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96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*****************************************************************************
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* lib.c : libv4l2 run-time
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*****************************************************************************
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* Copyright (C) 2012 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <dlfcn.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <vlc_common.h>
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#include "v4l2.h"
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#ifdef __OpenBSD__
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#define V4L2_LIB "libv4l2.so"
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#else
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#define V4L2_LIB "libv4l2.so.0"
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#endif
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static int fd_open (int fd, int flags)
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{
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(void) flags;
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return fd;
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}
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static void *v4l2_handle = NULL;
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static int (*v4l2_fd_open_cb)(int, int) = fd_open;
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//int (*v4l2_open) (const char *, int, ...) = open;
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//int (*v4l2_dup) (const char *, int, ...) = dup;
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int (*v4l2_close) (int) = close;
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int (*v4l2_ioctl) (int, unsigned long int, ...) = ioctl;
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ssize_t (*v4l2_read) (int, void *, size_t) = read;
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//ssize_t (*v4l2_write) (int, const void *, size_t) = write;
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void * (*v4l2_mmap) (void *, size_t, int, int, int, int64_t) = mmap;
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int (*v4l2_munmap) (void *, size_t) = munmap;
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static void v4l2_lib_load (void)
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{
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void *h;
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h = dlopen ("libmediaclient.so", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (h == NULL)
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h = dlopen (V4L2_LIB, RTLD_LAZY | RTLD_LOCAL);
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if (h == NULL)
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return;
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void *sym = dlsym(h, "v4l2_fd_open");
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if (sym != NULL)
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v4l2_fd_open_cb = sym;
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#define SYM(name) \
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sym = dlsym (h, "v4l2_"#name); \
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if (sym != NULL) v4l2_##name = sym
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/*SYM(open); SYM(dup);*/ SYM(close); SYM(ioctl);
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SYM(read); /*SYM(write);*/ SYM(mmap); SYM(munmap);
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v4l2_handle = h;
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}
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__attribute__((destructor))
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static void v4l2_lib_unload (void)
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{
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if (v4l2_handle != NULL)
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dlclose (v4l2_handle);
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}
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int v4l2_fd_open(int fd, int flags)
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{
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static pthread_once_t once = PTHREAD_ONCE_INIT;
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pthread_once(&once, v4l2_lib_load);
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return v4l2_fd_open_cb(fd, flags);
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}
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