[RFC v4 7/8] media: vivid: Add support to the CSC API

[Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>]

The CSC API (Colorspace conversion) allows userspace to try
to configure the ycbcr/hsv_enc function and the quantization
for capture devices. This patch adds support to the CSC API
in vivid.
Using the CSC API, userspace is allowed to do the following:

1. Set the ycbcr_enc function for YUV formats.
2. Set the hsv_enc function for HSV formats
3. Set the quantization for YUV and RGB formats.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>
---
 .../media/test-drivers/vivid/vivid-vid-cap.c  | 49 +++++++++++++++++--
 .../test-drivers/vivid/vivid-vid-common.c     | 20 ++++++++
 2 files changed, 65 insertions(+), 4 deletions(-)

diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
index e94beef008c8..8a43d7ebe53f 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
@@ -549,6 +549,29 @@ int vivid_g_fmt_vid_cap(struct file *file, void *priv,
 	return 0;
 }
 
+static bool vivid_is_hsv_enc_valid(__u8 hsv_enc)
+{
+	if (hsv_enc == V4L2_HSV_ENC_180 || hsv_enc == V4L2_HSV_ENC_256)
+		return true;
+	return false;
+}
+
+static bool vivid_is_ycbcr_enc_valid(__u8 ycbcr_enc)
+{
+	/* V4L2_YCBCR_ENC_SMPTE240M is the last ycbcr_enc enum */
+	if (ycbcr_enc && ycbcr_enc <= V4L2_YCBCR_ENC_SMPTE240M)
+		return true;
+	return false;
+}
+
+static bool vivid_is_quant_valid(__u8 quantization)
+{
+	if (quantization == V4L2_QUANTIZATION_FULL_RANGE ||
+	    quantization == V4L2_QUANTIZATION_LIM_RANGE)
+		return true;
+	return false;
+}
+
 int vivid_try_fmt_vid_cap(struct file *file, void *priv,
 			struct v4l2_format *f)
 {
@@ -560,6 +583,7 @@ int vivid_try_fmt_vid_cap(struct file *file, void *priv,
 	unsigned factor = 1;
 	unsigned w, h;
 	unsigned p;
+	bool user_set_csc = !!(mp->flags & V4L2_PIX_FMT_FLAG_SET_CSC);
 
 	fmt = vivid_get_format(dev, mp->pixelformat);
 	if (!fmt) {
@@ -634,12 +658,23 @@ int vivid_try_fmt_vid_cap(struct file *file, void *priv,
 			(fmt->bit_depth[0] / fmt->vdownsampling[0]);
 
 	mp->colorspace = vivid_colorspace_cap(dev);
-	if (fmt->color_enc == TGP_COLOR_ENC_HSV)
-		mp->hsv_enc = vivid_hsv_enc_cap(dev);
-	else
+	if (fmt->color_enc == TGP_COLOR_ENC_HSV) {
+		if (!user_set_csc || !vivid_is_hsv_enc_valid(mp->hsv_enc))
+			mp->hsv_enc = vivid_hsv_enc_cap(dev);
+	} else if (fmt->color_enc == TGP_COLOR_ENC_YCBCR) {
+		if (!user_set_csc || !vivid_is_ycbcr_enc_valid(mp->ycbcr_enc))
+			mp->ycbcr_enc = vivid_ycbcr_enc_cap(dev);
+	} else {
 		mp->ycbcr_enc = vivid_ycbcr_enc_cap(dev);
+	}
 	mp->xfer_func = vivid_xfer_func_cap(dev);
-	mp->quantization = vivid_quantization_cap(dev);
+	if (fmt->color_enc == TGP_COLOR_ENC_YCBCR ||
+	    fmt->color_enc == TGP_COLOR_ENC_RGB) {
+		if (!user_set_csc || !vivid_is_quant_valid(mp->quantization))
+			mp->quantization = vivid_quantization_cap(dev);
+	} else {
+		mp->quantization = vivid_quantization_cap(dev);
+	}
 	memset(mp->reserved, 0, sizeof(mp->reserved));
 	return 0;
 }
@@ -769,6 +804,12 @@ int vivid_s_fmt_vid_cap(struct file *file, void *priv,
 	if (vivid_is_sdtv_cap(dev))
 		dev->tv_field_cap = mp->field;
 	tpg_update_mv_step(&dev->tpg);
+	dev->tpg.quantization = mp->quantization;
+	if (dev->fmt_cap->color_enc == TGP_COLOR_ENC_YCBCR)
+		dev->tpg.ycbcr_enc = mp->ycbcr_enc;
+	else
+		dev->tpg.hsv_enc = mp->hsv_enc;
+
 	return 0;
 }
 
diff --git a/drivers/media/test-drivers/vivid/vivid-vid-common.c b/drivers/media/test-drivers/vivid/vivid-vid-common.c
index 76b0be670ebb..19aacb180e67 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-common.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-common.c
@@ -920,6 +920,26 @@ int vivid_enum_fmt_vid(struct file *file, void  *priv,
 	fmt = &vivid_formats[f->index];
 
 	f->pixelformat = fmt->fourcc;
+
+	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
+	    f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+		return 0;
+	/*
+	 * For capture devices, we support the CSC API.
+	 * We allow userspace to:
+	 * 1. set the ycbcr_enc on yuv format
+	 * 2. set the hsv_enc on hsv format
+	 * 3. set the quantization on yuv and rgb formats
+	 */
+	if (fmt->color_enc == TGP_COLOR_ENC_YCBCR) {
+		f->flags |= V4L2_FMT_FLAG_CSC_YCBCR_ENC;
+		f->flags |= V4L2_FMT_FLAG_CSC_QUANTIZATION;
+	} else if (fmt->color_enc == TGP_COLOR_ENC_HSV) {
+		f->flags |= V4L2_FMT_FLAG_CSC_HSV_ENC;
+	} else if (fmt->color_enc == TGP_COLOR_ENC_RGB) {
+		f->flags |= V4L2_FMT_FLAG_CSC_QUANTIZATION;
+	}
+
 	return 0;
 }
 
-- 
2.17.1