Linux下V4L2一个调试问题方法（拍照偏绿）
2013-08-16 10:36
330 查看
一、源码
1.test.c
1.gcc test.c -o test
2../test
3.ll v4l2test/
三、极力推荐一款window下的图像查看工具YUVviewerPlus
该工具可以将原始yuyv（如yuv422选择yuy2，需要后缀改为.yuv），rgb（rgb24选择gbmp24，需要后缀改为.bmp）等数据文件显示出来。
另外说明：yuyv和jpeg数据大小为width*height*2；rgb为width*height*3；单位为Bytes。
附免费下载地址：http://download.csdn.net/detail/tankai19880619/6617647
1.test.c
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/videodev2.h>
#include "test.h"
int fd = 0;
int v4l2QueryControl(int control, struct v4l2_queryctrl *queryctrl)
{
int err =0;
queryctrl->id = control;
if ((err= ioctl(fd, VIDIOC_QUERYCTRL, queryctrl)) < 0) {
printf("ioctl querycontrol error %d,%d \n",errno,control);
} else if (queryctrl->flags & V4L2_CTRL_FLAG_DISABLED) {
printf("control %s disabled \n", (char *) queryctrl->name);
} else if (queryctrl->flags & V4L2_CTRL_TYPE_BOOLEAN) {
return 1;
} else if (queryctrl->type & V4L2_CTRL_TYPE_INTEGER) {
return 0;
} else {
printf("contol %s unsupported \n", (char *) queryctrl->name);
}
return -1;
}
int v4l2GetControl(int control)
{
struct v4l2_queryctrl queryctrl;
struct v4l2_control control_s;
int err;
if (v4l2QueryControl(control, &queryctrl) < 0)
return -1;
control_s.id = control;
if ((err = ioctl(fd, VIDIOC_G_CTRL, &control_s)) < 0) {
printf("ioctl get control error\n");
return -1;
}
return control_s.value;
}
int main(){
//////
int result = mkdir("./v4l2test/",S_IFDIR+S_ISGID+S_IRWXU+S_IRWXG+S_IRWXO);
/////////////1280*720 mjpeg
fd = open("/dev/video0",O_RDWR,0);
printf("TK------->>>fd is %d\n",fd);
//////
struct v4l2_capability cap;
ioctl(fd,VIDIOC_QUERYCAP,&cap);
printf("TK---------->>>>>Driver Name:%s\nCard Name:%s\nBus info:%s\n",cap.driver,cap.card,cap.bus_info);
//////
struct v4l2_fmtdesc fmtdesc;
fmtdesc.index = 0; fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
while(ioctl(fd,VIDIOC_ENUM_FMT,&fmtdesc) != -1){
printf("TK-------->>>>>fmtdesc.description is %s\n",fmtdesc.description);
fmtdesc.index ++;
}
//////
struct v4l2_format fmt;
memset(&fmt,0,sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 1280;
fmt.fmt.pix.height = 720;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG;
fmt.fmt.pix.field = V4L2_FIELD_NONE;//V4L2_FIELD_INTERLACED;
fmt.fmt.pix.colorspace = 8;
int fmtreslt = ioctl(fd,VIDIOC_S_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_G_FMT,&fmt);
printf("TK----------->>>>>fmt.fmt.width is %d\nfmt.fmt.pix.height is %d\nfmt.fmt.pix.colorspace is %d\n",fmt.fmt.pix.width,fmt.fmt.pix.height,fmt.fmt.pix.colorspace);
////////////////////////////////////////////////start
struct v4l2_requestbuffers req;
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
ioctl(fd,VIDIOC_REQBUFS,&req);
struct buffer{
void *start;
unsigned int length;
}*buffers;
buffers = (struct buffer*)calloc (req.count, sizeof(*buffers));
unsigned int n_buffers = 0;
for(n_buffers = 0; n_buffers < req.count; ++n_buffers){
struct v4l2_buffer buf;
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
if(ioctl(fd,VIDIOC_QUERYBUF,&buf) == -1){
printf("TK---------_>>>>>>error\n");
close(fd);
exit(-1);
}
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = mmap(NULL,buf.length,PROT_READ|PROT_WRITE,MAP_SHARED,fd,buf.m.offset);
if(MAP_FAILED == buffers[n_buffers].start){
printf("TK--------__>>>>>error 2\n");
close(fd);
exit(-1);
}
}
////
unsigned int i;
enum v4l2_buf_type type;
for(i = 0; i < 4; i++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
ioctl(fd,VIDIOC_QBUF,&buf);
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_STREAMON,&type);
////
unsigned int j;
for(j = 0; j < 4; j++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
ioctl(fd,VIDIOC_DQBUF,&buf);
char path[30];
snprintf(path,sizeof(path),"./v4l2test/720pmjpeg%d",buf.index);
int fdyuyv = open(path,O_WRONLY|O_CREAT,00700);
printf("TK--------->>>>fdyuyv is %d\n",fdyuyv);
int resultyuyv = write(fdyuyv,buffers[buf.index].start,1280*720*2);
printf("TK--------->>>resultyuyv is %d\n",resultyuyv);
close(fdyuyv);
}
ioctl(fd,VIDIOC_STREAMOFF,&type);
for(i = 0; i < 4; i++)
munmap(buffers[i].start,buffers[i].length);
free(buffers);
usleep(10000);
close(fd);
///////////////////////////////////////////////////////////////////////////end
//////1280*720 yuyv
fd = open("/dev/video0",O_RDWR,0);
printf("TK------------>>>start 2222222222222222\n");
ioctl(fd, VIDIOC_QUERYCAP, &cap);
memset(&fmt,0,sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 1280;
fmt.fmt.pix.height = 720;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_NONE;//V4L2_FIELD_INTERLACED;
fmt.fmt.pix.colorspace = 8;
fmtreslt = ioctl(fd,VIDIOC_S_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmtreslt = ioctl(fd,VIDIOC_TRY_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_G_FMT,&fmt);
printf("TK----------->>>>>fmt.fmt.width is %d\nfmt.fmt.pix.height is %d\nfmt.fmt.pix.colorspace is %d\n",fmt.fmt.pix.width,fmt.fmt.pix.height,fmt.fmt.pix.colorspace);
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
ioctl(fd,VIDIOC_REQBUFS,&req);
buffers = (struct buffer*)calloc (req.count, sizeof(*buffers));
for(n_buffers = 0; n_buffers < req.count; ++n_buffers){
struct v4l2_buffer buf;
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
if(ioctl(fd,VIDIOC_QUERYBUF,&buf) == -1){
printf("TK---------_>>>>>>error\n");
close(fd);
exit(-1);
}
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = mmap(NULL,buf.length,PROT_READ|PROT_WRITE,MAP_SHARED,fd,buf.m.offset);
if(MAP_FAILED == buffers[n_buffers].start){
printf("TK--------__>>>>>error 2\n");
close(fd);
exit(-1);
}
}
for(i = 0; i < 4; i++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
ioctl(fd,VIDIOC_QBUF,&buf);
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_STREAMON,&type);
for(j = 0; j < 4; j++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
ioctl(fd,VIDIOC_DQBUF,&buf);
char path[30];
snprintf(path,sizeof(path),"./v4l2test/720pyuyv%d",buf.index);
int fdyuyv = open(path,O_WRONLY|O_CREAT,00700);
printf("TK--------->>>>fdyuyv is %d\n",fdyuyv);
printf("TK--------->>>>>buffers[buf.index].start is 0x%x\n",buffers[buf.index].start);
int resultyuyv = write(fdyuyv,buffers[buf.index].start,1280*720*2);
printf("TK--------->>>resultyuyv is %d\n",resultyuyv);
close(fdyuyv);
}
printf("TK------->>>>v4l2GetControl(V4L2_CID_AUTO_FOCUS_STATUS) is %d\n",v4l2GetControl(V4L2_CID_AUTO_FOCUS_STATUS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_AUTO_WHITE_BALANCE) is %d\n",v4l2GetControl(V4L2_CID_AUTO_WHITE_BALANCE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_BACKLIGHT_COMPENSATION) is %d\n",v4l2GetControl(V4L2_CID_BACKLIGHT_COMPENSATION));
printf("TK------->>>>v4l2GetControl(V4L2_CID_BRIGHTNESS) is %d\n",v4l2GetControl(V4L2_CID_BRIGHTNESS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_COLORFX) is %d\n",v4l2GetControl(V4L2_CID_COLORFX));
printf("TK------->>>>v4l2GetControl(V4L2_CID_CONTRAST) is %d\n",v4l2GetControl(V4L2_CID_CONTRAST));
printf("TK------->>>>v4l2GetControl(V4L2_CID_DO_WHITE_BALANCE) is %d\n",v4l2GetControl(V4L2_CID_DO_WHITE_BALANCE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE_ABSOLUTE) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE_ABSOLUTE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE_AUTO) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE_AUTO));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE_AUTO_PRIORITY) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE_AUTO_PRIORITY));
printf("TK------->>>>v4l2GetControl(V4L2_CID_FOCUS_ABSOLUTE) is %d\n",v4l2GetControl(V4L2_CID_FOCUS_ABSOLUTE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_FOCUS_AUTO) is %d\n",v4l2GetControl(V4L2_CID_FOCUS_AUTO));
printf("TK------->>>>v4l2GetControl(V4L2_CID_HFLIP) is %d\n",v4l2GetControl(V4L2_CID_HFLIP));
printf("TK------->>>>v4l2GetControl(V4L2_CID_POWER_LINE_FREQUENCY) is %d\n",v4l2GetControl(V4L2_CID_POWER_LINE_FREQUENCY));
printf("TK------->>>>v4l2GetControl(V4L2_CID_SATURATION) is %d\n",v4l2GetControl(V4L2_CID_SATURATION));
printf("TK------->>>>v4l2GetControl(V4L2_CID_SHARPNESS) is %d\n",v4l2GetControl(V4L2_CID_SHARPNESS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_WHITENESS) is %d\n",v4l2GetControl(V4L2_CID_WHITENESS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_ZOOM_ABSOLUTE) is %d\n",v4l2GetControl(V4L2_CID_ZOOM_ABSOLUTE));
ioctl(fd,VIDIOC_STREAMOFF,&type);
for(i = 0; i < 4; i++)
munmap(buffers[i].start,buffers[i].length);
free(buffers);
usleep(10000);
close(fd);
/////////end
//////640*480 mjpeg
fd = open("/dev/video0",O_RDWR,0);
printf("TK------------>>>start 3333333333333\n");
ioctl(fd, VIDIOC_QUERYCAP, &cap);
memset(&fmt,0,sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 640;
fmt.fmt.pix.height = 480;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG;
fmt.fmt.pix.field = V4L2_FIELD_NONE;//V4L2_FIELD_INTERLACED;
fmt.fmt.pix.colorspace = 8;
fmtreslt = ioctl(fd,VIDIOC_S_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmtreslt = ioctl(fd,VIDIOC_TRY_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_G_FMT,&fmt);
printf("TK----------->>>>>fmt.fmt.width is %d\nfmt.fmt.pix.height is %d\nfmt.fmt.pix.colorspace is %d\n",fmt.fmt.pix.width,fmt.fmt.pix.height,fmt.fmt.pix.colorspace);
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
ioctl(fd,VIDIOC_REQBUFS,&req);
buffers = (struct buffer*)calloc (req.count, sizeof(*buffers));
for(n_buffers = 0; n_buffers < req.count; ++n_buffers){
struct v4l2_buffer buf;
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
if(ioctl(fd,VIDIOC_QUERYBUF,&buf) == -1){
printf("TK---------_>>>>>>error\n");
close(fd);
exit(-1);
}
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = mmap(NULL,buf.length,PROT_READ|PROT_WRITE,MAP_SHARED,fd,buf.m.offset);
if(MAP_FAILED == buffers[n_buffers].start){
printf("TK--------__>>>>>error 2\n");
close(fd);
exit(-1);
}
}
for(i = 0; i < 4; i++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
ioctl(fd,VIDIOC_QBUF,&buf);
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_STREAMON,&type);
for(j = 0; j < 4; j++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
ioctl(fd,VIDIOC_DQBUF,&buf);
char path[30];
snprintf(path,sizeof(path),"./v4l2test/480pmjpeg%d",buf.index);
int fdyuyv = open(path,O_WRONLY|O_CREAT,00700);
printf("TK--------->>>>fdyuyv is %d\n",fdyuyv);
printf("TK--------->>>>>buffers[buf.index].start is 0x%x\n",buffers[buf.index].start);
int resultyuyv = write(fdyuyv,buffers[buf.index].start,640*480*2);
printf("TK--------->>>resultyuyv is %d\n",resultyuyv);
close(fdyuyv);
}
ioctl(fd,VIDIOC_STREAMOFF,&type);
for(i = 0; i < 4; i++)
munmap(buffers[i].start,buffers[i].length);
free(buffers);
usleep(10000);
close(fd);
/////////end
//////640*480 yuyv
fd = open("/dev/video0",O_RDWR,0);
printf("TK------------>>>start 444444444444\n");
ioctl(fd, VIDIOC_QUERYCAP, &cap);
memset(&fmt,0,sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = 640;
fmt.fmt.pix.height = 480;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_NONE;//V4L2_FIELD_INTERLACED;
fmt.fmt.pix.colorspace = 8;
fmtreslt = ioctl(fd,VIDIOC_S_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmtreslt = ioctl(fd,VIDIOC_TRY_FMT,&fmt);
printf("TK--------_>>>>fmtreslt is %d\n",fmtreslt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_G_FMT,&fmt);
printf("TK----------->>>>>fmt.fmt.width is %d\nfmt.fmt.pix.height is %d\nfmt.fmt.pix.colorspace is %d\n",fmt.fmt.pix.width,fmt.fmt.pix.height,fmt.fmt.pix.colorspace);
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
ioctl(fd,VIDIOC_REQBUFS,&req);
buffers = (struct buffer*)calloc (req.count, sizeof(*buffers));
for(n_buffers = 0; n_buffers < req.count; ++n_buffers){
struct v4l2_buffer buf;
memset(&buf,0,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = n_buffers;
if(ioctl(fd,VIDIOC_QUERYBUF,&buf) == -1){
printf("TK---------_>>>>>>error\n");
close(fd);
exit(-1);
}
buffers[n_buffers].length = buf.length;
buffers[n_buffers].start = mmap(NULL,buf.length,PROT_READ|PROT_WRITE,MAP_SHARED,fd,buf.m.offset);
if(MAP_FAILED == buffers[n_buffers].start){
printf("TK--------__>>>>>error 2\n");
close(fd);
exit(-1);
}
}
for(i = 0; i < 4; i++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
ioctl(fd,VIDIOC_QBUF,&buf);
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ioctl(fd,VIDIOC_STREAMON,&type);
for(j = 0; j < 4; j++){
struct v4l2_buffer buf;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
ioctl(fd,VIDIOC_DQBUF,&buf);
char path[30];
snprintf(path,sizeof(path),"./v4l2test/480pyuyv%d",buf.index);
int fdyuyv = open(path,O_WRONLY|O_CREAT,00700);
printf("TK--------->>>>fdyuyv is %d\n",fdyuyv);
printf("TK--------->>>>>buffers[buf.index].start is 0x%x\n",buffers[buf.index].start);
int resultyuyv = write(fdyuyv,buffers[buf.index].start,640*480*2);
printf("TK--------->>>resultyuyv is %d\n",resultyuyv);
close(fdyuyv);
}
printf("TK------->>>>v4l2GetControl(V4L2_CID_AUTO_FOCUS_STATUS) is %d\n",v4l2GetControl(V4L2_CID_AUTO_FOCUS_STATUS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_AUTO_WHITE_BALANCE) is %d\n",v4l2GetControl(V4L2_CID_AUTO_WHITE_BALANCE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_BACKLIGHT_COMPENSATION) is %d\n",v4l2GetControl(V4L2_CID_BACKLIGHT_COMPENSATION));
printf("TK------->>>>v4l2GetControl(V4L2_CID_BRIGHTNESS) is %d\n",v4l2GetControl(V4L2_CID_BRIGHTNESS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_COLORFX) is %d\n",v4l2GetControl(V4L2_CID_COLORFX));
printf("TK------->>>>v4l2GetControl(V4L2_CID_CONTRAST) is %d\n",v4l2GetControl(V4L2_CID_CONTRAST));
printf("TK------->>>>v4l2GetControl(V4L2_CID_DO_WHITE_BALANCE) is %d\n",v4l2GetControl(V4L2_CID_DO_WHITE_BALANCE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE_ABSOLUTE) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE_ABSOLUTE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE_AUTO) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE_AUTO));
printf("TK------->>>>v4l2GetControl(V4L2_CID_EXPOSURE_AUTO_PRIORITY) is %d\n",v4l2GetControl(V4L2_CID_EXPOSURE_AUTO_PRIORITY));
printf("TK------->>>>v4l2GetControl(V4L2_CID_FOCUS_ABSOLUTE) is %d\n",v4l2GetControl(V4L2_CID_FOCUS_ABSOLUTE));
printf("TK------->>>>v4l2GetControl(V4L2_CID_FOCUS_AUTO) is %d\n",v4l2GetControl(V4L2_CID_FOCUS_AUTO));
printf("TK------->>>>v4l2GetControl(V4L2_CID_HFLIP) is %d\n",v4l2GetControl(V4L2_CID_HFLIP));
printf("TK------->>>>v4l2GetControl(V4L2_CID_POWER_LINE_FREQUENCY) is %d\n",v4l2GetControl(V4L2_CID_POWER_LINE_FREQUENCY));
printf("TK------->>>>v4l2GetControl(V4L2_CID_SATURATION) is %d\n",v4l2GetControl(V4L2_CID_SATURATION));
printf("TK------->>>>v4l2GetControl(V4L2_CID_SHARPNESS) is %d\n",v4l2GetControl(V4L2_CID_SHARPNESS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_WHITENESS) is %d\n",v4l2GetControl(V4L2_CID_WHITENESS));
printf("TK------->>>>v4l2GetControl(V4L2_CID_ZOOM_ABSOLUTE) is %d\n",v4l2GetControl(V4L2_CID_ZOOM_ABSOLUTE));
ioctl(fd,VIDIOC_STREAMOFF,&type);
for(i = 0; i < 4; i++)
munmap(buffers[i].start,buffers[i].length);
free(buffers);
usleep(10000);
close(fd);
/////////end
return 0;
}2.test.h#define V4L2_CID_AUTO_FOCUS_STATUS (V4L2_CID_CAMERA_CLASS_BASE+30)二、编译及测试
1.gcc test.c -o test
2../test
3.ll v4l2test/
drwxr-xr-x 2 root root 4096 2013-08-16 09:27 ./ drwxr-xr-x 3 root root 4096 2013-08-16 10:24 ../ -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pmjpeg0* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pmjpeg1* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pmjpeg2* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pmjpeg3* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pyuyv0* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pyuyv1* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pyuyv2* -rwxrwxrwx 1 root root 614400 2013-08-16 09:27 480pyuyv3* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pmjpeg0* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pmjpeg1* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pmjpeg2* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pmjpeg3* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pyuyv0* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pyuyv1* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pyuyv2* -rwxrwxrwx 1 root root 1843200 2013-08-16 09:27 720pyuyv3*
三、极力推荐一款window下的图像查看工具YUVviewerPlus
该工具可以将原始yuyv（如yuv422选择yuy2，需要后缀改为.yuv），rgb（rgb24选择gbmp24，需要后缀改为.bmp）等数据文件显示出来。
另外说明：yuyv和jpeg数据大小为width*height*2；rgb为width*height*3；单位为Bytes。
附免费下载地址：http://download.csdn.net/detail/tankai19880619/6617647
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