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# (C) 2008 Hans de Goede <hdegoede@redhat.com>
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# This program is free software; you can redistribute it and/or modify
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# it 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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# 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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# 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
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifndef __LIBV4LCONVERT_H
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#define __LIBV4LCONVERT_H
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/* These headers are not needed by us, but by linux/videodev2.h,
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which is broken on some systems and doesn't include them itself :( */
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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/* end broken header workaround includes */
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#include <linux/videodev2.h>
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#endif /* __cplusplus */
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#define LIBV4L_PUBLIC __attribute__ ((visibility("default")))
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struct v4lconvert_data;
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LIBV4L_PUBLIC struct v4lconvert_data *v4lconvert_create(int fd);
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LIBV4L_PUBLIC void v4lconvert_destroy(struct v4lconvert_data *data);
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/* When doing flipping / rotating / video-processing, only supported
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destination formats can be used (as flipping / rotating / video-processing
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is not supported on other formats). This function can be used to query
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if that is the case. */
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LIBV4L_PUBLIC int v4lconvert_supported_dst_fmt_only(
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struct v4lconvert_data *data);
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/* With regards to dest_fmt just like VIDIOC_TRY_FMT, except that the try
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format will succeed and return the requested V4L2_PIX_FMT_foo in dest_fmt if
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the cam has a format from which v4lconvert can convert to dest_fmt.
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The real format to which the cam should be set is returned through src_fmt
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Note that just like the real VIDIOC_TRY_FMT this function will change the
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dest_fmt when not supported. This includes changing it to a supported
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destination format when trying a native format of the camera and
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v4lconvert_supported_dst_fmt_only() returns true. */
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LIBV4L_PUBLIC int v4lconvert_try_format(struct v4lconvert_data *data,
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struct v4l2_format *dest_fmt, /* in / out */
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struct v4l2_format *src_fmt /* out */
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/* Like VIDIOC_ENUM_FMT, but the emulated formats are added at the end of the
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list, except if flipping / processing is active for the device, then only
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supported destination formats are listed */
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LIBV4L_PUBLIC int v4lconvert_enum_fmt(struct v4lconvert_data *data, struct v4l2_fmtdesc *fmt);
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/* Is conversion necessary or can the app use the data directly? */
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LIBV4L_PUBLIC int v4lconvert_needs_conversion(struct v4lconvert_data *data,
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const struct v4l2_format *src_fmt, /* in */
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const struct v4l2_format *dest_fmt); /* in */
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/* return value of -1 on error, otherwise the amount of bytes written to
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LIBV4L_PUBLIC int v4lconvert_convert(struct v4lconvert_data *data,
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const struct v4l2_format *src_fmt, /* in */
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const struct v4l2_format *dest_fmt, /* in */
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unsigned char *src, int src_size, unsigned char *dest, int dest_size);
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/* get a string describing the last error*/
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LIBV4L_PUBLIC const char *v4lconvert_get_error_message(struct v4lconvert_data *data);
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/* Just like VIDIOC_ENUM_FRAMESIZE, except that the framesizes of emulated
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formats can be enumerated as well. */
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LIBV4L_PUBLIC int v4lconvert_enum_framesizes(struct v4lconvert_data *data,
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struct v4l2_frmsizeenum *frmsize);
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/* Just like VIDIOC_ENUM_FRAMEINTERVALS, except that the intervals of emulated
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formats can be enumerated as well. */
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LIBV4L_PUBLIC int v4lconvert_enum_frameintervals(struct v4lconvert_data *data,
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struct v4l2_frmivalenum *frmival);
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/* Pass calls to query, get and set video controls to the libv4lcontrol class */
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LIBV4L_PUBLIC int v4lconvert_vidioc_queryctrl(struct v4lconvert_data *data,
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LIBV4L_PUBLIC int v4lconvert_vidioc_g_ctrl(struct v4lconvert_data *data,
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LIBV4L_PUBLIC int v4lconvert_vidioc_s_ctrl(struct v4lconvert_data *data,
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/* Is the passed in pixelformat supported as destination format ? */
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LIBV4L_PUBLIC int v4lconvert_supported_dst_format(unsigned int pixelformat);
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#endif /* __cplusplus */
added
removed
lib/include/libv4lconvert.h
