友善之臂视频监控方案源码学习(5) - 输入控制(7)

90. led = IN_CMD_LED_ON;

91. } else if ( strcmp("off", optarg) == 0 ) {

92. led = IN_CMD_LED_OFF;

93. } else if ( strcmp("auto", optarg) == 0 ) {

94. led = IN_CMD_LED_AUTO;

95. } else if ( strcmp("blink", optarg) == 0 ) {

96. led = IN_CMD_LED_BLINK;

97. }

98. break;

99.

100. default:

101. DBG("default case\n");

102. help();

103. return 1;

104. }

注：步骤(c)和(d)是在while(1)循环内检测的。

第四，使全局指针指向param->param->global

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2. /* keep a pointer to the global variables */ pglobal = param->global;

这一步非常重要，视频数据信息就存储在global结构的buf变量中。

第五，构建videoIn结构

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6. videoIn = malloc(sizeof(struct vdIn)); if ( videoIn == NULL ) { IPRINT("not enough memory for videoIn\n"); exit(EXIT_FAILURE); } memset(videoIn, 0, sizeof(struct vdIn));

该结构描述如下：

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1. struct vdIn {