diff options
Diffstat (limited to 'libavutil/color_utils.c')
| -rw-r--r-- | libavutil/color_utils.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/libavutil/color_utils.c b/libavutil/color_utils.c index 63f2230980..eb8bc7b5fc 100644 --- a/libavutil/color_utils.c +++ b/libavutil/color_utils.c @@ -155,6 +155,18 @@ static double avpriv_trc_smpte_st428_1(double Lc) : pow(48.0 * Lc / 52.37, 1.0 / 2.6); } + +static double avpriv_trc_arib_std_b67(double Lc) { + // The function uses the definition from HEVC, which assumes that the peak + // white is input level = 1. (this is equivalent to scaling E = Lc * 12 and + // using the definition from the ARIB STD-B67 spec) + const double a = 0.17883277; + const double b = 0.28466892; + const double c = 0.55991073; + return (0.0 > Lc) ? 0.0 : + (Lc <= 1.0 / 12.0 ? sqrt(3.0 * Lc) : a * log(12.0 * Lc - b) + c); +} + avpriv_trc_function avpriv_get_trc_function_from_trc(enum AVColorTransferCharacteristic trc) { avpriv_trc_function func = NULL; @@ -209,6 +221,10 @@ avpriv_trc_function avpriv_get_trc_function_from_trc(enum AVColorTransferCharact func = avpriv_trc_smpte_st428_1; break; + case AVCOL_TRC_ARIB_STD_B67: + func = avpriv_trc_arib_std_b67; + break; + case AVCOL_TRC_RESERVED0: case AVCOL_TRC_UNSPECIFIED: case AVCOL_TRC_RESERVED: |