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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"
/**
* \file formats.h
* \brief Types and helper methods to handle libcamera image formats
*/
namespace libcamera {
/**
* \typedef FormatEnum
* \brief Type definition for the map of image formats and sizes
*
* Type definition used to enumerate the supported pixel formats and image
* frame sizes. The type associates in a map a pixel format (for memory
* formats) or a media bus code (for bus formats), to a vector of image
* resolutions represented by SizeRange items.
*/
/**
* \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
* \return True if the list of supported formats is empty
*/
bool ImageFormats::isEmpty() const
{
return data_.empty();
}
/**
* \brief Retrieve a list of all supported image formats
* \return List of pixel formats or media bus codes
*/
std::vector<unsigned int> ImageFormats::formats() const
{
std::vector<unsigned int> formats;
formats.reserve(data_.size());
/* \todo: Should this be cached instead of computed each time? */
for (auto const &it : data_)
formats.push_back(it.first);
return formats;
}
/**
* \brief Retrieve all sizes for a specific format
* \param[in] format The pixel format or mbus code
*
* Retrieve all size ranges for a specific format. For V4L2Device \a format is a
* pixel format while for a V4L2Subdevice \a format is a media bus code.
*
* \return The list of image sizes supported for \a format, or an empty list if
* the format is not supported
*/
const std::vector<SizeRange> &ImageFormats::sizes(unsigned int format) const
{
static std::vector<SizeRange> empty;
auto const &it = data_.find(format);
if (it == data_.end())
return empty;
return it->second;
}
/**
* \brief Retrieve the map that associates formats to image sizes
* \return The map that associates formats to image sizes
*/
const std::map<unsigned int, std::vector<SizeRange>> &ImageFormats::data() const
{
return data_;
}
} /* namespace libcamera */
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