/usr/include/libv4lconvert.h is in libv4l-dev 0.8.6-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# (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 __LIBV4LCONVERT_H
#define __LIBV4LCONVERT_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 :( */
#ifdef linux
#include <sys/time.h>
#include <linux/types.h>
#include <linux/ioctl.h>
#endif
#ifdef __FreeBSD__
#include <sys/time.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#endif
/* end broken header workaround includes */
#include <linux/videodev2.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#if __GNUC__ >= 4
#define LIBV4L_PUBLIC __attribute__ ((visibility("default")))
#else
#define LIBV4L_PUBLIC
#endif
struct v4lconvert_data;
LIBV4L_PUBLIC struct v4lconvert_data *v4lconvert_create(int fd);
LIBV4L_PUBLIC void v4lconvert_destroy(struct v4lconvert_data *data);
/* When doing flipping / rotating / video-processing, only supported
destination formats can be used (as flipping / rotating / video-processing
is not supported on other formats). This function can be used to query
if that is the case. */
LIBV4L_PUBLIC int v4lconvert_supported_dst_fmt_only(
struct v4lconvert_data *data);
/* With regards to dest_fmt just like VIDIOC_TRY_FMT, except that the try
format will succeed and return the requested V4L2_PIX_FMT_foo in dest_fmt if
the cam has a format from which v4lconvert can convert to dest_fmt.
The real format to which the cam should be set is returned through src_fmt
when not NULL.
Note that just like the real VIDIOC_TRY_FMT this function will change the
dest_fmt when not supported. This includes changing it to a supported
destination format when trying a native format of the camera and
v4lconvert_supported_dst_fmt_only() returns true. */
LIBV4L_PUBLIC int v4lconvert_try_format(struct v4lconvert_data *data,
struct v4l2_format *dest_fmt, /* in / out */
struct v4l2_format *src_fmt); /* out */
/* Like VIDIOC_ENUM_FMT, but the emulated formats are added at the end of the
list, except if flipping / processing is active for the device, then only
supported destination formats are listed */
LIBV4L_PUBLIC int v4lconvert_enum_fmt(struct v4lconvert_data *data,
struct v4l2_fmtdesc *fmt);
/* Is conversion necessary or can the app use the data directly? */
LIBV4L_PUBLIC int v4lconvert_needs_conversion(struct v4lconvert_data *data,
const struct v4l2_format *src_fmt, /* in */
const struct v4l2_format *dest_fmt); /* in */
/* return value of -1 on error, otherwise the amount of bytes written to
dest */
LIBV4L_PUBLIC int v4lconvert_convert(struct v4lconvert_data *data,
const struct v4l2_format *src_fmt, /* in */
const struct v4l2_format *dest_fmt, /* in */
unsigned char *src, int src_size, unsigned char *dest, int dest_size);
/* get a string describing the last error */
LIBV4L_PUBLIC const char *v4lconvert_get_error_message(struct v4lconvert_data *data);
/* Just like VIDIOC_ENUM_FRAMESIZE, except that the framesizes of emulated
formats can be enumerated as well. */
LIBV4L_PUBLIC int v4lconvert_enum_framesizes(struct v4lconvert_data *data,
struct v4l2_frmsizeenum *frmsize);
/* Just like VIDIOC_ENUM_FRAMEINTERVALS, except that the intervals of emulated
formats can be enumerated as well. */
LIBV4L_PUBLIC int v4lconvert_enum_frameintervals(struct v4lconvert_data *data,
struct v4l2_frmivalenum *frmival);
/* Pass calls to query, get and set video controls to the libv4lcontrol class */
LIBV4L_PUBLIC int v4lconvert_vidioc_queryctrl(struct v4lconvert_data *data,
void *arg);
LIBV4L_PUBLIC int v4lconvert_vidioc_g_ctrl(struct v4lconvert_data *data,
void *arg);
LIBV4L_PUBLIC int v4lconvert_vidioc_s_ctrl(struct v4lconvert_data *data,
void *arg);
/* Is the passed in pixelformat supported as destination format? */
LIBV4L_PUBLIC int v4lconvert_supported_dst_format(unsigned int pixelformat);
/* Get/set the no fps libv4lconvert uses to decide if a compressed format
must be used as src fmt to stay within the bus bandwidth */
LIBV4L_PUBLIC int v4lconvert_get_fps(struct v4lconvert_data *data);
LIBV4L_PUBLIC void v4lconvert_set_fps(struct v4lconvert_data *data, int fps);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif
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