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