From 9d2f9d16a14e00489f8b8b22f12031836e64f282 Mon Sep 17 00:00:00 2001
From: Seungha Yang <seungha.yang@navercorp.com>
Date: Sun, 5 May 2019 19:08:55 +0900
Subject: [PATCH] video-color: Define bt2020-10 transfer characteristics for
 clarity

bt707, bt2020-10, and bt2020-12 transfer characteristics are functionally
identical but have their own unique values by specification.
---
 gst-libs/gst/video/video-color.c | 3 +++
 gst-libs/gst/video/video-color.h | 8 +++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gst-libs/gst/video/video-color.c b/gst-libs/gst/video/video-color.c
index e2cac8203d..c23033daae 100644
--- a/gst-libs/gst/video/video-color.c
+++ b/gst-libs/gst/video/video-color.c
@@ -76,6 +76,7 @@ static const ColorimetryInfo colorimetry[] = {
   MAKE_COLORIMETRY (SMPTE240M, _16_235, SMPTE240M, SMPTE240M, SMPTE240M),
   MAKE_COLORIMETRY (SRGB, _0_255, RGB, SRGB, BT709),
   MAKE_COLORIMETRY (BT2020, _16_235, BT2020, BT2020_12, BT2020),
+  MAKE_COLORIMETRY (BT2020_10, _16_235, BT2020, BT2020_10, BT2020),
   MAKE_COLORIMETRY (NONAME, _0_255, BT601, UNKNOWN, UNKNOWN),
   MAKE_COLORIMETRY (NONAME, _UNKNOWN, UNKNOWN, UNKNOWN, UNKNOWN),
 };
@@ -434,6 +435,7 @@ gst_video_color_transfer_encode (GstVideoTransferFunction func, gdouble val)
       res = pow (val, 1.0 / 2.2);
       break;
     case GST_VIDEO_TRANSFER_BT709:
+    case GST_VIDEO_TRANSFER_BT2020_10:
       if (val < 0.018)
         res = 4.5 * val;
       else
@@ -522,6 +524,7 @@ gst_video_color_transfer_decode (GstVideoTransferFunction func, gdouble val)
       res = pow (val, 2.2);
       break;
     case GST_VIDEO_TRANSFER_BT709:
+    case GST_VIDEO_TRANSFER_BT2020_10:
       if (val < 0.081)
         res = val / 4.5;
       else
diff --git a/gst-libs/gst/video/video-color.h b/gst-libs/gst/video/video-color.h
index 31a7fab081..4dc6b912ff 100644
--- a/gst-libs/gst/video/video-color.h
+++ b/gst-libs/gst/video/video-color.h
@@ -90,6 +90,10 @@ gboolean gst_video_color_matrix_get_Kr_Kb (GstVideoColorMatrix matrix, gdouble *
  *                                range. Used for BT.2020 with 12 bits per
  *                                component. Since: 1.6
  * @GST_VIDEO_TRANSFER_ADOBERGB: Gamma 2.19921875. Since: 1.8
+ * @GST_VIDEO_TRANSFER_BT2020_10: Rec. ITU-R BT.2020-2 with 10 bits per component.
+ *                                (functionally the same as the values
+ *                                GST_VIDEO_TRANSFER_BT709 and GST_VIDEO_TRANSFER_BT2020_12).
+ *                                Since: 1.18
  *
  * The video transfer function defines the formula for converting between
  * non-linear RGB (R'G'B') and linear RGB
@@ -107,7 +111,8 @@ typedef enum {
   GST_VIDEO_TRANSFER_LOG100,
   GST_VIDEO_TRANSFER_LOG316,
   GST_VIDEO_TRANSFER_BT2020_12,
-  GST_VIDEO_TRANSFER_ADOBERGB
+  GST_VIDEO_TRANSFER_ADOBERGB,
+  GST_VIDEO_TRANSFER_BT2020_10
 } GstVideoTransferFunction;
 
 GST_VIDEO_API
@@ -205,6 +210,7 @@ typedef struct {
 #define GST_VIDEO_COLORIMETRY_SMPTE240M   "smpte240m"
 #define GST_VIDEO_COLORIMETRY_SRGB        "sRGB"
 #define GST_VIDEO_COLORIMETRY_BT2020      "bt2020"
+#define GST_VIDEO_COLORIMETRY_BT2020_10   "bt2020-10"
 
 GST_VIDEO_API
 gboolean     gst_video_colorimetry_matches     (const GstVideoColorimetry *cinfo, const gchar *color);