1 files changed, 166 insertions, 0 deletions
diff --git a/v4l2-apps/libv4l/libv4l2/v4l2convert.c b/v4l2-apps/libv4l/libv4l2/v4l2convert.c
new file mode 100644
index 000000000..307a03ce5
--- /dev/null
+++ b/v4l2-apps/libv4l/libv4l2/v4l2convert.c
@@ -0,0 +1,166 @@
+/*
+# 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 <j.w.r.degoede@hhs.nl>
+
+# 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 <syscall.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+/* These headers are not needed by us, but by linux/videodev2.h,
+   which is broken on some systems and doesn't include them itself :( */
+#include <sys/time.h>
+#include <asm/types.h>
+#include <linux/ioctl.h>
+/* end broken header workaround includes */
+#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 = syscall(SYS_open, file, oflag, mode);
+
+    va_end(ap);
+  } else
+    fd = syscall(SYS_open, file, oflag);
+  /* 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 (syscall(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, V4L2_ENABLE_ENUM_FMT_EMULATION);
+
+  return fd;
+}
+
+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;
+}
+
+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);
+}
+
+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);
+}
+
+LIBV4L_PUBLIC int munmap(void *start, size_t length)
+{
+  return v4l2_munmap(start, length);
+}
+