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/*****************************************************************************
* lib.c : libv4l2 run-time
*****************************************************************************
* Copyright (C) 2012 Rémi Denis-Courmont
*
* 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <pthread.h>
#include <dlfcn.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <vlc_common.h>
#include "v4l2.h"
static void *v4l2_handle = NULL;
static int (*v4l2_fd_open_) (int, int);
int (*v4l2_close) (int);
int (*v4l2_ioctl) (int, unsigned long int, ...);
ssize_t (*v4l2_read) (int, void *, size_t);
void * (*v4l2_mmap) (void *, size_t, int, int, int, int64_t);
int (*v4l2_munmap) (void *, size_t);
static int fd_open (int fd, int flags)
{
(void) flags;
return fd;
}
static void v4l2_lib_load (void)
{
void *h;
h = dlopen ("libmediaclient.so", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
if (h == NULL)
h = dlopen ("libv4l2.so.0", RTLD_LAZY | RTLD_LOCAL);
if (h == NULL)
goto fallback;
v4l2_fd_open_ = dlsym (h, "v4l2_fd_open");
v4l2_close = dlsym (h, "v4l2_close");
v4l2_ioctl = dlsym (h, "v4l2_ioctl");
v4l2_read = dlsym (h, "v4l2_read");
v4l2_mmap = dlsym (h, "v4l2_mmap");
v4l2_munmap = dlsym (h, "v4l2_munmap");
if (v4l2_fd_open_ != NULL && v4l2_close != NULL && v4l2_ioctl != NULL
&& v4l2_read != NULL && v4l2_mmap != NULL && v4l2_munmap != NULL)
{
v4l2_handle = h;
return;
}
dlclose (h);
fallback:
v4l2_fd_open_ = fd_open;
v4l2_close = close;
v4l2_ioctl = ioctl;
v4l2_read = read;
v4l2_mmap = mmap;
v4l2_munmap = munmap;
}
__attribute__((destructor))
static void v4l2_lib_unload (void)
{
if (v4l2_handle != NULL)
dlclose (v4l2_handle);
}
int v4l2_fd_open (int fd, int flags)
{
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once (&once, v4l2_lib_load);
return v4l2_fd_open_ (fd, flags);
}
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