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SMPTE ST 2084 transfer characteristics (a.k.a ITU-R BT.2100-1 perceptual quantization, PQ) is used for various HDR standard. With ST 2084, we can represent BT 2100 (Rec. 2100). BT 2100 defines various aspect of HDR such as resolution, transfer functions, matrix, primaries and etc. It uses BT2020 color space (primaries and matrix) with PQ or HLG transfer functions.
244 lines
9 KiB
C
244 lines
9 KiB
C
/* GStreamer
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* Copyright (C) <2011> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_VIDEO_COLOR_H__
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#define __GST_VIDEO_COLOR_H__
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#include <gst/gst.h>
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#include <gst/video/video-format.h>
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G_BEGIN_DECLS
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/**
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* GstVideoColorRange:
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* @GST_VIDEO_COLOR_RANGE_UNKNOWN: unknown range
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* @GST_VIDEO_COLOR_RANGE_0_255: [0..255] for 8 bit components
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* @GST_VIDEO_COLOR_RANGE_16_235: [16..235] for 8 bit components. Chroma has
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* [16..240] range.
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*
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* Possible color range values. These constants are defined for 8 bit color
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* values and can be scaled for other bit depths.
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*/
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typedef enum {
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GST_VIDEO_COLOR_RANGE_UNKNOWN = 0,
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GST_VIDEO_COLOR_RANGE_0_255,
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GST_VIDEO_COLOR_RANGE_16_235
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} GstVideoColorRange;
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/**
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* GstVideoColorMatrix:
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* @GST_VIDEO_COLOR_MATRIX_UNKNOWN: unknown matrix
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* @GST_VIDEO_COLOR_MATRIX_RGB: identity matrix
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* @GST_VIDEO_COLOR_MATRIX_FCC: FCC color matrix
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* @GST_VIDEO_COLOR_MATRIX_BT709: ITU-R BT.709 color matrix
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* @GST_VIDEO_COLOR_MATRIX_BT601: ITU-R BT.601 color matrix
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* @GST_VIDEO_COLOR_MATRIX_SMPTE240M: SMPTE 240M color matrix
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* @GST_VIDEO_COLOR_MATRIX_BT2020: ITU-R BT.2020 color matrix. Since: 1.6
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*
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* The color matrix is used to convert between Y'PbPr and
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* non-linear RGB (R'G'B')
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*/
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typedef enum {
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GST_VIDEO_COLOR_MATRIX_UNKNOWN = 0,
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GST_VIDEO_COLOR_MATRIX_RGB,
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GST_VIDEO_COLOR_MATRIX_FCC,
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GST_VIDEO_COLOR_MATRIX_BT709,
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GST_VIDEO_COLOR_MATRIX_BT601,
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GST_VIDEO_COLOR_MATRIX_SMPTE240M,
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GST_VIDEO_COLOR_MATRIX_BT2020
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} GstVideoColorMatrix;
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GST_VIDEO_API
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gboolean gst_video_color_matrix_get_Kr_Kb (GstVideoColorMatrix matrix, gdouble * Kr, gdouble * Kb);
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/**
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* GstVideoTransferFunction:
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* @GST_VIDEO_TRANSFER_UNKNOWN: unknown transfer function
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* @GST_VIDEO_TRANSFER_GAMMA10: linear RGB, gamma 1.0 curve
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* @GST_VIDEO_TRANSFER_GAMMA18: Gamma 1.8 curve
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* @GST_VIDEO_TRANSFER_GAMMA20: Gamma 2.0 curve
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* @GST_VIDEO_TRANSFER_GAMMA22: Gamma 2.2 curve
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* @GST_VIDEO_TRANSFER_BT709: Gamma 2.2 curve with a linear segment in the lower
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* range
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* @GST_VIDEO_TRANSFER_SMPTE240M: Gamma 2.2 curve with a linear segment in the
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* lower range
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* @GST_VIDEO_TRANSFER_SRGB: Gamma 2.4 curve with a linear segment in the lower
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* range
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* @GST_VIDEO_TRANSFER_GAMMA28: Gamma 2.8 curve
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* @GST_VIDEO_TRANSFER_LOG100: Logarithmic transfer characteristic
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* 100:1 range
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* @GST_VIDEO_TRANSFER_LOG316: Logarithmic transfer characteristic
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* 316.22777:1 range
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* @GST_VIDEO_TRANSFER_BT2020_12: Gamma 2.2 curve with a linear segment in the lower
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* range. Used for BT.2020 with 12 bits per
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* component. Since: 1.6
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* @GST_VIDEO_TRANSFER_ADOBERGB: Gamma 2.19921875. Since: 1.8
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* @GST_VIDEO_TRANSFER_BT2020_10: Rec. ITU-R BT.2020-2 with 10 bits per component.
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* (functionally the same as the values
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* GST_VIDEO_TRANSFER_BT709 and GST_VIDEO_TRANSFER_BT2020_12).
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* Since: 1.18
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* @GST_VIDEO_TRANSFER_SMPTE2084: SMPTE ST 2084 for 10, 12, 14, and 16-bit systems.
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* Known as perceptual quantization (PQ)
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* Since: 1.18
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*
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* The video transfer function defines the formula for converting between
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* non-linear RGB (R'G'B') and linear RGB
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*/
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typedef enum {
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GST_VIDEO_TRANSFER_UNKNOWN = 0,
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GST_VIDEO_TRANSFER_GAMMA10,
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GST_VIDEO_TRANSFER_GAMMA18,
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GST_VIDEO_TRANSFER_GAMMA20,
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GST_VIDEO_TRANSFER_GAMMA22,
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GST_VIDEO_TRANSFER_BT709,
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GST_VIDEO_TRANSFER_SMPTE240M,
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GST_VIDEO_TRANSFER_SRGB,
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GST_VIDEO_TRANSFER_GAMMA28,
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GST_VIDEO_TRANSFER_LOG100,
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GST_VIDEO_TRANSFER_LOG316,
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GST_VIDEO_TRANSFER_BT2020_12,
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GST_VIDEO_TRANSFER_ADOBERGB,
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GST_VIDEO_TRANSFER_BT2020_10,
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GST_VIDEO_TRANSFER_SMPTE2084
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} GstVideoTransferFunction;
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GST_VIDEO_API
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gdouble gst_video_color_transfer_encode (GstVideoTransferFunction func, gdouble val);
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GST_VIDEO_API
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gdouble gst_video_color_transfer_decode (GstVideoTransferFunction func, gdouble val);
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/**
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* GstVideoColorPrimaries:
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* @GST_VIDEO_COLOR_PRIMARIES_UNKNOWN: unknown color primaries
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* @GST_VIDEO_COLOR_PRIMARIES_BT709: BT709 primaries
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* @GST_VIDEO_COLOR_PRIMARIES_BT470M: BT470M primaries
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* @GST_VIDEO_COLOR_PRIMARIES_BT470BG: BT470BG primaries
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* @GST_VIDEO_COLOR_PRIMARIES_SMPTE170M: SMPTE170M primaries
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* @GST_VIDEO_COLOR_PRIMARIES_SMPTE240M: SMPTE240M primaries
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* @GST_VIDEO_COLOR_PRIMARIES_FILM: Generic film
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* @GST_VIDEO_COLOR_PRIMARIES_BT2020: BT2020 primaries. Since: 1.6
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* @GST_VIDEO_COLOR_PRIMARIES_ADOBERGB: Adobe RGB primaries. Since: 1.8
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* @GST_VIDEO_COLOR_PRIMARIES_SMPTEST428: SMPTE ST 428 primaries. Since: 1.16
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* @GST_VIDEO_COLOR_PRIMARIES_SMPTERP431: SMPTE RP 431 primaries. Since: 1.16
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* @GST_VIDEO_COLOR_PRIMARIES_SMPTEEG432: SMPTE EG 432 primaries. Since: 1.16
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* @GST_VIDEO_COLOR_PRIMARIES_EBU3213: EBU 3213 primaries. Since: 1.16
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*
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* The color primaries define the how to transform linear RGB values to and from
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* the CIE XYZ colorspace.
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*/
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typedef enum {
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GST_VIDEO_COLOR_PRIMARIES_UNKNOWN = 0,
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GST_VIDEO_COLOR_PRIMARIES_BT709,
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GST_VIDEO_COLOR_PRIMARIES_BT470M,
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GST_VIDEO_COLOR_PRIMARIES_BT470BG,
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GST_VIDEO_COLOR_PRIMARIES_SMPTE170M,
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GST_VIDEO_COLOR_PRIMARIES_SMPTE240M,
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GST_VIDEO_COLOR_PRIMARIES_FILM,
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GST_VIDEO_COLOR_PRIMARIES_BT2020,
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GST_VIDEO_COLOR_PRIMARIES_ADOBERGB,
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GST_VIDEO_COLOR_PRIMARIES_SMPTEST428,
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GST_VIDEO_COLOR_PRIMARIES_SMPTERP431,
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GST_VIDEO_COLOR_PRIMARIES_SMPTEEG432,
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GST_VIDEO_COLOR_PRIMARIES_EBU3213,
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} GstVideoColorPrimaries;
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/**
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* GstVideoColorPrimariesInfo:
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* @primaries: a #GstVideoColorPrimaries
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* @Wx: reference white x coordinate
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* @Wy: reference white y coordinate
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* @Rx: red x coordinate
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* @Ry: red y coordinate
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* @Gx: green x coordinate
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* @Gy: green y coordinate
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* @Bx: blue x coordinate
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* @By: blue y coordinate
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*
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* Structure describing the chromaticity coordinates of an RGB system. These
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* values can be used to construct a matrix to transform RGB to and from the
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* XYZ colorspace.
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*
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* Since: 1.6
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*/
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typedef struct {
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GstVideoColorPrimaries primaries;
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gdouble Wx, Wy;
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gdouble Rx, Ry;
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gdouble Gx, Gy;
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gdouble Bx, By;
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} GstVideoColorPrimariesInfo;
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GST_VIDEO_API
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const GstVideoColorPrimariesInfo *
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gst_video_color_primaries_get_info (GstVideoColorPrimaries primaries);
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/**
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* GstVideoColorimetry:
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* @range: the color range. This is the valid range for the samples.
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* It is used to convert the samples to Y'PbPr values.
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* @matrix: the color matrix. Used to convert between Y'PbPr and
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* non-linear RGB (R'G'B')
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* @transfer: the transfer function. used to convert between R'G'B' and RGB
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* @primaries: color primaries. used to convert between R'G'B' and CIE XYZ
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*
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* Structure describing the color info.
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*/
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typedef struct {
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GstVideoColorRange range;
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GstVideoColorMatrix matrix;
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GstVideoTransferFunction transfer;
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GstVideoColorPrimaries primaries;
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} GstVideoColorimetry;
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/* predefined colorimetry */
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#define GST_VIDEO_COLORIMETRY_BT601 "bt601"
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#define GST_VIDEO_COLORIMETRY_BT709 "bt709"
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#define GST_VIDEO_COLORIMETRY_SMPTE240M "smpte240m"
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#define GST_VIDEO_COLORIMETRY_SRGB "sRGB"
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#define GST_VIDEO_COLORIMETRY_BT2020 "bt2020"
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#define GST_VIDEO_COLORIMETRY_BT2020_10 "bt2020-10"
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#define GST_VIDEO_COLORIMETRY_BT2100_PQ "bt2100-pq"
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GST_VIDEO_API
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gboolean gst_video_colorimetry_matches (const GstVideoColorimetry *cinfo, const gchar *color);
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GST_VIDEO_API
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gboolean gst_video_colorimetry_from_string (GstVideoColorimetry *cinfo, const gchar *color);
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GST_VIDEO_API
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gchar * gst_video_colorimetry_to_string (const GstVideoColorimetry *cinfo);
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GST_VIDEO_API
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gboolean gst_video_colorimetry_is_equal (const GstVideoColorimetry *cinfo, const GstVideoColorimetry *other);
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/* compute offset and scale */
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GST_VIDEO_API
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void gst_video_color_range_offsets (GstVideoColorRange range,
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const GstVideoFormatInfo *info,
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gint offset[GST_VIDEO_MAX_COMPONENTS],
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gint scale[GST_VIDEO_MAX_COMPONENTS]);
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G_END_DECLS
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#endif /* __GST_VIDEO_COLOR_H__ */
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