struct v4l2_requestbuffers req = 0; req.count = 4; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_MMAP; if (ioctl(fd, VIDIOC_REQBUFS, &req) < 0) perror("VIDIOC_REQBUFS"); close(fd); return 1;

void *buffers[req.count]; struct v4l2_buffer buf; for (int i = 0; i < req.count; ++i) memset(&buf, 0, sizeof(buf)); buf.type = req.type; buf.memory = V4L2_MEMORY_MMAP; buf.index = i; if (ioctl(fd, VIDIOC_QUERYBUF, &buf) < 0) perror("VIDIOC_QUERYBUF"); close(fd); return 1; buffers[i] = mmap(NULL, buf.length, PROT_READ

struct v4l2_format fmt = 0; 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; if (ioctl(fd, VIDIOC_S_FMT, &fmt) < 0) perror("VIDIOC_S_FMT"); close(fd); return 1;

int main() const char *dev = "/dev/video0"; int fd = open(dev, O_RDWR); if (fd < 0) perror("open"); return 1;

enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE; ioctl(fd, VIDIOC_STREAMON, &type); memset(&buf, 0, sizeof(buf)); buf.type = req.type; buf.memory = V4L2_MEMORY_MMAP; if (ioctl(fd, VIDIOC_DQBUF, &buf) < 0) perror("VIDIOC_DQBUF"); else FILE *out = fopen("frame.jpg","wb"); fwrite(buffers[buf.index], 1, buf.bytesused, out); fclose(out); ioctl(fd, VIDIOC_QBUF, &buf); ioctl(fd, VIDIOC_STREAMOFF, &type); for (int i=0;i<req.count;++i) munmap(buffers[i], buf.length); close(fd); return 0;

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