Commit 614014cf authored by Steve Longerbeam's avatar Steve Longerbeam Committed by Philipp Zabel
Browse files

gpu: ipu-v3: ipu-ic-csc: Add support for Rec.709 encoding 



Add support for Rec.709 encoding and inverse encoding.

Reported-by: default avatarTim Harvey <tharvey@gateworks.com>
Signed-off-by: default avatarSteve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent e3e4820d

drivers/gpu/ipu-v3/ipu-ic-csc.c

+134 −5
Original line number Diff line number Diff line
@@ -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 */



	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];