Added three sample video hooks. See the (rudimentary) documentation on what
[libav.git] / 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 <getopt.h>
49 #include <stdarg.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <sys/time.h>
53 #include <X11/Xlib.h>
54 #include <Imlib2.h>
55
56 #include "framehook.h"
57
58 typedef struct {
59 int dummy;
60 Imlib_Font fn;
61 char *text;
62 char *file;
63 int r, g, b;
64 int x;
65 int y;
66 struct _CachedImage *cache;
67 } ContextInfo;
68
69 typedef struct _CachedImage {
70 struct _CachedImage *next;
71 Imlib_Image image;
72 int width;
73 int height;
74 } CachedImage;
75
76
77 int Configure(void **ctxp, int argc, char *argv[])
78 {
79 int c;
80 ContextInfo *ci;
81 char *font = "LucidaSansDemiBold/16";
82 char *fp = getenv("FONTPATH");
83 char *color = 0;
84 FILE *f;
85
86 *ctxp = av_mallocz(sizeof(ContextInfo));
87 ci = (ContextInfo *) *ctxp;
88
89 optind = 0;
90
91 if (fp)
92 imlib_add_path_to_font_path(fp);
93
94 while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
95 switch (c) {
96 case 'c':
97 color = optarg;
98 break;
99 case 'F':
100 font = optarg;
101 break;
102 case 't':
103 ci->text = strdup(optarg);
104 break;
105 case 'f':
106 ci->file = strdup(optarg);
107 break;
108 case 'x':
109 ci->x = atoi(optarg);
110 break;
111 case 'y':
112 ci->y = atoi(optarg);
113 break;
114 case '?':
115 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
116 return -1;
117 }
118 }
119
120 ci->fn = imlib_load_font(font);
121 if (!ci->fn) {
122 fprintf(stderr, "Failed to load font '%s'\n", font);
123 return -1;
124 }
125 imlib_context_set_font(ci->fn);
126 imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
127
128 if (color) {
129 char buff[256];
130 int done = 0;
131
132 f = fopen("/usr/lib/X11/rgb.txt", "r");
133 if (!f) {
134 fprintf(stderr, "Failed to find rgb.txt\n");
135 return -1;
136 }
137 while (fgets(buff, sizeof(buff), f)) {
138 int r, g, b;
139 char colname[80];
140
141 if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
142 strcasecmp(colname, color) == 0) {
143 ci->r = r;
144 ci->g = g;
145 ci->b = b;
146 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
147 done = 1;
148 break;
149 }
150 }
151 fclose(f);
152 if (!done) {
153 fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
154 return -1;
155 }
156 }
157 imlib_context_set_color(ci->r, ci->g, ci->b, 255);
158 return 0;
159 }
160
161 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
162 {
163 CachedImage *cache;
164
165 for (cache = ci->cache; cache; cache = cache->next) {
166 if (width == cache->width && height == cache->height)
167 return cache->image;
168 }
169
170 return NULL;
171 }
172
173 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
174 {
175 CachedImage *cache = av_mallocz(sizeof(*cache));
176
177 cache->image = image;
178 cache->width = width;
179 cache->height = height;
180 cache->next = ci->cache;
181 ci->cache = cache;
182 }
183
184 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
185 {
186 ContextInfo *ci = (ContextInfo *) ctx;
187 AVPicture picture1;
188 Imlib_Image image;
189 DATA32 *data;
190
191 image = get_cached_image(ci, width, height);
192
193 if (!image) {
194 image = imlib_create_image(width, height);
195 put_cached_image(ci, image, width, height);
196 }
197
198 imlib_context_set_image(image);
199 data = imlib_image_get_data();
200
201 if (pix_fmt != PIX_FMT_BGRA32) {
202 avpicture_fill(&picture1, (UINT8 *) data, PIX_FMT_BGRA32, width, height);
203 if (img_convert(&picture1, PIX_FMT_BGRA32,
204 picture, pix_fmt, width, height) < 0) {
205 goto done;
206 }
207 } else {
208 av_abort();
209 }
210
211 imlib_image_set_has_alpha(0);
212
213 {
214 int wid, hig, h_a, v_a;
215 char buff[1000];
216 char tbuff[1000];
217 char *tbp = ci->text;
218 time_t now = time(0);
219 char *p, *q;
220 int x, y;
221
222 if (ci->file) {
223 int fd = open(ci->file, O_RDONLY);
224
225 if (fd < 0) {
226 tbp = "[File not found]";
227 } else {
228 int l = read(fd, tbuff, sizeof(tbuff) - 1);
229
230 if (l >= 0) {
231 tbuff[l] = 0;
232 tbp = tbuff;
233 } else {
234 tbp = "[I/O Error]";
235 }
236 close(fd);
237 }
238 }
239
240 strftime(buff, sizeof(buff), tbp, localtime(&now));
241
242 x = ci->x;
243 y = ci->y;
244
245 for (p = buff; p; p = q) {
246 q = strchr(p, '\n');
247 if (q)
248 *q++ = 0;
249
250 imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
251 y += v_a;
252 }
253 }
254
255 if (pix_fmt != PIX_FMT_BGRA32) {
256 if (img_convert(picture, pix_fmt,
257 &picture1, PIX_FMT_BGRA32, width, height) < 0) {
258 }
259 }
260
261 done:
262 ;
263 }
264
265 /* To ensure correct typing */
266 FrameHookConfigureFn ConfigureFn = Configure;
267 FrameHookProcessFn ProcessFn = Process;