From afad4dd50acbe6457413ec6a68708433d9824d37 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 27 Jan 2015 13:46:17 -0300 Subject: [PATCH] [media] vivid: Y offset should depend on quant. range When converting to or from Y'CbCr and R'G'B' the Y offset depends on the quantization range: it's 0 for full and 16 for limited range. But in the code it was hardcoded to 16. This messed up the brightness of the generated pattern. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/vivid/vivid-tpg.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/media/platform/vivid/vivid-tpg.c b/drivers/media/platform/vivid/vivid-tpg.c index fc9c6536ba02..34493f435d5a 100644 --- a/drivers/media/platform/vivid/vivid-tpg.c +++ b/drivers/media/platform/vivid/vivid-tpg.c @@ -352,13 +352,14 @@ static void color_to_ycbcr(struct tpg_data *tpg, int r, int g, int b, { COEFF(0.5, 224), COEFF(-0.4629, 224), COEFF(-0.0405, 224) }, }; bool full = tpg->real_quantization == V4L2_QUANTIZATION_FULL_RANGE; + unsigned y_offset = full ? 0 : 16; int lin_y, yc; switch (tpg->real_ycbcr_enc) { case V4L2_YCBCR_ENC_601: case V4L2_YCBCR_ENC_XV601: case V4L2_YCBCR_ENC_SYCC: - rgb2ycbcr(full ? bt601_full : bt601, r, g, b, 16, y, cb, cr); + rgb2ycbcr(full ? bt601_full : bt601, r, g, b, y_offset, y, cb, cr); break; case V4L2_YCBCR_ENC_BT2020: rgb2ycbcr(bt2020, r, g, b, 16, y, cb, cr); @@ -384,7 +385,7 @@ static void color_to_ycbcr(struct tpg_data *tpg, int r, int g, int b, case V4L2_YCBCR_ENC_709: case V4L2_YCBCR_ENC_XV709: default: - rgb2ycbcr(full ? rec709_full : rec709, r, g, b, 0, y, cb, cr); + rgb2ycbcr(full ? rec709_full : rec709, r, g, b, y_offset, y, cb, cr); break; } } @@ -439,13 +440,14 @@ static void ycbcr_to_color(struct tpg_data *tpg, int y, int cb, int cr, { COEFF(1, 219), COEFF(1.8814, 224), COEFF(0, 224) }, }; bool full = tpg->real_quantization == V4L2_QUANTIZATION_FULL_RANGE; + unsigned y_offset = full ? 0 : 16; int lin_r, lin_g, lin_b, lin_y; switch (tpg->real_ycbcr_enc) { case V4L2_YCBCR_ENC_601: case V4L2_YCBCR_ENC_XV601: case V4L2_YCBCR_ENC_SYCC: - ycbcr2rgb(full ? bt601_full : bt601, y, cb, cr, 16, r, g, b); + ycbcr2rgb(full ? bt601_full : bt601, y, cb, cr, y_offset, r, g, b); break; case V4L2_YCBCR_ENC_BT2020: ycbcr2rgb(bt2020, y, cb, cr, 16, r, g, b); @@ -480,7 +482,7 @@ static void ycbcr_to_color(struct tpg_data *tpg, int y, int cb, int cr, case V4L2_YCBCR_ENC_709: case V4L2_YCBCR_ENC_XV709: default: - ycbcr2rgb(full ? rec709_full : rec709, y, cb, cr, 16, r, g, b); + ycbcr2rgb(full ? rec709_full : rec709, y, cb, cr, y_offset, r, g, b); break; } } -- 2.20.1