[vlc-devel] [PATCH 2/5] direct3d11: document the pixel conversion matrices

[Steve Lhomme]

---
 modules/video_output/win32/direct3d11.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/modules/video_output/win32/direct3d11.c b/modules/video_output/win32/direct3d11.c
index 3ffba3d735..5506b9feba 100644
--- a/modules/video_output/win32/direct3d11.c
+++ b/modules/video_output/win32/direct3d11.c
@@ -2193,19 +2193,23 @@ static int SetupQuad(vout_display_t *vd, const video_format_t *fmt, d3d_quad_t *
         0.f, 0.f, 1.f, 0.f,
         0.f, 0.f, 0.f, 1.f,
     };
+
+    /* matrices for studio range */
+    /* see https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion, in studio range */
     static const FLOAT COLORSPACE_BT601_TO_FULL[4*4] = {
         1.164383561643836f,                 0.f,  1.596026785714286f, 0.f,
         1.164383561643836f, -0.391762290094914f, -0.812967647237771f, 0.f,
         1.164383561643836f,  2.017232142857142f,                 0.f, 0.f,
                        0.f,                 0.f,                 0.f, 1.f,
     };
+    /* see https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.709_conversion, in studio range */
     static const FLOAT COLORSPACE_BT709_TO_FULL[4*4] = {
         1.164383561643836f,                 0.f,  1.792741071428571f, 0.f,
         1.164383561643836f, -0.213248614273730f, -0.532909328559444f, 0.f,
         1.164383561643836f,  2.112401785714286f,                 0.f, 0.f,
                        0.f,                 0.f,                 0.f, 1.f,
     };
-    /* RGB-709 to RGB-2020 based on https://www.researchgate.net/publication/258434326_Beyond_BT709 */
+    /* see https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.2020_conversion, in studio range */
     static const FLOAT COLORSPACE_BT2020_TO_FULL[4*4] = {
         1.163746465f, -0.028815145f,  2.823537589f, 0.f,
         1.164383561f, -0.258509894f,  0.379693635f, 0.f,
-- 
2.11.1