vhook/imlib2.c

   1 /*
   2  * imlib2 based hook
   3  * Copyright (c) 2002 Philip Gladstone
   4  *
   5  * This module implements a text overlay for a video image. Currently it
   6  * supports a fixed overlay or reading the text from a file. The string
   7  * is passed through strftime so that it is easy to imprint the date and
   8  * time onto the image.
   9  *
  10  * Options:
  11  *
  12  * -c <color>           The color of the text
  13  * -F <fontname>        The font face and size
  14  * -t <text>            The text
  15  * -f <filename>        The filename to read text from
  16  * -x <num>             X coordinate to start text
  17  * -y <num>             Y coordinate to start text
  18  *
  19  * This module is very much intended as an example of what could be done.
  20  * For example, you could overlay an image (even semi-transparent) like
  21  * TV stations do. You can manipulate the image using imlib2 functions
  22  * in any way.
  23  *
  24  * One caution is that this is an expensive process -- in particular the
  25  * conversion of the image into RGB and back is time consuming. For some
  26  * special cases -- e.g. painting black text -- it would be faster to paint
  27  * the text into a bitmap and then combine it directly into the YUV
  28  * image. However, this code is fast enough to handle 10 fps of 320x240 on a
  29  * 900MHz Duron in maybe 15% of the CPU.
  30  *
  31  * This library is free software; you can redistribute it and/or
  32  * modify it under the terms of the GNU Lesser General Public
  33  * License as published by the Free Software Foundation; either
  34  * version 2 of the License, or (at your option) any later version.
  35  *
  36  * This library is distributed in the hope that it will be useful,
  37  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  38  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  39  * Lesser General Public License for more details.
  40  *
  41  * You should have received a copy of the GNU Lesser General Public
  42  * License along with this library; if not, write to the Free Software
  43  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  44  */
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <fcntl.h>
  48 #include <stdarg.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <sys/time.h>
  52 #include <X11/Xlib.h>
  53 #include <Imlib2.h>
  54
  55 #include "framehook.h"
  56
  57 typedef struct {
  58     int dummy;
  59     Imlib_Font fn;
  60     char *text;
  61     char *file;
  62     int r, g, b;
  63     int x;
  64     int y;
  65     struct _CachedImage *cache;
  66 } ContextInfo;
  67
  68 typedef struct _CachedImage {
  69     struct _CachedImage *next;
  70     Imlib_Image image;
  71     int width;
  72     int height;
  73 } CachedImage;
  74
  75 void Release(void *ctx)
  76 {
  77     ContextInfo *ci;
  78     ci = (ContextInfo *) ctx;
  79
  80     if (ci->cache) {
  81         imlib_context_set_image(ci->cache->image);
  82         imlib_free_image();
  83         av_free(ci->cache);
  84     }
  85     if (ctx)
  86         av_free(ctx);
  87 }
  88
  89 int Configure(void **ctxp, int argc, char *argv[])
  90 {
  91     int c;
  92     ContextInfo *ci;
  93     char *font = "LucidaSansDemiBold/16";
  94     char *fp = getenv("FONTPATH");
  95     char *color = 0;
  96     FILE *f;
  97
  98     *ctxp = av_mallocz(sizeof(ContextInfo));
  99     ci = (ContextInfo *) *ctxp;
 100
 101     optind = 0;
 102
 103     if (fp)
 104         imlib_add_path_to_font_path(fp);
 105
 106     while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
 107         switch (c) {
 108             case 'c':
 109                 color = optarg;
 110                 break;
 111             case 'F':
 112                 font = optarg;
 113                 break;
 114             case 't':
 115                 ci->text = av_strdup(optarg);
 116                 break;
 117             case 'f':
 118                 ci->file = av_strdup(optarg);
 119                 break;
 120             case 'x':
 121                 ci->x = atoi(optarg);
 122                 break;
 123             case 'y':
 124                 ci->y = atoi(optarg);
 125                 break;
 126             case '?':
 127                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 128                 return -1;
 129         }
 130     }
 131
 132     ci->fn = imlib_load_font(font);
 133     if (!ci->fn) {
 134         fprintf(stderr, "Failed to load font '%s'\n", font);
 135         return -1;
 136     }
 137     imlib_context_set_font(ci->fn);
 138     imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
 139
 140     if (color) {
 141         char buff[256];
 142         int done = 0;
 143
 144         f = fopen("/usr/lib/X11/rgb.txt", "r");
 145         if (!f) {
 146             fprintf(stderr, "Failed to find rgb.txt\n");
 147             return -1;
 148         }
 149         while (fgets(buff, sizeof(buff), f)) {
 150             int r, g, b;
 151             char colname[80];
 152
 153             if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
 154                 strcasecmp(colname, color) == 0) {
 155                 ci->r = r;
 156                 ci->g = g;
 157                 ci->b = b;
 158                 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
 159                 done = 1;
 160                 break;
 161             }
 162         }
 163         fclose(f);
 164         if (!done) {
 165             fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
 166             return -1;
 167         }
 168     }
 169     imlib_context_set_color(ci->r, ci->g, ci->b, 255);
 170     return 0;
 171 }
 172
 173 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
 174 {
 175     CachedImage *cache;
 176
 177     for (cache = ci->cache; cache; cache = cache->next) {
 178         if (width == cache->width && height == cache->height)
 179             return cache->image;
 180     }
 181
 182     return NULL;
 183 }
 184
 185 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
 186 {
 187     CachedImage *cache = av_mallocz(sizeof(*cache));
 188
 189     cache->image = image;
 190     cache->width = width;
 191     cache->height = height;
 192     cache->next = ci->cache;
 193     ci->cache = cache;
 194 }
 195
 196 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 197 {
 198     ContextInfo *ci = (ContextInfo *) ctx;
 199     AVPicture picture1;
 200     Imlib_Image image;
 201     DATA32 *data;
 202
 203     image = get_cached_image(ci, width, height);
 204
 205     if (!image) {
 206         image = imlib_create_image(width, height);
 207         put_cached_image(ci, image, width, height);
 208     }
 209
 210     imlib_context_set_image(image);
 211     data = imlib_image_get_data();
 212
 213     if (pix_fmt != PIX_FMT_RGBA32) {
 214         avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGBA32, width, height);
 215         if (img_convert(&picture1, PIX_FMT_RGBA32,
 216                         picture, pix_fmt, width, height) < 0) {
 217             goto done;
 218         }
 219     } else {
 220         av_abort();
 221     }
 222
 223     imlib_image_set_has_alpha(0);
 224
 225     {
 226         int wid, hig, h_a, v_a;
 227         char buff[1000];
 228         char tbuff[1000];
 229         char *tbp = ci->text;
 230         time_t now = time(0);
 231         char *p, *q;
 232         int x, y;
 233
 234         if (ci->file) {
 235             int fd = open(ci->file, O_RDONLY);
 236
 237             if (fd < 0) {
 238                 tbp = "[File not found]";
 239             } else {
 240                 int l = read(fd, tbuff, sizeof(tbuff) - 1);
 241
 242                 if (l >= 0) {
 243                     tbuff[l] = 0;
 244                     tbp = tbuff;
 245                 } else {
 246                     tbp = "[I/O Error]";
 247                 }
 248                 close(fd);
 249             }
 250         }
 251
 252         strftime(buff, sizeof(buff), tbp ? tbp : "[No data]", localtime(&now));
 253
 254         x = ci->x;
 255         y = ci->y;
 256
 257         for (p = buff; p; p = q) {
 258             q = strchr(p, '\n');
 259             if (q)
 260                 *q++ = 0;
 261
 262             imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
 263             y += v_a;
 264         }
 265     }
 266
 267     if (pix_fmt != PIX_FMT_RGBA32) {
 268         if (img_convert(picture, pix_fmt,
 269                         &picture1, PIX_FMT_RGBA32, width, height) < 0) {
 270         }
 271     }
 272
 273 done:
 274     ;
 275 }
 276