cam2fb_file.c

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/*
 * CAMIF test
 *
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <linux/videodev.h>

#define CAM_WIDTH 240
#define CAM_HEIGHT 240
//#define CAM_WIDTH 640
//#define CAM_HEIGHT 480

#define CAM_TO_FILE

static int cam_fp = -1;
static char *cam_mmap = NULL;


static inline int camera_init(void)
{
	int dev_fp = -1;

	dev_fp  = open("/dev/video0",O_RDWR);
	if (dev_fp < 0) {
		printf("open /dev/video0 error\n");
		return -1;
	}
	printf("video device opened (%d)\n",dev_fp);
	return dev_fp;
}


int main(int argc, char *argv[])
{
	int frame = 0;
	int ret;
	int i;
	
	FILE *filedata;
	
	struct video_capture v_capture;
	struct video_mbuf v_mbuf;
	struct video_mmap v_mmap;
	struct video_capability cap;
	struct video_picture pict;
	
	// write to file
	filedata = fopen("still.YUV", "wb+");
	if(!filedata){
		printf("picmmap.yuv open error\n");
		return 0;
	}
	printf("file.yuv opened \n");


	if ((cam_fp = camera_init()) < 0) //open
		goto err;

/// 
	ret = ioctl(cam_fp,VIDIOCGCAP,&cap);
	if(1){
		printf("cap:ch=%d,max=%d:%d,min=%d:%d\n",
			cap.channels, 
			cap.maxwidth, cap.maxheight,
			cap.minwidth, cap.minheight);
		printf("cap:[%s]\n",cap.name);
		printf("cap:0x%X\n",cap.type);
	}

///	
	ret = ioctl(cam_fp,VIDIOCGCAPTURE,&v_capture);
	if(1){
		printf("capture:offset:%d:%d.\n",v_capture.x, v_capture.y);
		printf("w=%d,h=%d\n",v_capture.width, v_capture.height);
		printf("decimation=0x%x\n",v_capture.decimation);
		printf("flags=%d\n",v_capture.flags);
	}

	
	v_capture.x = 0;
	v_capture.y = 0;
	v_capture.width = CAM_WIDTH;
	v_capture.height = CAM_HEIGHT;
	v_capture.flags = VIDEO_CAPTURE_ODD;	
	v_capture.decimation = VIDEO_CAPTURE_ODD;
	ret = ioctl(cam_fp,VIDIOCSCAPTURE,&v_capture);
	
	
	ret = ioctl(cam_fp,VIDIOCGCAPTURE,&v_capture);
	if(1){
		printf("capture:offset:%d:%d.\n",v_capture.x, v_capture.y);
		printf("w=%d,h=%d\n",v_capture.width, v_capture.height);
		printf("decimation=0x%x\n",v_capture.decimation);
		printf("flags=%d\n",v_capture.flags);
	}
///	

	ret = ioctl(cam_fp,VIDIOCGPICT,&pict);
	printf("pict:brightness=%d:hue=%d.\n",pict.brightness,pict.hue);
	printf(":color=%d,contrast=%d\n",pict.colour,pict.contrast);
	printf(":whiteness=%d,depth=%d\n",pict.whiteness,pict.depth);
	printf(":palette=0x%X\n",pict.palette);

	pict.palette = VIDEO_PALETTE_YUV420;
	ret = ioctl(cam_fp,VIDIOCSPICT,&pict);

	ret = ioctl(cam_fp,VIDIOCGPICT,&pict);
	printf("pict:brightness=%d:hue=%d.\n",pict.brightness,pict.hue);
	printf(":color=%d,contrast=%d\n",pict.colour,pict.contrast);
	printf(":whiteness=%d,depth=%d\n",pict.whiteness,pict.depth);
	printf(":palette=0x%X\n",pict.palette);

	
	
// get mbuf attribute
	if ((ret = ioctl(cam_fp,VIDIOCGMBUF,&v_mbuf)) < 0)
	{
		printf("get mbuf attribute error, ret(%d)\n",ret);
		goto err;
	} 	
	printf("video_mbuf:size=%d frames=%d\n",v_mbuf.size,v_mbuf.frames);

//mmap
	cam_mmap = (char*)mmap(0, v_mbuf.size, 
			PROT_READ | PROT_WRITE, 
			MAP_SHARED, cam_fp, 0);
	if(cam_mmap < 0){
		printf("mmap() video error\n");
		return -1;
	}
	
	i = 3;
	while(i){
		//v_mmap.frame = 0;
		v_mmap.frame = frame;
		v_mmap.width = CAM_WIDTH;
		v_mmap.height = CAM_HEIGHT;
		v_mmap.format = VIDEO_PALETTE_YUV420;
		printf("i=%d\n",i);
		
		if ((ret =ioctl(cam_fp,VIDIOCMCAPTURE,&v_mmap)) < 0)
		{
			printf("get capture error, ret(%d)\n",ret);
			goto err;
		} 
		
		while(ioctl(cam_fp, VIDIOCSYNC, &frame) < 0){
			sleep(1);
			printf("sleep 1s\n");
		}
		
		if(i == 1){
			//fwrite(cam_mmap, 1, v_capture.width*v_capture.height*3/2, filedata);
			fwrite(cam_mmap, 1, 240*360, filedata);
			printf("a picture ok\n");		
		}
		
		frame = (frame == 0)?1:0; //next frame
		i--;
	}
	

err:
	fclose(filedata);

	if(cam_mmap)
		munmap(cam_mmap, v_mbuf.size);
	
	if(cam_fp)
		close(cam_fp);

	printf("done.\n");
	return 0;
}