[PATCH v4l-utils 1/4] v4l2-ctl: vidcap: Add support for the CSC API

[Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>]

With the CSC API, capture drivers can allow userspace to request
to set the quantization or the ycbcr_enc/hsv_enc fields of the
pixelformat. This patch adds supports for this feature.
when calling 'v4l2-ctl --set-fmt-video' on capture devices
userspace can ask to change the quantization or the ycbcr/hsv_enc
of the format if the driver supports it.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>
---
 utils/v4l2-compliance/v4l2-test-formats.cpp |  3 ++-
 utils/v4l2-ctl/v4l2-ctl-vidcap.cpp          | 22 +++++++++++++++++++--
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/utils/v4l2-compliance/v4l2-test-formats.cpp b/utils/v4l2-compliance/v4l2-test-formats.cpp
index e1b00f3c..085f4986 100644
--- a/utils/v4l2-compliance/v4l2-test-formats.cpp
+++ b/utils/v4l2-compliance/v4l2-test-formats.cpp
@@ -264,7 +264,8 @@ static int testEnumFormatsType(struct node *node, unsigned type)
 			return fail("drivers must never set the emulated flag\n");
 		if (fmtdesc.flags & ~(V4L2_FMT_FLAG_COMPRESSED | V4L2_FMT_FLAG_EMULATED |
 				      V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM |
-				      V4L2_FMT_FLAG_DYN_RESOLUTION))
+				      V4L2_FMT_FLAG_DYN_RESOLUTION | V4L2_FMT_FLAG_CSC_YCBCR_ENC |
+				      V4L2_FMT_FLAG_CSC_HSV_ENC | V4L2_FMT_FLAG_CSC_QUANTIZATION))
 			return fail("unknown flag %08x returned\n", fmtdesc.flags);
 		if (!(fmtdesc.flags & V4L2_FMT_FLAG_COMPRESSED))
 			fail_on_test(fmtdesc.flags & (V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM |
diff --git a/utils/v4l2-ctl/v4l2-ctl-vidcap.cpp b/utils/v4l2-ctl/v4l2-ctl-vidcap.cpp
index 80312b51..5cb529c8 100644
--- a/utils/v4l2-ctl/v4l2-ctl-vidcap.cpp
+++ b/utils/v4l2-ctl/v4l2-ctl-vidcap.cpp
@@ -21,6 +21,7 @@ static struct v4l2_frmsizeenum frmsize; /* list frame sizes */
 static struct v4l2_frmivalenum frmival; /* list frame intervals */
 static unsigned set_fmts;
 static __u32 width, height, pixfmt, field, flags;
+static __u32 ycbcr, quantization;
 static __u32 bytesperline[VIDEO_MAX_PLANES];
 static __u32 sizeimage[VIDEO_MAX_PLANES];
 
@@ -101,7 +102,7 @@ static void print_video_fields(int fd)
 
 void vidcap_cmd(int ch, char *optarg)
 {
-	__u32 colorspace, xfer_func, ycbcr, quantization;
+	__u32 colorspace, xfer_func;
 	char *value, *subs;
 	bool be_pixfmt;
 
@@ -112,7 +113,7 @@ void vidcap_cmd(int ch, char *optarg)
 				xfer_func, ycbcr, quantization, flags, bytesperline,
 				sizeimage);
 		if (!set_fmts ||
-		    (set_fmts & (FmtColorspace | FmtYCbCr | FmtQuantization | FmtXferFunc))) {
+		    (set_fmts & (FmtColorspace | FmtXferFunc))) {
 			vidcap_usage();
 			std::exit(EXIT_FAILURE);
 		}
@@ -220,6 +221,15 @@ int vidcap_get_and_update_fmt(cv4l_fd &_fd, struct v4l2_format &vfmt)
 				vfmt.fmt.pix_mp.plane_fmt[i].sizeimage =
 					sizeimage[i];
 		}
+
+		if (set_fmts & FmtYCbCr) {
+			vfmt.fmt.pix_mp.flags |= V4L2_PIX_FMT_FLAG_SET_CSC;
+			vfmt.fmt.pix_mp.ycbcr_enc = ycbcr;
+		}
+		if (set_fmts & FmtQuantization) {
+			vfmt.fmt.pix_mp.flags |= V4L2_PIX_FMT_FLAG_SET_CSC;
+			vfmt.fmt.pix_mp.quantization = quantization;
+		}
 	} else {
 		if (set_fmts & FmtWidth)
 			vfmt.fmt.pix.width = width;
@@ -249,6 +259,14 @@ int vidcap_get_and_update_fmt(cv4l_fd &_fd, struct v4l2_format &vfmt)
 		}
 		if (set_fmts & FmtSizeImage)
 			vfmt.fmt.pix.sizeimage = sizeimage[0];
+		if (set_fmts & FmtYCbCr) {
+			vfmt.fmt.pix.flags |= V4L2_PIX_FMT_FLAG_SET_CSC;
+			vfmt.fmt.pix.ycbcr_enc = ycbcr;
+		}
+		if (set_fmts & FmtQuantization) {
+			vfmt.fmt.pix.flags |= V4L2_PIX_FMT_FLAG_SET_CSC;
+			vfmt.fmt.pix.quantization = quantization;
+		}
 	}
 
 	if ((set_fmts & FmtPixelFormat) &&
-- 
2.17.1