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 <strings.h>
  57 #include <unistd.h>
  58 #undef time
  59 #include <sys/time.h>
  60 #include <time.h>
  61 #include <Imlib2.h>
  62 #include "libavcodec/eval.h"
  63
  64 const char *const_names[]={
  65     "PI",
  66     "E",
  67     "N",  // frame number (starting at zero)
  68     "H",  // frame height
  69     "W",  // frame width
  70     "h",  // image height
  71     "w",  // image width
  72     "X",  // previous x
  73     "Y",  // previous y
  74     NULL
  75 };
  76
  77 static int sws_flags = SWS_BICUBIC;
  78
  79 typedef struct {
  80     int dummy;
  81     Imlib_Font fn;
  82     char *text;
  83     char *file;
  84     int r, g, b, a;
  85     AVEvalExpr *eval_r, *eval_g, *eval_b, *eval_a;
  86     char *expr_R, *expr_G, *expr_B, *expr_A;
  87     int eval_colors;
  88     double x, y;
  89     char *fileImage;
  90     struct CachedImage *cache;
  91     Imlib_Image imageOverlaid;
  92     AVEvalExpr *eval_x, *eval_y;
  93     char *expr_x, *expr_y;
  94     int frame_number;
  95     int imageOverlaid_width, imageOverlaid_height;
  96
  97     // This vhook first converts frame to RGB ...
  98     struct SwsContext *toRGB_convert_ctx;
  99     // ... and then converts back frame from RGB to initial format
 100     struct SwsContext *fromRGB_convert_ctx;
 101 } ContextInfo;
 102
 103 typedef struct CachedImage {
 104     struct CachedImage *next;
 105     Imlib_Image image;
 106     int width;
 107     int height;
 108 } CachedImage;
 109
 110 void Release(void *ctx)
 111 {
 112     ContextInfo *ci;
 113     ci = (ContextInfo *) ctx;
 114
 115     if (ci->cache) {
 116         imlib_context_set_image(ci->cache->image);
 117         imlib_free_image();
 118         av_free(ci->cache);
 119     }
 120     if (ctx) {
 121         if (ci->imageOverlaid) {
 122             imlib_context_set_image(ci->imageOverlaid);
 123             imlib_free_image();
 124         }
 125         ff_eval_free(ci->eval_x);
 126         ff_eval_free(ci->eval_y);
 127         ff_eval_free(ci->eval_r);
 128         ff_eval_free(ci->eval_g);
 129         ff_eval_free(ci->eval_b);
 130         ff_eval_free(ci->eval_a);
 131
 132         av_free(ci->expr_x);
 133         av_free(ci->expr_y);
 134         av_free(ci->expr_R);
 135         av_free(ci->expr_G);
 136         av_free(ci->expr_B);
 137         av_free(ci->expr_A);
 138         sws_freeContext(ci->toRGB_convert_ctx);
 139         sws_freeContext(ci->fromRGB_convert_ctx);
 140         av_free(ctx);
 141     }
 142 }
 143
 144 int Configure(void **ctxp, int argc, char *argv[])
 145 {
 146     int c;
 147     ContextInfo *ci;
 148     char *rgbtxt = 0;
 149     char *font = "LucidaSansDemiBold/16";
 150     char *fp = getenv("FONTPATH");
 151     char *color = 0;
 152     FILE *f;
 153     char *p;
 154     char *error;
 155
 156     *ctxp = av_mallocz(sizeof(ContextInfo));
 157     ci = (ContextInfo *) *ctxp;
 158
 159     ci->x = 0.0;
 160     ci->y = 0.0;
 161     ci->expr_x = "0.0";
 162     ci->expr_y = "0.0";
 163
 164     optind = 1;
 165
 166     /* Use ':' to split FONTPATH */
 167     if (fp)
 168         while (p = strchr(fp, ':')) {
 169             *p = 0;
 170             imlib_add_path_to_font_path(fp);
 171             fp = p + 1;
 172         }
 173     if ((fp) && (*fp))
 174         imlib_add_path_to_font_path(fp);
 175
 176
 177     while ((c = getopt(argc, argv, "R:G:B:A:C:c:f:F:t:x:y:i:")) > 0) {
 178         switch (c) {
 179             case 'R':
 180                 ci->expr_R = av_strdup(optarg);
 181                 ci->eval_colors = 1;
 182                 break;
 183             case 'G':
 184                 ci->expr_G = av_strdup(optarg);
 185                 ci->eval_colors = 1;
 186                 break;
 187             case 'B':
 188                 ci->expr_B = av_strdup(optarg);
 189                 ci->eval_colors = 1;
 190                 break;
 191             case 'A':
 192                 ci->expr_A = av_strdup(optarg);
 193                 break;
 194             case 'C':
 195                 rgbtxt = optarg;
 196                 break;
 197             case 'c':
 198                 color = optarg;
 199                 break;
 200             case 'F':
 201                 font = optarg;
 202                 break;
 203             case 't':
 204                 ci->text = av_strdup(optarg);
 205                 break;
 206             case 'f':
 207                 ci->file = av_strdup(optarg);
 208                 break;
 209             case 'x':
 210                 ci->expr_x = av_strdup(optarg);
 211                 break;
 212             case 'y':
 213                 ci->expr_y = av_strdup(optarg);
 214                 break;
 215             case 'i':
 216                 ci->fileImage = av_strdup(optarg);
 217                 break;
 218             case '?':
 219                 av_log(NULL, AV_LOG_ERROR, "Unrecognized argument '%s'\n", argv[optind]);
 220                 return -1;
 221         }
 222     }
 223
 224     if (ci->eval_colors && !(ci->expr_R && ci->expr_G && ci->expr_B))
 225     {
 226         av_log(NULL, AV_LOG_ERROR, "You must specify expressions for all or no colors.\n");
 227         return -1;
 228     }
 229
 230     if (ci->text || ci->file) {
 231         ci->fn = imlib_load_font(font);
 232         if (!ci->fn) {
 233             av_log(NULL, AV_LOG_ERROR, "Failed to load font '%s'\n", font);
 234             return -1;
 235         }
 236         imlib_context_set_font(ci->fn);
 237         imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
 238     }
 239
 240     if (color) {
 241         char buff[256];
 242         int done = 0;
 243
 244         if (ci->eval_colors)
 245         {
 246             av_log(NULL, AV_LOG_ERROR, "You must not specify both a color name and expressions for the colors.\n");
 247             return -1;
 248         }
 249
 250         if (rgbtxt)
 251             f = fopen(rgbtxt, "r");
 252         else
 253         {
 254             f = fopen("/usr/share/X11/rgb.txt", "r");
 255             if (!f)
 256                 f = fopen("/usr/lib/X11/rgb.txt", "r");
 257         }
 258         if (!f) {
 259             av_log(NULL, AV_LOG_ERROR, "Failed to find RGB color names file\n");
 260             return -1;
 261         }
 262         while (fgets(buff, sizeof(buff), f)) {
 263             int r, g, b;
 264             char colname[80];
 265
 266             if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
 267                 strcasecmp(colname, color) == 0) {
 268                 ci->r = r;
 269                 ci->g = g;
 270                 ci->b = b;
 271                 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
 272                 done = 1;
 273                 break;
 274             }
 275         }
 276         fclose(f);
 277         if (!done) {
 278             av_log(NULL, AV_LOG_ERROR, "Unable to find color '%s' in rgb.txt\n", color);
 279             return -1;
 280         }
 281     } else if (ci->eval_colors) {
 282         if (!(ci->eval_r = ff_parse(ci->expr_R, const_names, NULL, NULL, NULL, NULL, &error))){
 283             av_log(NULL, AV_LOG_ERROR, "Couldn't parse R expression '%s': %s\n", ci->expr_R, error);
 284             return -1;
 285         }
 286         if (!(ci->eval_g = ff_parse(ci->expr_G, const_names, NULL, NULL, NULL, NULL, &error))){
 287             av_log(NULL, AV_LOG_ERROR, "Couldn't parse G expression '%s': %s\n", ci->expr_G, error);
 288             return -1;
 289         }
 290         if (!(ci->eval_b = ff_parse(ci->expr_B, const_names, NULL, NULL, NULL, NULL, &error))){
 291             av_log(NULL, AV_LOG_ERROR, "Couldn't parse B expression '%s': %s\n", ci->expr_B, error);
 292             return -1;
 293         }
 294     }
 295
 296     if (ci->expr_A) {
 297         if (!(ci->eval_a = ff_parse(ci->expr_A, const_names, NULL, NULL, NULL, NULL, &error))){
 298             av_log(NULL, AV_LOG_ERROR, "Couldn't parse A expression '%s': %s\n", ci->expr_A, error);
 299             return -1;
 300         }
 301     } else {
 302         ci->a = 255;
 303     }
 304
 305     if (!(ci->eval_colors || ci->eval_a))
 306         imlib_context_set_color(ci->r, ci->g, ci->b, ci->a);
 307
 308     /* load the image (for example, credits for a movie) */
 309     if (ci->fileImage) {
 310         ci->imageOverlaid = imlib_load_image_immediately(ci->fileImage);
 311         if (!(ci->imageOverlaid)){
 312             av_log(NULL, AV_LOG_ERROR, "Couldn't load image '%s'\n", ci->fileImage);
 313             return -1;
 314         }
 315         imlib_context_set_image(ci->imageOverlaid);
 316         ci->imageOverlaid_width  = imlib_image_get_width();
 317         ci->imageOverlaid_height = imlib_image_get_height();
 318     }
 319
 320     if (!(ci->eval_x = ff_parse(ci->expr_x, const_names, NULL, NULL, NULL, NULL, &error))){
 321         av_log(NULL, AV_LOG_ERROR, "Couldn't parse x expression '%s': %s\n", ci->expr_x, error);
 322         return -1;
 323     }
 324
 325     if (!(ci->eval_y = ff_parse(ci->expr_y, const_names, NULL, NULL, NULL, NULL, &error))){
 326         av_log(NULL, AV_LOG_ERROR, "Couldn't parse y expression '%s': %s\n", ci->expr_y, error);
 327         return -1;
 328     }
 329
 330     return 0;
 331 }
 332
 333 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
 334 {
 335     CachedImage *cache;
 336
 337     for (cache = ci->cache; cache; cache = cache->next) {
 338         if (width == cache->width && height == cache->height)
 339             return cache->image;
 340     }
 341
 342     return NULL;
 343 }
 344
 345 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
 346 {
 347     CachedImage *cache = av_mallocz(sizeof(*cache));
 348
 349     cache->image = image;
 350     cache->width = width;
 351     cache->height = height;
 352     cache->next = ci->cache;
 353     ci->cache = cache;
 354 }
 355
 356 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 357 {
 358     ContextInfo *ci = (ContextInfo *) ctx;
 359     AVPicture picture1;
 360     Imlib_Image image;
 361     DATA32 *data;
 362
 363     image = get_cached_image(ci, width, height);
 364
 365     if (!image) {
 366         image = imlib_create_image(width, height);
 367         put_cached_image(ci, image, width, height);
 368     }
 369
 370     imlib_context_set_image(image);
 371     data = imlib_image_get_data();
 372
 373     avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGB32, width, height);
 374
 375     // if we already got a SWS context, let's realloc if is not re-useable
 376     ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
 377                                 width, height, pix_fmt,
 378                                 width, height, PIX_FMT_RGB32,
 379                                 sws_flags, NULL, NULL, NULL);
 380     if (ci->toRGB_convert_ctx == NULL) {
 381         av_log(NULL, AV_LOG_ERROR,
 382                "Cannot initialize the toRGB conversion context\n");
 383         return;
 384     }
 385
 386 // img_convert parameters are          2 first destination, then 4 source
 387 // sws_scale   parameters are context, 4 first source,      then 2 destination
 388     sws_scale(ci->toRGB_convert_ctx,
 389              picture->data, picture->linesize, 0, height,
 390              picture1.data, picture1.linesize);
 391
 392     imlib_image_set_has_alpha(0);
 393
 394     {
 395         int wid, hig, h_a, v_a;
 396         char buff[1000];
 397         char tbuff[1000];
 398         char *tbp = ci->text;
 399         time_t now = time(0);
 400         char *p, *q;
 401         int y;
 402
 403         double const_values[]={
 404             M_PI,
 405             M_E,
 406             ci->frame_number,         // frame number (starting at zero)
 407             height,                   // frame height
 408             width,                    // frame width
 409             ci->imageOverlaid_height, // image height
 410             ci->imageOverlaid_width,  // image width
 411             ci->x,                    // previous x
 412             ci->y,                    // previous y
 413             0
 414         };
 415
 416         if (ci->file) {
 417             int fd = open(ci->file, O_RDONLY);
 418
 419             if (fd < 0) {
 420                 tbp = "[File not found]";
 421             } else {
 422                 int l = read(fd, tbuff, sizeof(tbuff) - 1);
 423
 424                 if (l >= 0) {
 425                     tbuff[l] = 0;
 426                     tbp = tbuff;
 427                 } else {
 428                     tbp = "[I/O Error]";
 429                 }
 430                 close(fd);
 431             }
 432         }
 433
 434         if (tbp)
 435             strftime(buff, sizeof(buff), tbp, localtime(&now));
 436         else if (!(ci->imageOverlaid))
 437             strftime(buff, sizeof(buff), "[No data]", localtime(&now));
 438
 439         ci->x = ff_parse_eval(ci->eval_x, const_values, ci);
 440         ci->y = ff_parse_eval(ci->eval_y, const_values, ci);
 441         y = ci->y;
 442
 443         if (ci->eval_a) {
 444             ci->a = ff_parse_eval(ci->eval_a, const_values, ci);
 445         }
 446
 447         if (ci->eval_colors) {
 448             ci->r = ff_parse_eval(ci->eval_r, const_values, ci);
 449             ci->g = ff_parse_eval(ci->eval_g, const_values, ci);
 450             ci->b = ff_parse_eval(ci->eval_b, const_values, ci);
 451         }
 452
 453         if (ci->eval_colors || ci->eval_a) {
 454             imlib_context_set_color(ci->r, ci->g, ci->b, ci->a);
 455         }
 456
 457         if (!(ci->imageOverlaid))
 458         for (p = buff; p; p = q) {
 459             q = strchr(p, '\n');
 460             if (q)
 461                 *q++ = 0;
 462
 463             imlib_text_draw_with_return_metrics(ci->x, y, p, &wid, &hig, &h_a, &v_a);
 464             y += v_a;
 465         }
 466
 467         if (ci->imageOverlaid) {
 468             imlib_context_set_image(image);
 469             imlib_blend_image_onto_image(ci->imageOverlaid, 0,
 470                 0, 0, ci->imageOverlaid_width, ci->imageOverlaid_height,
 471                 ci->x, ci->y, ci->imageOverlaid_width, ci->imageOverlaid_height);
 472         }
 473
 474     }
 475
 476     ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
 477                                     width, height, PIX_FMT_RGB32,
 478                                     width, height, pix_fmt,
 479                                     sws_flags, NULL, NULL, NULL);
 480     if (ci->fromRGB_convert_ctx == NULL) {
 481         av_log(NULL, AV_LOG_ERROR,
 482                "Cannot initialize the fromRGB conversion context\n");
 483         return;
 484     }
 485 // img_convert parameters are          2 first destination, then 4 source
 486 // sws_scale   parameters are context, 4 first source,      then 2 destination
 487     sws_scale(ci->fromRGB_convert_ctx,
 488              picture1.data, picture1.linesize, 0, height,
 489              picture->data, picture->linesize);
 490
 491     ci->frame_number++;
 492 }
 493