vhook/imlib2.c

   1 /*
   2  * imlib2 based hook
   3  * Copyright (c) 2002 Philip Gladstone
   4  *
   5  * This module is very much intended as an example of what could be done.
   6  *
   7  * One caution is that this is an expensive process -- in particular the
   8  * conversion of the image into RGB and back is time consuming. For some
   9  * special cases -- e.g. painting black text -- it would be faster to paint
  10  * the text into a bitmap and then combine it directly into the YUV
  11  * image. However, this code is fast enough to handle 10 fps of 320x240 on a
  12  * 900MHz Duron in maybe 15% of the CPU.
  13
  14  * See further statistics on Pentium4, 3GHz, FFMpeg is SVN-r6798
  15  * Input movie is 20.2 seconds of PAL DV on AVI
  16  * Output movie is DVD compliant VOB.
  17  *
  18    ffmpeg -i input.avi -target pal-dvd out.vob
  19    #   13.516s  just transcode
  20    ffmpeg -i input.avi -vhook /usr/local/bin/vhook/null.dll -target pal-dvd out.vob
  21    #   23.546s  transcode and img_convert
  22    ffmpeg -i input.avi -vhook \
  23      'vhook/imlib2.dll -c red -F Vera/20 -x 150-0.5*N -y 70+0.25*N -t Hello_person' \
  24      -target pal-dvd out.vob
  25    #   21.454s  transcode, img_convert and move text around
  26    ffmpeg -i input.avi -vhook \
  27      'vhook/imlib2.dll -x 150-0.5*N -y 70+0.25*N -i /usr/share/imlib2/data/images/bulb.png' \
  28      -target pal-dvd out.vob
  29    #   20.828s  transcode, img_convert and move image around
  30  *
  31  * This file is part of FFmpeg.
  32  *
  33  * FFmpeg is free software; you can redistribute it and/or
  34  * modify it under the terms of the GNU Lesser General Public
  35  * License as published by the Free Software Foundation; either
  36  * version 2.1 of the License, or (at your option) any later version.
  37  *
  38  * FFmpeg is distributed in the hope that it will be useful,
  39  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  40  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  41  * Lesser General Public License for more details.
  42  *
  43  * You should have received a copy of the GNU Lesser General Public
  44  * License along with FFmpeg; if not, write to the Free Software
  45  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  46  */
  47
  48 #include "libavformat/framehook.h"
  49 #include "libswscale/swscale.h"
  50
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <fcntl.h>
  54 #include <stdarg.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57 #undef time
  58 #include <sys/time.h>
  59 #include <time.h>
  60 #include <Imlib2.h>
  61 #include "libavcodec/eval.h"
  62
  63 const char *const_names[]={
  64     "PI",
  65     "E",
  66     "N",  // frame number (starting at zero)
  67     "H",  // frame height
  68     "W",  // frame width
  69     "h",  // image height
  70     "w",  // image width
  71     "X",  // previous x
  72     "Y",  // previous y
  73     NULL
  74 };
  75
  76 static int sws_flags = SWS_BICUBIC;
  77
  78 typedef struct {
  79     int dummy;
  80     Imlib_Font fn;
  81     char *text;
  82     char *file;
  83     int r, g, b, a;
  84     AVEvalExpr *eval_r, *eval_g, *eval_b, *eval_a;
  85     char *expr_R, *expr_G, *expr_B, *expr_A;
  86     int eval_colors;
  87     double x, y;
  88     char *fileImage;
  89     struct CachedImage *cache;
  90     Imlib_Image imageOverlaid;
  91     AVEvalExpr *eval_x, *eval_y;
  92     char *expr_x, *expr_y;
  93     int frame_number;
  94     int imageOverlaid_width, imageOverlaid_height;
  95
  96     // This vhook first converts frame to RGB ...
  97     struct SwsContext *toRGB_convert_ctx;
  98     // ... and then converts back frame from RGB to initial format
  99     struct SwsContext *fromRGB_convert_ctx;
 100 } ContextInfo;
 101
 102 typedef struct CachedImage {
 103     struct CachedImage *next;
 104     Imlib_Image image;
 105     int width;
 106     int height;
 107 } CachedImage;
 108
 109 void Release(void *ctx)
 110 {
 111     ContextInfo *ci;
 112     ci = (ContextInfo *) ctx;
 113
 114     if (ci->cache) {
 115         imlib_context_set_image(ci->cache->image);
 116         imlib_free_image();
 117         av_free(ci->cache);
 118     }
 119     if (ctx) {
 120         if (ci->imageOverlaid) {
 121             imlib_context_set_image(ci->imageOverlaid);
 122             imlib_free_image();
 123         }
 124         ff_eval_free(ci->eval_x);
 125         ff_eval_free(ci->eval_y);
 126         ff_eval_free(ci->eval_r);
 127         ff_eval_free(ci->eval_g);
 128         ff_eval_free(ci->eval_b);
 129         ff_eval_free(ci->eval_a);
 130
 131         av_free(ci->expr_x);
 132         av_free(ci->expr_y);
 133         av_free(ci->expr_R);
 134         av_free(ci->expr_G);
 135         av_free(ci->expr_B);
 136         av_free(ci->expr_A);
 137         sws_freeContext(ci->toRGB_convert_ctx);
 138         sws_freeContext(ci->fromRGB_convert_ctx);
 139         av_free(ctx);
 140     }
 141 }
 142
 143 int Configure(void **ctxp, int argc, char *argv[])
 144 {
 145     int c;
 146     ContextInfo *ci;
 147     char *rgbtxt = 0;
 148     char *font = "LucidaSansDemiBold/16";
 149     char *fp = getenv("FONTPATH");
 150     char *color = 0;
 151     FILE *f;
 152     char *p;
 153     char *error;
 154
 155     *ctxp = av_mallocz(sizeof(ContextInfo));
 156     ci = (ContextInfo *) *ctxp;
 157
 158     ci->x = 0.0;
 159     ci->y = 0.0;
 160     ci->expr_x = "0.0";
 161     ci->expr_y = "0.0";
 162
 163     optind = 1;
 164
 165     /* Use ':' to split FONTPATH */
 166     if (fp)
 167         while (p = strchr(fp, ':')) {
 168             *p = 0;
 169             imlib_add_path_to_font_path(fp);
 170             fp = p + 1;
 171         }
 172     if ((fp) && (*fp))
 173         imlib_add_path_to_font_path(fp);
 174
 175
 176     while ((c = getopt(argc, argv, "R:G:B:A:C:c:f:F:t:x:y:i:")) > 0) {
 177         switch (c) {
 178             case 'R':
 179                 ci->expr_R = av_strdup(optarg);
 180                 ci->eval_colors = 1;
 181                 break;
 182             case 'G':
 183                 ci->expr_G = av_strdup(optarg);
 184                 ci->eval_colors = 1;
 185                 break;
 186             case 'B':
 187                 ci->expr_B = av_strdup(optarg);
 188                 ci->eval_colors = 1;
 189                 break;
 190             case 'A':
 191                 ci->expr_A = av_strdup(optarg);
 192                 break;
 193             case 'C':
 194                 rgbtxt = optarg;
 195                 break;
 196             case 'c':
 197                 color = optarg;
 198                 break;
 199             case 'F':
 200                 font = optarg;
 201                 break;
 202             case 't':
 203                 ci->text = av_strdup(optarg);
 204                 break;
 205             case 'f':
 206                 ci->file = av_strdup(optarg);
 207                 break;
 208             case 'x':
 209                 ci->expr_x = av_strdup(optarg);
 210                 break;
 211             case 'y':
 212                 ci->expr_y = av_strdup(optarg);
 213                 break;
 214             case 'i':
 215                 ci->fileImage = av_strdup(optarg);
 216                 break;
 217             case '?':
 218                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 219                 return -1;
 220         }
 221     }
 222
 223     if (ci->eval_colors && !(ci->expr_R && ci->expr_G && ci->expr_B))
 224     {
 225         fprintf(stderr, "You must specify expressions for all or no colors.\n");
 226         return -1;
 227     }
 228
 229     if (ci->text || ci->file) {
 230         ci->fn = imlib_load_font(font);
 231         if (!ci->fn) {
 232             fprintf(stderr, "Failed to load font '%s'\n", font);
 233             return -1;
 234         }
 235         imlib_context_set_font(ci->fn);
 236         imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
 237     }
 238
 239     if (color) {
 240         char buff[256];
 241         int done = 0;
 242
 243         if (ci->eval_colors)
 244         {
 245             fprintf(stderr, "You must not specify both a color name and expressions for the colors.\n");
 246             return -1;
 247         }
 248
 249         if (rgbtxt)
 250             f = fopen(rgbtxt, "r");
 251         else
 252         {
 253             f = fopen("/usr/share/X11/rgb.txt", "r");
 254             if (!f)
 255                 f = fopen("/usr/lib/X11/rgb.txt", "r");
 256         }
 257         if (!f) {
 258             fprintf(stderr, "Failed to find RGB color names file\n");
 259             return -1;
 260         }
 261         while (fgets(buff, sizeof(buff), f)) {
 262             int r, g, b;
 263             char colname[80];
 264
 265             if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
 266                 strcasecmp(colname, color) == 0) {
 267                 ci->r = r;
 268                 ci->g = g;
 269                 ci->b = b;
 270                 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
 271                 done = 1;
 272                 break;
 273             }
 274         }
 275         fclose(f);
 276         if (!done) {
 277             fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
 278             return -1;
 279         }
 280     } else if (ci->eval_colors) {
 281         if (!(ci->eval_r = ff_parse(ci->expr_R, const_names, NULL, NULL, NULL, NULL, &error))){
 282             av_log(NULL, AV_LOG_ERROR, "Couldn't parse R expression '%s': %s\n", ci->expr_R, error);
 283             return -1;
 284         }
 285         if (!(ci->eval_g = ff_parse(ci->expr_G, const_names, NULL, NULL, NULL, NULL, &error))){
 286             av_log(NULL, AV_LOG_ERROR, "Couldn't parse G expression '%s': %s\n", ci->expr_G, error);
 287             return -1;
 288         }
 289         if (!(ci->eval_b = ff_parse(ci->expr_B, const_names, NULL, NULL, NULL, NULL, &error))){
 290             av_log(NULL, AV_LOG_ERROR, "Couldn't parse B expression '%s': %s\n", ci->expr_B, error);
 291             return -1;
 292         }
 293     }
 294
 295     if (ci->expr_A) {
 296         if (!(ci->eval_a = ff_parse(ci->expr_A, const_names, NULL, NULL, NULL, NULL, &error))){
 297             av_log(NULL, AV_LOG_ERROR, "Couldn't parse A expression '%s': %s\n", ci->expr_A, error);
 298             return -1;
 299         }
 300     } else {
 301         ci->a = 255;
 302     }
 303
 304     if (!(ci->eval_colors || ci->eval_a))
 305         imlib_context_set_color(ci->r, ci->g, ci->b, ci->a);
 306
 307     /* load the image (for example, credits for a movie) */
 308     if (ci->fileImage) {
 309         ci->imageOverlaid = imlib_load_image_immediately(ci->fileImage);
 310         if (!(ci->imageOverlaid)){
 311             av_log(NULL, AV_LOG_ERROR, "Couldn't load image '%s'\n", ci->fileImage);
 312             return -1;
 313         }
 314         imlib_context_set_image(ci->imageOverlaid);
 315         ci->imageOverlaid_width  = imlib_image_get_width();
 316         ci->imageOverlaid_height = imlib_image_get_height();
 317     }
 318
 319     if (!(ci->eval_x = ff_parse(ci->expr_x, const_names, NULL, NULL, NULL, NULL, &error))){
 320         av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s': %s\n", ci->expr_x, error);
 321         return -1;
 322     }
 323
 324     if (!(ci->eval_y = ff_parse(ci->expr_y, const_names, NULL, NULL, NULL, NULL, &error))){
 325         av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s': %s\n", ci->expr_y, error);
 326         return -1;
 327     }
 328
 329     return 0;
 330 }
 331
 332 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
 333 {
 334     CachedImage *cache;
 335
 336     for (cache = ci->cache; cache; cache = cache->next) {
 337         if (width == cache->width && height == cache->height)
 338             return cache->image;
 339     }
 340
 341     return NULL;
 342 }
 343
 344 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
 345 {
 346     CachedImage *cache = av_mallocz(sizeof(*cache));
 347
 348     cache->image = image;
 349     cache->width = width;
 350     cache->height = height;
 351     cache->next = ci->cache;
 352     ci->cache = cache;
 353 }
 354
 355 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 356 {
 357     ContextInfo *ci = (ContextInfo *) ctx;
 358     AVPicture picture1;
 359     Imlib_Image image;
 360     DATA32 *data;
 361
 362     image = get_cached_image(ci, width, height);
 363
 364     if (!image) {
 365         image = imlib_create_image(width, height);
 366         put_cached_image(ci, image, width, height);
 367     }
 368
 369     imlib_context_set_image(image);
 370     data = imlib_image_get_data();
 371
 372     avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGB32, width, height);
 373
 374     // if we already got a SWS context, let's realloc if is not re-useable
 375     ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
 376                                 width, height, pix_fmt,
 377                                 width, height, PIX_FMT_RGB32,
 378                                 sws_flags, NULL, NULL, NULL);
 379     if (ci->toRGB_convert_ctx == NULL) {
 380         av_log(NULL, AV_LOG_ERROR,
 381                "Cannot initialize the toRGB conversion context\n");
 382         return;
 383     }
 384
 385 // img_convert parameters are          2 first destination, then 4 source
 386 // sws_scale   parameters are context, 4 first source,      then 2 destination
 387     sws_scale(ci->toRGB_convert_ctx,
 388              picture->data, picture->linesize, 0, height,
 389              picture1.data, picture1.linesize);
 390
 391     imlib_image_set_has_alpha(0);
 392
 393     {
 394         int wid, hig, h_a, v_a;
 395         char buff[1000];
 396         char tbuff[1000];
 397         char *tbp = ci->text;
 398         time_t now = time(0);
 399         char *p, *q;
 400         int y;
 401
 402         double const_values[]={
 403             M_PI,
 404             M_E,
 405             ci->frame_number,         // frame number (starting at zero)
 406             height,                   // frame height
 407             width,                    // frame width
 408             ci->imageOverlaid_height, // image height
 409             ci->imageOverlaid_width,  // image width
 410             ci->x,                    // previous x
 411             ci->y,                    // previous y
 412             0
 413         };
 414
 415         if (ci->file) {
 416             int fd = open(ci->file, O_RDONLY);
 417
 418             if (fd < 0) {
 419                 tbp = "[File not found]";
 420             } else {
 421                 int l = read(fd, tbuff, sizeof(tbuff) - 1);
 422
 423                 if (l >= 0) {
 424                     tbuff[l] = 0;
 425                     tbp = tbuff;
 426                 } else {
 427                     tbp = "[I/O Error]";
 428                 }
 429                 close(fd);
 430             }
 431         }
 432
 433         if (tbp)
 434             strftime(buff, sizeof(buff), tbp, localtime(&now));
 435         else if (!(ci->imageOverlaid))
 436             strftime(buff, sizeof(buff), "[No data]", localtime(&now));
 437
 438         ci->x = ff_parse_eval(ci->eval_x, const_values, ci);
 439         ci->y = ff_parse_eval(ci->eval_y, const_values, ci);
 440         y = ci->y;
 441
 442         if (ci->eval_a) {
 443             ci->a = ff_parse_eval(ci->eval_a, const_values, ci);
 444         }
 445
 446         if (ci->eval_colors) {
 447             ci->r = ff_parse_eval(ci->eval_r, const_values, ci);
 448             ci->g = ff_parse_eval(ci->eval_g, const_values, ci);
 449             ci->b = ff_parse_eval(ci->eval_b, const_values, ci);
 450         }
 451
 452         if (ci->eval_colors || ci->eval_a) {
 453             imlib_context_set_color(ci->r, ci->g, ci->b, ci->a);
 454         }
 455
 456         if (!(ci->imageOverlaid))
 457         for (p = buff; p; p = q) {
 458             q = strchr(p, '\n');
 459             if (q)
 460                 *q++ = 0;
 461
 462             imlib_text_draw_with_return_metrics(ci->x, y, p, &wid, &hig, &h_a, &v_a);
 463             y += v_a;
 464         }
 465
 466         if (ci->imageOverlaid) {
 467             imlib_context_set_image(image);
 468             imlib_blend_image_onto_image(ci->imageOverlaid, 0,
 469                 0, 0, ci->imageOverlaid_width, ci->imageOverlaid_height,
 470                 ci->x, ci->y, ci->imageOverlaid_width, ci->imageOverlaid_height);
 471         }
 472
 473     }
 474
 475     ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
 476                                     width, height, PIX_FMT_RGB32,
 477                                     width, height, pix_fmt,
 478                                     sws_flags, NULL, NULL, NULL);
 479     if (ci->fromRGB_convert_ctx == NULL) {
 480         av_log(NULL, AV_LOG_ERROR,
 481                "Cannot initialize the fromRGB conversion context\n");
 482         return;
 483     }
 484 // img_convert parameters are          2 first destination, then 4 source
 485 // sws_scale   parameters are context, 4 first source,      then 2 destination
 486     sws_scale(ci->fromRGB_convert_ctx,
 487              picture1.data, picture1.linesize, 0, height,
 488              picture->data, picture->linesize);
 489
 490     ci->frame_number++;
 491 }
 492