Add support for encodings to or from limited range quantization.
Signed-off-by: Steve Longerbeam slongerbeam@gmail.com --- Changes in v7: - hard-code the coefficients instead of deriving the limited range coefficients from the full2full coefficients on the fly with fixed-point math. - add support for RGB limited-range. --- drivers/gpu/ipu-v3/ipu-ic-csc.c | 180 +++++++++++++++++++++++++++++--- 1 file changed, 166 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/ipu-v3/ipu-ic-csc.c b/drivers/gpu/ipu-v3/ipu-ic-csc.c index 5fb469cd64fe..8e9150b1d668 100644 --- a/drivers/gpu/ipu-v3/ipu-ic-csc.c +++ b/drivers/gpu/ipu-v3/ipu-ic-csc.c @@ -10,6 +10,10 @@ #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 = { @@ -21,12 +25,87 @@ static const struct ipu_ic_csc_params identity = { .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, };
/* @@ -46,6 +125,41 @@ static const struct ipu_ic_csc_params rgbf2yuvf_601 = { .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 * @@ -69,39 +183,77 @@ static const struct ipu_ic_csc_params yuvf2rgbf_601 = { .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, };
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;
- if ((csc->in_cs.cs == IPUV3_COLORSPACE_YUV && - csc->in_cs.quant != V4L2_QUANTIZATION_FULL_RANGE) || - (csc->out_cs.cs == IPUV3_COLORSPACE_YUV && - csc->out_cs.quant != V4L2_QUANTIZATION_FULL_RANGE)) - return -ENOTSUPP; - - if ((csc->in_cs.cs == IPUV3_COLORSPACE_RGB && - csc->in_cs.quant != V4L2_QUANTIZATION_FULL_RANGE) || - (csc->out_cs.cs == IPUV3_COLORSPACE_RGB && - csc->out_cs.quant != V4L2_QUANTIZATION_FULL_RANGE)) - return -ENOTSUPP; + 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[0] : *rgb2rgb[0]; + *yuv2yuv[tbl_idx] : *rgb2rgb[tbl_idx]; + return 0; }
- csc->params = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ? - *yuv2rgb_601[0] : *rgb2yuv_601[0]; + /* YUV <-> RGB encoding is required */ + + params_tbl = (csc->in_cs.cs == IPUV3_COLORSPACE_YUV) ? + yuv2rgb_601 : rgb2yuv_601; + + csc->params = *params_tbl[tbl_idx];
return 0; }