Add partial Rec. 2020 support.

[movit] / image_format.h

diff --git a/image_format.h b/image_format.h
index 3766235db670f3437d427d52e851597e2190c424..df6f48747cdc3e933dfa6cdaf6cec88f544b14a3 100644 (file)
--- a/image_format.h
+++ b/image_format.h
@@ -1,6 +1,12 @@
 #ifndef _MOVIT_IMAGE_FORMAT_H
 #define _MOVIT_IMAGE_FORMAT_H 1
 
+// Note: Input depths above 8 bits have not been tested, so Rec. 2020
+// support should be regarded as somewhat untested (it assumes 10-
+// or 12-bit input). We also only support “conventional non-constant
+// luminance” for Rec. 2020, where Y' is derived from R'G'B' instead of
+// RGB, since this is the same system as used in Rec. 601 and 709.
+
 enum MovitPixelFormat {
        FORMAT_RGB,
        FORMAT_RGBA_PREMULTIPLIED_ALPHA,
@@ -18,6 +24,7 @@ enum Colorspace {
        COLORSPACE_REC_601_525 = 1,
        COLORSPACE_REC_601_625 = 2,
        COLORSPACE_XYZ = 3,  // Mostly useful for testing and debugging.
+       COLORSPACE_REC_2020 = 4,
 };
 
 enum GammaCurve {
@@ -26,11 +33,14 @@ enum GammaCurve {
        GAMMA_sRGB = 1,
        GAMMA_REC_601 = 2,
        GAMMA_REC_709 = 2,  // Same as Rec. 601.
+       GAMMA_REC_2020_10_BIT = 2,  // Same as Rec. 601.
+       GAMMA_REC_2020_12_BIT = 3,
 };
 
 enum YCbCrLumaCoefficients {
        YCBCR_REC_601 = 0,
        YCBCR_REC_709 = 1,
+       YCBCR_REC_2020 = 2,
 };
 
 struct ImageFormat {