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 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 "framehook.h"
  49 #include "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 <X11/Xlib.h>
  61 #include <Imlib2.h>
  62
  63 static int sws_flags = SWS_BICUBIC;
  64
  65 typedef struct {
  66     int dummy;
  67     Imlib_Font fn;
  68     char *text;
  69     char *file;
  70     int r, g, b;
  71     int x;
  72     int y;
  73     struct _CachedImage *cache;
  74
  75     // This vhook first converts frame to RGB ...
  76     struct SwsContext *toRGB_convert_ctx;
  77     // ... and then converts back frame from RGB to initial format
  78     struct SwsContext *fromRGB_convert_ctx;
  79 } ContextInfo;
  80
  81 typedef struct _CachedImage {
  82     struct _CachedImage *next;
  83     Imlib_Image image;
  84     int width;
  85     int height;
  86 } CachedImage;
  87
  88 void Release(void *ctx)
  89 {
  90     ContextInfo *ci;
  91     ci = (ContextInfo *) ctx;
  92
  93     if (ci->cache) {
  94         imlib_context_set_image(ci->cache->image);
  95         imlib_free_image();
  96         av_free(ci->cache);
  97     }
  98     if (ctx) {
  99         sws_freeContext(ci->toRGB_convert_ctx);
 100         sws_freeContext(ci->fromRGB_convert_ctx);
 101         av_free(ctx);
 102     }
 103 }
 104
 105 int Configure(void **ctxp, int argc, char *argv[])
 106 {
 107     int c;
 108     ContextInfo *ci;
 109     char *font = "LucidaSansDemiBold/16";
 110     char *fp = getenv("FONTPATH");
 111     char *color = 0;
 112     FILE *f;
 113
 114     *ctxp = av_mallocz(sizeof(ContextInfo));
 115     ci = (ContextInfo *) *ctxp;
 116
 117     optind = 0;
 118
 119     if (fp)
 120         imlib_add_path_to_font_path(fp);
 121
 122     while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
 123         switch (c) {
 124             case 'c':
 125                 color = optarg;
 126                 break;
 127             case 'F':
 128                 font = optarg;
 129                 break;
 130             case 't':
 131                 ci->text = av_strdup(optarg);
 132                 break;
 133             case 'f':
 134                 ci->file = av_strdup(optarg);
 135                 break;
 136             case 'x':
 137                 ci->x = atoi(optarg);
 138                 break;
 139             case 'y':
 140                 ci->y = atoi(optarg);
 141                 break;
 142             case '?':
 143                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 144                 return -1;
 145         }
 146     }
 147
 148     ci->fn = imlib_load_font(font);
 149     if (!ci->fn) {
 150         fprintf(stderr, "Failed to load font '%s'\n", font);
 151         return -1;
 152     }
 153     imlib_context_set_font(ci->fn);
 154     imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
 155
 156     if (color) {
 157         char buff[256];
 158         int done = 0;
 159
 160         f = fopen("/usr/share/X11/rgb.txt", "r");
 161         if (!f)
 162             f = fopen("/usr/lib/X11/rgb.txt", "r");
 163         if (!f) {
 164             fprintf(stderr, "Failed to find rgb.txt\n");
 165             return -1;
 166         }
 167         while (fgets(buff, sizeof(buff), f)) {
 168             int r, g, b;
 169             char colname[80];
 170
 171             if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
 172                 strcasecmp(colname, color) == 0) {
 173                 ci->r = r;
 174                 ci->g = g;
 175                 ci->b = b;
 176                 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
 177                 done = 1;
 178                 break;
 179             }
 180         }
 181         fclose(f);
 182         if (!done) {
 183             fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
 184             return -1;
 185         }
 186     }
 187     imlib_context_set_color(ci->r, ci->g, ci->b, 255);
 188     return 0;
 189 }
 190
 191 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
 192 {
 193     CachedImage *cache;
 194
 195     for (cache = ci->cache; cache; cache = cache->next) {
 196         if (width == cache->width && height == cache->height)
 197             return cache->image;
 198     }
 199
 200     return NULL;
 201 }
 202
 203 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
 204 {
 205     CachedImage *cache = av_mallocz(sizeof(*cache));
 206
 207     cache->image = image;
 208     cache->width = width;
 209     cache->height = height;
 210     cache->next = ci->cache;
 211     ci->cache = cache;
 212 }
 213
 214 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 215 {
 216     ContextInfo *ci = (ContextInfo *) ctx;
 217     AVPicture picture1;
 218     Imlib_Image image;
 219     DATA32 *data;
 220
 221     image = get_cached_image(ci, width, height);
 222
 223     if (!image) {
 224         image = imlib_create_image(width, height);
 225         put_cached_image(ci, image, width, height);
 226     }
 227
 228     imlib_context_set_image(image);
 229     data = imlib_image_get_data();
 230
 231         avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGBA32, width, height);
 232
 233     // if we already got a SWS context, let's realloc if is not re-useable
 234     ci->toRGB_convert_ctx = sws_getCachedContext(ci->toRGB_convert_ctx,
 235                                 width, height, pix_fmt,
 236                                 width, height, PIX_FMT_RGBA32,
 237                                 sws_flags, NULL, NULL, NULL);
 238     if (ci->toRGB_convert_ctx == NULL) {
 239         av_log(NULL, AV_LOG_ERROR,
 240                "Cannot initialize the toRGB conversion context\n");
 241         exit(1);
 242     }
 243
 244 // img_convert parameters are          2 first destination, then 4 source
 245 // sws_scale   parameters are context, 4 first source,      then 2 destination
 246     sws_scale(ci->toRGB_convert_ctx,
 247              picture->data, picture->linesize, 0, height,
 248              picture1.data, picture1.linesize);
 249
 250     imlib_image_set_has_alpha(0);
 251
 252     {
 253         int wid, hig, h_a, v_a;
 254         char buff[1000];
 255         char tbuff[1000];
 256         char *tbp = ci->text;
 257         time_t now = time(0);
 258         char *p, *q;
 259         int x, y;
 260
 261         if (ci->file) {
 262             int fd = open(ci->file, O_RDONLY);
 263
 264             if (fd < 0) {
 265                 tbp = "[File not found]";
 266             } else {
 267                 int l = read(fd, tbuff, sizeof(tbuff) - 1);
 268
 269                 if (l >= 0) {
 270                     tbuff[l] = 0;
 271                     tbp = tbuff;
 272                 } else {
 273                     tbp = "[I/O Error]";
 274                 }
 275                 close(fd);
 276             }
 277         }
 278
 279         strftime(buff, sizeof(buff), tbp ? tbp : "[No data]", localtime(&now));
 280
 281         x = ci->x;
 282         y = ci->y;
 283
 284         for (p = buff; p; p = q) {
 285             q = strchr(p, '\n');
 286             if (q)
 287                 *q++ = 0;
 288
 289             imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
 290             y += v_a;
 291         }
 292     }
 293
 294     ci->fromRGB_convert_ctx = sws_getCachedContext(ci->fromRGB_convert_ctx,
 295                                     width, height, PIX_FMT_RGBA32,
 296                                     width, height, pix_fmt,
 297                                     sws_flags, NULL, NULL, NULL);
 298     if (ci->fromRGB_convert_ctx == NULL) {
 299         av_log(NULL, AV_LOG_ERROR,
 300                "Cannot initialize the fromRGB conversion context\n");
 301         exit(1);
 302     }
 303 // img_convert parameters are          2 first destination, then 4 source
 304 // sws_scale   parameters are context, 4 first source,      then 2 destination
 305     sws_scale(ci->fromRGB_convert_ctx,
 306              picture1.data, picture1.linesize, 0, height,
 307              picture->data, picture->linesize);
 308
 309 }
 310