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ffmpeg / vhook / drawtext.c @ 00a3c8b8

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1
/*
2
 * drawtext.c: print text over the screen
3
 ******************************************************************************
4
 * Options:
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 * -f <filename>    font filename (MANDATORY!!!)
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 * -s <pixel_size>  font size in pixels [default 16]
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 * -b               print background
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 * -o               outline glyphs (use the bg color)
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 * -x <pos>         x position ( >= 0) [default 0]
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 * -y <pos>         y position ( >= 0) [default 0]
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 * -t <text>        text to print (will be passed to strftime())
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 *                  MANDATORY: will be used even when -T is used. 
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 *                  in this case, -t will be used if some error 
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 *                  occurs
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 * -T <filename>    file with the text (re-read every frame)
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 * -c <#RRGGBB>     foreground color ('internet' way) [default #ffffff]
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 * -C <#RRGGBB>     background color ('internet' way) [default #000000]
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 *
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 ******************************************************************************
20
 * Features:
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 * - True Type, Type1 and others via FreeType2 library
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 * - Font kerning (better output)
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 * - Line Wrap (if the text doesn't fit, the next char go to the next line)
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 * - Background box
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 * - Outline
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 ******************************************************************************
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 * Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
28
 *
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 * This library is free software; you can redistribute it and/or
30
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
35
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
43

    
44
#define MAXSIZE_TEXT 1024
45

    
46
#include "framehook.h"
47

    
48
#include <stdio.h>
49
#include <stdlib.h>
50
#include <fcntl.h>
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#include <stdarg.h>
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#include <string.h>
53
#include <unistd.h>
54
#undef time
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#include <sys/time.h>
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#include <time.h>
57

    
58
#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
61

    
62
#define RGB_TO_YUV(rgb_color, yuv_color) { \
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    yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) +  16; \
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    yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \
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    yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \
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}
67

    
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#define COPY_3(dst,src) { \
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    dst[0]=src[0]; \
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    dst[1]=src[1]; \
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    dst[2]=src[2]; \
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}
73

    
74

    
75

    
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#define SET_PIXEL(picture, yuv_color, x, y) { \
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    picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
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    picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
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    picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
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}
81

    
82
#define GET_PIXEL(picture, yuv_color, x, y) { \
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    yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
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    yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
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    yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
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}
87

    
88

    
89
typedef struct {
90
  unsigned char *text;
91
  unsigned char *file;
92
  unsigned int x;
93
  unsigned int y;
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  int bg;
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  int outline;
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  unsigned char bgcolor[3]; /* YUV */
97
  unsigned char fgcolor[3]; /* YUV */
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  FT_Library library;
99
  FT_Face    face;
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  FT_Glyph   glyphs[ 255 ]; 
101
  FT_Bitmap  bitmaps[ 255 ];
102
  int        advance[ 255 ];
103
  int        bitmap_left[ 255 ];
104
  int        bitmap_top[ 255 ];
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  unsigned int glyphs_index[ 255 ];
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  int        text_height;
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  int        baseline;
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  int use_kerning;
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} ContextInfo;
110

    
111

    
112
void Release(void *ctx)
113
{
114
    if (ctx)
115
        av_free(ctx);
116
}
117

    
118

    
119
int ParseColor(char *text, unsigned char yuv_color[3])
120
{
121
  char tmp[3];
122
  unsigned char rgb_color[3];
123
  int i;
124

    
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  tmp[2] = '\0';
126

    
127
  if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
128
    return -1;
129

    
130
  for (i=0; i < 3; i++)
131
    {
132
      tmp[0] = text[i*2+1];
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      tmp[1] = text[i*2+2];
134

    
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      rgb_color[i] = strtol(tmp, NULL, 16);
136
    }
137

    
138
  RGB_TO_YUV(rgb_color, yuv_color);
139

    
140
  return 0;
141
}
142

    
143
int Configure(void **ctxp, int argc, char *argv[])
144
{
145
    int c;
146
    int error;
147
    ContextInfo *ci=NULL;
148
    char *font=NULL;
149
    unsigned int size=16;
150
    FT_BBox bbox;
151
    int yMax, yMin;
152
    *ctxp = av_mallocz(sizeof(ContextInfo));
153
    ci = (ContextInfo *) *ctxp;
154

    
155
    /* configure Context Info */
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    ci->text = NULL;
157
    ci->file = NULL;
158
    ci->x = ci->y = 0;
159
    ci->fgcolor[0]=255;
160
    ci->fgcolor[1]=128;
161
    ci->fgcolor[2]=128;
162
    ci->bgcolor[0]=0;
163
    ci->fgcolor[1]=128;
164
    ci->fgcolor[2]=128;
165
    ci->bg = 0;
166
    ci->outline = 0;
167
    ci->text_height = 0;
168

    
169
    optind = 0;
170
    while ((c = getopt(argc, argv, "f:t:T:x:y:s:c:C:bo")) > 0) {
171
      switch (c) {
172
      case 'f':
173
        font = optarg;
174
        break;
175
      case 't':
176
        ci->text = av_strdup(optarg);
177
        break;
178
      case 'T':
179
        ci->file = av_strdup(optarg);
180
        break;
181
      case 'x':
182
        ci->x = (unsigned int) atoi(optarg);
183
        break;
184
      case 'y':
185
        ci->y = (unsigned int) atoi(optarg);
186
        break;
187
      case 's':
188
        size = (unsigned int) atoi(optarg);
189
        break;
190
      case 'c':
191
        if (ParseColor(optarg, ci->fgcolor) == -1)
192
          {
193
            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);
194
            return -1;
195
          }
196
        break;
197
      case 'C':
198
        if (ParseColor(optarg, ci->bgcolor) == -1)
199
          {
200
            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);
201
            return -1;
202
          }
203
        break;
204
      case 'b':
205
        ci->bg=1;
206
        break;
207
      case 'o':
208
        ci->outline=1;
209
        break;
210
      case '?':
211
        fprintf(stderr, "ERROR: Unrecognized argument '%s'\n", argv[optind]);
212
        return -1;
213
      }
214
    }
215

    
216
    if (!ci->text) 
217
      {
218
        fprintf(stderr,"ERROR: No text provided (-t text)\n");
219
        return -1;
220
      }
221

    
222
    if (ci->file)
223
      {
224
        FILE *fp;
225
        if ((fp=fopen(ci->file, "r")) == NULL)
226
          {
227
            perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
228
          }
229
        else
230
          {
231
            fclose(fp);
232
          }
233
      }
234

    
235
    if (!font)
236
      {
237
        fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
238
        return -1;
239
      }
240

    
241
    if ((error = FT_Init_FreeType(&(ci->library))) != 0)
242
      {
243
        fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
244
        return -1;
245
      }
246

    
247
    if ((error = FT_New_Face( ci->library, font, 0, &(ci->face) )) != 0)
248
      {
249
        fprintf(stderr,"ERROR: Could not load face: %s  (error# %d)\n",font, error);
250
        return -1;
251
      }
252
    
253
    if ((error = FT_Set_Pixel_Sizes( ci->face, 0, size)) != 0)
254
      {
255
        fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
256
        return -1;
257
      }
258

    
259
    ci->use_kerning = FT_HAS_KERNING(ci->face);
260

    
261
    /* load and cache glyphs */
262
    yMax = -32000;
263
    yMin =  32000;
264
    for (c=0; c < 256; c++)
265
      {
266
        /* Load char */
267
        error = FT_Load_Char( ci->face, (unsigned char) c, FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
268
        if (error) continue;  /* ignore errors */
269
   
270
        /* Save bitmap */
271
        ci->bitmaps[c] = ci->face->glyph->bitmap;
272
        /* Save bitmap left */
273
        ci->bitmap_left[c] = ci->face->glyph->bitmap_left;
274
        /* Save bitmap top */
275
        ci->bitmap_top[c] = ci->face->glyph->bitmap_top;
276

    
277
        /* Save advance */
278
        ci->advance[c] = ci->face->glyph->advance.x >> 6;
279

    
280
        /* Save glyph */
281
        error = FT_Get_Glyph( ci->face->glyph, &(ci->glyphs[c]) );
282
        /* Save glyph index */
283
        ci->glyphs_index[c] = FT_Get_Char_Index( ci->face, (unsigned char) c );        
284

    
285
        /* Measure text height to calculate text_height (or the maximum text height) */
286
        FT_Glyph_Get_CBox( ci->glyphs[ c ], ft_glyph_bbox_pixels, &bbox );
287
        if (bbox.yMax > yMax)
288
          yMax = bbox.yMax;
289
        if (bbox.yMin < yMin)
290
          yMin = bbox.yMin;
291
        
292
      }
293

    
294
    ci->text_height = yMax - yMin;
295
    ci->baseline = yMax;
296

    
297
    return 0;
298
}
299

    
300

    
301

    
302

    
303
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)
304
{
305
  int r, c;
306
  int spixel, dpixel[3], in_glyph=0;
307

    
308
  if (bitmap->pixel_mode == ft_pixel_mode_mono)
309
    {
310
      in_glyph = 0;
311
      for (r=0; (r < bitmap->rows) && (r+y < height); r++)
312
        {
313
          for (c=0; (c < bitmap->width) && (c+x < width); c++)
314
            {
315
              /* pixel in the picture (destination) */
316
              GET_PIXEL(picture, dpixel, (c+x), (y+r));
317

    
318
              /* pixel in the glyph bitmap (source) */
319
              spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8)); 
320
              
321
              if (spixel) 
322
                COPY_3(dpixel, yuv_fgcolor);
323
              
324
              if (outline)
325
                {
326
                  /* border detection: */              
327
                  if ( (!in_glyph) && (spixel) )
328
                    /* left border detected */
329
                    {
330
                      in_glyph = 1;
331
                      /* draw left pixel border */
332
                      if (c-1 >= 0)
333
                        SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
334
                    }
335
                  else if ( (in_glyph) && (!spixel) )
336
                    /* right border detected */
337
                    {
338
                      in_glyph = 0;
339
                      /* 'draw' right pixel border */
340
                      COPY_3(dpixel, yuv_bgcolor);
341
                    }
342
                  
343
                  if (in_glyph) 
344
                    /* see if we have a top/bottom border */
345
                    {
346
                      /* top */
347
                      if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
348
                        /* we have a top border */
349
                        SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
350

    
351
                      /* bottom */
352
                      if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
353
                        /* we have a bottom border */
354
                        SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
355
                      
356
                    }
357
                }
358
                  
359
              SET_PIXEL(picture, dpixel, (c+x), (y+r));
360
            }
361
        }
362
    }
363
}
364

    
365

    
366
inline void draw_box(AVPicture *picture, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_color[3])
367
{
368
  int i, j;
369

    
370
  for (j = 0; (j < height); j++)
371
    for (i = 0; (i < width); i++) 
372
      {        
373
        SET_PIXEL(picture, yuv_color, (i+x), (y+j));
374
      }
375
  
376
}
377

    
378

    
379

    
380

    
381
void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
382
{
383
  ContextInfo *ci = (ContextInfo *) ctx;
384
  FT_Face face = ci->face;
385
  FT_GlyphSlot  slot = face->glyph;  
386
  unsigned char *text = ci->text;
387
  unsigned char c;
388
  int x = 0, y = 0, i=0, size=0;
389
  unsigned char buff[MAXSIZE_TEXT];
390
  unsigned char tbuff[MAXSIZE_TEXT];
391
  time_t now = time(0);
392
  int str_w, str_w_max;
393
  FT_Vector pos[MAXSIZE_TEXT];  
394
  FT_Vector delta;
395

    
396
  if (ci->file) 
397
    {
398
      int fd = open(ci->file, O_RDONLY);
399
      
400
      if (fd < 0) 
401
        {
402
          text = ci->text;
403
          perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
404
        } 
405
      else 
406
        {
407
          int l = read(fd, tbuff, sizeof(tbuff) - 1);
408
          
409
          if (l >= 0) 
410
            {
411
              tbuff[l] = 0;
412
              text = tbuff;
413
            } 
414
          else 
415
            {
416
              text = ci->text;
417
              perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
418
            }
419
          close(fd);
420
        }
421
    }
422
  else
423
    {
424
      text = ci->text;
425
    }
426

    
427
  strftime(buff, sizeof(buff), text, localtime(&now));
428

    
429
  text = buff;
430

    
431
  size = strlen(text);
432
  
433

    
434

    
435

    
436
  /* measure string size and save glyphs position*/
437
  str_w = str_w_max = 0;
438
  x = ci->x; 
439
  y = ci->y;
440
  for (i=0; i < size; i++)
441
    {
442
      c = text[i];
443

    
444
      /* kerning */
445
      if ( (ci->use_kerning) && (i > 0) && (ci->glyphs_index[c]) )
446
        {
447
          FT_Get_Kerning( ci->face, 
448
                          ci->glyphs_index[ text[i-1] ], 
449
                          ci->glyphs_index[c],
450
                          ft_kerning_default, 
451
                          &delta );
452
          
453
          x += delta.x >> 6;
454
        }
455
      
456
      if (( (x + ci->advance[ c ]) >= width ) || ( c == '\n' ))
457
        {
458
          str_w = width - ci->x - 1;
459

    
460
          y += ci->text_height;
461
          x = ci->x;
462
        }
463

    
464

    
465
      /* save position */
466
      pos[i].x = x + ci->bitmap_left[c];
467
      pos[i].y = y - ci->bitmap_top[c] + ci->baseline;
468

    
469

    
470
      x += ci->advance[c];
471

    
472

    
473
      if (str_w > str_w_max)
474
        str_w_max = str_w;
475

    
476
    }
477

    
478
  
479

    
480

    
481
  if (ci->bg)
482
    {
483
      /* Check if it doesn't pass the limits */
484
      if ( str_w_max + ci->x >= width )
485
        str_w_max = width - ci->x - 1;
486
      if ( y >= height )
487
        y = height - 1 - 2*ci->y;
488

    
489
      /* Draw Background */
490
      draw_box( picture, ci->x, ci->y, str_w_max, y - ci->y, ci->bgcolor );      
491
    }
492

    
493

    
494

    
495
  /* Draw Glyphs */
496
  for (i=0; i < size; i++)
497
    {
498
      c = text[i];
499

    
500
      if (
501
          ( (c == '_') && (text == ci->text) ) || /* skip '_' (consider as space) 
502
                                                     IF text was specified in cmd line 
503
                                                     (which doesn't like neasted quotes)  */
504
          ( c == '\n' ) /* Skip new line char, just go to new line */
505
          )
506
        continue;
507

    
508
        /* now, draw to our target surface */
509
        draw_glyph( picture, 
510
                    &(ci->bitmaps[ c ]),
511
                    pos[i].x,
512
                    pos[i].y,
513
                    width, 
514
                    height,
515
                    ci->fgcolor,
516
                    ci->bgcolor,
517
                    ci->outline );
518
                    
519
      /* increment pen position */
520
      x += slot->advance.x >> 6;
521
    }
522

    
523

    
524
}
525