doorbell

annotate doorbelld/src/main.c @ 4:08ea0abdbb8a

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argument parsing
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 14 Mar 2016 04:20:59 +0200
parents d3f2a2b19504
children f21ae31ef0e7
rev   line source
nuclear@2 1 #include <stdio.h>
nuclear@2 2 #include <stdlib.h>
nuclear@2 3 #include <string.h>
nuclear@2 4 #include <errno.h>
nuclear@2 5 #include <signal.h>
nuclear@2 6 #include <pthread.h>
nuclear@2 7 #include <wcam.h>
nuclear@2 8 #include "srv.h"
nuclear@2 9
nuclear@2 10 void *frame_proc(void *arg);
nuclear@2 11 int save_image(const char *fname, unsigned char *pixels, int xsz, int ysz);
nuclear@2 12 void sighandler(int s);
nuclear@4 13 int parse_args(int argc, char **argv);
nuclear@2 14
nuclear@4 15 const char *devfile = "/dev/video0";
nuclear@4 16 int fd = -1;
nuclear@4 17 int port = 2828;
nuclear@2 18 int width = 640;
nuclear@2 19 int height = 480;
nuclear@2 20 int framerate = 30;
nuclear@2 21 unsigned char *frame;
nuclear@2 22 int done;
nuclear@2 23 int frame_available;
nuclear@2 24 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
nuclear@2 25 pthread_cond_t condvar = PTHREAD_COND_INITIALIZER;
nuclear@2 26
nuclear@2 27 int main(int argc, char **argv)
nuclear@2 28 {
nuclear@2 29 pthread_t thread;
nuclear@2 30
nuclear@4 31 if(parse_args(argc, argv) == -1) {
nuclear@4 32 return 1;
nuclear@2 33 }
nuclear@2 34
nuclear@2 35 signal(SIGINT, sighandler);
nuclear@2 36 signal(SIGQUIT, sighandler);
nuclear@2 37 signal(SIGSEGV, sighandler);
nuclear@2 38
nuclear@4 39 if(srv_init(port) == -1) {
nuclear@2 40 return 1;
nuclear@2 41 }
nuclear@2 42
nuclear@2 43 if(!(frame = malloc(width * height * 4))) {
nuclear@2 44 perror("failed to allocate frame");
nuclear@2 45 return 1;
nuclear@2 46 }
nuclear@4 47 if(devfile) {
nuclear@4 48 if((fd = wcam_open(devfile, width, height, framerate)) == -1) {
nuclear@4 49 fprintf(stderr, "failed to open video device: %s\n", devfile);
nuclear@4 50 return 1;
nuclear@4 51 }
nuclear@4 52 wcam_start(fd);
nuclear@4 53 } else {
nuclear@4 54 int i, j;
nuclear@4 55 unsigned char *pptr = frame;
nuclear@4 56 for(i=0; i<height; i++) {
nuclear@4 57 for(j=0; j<width; j++) {
nuclear@4 58 int p = (i ^ j) & 0xff;
nuclear@4 59 pptr[0] = p;
nuclear@4 60 pptr[1] = p << 1;
nuclear@4 61 pptr[2] = p << 2;
nuclear@4 62 pptr[3] = 255;
nuclear@4 63 pptr += 4;
nuclear@4 64 }
nuclear@4 65 }
nuclear@4 66 printf("serving test pattern\n");
nuclear@4 67 save_image("output.ppm", frame, width, height);
nuclear@2 68 }
nuclear@2 69
nuclear@2 70 if(pthread_create(&thread, 0, frame_proc, 0) == -1) {
nuclear@2 71 fprintf(stderr, "failed to create frame processing thread\n");
nuclear@2 72 return 1;
nuclear@2 73 }
nuclear@2 74
nuclear@2 75 while(!done) {
nuclear@2 76 int i, res;
nuclear@2 77 int *sock = srv_sockets();
nuclear@2 78 int num_sockets = srv_num_sockets();
nuclear@2 79 int maxfd = srv_max_socket();
nuclear@2 80 fd_set rdset;
nuclear@2 81
nuclear@4 82 FD_ZERO(&rdset);
nuclear@2 83
nuclear@4 84 if(fd != -1) {
nuclear@4 85 if(fd > maxfd) maxfd = fd;
nuclear@4 86 FD_SET(fd, &rdset);
nuclear@4 87 printf("select on socket: %d (video)\n", fd);
nuclear@4 88 }
nuclear@2 89
nuclear@2 90 for(i=0; i<num_sockets; i++) {
nuclear@2 91 FD_SET(sock[i], &rdset);
nuclear@4 92 printf("select on socket: %d\n", sock[i]);
nuclear@2 93 }
nuclear@2 94
nuclear@4 95 while((res = select(maxfd + 1, &rdset, 0, 0, 0)) == -1 &&
nuclear@4 96 errno == EINTR && !done);
nuclear@4 97 if(done) break;
nuclear@2 98 if(res == -1) {
nuclear@2 99 fprintf(stderr, "unexpected failure while waiting for I/O\n");
nuclear@2 100 break;
nuclear@2 101 }
nuclear@4 102 printf("res: %d\n", res);
nuclear@2 103
nuclear@4 104 if(fd != -1 && FD_ISSET(fd, &rdset)) {
nuclear@2 105 wcam_wait(fd);
nuclear@2 106 pthread_mutex_lock(&mutex);
nuclear@2 107 frame_available = 1;
nuclear@2 108 pthread_mutex_unlock(&mutex);
nuclear@2 109 pthread_cond_signal(&condvar);
nuclear@2 110 }
nuclear@2 111
nuclear@2 112 for(i=0; i<num_sockets; i++) {
nuclear@2 113 if(FD_ISSET(sock[i], &rdset)) {
nuclear@2 114 srv_handle(sock[i]);
nuclear@2 115 }
nuclear@2 116 }
nuclear@2 117 }
nuclear@2 118
nuclear@2 119 frame_available = 1;
nuclear@2 120 pthread_cond_signal(&condvar);
nuclear@2 121 pthread_join(thread, 0);
nuclear@2 122 free(frame);
nuclear@4 123 if(fd != -1) {
nuclear@4 124 wcam_stop(fd);
nuclear@4 125 wcam_close(fd);
nuclear@4 126 }
nuclear@2 127 return 0;
nuclear@2 128 }
nuclear@2 129
nuclear@2 130 void *frame_proc(void *arg)
nuclear@2 131 {
nuclear@2 132 for(;;) {
nuclear@2 133 pthread_mutex_lock(&mutex);
nuclear@2 134 while(!frame_available) {
nuclear@2 135 pthread_cond_wait(&condvar, &mutex);
nuclear@2 136 }
nuclear@2 137 frame_available = 0;
nuclear@2 138 pthread_mutex_unlock(&mutex);
nuclear@2 139
nuclear@2 140 if(done) break;
nuclear@2 141
nuclear@4 142 if(fd != -1) {
nuclear@4 143 wcam_read_frame_rgb(fd, frame);
nuclear@4 144 save_image("output.ppm", frame, width, height);
nuclear@4 145 }
nuclear@2 146 }
nuclear@2 147 return 0;
nuclear@2 148 }
nuclear@2 149
nuclear@2 150 int save_image(const char *fname, unsigned char *pixels, int xsz, int ysz)
nuclear@2 151 {
nuclear@2 152 int i, num_pixels = xsz * ysz;
nuclear@2 153 FILE *fp = fopen(fname, "wb");
nuclear@2 154 if(!fp) return -1;
nuclear@2 155
nuclear@2 156 fprintf(fp, "P6\n%d %d\n255\n", xsz, ysz);
nuclear@2 157 for(i=0; i<num_pixels; i++) {
nuclear@2 158 fputc(*pixels++, fp);
nuclear@2 159 fputc(*pixels++, fp);
nuclear@2 160 fputc(*pixels++, fp);
nuclear@2 161 ++pixels;
nuclear@2 162 }
nuclear@2 163 fclose(fp);
nuclear@2 164 return 0;
nuclear@2 165 }
nuclear@2 166
nuclear@2 167 void sighandler(int s)
nuclear@2 168 {
nuclear@2 169 done = 1;
nuclear@2 170 }
nuclear@4 171
nuclear@4 172 void print_usage(const char *argv0)
nuclear@4 173 {
nuclear@4 174 printf("Usage: %s [options]\n", argv0);
nuclear@4 175 printf("options:\n");
nuclear@4 176 printf(" -s,-size <WxH>\n");
nuclear@4 177 printf(" -f,-fps <framerate>\n");
nuclear@4 178 printf(" -d,-device <devfile>\n");
nuclear@4 179 printf(" -p,-port <port>\n");
nuclear@4 180 printf(" -novideo\n");
nuclear@4 181 printf(" -h,-help\n");
nuclear@4 182 }
nuclear@4 183
nuclear@4 184 int parse_args(int argc, char **argv)
nuclear@4 185 {
nuclear@4 186 int i;
nuclear@4 187
nuclear@4 188 for(i=1; i<argc; i++) {
nuclear@4 189 if(argv[i][0] == '-') {
nuclear@4 190 if(strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "-size") == 0) {
nuclear@4 191 if(sscanf(argv[++i], "%dx%d", &width, &height) != 2) {
nuclear@4 192 fprintf(stderr, "invalid size specified: %s\n", argv[i - 1]);
nuclear@4 193 return -1;
nuclear@4 194 }
nuclear@4 195 } else if(strcmp(argv[i], "-f") == 0 || strcmp(argv[i], "-fps") == 0) {
nuclear@4 196 framerate = atoi(argv[++i]);
nuclear@4 197 if(framerate <= 0) {
nuclear@4 198 fprintf(stderr, "invalid framerate specified: %s\n", argv[i - 1]);
nuclear@4 199 return -1;
nuclear@4 200 }
nuclear@4 201 } else if(strcmp(argv[i], "-novideo") == 0) {
nuclear@4 202 devfile = 0;
nuclear@4 203 } else if(strcmp(argv[i], "-d") == 0 || strcmp(argv[i], "-device") == 0) {
nuclear@4 204 devfile = argv[++i];
nuclear@4 205 } else if(strcmp(argv[i], "-p") == 0 || strcmp(argv[i], "-port") == 0) {
nuclear@4 206 port = atoi(argv[++i]);
nuclear@4 207 if(port <= 0 || port >= 65535) {
nuclear@4 208 fprintf(stderr, "invalid port specified: %s\n", argv[i - 1]);
nuclear@4 209 return -1;
nuclear@4 210 }
nuclear@4 211 } else {
nuclear@4 212 int help = strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0;
nuclear@4 213 if(!help) fprintf(stderr, "unrecognized option: %s\n", argv[i]);
nuclear@4 214 print_usage(argv[0]);
nuclear@4 215 exit(help ? 0 : 1);
nuclear@4 216 }
nuclear@4 217 } else {
nuclear@4 218 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@4 219 print_usage(argv[0]);
nuclear@4 220 return -1;
nuclear@4 221 }
nuclear@4 222 }
nuclear@4 223 return 0;
nuclear@4 224 }