00001 /* 00002 * drawtext.c: print text over the screen 00003 ****************************************************************************** 00004 * Options: 00005 * -f <filename> font filename (MANDATORY!!!) 00006 * -s <pixel_size> font size in pixels [default 16] 00007 * -b print background 00008 * -o outline glyphs (use the bg color) 00009 * -x <pos> x position ( >= 0) [default 0] 00010 * -y <pos> y position ( >= 0) [default 0] 00011 * -t <text> text to print (will be passed to strftime()) 00012 * MANDATORY: will be used even when -T is used. 00013 * in this case, -t will be used if some error 00014 * occurs 00015 * -T <filename> file with the text (re-read every frame) 00016 * -c <#RRGGBB> foreground color ('internet' way) [default #ffffff] 00017 * -C <#RRGGBB> background color ('internet' way) [default #000000] 00018 * 00019 ****************************************************************************** 00020 * Features: 00021 * - True Type, Type1 and others via FreeType2 library 00022 * - Font kerning (better output) 00023 * - Line Wrap (if the text doesn't fit, the next char go to the next line) 00024 * - Background box 00025 * - Outline 00026 ****************************************************************************** 00027 * Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br> 00028 * 00029 * This file is part of FFmpeg. 00030 * 00031 * FFmpeg is free software; you can redistribute it and/or 00032 * modify it under the terms of the GNU Lesser General Public 00033 * License as published by the Free Software Foundation; either 00034 * version 2.1 of the License, or (at your option) any later version. 00035 * 00036 * FFmpeg is distributed in the hope that it will be useful, 00037 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00038 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00039 * Lesser General Public License for more details. 00040 * 00041 * You should have received a copy of the GNU Lesser General Public 00042 * License along with FFmpeg; if not, write to the Free Software 00043 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00044 */ 00045 00046 #define MAXSIZE_TEXT 1024 00047 00048 #include "libavformat/framehook.h" 00049 00050 #include <stdio.h> 00051 #include <stdlib.h> 00052 #include <fcntl.h> 00053 #include <stdarg.h> 00054 #include <string.h> 00055 #include <unistd.h> 00056 #undef time 00057 #include <sys/time.h> 00058 #include <time.h> 00059 00060 #include <ft2build.h> 00061 #include FT_FREETYPE_H 00062 #include FT_GLYPH_H 00063 00064 #define SCALEBITS 10 00065 #define ONE_HALF (1 << (SCALEBITS - 1)) 00066 #define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5)) 00067 00068 #define RGB_TO_YUV(rgb_color, yuv_color) do { \ 00069 yuv_color[0] = (FIX(0.29900) * rgb_color[0] + FIX(0.58700) * rgb_color[1] + FIX(0.11400) * rgb_color[2] + ONE_HALF) >> SCALEBITS; \ 00070 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; \ 00071 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; \ 00072 } while (0) 00073 00074 #define COPY_3(dst,src) { \ 00075 dst[0]=src[0]; \ 00076 dst[1]=src[1]; \ 00077 dst[2]=src[2]; \ 00078 } 00079 00080 00081 00082 #define SET_PIXEL(picture, yuv_color, x, y) { \ 00083 picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \ 00084 picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \ 00085 picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \ 00086 } 00087 00088 #define GET_PIXEL(picture, yuv_color, x, y) { \ 00089 yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \ 00090 yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \ 00091 yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \ 00092 } 00093 00094 00095 typedef struct { 00096 unsigned char *text; 00097 char *file; 00098 unsigned int x; 00099 unsigned int y; 00100 int bg; 00101 int outline; 00102 unsigned char bgcolor[3]; /* YUV */ 00103 unsigned char fgcolor[3]; /* YUV */ 00104 FT_Library library; 00105 FT_Face face; 00106 FT_Glyph glyphs[ 255 ]; 00107 FT_Bitmap bitmaps[ 255 ]; 00108 int advance[ 255 ]; 00109 int bitmap_left[ 255 ]; 00110 int bitmap_top[ 255 ]; 00111 unsigned int glyphs_index[ 255 ]; 00112 int text_height; 00113 int baseline; 00114 int use_kerning; 00115 } ContextInfo; 00116 00117 00118 void Release(void *ctx) 00119 { 00120 if (ctx) 00121 av_free(ctx); 00122 } 00123 00124 00125 static int ParseColor(char *text, unsigned char yuv_color[3]) 00126 { 00127 char tmp[3]; 00128 unsigned char rgb_color[3]; 00129 int i; 00130 00131 tmp[2] = '0円'; 00132 00133 if ((!text) || (strlen(text) != 7) || (text[0] != '#') ) 00134 return -1; 00135 00136 for (i=0; i < 3; i++) 00137 { 00138 tmp[0] = text[i*2+1]; 00139 tmp[1] = text[i*2+2]; 00140 00141 rgb_color[i] = strtol(tmp, NULL, 16); 00142 } 00143 00144 RGB_TO_YUV(rgb_color, yuv_color); 00145 00146 return 0; 00147 } 00148 00149 int Configure(void **ctxp, int argc, char *argv[]) 00150 { 00151 int c; 00152 int error; 00153 ContextInfo *ci=NULL; 00154 char *font=NULL; 00155 unsigned int size=16; 00156 FT_BBox bbox; 00157 int yMax, yMin; 00158 *ctxp = av_mallocz(sizeof(ContextInfo)); 00159 ci = (ContextInfo *) *ctxp; 00160 00161 /* configure Context Info */ 00162 ci->text = NULL; 00163 ci->file = NULL; 00164 ci->x = ci->y = 0; 00165 ci->fgcolor[0]=255; 00166 ci->fgcolor[1]=128; 00167 ci->fgcolor[2]=128; 00168 ci->bgcolor[0]=0; 00169 ci->fgcolor[1]=128; 00170 ci->fgcolor[2]=128; 00171 ci->bg = 0; 00172 ci->outline = 0; 00173 ci->text_height = 0; 00174 00175 optind = 1; 00176 while ((c = getopt(argc, argv, "f:t:T:x:y:s:c:C:bo")) > 0) { 00177 switch (c) { 00178 case 'f': 00179 font = optarg; 00180 break; 00181 case 't': 00182 ci->text = av_strdup(optarg); 00183 break; 00184 case 'T': 00185 ci->file = av_strdup(optarg); 00186 break; 00187 case 'x': 00188 ci->x = (unsigned int) atoi(optarg); 00189 break; 00190 case 'y': 00191 ci->y = (unsigned int) atoi(optarg); 00192 break; 00193 case 's': 00194 size = (unsigned int) atoi(optarg); 00195 break; 00196 case 'c': 00197 if (ParseColor(optarg, ci->fgcolor) == -1) 00198 { 00199 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); 00200 return -1; 00201 } 00202 break; 00203 case 'C': 00204 if (ParseColor(optarg, ci->bgcolor) == -1) 00205 { 00206 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); 00207 return -1; 00208 } 00209 break; 00210 case 'b': 00211 ci->bg=1; 00212 break; 00213 case 'o': 00214 ci->outline=1; 00215 break; 00216 case '?': 00217 av_log(NULL, AV_LOG_ERROR, "Unrecognized argument '%s'\n", argv[optind]); 00218 return -1; 00219 } 00220 } 00221 00222 if (!ci->text) 00223 { 00224 av_log(NULL, AV_LOG_ERROR, "No text provided (-t text)\n"); 00225 return -1; 00226 } 00227 00228 if (ci->file) 00229 { 00230 FILE *fp; 00231 if ((fp=fopen(ci->file, "r")) == NULL) 00232 { 00233 av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be opened. Using text provided with -t switch: %s", strerror(errno)); 00234 } 00235 else 00236 { 00237 fclose(fp); 00238 } 00239 } 00240 00241 if (!font) 00242 { 00243 av_log(NULL, AV_LOG_ERROR, "No font file provided! (-f filename)\n"); 00244 return -1; 00245 } 00246 00247 if ((error = FT_Init_FreeType(&(ci->library))) != 0) 00248 { 00249 av_log(NULL, AV_LOG_ERROR, "Could not load FreeType (error# %d).\n", error); 00250 return -1; 00251 } 00252 00253 if ((error = FT_New_Face( ci->library, font, 0, &(ci->face) )) != 0) 00254 { 00255 av_log(NULL, AV_LOG_ERROR, "Could not load face: %s (error# %d).\n", font, error); 00256 return -1; 00257 } 00258 00259 if ((error = FT_Set_Pixel_Sizes( ci->face, 0, size)) != 0) 00260 { 00261 av_log(NULL, AV_LOG_ERROR, "Could not set font size to %d pixels (error# %d).\n", size, error); 00262 return -1; 00263 } 00264 00265 ci->use_kerning = FT_HAS_KERNING(ci->face); 00266 00267 /* load and cache glyphs */ 00268 yMax = -32000; 00269 yMin = 32000; 00270 for (c=0; c < 256; c++) 00271 { 00272 /* Load char */ 00273 error = FT_Load_Char( ci->face, (unsigned char) c, FT_LOAD_RENDER | FT_LOAD_MONOCHROME ); 00274 if (error) continue; /* ignore errors */ 00275 00276 /* Save bitmap */ 00277 ci->bitmaps[c] = ci->face->glyph->bitmap; 00278 /* Save bitmap left */ 00279 ci->bitmap_left[c] = ci->face->glyph->bitmap_left; 00280 /* Save bitmap top */ 00281 ci->bitmap_top[c] = ci->face->glyph->bitmap_top; 00282 00283 /* Save advance */ 00284 ci->advance[c] = ci->face->glyph->advance.x >> 6; 00285 00286 /* Save glyph */ 00287 error = FT_Get_Glyph( ci->face->glyph, &(ci->glyphs[c]) ); 00288 /* Save glyph index */ 00289 ci->glyphs_index[c] = FT_Get_Char_Index( ci->face, (unsigned char) c ); 00290 00291 /* Measure text height to calculate text_height (or the maximum text height) */ 00292 FT_Glyph_Get_CBox( ci->glyphs[ c ], ft_glyph_bbox_pixels, &bbox ); 00293 if (bbox.yMax > yMax) 00294 yMax = bbox.yMax; 00295 if (bbox.yMin < yMin) 00296 yMin = bbox.yMin; 00297 00298 } 00299 00300 ci->text_height = yMax - yMin; 00301 ci->baseline = yMax; 00302 00303 return 0; 00304 } 00305 00306 00307 00308 00309 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) 00310 { 00311 int r, c; 00312 int spixel, dpixel[3], in_glyph=0; 00313 00314 if (bitmap->pixel_mode == ft_pixel_mode_mono) 00315 { 00316 in_glyph = 0; 00317 for (r=0; (r < bitmap->rows) && (r+y < height); r++) 00318 { 00319 for (c=0; (c < bitmap->width) && (c+x < width); c++) 00320 { 00321 /* pixel in the picture (destination) */ 00322 GET_PIXEL(picture, dpixel, (c+x), (y+r)); 00323 00324 /* pixel in the glyph bitmap (source) */ 00325 spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8)); 00326 00327 if (spixel) 00328 COPY_3(dpixel, yuv_fgcolor); 00329 00330 if (outline) 00331 { 00332 /* border detection: */ 00333 if ( (!in_glyph) && (spixel) ) 00334 /* left border detected */ 00335 { 00336 in_glyph = 1; 00337 /* draw left pixel border */ 00338 if (c-1 >= 0) 00339 SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r)); 00340 } 00341 else if ( (in_glyph) && (!spixel) ) 00342 /* right border detected */ 00343 { 00344 in_glyph = 0; 00345 /* 'draw' right pixel border */ 00346 COPY_3(dpixel, yuv_bgcolor); 00347 } 00348 00349 if (in_glyph) 00350 /* see if we have a top/bottom border */ 00351 { 00352 /* top */ 00353 if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) ) 00354 /* we have a top border */ 00355 SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1)); 00356 00357 /* bottom */ 00358 if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) ) 00359 /* we have a bottom border */ 00360 SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1)); 00361 00362 } 00363 } 00364 00365 SET_PIXEL(picture, dpixel, (c+x), (y+r)); 00366 } 00367 } 00368 } 00369 } 00370 00371 00372 static inline void draw_box(AVPicture *picture, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_color[3]) 00373 { 00374 int i, j; 00375 00376 for (j = 0; (j < height); j++) 00377 for (i = 0; (i < width); i++) 00378 { 00379 SET_PIXEL(picture, yuv_color, (i+x), (y+j)); 00380 } 00381 00382 } 00383 00384 00385 00386 00387 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts) 00388 { 00389 ContextInfo *ci = (ContextInfo *) ctx; 00390 FT_Face face = ci->face; 00391 FT_GlyphSlot slot = face->glyph; 00392 unsigned char *text = ci->text; 00393 unsigned char c; 00394 int x = 0, y = 0, i=0, size=0; 00395 unsigned char buff[MAXSIZE_TEXT]; 00396 unsigned char tbuff[MAXSIZE_TEXT]; 00397 time_t now = time(0); 00398 int str_w, str_w_max; 00399 FT_Vector pos[MAXSIZE_TEXT]; 00400 FT_Vector delta; 00401 00402 if (ci->file) 00403 { 00404 int fd = open(ci->file, O_RDONLY); 00405 00406 if (fd < 0) 00407 { 00408 text = ci->text; 00409 av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be opened. Using text provided with -t switch: %s", strerror(errno)); 00410 } 00411 else 00412 { 00413 int l = read(fd, tbuff, sizeof(tbuff) - 1); 00414 00415 if (l >= 0) 00416 { 00417 tbuff[l] = 0; 00418 text = tbuff; 00419 } 00420 else 00421 { 00422 text = ci->text; 00423 av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be read. Using text provided with -t switch: %s", strerror(errno)); 00424 } 00425 close(fd); 00426 } 00427 } 00428 else 00429 { 00430 text = ci->text; 00431 } 00432 00433 strftime(buff, sizeof(buff), text, localtime(&now)); 00434 00435 text = buff; 00436 00437 size = strlen(text); 00438 00439 00440 00441 00442 /* measure string size and save glyphs position*/ 00443 str_w = str_w_max = 0; 00444 x = ci->x; 00445 y = ci->y; 00446 for (i=0; i < size; i++) 00447 { 00448 c = text[i]; 00449 00450 /* kerning */ 00451 if ( (ci->use_kerning) && (i > 0) && (ci->glyphs_index[c]) ) 00452 { 00453 FT_Get_Kerning( ci->face, 00454 ci->glyphs_index[ text[i-1] ], 00455 ci->glyphs_index[c], 00456 ft_kerning_default, 00457 &delta ); 00458 00459 x += delta.x >> 6; 00460 } 00461 00462 if (( (x + ci->advance[ c ]) >= width ) || ( c == '\n' )) 00463 { 00464 str_w = width - ci->x - 1; 00465 00466 y += ci->text_height; 00467 x = ci->x; 00468 } 00469 00470 00471 /* save position */ 00472 pos[i].x = x + ci->bitmap_left[c]; 00473 pos[i].y = y - ci->bitmap_top[c] + ci->baseline; 00474 00475 00476 x += ci->advance[c]; 00477 00478 00479 if (str_w > str_w_max) 00480 str_w_max = str_w; 00481 00482 } 00483 00484 00485 00486 00487 if (ci->bg) 00488 { 00489 /* Check if it doesn't pass the limits */ 00490 if ( str_w_max + ci->x >= width ) 00491 str_w_max = width - ci->x - 1; 00492 if ( y >= height ) 00493 y = height - 1 - 2*ci->y; 00494 00495 /* Draw Background */ 00496 draw_box( picture, ci->x, ci->y, str_w_max, y - ci->y, ci->bgcolor ); 00497 } 00498 00499 00500 00501 /* Draw Glyphs */ 00502 for (i=0; i < size; i++) 00503 { 00504 c = text[i]; 00505 00506 if ( 00507 ( (c == '_') && (text == ci->text) ) || /* skip '_' (consider as space) 00508 IF text was specified in cmd line 00509 (which doesn't like nested quotes) */ 00510 ( c == '\n' ) /* Skip new line char, just go to new line */ 00511 ) 00512 continue; 00513 00514 /* now, draw to our target surface */ 00515 draw_glyph( picture, 00516 &(ci->bitmaps[ c ]), 00517 pos[i].x, 00518 pos[i].y, 00519 width, 00520 height, 00521 ci->fgcolor, 00522 ci->bgcolor, 00523 ci->outline ); 00524 00525 /* increment pen position */ 00526 x += slot->advance.x >> 6; 00527 } 00528 00529 00530 } 00531