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| author | Niklas Haas <git@haasn.xyz> | 2020-05-17 03:17:28 +0200 |
|---|---|---|
| committer | Niklas Haas <git@haasn.xyz> | 2020-06-15 01:24:04 +0200 |
| commit | ef6bc8504a945eb6492b8ed46fd5a1afaaf32182 (patch) | |
| tree | 31a0beaa61c89e4e0dacec9e0cd52c559a9b84fc /video/csputils.h | |
| parent | c7fe4ae73ad5f073bbffe3e8a3460b728e7d0f46 (diff) | |
| download | mpv-ef6bc8504a945eb6492b8ed46fd5a1afaaf32182.tar.bz2 mpv-ef6bc8504a945eb6492b8ed46fd5a1afaaf32182.tar.xz | |
vo_gpu: reinterpret SDR white levels based on ITU-R BT.2408
This standard says we should use a value of 203 nits instead of 100 for
mapping between SDR and HDR.
Code copied from https://code.videolan.org/videolan/libplacebo/-/commit/9d9164773
In particular, that commit also includes a test case to make sure the
implementation doesn't break roundtrips.
Relevant to #4248 and #7357.
Diffstat (limited to 'video/csputils.h')
| -rw-r--r-- | video/csputils.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/video/csputils.h b/video/csputils.h index 34e2894a28..965c313a02 100644 --- a/video/csputils.h +++ b/video/csputils.h @@ -145,9 +145,11 @@ struct mp_colorspace { // For many colorspace conversions, in particular those involving HDR, an // implicit reference white level is needed. Since this magic constant shows up -// a lot, give it an explicit name. The value of 100 cd/m² comes from ITU-R -// documents such as ITU-R BT.2100 -#define MP_REF_WHITE 100.0 +// a lot, give it an explicit name. The value of 203 cd/m² comes from ITU-R +// Report BT.2408, and the value for HLG comes from the cited HLG 75% level +// (transferred to scene space). +#define MP_REF_WHITE 203.0 +#define MP_REF_WHITE_HLG 3.17955 // Replaces unknown values in the first struct by those of the second struct void mp_colorspace_merge(struct mp_colorspace *orig, struct mp_colorspace *new); |