友善之臂视频监控方案源码学习(5) - 输入控制(3)

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4. int argc=1, width=640, height=480, fps=5, format=V4L2_PIX_FMT_MJPEG, i; in_cmd_type led = IN_CMD_LED_AUTO; char fourcc[5]={0,0,0,0,0};

第二，初始化互斥锁：

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5. /* initialize the mutes variable */ if( pthread_mutex_init(&controls_mutex, NULL) != 0 ) { IPRINT("could not initialize mutex variable\n"); exit(EXIT_FAILURE); }

第三，参数解析。参数解析又分为下面几个步骤：

(a) 读取参数

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5. argv[0] = INPUT_PLUGIN_NAME; if ( param->parameter_string != NULL && strlen(param->parameter_string) != 0 ) { char *arg=NULL, *saveptr=NULL, *token=NULL; arg=(char *)strdup(param->parameter_string);

(b) 将字符串形式的参数分解为字符串数组

[html] view plaincopy 1. if ( strchr(arg, ' ') != NULL ) {

2. token=strtok_r(arg, " ", &saveptr);

3. if ( token != NULL ) {

4. argv[argc] = strdup(token);

5. argc++;

6. while ( (token=strtok_r(NULL, " ", &saveptr)) != NULL ) { 7. argv[argc] = strdup(token);

8. argc++;

9. if (argc >= MAX_ARGUMENTS) {

10. IPRINT("ERROR: too many arguments to input plugin\n"); 11. return 1;

12. }