vhook/drawtext.c

   1 /*
   2  * drawtext.c: print text over the screen
   3  ******************************************************************
   4  * Options:
   5  * -f <filename>    font filename
   6  * -s <pixel_size>  font size in pixels
   7  * -b               print background
   8  * -o               outline glyphs (use the bg color)
   9  * -x <pos>         x position ( > 0)
  10  * -y <pos>         y position ( > 0)
  11  * -t <text>        text to print (will be passed to strftime())
  12  * -c <#RRGGBB>     foreground color ('internet' way)
  13  * -C <#RRGGBB>     background color ('internet' way)
  14  *
  15  ******************************************************************
  16  *
  17  * Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
  18  *
  19  * This library is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU Lesser General Public
  21  * License as published by the Free Software Foundation; either
  22  * version 2 of the License, or (at your option) any later version.
  23  *
  24  * This library is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  27  * Lesser General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU Lesser General Public
  30  * License along with this library; if not, write to the Free Software
  31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  */
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <fcntl.h>
  36 #include <stdarg.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <sys/time.h>
  40 #include <time.h>
  41
  42 #include "framehook.h"
  43
  44 #include <ft2build.h>
  45 #include FT_FREETYPE_H
  46
  47 #define RGB_TO_YUV(rgb_color, yuv_color) { \
  48     yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) +  16; \
  49     yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \
  50     yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \
  51 }
  52
  53 #define COPY_3(dst,src) { \
  54     dst[0]=src[0]; \
  55     dst[1]=src[1]; \
  56     dst[2]=src[2]; \
  57 }
  58
  59
  60
  61 #define SET_PIXEL(picture, yuv_color, x, y) { \
  62     picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
  63     picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
  64     picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
  65 }
  66
  67 #define GET_PIXEL(picture, yuv_color, x, y) { \
  68     yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
  69     yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
  70     yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
  71 }
  72
  73
  74 typedef struct {
  75   char *text;
  76   unsigned int x;
  77   unsigned int y;
  78   int bg;
  79   int outline;
  80   unsigned char bgcolor[3]; /* YUV */
  81   unsigned char fgcolor[3]; /* YUV */
  82   FT_Library ft_lib;
  83   FT_Face ft_face;
  84 } ContextInfo;
  85
  86
  87 void Release(void *ctx)
  88 {
  89     if (ctx)
  90         av_free(ctx);
  91 }
  92
  93
  94 int ParseColor(char *text, unsigned char yuv_color[3])
  95 {
  96   char tmp[3];
  97   unsigned char rgb_color[3];
  98   int i;
  99
 100   tmp[2] = '\0';
 101
 102   if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
 103     return -1;
 104
 105   for (i=0; i < 3; i++)
 106     {
 107       tmp[0] = text[i*2+1];
 108       tmp[1] = text[i*2+2];
 109
 110       rgb_color[i] = strtol(tmp, NULL, 16);
 111     }
 112
 113   RGB_TO_YUV(rgb_color, yuv_color);
 114
 115   printf("RGB=%d,%d,%d    YUV=%d,%d,%d\n",rgb_color[0],rgb_color[1],rgb_color[2],
 116          yuv_color[0],yuv_color[1],yuv_color[2]);
 117   return 0;
 118 }
 119
 120 int Configure(void **ctxp, int argc, char *argv[])
 121 {
 122     int c;
 123     int error;
 124     ContextInfo *ci=NULL;
 125     char *font=NULL;
 126     unsigned int size=16;
 127
 128     *ctxp = av_mallocz(sizeof(ContextInfo));
 129     ci = (ContextInfo *) *ctxp;
 130
 131     /* configure Context Info */
 132     ci->text = NULL;
 133     ci->x = ci->y = 0;
 134     ci->fgcolor[0]=255;
 135     ci->fgcolor[1]=128;
 136     ci->fgcolor[2]=128;
 137     ci->bgcolor[0]=0;
 138     ci->fgcolor[1]=128;
 139     ci->fgcolor[2]=128;
 140     ci->bg = 0;
 141     ci->outline = 0;
 142
 143     optind = 0;
 144     while ((c = getopt(argc, argv, "f:t:x:y:s:c:C:bo")) > 0) {
 145       switch (c) {
 146       case 'f':
 147         font = optarg;
 148         break;
 149       case 't':
 150         ci->text = av_strdup(optarg);
 151         break;
 152       case 'x':
 153         ci->x = (unsigned int) atoi(optarg);
 154         break;
 155       case 'y':
 156         ci->y = (unsigned int) atoi(optarg);
 157         break;
 158       case 's':
 159         size = (unsigned int) atoi(optarg);
 160         break;
 161       case 'c':
 162         if (ParseColor(optarg, ci->fgcolor) == -1)
 163           {
 164             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);
 165             return -1;
 166           }
 167         break;
 168       case 'C':
 169         if (ParseColor(optarg, ci->bgcolor) == -1)
 170           {
 171             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);
 172             return -1;
 173           }
 174         break;
 175       case 'b':
 176         ci->bg=1;
 177         break;
 178       case 'o':
 179         ci->outline=1;
 180         break;
 181       case '?':
 182         fprintf(stderr, "ERROR: Unrecognized argument '%s'\n", argv[optind]);
 183         return -1;
 184       }
 185     }
 186
 187     if (!ci->text)
 188       {
 189         fprintf(stderr,"ERROR: No text provided (-t text)\n");
 190         return -1;
 191       }
 192
 193     if (!font)
 194       {
 195         fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
 196         return -1;
 197       }
 198
 199     if ((error = FT_Init_FreeType(&(ci->ft_lib))) != 0)
 200       {
 201         fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
 202         return -1;
 203       }
 204
 205     if ((error = FT_New_Face( ci->ft_lib, font, 0, &(ci->ft_face) )) != 0)
 206       {
 207         fprintf(stderr,"ERROR: Could not load face: %s  (error# %d)\n",font, error);
 208         return -1;
 209       }
 210
 211     if ((error = FT_Set_Pixel_Sizes( ci->ft_face, 0, size)) != 0)
 212       {
 213         fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
 214         return -1;
 215       }
 216
 217     return 0;
 218 }
 219
 220
 221 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)
 222 {
 223   int r, c;
 224   int spixel, dpixel[3], in_glyph=0;
 225
 226   if (bitmap->pixel_mode == ft_pixel_mode_mono)
 227     {
 228       in_glyph = 0;
 229       for (r=0; (r < bitmap->rows) && (r+y < height); r++)
 230         {
 231           for (c=0; (c < bitmap->width) && (c+x < width); c++)
 232             {
 233               /* pixel in the picture (destination) */
 234               GET_PIXEL(picture, dpixel, (c+x), (y+r));
 235
 236               /* pixel in the glyph bitmap (source) */
 237               spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8));
 238
 239               if (spixel)
 240                 COPY_3(dpixel, yuv_fgcolor);
 241
 242               if (outline)
 243                 {
 244                   /* border detection: */
 245                   if ( (!in_glyph) && (spixel) )
 246                     /* left border detected */
 247                     {
 248                       in_glyph = 1;
 249                       /* draw left pixel border */
 250                       if (c-1 >= 0)
 251                         SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
 252                     }
 253                   else if ( (in_glyph) && (!spixel) )
 254                     /* right border detected */
 255                     {
 256                       in_glyph = 0;
 257                       /* 'draw' right pixel border */
 258                       COPY_3(dpixel, yuv_bgcolor);
 259                     }
 260                   else if (in_glyph)
 261                     /* see if we have a top/bottom border */
 262                     {
 263                       /* top */
 264                       if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
 265                         /* we have a top border */
 266                         SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
 267
 268                       /* bottom */
 269                       if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
 270                         /* we have a bottom border */
 271                         SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
 272
 273                     }
 274                 }
 275
 276               SET_PIXEL(picture, dpixel, (c+x), (y+r));
 277             }
 278         }
 279     }
 280 }
 281
 282
 283 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 284 {
 285   ContextInfo *ci = (ContextInfo *) ctx;
 286   FT_Face face = ci->ft_face;
 287   FT_GlyphSlot  slot = face->glyph;
 288   char *text = ci->text;
 289   int x = 0, y = 0, i=0, j=0, size=0, error;
 290   int str_w, str_h;
 291   char buff[1000];
 292   time_t now = time(0);
 293
 294   strftime(buff, sizeof(buff), text, localtime(&now));
 295
 296   text = buff;
 297
 298   size = strlen(text);
 299
 300   x = ci->x;
 301   y = ci->y;
 302
 303
 304   /* measure string size */
 305   str_w = str_h = 0;
 306   for (i=0; i < size; i++)
 307     {
 308       /* load glyph image into the slot (erase previous one) */
 309       error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
 310       if (error) continue;  /* ignore errors */
 311
 312       str_w += slot->advance.x >> 6;
 313
 314       if (slot->bitmap_top > str_h)
 315         str_h = slot->bitmap_top;
 316
 317     }
 318
 319
 320   if (ci->bg)
 321     /* draw background */
 322     for (j = 0; (j < str_h) && (j+y < height); j++)
 323       for (i = 0; (i < str_w) && (i+x < width); i++)
 324         {
 325           SET_PIXEL(picture, ci->bgcolor, (i+x), (y+j));
 326         }
 327
 328   /* Draw Glyphs */
 329   for (i=0; i < size; i++)
 330     {
 331       /* load glyph image into the slot (erase previous one) */
 332       error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
 333       if (error) continue;  /* ignore errors */
 334
 335       if (text[i] != '_') /* skip '_' (consider as space) */
 336         /* now, draw to our target surface */
 337
 338         draw_glyph( picture, &slot->bitmap,
 339                     x + slot->bitmap_left,
 340                     y - slot->bitmap_top + str_h,
 341                     width, height,
 342                     ci->fgcolor, ci->bgcolor,
 343                     ci->outline);
 344
 345       /* increment pen position */
 346       x += slot->advance.x >> 6;
 347     }
 348
 349
 350 }
 351