linux怎么开启摄像头(linux怎么打开摄像头)

纸扎戏偶

本篇文章给大家谈谈linux怎么开启摄像头,以及linux怎么打开摄像头对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。

本文目录一览:

  • 1、如何在linux下使用摄像头
  • 2、linux下怎么样进行摄像头编程
  • 3、linux下怎样进行摄像头编程
  • 4、如何在Linux下开发摄像头驱动
  • 5、华为mate booklinuxr5摄像头怎么打开?
  • 6、怎样在嵌入式Linux系统中使用摄像头

1、如何在linux下使用摄像头

首先下载spca5xx-20060202.tar.gz包。

将其解压缩:

$tar -zxvf spca5xx-20060202.tar.gz

spca5xx包已经预编译过了,所以进入解压缩目录后,编译安装就行了:

$make make install

然后输入:

$modprobe spca5xx

无提示表明模块安装成功。

好了,安装完成了,现在试下^_^

$spcaview

下面是我用摄像头拍下的自己的照片,质量明显没有windows下,不过还是不错^_^

2、linux下怎么样进行摄像头编程

在linux下所有设备都是文件。所以对摄像头的操作其实就是对文件的操作。USB摄像头的设备文件就是在/dev目录下的video0(假如只有一个摄像头)。在linux下操作摄像头就是使用v4l2对摄像头进行的操作,操作步骤如下

打开设备文件。

int fd=open(”/dev/video0″,O_RDWR);

2. 取得设备的capability,看看设备具有什么功能,比如是否具有输入,或者音频输入输出等。VIDIOC_QUERYCAP,struct v4l2_capability

v4l2_std_id std;

do {

ret= ioctl(fd, VIDIOC_QUERYSTD, std);

} while (ret == -1  errno == EAGAIN);

switch (std) {

case V4L2_STD_NTSC:

//……

case V4L2_STD_PAL:

//……

}

3. 选择输入,一个设备可以有多个输入。VIDIOC_S_INPUT,struct v4l2_input(可不要)

4. 设置的制式和帧格式,制式包括PAL,NTSC,帧的格式个包括宽度和高度等。

VIDIOC_S_STD,VIDIOC_S_FMT,struct v4l2_std_id,struct v4l2_format

struct v4l2_format fmt;

memset ( fmt, 0, sizeof(fmt) );

fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

fmt.fmt.pix.width = 320;

fmt.fmt.pix.height = 240;

fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG;

if (ioctl(fd, VIDIOC_S_FMT, fmt) 0)

{

printf("set format failed\n");

//return 0;

}

5. 向驱动申请帧缓冲,一般不超过5个。struct v4l2_requestbuffers

struct v4l2_requestbuffers req;

memset(req, 0, sizeof (req));

req.count = 4;

req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

req.memory = V4L2_MEMORY_MMAP;

if (ioctl(fd,VIDIOC_REQBUFS,req) == -1)

{

perror("VIDIOC_REQBUFS error \n");

//return -1;

}

6.申请物理内存

将申请到的帧缓冲映射到用户空间,这样就可以直接操作采集到的帧了,而不必去复制。将申请到的帧缓冲全部入队列,以便存放采集到的数据.VIDIOC_QBUF,struct v4l2_buffer

VideoBuffer* buffers = calloc( req.count, sizeof(VideoBuffer) );

printf("sizeof(VideoBuffer) is %d\n",sizeof(VideoBuffer));

struct v4l2_buffer buf;

for (numBufs = 0; numBufs req.count; numBufs++)

{

memset( buf, 0, sizeof(buf) );

buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

buf.memory = V4L2_MEMORY_MMAP;

buf.index = numBufs;

if (ioctl(fd, VIDIOC_QUERYBUF, buf) 0)

{

printf("VIDIOC_QUERYBUF error\n");

//return -1;

}

printf("buf len is %d\n",sizeof(buf));

//内存映射

buffers[numBufs].length = buf.length;

buffers[numBufs].offset = (size_t) buf.m.offset;

buffers[numBufs].start = mmap (NULL, buf.length,PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset);

printf("buffers.length = %d,buffers.offset = %d ,buffers.start[0] = %d\n",buffers[numBufs].length,buffers[numBufs].offset,buffers[numBufs].start[0]);

printf("buf2 len is %d\n",sizeof(buffers[numBufs].start));

if (buffers[numBufs].start == MAP_FAILED)

{

perror("buffers error\n");

//return -1;

}

if (ioctl (fd, VIDIOC_QBUF, buf) 0)

{

printf("VIDIOC_QBUF error\n");

//return -1;

}

}

7. 开始的采集。

enum v4l2_buf_type type;

type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

if (ioctl (fd, VIDIOC_STREAMON, type) 0)

{

printf("VIDIOC_STREAMON error\n");

// return -1;

}

8. 出队列以取得已采集数据的帧缓冲,取得原始采集数据。VIDIOC_DQBUF, 将缓冲重新入队列尾,这样可以循环采集。VIDIOC_QBUF

if (ioctl(fd, VIDIOC_DQBUF, buf) 0)

{

perror("VIDIOC_DQBUF failed.\n");

//return -1;

}

buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

buf.memory = V4L2_MEMORY_MMAP;

unsigned char *ptcur = buffers[numBufs].start;

DEBUG("buf.bytesused = %d \n",buf.bytesused);

int i1;

for(i1=0; i1buf.bytesused; i1++)

{

if((buffers[numBufs].start[i1] == 0xFF)  (buffers[numBufs].start[i1+1] == 0xC4))

{

DEBUG("huffman table finded! \nbuf.bytesused = %d\nFFC4 = %d \n",buf.bytesused,i1);

break;

}

}

if(i1 == buf.bytesused)printf("huffman table don't exist! \n");

int i;

for(i=0; ibuf.bytesused; i++)

{

if((buffers[numBufs].start[i] == 0xFF)  (buffers[numBufs].start[i+1] == 0xD8)) break;

ptcur++;

}

DEBUG("i=%d,FF=%02x,D8=%02x\n",i,buffers[numBufs].start[i],buffers[numBufs].start[i+1]);

int imagesize =buf.bytesused - i;

DEBUG("buf.bytesused = %d \n",buf.bytesused);

DEBUG ("imagesize = %d \n",imagesize);

9. 停止的采集。VIDIOC_STREAMOFF

10. 关闭设备。close(fd);

3、linux下怎样进行摄像头编程

在linux下所有设备都是文件。所以对摄像头的操作其实就是对文件的操作。USB摄像头的设备文件就是在/dev目录下的video0(假如只有一个摄像头)。在linux下操作摄像头就是使用v4l2对摄像头进行的操作,操作步骤如下

打开设备文件。

int fd=open(”/dev/video0″,O_RDWR);

2. 取得设备的capability,看看设备具有什么功能,比如是否具有输入,或者音频输入输出等。VIDIOC_QUERYCAP,struct v4l2_capability

v4l2_std_id std;

do {

ret= ioctl(fd, VIDIOC_QUERYSTD, std);

} while (ret == -1  errno == EAGAIN);

switch (std) {

case V4L2_STD_NTSC:

//……

case V4L2_STD_PAL:

//……

}

3. 选择输入,一个设备可以有多个输入。VIDIOC_S_INPUT,struct v4l2_input(可不要)

4. 设置的制式和帧格式,制式包括PAL,NTSC,帧的格式个包括宽度和高度等。

VIDIOC_S_STD,VIDIOC_S_FMT,struct v4l2_std_id,struct v4l2_format

struct v4l2_format fmt;

memset ( fmt, 0, sizeof(fmt) );

fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

fmt.fmt.pix.width = 320;

fmt.fmt.pix.height = 240;

fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG;

if (ioctl(fd, VIDIOC_S_FMT, fmt) 0)

{

printf("set format failed\n");

//return 0;

}

5. 向驱动申请帧缓冲,一般不超过5个。struct v4l2_requestbuffers

struct v4l2_requestbuffers req;

memset(req, 0, sizeof (req));

req.count = 4;

req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

req.memory = V4L2_MEMORY_MMAP;

if (ioctl(fd,VIDIOC_REQBUFS,req) == -1)

{

perror("VIDIOC_REQBUFS error \n");

//return -1;

}

6.申请物理内存

将申请到的帧缓冲映射到用户空间,这样就可以直接操作采集到的帧了,而不必去复制。将申请到的帧缓冲全部入队列,以便存放采集到的数据.VIDIOC_QBUF,struct v4l2_buffer

VideoBuffer* buffers = calloc( req.count, sizeof(VideoBuffer) );

printf("sizeof(VideoBuffer) is %d\n",sizeof(VideoBuffer));

struct v4l2_buffer buf;

for (numBufs = 0; numBufs req.count; numBufs++)

{

memset( buf, 0, sizeof(buf) );

buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

buf.memory = V4L2_MEMORY_MMAP;

buf.index = numBufs;

if (ioctl(fd, VIDIOC_QUERYBUF, buf) 0)

{

printf("VIDIOC_QUERYBUF error\n");

//return -1;

}

printf("buf len is %d\n",sizeof(buf));

//内存映射

buffers[numBufs].length = buf.length;

buffers[numBufs].offset = (size_t) buf.m.offset;

buffers[numBufs].start = mmap (NULL, buf.length,PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset);

printf("buffers.length = %d,buffers.offset = %d ,buffers.start[0] = %d\n",buffers[numBufs].length,buffers[numBufs].offset,buffers[numBufs].start[0]);

printf("buf2 len is %d\n",sizeof(buffers[numBufs].start));

if (buffers[numBufs].start == MAP_FAILED)

{

perror("buffers error\n");

//return -1;

}

if (ioctl (fd, VIDIOC_QBUF, buf) 0)

{

printf("VIDIOC_QBUF error\n");

//return -1;

}

}

7. 开始的采集。

enum v4l2_buf_type type;

type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

if (ioctl (fd, VIDIOC_STREAMON, type) 0)

{

printf("VIDIOC_STREAMON error\n");

// return -1;

}

8. 出队列以取得已采集数据的帧缓冲,取得原始采集数据。VIDIOC_DQBUF, 将缓冲重新入队列尾,这样可以循环采集。VIDIOC_QBUF

if (ioctl(fd, VIDIOC_DQBUF, buf) 0)

{

perror("VIDIOC_DQBUF failed.\n");

//return -1;

}

buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

buf.memory = V4L2_MEMORY_MMAP;

unsigned char *ptcur = buffers[numBufs].start;

DEBUG("buf.bytesused = %d \n",buf.bytesused);

int i1;

for(i1=0; i1buf.bytesused; i1++)

{

if((buffers[numBufs].start[i1] == 0xFF)  (buffers[numBufs].start[i1+1] == 0xC4))

{

DEBUG("huffman table finded! \nbuf.bytesused = %d\nFFC4 = %d \n",buf.bytesused,i1);

break;

}

}

if(i1 == buf.bytesused)printf("huffman table don't exist! \n");

int i;

for(i=0; ibuf.bytesused; i++)

{

if((buffers[numBufs].start[i] == 0xFF)  (buffers[numBufs].start[i+1] == 0xD8)) break;

ptcur++;

}

DEBUG("i=%d,FF=%02x,D8=%02x\n",i,buffers[numBufs].start[i],buffers[numBufs].start[i+1]);

int imagesize =buf.bytesused - i;

DEBUG("buf.bytesused = %d \n",buf.bytesused);

DEBUG ("imagesize = %d \n",imagesize);

9. 停止的采集。VIDIOC_STREAMOFF

10. 关闭设备。close(fd);

4、如何在Linux下开发摄像头驱动

在linux下所有设备都是文件。所以对摄像头的操作其实就是对文件的操作。USB摄像头的设备文件就是在/dev目录下的video0(假如只有一个摄像头)。在linux下操作摄像头就是使用v4l2对摄像头进行视频的操作,操作步骤如下

1. 打开设备文件。

int fd=open(”/dev/video0″,O_RDWR);

2. 取得设备的capability,看看设备具有什么功能,比如是否具有视频输入,或者音频输入输出等。VIDIOC_QUERYCAP,struct v4l2_capability

v4l2_std_id std;

do {

ret= ioctl(fd, VIDIOC_QUERYSTD, std);

} while (ret == -1 errno == EAGAIN);

switch (std) {

case V4L2_STD_NTSC:

//……

case V4L2_STD_PAL:

//……

}

3. 选择视频输入,一个视频设备可以有多个视频输入。VIDIOC_S_INPUT,struct v4l2_input(可不要)

4. 设置视频的制式和帧格式,制式包括PAL,NTSC,帧的格式个包括宽度和高度等。

VIDIOC_S_STD,VIDIOC_S_FMT,struct v4l2_std_id,struct v4l2_format

struct v4l2_format fmt;

memset ( fmt, 0, sizeof(fmt) );

fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

fmt.fmt.pix.width = 320;

fmt.fmt.pix.height = 240;

fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG;

if (ioctl(fd, VIDIOC_S_FMT, fmt) 0)

{

printf("set format failed\n");

//return 0;

}

5. 向驱动申请帧缓冲,一般不超过5个。struct v4l2_requestbuffers

struct v4l2_requestbuffers req;

memset(req, 0, sizeof (req));

req.count = 4;

req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

req.memory = V4L2_MEMORY_MMAP;

if (ioctl(fd,VIDIOC_REQBUFS,req) == -1)

{

perror("VIDIOC_REQBUFS error \n");

//return -1;

}

6.申请物理内存

将申请到的帧缓冲映射到用户空间,这样就可以直接操作采集到的帧了,而不必去复制。将申请到的帧缓冲全部入队列,以便存放采集到的数据.VIDIOC_QBUF,struct v4l2_buffer

VideoBuffer* buffers = calloc( req.count, sizeof(VideoBuffer) );

printf("sizeof(VideoBuffer) is %d\n",sizeof(VideoBuffer));

struct v4l2_buffer buf;

for (numBufs = 0; numBufs req.count; numBufs++)

{

memset( buf, 0, sizeof(buf) );

buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

buf.memory = V4L2_MEMORY_MMAP;

buf.index = numBufs;

if (ioctl(fd, VIDIOC_QUERYBUF, buf) 0)

{

printf("VIDIOC_QUERYBUF error\n");

//return -1;

}

printf("buf len is %d\n",sizeof(buf));

//内存映射

buffers[numBufs].length = buf.length;

buffers[numBufs].offset = (size_t) buf.m.offset;

buffers[numBufs].start = mmap (NULL, buf.length,PROT_READ | PROT_WRITE, MAP_SHARED, fd, buf.m.offset);

printf("buffers.length = %d,buffers.offset = %d ,buffers.start[0] = %d\n",buffers[numBufs].length,buffers[numBufs].offset,buffers[numBufs].start[0]);

printf("buf2 len is %d\n",sizeof(buffers[numBufs].start));

if (buffers[numBufs].start == MAP_FAILED)

{

perror("buffers error\n");

//return -1;

}

if (ioctl (fd, VIDIOC_QBUF, buf) 0)

{

printf("VIDIOC_QBUF error\n");

//return -1;

}

}

7. 开始视频的采集。

enum v4l2_buf_type type;

type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

if (ioctl (fd, VIDIOC_STREAMON, type) 0)

{

printf("VIDIOC_STREAMON error\n");

// return -1;

}

8. 出队列以取得已采集数据的帧缓冲,取得原始采集数据。VIDIOC_DQBUF, 将缓冲重新入队列尾,这样可以循环采集。VIDIOC_QBUF

if (ioctl(fd, VIDIOC_DQBUF, buf) 0)

{

perror("VIDIOC_DQBUF failed.\n");

//return -1;

}

buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

buf.memory = V4L2_MEMORY_MMAP;

unsigned char *ptcur = buffers[numBufs].start;

DEBUG("buf.bytesused = %d \n",buf.bytesused);

int i1;

for(i1=0; i1buf.bytesused; i1++)

{

if((buffers[numBufs].start[i1] == 0x000000FF) (buffers[numBufs].start[i1+1] == 0x000000C4))

{

DEBUG("huffman table finded! \nbuf.bytesused = %d\nFFC4 = %d \n",buf.bytesused,i1);

break;

}

}

if(i1 == buf.bytesused)printf("huffman table don't exist! \n");

int i;

for(i=0; ibuf.bytesused; i++)

{

if((buffers[numBufs].start[i] == 0x000000FF) (buffers[numBufs].start[i+1] == 0x000000D8)) break;

ptcur++;

}

DEBUG("i=%d,FF=%02x,D8=%02x\n",i,buffers[numBufs].start[i],buffers[numBufs].start[i+1]);

int imagesize =buf.bytesused - i;

DEBUG("buf.bytesused = %d \n",buf.bytesused);

DEBUG ("imagesize = %d \n",imagesize);

9. 停止视频的采集。VIDIOC_STREAMOFF

10. 关闭视频设备。close(fd);

5、华为mate booklinuxr5摄像头怎么打开?

回答:点开相机图标,就可以看到 摄像头。

点击 摄像头一次,准备摄像,再点击一次开始摄像。

摄像过程中 点击摄像头(红点)一次,停止,再点击 继续。

6、怎样在嵌入式Linux系统中使用摄像头

在linux下所有设备都是文件。所以对摄像头的操作其实就是对文件的操作。USB摄像头的设备文件就是在/dev目录下的video0(假如只有一个摄像头)。在linux下操作摄像头就是使用v4l2对摄像头进行视频的操作,操作步骤如下 1. 打开设备文件。 int fd=op

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