2020-01-23 18:15:28 +01:00
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/videodev2.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <asm/errno.h>
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#include <gtk/gtk.h>
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2020-01-23 23:04:36 +01:00
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#include "ini.h"
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2020-01-23 18:15:28 +01:00
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enum io_method {
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IO_METHOD_READ,
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IO_METHOD_MMAP,
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IO_METHOD_USERPTR,
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};
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struct buffer {
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void *start;
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size_t length;
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};
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struct buffer *buffers;
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static unsigned int n_buffers;
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2020-01-23 23:04:36 +01:00
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static char *rear_dev_name;
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static char *front_dev_name;
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2020-01-23 18:15:28 +01:00
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static char *dev_name;
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static enum io_method io = IO_METHOD_MMAP;
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2020-01-23 23:04:36 +01:00
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static int preview_width = -1;
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static int preview_height = -1;
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static int preview_fmt = V4L2_PIX_FMT_RGB24;
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GObject *preview_image;
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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static int
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xioctl(int fd, int request, void *arg)
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{
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2020-01-23 18:15:28 +01:00
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int r;
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2020-01-23 23:04:36 +01:00
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do {
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r = ioctl(fd, request, arg);
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} while (r == -1 && errno == EINTR);
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2020-01-23 18:15:28 +01:00
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return r;
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}
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2020-01-23 23:04:36 +01:00
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static void
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errno_exit(const char *s)
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{
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2020-01-24 00:56:52 +01:00
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fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
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2020-01-23 18:15:28 +01:00
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exit(EXIT_FAILURE);
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}
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2020-01-23 23:04:36 +01:00
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static void
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start_capturing(int fd)
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{
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2020-01-23 18:15:28 +01:00
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enum v4l2_buf_type type;
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switch (io) {
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2020-01-23 23:04:36 +01:00
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case IO_METHOD_READ:
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/* Nothing to do. */
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break;
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case IO_METHOD_MMAP:
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for (int i = 0; i < n_buffers; ++i) {
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struct v4l2_buffer buf = {
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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.memory = V4L2_MEMORY_MMAP,
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.index = i,
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};
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if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
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errno_exit("VIDIOC_QBUF");
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2020-01-23 18:15:28 +01:00
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}
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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if (xioctl(fd, VIDIOC_STREAMON, &type) == -1) {
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errno_exit("VIDIOC_STREAMON");
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}
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break;
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case IO_METHOD_USERPTR:
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for (int i = 0; i < n_buffers; ++i) {
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struct v4l2_buffer buf = {
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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.memory = V4L2_MEMORY_USERPTR,
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.index = i,
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};
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buf.m.userptr = (unsigned long)buffers[i].start;
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buf.length = buffers[i].length;
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if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
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errno_exit("VIDIOC_QBUF");
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2020-01-23 18:15:28 +01:00
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}
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2020-01-23 23:04:36 +01:00
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}
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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if (xioctl(fd, VIDIOC_STREAMON, &type) == -1) {
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errno_exit("VIDIOC_STREAMON");
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}
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break;
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2020-01-23 18:15:28 +01:00
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}
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}
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2020-01-23 23:04:36 +01:00
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static void
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init_mmap(int fd)
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{
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struct v4l2_requestbuffers req = { 0 };
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2020-01-23 18:15:28 +01:00
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req.count = 4;
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req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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req.memory = V4L2_MEMORY_MMAP;
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2020-01-23 23:04:36 +01:00
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if (xioctl(fd, VIDIOC_REQBUFS, &req) == -1) {
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if (errno == EINVAL) {
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fprintf(stderr, "%s does not support memory mapping",
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dev_name);
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2020-01-23 18:15:28 +01:00
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exit(EXIT_FAILURE);
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} else {
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errno_exit("VIDIOC_REQBUFS");
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}
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}
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if (req.count < 2) {
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2020-01-23 23:04:36 +01:00
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fprintf(stderr, "Insufficient buffer memory on %s\n",
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2020-01-23 18:15:28 +01:00
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dev_name);
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exit(EXIT_FAILURE);
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}
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2020-01-23 23:04:36 +01:00
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buffers = calloc(req.count, sizeof(buffers[0]));
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2020-01-23 18:15:28 +01:00
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if (!buffers) {
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fprintf(stderr, "Out of memory\\n");
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exit(EXIT_FAILURE);
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}
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for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
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2020-01-23 23:04:36 +01:00
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struct v4l2_buffer buf = {
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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.memory = V4L2_MEMORY_MMAP,
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.index = n_buffers,
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};
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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if (xioctl(fd, VIDIOC_QUERYBUF, &buf) == -1) {
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2020-01-23 18:15:28 +01:00
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errno_exit("VIDIOC_QUERYBUF");
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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buffers[n_buffers].length = buf.length;
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2020-01-23 23:04:36 +01:00
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buffers[n_buffers].start = mmap(NULL /* start anywhere */,
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buf.length,
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PROT_READ | PROT_WRITE /* required */,
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MAP_SHARED /* recommended */,
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fd, buf.m.offset);
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if (MAP_FAILED == buffers[n_buffers].start) {
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2020-01-23 18:15:28 +01:00
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errno_exit("mmap");
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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}
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}
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2020-01-23 23:04:36 +01:00
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static void
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init_device(int fd)
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{
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2020-01-23 18:15:28 +01:00
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struct v4l2_capability cap;
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2020-01-23 23:04:36 +01:00
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if (xioctl(fd, VIDIOC_QUERYCAP, &cap) == -1) {
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if (errno == EINVAL) {
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fprintf(stderr, "%s is no V4L2 device\n",
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2020-01-23 18:15:28 +01:00
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dev_name);
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exit(EXIT_FAILURE);
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} else {
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errno_exit("VIDIOC_QUERYCAP");
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}
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}
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if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
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2020-01-23 23:04:36 +01:00
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fprintf(stderr, "%s is no video capture device\n",
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2020-01-23 18:15:28 +01:00
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dev_name);
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exit(EXIT_FAILURE);
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}
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switch (io) {
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2020-01-23 23:04:36 +01:00
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case IO_METHOD_READ:
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if (!(cap.capabilities & V4L2_CAP_READWRITE)) {
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fprintf(stderr, "%s does not support read i/o\n",
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dev_name);
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exit(EXIT_FAILURE);
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}
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break;
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case IO_METHOD_MMAP:
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case IO_METHOD_USERPTR:
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if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
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fprintf(stderr, "%s does not support streaming i/o\n",
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dev_name);
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exit(EXIT_FAILURE);
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}
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break;
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2020-01-23 18:15:28 +01:00
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}
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/* Select video input, video standard and tune here. */
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2020-01-23 23:04:36 +01:00
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struct v4l2_cropcap cropcap = {
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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};
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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struct v4l2_crop crop = { 0 };
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if (xioctl(fd, VIDIOC_CROPCAP, &cropcap) == 0) {
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2020-01-23 18:15:28 +01:00
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crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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crop.c = cropcap.defrect; /* reset to default */
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2020-01-23 23:04:36 +01:00
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if (xioctl(fd, VIDIOC_S_CROP, &crop) == -1) {
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2020-01-23 18:15:28 +01:00
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switch (errno) {
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2020-01-23 23:04:36 +01:00
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case EINVAL:
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/* Cropping not supported. */
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break;
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default:
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/* Errors ignored. */
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break;
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2020-01-23 18:15:28 +01:00
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}
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}
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} else {
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/* Errors ignored. */
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}
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2020-01-23 23:04:36 +01:00
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struct v4l2_format fmt = {
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
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};
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if (preview_width > 0) {
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fmt.fmt.pix.width = preview_width;
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fmt.fmt.pix.height = preview_height;
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fmt.fmt.pix.pixelformat = preview_fmt;
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2020-01-23 18:15:28 +01:00
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fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
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2020-01-23 23:04:36 +01:00
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if (xioctl(fd, VIDIOC_S_FMT, &fmt) == -1) {
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2020-01-23 18:15:28 +01:00
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errno_exit("VIDIOC_S_FMT");
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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/* Note VIDIOC_S_FMT may change width and height. */
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} else {
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/* Preserve original settings as set by v4l2-ctl for example */
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2020-01-23 23:04:36 +01:00
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if (xioctl(fd, VIDIOC_G_FMT, &fmt) == -1) {
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2020-01-23 18:15:28 +01:00
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errno_exit("VIDIOC_G_FMT");
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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}
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/* Buggy driver paranoia. */
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2020-01-23 23:04:36 +01:00
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unsigned int min = fmt.fmt.pix.width * 2;
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if (fmt.fmt.pix.bytesperline < min) {
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2020-01-23 18:15:28 +01:00
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fmt.fmt.pix.bytesperline = min;
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
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2020-01-23 23:04:36 +01:00
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if (fmt.fmt.pix.sizeimage < min) {
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2020-01-23 18:15:28 +01:00
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fmt.fmt.pix.sizeimage = min;
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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switch (io) {
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2020-01-23 23:04:36 +01:00
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case IO_METHOD_READ:
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//init_read(fmt.fmt.pix.sizeimage);
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break;
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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case IO_METHOD_MMAP:
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init_mmap(fd);
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break;
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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case IO_METHOD_USERPTR:
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//init_userp(fmt.fmt.pix.sizeimage);
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break;
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2020-01-23 18:15:28 +01:00
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}
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}
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2020-01-23 23:04:36 +01:00
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static void
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process_image(const void *p, int size)
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{
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GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data(p, GDK_COLORSPACE_RGB,
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FALSE, 8, 640, 480, 2 * 640, NULL, NULL);
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2020-01-23 18:15:28 +01:00
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gtk_image_set_from_pixbuf(preview_image, pixbuf);
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}
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2020-01-23 23:04:36 +01:00
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static int
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read_frame(int fd)
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{
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struct v4l2_buffer buf = { 0 };
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2020-01-23 18:15:28 +01:00
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switch (io) {
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2020-01-23 23:04:36 +01:00
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case IO_METHOD_READ:
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if (read(fd, buffers[0].start, buffers[0].length) == -1) {
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switch (errno) {
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case EAGAIN:
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return 0;
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case EIO:
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/* Could ignore EIO, see spec. */
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/* fallthrough */
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default:
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errno_exit("read");
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break;
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2020-01-23 18:15:28 +01:00
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}
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2020-01-23 23:04:36 +01:00
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}
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process_image(buffers[0].start, buffers[0].length);
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break;
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case IO_METHOD_MMAP:
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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buf.memory = V4L2_MEMORY_MMAP;
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if (xioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
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switch (errno) {
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case EAGAIN:
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return 0;
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case EIO:
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/* Could ignore EIO, see spec. */
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/* fallthrough */
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default:
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errno_exit("VIDIOC_DQBUF");
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break;
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2020-01-23 18:15:28 +01:00
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}
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2020-01-23 23:04:36 +01:00
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}
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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//assert(buf.index < n_buffers);
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
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process_image(buffers[buf.index].start, buf.bytesused);
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2020-01-23 18:15:28 +01:00
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2020-01-23 23:04:36 +01:00
|
|
|
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
|
|
|
|
errno_exit("VIDIOC_QBUF");
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case IO_METHOD_USERPTR:
|
|
|
|
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
|
|
buf.memory = V4L2_MEMORY_USERPTR;
|
|
|
|
if (xioctl(fd, VIDIOC_DQBUF, &buf) == -1) {
|
|
|
|
switch (errno) {
|
|
|
|
case EAGAIN:
|
|
|
|
return 0;
|
|
|
|
case EIO:
|
|
|
|
/* Could ignore EIO, see spec. */
|
|
|
|
/* fallthrough */
|
|
|
|
default:
|
|
|
|
errno_exit("VIDIOC_DQBUF");
|
|
|
|
break;
|
2020-01-23 18:15:28 +01:00
|
|
|
}
|
2020-01-23 23:04:36 +01:00
|
|
|
}
|
|
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < n_buffers; ++i) {
|
|
|
|
if (buf.m.userptr == (unsigned long)buffers[i].start
|
|
|
|
&& buf.length == buffers[i].length) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2020-01-23 18:15:28 +01:00
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
//assert(i < n_buffers);
|
2020-01-23 18:15:28 +01:00
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
process_image((void *)buf.m.userptr, buf.bytesused);
|
|
|
|
if (xioctl(fd, VIDIOC_QBUF, &buf) == -1) {
|
|
|
|
errno_exit("VIDIOC_QBUF");
|
|
|
|
}
|
|
|
|
break;
|
2020-01-23 18:15:28 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
static void
|
|
|
|
get_frame(int fd)
|
|
|
|
{
|
|
|
|
while (1) {
|
2020-01-23 18:15:28 +01:00
|
|
|
fd_set fds;
|
|
|
|
struct timeval tv;
|
|
|
|
int r;
|
|
|
|
|
|
|
|
FD_ZERO(&fds);
|
|
|
|
FD_SET(fd, &fds);
|
|
|
|
|
|
|
|
/* Timeout. */
|
|
|
|
tv.tv_sec = 2;
|
|
|
|
tv.tv_usec = 0;
|
|
|
|
|
|
|
|
r = select(fd + 1, &fds, NULL, NULL, &tv);
|
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
if (r == -1) {
|
|
|
|
if (EINTR == errno) {
|
2020-01-23 18:15:28 +01:00
|
|
|
continue;
|
2020-01-23 23:04:36 +01:00
|
|
|
}
|
2020-01-23 18:15:28 +01:00
|
|
|
errno_exit("select");
|
2020-01-23 23:04:36 +01:00
|
|
|
} else if (r == 0) {
|
2020-01-23 18:15:28 +01:00
|
|
|
fprintf(stderr, "select timeout\\n");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
if (read_frame(fd)) {
|
2020-01-23 18:15:28 +01:00
|
|
|
break;
|
2020-01-23 23:04:36 +01:00
|
|
|
}
|
2020-01-23 18:15:28 +01:00
|
|
|
/* EAGAIN - continue select loop. */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
static int
|
|
|
|
config_ini_handler(void *user, const char *section, const char *name,
|
|
|
|
const char *value) {
|
|
|
|
if (strcmp(section, "preview") == 0) {
|
|
|
|
if (strcmp(name, "width") == 0) {
|
|
|
|
preview_width = strtol(value, NULL, 10);
|
|
|
|
} else if (strcmp(name, "height") == 0) {
|
|
|
|
preview_height = strtol(value, NULL, 10);
|
|
|
|
} else if (strcmp(name, "fmt") == 0) {
|
2020-01-24 00:56:52 +01:00
|
|
|
if (strcmp(value, "RGB") == 0){
|
|
|
|
preview_fmt = V4L2_PIX_FMT_RGB24;
|
|
|
|
} else if (strcmp(value, "UYVY8") == 0) {
|
|
|
|
preview_fmt = V4L2_PIX_FMT_UYVY;
|
|
|
|
} else if (strcmp(value, "JPEG") == 0) {
|
|
|
|
preview_fmt = V4L2_PIX_FMT_JPEG;
|
|
|
|
} else if (strcmp(value, "NV12") == 0) {
|
|
|
|
preview_fmt = V4L2_PIX_FMT_NV12;
|
|
|
|
} else {
|
|
|
|
g_printerr("Unsupported pixelformat %s\n", value);
|
|
|
|
exit(1);
|
|
|
|
}
|
2020-01-23 23:04:36 +01:00
|
|
|
preview_fmt = strtol(value, NULL, 10);
|
|
|
|
} else {
|
2020-01-24 00:56:52 +01:00
|
|
|
g_printerr("Unknown key '%s' in [preview]\n", name);
|
2020-01-23 23:04:36 +01:00
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
} else if (strcmp(section, "device") == 0) {
|
|
|
|
if (strcmp(name, "rear") == 0) {
|
|
|
|
rear_dev_name = strdup(value);
|
|
|
|
} else if (strcmp(name, "front") == 0) {
|
|
|
|
front_dev_name = strdup(value);
|
|
|
|
} else {
|
2020-01-24 00:56:52 +01:00
|
|
|
g_printerr("Unknown key '%s' in [device]\n", name);
|
2020-01-23 23:04:36 +01:00
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
} else {
|
2020-01-24 00:56:52 +01:00
|
|
|
g_printerr("Unknown section '%s' in config file\n", section);
|
2020-01-23 23:04:36 +01:00
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
2020-01-23 18:15:28 +01:00
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
int
|
|
|
|
main(int argc, char *argv[])
|
|
|
|
{
|
|
|
|
if (argc != 2) {
|
|
|
|
g_printerr("Usage: camera configfile\n");
|
|
|
|
return 1;
|
|
|
|
}
|
2020-01-23 18:15:28 +01:00
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
GError *error = NULL;
|
|
|
|
gtk_init(&argc, &argv);
|
|
|
|
GtkBuilder *builder = gtk_builder_new();
|
2020-01-23 18:15:28 +01:00
|
|
|
if (gtk_builder_add_from_file(builder, "camera.glade", &error) == 0) {
|
|
|
|
g_printerr("Error loading file: %s\n", error->message);
|
|
|
|
g_clear_error(&error);
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
GObject *window = gtk_builder_get_object(builder, "window");
|
|
|
|
GObject *preview_box = gtk_builder_get_object(builder, "preview_box");
|
2020-01-23 18:15:28 +01:00
|
|
|
preview_image = gtk_builder_get_object(builder, "preview");
|
2020-01-23 23:04:36 +01:00
|
|
|
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
|
2020-01-23 18:15:28 +01:00
|
|
|
|
|
|
|
GtkCssProvider *provider = gtk_css_provider_new();
|
|
|
|
gtk_css_provider_load_from_path(provider, "camera.css", NULL);
|
2020-01-23 23:04:36 +01:00
|
|
|
GtkStyleContext *context = gtk_widget_get_style_context(preview_box);
|
|
|
|
gtk_style_context_add_provider(context,
|
|
|
|
GTK_STYLE_PROVIDER(provider),
|
|
|
|
GTK_STYLE_PROVIDER_PRIORITY_USER);
|
|
|
|
|
|
|
|
int result = ini_parse(argv[1], config_ini_handler, NULL);
|
|
|
|
if (result == -1) {
|
|
|
|
g_printerr("Config file not found\n");
|
|
|
|
return 1;
|
|
|
|
} else if (result == -2) {
|
|
|
|
g_printerr("Could not allocate memory to parse config file\n");
|
|
|
|
return 1;
|
|
|
|
} else if (result != 0) {
|
|
|
|
g_printerr("Could not parse config file\n");
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev_name = rear_dev_name;
|
2020-01-23 18:15:28 +01:00
|
|
|
|
2020-01-23 23:04:36 +01:00
|
|
|
int fd = open(dev_name, O_RDWR);
|
2020-01-23 18:15:28 +01:00
|
|
|
if (fd == -1) {
|
2020-01-23 23:04:36 +01:00
|
|
|
g_printerr("Error opening video device: %s\n", dev_name);
|
2020-01-23 18:15:28 +01:00
|
|
|
return 1;
|
|
|
|
}
|
2020-01-23 23:04:36 +01:00
|
|
|
|
2020-01-23 18:15:28 +01:00
|
|
|
init_device(fd);
|
|
|
|
start_capturing(fd);
|
|
|
|
get_frame(fd);
|
|
|
|
|
|
|
|
gtk_widget_show(window);
|
|
|
|
gtk_main();
|
|
|
|
return 0;
|
2020-01-23 23:04:36 +01:00
|
|
|
}
|