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