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d42b410e05
This commit moves some of the functionality from avfilter/colorspace into avutil/csp and exposes it as a public API so it can be used by libavcodec and/or libavformat. It also converts those structs from double values to AVRational to make regression testing easier and more consistent. Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/*
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* Copyright (c) 2016 Ronald S. Bultje <rsbultje@gmail.com>
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_CSP_H
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#define AVUTIL_CSP_H
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#include "pixfmt.h"
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#include "rational.h"
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/**
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* @file Colorspace value utility functions for libavutil.
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* @author Ronald S. Bultje <rsbultje@gmail.com>
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* @author Leo Izen <leo.izen@gmail.com>
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* @defgroup lavu_math_csp Colorspace Utility
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* @ingroup lavu_math
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* @{
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*/
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/**
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* Struct containing luma coefficients to be used for RGB to YUV/YCoCg, or similar
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* calculations.
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*/
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typedef struct AVLumaCoefficients {
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AVRational cr, cg, cb;
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} AVLumaCoefficients;
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/**
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* Struct containing chromaticity x and y values for the standard CIE 1931
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* chromaticity definition.
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*/
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typedef struct AVCIExy {
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AVRational x, y;
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} AVCIExy;
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/**
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* Struct defining the red, green, and blue primary locations in terms of CIE
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* 1931 chromaticity x and y.
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*/
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typedef struct AVPrimaryCoefficients {
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AVCIExy r, g, b;
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} AVPrimaryCoefficients;
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/**
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* Struct defining white point location in terms of CIE 1931 chromaticity x
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* and y.
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*/
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typedef AVCIExy AVWhitepointCoefficients;
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/**
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* Struct that contains both white point location and primaries location, providing
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* the complete description of a color gamut.
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*/
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typedef struct AVColorPrimariesDesc {
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AVWhitepointCoefficients wp;
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AVPrimaryCoefficients prim;
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} AVColorPrimariesDesc;
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/**
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* Retrieves the Luma coefficients necessary to construct a conversion matrix
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* from an enum constant describing the colorspace.
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* @param csp An enum constant indicating YUV or similar colorspace.
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* @return The Luma coefficients associated with that colorspace, or NULL
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* if the constant is unknown to libavutil.
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*/
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const AVLumaCoefficients *av_csp_luma_coeffs_from_avcsp(enum AVColorSpace csp);
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/**
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* Retrieves a complete gamut description from an enum constant describing the
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* color primaries.
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* @param prm An enum constant indicating primaries
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* @return A description of the colorspace gamut associated with that enum
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* constant, or NULL if the constant is unknown to libavutil.
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*/
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const AVColorPrimariesDesc *av_csp_primaries_desc_from_id(enum AVColorPrimaries prm);
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/**
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* Detects which enum AVColorPrimaries constant corresponds to the given complete
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* gamut description.
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* @see enum AVColorPrimaries
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* @param prm A description of the colorspace gamut
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* @return The enum constant associated with this gamut, or
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* AVCOL_PRI_UNSPECIFIED if no clear match can be idenitified.
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*/
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enum AVColorPrimaries av_csp_primaries_id_from_desc(const AVColorPrimariesDesc *prm);
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/**
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* @}
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*/
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#endif /* AVUTIL_CSP_H */
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