3 * Copyright (c) 2002 Philip Gladstone
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
12 * -c <color> The color of the text
13 * -F <fontname> The font face and size
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
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
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.
31 * This file is part of FFmpeg.
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.
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.
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
48 #include "framehook.h"
70 struct _CachedImage *cache;
73 typedef struct _CachedImage {
74 struct _CachedImage *next;
80 void Release(void *ctx)
83 ci = (ContextInfo *) ctx;
86 imlib_context_set_image(ci->cache->image);
94 int Configure(void **ctxp, int argc, char *argv[])
98 char *font = "LucidaSansDemiBold/16";
99 char *fp = getenv("FONTPATH");
103 *ctxp = av_mallocz(sizeof(ContextInfo));
104 ci = (ContextInfo *) *ctxp;
109 imlib_add_path_to_font_path(fp);
111 while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
120 ci->text = av_strdup(optarg);
123 ci->file = av_strdup(optarg);
126 ci->x = atoi(optarg);
129 ci->y = atoi(optarg);
132 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
137 ci->fn = imlib_load_font(font);
139 fprintf(stderr, "Failed to load font '%s'\n", font);
142 imlib_context_set_font(ci->fn);
143 imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
149 f = fopen("/usr/share/X11/rgb.txt", "r");
151 f = fopen("/usr/lib/X11/rgb.txt", "r");
153 fprintf(stderr, "Failed to find rgb.txt\n");
156 while (fgets(buff, sizeof(buff), f)) {
160 if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
161 strcasecmp(colname, color) == 0) {
165 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
172 fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
176 imlib_context_set_color(ci->r, ci->g, ci->b, 255);
180 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
184 for (cache = ci->cache; cache; cache = cache->next) {
185 if (width == cache->width && height == cache->height)
192 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
194 CachedImage *cache = av_mallocz(sizeof(*cache));
196 cache->image = image;
197 cache->width = width;
198 cache->height = height;
199 cache->next = ci->cache;
203 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
205 ContextInfo *ci = (ContextInfo *) ctx;
210 image = get_cached_image(ci, width, height);
213 image = imlib_create_image(width, height);
214 put_cached_image(ci, image, width, height);
217 imlib_context_set_image(image);
218 data = imlib_image_get_data();
220 avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGBA32, width, height);
221 if (pix_fmt != PIX_FMT_RGBA32) {
222 if (img_convert(&picture1, PIX_FMT_RGBA32,
223 picture, pix_fmt, width, height) < 0) {
227 img_copy(&picture1, picture, PIX_FMT_RGBA32, width, height);
230 imlib_image_set_has_alpha(0);
233 int wid, hig, h_a, v_a;
236 char *tbp = ci->text;
237 time_t now = time(0);
242 int fd = open(ci->file, O_RDONLY);
245 tbp = "[File not found]";
247 int l = read(fd, tbuff, sizeof(tbuff) - 1);
259 strftime(buff, sizeof(buff), tbp ? tbp : "[No data]", localtime(&now));
264 for (p = buff; p; p = q) {
269 imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
274 if (pix_fmt != PIX_FMT_RGBA32) {
275 if (img_convert(picture, pix_fmt,
276 &picture1, PIX_FMT_RGBA32, width, height) < 0) {
279 img_copy(picture, &picture1, PIX_FMT_RGBA32, width, height);