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a22f1cbc RD |
1 | /* Simple Video4Linux image grabber. */ |
2 | /* | |
3 | * Video4Linux Driver Test/Example Framegrabbing Program | |
4 | * | |
5 | * Compile with: | |
6 | * gcc -s -Wall -Wstrict-prototypes v4lgrab.c -o v4lgrab | |
f90c3c0b SH |
7 | * Use as: |
8 | * v4lgrab >image.ppm | |
a22f1cbc RD |
9 | * |
10 | * Copyright (C) 1998-05-03, Phil Blundell <philb@gnu.org> | |
f90c3c0b SH |
11 | * Copied from http://www.tazenda.demon.co.uk/phil/vgrabber.c |
12 | * with minor modifications (Dave Forrest, drf5n@virginia.edu). | |
13 | * | |
14 | * | |
15 | * For some cameras you may need to pre-load libv4l to perform | |
16 | * the necessary decompression, e.g.: | |
17 | * | |
18 | * export LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so | |
19 | * ./v4lgrab >image.ppm | |
20 | * | |
21 | * see http://hansdegoede.livejournal.com/3636.html for details. | |
a22f1cbc RD |
22 | * |
23 | */ | |
24 | ||
25 | #include <unistd.h> | |
26 | #include <sys/types.h> | |
27 | #include <sys/stat.h> | |
28 | #include <fcntl.h> | |
29 | #include <stdio.h> | |
30 | #include <sys/ioctl.h> | |
31 | #include <stdlib.h> | |
32 | ||
33 | #include <linux/types.h> | |
34 | #include <linux/videodev.h> | |
35 | ||
f90c3c0b | 36 | #define VIDEO_DEV "/dev/video0" |
a22f1cbc RD |
37 | |
38 | /* Stole this from tvset.c */ | |
39 | ||
40 | #define READ_VIDEO_PIXEL(buf, format, depth, r, g, b) \ | |
41 | { \ | |
42 | switch (format) \ | |
43 | { \ | |
44 | case VIDEO_PALETTE_GREY: \ | |
45 | switch (depth) \ | |
46 | { \ | |
47 | case 4: \ | |
48 | case 6: \ | |
49 | case 8: \ | |
50 | (r) = (g) = (b) = (*buf++ << 8);\ | |
51 | break; \ | |
52 | \ | |
53 | case 16: \ | |
54 | (r) = (g) = (b) = \ | |
55 | *((unsigned short *) buf); \ | |
56 | buf += 2; \ | |
57 | break; \ | |
58 | } \ | |
59 | break; \ | |
60 | \ | |
61 | \ | |
62 | case VIDEO_PALETTE_RGB565: \ | |
63 | { \ | |
64 | unsigned short tmp = *(unsigned short *)buf; \ | |
65 | (r) = tmp&0xF800; \ | |
66 | (g) = (tmp<<5)&0xFC00; \ | |
67 | (b) = (tmp<<11)&0xF800; \ | |
68 | buf += 2; \ | |
69 | } \ | |
70 | break; \ | |
71 | \ | |
72 | case VIDEO_PALETTE_RGB555: \ | |
73 | (r) = (buf[0]&0xF8)<<8; \ | |
74 | (g) = ((buf[0] << 5 | buf[1] >> 3)&0xF8)<<8; \ | |
75 | (b) = ((buf[1] << 2 ) & 0xF8)<<8; \ | |
76 | buf += 2; \ | |
77 | break; \ | |
78 | \ | |
79 | case VIDEO_PALETTE_RGB24: \ | |
80 | (r) = buf[0] << 8; (g) = buf[1] << 8; \ | |
81 | (b) = buf[2] << 8; \ | |
82 | buf += 3; \ | |
83 | break; \ | |
84 | \ | |
85 | default: \ | |
86 | fprintf(stderr, \ | |
87 | "Format %d not yet supported\n", \ | |
88 | format); \ | |
89 | } \ | |
90 | } | |
91 | ||
b7ed698c | 92 | static int get_brightness_adj(unsigned char *image, long size, int *brightness) { |
a22f1cbc RD |
93 | long i, tot = 0; |
94 | for (i=0;i<size*3;i++) | |
95 | tot += image[i]; | |
96 | *brightness = (128 - tot/(size*3))/3; | |
97 | return !((tot/(size*3)) >= 126 && (tot/(size*3)) <= 130); | |
98 | } | |
99 | ||
100 | int main(int argc, char ** argv) | |
101 | { | |
f90c3c0b | 102 | int fd = open(VIDEO_DEV, O_RDONLY), f; |
a22f1cbc RD |
103 | struct video_capability cap; |
104 | struct video_window win; | |
105 | struct video_picture vpic; | |
106 | ||
107 | unsigned char *buffer, *src; | |
aeecea26 MCC |
108 | int bpp = 24, r = 0, g = 0, b = 0; |
109 | unsigned int i, src_depth = 16; | |
a22f1cbc RD |
110 | |
111 | if (fd < 0) { | |
f90c3c0b | 112 | perror(VIDEO_DEV); |
a22f1cbc RD |
113 | exit(1); |
114 | } | |
115 | ||
116 | if (ioctl(fd, VIDIOCGCAP, &cap) < 0) { | |
117 | perror("VIDIOGCAP"); | |
f90c3c0b | 118 | fprintf(stderr, "(" VIDEO_DEV " not a video4linux device?)\n"); |
a22f1cbc RD |
119 | close(fd); |
120 | exit(1); | |
121 | } | |
122 | ||
123 | if (ioctl(fd, VIDIOCGWIN, &win) < 0) { | |
124 | perror("VIDIOCGWIN"); | |
125 | close(fd); | |
126 | exit(1); | |
127 | } | |
128 | ||
129 | if (ioctl(fd, VIDIOCGPICT, &vpic) < 0) { | |
130 | perror("VIDIOCGPICT"); | |
131 | close(fd); | |
132 | exit(1); | |
133 | } | |
134 | ||
135 | if (cap.type & VID_TYPE_MONOCHROME) { | |
136 | vpic.depth=8; | |
137 | vpic.palette=VIDEO_PALETTE_GREY; /* 8bit grey */ | |
138 | if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) { | |
139 | vpic.depth=6; | |
140 | if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) { | |
141 | vpic.depth=4; | |
142 | if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) { | |
143 | fprintf(stderr, "Unable to find a supported capture format.\n"); | |
144 | close(fd); | |
145 | exit(1); | |
146 | } | |
147 | } | |
148 | } | |
149 | } else { | |
150 | vpic.depth=24; | |
151 | vpic.palette=VIDEO_PALETTE_RGB24; | |
152 | ||
153 | if(ioctl(fd, VIDIOCSPICT, &vpic) < 0) { | |
154 | vpic.palette=VIDEO_PALETTE_RGB565; | |
155 | vpic.depth=16; | |
156 | ||
157 | if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) { | |
158 | vpic.palette=VIDEO_PALETTE_RGB555; | |
159 | vpic.depth=15; | |
160 | ||
161 | if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) { | |
162 | fprintf(stderr, "Unable to find a supported capture format.\n"); | |
163 | return -1; | |
164 | } | |
165 | } | |
166 | } | |
167 | } | |
168 | ||
169 | buffer = malloc(win.width * win.height * bpp); | |
170 | if (!buffer) { | |
171 | fprintf(stderr, "Out of memory.\n"); | |
172 | exit(1); | |
173 | } | |
174 | ||
175 | do { | |
176 | int newbright; | |
177 | read(fd, buffer, win.width * win.height * bpp); | |
178 | f = get_brightness_adj(buffer, win.width * win.height, &newbright); | |
179 | if (f) { | |
180 | vpic.brightness += (newbright << 8); | |
181 | if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) { | |
182 | perror("VIDIOSPICT"); | |
183 | break; | |
184 | } | |
185 | } | |
186 | } while (f); | |
187 | ||
188 | fprintf(stdout, "P6\n%d %d 255\n", win.width, win.height); | |
189 | ||
190 | src = buffer; | |
191 | ||
192 | for (i = 0; i < win.width * win.height; i++) { | |
193 | READ_VIDEO_PIXEL(src, vpic.palette, src_depth, r, g, b); | |
194 | fputc(r>>8, stdout); | |
195 | fputc(g>>8, stdout); | |
196 | fputc(b>>8, stdout); | |
197 | } | |
198 | ||
199 | close(fd); | |
200 | return 0; | |
201 | } |