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libobs: Cap HLG video at 1000 nits

master
jpark37 2022-05-14 00:05:01 -07:00 committed by Jim
parent d7fb4361a5
commit 8909e44870
1 changed files with 8 additions and 7 deletions
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15
libobs/obs-source.c
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@ -2258,17 +2258,18 @@ static bool update_async_texrender(struct obs_source *source,
set_eparam(conv, "height_d2", (float)cy * 0.5f);
set_eparam(conv, "width_x2_i", 0.5f / (float)cx);
const float hdr_nominal_peak_level =
obs->video.hdr_nominal_peak_level;
/* BT.2408 says higher than 1000 isn't comfortable */
float hlg_peak_level = obs->video.hdr_nominal_peak_level;
if (hlg_peak_level > 1000.f)
hlg_peak_level = 1000.f;
const float maximum_nits = (frame->trc == VIDEO_TRC_HLG)
? hdr_nominal_peak_level
? hlg_peak_level
: 10000.f;
set_eparam(conv, "maximum_over_sdr_white_nits",
maximum_nits / obs_get_video_sdr_white_level());
const float hlg_gamma =
1.2f +
(0.42f * log10f(hdr_nominal_peak_level / 1000.f));
const float hlg_exponent = hlg_gamma - 1.f;
const float hlg_exponent =
0.2f + (0.42f * log10f(hlg_peak_level / 1000.f));
set_eparam(conv, "hlg_exponent", hlg_exponent);
struct vec4 vec0, vec1, vec2;