Add 3dl export

Author: mfe

utils/threedl_helper.py

@@ -0,0 +1,47 @@
+""" 3dl (3D LUT) helpers
+
+.. moduleauthor:: `Marie FETIVEAU <github.com/mfe>`_
+
+"""
+import math
+
+
+class ThreeDLHelperException(Exception):
+    pass
+
+
+def get_shaper_lut(cube_size, bit_depth):
+    """ Return shaper lut as a list
+
+    Args:
+        cube_size (int): cube size. Ex: 17, 32...
+
+        bit_depth (int): bit depth of shaper lut values. Ex: 10, 12, 16...
+
+    Returns:
+        .int list
+
+    """
+    max_value = float(math.pow(2, bit_depth) - 1)
+    step = max_value / (cube_size - 1)
+    shaper_lut = []
+    for i in range(0, cube_size):
+        shaper_lut.append(int(i*step))
+    return shaper_lut
+
+
+def get_string_shaper_lut(cube_size, bit_depth):
+    """ Return shaper lut as a string
+
+    Args:
+        cube_size (int): cube size. Ex: 17, 32...
+
+        bit_depth (int): bit depth of the value of the shaper lut. Ex: 10, 12,
+        16...
+
+    Returns:
+        .string list
+
+    """
+    shaper_lut = get_shaper_lut(cube_size, bit_depth)
+    return "{0}".format(" ".join(map(str, shaper_lut)))