友善之臂视频监控方案源码学习(5) - 输入控制(8)

2. int fd;

3. char *videodevice ;

4. unsigned char *pFramebuffer;

5. unsigned char *ptframe[OUTFRMNUMB];

6. unsigned char *mem[NB_BUFFER];

7.

8. int framelock[OUTFRMNUMB];

9. pthread_mutex_t grabmutex;

10. int framesizeIn ; 11. volatile int frame_cour;

12. int bppIn;

13. int hdrwidth; 14. int hdrheight;

15. int formatIn;

16. int signalquit;

17. struct v4l2_capability cap;

18. struct v4l2_format fmt;

19. struct v4l2_buffer buf;

20. struct v4l2_requestbuffers rb;

21.

22. int grayscale;

23. uint32_t quality;

24.

25. };

主要定义了视频输入控制变量。

第六，打开视频设备

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5.

6. /* open video device and prepare data structure */ if (init_videoIn(videoIn, dev, width, height, fps, format, 1) < 0) { IPRINT("init_VideoIn failed\n"); closelog(); exit(EXIT_FAILURE); }

init_videoIn具体实现如下：

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1. int init_videoIn(struct vdIn *vd, char *device, int width, int height, int fps, int format, int grabmethod)