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/*
* Copyright 1994-2019 Olivier Girondel
*
* This file is part of lebiniou.
*
* lebiniou 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, either version 2 of the License, or
* (at your option) any later version.
*
* lebiniou 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.
*
* You should have received a copy of the GNU General Public License
* along with lebiniou. If not, see <http://www.gnu.org/licenses/>.
*/
#include "webcam.h"
extern char *video_base;
int
xioctl(int fd, int request, void *arg)
{
int r;
do
r = ioctl(fd, request, arg);
while ((-1 == r) && (EINTR == errno));
return r;
}
void
init_read(unsigned int buffer_size, webcam_t *cam)
{
cam->buffers = xmalloc(sizeof(buffer_t));
cam->buffers[0].length = buffer_size;
cam->buffers[0].start = xmalloc(buffer_size);
}
void
init_mmap(webcam_t *cam)
{
struct v4l2_requestbuffers req;
CLEAR(req);
req.count = WEBCAM_MMAP;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (-1 == xioctl(cam->fd, VIDIOC_REQBUFS, &req)) {
if (EINVAL == errno)
xerror("%s%d does not support memory mapping\n", video_base, cam->cam_no);
else
xperror("VIDIOC_REQBUFS");
}
if (req.count < 2)
xerror("Insufficient buffer memory on %s%d\n", video_base, cam->cam_no);
cam->buffers = xmalloc(req.count*sizeof(buffer_t));
for (cam->n_buffers = 0; cam->n_buffers < (int)req.count; ++cam->n_buffers) {
struct v4l2_buffer buf;
CLEAR(buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = cam->n_buffers;
if (-1 == xioctl(cam->fd, VIDIOC_QUERYBUF, &buf))
xperror("VIDIOC_QUERYBUF");
cam->buffers[cam->n_buffers].length = buf.length;
cam->buffers[cam->n_buffers].start =
mmap(NULL /* start anywhere */,
buf.length,
PROT_READ | PROT_WRITE /* required */,
MAP_SHARED /* recommended */,
cam->fd, buf.m.offset);
if (MAP_FAILED == cam->buffers[cam->n_buffers].start)
xperror("mmap");
}
}
int
init_device(webcam_t *cam)
{
struct v4l2_capability cap;
struct v4l2_cropcap cropcap;
struct v4l2_crop crop;
struct v4l2_format fmt;
// unsigned int min;
if (-1 == xioctl(cam->fd, VIDIOC_QUERYCAP, &cap)) {
if (EINVAL == errno) {
fprintf(stderr, "[!] %s%d is no V4L2 device\n", video_base, cam->cam_no);
return -1;
} else
xperror("VIDIOC_QUERYCAP");
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
fprintf(stderr, "[!] %s%d is no video capture device\n", video_base, cam->cam_no);
return -1;
}
switch (cam->io) {
case IO_METHOD_READ:
if (!(cap.capabilities & V4L2_CAP_READWRITE)) {
fprintf(stderr, "[!] %s%d does not support read i/o\n", video_base, cam->cam_no);
return -1;
}
break;
case IO_METHOD_MMAP:
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
fprintf(stderr, "[!] %s%d does not support streaming i/o\n", video_base, cam->cam_no);
return -1;
}
break;
}
/* Select video input, video standard and tune here. */
CLEAR(cropcap);
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (0 == xioctl(cam->fd, VIDIOC_CROPCAP, &cropcap)) {
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c.width = CAP_WIDTH;
crop.c.height = CAP_HEIGHT;
crop.c.left = 0;
crop.c.top = 0;
if (-1 == xioctl(cam->fd, VIDIOC_S_CROP, &crop)) {
switch (errno) {
case EINVAL:
/* Cropping not supported. */
break;
default:
/* Errors ignored. */
break;
}
}
} else {
/* Errors ignored. */
}
CLEAR(fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = CAP_WIDTH;
fmt.fmt.pix.height = CAP_HEIGHT;
fmt.fmt.win.w.width = CAP_WIDTH;
fmt.fmt.win.w.height = CAP_HEIGHT;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
/* Note VIDIOC_S_FMT may change width and height. */
if (-1 == xioctl(cam->fd, VIDIOC_S_FMT, &fmt))
return -1;
#if 0
/* Buggy driver paranoia. */
min = fmt.fmt.pix.width * 2;
if (fmt.fmt.pix.bytesperline < min)
fmt.fmt.pix.bytesperline = min;
min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height;
if (fmt.fmt.pix.sizeimage < min)
fmt.fmt.pix.sizeimage = min;
#endif
switch (cam->io) {
case IO_METHOD_READ:
init_read(fmt.fmt.pix.sizeimage, cam);
break;
case IO_METHOD_MMAP:
init_mmap(cam);
break;
}
#ifdef DEBUG
printf("[i] Webcam %d initialized\n", cam->cam_no);
#endif
return 0;
}
void
uninit_device(webcam_t *cam)
{
int i;
switch (cam->io) {
case IO_METHOD_READ:
free(cam->buffers[0].start);
break;
case IO_METHOD_MMAP:
for (i = 0; i < cam->n_buffers; ++i)
if (-1 == munmap(cam->buffers[i].start, cam->buffers[i].length))
xperror("munmap");
break;
}
}
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