src/libcamera/formats.cpp


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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * formats.cpp - Libcamera image formats
 */

#include "formats.h"

#include <errno.h>

/**
 * \file formats.h
 * \brief Types and helper methods to handle libcamera image formats
 */

namespace libcamera {

/**
 * \class ImageFormats
 * \brief Describe V4L2Device and V4L2SubDevice image formats
 *
 * This class stores a list of image formats, each associated with a
 * corresponding set of image sizes. It is used to describe the formats and
 * sizes supported by a V4L2Device or V4L2Subdevice.
 *
 * Formats are stored as an integer. When used for a V4L2Device, the image
 * formats are fourcc pixel formats. When used for a V4L2Subdevice they are
 * media bus codes. Both are defined by the V4L2 specification.
 *
 * Sizes are stored as a list of SizeRange.
 */

/**
 * \brief Add a format and corresponding sizes to the description
 * \param[in] format Pixel format or media bus code to describe
 * \param[in] sizes List of supported size ranges for the format
 *
 * \return 0 on success or a negative error code otherwise
 * \retval -EEXIST The format is already described
 */
int ImageFormats::addFormat(unsigned int format, const std::vector<SizeRange> &sizes)
{
	if (data_.find(format) != data_.end())
		return -EEXIST;

	data_[format] = sizes;

	return 0;
}

/**
 * \brief Check if the list of devices supported formats is empty