diff options
Diffstat (limited to 'Documentation/DocBook/media/v4l/v4l2grab.c.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/v4l2grab.c.xml | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/Documentation/DocBook/media/v4l/v4l2grab.c.xml b/Documentation/DocBook/media/v4l/v4l2grab.c.xml deleted file mode 100644 index bed12e40be27..000000000000 --- a/Documentation/DocBook/media/v4l/v4l2grab.c.xml +++ /dev/null @@ -1,164 +0,0 @@ -<programlisting> -/* V4L2 video picture grabber - Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@infradead.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation version 2 of the License. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <fcntl.h> -#include <errno.h> -#include <sys/ioctl.h> -#include <sys/types.h> -#include <sys/time.h> -#include <sys/mman.h> -#include <linux/videodev2.h> -#include "../libv4l/include/libv4l2.h" - -#define CLEAR(x) memset(&(x), 0, sizeof(x)) - -struct buffer { - void *start; - size_t length; -}; - -static void xioctl(int fh, int request, void *arg) -{ - int r; - - do { - r = v4l2_ioctl(fh, request, arg); - } while (r == -1 && ((errno == EINTR) || (errno == EAGAIN))); - - if (r == -1) { - fprintf(stderr, "error %d, %s\n", errno, strerror(errno)); - exit(EXIT_FAILURE); - } -} - -int main(int argc, char **argv) -{ - struct <link linkend="v4l2-format">v4l2_format</link> fmt; - struct <link linkend="v4l2-buffer">v4l2_buffer</link> buf; - struct <link linkend="v4l2-requestbuffers">v4l2_requestbuffers</link> req; - enum <link linkend="v4l2-buf-type">v4l2_buf_type</link> type; - fd_set fds; - struct timeval tv; - int r, fd = -1; - unsigned int i, n_buffers; - char *dev_name = "/dev/video0"; - char out_name[256]; - FILE *fout; - struct buffer *buffers; - - fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0); - if (fd < 0) { - perror("Cannot open device"); - exit(EXIT_FAILURE); - } - - CLEAR(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_RGB24; - fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; - xioctl(fd, VIDIOC_S_FMT, &fmt); - if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_RGB24) { - printf("Libv4l didn't accept RGB24 format. Can't proceed.\n"); - exit(EXIT_FAILURE); - } - if ((fmt.fmt.pix.width != 640) || (fmt.fmt.pix.height != 480)) - printf("Warning: driver is sending image at %dx%d\n", - fmt.fmt.pix.width, fmt.fmt.pix.height); - - CLEAR(req); - req.count = 2; - req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - req.memory = V4L2_MEMORY_MMAP; - xioctl(fd, VIDIOC_REQBUFS, &req); - - buffers = calloc(req.count, sizeof(*buffers)); - for (n_buffers = 0; n_buffers < req.count; ++n_buffers) { - CLEAR(buf); - - buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - buf.memory = V4L2_MEMORY_MMAP; - buf.index = n_buffers; - - xioctl(fd, VIDIOC_QUERYBUF, &buf); - - buffers[n_buffers].length = buf.length; - buffers[n_buffers].start = v4l2_mmap(NULL, buf.length, - PROT_READ | PROT_WRITE, MAP_SHARED, - fd, buf.m.offset); - - if (MAP_FAILED == buffers[n_buffers].start) { - perror("mmap"); - exit(EXIT_FAILURE); - } - } - - for (i = 0; i < n_buffers; ++i) { - CLEAR(buf); - buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - buf.memory = V4L2_MEMORY_MMAP; - buf.index = i; - xioctl(fd, VIDIOC_QBUF, &buf); - } - type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - - xioctl(fd, VIDIOC_STREAMON, &type); - for (i = 0; i < 20; i++) { - do { - FD_ZERO(&fds); - FD_SET(fd, &fds); - - /* Timeout. */ - tv.tv_sec = 2; - tv.tv_usec = 0; - - r = select(fd + 1, &fds, NULL, NULL, &tv); - } while ((r == -1 && (errno = EINTR))); - if (r == -1) { - perror("select"); - return errno; - } - - CLEAR(buf); - buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - buf.memory = V4L2_MEMORY_MMAP; - xioctl(fd, VIDIOC_DQBUF, &buf); - - sprintf(out_name, "out%03d.ppm", i); - fout = fopen(out_name, "w"); - if (!fout) { - perror("Cannot open image"); - exit(EXIT_FAILURE); - } - fprintf(fout, "P6\n%d %d 255\n", - fmt.fmt.pix.width, fmt.fmt.pix.height); - fwrite(buffers[buf.index].start, buf.bytesused, 1, fout); - fclose(fout); - - xioctl(fd, VIDIOC_QBUF, &buf); - } - - type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - xioctl(fd, VIDIOC_STREAMOFF, &type); - for (i = 0; i < n_buffers; ++i) - v4l2_munmap(buffers[i].start, buffers[i].length); - v4l2_close(fd); - - return 0; -} -</programlisting> |