[vlc-devel] [PATCH] direct3d11: adjust the max luminance when tone mapping to SDR

[Steve Lhomme]

The content never reaches 10000 nits also the max luminance in files is often
bogus, HDR TVs don't actually use them but use a hardcoded value instead.

When the display is in HDR mode, let it deal with the luminance. Otherwise
use a value of 5000 that gives a good result with most HDR10 content.
---
 modules/video_output/win32/direct3d11.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/modules/video_output/win32/direct3d11.c b/modules/video_output/win32/direct3d11.c
index f2e683466e..2ff3040422 100644
--- a/modules/video_output/win32/direct3d11.c
+++ b/modules/video_output/win32/direct3d11.c
@@ -1777,8 +1777,12 @@ static HRESULT CompilePixelShader(vout_display_t *vd, const d3d_format_t *format
     switch (transfer)
     {
         case TRANSFER_FUNC_SMPTE_ST2084:
-            /* TODO ajust this value using HDR metadata ? */
-            src_luminance_peak = MAX_PQ_BRIGHTNESS;
+            if (sys->display.colorspace->transfer == TRANSFER_FUNC_SMPTE_ST2084)
+                /* the display will take care of the meta data if there are some */
+                src_luminance_peak = MAX_PQ_BRIGHTNESS;
+            else
+                /* TODO adjust this value during playback using HDR metadata ? */
+                src_luminance_peak = 5000;
             break;
         case TRANSFER_FUNC_HLG:
             src_luminance_peak = 1000;
-- 
2.14.2