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/*
# open/close/ioctl/mmap/munmap library call wrapper doing format conversion
# for v4l2 applications which want to be able to simply capture bgr24 / yuv420
# from v4l2 devices with more exotic frame formats.
# (C) 2008 Hans de Goede <hdegoede@redhat.com>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _LARGEFILE64_SOURCE 1
#include <stdarg.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include "../libv4lconvert/libv4lsyscall-priv.h"
#include <linux/videodev2.h>
#include <libv4l2.h>
/* Check that open/read/mmap is not a define */
#if defined open || defined read || defined mmap
#error open/read/mmap is a prepocessor macro !!
#endif
#if __GNUC__ >= 4
#define LIBV4L_PUBLIC __attribute__ ((visibility("default")))
#else
#define LIBV4L_PUBLIC
#endif
LIBV4L_PUBLIC int open (const char *file, int oflag, ...)
{
int fd;
struct v4l2_capability cap;
int v4l_device = 0;
/* check if we're opening a video4linux2 device */
if (!strncmp(file, "/dev/video", 10) || !strncmp(file, "/dev/v4l/", 9)) {
/* Some apps open the device read only, but we need rw rights as the
buffers *MUST* be mapped rw */
oflag = (oflag & ~O_ACCMODE) | O_RDWR;
v4l_device = 1;
}
/* original open code */
if (oflag & O_CREAT)
{
va_list ap;
mode_t mode;
va_start (ap, oflag);
mode = va_arg (ap, mode_t);
fd = SYS_OPEN(file, oflag, mode);
va_end(ap);
} else
fd = SYS_OPEN(file, oflag, 0);
/* end of original open code */
if (fd == -1 || !v4l_device)
return fd;
/* check that this is an v4l2 device, libv4l2 only supports v4l2 devices */
if (SYS_IOCTL(fd, VIDIOC_QUERYCAP, &cap))
return fd;
/* libv4l2 only adds functionality to capture capable devices */
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
return fd;
/* Try to Register with libv4l2 (in case of failure pass the fd to the
application as is) */
v4l2_fd_open(fd, 0);
return fd;
}
#ifdef linux
LIBV4L_PUBLIC int open64(const char *file, int oflag, ...)
{
int fd;
/* original open code */
if (oflag & O_CREAT)
{
va_list ap;
mode_t mode;
va_start (ap, oflag);
mode = va_arg (ap, mode_t);
fd = open(file, oflag | O_LARGEFILE, mode);
va_end(ap);
} else
fd = open(file, oflag | O_LARGEFILE);
/* end of original open code */
return fd;
}
#endif
LIBV4L_PUBLIC int close(int fd)
{
return v4l2_close(fd);
}
LIBV4L_PUBLIC int dup(int fd)
{
return v4l2_dup(fd);
}
LIBV4L_PUBLIC int ioctl (int fd, unsigned long int request, ...)
{
void *arg;
va_list ap;
va_start (ap, request);
arg = va_arg (ap, void *);
va_end (ap);
return v4l2_ioctl (fd, request, arg);
}
LIBV4L_PUBLIC ssize_t read (int fd, void* buffer, size_t n)
{
return v4l2_read (fd, buffer, n);
}
LIBV4L_PUBLIC void *mmap(void *start, size_t length, int prot, int flags, int fd,
__off_t offset)
{
return v4l2_mmap(start, length, prot, flags, fd, offset);
}
#ifdef linux
LIBV4L_PUBLIC void *mmap64(void *start, size_t length, int prot, int flags, int fd,
__off64_t offset)
{
return v4l2_mmap(start, length, prot, flags, fd, offset);
}
#endif
LIBV4L_PUBLIC int munmap(void *start, size_t length)
{
return v4l2_munmap(start, length);
}
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