main.c.bk

Video4Linux_test.rar 接視訊的範例程式

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "ccvt.h"

#include "v4l/v4l.h"
#define DEFAULT_PALETTE VIDEO_PALETTE_YUV420P
//#define DEFAULT_PALETTE VIDEO_PALETTE_RGB24

v4l_device vd;

int device_init(char *dev,int norm)
{
	int i;
	
	if(dev == NULL)
	{
		dev = "/dev/v4l/video0"; //set to default device
	}

	if(v4l_open(dev,&vd)) return -1;
	if(v4l_get_channels(&vd)) return -1;
		printf("test open 2\n");
	if(v4l_set_norm(&vd,norm)) return -1;
	if(v4l_mmap_init(&vd)) return -1;
	
	printf("%s: initialization Ok... %s\n %d channels \n %d audios \n"
					,dev,vd.capability.name,vd.capability.channels
					,vd.capability.audios);


	for(i=0;i<vd.capability.channels;i++)
	{
		printf("Channel %d: %s \n",i,vd.channel[i].name);
	}
	
	printf("v4l:mmap's address = %p\n",vd.map);
	printf("v4l:mmap's buffer size = 0x%x\n",vd.mbuf.size);
	printf("v4l:mmap's frames = %d(%d max)\n",vd.mbuf.frames,VIDEO_MAX_FRAME);
	

	for(i=0; i< vd.mbuf.frames;i++)
	{
		printf("v4l: frames %d's offset = 0x%x\n",i,vd.mbuf.offsets[i]);
	}

	//printf("v4l:chanel switch to %d (%s)\n",channel,vd.channel[channel].name);
	//start initialize grab
	if(v4l_get_picture(&vd)) return -1;
	if(v4l_set_palette(&vd,DEFAULT_PALETTE)) return -1;
	printf("test open 3\n");
	if(v4l_grab_init(&vd,240,320)) return -1;
	if(v4l_grab_sync(&vd)) return -1;
	
	printf("test open 4\n");
	
	return 0;
}

int device_grab_frame()
{
	vd.frame_current = 0;
	if(v4l_grab_frame(&vd,0) < 0)	return -1;

	return 0;
}

int device_next_frame()
{
	vd.frame_current ^= 1;
	if(v4l_grab_frame(&vd,vd.frame_current) < 0) return -1;

	return 0;
}

int main()
{
	unsigned char *img;
	unsigned char *img_out = malloc(320*240*3);
	FILE *fp;
  memset(img_out,0,sizeof(img_out));		
	if(device_init("/dev/v4l/video0",3) == -1)
	{
		perror("device_init:failed...\n");
		exit(1);
	}
	else
	{
		printf("OK!\n");
	

		//device_next_frame();
		//device_grab_frame();
		img = device_get_address(&vd);
		
		printf("img address is: %p \n",img);
		printf("img_out address is: %p \n",img_out);
		for(int i=0;i<320;i++) printf("%d\n",*(img_out+i));
		ccvt_420p_rgb24(240,320,img,img_out);
		
		printf("ccvt_420p_rgb24 OK!\n");
		fp = fopen("test.ppm","w");
		fprintf(fp,"P6\n240 320\n255\n");
		fwrite(img_out,240*3,320,fp);
		fclose(fp);
	}

	exit(0);	
}