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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>
This commit is contained in:
Steve Longerbeam 2019-05-21 18:03:16 -07:00 committed by Philipp Zabel
parent e3e4820d05
commit 614014cfc1
1 changed files with 134 additions and 5 deletions
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139
drivers/gpu/ipu-v3/ipu-ic-csc.c
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@ -230,14 +230,133 @@ static const struct ipu_ic_csc_params *yuv2rgb_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;
if (csc->out_cs.enc != V4L2_YCBCR_ENC_601)
return -ENOTSUPP;
tbl_idx = (QUANT_MAP(csc->in_cs.quant) << 1) |
QUANT_MAP(csc->out_cs.quant);
@ -250,8 +369,18 @@ static int calc_csc_coeffs(struct ipu_ic_csc *csc)
/* YUV <-> RGB encoding is required */
params_tbl = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ?
yuv2rgb_601 : rgb2yuv_601;
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];