linux/drivers/gpu/ipu-v3/ipu-ic-csc.c
Steve Longerbeam 614014cfc1 gpu: ipu-v3: ipu-ic-csc: Add support for Rec.709 encoding
Add support for Rec.709 encoding and inverse encoding.

Reported-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
2019-06-14 15:33:02 +02:00

410 lines
8.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Mentor Graphics Inc.
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/sizes.h>
#include "ipu-prv.h"
#define QUANT_MAP(q) \
((q) == V4L2_QUANTIZATION_FULL_RANGE || \
(q) == V4L2_QUANTIZATION_DEFAULT ? 0 : 1)
/* identity matrix */
static const struct ipu_ic_csc_params identity = {
.coeff = {
{ 128, 0, 0, },
{ 0, 128, 0, },
{ 0, 0, 128, },
},
.offset = { 0, 0, 0, },
.scale = 2,
};
/*
* RGB full-range to RGB limited-range
*
* R_lim = 0.8588 * R_full + 16
* G_lim = 0.8588 * G_full + 16
* B_lim = 0.8588 * B_full + 16
*/
static const struct ipu_ic_csc_params rgbf2rgbl = {
.coeff = {
{ 220, 0, 0, },
{ 0, 220, 0, },
{ 0, 0, 220, },
},
.offset = { 64, 64, 64, },
.scale = 1,
};
/*
* RGB limited-range to RGB full-range
*
* R_full = 1.1644 * (R_lim - 16)
* G_full = 1.1644 * (G_lim - 16)
* B_full = 1.1644 * (B_lim - 16)
*/
static const struct ipu_ic_csc_params rgbl2rgbf = {
.coeff = {
{ 149, 0, 0, },
{ 0, 149, 0, },
{ 0, 0, 149, },
},
.offset = { -37, -37, -37, },
.scale = 2,
};
/*
* YUV full-range to YUV limited-range
*
* Y_lim = 0.8588 * Y_full + 16
* Cb_lim = 0.8784 * (Cb_full - 128) + 128
* Cr_lim = 0.8784 * (Cr_full - 128) + 128
*/
static const struct ipu_ic_csc_params yuvf2yuvl = {
.coeff = {
{ 220, 0, 0, },
{ 0, 225, 0, },
{ 0, 0, 225, },
},
.offset = { 64, 62, 62, },
.scale = 1,
.sat = true,
};
/*
* YUV limited-range to YUV full-range
*
* Y_full = 1.1644 * (Y_lim - 16)
* Cb_full = 1.1384 * (Cb_lim - 128) + 128
* Cr_full = 1.1384 * (Cr_lim - 128) + 128
*/
static const struct ipu_ic_csc_params yuvl2yuvf = {
.coeff = {
{ 149, 0, 0, },
{ 0, 146, 0, },
{ 0, 0, 146, },
},
.offset = { -37, -35, -35, },
.scale = 2,
};
static const struct ipu_ic_csc_params *rgb2rgb[] = {
&identity,
&rgbf2rgbl,
&rgbl2rgbf,
&identity,
};
static const struct ipu_ic_csc_params *yuv2yuv[] = {
&identity,
&yuvf2yuvl,
&yuvl2yuvf,
&identity,
};
/*
* BT.601 RGB full-range to YUV full-range
*
* Y = .2990 * R + .5870 * G + .1140 * B
* U = -.1687 * R - .3313 * G + .5000 * B + 128
* V = .5000 * R - .4187 * G - .0813 * B + 128
*/
static const struct ipu_ic_csc_params rgbf2yuvf_601 = {
.coeff = {
{ 77, 150, 29, },
{ -43, -85, 128, },
{ 128, -107, -21, },
},
.offset = { 0, 512, 512, },
.scale = 1,
};
/* BT.601 RGB full-range to YUV limited-range */
static const struct ipu_ic_csc_params rgbf2yuvl_601 = {
.coeff = {
{ 66, 129, 25, },
{ -38, -74, 112, },
{ 112, -94, -18, },
},
.offset = { 64, 512, 512, },
.scale = 1,
.sat = true,
};
/* BT.601 RGB limited-range to YUV full-range */
static const struct ipu_ic_csc_params rgbl2yuvf_601 = {
.coeff = {
{ 89, 175, 34, },
{ -50, -99, 149, },
{ 149, -125, -24, },
},
.offset = { -75, 512, 512, },
.scale = 1,
};
/* BT.601 RGB limited-range to YUV limited-range */
static const struct ipu_ic_csc_params rgbl2yuvl_601 = {
.coeff = {
{ 77, 150, 29, },
{ -44, -87, 131, },
{ 131, -110, -21, },
},
.offset = { 0, 512, 512, },
.scale = 1,
.sat = true,
};
/*
* BT.601 YUV full-range to RGB full-range
*
* R = 1. * Y + 0 * (Cb - 128) + 1.4020 * (Cr - 128)
* G = 1. * Y - .3441 * (Cb - 128) - .7141 * (Cr - 128)
* B = 1. * Y + 1.7720 * (Cb - 128) + 0 * (Cr - 128)
*
* equivalently (factoring out the offsets):
*
* R = 1. * Y + 0 * Cb + 1.4020 * Cr - 179.456
* G = 1. * Y - .3441 * Cb - .7141 * Cr + 135.450
* B = 1. * Y + 1.7720 * Cb + 0 * Cr - 226.816
*/
static const struct ipu_ic_csc_params yuvf2rgbf_601 = {
.coeff = {
{ 128, 0, 179, },
{ 128, -44, -91, },
{ 128, 227, 0, },
},
.offset = { -359, 271, -454, },
.scale = 2,
};
/* BT.601 YUV full-range to RGB limited-range */
static const struct ipu_ic_csc_params yuvf2rgbl_601 = {
.coeff = {
{ 110, 0, 154, },
{ 110, -38, -78, },
{ 110, 195, 0, },
},
.offset = { -276, 265, -358, },
.scale = 2,
};
/* BT.601 YUV limited-range to RGB full-range */
static const struct ipu_ic_csc_params yuvl2rgbf_601 = {
.coeff = {
{ 75, 0, 102, },
{ 75, -25, -52, },
{ 75, 129, 0, },
},
.offset = { -223, 136, -277, },
.scale = 3,
};
/* BT.601 YUV limited-range to RGB limited-range */
static const struct ipu_ic_csc_params yuvl2rgbl_601 = {
.coeff = {
{ 128, 0, 175, },
{ 128, -43, -89, },
{ 128, 222, 0, },
},
.offset = { -351, 265, -443, },
.scale = 2,
};
static const struct ipu_ic_csc_params *rgb2yuv_601[] = {
&rgbf2yuvf_601,
&rgbf2yuvl_601,
&rgbl2yuvf_601,
&rgbl2yuvl_601,
};
static const struct ipu_ic_csc_params *yuv2rgb_601[] = {
&yuvf2rgbf_601,
&yuvf2rgbl_601,
&yuvl2rgbf_601,
&yuvl2rgbl_601,
};
/*
* REC.709 encoding from RGB full range to YUV full range:
*
* Y = .2126 * R + .7152 * G + .0722 * B
* U = -.1146 * R - .3854 * G + .5000 * B + 128
* V = .5000 * R - .4542 * G - .0458 * B + 128
*/
static const struct ipu_ic_csc_params rgbf2yuvf_709 = {
.coeff = {
{ 54, 183, 19 },
{ -29, -99, 128 },
{ 128, -116, -12 },
},
.offset = { 0, 512, 512 },
.scale = 1,
};
/* Rec.709 RGB full-range to YUV limited-range */
static const struct ipu_ic_csc_params rgbf2yuvl_709 = {
.coeff = {
{ 47, 157, 16, },
{ -26, -87, 112, },
{ 112, -102, -10, },
},
.offset = { 64, 512, 512, },
.scale = 1,
.sat = true,
};
/* Rec.709 RGB limited-range to YUV full-range */
static const struct ipu_ic_csc_params rgbl2yuvf_709 = {
.coeff = {
{ 63, 213, 22, },
{ -34, -115, 149, },
{ 149, -135, -14, },
},
.offset = { -75, 512, 512, },
.scale = 1,
};
/* Rec.709 RGB limited-range to YUV limited-range */
static const struct ipu_ic_csc_params rgbl2yuvl_709 = {
.coeff = {
{ 54, 183, 18, },
{ -30, -101, 131, },
{ 131, -119, -12, },
},
.offset = { 0, 512, 512, },
.scale = 1,
.sat = true,
};
/*
* Inverse REC.709 encoding from YUV full range to RGB full range:
*
* R = 1. * Y + 0 * (Cb - 128) + 1.5748 * (Cr - 128)
* G = 1. * Y - .1873 * (Cb - 128) - .4681 * (Cr - 128)
* B = 1. * Y + 1.8556 * (Cb - 128) + 0 * (Cr - 128)
*
* equivalently (factoring out the offsets):
*
* R = 1. * Y + 0 * Cb + 1.5748 * Cr - 201.574
* G = 1. * Y - .1873 * Cb - .4681 * Cr + 83.891
* B = 1. * Y + 1.8556 * Cb + 0 * Cr - 237.517
*/
static const struct ipu_ic_csc_params yuvf2rgbf_709 = {
.coeff = {
{ 128, 0, 202 },
{ 128, -24, -60 },
{ 128, 238, 0 },
},
.offset = { -403, 168, -475 },
.scale = 2,
};
/* Rec.709 YUV full-range to RGB limited-range */
static const struct ipu_ic_csc_params yuvf2rgbl_709 = {
.coeff = {
{ 110, 0, 173, },
{ 110, -21, -51, },
{ 110, 204, 0, },
},
.offset = { -314, 176, -376, },
.scale = 2,
};
/* Rec.709 YUV limited-range to RGB full-range */
static const struct ipu_ic_csc_params yuvl2rgbf_709 = {
.coeff = {
{ 75, 0, 115, },
{ 75, -14, -34, },
{ 75, 135, 0, },
},
.offset = { -248, 77, -289, },
.scale = 3,
};
/* Rec.709 YUV limited-range to RGB limited-range */
static const struct ipu_ic_csc_params yuvl2rgbl_709 = {
.coeff = {
{ 128, 0, 197, },
{ 128, -23, -59, },
{ 128, 232, 0, },
},
.offset = { -394, 164, -464, },
.scale = 2,
};
static const struct ipu_ic_csc_params *rgb2yuv_709[] = {
&rgbf2yuvf_709,
&rgbf2yuvl_709,
&rgbl2yuvf_709,
&rgbl2yuvl_709,
};
static const struct ipu_ic_csc_params *yuv2rgb_709[] = {
&yuvf2rgbf_709,
&yuvf2rgbl_709,
&yuvl2rgbf_709,
&yuvl2rgbl_709,
};
static int calc_csc_coeffs(struct ipu_ic_csc *csc)
{
const struct ipu_ic_csc_params **params_tbl;
int tbl_idx;
tbl_idx = (QUANT_MAP(csc->in_cs.quant) << 1) |
QUANT_MAP(csc->out_cs.quant);
if (csc->in_cs.cs == csc->out_cs.cs) {
csc->params = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?
*yuv2yuv[tbl_idx] : *rgb2rgb[tbl_idx];
return 0;
}
/* YUV <-> RGB encoding is required */
switch (csc->out_cs.enc) {
case V4L2_YCBCR_ENC_601:
params_tbl = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?
yuv2rgb_601 : rgb2yuv_601;
break;
case V4L2_YCBCR_ENC_709:
params_tbl = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?
yuv2rgb_709 : rgb2yuv_709;
break;
default:
return -ENOTSUPP;
}
csc->params = *params_tbl[tbl_idx];
return 0;
}
int __ipu_ic_calc_csc(struct ipu_ic_csc *csc)
{
return calc_csc_coeffs(csc);
}
EXPORT_SYMBOL_GPL(__ipu_ic_calc_csc);
int ipu_ic_calc_csc(struct ipu_ic_csc *csc,
enum v4l2_ycbcr_encoding in_enc,
enum v4l2_quantization in_quant,
enum ipu_color_space in_cs,
enum v4l2_ycbcr_encoding out_enc,
enum v4l2_quantization out_quant,
enum ipu_color_space out_cs)
{
ipu_ic_fill_colorspace(&csc->in_cs, in_enc, in_quant, in_cs);
ipu_ic_fill_colorspace(&csc->out_cs, out_enc, out_quant, out_cs);
return __ipu_ic_calc_csc(csc);
}
EXPORT_SYMBOL_GPL(ipu_ic_calc_csc);