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genweights.py
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genweights.py
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#!/usr/bin/env python3
# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify,
# merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
# PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import sys
FIX16 = 16
FIX18 = 18
FIX16_HALF = (1 << (FIX16 - 1))
FIX_8_14 = 14
FIX_8_14_HALF = (1 << (FIX_8_14 - 1))
FIX16_MULT = (1 << FIX16)
FIX8_14_MULT = (1 << FIX_8_14)
FULL_RANGE = 255
RGB_SRC = [
[
[161, 24, 44, 58],
[35, 95, 51, 205],
[177, 30, 252, 158],
[248, 94, 62, 28],
[247, 51, 135, 38],
[98, 147, 200, 127],
[68, 103, 20, 124],
[233, 227, 165, 0],
],
[
[251, 19, 32, 170],
[235, 183, 25, 77],
[146, 81, 218, 161],
[25, 124, 96, 56],
[22, 127, 167, 179],
[247, 34, 40, 53],
[164, 193, 159, 24],
[96, 158, 17, 223],
],
[
[240, 123, 14, 108],
[0, 105, 52, 116],
[194, 219, 244, 47],
[216, 254, 153, 84],
[116, 77, 133, 68],
[190, 96, 190, 133],
[118, 4, 170, 115],
[218, 145, 23, 50],
],
[
[202, 120, 126, 231],
[42, 28, 137, 40],
[136, 227, 210, 177],
[254, 140, 238, 88],
[90, 195, 170, 67],
[125, 242, 148, 88],
[1, 91, 190, 245],
[31, 100, 190, 225],
],
[
[207, 49, 249, 131],
[48, 120, 34, 82],
[43, 145, 253, 141],
[83, 205, 105, 44],
[16, 9, 157, 22],
[253, 131, 178, 148],
[142, 236, 98, 6],
[246, 190, 15, 213],
],
[
[72, 207, 6, 168],
[220, 39, 6, 219],
[244, 14, 252, 45],
[159, 106, 17, 184],
[222, 72, 230, 39],
[6, 185, 30, 35],
[101, 223, 30, 14],
[40, 71, 16, 244],
],
[
[124, 121, 46, 190],
[244, 206, 61, 169],
[43, 130, 87, 247],
[170, 10, 238, 229],
[12, 168, 14, 220],
[96, 60, 226, 235],
[206, 93, 122, 117],
[126, 168, 203, 39],
],
[
[181, 88, 248, 45],
[65, 24, 208, 166],
[24, 21, 151, 85],
[60, 86, 9, 153],
[225, 80, 156, 159],
[210, 181, 6, 214],
[17, 142, 255, 163],
[189, 137, 72, 87],
],
]
def max_y_error(xr, xg, xb, ar, ag, ab, y_min):
err = 0.0
shift = (y_min << FIX16) + (1 << (FIX16 - 1))
for red in range(256):
y_tmp = xr * red + shift
yf_tmp = ar * red + y_min
for green in range(256):
y_tmp2 = xg * green + y_tmp
yf_tmp2 = ag * green + yf_tmp
for blue in range(256):
y = (xb * blue + y_tmp2) >> FIX16
yf = ab * blue + yf_tmp2
err = max(err, abs(yf - y))
return err
def max_uv_error(yr, yg, zg, br, bg, bb, cr, cg, cb):
yb = -(yr + yg)
zr = yb
zb = -(zr + zg)
shift = (128 << FIX16) + (1 << (FIX16 - 1)) - 1
u_err = 0.0
v_err = 0.0
for red in range(256):
u_tmp = yr * red + shift
v_tmp = zr * red + shift
uf_tmp = br * red + 128
vf_tmp = cr * red + 128
for green in range(256):
u_tmp2 = yg * green + u_tmp
v_tmp2 = zg * green + v_tmp
uf_tmp2 = bg * green + uf_tmp
vf_tmp2 = cg * green + vf_tmp
for blue in range(256):
u = (yb * blue + u_tmp2) >> FIX16
v = (zb * blue + v_tmp2) >> FIX16
uf = bb * blue + uf_tmp2
vf = cb * blue + vf_tmp2
u_err = max(u_err, abs(uf - u))
v_err = max(v_err, abs(vf - v))
return (u_err, v_err)
if __name__ == '__main__':
if len(sys.argv) < 3:
print('usage: python genweights.py [601|709] [0|1]')
exit(0)
model = int(sys.argv[1])
full_range = int(sys.argv[2]) == 1
if model == 601:
kr = 0.299
kg = 0.587
kb = 0.114
elif model == 709:
kr = 0.2126
kg = 0.7152
kb = 0.0722
else:
print('Invalid model %s' % sys.argv[1])
exit(0)
print('Model: %d' % model)
print('Full range: %d' % full_range)
print('')
if full_range:
Y_MIN = 0
Y_MAX = 255
C_MIN = 0
C_MAX = 255
SUFFIX = "FR"
else:
Y_MIN = 16
Y_MAX = 235
C_MIN = 16
C_MAX = 240
SUFFIX = ""
Y_RANGE = Y_MAX - Y_MIN
C_HALF = (C_MAX + C_MIN) >> 1
C_RANGE = C_MAX - C_MIN
Y_SCALE = (Y_RANGE / FULL_RANGE)
C_SCALE = (C_RANGE / FULL_RANGE)
# Forward transformation
ar = kr
ag = kg
ab = kb
br = (-kr / (2.0 * (1.0 - kb)))
bg = (-kg / (2.0 * (1.0 - kb)))
bb = 0.5
cr = 0.5
cg = (-kg / (2.0 * (1.0 - kr)))
cb = (-kb / (2.0 * (1.0 - kr)))
if not full_range:
ar *= Y_SCALE
ag *= Y_SCALE
ab *= Y_SCALE
br *= C_SCALE
bg *= C_SCALE
bb *= C_SCALE
cr *= C_SCALE
cg *= C_SCALE
cb *= C_SCALE
xr = round(FIX16_MULT * ar)
xg = round(FIX16_MULT * ag)
xb = round(FIX16_MULT * ab)
y_err = max_y_error(xr, xg, xb, ar, ag, ab, Y_MIN)
yr = round(FIX16_MULT * br)
yg = round(FIX16_MULT * bg)
zg = round(FIX16_MULT * cg)
diff = -32767 - (yr + yg)
if diff > 0:
# Prevent overflow
# (decide which variable between yr and yg should be incremented)
uv_err = max_uv_error(yr + diff, yg,
zg, br, bg, bb, cr, cg, cb)
uv2_err = max_uv_error(yr, yg + diff, zg,
br, bg, bb, cr, cg, cb)
if max(*uv_err) <= max(*uv2_err):
yr += diff
else:
yg += diff
uv_err = uv2_err
else:
uv_err = max_uv_error(yr, yg, zg, br, bg, bb, cr, cg, cb)
print('Error: y=%.5f, u=%.5f, v=%.5f' % (y_err, *uv_err))
print('')
print('// Coefficient table for %s%s' %
(model, " (full range)" if full_range else ""))
print('pub const XR_%d%s: i32 = %d;' % (model, SUFFIX, xr))
print('pub const XG_%d%s: i32 = %d;' % (model, SUFFIX, xg))
print('pub const XB_%d%s: i32 = %d;' % (model, SUFFIX, xb))
print('pub const YR_%d%s: i32 = %d;' % (model, SUFFIX, yr))
print('pub const YG_%d%s: i32 = %d;' % (model, SUFFIX, yg))
print('pub const ZG_%d%s: i32 = %d;' % (model, SUFFIX, zg))
print('')
# Inverse transformation
ikb = 1.0 - kb
ikr = 1.0 - kr
y_scale = 1 / Y_SCALE
rz = 2.0 * ikr / C_SCALE
gy = (2.0 * ikb * kb) / (C_SCALE * kg)
gz = (2.0 * ikr * kr) / (C_SCALE * kg)
by = 2.0 * ikb / C_SCALE
s = int(FIX8_14_MULT * y_scale + 0.5)
rz = int(FIX8_14_MULT * rz + 0.5)
gy = int(FIX8_14_MULT * gy + 0.5)
gz = int(FIX8_14_MULT * gz + 0.5)
by = int(FIX8_14_MULT * by + 0.5)
rw = rz * C_HALF + s * Y_MIN - FIX_8_14_HALF
gw = (gy * C_HALF) + (gz * C_HALF) - (s * Y_MIN) + FIX_8_14_HALF
bw = s * Y_MIN + by * C_HALF - FIX_8_14_HALF
print('pub const XXYM_%d%s: i32 = %d;' % (model, SUFFIX, s))
print('pub const RCRM_%d%s: i32 = %d;' % (model, SUFFIX, rz))
print('pub const GCRM_%d%s: i32 = %d;' % (model, SUFFIX, gz))
print('pub const GCBM_%d%s: i32 = %d;' % (model, SUFFIX, gy))
print('pub const BCBM_%d%s: i32 = %d;' % (model, SUFFIX, by))
print('pub const RN_%d%s: i32 = %d;' % (model, SUFFIX, rw >> 8))
print('pub const GP_%d%s: i32 = %d;' % (model, SUFFIX, gw >> 8))
print('pub const BN_%d%s: i32 = %d;' % (model, SUFFIX, bw >> 8))
# Reference data for regression tests
yb = -(yr + yg)
zr = yb
zb = -(zr + zg)
uv_shift = (128 << FIX16) + (1 << (FIX16 - 1)) - 1
uv2_shift = (128 << FIX18) + (1 << (FIX18 - 1)) - 1
y_shift = (Y_MIN << FIX16) + (1 << (FIX16 - 1))
print('const Y_BT%d%s_REF: &[&[u8]] = &[' % (model, SUFFIX))
for row in RGB_SRC:
ys = [(xr * r + xg * g + xb * b + y_shift) >> FIX16
for [r, g, b, a] in row]
print(' &%s,' % ys)
print('];\n')
print('const CB_BT%d%s_REF: &[&[u8]] = &[' % (model, SUFFIX))
for row in RGB_SRC:
us = [(yr * r + yg * g + yb * b + uv_shift) >> FIX16
for [r, g, b, a] in row]
print(' &%s,' % us)
print('];\n')
print('const CR_BT%d%s_REF: &[&[u8]] = &[' % (model, SUFFIX))
for row in RGB_SRC:
vs = [(zr * r + zg * g + zb * b + uv_shift) >> FIX16
for [r, g, b, a] in row]
print(' &%s,' % vs)
print('];\n')
# The same but subsampled
print('const CB2_BT%d%s_REF: &[&[u8]] = &[' % (model, SUFFIX))
for j in range(4):
us = []
for i in range(4):
ii = 2 * i
ij = 2 * j
r = RGB_SRC[ij][ii][0] + RGB_SRC[ij + 1][ii][0] + \
RGB_SRC[ij][ii + 1][0] + RGB_SRC[ij + 1][ii + 1][0]
g = RGB_SRC[ij][ii][1] + RGB_SRC[ij + 1][ii][1] + \
RGB_SRC[ij][ii + 1][1] + RGB_SRC[ij + 1][ii + 1][1]
b = RGB_SRC[ij][ii][2] + RGB_SRC[ij + 1][ii][2] + \
RGB_SRC[ij][ii + 1][2] + RGB_SRC[ij + 1][ii + 1][2]
us.append((yr * r + yg * g + yb * b + uv2_shift) >> FIX18)
print(' &%s,' % us)
print('];\n')
print('const CR2_BT%d%s_REF: &[&[u8]] = &[' % (model, SUFFIX))
for j in range(4):
us = []
for i in range(4):
ii = 2 * i
ij = 2 * j
r = RGB_SRC[ij][ii][0] + RGB_SRC[ij + 1][ii][0] + \
RGB_SRC[ij][ii + 1][0] + RGB_SRC[ij + 1][ii + 1][0]
g = RGB_SRC[ij][ii][1] + RGB_SRC[ij + 1][ii][1] + \
RGB_SRC[ij][ii + 1][1] + RGB_SRC[ij + 1][ii + 1][1]
b = RGB_SRC[ij][ii][2] + RGB_SRC[ij + 1][ii][2] + \
RGB_SRC[ij][ii + 1][2] + RGB_SRC[ij + 1][ii + 1][2]
us.append((zr * r + zg * g + zb * b + uv2_shift) >> FIX18)
print(' &%s,' % us)
print('];')