avformat/au: Write MetaData in AU Sun audio file header

[ffmpeg] / libavutil / color_utils.c

diff --git a/libavutil/color_utils.c b/libavutil/color_utils.c
index 63f2230980020aca9ac7045f39ee32f606a2c475..eb8bc7b5fc0df1f9f433280ce17e9cb4f1bffa86 100644 (file)
--- 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: