[media] v4l2-tpg: don't clamp XV601/709 to lim range (4aed35ca) · Commits · 戴 / test

The XV601/709 encodings are special: they signal limited range, but use the full range to encode a larger gamut with R', G' and B' values outside the [0-1] range. So don't clamp to limited range for these two encodings. Signed-off-by:

Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by:

Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/common/v4l2-tpg/v4l2-tpg-core.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -927,7 +927,14 @@ static void precalculate_color(struct tpg_data *tpg, int k)
		y >>= 4;
		cb >>= 4;
		cr >>= 4;
		if (tpg->real_quantization == V4L2_QUANTIZATION_LIM_RANGE) {
		/*
		* XV601/709 use the header/footer margins to encode R', G'
		* and B' values outside the range [0-1]. So do not clamp
		* XV601/709 values.
		*/
		if (tpg->real_quantization == V4L2_QUANTIZATION_LIM_RANGE &&
		tpg->real_ycbcr_enc != V4L2_YCBCR_ENC_XV601 &&
		tpg->real_ycbcr_enc != V4L2_YCBCR_ENC_XV709) {
		y = clamp(y, 16, 235);
		cb = clamp(cb, 16, 240);
		cr = clamp(cr, 16, 240);

Admin message