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 file is part of FFmpeg.
  30  *
  31  * FFmpeg is free software; you can redistribute it and/or
  32  * modify it under the terms of the GNU Lesser General Public
  33  * License as published by the Free Software Foundation; either
  34  * version 2.1 of the License, or (at your option) any later version.
  35  *
  36  * FFmpeg is distributed in the hope that it will be useful,
  37  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  38  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  39  * Lesser General Public License for more details.
  40  *
  41  * You should have received a copy of the GNU Lesser General Public
  42  * License along with FFmpeg; if not, write to the Free Software
  43  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  44  */
  45
  46 #define MAXSIZE_TEXT 1024
  47
  48 #include "libavformat/framehook.h"
  49
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <fcntl.h>
  53 #include <stdarg.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56 #undef time
  57 #include <sys/time.h>
  58 #include <time.h>
  59
  60 #include <ft2build.h>
  61 #include FT_FREETYPE_H
  62 #include FT_GLYPH_H
  63
  64 #define SCALEBITS 10
  65 #define ONE_HALF  (1 << (SCALEBITS - 1))
  66 #define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
  67
  68 #define RGB_TO_YUV(rgb_color, yuv_color) do { \
  69   yuv_color[0] = (FIX(0.29900)    * rgb_color[0] + FIX(0.58700) * rgb_color[1] + FIX(0.11400) * rgb_color[2] + ONE_HALF) >> SCALEBITS; \
  70   yuv_color[2] = ((FIX(0.50000)   * rgb_color[0] - FIX(0.41869) * rgb_color[1] - FIX(0.08131) * rgb_color[2] + ONE_HALF - 1) >> SCALEBITS) + 128; \
  71   yuv_color[1] = ((- FIX(0.16874) * rgb_color[0] - FIX(0.33126) * rgb_color[1] + FIX(0.50000) * rgb_color[2] + ONE_HALF - 1) >> SCALEBITS) + 128; \
  72 } while (0)
  73
  74 #define COPY_3(dst,src) { \
  75     dst[0]=src[0]; \
  76     dst[1]=src[1]; \
  77     dst[2]=src[2]; \
  78 }
  79
  80
  81
  82 #define SET_PIXEL(picture, yuv_color, x, y) { \
  83     picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
  84     picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
  85     picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
  86 }
  87
  88 #define GET_PIXEL(picture, yuv_color, x, y) { \
  89     yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
  90     yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
  91     yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
  92 }
  93
  94
  95 typedef struct {
  96   unsigned char *text;
  97   char *file;
  98   unsigned int x;
  99   unsigned int y;
 100   int bg;
 101   int outline;
 102   unsigned char bgcolor[3]; /* YUV */
 103   unsigned char fgcolor[3]; /* YUV */
 104   FT_Library library;
 105   FT_Face    face;
 106   FT_Glyph   glyphs[ 255 ];
 107   FT_Bitmap  bitmaps[ 255 ];
 108   int        advance[ 255 ];
 109   int        bitmap_left[ 255 ];
 110   int        bitmap_top[ 255 ];
 111   unsigned int glyphs_index[ 255 ];
 112   int        text_height;
 113   int        baseline;
 114   int use_kerning;
 115 } ContextInfo;
 116
 117
 118 void Release(void *ctx)
 119 {
 120     if (ctx)
 121         av_free(ctx);
 122 }
 123
 124
 125 static int ParseColor(char *text, unsigned char yuv_color[3])
 126 {
 127   char tmp[3];
 128   unsigned char rgb_color[3];
 129   int i;
 130
 131   tmp[2] = '\0';
 132
 133   if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
 134     return -1;
 135
 136   for (i=0; i < 3; i++)
 137     {
 138       tmp[0] = text[i*2+1];
 139       tmp[1] = text[i*2+2];
 140
 141       rgb_color[i] = strtol(tmp, NULL, 16);
 142     }
 143
 144   RGB_TO_YUV(rgb_color, yuv_color);
 145
 146   return 0;
 147 }
 148
 149 int Configure(void **ctxp, int argc, char *argv[])
 150 {
 151     int c;
 152     int error;
 153     ContextInfo *ci=NULL;
 154     char *font=NULL;
 155     unsigned int size=16;
 156     FT_BBox bbox;
 157     int yMax, yMin;
 158     *ctxp = av_mallocz(sizeof(ContextInfo));
 159     ci = (ContextInfo *) *ctxp;
 160
 161     /* configure Context Info */
 162     ci->text = NULL;
 163     ci->file = NULL;
 164     ci->x = ci->y = 0;
 165     ci->fgcolor[0]=255;
 166     ci->fgcolor[1]=128;
 167     ci->fgcolor[2]=128;
 168     ci->bgcolor[0]=0;
 169     ci->fgcolor[1]=128;
 170     ci->fgcolor[2]=128;
 171     ci->bg = 0;
 172     ci->outline = 0;
 173     ci->text_height = 0;
 174
 175     optind = 1;
 176     while ((c = getopt(argc, argv, "f:t:T:x:y:s:c:C:bo")) > 0) {
 177       switch (c) {
 178       case 'f':
 179         font = optarg;
 180         break;
 181       case 't':
 182         ci->text = av_strdup(optarg);
 183         break;
 184       case 'T':
 185         ci->file = av_strdup(optarg);
 186         break;
 187       case 'x':
 188         ci->x = (unsigned int) atoi(optarg);
 189         break;
 190       case 'y':
 191         ci->y = (unsigned int) atoi(optarg);
 192         break;
 193       case 's':
 194         size = (unsigned int) atoi(optarg);
 195         break;
 196       case 'c':
 197         if (ParseColor(optarg, ci->fgcolor) == -1)
 198           {
 199             av_log(NULL, AV_LOG_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 'C':
 204         if (ParseColor(optarg, ci->bgcolor) == -1)
 205           {
 206             av_log(NULL, AV_LOG_ERROR, "Invalid background color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -C #ffffff (for white background)\n", optarg);
 207             return -1;
 208           }
 209         break;
 210       case 'b':
 211         ci->bg=1;
 212         break;
 213       case 'o':
 214         ci->outline=1;
 215         break;
 216       case '?':
 217         av_log(NULL, AV_LOG_ERROR, "Unrecognized argument '%s'\n", argv[optind]);
 218         return -1;
 219       }
 220     }
 221
 222     if (!ci->text)
 223       {
 224         av_log(NULL, AV_LOG_ERROR, "No text provided (-t text)\n");
 225         return -1;
 226       }
 227
 228     if (ci->file)
 229       {
 230         FILE *fp;
 231         if ((fp=fopen(ci->file, "r")) == NULL)
 232           {
 233             av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be opened. Using text provided with -t switch: %s", strerror(errno));
 234           }
 235         else
 236           {
 237             fclose(fp);
 238           }
 239       }
 240
 241     if (!font)
 242       {
 243         av_log(NULL, AV_LOG_ERROR, "No font file provided! (-f filename)\n");
 244         return -1;
 245       }
 246
 247     if ((error = FT_Init_FreeType(&(ci->library))) != 0)
 248       {
 249         av_log(NULL, AV_LOG_ERROR, "Could not load FreeType (error# %d).\n", error);
 250         return -1;
 251       }
 252
 253     if ((error = FT_New_Face( ci->library, font, 0, &(ci->face) )) != 0)
 254       {
 255         av_log(NULL, AV_LOG_ERROR, "Could not load face: %s  (error# %d).\n", font, error);
 256         return -1;
 257       }
 258
 259     if ((error = FT_Set_Pixel_Sizes( ci->face, 0, size)) != 0)
 260       {
 261         av_log(NULL, AV_LOG_ERROR, "Could not set font size to %d pixels (error# %d).\n", size, error);
 262         return -1;
 263       }
 264
 265     ci->use_kerning = FT_HAS_KERNING(ci->face);
 266
 267     /* load and cache glyphs */
 268     yMax = -32000;
 269     yMin =  32000;
 270     for (c=0; c < 256; c++)
 271       {
 272         /* Load char */
 273         error = FT_Load_Char( ci->face, (unsigned char) c, FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
 274         if (error) continue;  /* ignore errors */
 275
 276         /* Save bitmap */
 277         ci->bitmaps[c] = ci->face->glyph->bitmap;
 278         /* Save bitmap left */
 279         ci->bitmap_left[c] = ci->face->glyph->bitmap_left;
 280         /* Save bitmap top */
 281         ci->bitmap_top[c] = ci->face->glyph->bitmap_top;
 282
 283         /* Save advance */
 284         ci->advance[c] = ci->face->glyph->advance.x >> 6;
 285
 286         /* Save glyph */
 287         error = FT_Get_Glyph( ci->face->glyph, &(ci->glyphs[c]) );
 288         /* Save glyph index */
 289         ci->glyphs_index[c] = FT_Get_Char_Index( ci->face, (unsigned char) c );
 290
 291         /* Measure text height to calculate text_height (or the maximum text height) */
 292         FT_Glyph_Get_CBox( ci->glyphs[ c ], ft_glyph_bbox_pixels, &bbox );
 293         if (bbox.yMax > yMax)
 294           yMax = bbox.yMax;
 295         if (bbox.yMin < yMin)
 296           yMin = bbox.yMin;
 297
 298       }
 299
 300     ci->text_height = yMax - yMin;
 301     ci->baseline = yMax;
 302
 303     return 0;
 304 }
 305
 306
 307
 308
 309 static 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)
 310 {
 311   int r, c;
 312   int spixel, dpixel[3], in_glyph=0;
 313
 314   if (bitmap->pixel_mode == ft_pixel_mode_mono)
 315     {
 316       in_glyph = 0;
 317       for (r=0; (r < bitmap->rows) && (r+y < height); r++)
 318         {
 319           for (c=0; (c < bitmap->width) && (c+x < width); c++)
 320             {
 321               /* pixel in the picture (destination) */
 322               GET_PIXEL(picture, dpixel, (c+x), (y+r));
 323
 324               /* pixel in the glyph bitmap (source) */
 325               spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8));
 326
 327               if (spixel)
 328                 COPY_3(dpixel, yuv_fgcolor);
 329
 330               if (outline)
 331                 {
 332                   /* border detection: */
 333                   if ( (!in_glyph) && (spixel) )
 334                     /* left border detected */
 335                     {
 336                       in_glyph = 1;
 337                       /* draw left pixel border */
 338                       if (c-1 >= 0)
 339                         SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
 340                     }
 341                   else if ( (in_glyph) && (!spixel) )
 342                     /* right border detected */
 343                     {
 344                       in_glyph = 0;
 345                       /* 'draw' right pixel border */
 346                       COPY_3(dpixel, yuv_bgcolor);
 347                     }
 348
 349                   if (in_glyph)
 350                     /* see if we have a top/bottom border */
 351                     {
 352                       /* top */
 353                       if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
 354                         /* we have a top border */
 355                         SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
 356
 357                       /* bottom */
 358                       if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
 359                         /* we have a bottom border */
 360                         SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
 361
 362                     }
 363                 }
 364
 365               SET_PIXEL(picture, dpixel, (c+x), (y+r));
 366             }
 367         }
 368     }
 369 }
 370
 371
 372 static inline void draw_box(AVPicture *picture, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_color[3])
 373 {
 374   int i, j;
 375
 376   for (j = 0; (j < height); j++)
 377     for (i = 0; (i < width); i++)
 378       {
 379         SET_PIXEL(picture, yuv_color, (i+x), (y+j));
 380       }
 381
 382 }
 383
 384
 385
 386
 387 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 388 {
 389   ContextInfo *ci = (ContextInfo *) ctx;
 390   FT_Face face = ci->face;
 391   FT_GlyphSlot  slot = face->glyph;
 392   unsigned char *text = ci->text;
 393   unsigned char c;
 394   int x = 0, y = 0, i=0, size=0;
 395   unsigned char buff[MAXSIZE_TEXT];
 396   unsigned char tbuff[MAXSIZE_TEXT];
 397   time_t now = time(0);
 398   int str_w, str_w_max;
 399   FT_Vector pos[MAXSIZE_TEXT];
 400   FT_Vector delta;
 401
 402   if (ci->file)
 403     {
 404       int fd = open(ci->file, O_RDONLY);
 405
 406       if (fd < 0)
 407         {
 408           text = ci->text;
 409           av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be opened. Using text provided with -t switch: %s", strerror(errno));
 410         }
 411       else
 412         {
 413           int l = read(fd, tbuff, sizeof(tbuff) - 1);
 414
 415           if (l >= 0)
 416             {
 417               tbuff[l] = 0;
 418               text = tbuff;
 419             }
 420           else
 421             {
 422               text = ci->text;
 423               av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be read. Using text provided with -t switch: %s", strerror(errno));
 424             }
 425           close(fd);
 426         }
 427     }
 428   else
 429     {
 430       text = ci->text;
 431     }
 432
 433   strftime(buff, sizeof(buff), text, localtime(&now));
 434
 435   text = buff;
 436
 437   size = strlen(text);
 438
 439
 440
 441
 442   /* measure string size and save glyphs position*/
 443   str_w = str_w_max = 0;
 444   x = ci->x;
 445   y = ci->y;
 446   for (i=0; i < size; i++)
 447     {
 448       c = text[i];
 449
 450       /* kerning */
 451       if ( (ci->use_kerning) && (i > 0) && (ci->glyphs_index[c]) )
 452         {
 453           FT_Get_Kerning( ci->face,
 454                           ci->glyphs_index[ text[i-1] ],
 455                           ci->glyphs_index[c],
 456                           ft_kerning_default,
 457                           &delta );
 458
 459           x += delta.x >> 6;
 460         }
 461
 462       if (( (x + ci->advance[ c ]) >= width ) || ( c == '\n' ))
 463         {
 464           str_w = width - ci->x - 1;
 465
 466           y += ci->text_height;
 467           x = ci->x;
 468         }
 469
 470
 471       /* save position */
 472       pos[i].x = x + ci->bitmap_left[c];
 473       pos[i].y = y - ci->bitmap_top[c] + ci->baseline;
 474
 475
 476       x += ci->advance[c];
 477
 478
 479       if (str_w > str_w_max)
 480         str_w_max = str_w;
 481
 482     }
 483
 484
 485
 486
 487   if (ci->bg)
 488     {
 489       /* Check if it doesn't pass the limits */
 490       if ( str_w_max + ci->x >= width )
 491         str_w_max = width - ci->x - 1;
 492       if ( y >= height )
 493         y = height - 1 - 2*ci->y;
 494
 495       /* Draw Background */
 496       draw_box( picture, ci->x, ci->y, str_w_max, y - ci->y, ci->bgcolor );
 497     }
 498
 499
 500
 501   /* Draw Glyphs */
 502   for (i=0; i < size; i++)
 503     {
 504       c = text[i];
 505
 506       if (
 507           ( (c == '_') && (text == ci->text) ) || /* skip '_' (consider as space)
 508                                                      IF text was specified in cmd line
 509                                                      (which doesn't like nested quotes)  */
 510           ( c == '\n' ) /* Skip new line char, just go to new line */
 511           )
 512         continue;
 513
 514         /* now, draw to our target surface */
 515         draw_glyph( picture,
 516                     &(ci->bitmaps[ c ]),
 517                     pos[i].x,
 518                     pos[i].y,
 519                     width,
 520                     height,
 521                     ci->fgcolor,
 522                     ci->bgcolor,
 523                     ci->outline );
 524
 525       /* increment pen position */
 526       x += slot->advance.x >> 6;
 527     }
 528
 529
 530 }
 531