vhook/drawtext.c

   1 /*
   2  * drawtext.c: print text over the screen
   3  ******************************************************************************
   4  * Options:
   5  * -f <filename>    font filename (MANDATORY!!!)
   6  * -s <pixel_size>  font size in pixels [default 16]
   7  * -b               print background
   8  * -o               outline glyphs (use the bg color)
   9  * -x <pos>         x position ( >= 0) [default 0]
  10  * -y <pos>         y position ( >= 0) [default 0]
  11  * -t <text>        text to print (will be passed to strftime())
  12  *                  MANDATORY: will be used even when -T is used.
  13  *                  in this case, -t will be used if some error
  14  *                  occurs
  15  * -T <filename>    file with the text (re-read every frame)
  16  * -c <#RRGGBB>     foreground color ('internet' way) [default #ffffff]
  17  * -C <#RRGGBB>     background color ('internet' way) [default #000000]
  18  *
  19  ******************************************************************************
  20  * Features:
  21  * - True Type, Type1 and others via FreeType2 library
  22  * - Font kerning (better output)
  23  * - Line Wrap (if the text doesn't fit, the next char go to the next line)
  24  * - Background box
  25  * - Outline
  26  ******************************************************************************
  27  * Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
  28  *
  29  * This library is free software; you can redistribute it and/or
  30  * modify it under the terms of the GNU Lesser General Public
  31  * License as published by the Free Software Foundation; either
  32  * version 2 of the License, or (at your option) any later version.
  33  *
  34  * This library is distributed in the hope that it will be useful,
  35  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  36  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  37  * Lesser General Public License for more details.
  38  *
  39  * You should have received a copy of the GNU Lesser General Public
  40  * License along with this library; if not, write to the Free Software
  41  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  42  */
  43
  44 #define MAXSIZE_TEXT 1024
  45
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <fcntl.h>
  49 #include <stdarg.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <sys/time.h>
  53 #include <time.h>
  54
  55 #include "framehook.h"
  56
  57 #include <ft2build.h>
  58 #include FT_FREETYPE_H
  59 #include FT_GLYPH_H
  60
  61 #define RGB_TO_YUV(rgb_color, yuv_color) { \
  62     yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) +  16; \
  63     yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \
  64     yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \
  65 }
  66
  67 #define COPY_3(dst,src) { \
  68     dst[0]=src[0]; \
  69     dst[1]=src[1]; \
  70     dst[2]=src[2]; \
  71 }
  72
  73
  74
  75 #define SET_PIXEL(picture, yuv_color, x, y) { \
  76     picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
  77     picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
  78     picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
  79 }
  80
  81 #define GET_PIXEL(picture, yuv_color, x, y) { \
  82     yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
  83     yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
  84     yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
  85 }
  86
  87
  88 typedef struct {
  89   unsigned char *text;
  90   unsigned char *file;
  91   unsigned int x;
  92   unsigned int y;
  93   int bg;
  94   int outline;
  95   unsigned char bgcolor[3]; /* YUV */
  96   unsigned char fgcolor[3]; /* YUV */
  97   FT_Library library;
  98   FT_Face    face;
  99   FT_Glyph   glyphs[ 255 ];
 100   FT_Bitmap  bitmaps[ 255 ];
 101   int        advance[ 255 ];
 102   int        bitmap_left[ 255 ];
 103   int        bitmap_top[ 255 ];
 104   unsigned int glyphs_index[ 255 ];
 105   int        text_height;
 106   int        baseline;
 107   int use_kerning;
 108 } ContextInfo;
 109
 110
 111 void Release(void *ctx)
 112 {
 113     if (ctx)
 114         av_free(ctx);
 115 }
 116
 117
 118 int ParseColor(char *text, unsigned char yuv_color[3])
 119 {
 120   char tmp[3];
 121   unsigned char rgb_color[3];
 122   int i;
 123
 124   tmp[2] = '\0';
 125
 126   if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
 127     return -1;
 128
 129   for (i=0; i < 3; i++)
 130     {
 131       tmp[0] = text[i*2+1];
 132       tmp[1] = text[i*2+2];
 133
 134       rgb_color[i] = strtol(tmp, NULL, 16);
 135     }
 136
 137   RGB_TO_YUV(rgb_color, yuv_color);
 138
 139   return 0;
 140 }
 141
 142 int Configure(void **ctxp, int argc, char *argv[])
 143 {
 144     int c;
 145     int error;
 146     ContextInfo *ci=NULL;
 147     char *font=NULL;
 148     unsigned int size=16;
 149     FT_BBox bbox;
 150     int yMax, yMin;
 151     *ctxp = av_mallocz(sizeof(ContextInfo));
 152     ci = (ContextInfo *) *ctxp;
 153
 154     /* configure Context Info */
 155     ci->text = NULL;
 156     ci->file = NULL;
 157     ci->x = ci->y = 0;
 158     ci->fgcolor[0]=255;
 159     ci->fgcolor[1]=128;
 160     ci->fgcolor[2]=128;
 161     ci->bgcolor[0]=0;
 162     ci->fgcolor[1]=128;
 163     ci->fgcolor[2]=128;
 164     ci->bg = 0;
 165     ci->outline = 0;
 166     ci->text_height = 0;
 167
 168     optind = 0;
 169     while ((c = getopt(argc, argv, "f:t:T:x:y:s:c:C:bo")) > 0) {
 170       switch (c) {
 171       case 'f':
 172         font = optarg;
 173         break;
 174       case 't':
 175         ci->text = av_strdup(optarg);
 176         break;
 177       case 'T':
 178         ci->file = av_strdup(optarg);
 179         break;
 180       case 'x':
 181         ci->x = (unsigned int) atoi(optarg);
 182         break;
 183       case 'y':
 184         ci->y = (unsigned int) atoi(optarg);
 185         break;
 186       case 's':
 187         size = (unsigned int) atoi(optarg);
 188         break;
 189       case 'c':
 190         if (ParseColor(optarg, ci->fgcolor) == -1)
 191           {
 192             fprintf(stderr, "ERROR: Invalid foreground color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -c #ffffff (for white foreground)\n",optarg);
 193             return -1;
 194           }
 195         break;
 196       case 'C':
 197         if (ParseColor(optarg, ci->bgcolor) == -1)
 198           {
 199             fprintf(stderr, "ERROR: Invalid foreground color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -c #ffffff (for white foreground)\n",optarg);
 200             return -1;
 201           }
 202         break;
 203       case 'b':
 204         ci->bg=1;
 205         break;
 206       case 'o':
 207         ci->outline=1;
 208         break;
 209       case '?':
 210         fprintf(stderr, "ERROR: Unrecognized argument '%s'\n", argv[optind]);
 211         return -1;
 212       }
 213     }
 214
 215     if (!ci->text)
 216       {
 217         fprintf(stderr,"ERROR: No text provided (-t text)\n");
 218         return -1;
 219       }
 220
 221     if (ci->file)
 222       {
 223         FILE *fp;
 224         if ((fp=fopen(ci->file, "r")) == NULL)
 225           {
 226             perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
 227           }
 228         else
 229           {
 230             fclose(fp);
 231           }
 232       }
 233
 234     if (!font)
 235       {
 236         fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
 237         return -1;
 238       }
 239
 240     if ((error = FT_Init_FreeType(&(ci->library))) != 0)
 241       {
 242         fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
 243         return -1;
 244       }
 245
 246     if ((error = FT_New_Face( ci->library, font, 0, &(ci->face) )) != 0)
 247       {
 248         fprintf(stderr,"ERROR: Could not load face: %s  (error# %d)\n",font, error);
 249         return -1;
 250       }
 251
 252     if ((error = FT_Set_Pixel_Sizes( ci->face, 0, size)) != 0)
 253       {
 254         fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
 255         return -1;
 256       }
 257
 258     ci->use_kerning = FT_HAS_KERNING(ci->face);
 259
 260     /* load and cache glyphs */
 261     yMax = -32000;
 262     yMin =  32000;
 263     for (c=0; c < 256; c++)
 264       {
 265         /* Load char */
 266         error = FT_Load_Char( ci->face, (unsigned char) c, FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
 267         if (error) continue;  /* ignore errors */
 268
 269         /* Save bitmap */
 270         ci->bitmaps[c] = ci->face->glyph->bitmap;
 271         /* Save bitmap left */
 272         ci->bitmap_left[c] = ci->face->glyph->bitmap_left;
 273         /* Save bitmap top */
 274         ci->bitmap_top[c] = ci->face->glyph->bitmap_top;
 275
 276         /* Save advance */
 277         ci->advance[c] = ci->face->glyph->advance.x >> 6;
 278
 279         /* Save glyph */
 280         error = FT_Get_Glyph( ci->face->glyph, &(ci->glyphs[c]) );
 281         /* Save glyph index */
 282         ci->glyphs_index[c] = FT_Get_Char_Index( ci->face, (unsigned char) c );
 283
 284         /* Measure text height to calculate text_height (or the maximum text height) */
 285         FT_Glyph_Get_CBox( ci->glyphs[ c ], ft_glyph_bbox_pixels, &bbox );
 286         if (bbox.yMax > yMax)
 287           yMax = bbox.yMax;
 288         if (bbox.yMin < yMin)
 289           yMin = bbox.yMin;
 290
 291       }
 292
 293     ci->text_height = yMax - yMin;
 294     ci->baseline = yMax;
 295
 296     return 0;
 297 }
 298
 299
 300
 301
 302 inline void draw_glyph(AVPicture *picture, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_fgcolor[3], unsigned char yuv_bgcolor[3], int outline)
 303 {
 304   int r, c;
 305   int spixel, dpixel[3], in_glyph=0;
 306
 307   if (bitmap->pixel_mode == ft_pixel_mode_mono)
 308     {
 309       in_glyph = 0;
 310       for (r=0; (r < bitmap->rows) && (r+y < height); r++)
 311         {
 312           for (c=0; (c < bitmap->width) && (c+x < width); c++)
 313             {
 314               /* pixel in the picture (destination) */
 315               GET_PIXEL(picture, dpixel, (c+x), (y+r));
 316
 317               /* pixel in the glyph bitmap (source) */
 318               spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8));
 319
 320               if (spixel)
 321                 COPY_3(dpixel, yuv_fgcolor);
 322
 323               if (outline)
 324                 {
 325                   /* border detection: */
 326                   if ( (!in_glyph) && (spixel) )
 327                     /* left border detected */
 328                     {
 329                       in_glyph = 1;
 330                       /* draw left pixel border */
 331                       if (c-1 >= 0)
 332                         SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
 333                     }
 334                   else if ( (in_glyph) && (!spixel) )
 335                     /* right border detected */
 336                     {
 337                       in_glyph = 0;
 338                       /* 'draw' right pixel border */
 339                       COPY_3(dpixel, yuv_bgcolor);
 340                     }
 341
 342                   if (in_glyph)
 343                     /* see if we have a top/bottom border */
 344                     {
 345                       /* top */
 346                       if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
 347                         /* we have a top border */
 348                         SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
 349
 350                       /* bottom */
 351                       if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
 352                         /* we have a bottom border */
 353                         SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
 354
 355                     }
 356                 }
 357
 358               SET_PIXEL(picture, dpixel, (c+x), (y+r));
 359             }
 360         }
 361     }
 362 }
 363
 364
 365 inline void draw_box(AVPicture *picture, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_color[3])
 366 {
 367   int i, j;
 368
 369   for (j = 0; (j < height); j++)
 370     for (i = 0; (i < width); i++)
 371       {
 372         SET_PIXEL(picture, yuv_color, (i+x), (y+j));
 373       }
 374
 375 }
 376
 377
 378
 379
 380 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 381 {
 382   ContextInfo *ci = (ContextInfo *) ctx;
 383   FT_Face face = ci->face;
 384   FT_GlyphSlot  slot = face->glyph;
 385   unsigned char *text = ci->text;
 386   unsigned char c;
 387   int x = 0, y = 0, i=0, size=0;
 388   unsigned char buff[MAXSIZE_TEXT];
 389   unsigned char tbuff[MAXSIZE_TEXT];
 390   time_t now = time(0);
 391   int str_w, str_w_max;
 392   FT_Vector pos[MAXSIZE_TEXT];
 393   FT_Vector delta;
 394
 395   if (ci->file)
 396     {
 397       int fd = open(ci->file, O_RDONLY);
 398
 399       if (fd < 0)
 400         {
 401           text = ci->text;
 402           perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
 403         }
 404       else
 405         {
 406           int l = read(fd, tbuff, sizeof(tbuff) - 1);
 407
 408           if (l >= 0)
 409             {
 410               tbuff[l] = 0;
 411               text = tbuff;
 412             }
 413           else
 414             {
 415               text = ci->text;
 416               perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
 417             }
 418           close(fd);
 419         }
 420     }
 421   else
 422     {
 423       text = ci->text;
 424     }
 425
 426   strftime(buff, sizeof(buff), text, localtime(&now));
 427
 428   text = buff;
 429
 430   size = strlen(text);
 431
 432
 433
 434
 435   /* measure string size and save glyphs position*/
 436   str_w = str_w_max = 0;
 437   x = ci->x;
 438   y = ci->y;
 439   for (i=0; i < size; i++)
 440     {
 441       c = text[i];
 442
 443       /* kerning */
 444       if ( (ci->use_kerning) && (i > 0) && (ci->glyphs_index[c]) )
 445         {
 446           FT_Get_Kerning( ci->face,
 447                           ci->glyphs_index[ text[i-1] ],
 448                           ci->glyphs_index[c],
 449                           ft_kerning_default,
 450                           &delta );
 451
 452           x += delta.x >> 6;
 453         }
 454
 455       if (( (x + ci->advance[ c ]) >= width ) || ( c == '\n' ))
 456         {
 457           str_w = width - ci->x - 1;
 458
 459           y += ci->text_height;
 460           x = ci->x;
 461         }
 462
 463
 464       /* save position */
 465       pos[i].x = x + ci->bitmap_left[c];
 466       pos[i].y = y - ci->bitmap_top[c] + ci->baseline;
 467
 468
 469       x += ci->advance[c];
 470
 471
 472       if (str_w > str_w_max)
 473         str_w_max = str_w;
 474
 475     }
 476
 477
 478
 479
 480   if (ci->bg)
 481     {
 482       /* Check if it doesn't pass the limits */
 483       if ( str_w_max + ci->x >= width )
 484         str_w_max = width - ci->x - 1;
 485       if ( y >= height )
 486         y = height - 1 - 2*ci->y;
 487
 488       /* Draw Background */
 489       draw_box( picture, ci->x, ci->y, str_w_max, y - ci->y, ci->bgcolor );
 490     }
 491
 492
 493
 494   /* Draw Glyphs */
 495   for (i=0; i < size; i++)
 496     {
 497       c = text[i];
 498
 499       if (
 500           ( (c == '_') && (text == ci->text) ) || /* skip '_' (consider as space)
 501                                                      IF text was specified in cmd line
 502                                                      (which doesn't like neasted quotes)  */
 503           ( c == '\n' ) /* Skip new line char, just go to new line */
 504           )
 505         continue;
 506
 507         /* now, draw to our target surface */
 508         draw_glyph( picture,
 509                     &(ci->bitmaps[ c ]),
 510                     pos[i].x,
 511                     pos[i].y,
 512                     width,
 513                     height,
 514                     ci->fgcolor,
 515                     ci->bgcolor,
 516                     ci->outline );
 517
 518       /* increment pen position */
 519       x += slot->advance.x >> 6;
 520     }
 521
 522
 523 }
 524