src/v4l2/libcamerify.in


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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-or-later

help() {
	echo "$0: Load an application with libcamera V4L2 compatibility layer preload"
	echo " $0 [OPTIONS...] executable [args]"
	echo " -d, --debug	Increase log level"
}

debug=0
while [ $# -gt 0 ]; do
	case $1 in
		-d|--debug)
			debug=$((debug+1))
			;;
		-h)
			help;
			exit 0
			;;
		--)
			shift;
			break;;
		-*)
			echo "Unrecognised option: $1";
			help;
			exit 1
			;;
		*)
			break
			;;
	esac
	shift
done

[ $debug -gt 0 ] && loglevel=V4L2Compat:0
[ $debug -gt 1 ] && loglevel=0
[ "$loglevel" != "" ] && export LIBCAMERA_LOG_LEVELS=$loglevel

if [ "$LD_PRELOAD" = "" ] ; then
   LD_PRELOAD='@LIBCAMERA_V4L2_SO@'
else
   LD_PRELOAD="$LD_PRELOAD "'@LIBCAMERA_V4L2_SO@'
fi

export LD_PRELOAD

exec "$@"
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * format_convert.h - qcam - Convert buffer to RGB
 */
#ifndef __QCAM_FORMAT_CONVERTER_H__
#define __QCAM_FORMAT_CONVERTER_H__

#include <stddef.h>

#include <QSize>

#include <libcamera/pixelformats.h>

class QImage;

class FormatConverter
{
public:
	int configure(const libcamera::PixelFormat &format, const QSize &size);

	void convert(const unsigned char *src, size_t size, QImage *dst);

private:
	enum FormatFamily {
		MJPEG,
		NV,
		RGB,
		YUV,
	};

	void convertNV(const unsigned char *src, unsigned char *dst);
	void convertRGB(const unsigned char *src, unsigned char *dst);
	void convertYUV(const unsigned char *src, unsigned char *dst);

	libcamera::PixelFormat format_;
	unsigned int width_;
	unsigned int height_;

	enum FormatFamily formatFamily_;

	/* NV parameters */
	unsigned int horzSubSample_;
	unsigned int vertSubSample_;
	bool nvSwap_;

	/* RGB parameters */
	unsigned int bpp_;
	unsigned int r_pos_;
	unsigned int g_pos_;
	unsigned int b_pos_;

	/* YUV parameters */
	unsigned int y_pos_;
	unsigned int cb_pos_;
};

#endif /* __QCAM_FORMAT_CONVERTER_H__ */