Add v4l-utils to chromium third_party

third_party/v4l-utils/lib/include/libv4l2.h

+/*
+#             (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., 51 Franklin Street, Suite 500, Boston, MA  02110-1335  USA
+*/
+
+#ifndef __LIBV4L2_H
+#define __LIBV4L2_H
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#if HAVE_VISIBILITY
+#define LIBV4L_PUBLIC __attribute__ ((visibility("default")))
+#else
+#define LIBV4L_PUBLIC
+#endif
+
+/* Point this to a FILE opened for writing when you want to log error and
+   status messages to a file, when NULL errors will get send to stderr */
+LIBV4L_PUBLIC extern FILE *v4l2_log_file;
+
+/* Just like your regular open/close/etc, except that format conversion is
+   done if necessary when capturing. That is if you (try to) set a capture
+   format which is not supported by the cam, but is supported by libv4lconvert,
+   then the try_fmt / set_fmt will succeed as if the cam supports the format
+   and on dqbuf / read the data will be converted for you and returned in
+   the request format. enum_fmt will also report support for the formats to
+   which conversion is possible.
+
+   Another difference is that you can make v4l2_read() calls even on devices
+   which do not support the regular read() method.
+
+   Note the device name passed to v4l2_open must be of a video4linux2 device,
+   if it is anything else (including a video4linux1 device), v4l2_open will
+   fail.
+
+   Note that the argument to v4l2_ioctl after the request must be a valid
+   memory address of structure of the appropriate type for the request (for
+   v4l2 requests which expect a structure address). Passing in NULL or an
+   invalid memory address will not lead to failure with errno being EFAULT,
+   as it would with a real ioctl, but will cause libv4l2 to break, and you
+   get to keep both pieces.
+*/
+
+LIBV4L_PUBLIC int v4l2_open(const char *file, int oflag, ...);
+LIBV4L_PUBLIC int v4l2_close(int fd);
+LIBV4L_PUBLIC int v4l2_dup(int fd);
+LIBV4L_PUBLIC int v4l2_ioctl(int fd, unsigned long int request, ...);
+LIBV4L_PUBLIC ssize_t v4l2_read(int fd, void *buffer, size_t n);
+LIBV4L_PUBLIC ssize_t v4l2_write(int fd, const void *buffer, size_t n);
+LIBV4L_PUBLIC void *v4l2_mmap(void *start, size_t length, int prot, int flags,
+                int fd, int64_t offset);
+LIBV4L_PUBLIC int v4l2_munmap(void *_start, size_t length);
+
+
+/* Misc utility functions */
+
+/* This function takes a value of 0 - 65535, and then scales that range to
+   the actual range of the given v4l control id, and then if the cid exists
+   and is not locked sets the cid to the scaled value.
+
+   Normally returns 0, even if the cid did not exist or was locked, returns
+   non 0 when an other error occured. */
+LIBV4L_PUBLIC int v4l2_set_control(int fd, int cid, int value);
+
+/* This function returns a value of 0 - 65535, scaled to from the actual range
+   of the given v4l control id. When the cid does not exist, or could not be
+   accessed -1 is returned. */
+LIBV4L_PUBLIC int v4l2_get_control(int fd, int cid);
+
+
+/* "low level" access functions, these functions allow somewhat lower level
+   access to libv4l2 (currently there only is v4l2_fd_open here) */
+
+/* Flags for v4l2_fd_open's v4l2_flags argument */
+
+/* Disable all format conversion done by libv4l2, this includes the software
+   whitebalance, gamma correction, flipping, etc. libv4lconvert does. Use this
+   if you want raw frame data, but still want the additional error checks and
+   the read() emulation libv4l2 offers. */
+#define V4L2_DISABLE_CONVERSION 0x01
+/* This flag is *OBSOLETE*, since version 0.5.98 libv4l *always* reports
+   emulated formats to ENUM_FMT, except when conversion is disabled. */
+#define V4L2_ENABLE_ENUM_FMT_EMULATION 0x02
+
+/* v4l2_fd_open: open an already opened fd for further use through
+   v4l2lib and possibly modify libv4l2's default behavior through the
+   v4l2_flags argument.
+
+   Returns fd on success, -1 if the fd is not suitable for use through libv4l2
+   (note the fd is left open in this case). */
+LIBV4L_PUBLIC int v4l2_fd_open(int fd, int v4l2_flags);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif