doorbell
view doorbelld/src/main.c @ 5:f21ae31ef0e7
craptacular
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 15 Mar 2016 08:35:21 +0200 |
| parents | 08ea0abdbb8a |
| children | dc4018af3a40 |
line source
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <errno.h>
5 #include <signal.h>
6 #include <pthread.h>
7 #include <wcam.h>
8 #include "srv.h"
10 void *frame_proc(void *arg);
11 int save_image(const char *fname, unsigned char *pixels, int xsz, int ysz);
12 void sighandler(int s);
13 int parse_args(int argc, char **argv);
15 const char *devfile = "/dev/video0";
16 int fd = -1;
17 int port = 2828;
18 int width = 640;
19 int height = 480;
20 int framerate = 30;
21 unsigned char *frame;
22 int done;
23 int frame_available;
24 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
25 pthread_cond_t condvar = PTHREAD_COND_INITIALIZER;
27 int main(int argc, char **argv)
28 {
29 pthread_t thread;
31 if(parse_args(argc, argv) == -1) {
32 return 1;
33 }
35 signal(SIGINT, sighandler);
36 signal(SIGQUIT, sighandler);
37 signal(SIGSEGV, sighandler);
39 if(srv_init(port) == -1) {
40 return 1;
41 }
43 if(!(frame = malloc(width * height * 4))) {
44 perror("failed to allocate frame");
45 return 1;
46 }
47 if(devfile) {
48 if((fd = wcam_open(devfile, width, height, framerate)) == -1) {
49 fprintf(stderr, "failed to open video device: %s\n", devfile);
50 return 1;
51 }
52 wcam_start(fd);
53 } else {
54 int i, j;
55 unsigned char *pptr = frame;
56 for(i=0; i<height; i++) {
57 for(j=0; j<width; j++) {
58 int p = (i ^ j) & 0xff;
59 pptr[0] = p;
60 pptr[1] = p << 1;
61 pptr[2] = p << 2;
62 pptr[3] = 255;
63 pptr += 4;
64 }
65 }
66 printf("serving test pattern\n");
67 }
69 if(pthread_create(&thread, 0, frame_proc, 0) == -1) {
70 fprintf(stderr, "failed to create frame processing thread\n");
71 return 1;
72 }
74 while(!done) {
75 int i, res;
76 int *sock = srv_sockets();
77 int num_sockets = srv_num_sockets();
78 int maxfd = srv_max_socket();
79 fd_set rdset;
81 FD_ZERO(&rdset);
83 if(fd != -1) {
84 if(fd > maxfd) maxfd = fd;
85 FD_SET(fd, &rdset);
86 printf("select on socket: %d (video)\n", fd);
87 }
89 for(i=0; i<num_sockets; i++) {
90 FD_SET(sock[i], &rdset);
91 printf("select on socket: %d\n", sock[i]);
92 }
94 while((res = select(maxfd + 1, &rdset, 0, 0, 0)) == -1 &&
95 errno == EINTR && !done);
96 if(done) break;
97 if(res == -1) {
98 fprintf(stderr, "unexpected failure while waiting for I/O\n");
99 break;
100 }
101 printf("res: %d\n", res);
103 if(fd != -1 && FD_ISSET(fd, &rdset)) {
104 wcam_wait(fd);
105 pthread_mutex_lock(&mutex);
106 frame_available = 1;
107 pthread_mutex_unlock(&mutex);
108 pthread_cond_signal(&condvar);
109 }
111 for(i=0; i<num_sockets; i++) {
112 if(FD_ISSET(sock[i], &rdset)) {
113 srv_handle(sock[i]);
114 if(fd == -1) {
115 pthread_mutex_lock(&mutex);
116 frame_available = 1;
117 pthread_mutex_unlock(&mutex);
118 pthread_cond_signal(&condvar);
119 }
120 }
121 }
122 }
124 frame_available = 1;
125 pthread_cond_signal(&condvar);
126 pthread_join(thread, 0);
127 free(frame);
128 if(fd != -1) {
129 wcam_stop(fd);
130 wcam_close(fd);
131 }
132 return 0;
133 }
135 void *frame_proc(void *arg)
136 {
137 for(;;) {
138 pthread_mutex_lock(&mutex);
139 while(!frame_available) {
140 pthread_cond_wait(&condvar, &mutex);
141 }
142 frame_available = 0;
143 pthread_mutex_unlock(&mutex);
145 if(done) break;
147 if(fd != -1) {
148 wcam_read_frame_rgb(fd, frame);
149 /*save_image("output.ppm", frame, width, height);*/
150 }
151 srv_send_frame(frame, width, height);
152 }
153 return 0;
154 }
156 int save_image(const char *fname, unsigned char *pixels, int xsz, int ysz)
157 {
158 int i, num_pixels = xsz * ysz;
159 FILE *fp = fopen(fname, "wb");
160 if(!fp) return -1;
162 fprintf(fp, "P6\n%d %d\n255\n", xsz, ysz);
163 for(i=0; i<num_pixels; i++) {
164 fputc(*pixels++, fp);
165 fputc(*pixels++, fp);
166 fputc(*pixels++, fp);
167 ++pixels;
168 }
169 fclose(fp);
170 return 0;
171 }
173 void sighandler(int s)
174 {
175 done = 1;
176 }
178 void print_usage(const char *argv0)
179 {
180 printf("Usage: %s [options]\n", argv0);
181 printf("options:\n");
182 printf(" -s,-size <WxH>\n");
183 printf(" -f,-fps <framerate>\n");
184 printf(" -d,-device <devfile>\n");
185 printf(" -p,-port <port>\n");
186 printf(" -novideo\n");
187 printf(" -h,-help\n");
188 }
190 int parse_args(int argc, char **argv)
191 {
192 int i;
194 for(i=1; i<argc; i++) {
195 if(argv[i][0] == '-') {
196 if(strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "-size") == 0) {
197 if(sscanf(argv[++i], "%dx%d", &width, &height) != 2) {
198 fprintf(stderr, "invalid size specified: %s\n", argv[i - 1]);
199 return -1;
200 }
201 } else if(strcmp(argv[i], "-f") == 0 || strcmp(argv[i], "-fps") == 0) {
202 framerate = atoi(argv[++i]);
203 if(framerate <= 0) {
204 fprintf(stderr, "invalid framerate specified: %s\n", argv[i - 1]);
205 return -1;
206 }
207 } else if(strcmp(argv[i], "-novideo") == 0) {
208 devfile = 0;
209 } else if(strcmp(argv[i], "-d") == 0 || strcmp(argv[i], "-device") == 0) {
210 devfile = argv[++i];
211 } else if(strcmp(argv[i], "-p") == 0 || strcmp(argv[i], "-port") == 0) {
212 port = atoi(argv[++i]);
213 if(port <= 0 || port >= 65535) {
214 fprintf(stderr, "invalid port specified: %s\n", argv[i - 1]);
215 return -1;
216 }
217 } else {
218 int help = strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0;
219 if(!help) fprintf(stderr, "unrecognized option: %s\n", argv[i]);
220 print_usage(argv[0]);
221 exit(help ? 0 : 1);
222 }
223 } else {
224 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
225 print_usage(argv[0]);
226 return -1;
227 }
228 }
229 return 0;
230 }