigned int x, unsigned int y,
676 unsigned int width, unsigned int height, int pixel_step,
677 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
678{
679 int r, c, alpha;
680 uint8_t *p;
965fdda0 681 uint8_t src_val;
a5b64584
SS
682
683 for (r = 0; r < bitmap->rows && r+y < height; r++) {
684 for (c = 0; c < bitmap->width && c+x < width; c++) {
a5b64584
SS
685 /* get intensity value in the glyph bitmap (source) */
686 src_val = GET_BITMAP_VAL(r, c);
687 if (!src_val)
688 continue;
689
690 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
691 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
692 }
693 }
694
695 return 0;
696}
697
698static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
699 unsigned int width, unsigned int height,
700 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
701 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
702{
703 int i, j, alpha;
704
705 if (color[3] != 0xFF) {
706 if (is_rgba_packed) {
707 uint8_t *p;
708 for (j = 0; j < height; j++)
709 for (i = 0; i < width; i++)
710 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
711 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
712 } else {
713 unsigned int luma_pos, chroma_pos1, chroma_pos2;
714 for (j = 0; j < height; j++)
715 for (i = 0; i < width; i++)
716 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
717 }
718 } else {
719 ff_draw_rectangle(picref->data, picref->linesize,
720 line, pixel_step, hsub, vsub,
721 x, y, width, height);
722 }
723}
724
e73127a4 725static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
c5420f10 726 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
e73127a4 727{
3fd53def 728 char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;
e73127a4
MN
729 uint32_t code = 0;
730 int i;
731 uint8_t *p;
732 Glyph *glyph = NULL;
733
734 for (i = 0, p = text; *p; i++) {
735 Glyph dummy = { 0 };
736 GET_UTF8(code, *p++, continue;);
737
738 /* skip new line chars, just go to new line */
739 if (code == '\n' || code == '\r' || code == '\t')
740 continue;
741
742 dummy.code = code;
743 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
744
745 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
746 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
747 return AVERROR(EINVAL);
748
749 if (dtext->is_packed_rgb) {
750 draw_glyph_rgb(picref, &glyph->bitmap,
c5420f10
MN
751 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
752 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
e73127a4
MN
753 } else {
754 draw_glyph_yuv(picref, &glyph->bitmap,
c5420f10
MN
755 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
756 yuvcolor, dtext->hsub, dtext->vsub);
e73127a4
MN
757 }
758 }
759
760 return 0;
761}
762
a2fb4bcb
LB
763static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
764 int width, int height)
765{
766 DrawTextContext *dtext = ctx->priv;
767 int ret;
768
a5b64584
SS
769 /* draw box */
770 if (dtext->draw_box)
a2fb4bcb 771 drawbox(picref, dtext->x, dtext->y, dtext->w, dtext->h,
a5b64584 772 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
a2fb4bcb
LB
773 dtext->hsub, dtext->vsub, dtext->is_packed_rgb,
774 dtext->rgba_map);
a5b64584 775
c5420f10 776 if (dtext->shadowx || dtext->shadowy) {
a2fb4bcb
LB
777 if ((ret = draw_glyphs(dtext, picref, width, height,
778 dtext->shadowcolor_rgba,
779 dtext->shadowcolor,
780 dtext->x + dtext->shadowx,
781 dtext->y + dtext->shadowy)) < 0)
c5420f10
MN
782 return ret;
783 }
784
a2fb4bcb
LB
785 if ((ret = draw_glyphs(dtext, picref, width, height,
786 dtext->fontcolor_rgba,
787 dtext->fontcolor,
788 dtext->x,
789 dtext->y)) < 0)
e73127a4 790 return ret;
a5b64584
SS
791
792 return 0;
793}
794
e9b992d0
AK
795static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
796{
797 return 0;
798}
a5b64584 799
2cf74eca
LB
800static inline int normalize_double(int *n, double d)
801{
802 int ret = 0;
803
804 if (isnan(d)) {
805 ret = AVERROR(EINVAL);
806 } else if (d > INT_MAX || d < INT_MIN) {
807 *n = d > INT_MAX ? INT_MAX : INT_MIN;
808 ret = AVERROR(EINVAL);
809 } else
810 *n = round(d);
811
812 return ret;
813}
814
ebc8d974 815static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
2cf74eca
LB
816{
817 AVFilterContext *ctx = inlink->dst;
818 DrawTextContext *dtext = ctx->priv;
7155763b 819 AVFilterBufferRef *buf_out;
ebc8d974 820 int ret = 0;
2cf74eca 821
ebc8d974 822 if ((ret = dtext_prepare_text(ctx)) < 0) {
2cf74eca 823 av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");
ebc8d974 824 return ret;
2cf74eca
LB
825 }
826
827 dtext->var_values[VAR_T] = inpicref->pts == AV_NOPTS_VALUE ?
828 NAN : inpicref->pts * av_q2d(inlink->time_base);
829 dtext->var_values[VAR_X] =
f5edfc9e 830 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
2cf74eca 831 dtext->var_values[VAR_Y] =
f5edfc9e 832 av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
2cf74eca 833 dtext->var_values[VAR_X] =
f5edfc9e 834 av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
2cf74eca 835
ebc8d974 836 dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
73585620 837
2cf74eca
LB
838 normalize_double(&dtext->x, dtext->var_values[VAR_X]);
839 normalize_double(&dtext->y, dtext->var_values[VAR_Y]);
840
e496c45d
AU
841 if (dtext->fix_bounds) {
842 if (dtext->x < 0) dtext->x = 0;
843 if (dtext->y < 0) dtext->y = 0;
844 if ((unsigned)dtext->x + (unsigned)dtext->w > inlink->w)
845 dtext->x = inlink->w - dtext->w;
846 if ((unsigned)dtext->y + (unsigned)dtext->h > inlink->h)
847 dtext->y = inlink->h - dtext->h;
848 }
2cf74eca
LB
849
850 dtext->x &= ~((1 << dtext->hsub) - 1);
851 dtext->y &= ~((1 << dtext->vsub) - 1);
852
853 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
854 (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
855 dtext->x, dtext->y, dtext->x+dtext->w, dtext->y+dtext->h);
856
7155763b 857 buf_out = avfilter_ref_buffer(inpicref, ~0);
ebc8d974
AK
858 if (!buf_out)
859 return AVERROR(ENOMEM);
860
861 return ff_start_frame(inlink->dst->outputs[0], buf_out);
2cf74eca
LB
862}
863
d4f89906 864static int end_frame(AVFilterLink *inlink)
a5b64584
SS
865{
866 AVFilterLink *outlink = inlink->dst->outputs[0];
867 AVFilterBufferRef *picref = inlink->cur_buf;
2cf74eca 868 DrawTextContext *dtext = inlink->dst->priv;
d4f89906 869 int ret;
2cf74eca
LB
870
871 if (dtext->draw)
ec11ff84 872 draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
a5b64584 873
2cf74eca
LB
874 dtext->var_values[VAR_N] += 1.0;
875
d4f89906
AK
876 if ((ret = ff_draw_slice(outlink, 0, picref->video->h, 1)) < 0 ||
877 (ret = ff_end_frame(outlink)) < 0)
878 return ret;
879 return 0;
a5b64584
SS
880}
881
882AVFilter avfilter_vf_drawtext = {
883 .name = "drawtext",
884 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
885 .priv_size = sizeof(DrawTextContext),
886 .init = init,
887 .uninit = uninit,
888 .query_formats = query_formats,
889
3db40703
RB
890 .inputs = (const AVFilterPad[]) {{ .name = "default",
891 .type = AVMEDIA_TYPE_VIDEO,
892 .get_video_buffer = ff_null_get_video_buffer,
893 .start_frame = start_frame,
894 .draw_slice = null_draw_slice,
895 .end_frame = end_frame,
896 .config_props = config_input,
897 .min_perms = AV_PERM_WRITE |
898 AV_PERM_READ,
899 .rej_perms = AV_PERM_PRESERVE },
900 { .name = NULL}},
901 .outputs = (const AVFilterPad[]) {{ .name = "default",
902 .type = AVMEDIA_TYPE_VIDEO, },
903 { .name = NULL}},
a5b64584 904};