upstream-rocketchat/packages/mp3-encoder/src/lame/NewMDCT.ts

import type { LameInternalFlags } from './LameInternalFlags';
import { copyArray, fillArray } from './arrays';
import { SHORT_TYPE } from './constants';

export class NewMDCT {
	private readonly enwindow = [
		(-4.77e-7 * 0.740951125354959) / 2.384e-6,
		(1.03951e-4 * 0.740951125354959) / 2.384e-6,
		(9.53674e-4 * 0.740951125354959) / 2.384e-6,
		(2.841473e-3 * 0.740951125354959) / 2.384e-6,
		(3.5758972e-2 * 0.740951125354959) / 2.384e-6,
		(3.401756e-3 * 0.740951125354959) / 2.384e-6,
		(9.83715e-4 * 0.740951125354959) / 2.384e-6,
		(9.9182e-5 * 0.740951125354959) / 2.384e-6,
		(1.2398e-5 * 0.740951125354959) / 2.384e-6,
		(1.91212e-4 * 0.740951125354959) / 2.384e-6,
		(2.283096e-3 * 0.740951125354959) / 2.384e-6,
		(1.6994476e-2 * 0.740951125354959) / 2.384e-6,
		(-1.8756866e-2 * 0.740951125354959) / 2.384e-6,
		(-2.630711e-3 * 0.740951125354959) / 2.384e-6,
		(-2.47478e-4 * 0.740951125354959) / 2.384e-6,
		(-1.4782e-5 * 0.740951125354959) / 2.384e-6,
		9.063471690191471e-1,
		1.960342806591213e-1,

		(-4.77e-7 * 0.773010453362737) / 2.384e-6,
		(1.05858e-4 * 0.773010453362737) / 2.384e-6,
		(9.30786e-4 * 0.773010453362737) / 2.384e-6,
		(2.521515e-3 * 0.773010453362737) / 2.384e-6,
		(3.5694122e-2 * 0.773010453362737) / 2.384e-6,
		(3.643036e-3 * 0.773010453362737) / 2.384e-6,
		(9.91821e-4 * 0.773010453362737) / 2.384e-6,
		(9.6321e-5 * 0.773010453362737) / 2.384e-6,
		(1.1444e-5 * 0.773010453362737) / 2.384e-6,
		(1.65462e-4 * 0.773010453362737) / 2.384e-6,
		(2.110004e-3 * 0.773010453362737) / 2.384e-6,
		(1.6112804e-2 * 0.773010453362737) / 2.384e-6,
		(-1.9634247e-2 * 0.773010453362737) / 2.384e-6,
		(-2.803326e-3 * 0.773010453362737) / 2.384e-6,
		(-2.77042e-4 * 0.773010453362737) / 2.384e-6,
		(-1.6689e-5 * 0.773010453362737) / 2.384e-6,
		8.206787908286602e-1,
		3.901806440322567e-1,

		(-4.77e-7 * 0.803207531480645) / 2.384e-6,
		(1.07288e-4 * 0.803207531480645) / 2.384e-6,
		(9.02653e-4 * 0.803207531480645) / 2.384e-6,
		(2.174854e-3 * 0.803207531480645) / 2.384e-6,
		(3.5586357e-2 * 0.803207531480645) / 2.384e-6,
		(3.858566e-3 * 0.803207531480645) / 2.384e-6,
		(9.95159e-4 * 0.803207531480645) / 2.384e-6,
		(9.346e-5 * 0.803207531480645) / 2.384e-6,
		(1.0014e-5 * 0.803207531480645) / 2.384e-6,
		(1.4019e-4 * 0.803207531480645) / 2.384e-6,
		(1.937389e-3 * 0.803207531480645) / 2.384e-6,
		(1.5233517e-2 * 0.803207531480645) / 2.384e-6,
		(-2.0506859e-2 * 0.803207531480645) / 2.384e-6,
		(-2.974033e-3 * 0.803207531480645) / 2.384e-6,
		(-3.0756e-4 * 0.803207531480645) / 2.384e-6,
		(-1.812e-5 * 0.803207531480645) / 2.384e-6,
		7.416505462720353e-1,
		5.805693545089249e-1,

		(-4.77e-7 * 0.831469612302545) / 2.384e-6,
		(1.08242e-4 * 0.831469612302545) / 2.384e-6,
		(8.68797e-4 * 0.831469612302545) / 2.384e-6,
		(1.800537e-3 * 0.831469612302545) / 2.384e-6,
		(3.54352e-2 * 0.831469612302545) / 2.384e-6,
		(4.049301e-3 * 0.831469612302545) / 2.384e-6,
		(9.94205e-4 * 0.831469612302545) / 2.384e-6,
		(9.0599e-5 * 0.831469612302545) / 2.384e-6,
		(9.06e-6 * 0.831469612302545) / 2.384e-6,
		(1.16348e-4 * 0.831469612302545) / 2.384e-6,
		(1.766682e-3 * 0.831469612302545) / 2.384e-6,
		(1.4358521e-2 * 0.831469612302545) / 2.384e-6,
		(-2.1372318e-2 * 0.831469612302545) / 2.384e-6,
		(-3.14188e-3 * 0.831469612302545) / 2.384e-6,
		(-3.39031e-4 * 0.831469612302545) / 2.384e-6,
		(-1.955e-5 * 0.831469612302545) / 2.384e-6,
		6.681786379192989e-1,
		7.653668647301797e-1,

		(-4.77e-7 * 0.857728610000272) / 2.384e-6,
		(1.08719e-4 * 0.857728610000272) / 2.384e-6,
		(8.2922e-4 * 0.857728610000272) / 2.384e-6,
		(1.399517e-3 * 0.857728610000272) / 2.384e-6,
		(3.5242081e-2 * 0.857728610000272) / 2.384e-6,
		(4.21524e-3 * 0.857728610000272) / 2.384e-6,
		(9.89437e-4 * 0.857728610000272) / 2.384e-6,
		(8.7261e-5 * 0.857728610000272) / 2.384e-6,
		(8.106e-6 * 0.857728610000272) / 2.384e-6,
		(9.3937e-5 * 0.857728610000272) / 2.384e-6,
		(1.597881e-3 * 0.857728610000272) / 2.384e-6,
		(1.3489246e-2 * 0.857728610000272) / 2.384e-6,
		(-2.2228718e-2 * 0.857728610000272) / 2.384e-6,
		(-3.306866e-3 * 0.857728610000272) / 2.384e-6,
		(-3.71456e-4 * 0.857728610000272) / 2.384e-6,
		(-2.1458e-5 * 0.857728610000272) / 2.384e-6,
		5.993769336819237e-1,
		9.427934736519954e-1,

		(-4.77e-7 * 0.881921264348355) / 2.384e-6,
		(1.08719e-4 * 0.881921264348355) / 2.384e-6,
		(7.8392e-4 * 0.881921264348355) / 2.384e-6,
		(9.71317e-4 * 0.881921264348355) / 2.384e-6,
		(3.5007e-2 * 0.881921264348355) / 2.384e-6,
		(4.357815e-3 * 0.881921264348355) / 2.384e-6,
		(9.80854e-4 * 0.881921264348355) / 2.384e-6,
		(8.3923e-5 * 0.881921264348355) / 2.384e-6,
		(7.629e-6 * 0.881921264348355) / 2.384e-6,
		(7.2956e-5 * 0.881921264348355) / 2.384e-6,
		(1.432419e-3 * 0.881921264348355) / 2.384e-6,
		(1.2627602e-2 * 0.881921264348355) / 2.384e-6,
		(-2.307415e-2 * 0.881921264348355) / 2.384e-6,
		(-3.467083e-3 * 0.881921264348355) / 2.384e-6,
		(-4.04358e-4 * 0.881921264348355) / 2.384e-6,
		(-2.3365e-5 * 0.881921264348355) / 2.384e-6,
		5.345111359507916e-1,
		1.111140466039205,

		(-9.54e-7 * 0.903989293123443) / 2.384e-6,
		(1.08242e-4 * 0.903989293123443) / 2.384e-6,
		(7.31945e-4 * 0.903989293123443) / 2.384e-6,
		(5.15938e-4 * 0.903989293123443) / 2.384e-6,
		(3.4730434e-2 * 0.903989293123443) / 2.384e-6,
		(4.477024e-3 * 0.903989293123443) / 2.384e-6,
		(9.68933e-4 * 0.903989293123443) / 2.384e-6,
		(8.0585e-5 * 0.903989293123443) / 2.384e-6,
		(6.676e-6 * 0.903989293123443) / 2.384e-6,
		(5.2929e-5 * 0.903989293123443) / 2.384e-6,
		(1.269817e-3 * 0.903989293123443) / 2.384e-6,
		(1.1775017e-2 * 0.903989293123443) / 2.384e-6,
		(-2.3907185e-2 * 0.903989293123443) / 2.384e-6,
		(-3.622532e-3 * 0.903989293123443) / 2.384e-6,
		(-4.38213e-4 * 0.903989293123443) / 2.384e-6,
		(-2.5272e-5 * 0.903989293123443) / 2.384e-6,
		4.729647758913199e-1,
		1.268786568327291,

		(-9.54e-7 * 0.9238795325112867) / 2.384e-6,
		(1.06812e-4 * 0.9238795325112867) / 2.384e-6,
		(6.74248e-4 * 0.9238795325112867) / 2.384e-6,
		(3.3379e-5 * 0.9238795325112867) / 2.384e-6,
		(3.4412861e-2 * 0.9238795325112867) / 2.384e-6,
		(4.573822e-3 * 0.9238795325112867) / 2.384e-6,
		(9.54151e-4 * 0.9238795325112867) / 2.384e-6,
		(7.6771e-5 * 0.9238795325112867) / 2.384e-6,
		(6.199e-6 * 0.9238795325112867) / 2.384e-6,
		(3.4332e-5 * 0.9238795325112867) / 2.384e-6,
		(1.111031e-3 * 0.9238795325112867) / 2.384e-6,
		(1.0933399e-2 * 0.9238795325112867) / 2.384e-6,
		(-2.4725437e-2 * 0.9238795325112867) / 2.384e-6,
		(-3.771782e-3 * 0.9238795325112867) / 2.384e-6,
		(-4.72546e-4 * 0.9238795325112867) / 2.384e-6,
		(-2.7657e-5 * 0.9238795325112867) / 2.384e-6,
		0.41421356237309503,
		1.414213562373095,

		(-9.54e-7 * 0.941544065183021) / 2.384e-6,
		(1.05381e-4 * 0.941544065183021) / 2.384e-6,
		(6.10352e-4 * 0.941544065183021) / 2.384e-6,
		(-4.75883e-4 * 0.941544065183021) / 2.384e-6,
		(3.405571e-2 * 0.941544065183021) / 2.384e-6,
		(4.649162e-3 * 0.941544065183021) / 2.384e-6,
		(9.35555e-4 * 0.941544065183021) / 2.384e-6,
		(7.3433e-5 * 0.941544065183021) / 2.384e-6,
		(5.245e-6 * 0.941544065183021) / 2.384e-6,
		(1.7166e-5 * 0.941544065183021) / 2.384e-6,
		(9.56535e-4 * 0.941544065183021) / 2.384e-6,
		(1.0103703e-2 * 0.941544065183021) / 2.384e-6,
		(-2.5527e-2 * 0.941544065183021) / 2.384e-6,
		(-3.914356e-3 * 0.941544065183021) / 2.384e-6,
		(-5.07355e-4 * 0.941544065183021) / 2.384e-6,
		(-3.0041e-5 * 0.941544065183021) / 2.384e-6,
		3.578057213145241e-1,
		1.546020906725474,

		(-9.54e-7 * 0.956940335732209) / 2.384e-6,
		(1.0252e-4 * 0.956940335732209) / 2.384e-6,
		(5.39303e-4 * 0.956940335732209) / 2.384e-6,
		(-1.011848e-3 * 0.956940335732209) / 2.384e-6,
		(3.3659935e-2 * 0.956940335732209) / 2.384e-6,
		(4.703045e-3 * 0.956940335732209) / 2.384e-6,
		(9.15051e-4 * 0.956940335732209) / 2.384e-6,
		(7.0095e-5 * 0.956940335732209) / 2.384e-6,
		(4.768e-6 * 0.956940335732209) / 2.384e-6,
		(9.54e-7 * 0.956940335732209) / 2.384e-6,
		(8.06808e-4 * 0.956940335732209) / 2.384e-6,
		(9.287834e-3 * 0.956940335732209) / 2.384e-6,
		(-2.6310921e-2 * 0.956940335732209) / 2.384e-6,
		(-4.048824e-3 * 0.956940335732209) / 2.384e-6,
		(-5.42164e-4 * 0.956940335732209) / 2.384e-6,
		(-3.2425e-5 * 0.956940335732209) / 2.384e-6,
		3.033466836073424e-1,
		1.66293922460509,

		(-1.431e-6 * 0.970031253194544) / 2.384e-6,
		(9.9182e-5 * 0.970031253194544) / 2.384e-6,
		(4.62532e-4 * 0.970031253194544) / 2.384e-6,
		(-1.573563e-3 * 0.970031253194544) / 2.384e-6,
		(3.3225536e-2 * 0.970031253194544) / 2.384e-6,
		(4.737377e-3 * 0.970031253194544) / 2.384e-6,
		(8.91685e-4 * 0.970031253194544) / 2.384e-6,
		(6.628e-5 * 0.970031253194544) / 2.384e-6,
		(4.292e-6 * 0.970031253194544) / 2.384e-6,
		(-1.3828e-5 * 0.970031253194544) / 2.384e-6,
		(6.6185e-4 * 0.970031253194544) / 2.384e-6,
		(8.487225e-3 * 0.970031253194544) / 2.384e-6,
		(-2.707386e-2 * 0.970031253194544) / 2.384e-6,
		(-4.174709e-3 * 0.970031253194544) / 2.384e-6,
		(-5.76973e-4 * 0.970031253194544) / 2.384e-6,
		(-3.4809e-5 * 0.970031253194544) / 2.384e-6,
		2.504869601913055e-1,
		1.76384252869671,

		(-1.431e-6 * 0.98078528040323) / 2.384e-6,
		(9.5367e-5 * 0.98078528040323) / 2.384e-6,
		(3.78609e-4 * 0.98078528040323) / 2.384e-6,
		(-2.161503e-3 * 0.98078528040323) / 2.384e-6,
		(3.2754898e-2 * 0.98078528040323) / 2.384e-6,
		(4.752159e-3 * 0.98078528040323) / 2.384e-6,
		(8.66413e-4 * 0.98078528040323) / 2.384e-6,
		(6.2943e-5 * 0.98078528040323) / 2.384e-6,
		(3.815e-6 * 0.98078528040323) / 2.384e-6,
		(-2.718e-5 * 0.98078528040323) / 2.384e-6,
		(5.22137e-4 * 0.98078528040323) / 2.384e-6,
		(7.703304e-3 * 0.98078528040323) / 2.384e-6,
		(-2.7815342e-2 * 0.98078528040323) / 2.384e-6,
		(-4.290581e-3 * 0.98078528040323) / 2.384e-6,
		(-6.11782e-4 * 0.98078528040323) / 2.384e-6,
		(-3.767e-5 * 0.98078528040323) / 2.384e-6,
		1.98912367379658e-1,
		1.847759065022573,

		(-1.907e-6 * 0.989176509964781) / 2.384e-6,
		(9.0122e-5 * 0.989176509964781) / 2.384e-6,
		(2.88486e-4 * 0.989176509964781) / 2.384e-6,
		(-2.774239e-3 * 0.989176509964781) / 2.384e-6,
		(3.224802e-2 * 0.989176509964781) / 2.384e-6,
		(4.748821e-3 * 0.989176509964781) / 2.384e-6,
		(8.38757e-4 * 0.989176509964781) / 2.384e-6,
		(5.9605e-5 * 0.989176509964781) / 2.384e-6,
		(3.338e-6 * 0.989176509964781) / 2.384e-6,
		(-3.9577e-5 * 0.989176509964781) / 2.384e-6,
		(3.88145e-4 * 0.989176509964781) / 2.384e-6,
		(6.937027e-3 * 0.989176509964781) / 2.384e-6,
		(-2.8532982e-2 * 0.989176509964781) / 2.384e-6,
		(-4.395962e-3 * 0.989176509964781) / 2.384e-6,
		(-6.46591e-4 * 0.989176509964781) / 2.384e-6,
		(-4.0531e-5 * 0.989176509964781) / 2.384e-6,
		1.483359875383474e-1,
		1.913880671464418,

		(-1.907e-6 * 0.995184726672197) / 2.384e-6,
		(8.44e-5 * 0.995184726672197) / 2.384e-6,
		(1.91689e-4 * 0.995184726672197) / 2.384e-6,
		(-3.411293e-3 * 0.995184726672197) / 2.384e-6,
		(3.170681e-2 * 0.995184726672197) / 2.384e-6,
		(4.728317e-3 * 0.995184726672197) / 2.384e-6,
		(8.09669e-4 * 0.995184726672197) / 2.384e-6,
		(5.579e-5 * 0.995184726672197) / 2.384e-6,
		(3.338e-6 * 0.995184726672197) / 2.384e-6,
		(-5.0545e-5 * 0.995184726672197) / 2.384e-6,
		(2.59876e-4 * 0.995184726672197) / 2.384e-6,
		(6.189346e-3 * 0.995184726672197) / 2.384e-6,
		(-2.9224873e-2 * 0.995184726672197) / 2.384e-6,
		(-4.489899e-3 * 0.995184726672197) / 2.384e-6,
		(-6.80923e-4 * 0.995184726672197) / 2.384e-6,
		(-4.3392e-5 * 0.995184726672197) / 2.384e-6,
		9.849140335716425e-2,
		1.961570560806461,

		(-2.384e-6 * 0.998795456205172) / 2.384e-6,
		(7.7724e-5 * 0.998795456205172) / 2.384e-6,
		(8.8215e-5 * 0.998795456205172) / 2.384e-6,
		(-4.072189e-3 * 0.998795456205172) / 2.384e-6,
		(3.1132698e-2 * 0.998795456205172) / 2.384e-6,
		(4.691124e-3 * 0.998795456205172) / 2.384e-6,
		(7.79152e-4 * 0.998795456205172) / 2.384e-6,
		(5.2929e-5 * 0.998795456205172) / 2.384e-6,
		(2.861e-6 * 0.998795456205172) / 2.384e-6,
		(-6.0558e-5 * 0.998795456205172) / 2.384e-6,
		(1.37329e-4 * 0.998795456205172) / 2.384e-6,
		(5.46217e-3 * 0.998795456205172) / 2.384e-6,
		(-2.989006e-2 * 0.998795456205172) / 2.384e-6,
		(-4.570484e-3 * 0.998795456205172) / 2.384e-6,
		(-7.14302e-4 * 0.998795456205172) / 2.384e-6,
		(-4.6253e-5 * 0.998795456205172) / 2.384e-6,
		4.912684976946725e-2,
		1.990369453344394,

		(3.5780907e-2 * Math.SQRT2 * 0.5) / 2.384e-6,
		(1.7876148e-2 * Math.SQRT2 * 0.5) / 2.384e-6,
		(3.134727e-3 * Math.SQRT2 * 0.5) / 2.384e-6,
		(2.457142e-3 * Math.SQRT2 * 0.5) / 2.384e-6,
		(9.71317e-4 * Math.SQRT2 * 0.5) / 2.384e-6,
		(2.18868e-4 * Math.SQRT2 * 0.5) / 2.384e-6,
		(1.01566e-4 * Math.SQRT2 * 0.5) / 2.384e-6,
		(1.3828e-5 * Math.SQRT2 * 0.5) / 2.384e-6,

		3.0526638e-2 / 2.384e-6,
		4.638195e-3 / 2.384e-6,
		7.47204e-4 / 2.384e-6,
		4.9591e-5 / 2.384e-6,
		4.756451e-3 / 2.384e-6,
		2.1458e-5 / 2.384e-6,
		-6.9618e-5 / 2.384e-6,
	] as const;

	private static readonly NS = 12;

	private static readonly NL = 36;

	private readonly win = [
		[
			2.382191739347913e-13, 6.423305872147834e-13, 9.400849094049688e-13, 1.122435026096556e-12, 1.183840321267481e-12,
			1.122435026096556e-12, 9.40084909404969e-13, 6.423305872147839e-13, 2.382191739347918e-13,

			5.456116108943412e-12, 4.878985199565852e-12, 4.240448995017367e-12, 3.559909094758252e-12, 2.858043359288075e-12,
			2.156177623817898e-12, 1.475637723558783e-12, 8.371015190102974e-13, 2.599706096327376e-13,

			-5.456116108943412e-12, -4.878985199565852e-12, -4.240448995017367e-12, -3.559909094758252e-12, -2.858043359288076e-12,
			-2.156177623817898e-12, -1.475637723558783e-12, -8.371015190102975e-13, -2.599706096327376e-13,

			-2.382191739347923e-13, -6.423305872147843e-13, -9.400849094049696e-13, -1.122435026096556e-12, -1.183840321267481e-12,
			-1.122435026096556e-12, -9.400849094049694e-13, -6.42330587214784e-13, -2.382191739347918e-13,
		],
		[
			2.382191739347913e-13, 6.423305872147834e-13, 9.400849094049688e-13, 1.122435026096556e-12, 1.183840321267481e-12,
			1.122435026096556e-12, 9.400849094049688e-13, 6.423305872147841e-13, 2.382191739347918e-13,

			5.456116108943413e-12, 4.878985199565852e-12, 4.240448995017367e-12, 3.559909094758253e-12, 2.858043359288075e-12,
			2.156177623817898e-12, 1.475637723558782e-12, 8.371015190102975e-13, 2.599706096327376e-13,

			-5.461314069809755e-12, -4.921085770524055e-12, -4.343405037091838e-12, -3.732668368707687e-12, -3.093523840190885e-12,
			-2.430835727329465e-12, -1.734679010007751e-12, -9.748253656609281e-13, -2.797435120168326e-13,

			0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -2.283748241799531e-13, -4.037858874020686e-13, -2.146547464825323e-13,
		],
		[
			1.316524975873958e-1, 4.14213562373095e-1, 7.673269879789602e-1,

			1.091308501069271, 1.303225372841206, 1.56968557711749, 1.920982126971166, 2.414213562373094, 3.171594802363212, 4.510708503662055,
			7.595754112725146, 2.290376554843115e1,

			0.98480775301220802032, 0.64278760968653936292, 0.34202014332566882393, 0.93969262078590842791, -0.17364817766693030343,
			-0.76604444311897790243, 0.86602540378443870761, 0.5,

			-5.144957554275265e-1, -4.717319685649723e-1, -3.133774542039019e-1, -1.819131996109812e-1, -9.457419252642064e-2,
			-4.096558288530405e-2, -1.419856857247115e-2, -3.699974673760037e-3,

			8.574929257125442e-1, 8.817419973177052e-1, 9.496286491027329e-1, 9.833145924917901e-1, 9.955178160675857e-1, 9.991605581781475e-1,
			9.99899195244447e-1, 9.999931550702802e-1,
		],
		[
			0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 2.283748241799531e-13, 4.037858874020686e-13, 2.146547464825323e-13,

			5.461314069809755e-12, 4.921085770524055e-12, 4.343405037091838e-12, 3.732668368707687e-12, 3.093523840190885e-12,
			2.430835727329466e-12, 1.734679010007751e-12, 9.748253656609281e-13, 2.797435120168326e-13,

			-5.456116108943413e-12, -4.878985199565852e-12, -4.240448995017367e-12, -3.559909094758253e-12, -2.858043359288075e-12,
			-2.156177623817898e-12, -1.475637723558782e-12, -8.371015190102975e-13, -2.599706096327376e-13,

			-2.382191739347913e-13, -6.423305872147834e-13, -9.400849094049688e-13, -1.122435026096556e-12, -1.183840321267481e-12,
			-1.122435026096556e-12, -9.400849094049688e-13, -6.423305872147841e-13, -2.382191739347918e-13,
		],
	] as const;

	private readonly tantab_l = this.win[SHORT_TYPE];

	private readonly cx = this.win[SHORT_TYPE];

	private readonly ca = this.win[SHORT_TYPE];

	private readonly cs = this.win[SHORT_TYPE];

	private readonly order = [
		0, 1, 16, 17, 8, 9, 24, 25, 4, 5, 20, 21, 12, 13, 28, 29, 2, 3, 18, 19, 10, 11, 26, 27, 6, 7, 22, 23, 14, 15, 30, 31,
	] as const;

	private window_subband(x1: Float32Array, x1Pos: number, a: Float32Array) {
		let wp = 10;

		let x2 = x1Pos + 238 - 14 - 286;

		for (let i = -15; i < 0; i++) {
			let w;
			let s;
			let t;

			w = this.enwindow[wp + -10];
			s = x1[x2 + -224] * w;
			t = x1[x1Pos + 224] * w;
			w = this.enwindow[wp + -9];
			s += x1[x2 + -160] * w;
			t += x1[x1Pos + 160] * w;
			w = this.enwindow[wp + -8];
			s += x1[x2 + -96] * w;
			t += x1[x1Pos + 96] * w;
			w = this.enwindow[wp + -7];
			s += x1[x2 + -32] * w;
			t += x1[x1Pos + 32] * w;
			w = this.enwindow[wp + -6];
			s += x1[x2 + 32] * w;
			t += x1[x1Pos + -32] * w;
			w = this.enwindow[wp + -5];
			s += x1[x2 + 96] * w;
			t += x1[x1Pos + -96] * w;
			w = this.enwindow[wp + -4];
			s += x1[x2 + 160] * w;
			t += x1[x1Pos + -160] * w;
			w = this.enwindow[wp + -3];
			s += x1[x2 + 224] * w;
			t += x1[x1Pos + -224] * w;

			w = this.enwindow[wp + -2];
			s += x1[x1Pos + -256] * w;
			t -= x1[x2 + 256] * w;
			w = this.enwindow[wp + -1];
			s += x1[x1Pos + -192] * w;
			t -= x1[x2 + 192] * w;
			w = this.enwindow[wp + 0];
			s += x1[x1Pos + -128] * w;
			t -= x1[x2 + 128] * w;
			w = this.enwindow[wp + 1];
			s += x1[x1Pos + -64] * w;
			t -= x1[x2 + 64] * w;
			w = this.enwindow[wp + 2];
			s += x1[x1Pos + 0] * w;
			t -= x1[x2 + 0] * w;
			w = this.enwindow[wp + 3];
			s += x1[x1Pos + 64] * w;
			t -= x1[x2 + -64] * w;
			w = this.enwindow[wp + 4];
			s += x1[x1Pos + 128] * w;
			t -= x1[x2 + -128] * w;
			w = this.enwindow[wp + 5];
			s += x1[x1Pos + 192] * w;
			t -= x1[x2 + -192] * w;

			s *= this.enwindow[wp + 6];
			w = t - s;
			a[30 + i * 2] = t + s;
			a[31 + i * 2] = this.enwindow[wp + 7] * w;
			wp += 18;
			x1Pos--;
			x2++;
		}

		let s;
		let t;
		t = x1[x1Pos + -16] * this.enwindow[wp + -10];
		s = x1[x1Pos + -32] * this.enwindow[wp + -2];
		t += (x1[x1Pos + -48] - x1[x1Pos + 16]) * this.enwindow[wp + -9];
		s += x1[x1Pos + -96] * this.enwindow[wp + -1];
		t += (x1[x1Pos + -80] + x1[x1Pos + 48]) * this.enwindow[wp + -8];
		s += x1[x1Pos + -160] * this.enwindow[wp + 0];
		t += (x1[x1Pos + -112] - x1[x1Pos + 80]) * this.enwindow[wp + -7];
		s += x1[x1Pos + -224] * this.enwindow[wp + 1];
		t += (x1[x1Pos + -144] + x1[x1Pos + 112]) * this.enwindow[wp + -6];
		s -= x1[x1Pos + 32] * this.enwindow[wp + 2];
		t += (x1[x1Pos + -176] - x1[x1Pos + 144]) * this.enwindow[wp + -5];
		s -= x1[x1Pos + 96] * this.enwindow[wp + 3];
		t += (x1[x1Pos + -208] + x1[x1Pos + 176]) * this.enwindow[wp + -4];
		s -= x1[x1Pos + 160] * this.enwindow[wp + 4];
		t += (x1[x1Pos + -240] - x1[x1Pos + 208]) * this.enwindow[wp + -3];
		s -= x1[x1Pos + 224];

		const u = s - t;
		const v = s + t;

		t = a[14];
		s = a[15] - t;

		a[31] = v + t;
		a[30] = u + s;
		a[15] = u - s;
		a[14] = v - t;

		let xr;
		xr = a[28] - a[0];
		a[0] += a[28];
		a[28] = xr * this.enwindow[wp + -2 * 18 + 7];
		xr = a[29] - a[1];
		a[1] += a[29];
		a[29] = xr * this.enwindow[wp + -2 * 18 + 7];

		xr = a[26] - a[2];
		a[2] += a[26];
		a[26] = xr * this.enwindow[wp + -4 * 18 + 7];
		xr = a[27] - a[3];
		a[3] += a[27];
		a[27] = xr * this.enwindow[wp + -4 * 18 + 7];

		xr = a[24] - a[4];
		a[4] += a[24];
		a[24] = xr * this.enwindow[wp + -6 * 18 + 7];
		xr = a[25] - a[5];
		a[5] += a[25];
		a[25] = xr * this.enwindow[wp + -6 * 18 + 7];

		xr = a[22] - a[6];
		a[6] += a[22];
		a[22] = xr * Math.SQRT2;
		xr = a[23] - a[7];
		a[7] += a[23];
		a[23] = xr * Math.SQRT2 - a[7];
		a[7] -= a[6];
		a[22] -= a[7];
		a[23] -= a[22];

		xr = a[6];
		a[6] = a[31] - xr;
		a[31] += xr;
		xr = a[7];
		a[7] = a[30] - xr;
		a[30] += xr;
		xr = a[22];
		a[22] = a[15] - xr;
		a[15] += xr;
		xr = a[23];
		a[23] = a[14] - xr;
		a[14] += xr;

		xr = a[20] - a[8];
		a[8] += a[20];
		a[20] = xr * this.enwindow[wp + -10 * 18 + 7];
		xr = a[21] - a[9];
		a[9] += a[21];
		a[21] = xr * this.enwindow[wp + -10 * 18 + 7];

		xr = a[18] - a[10];
		a[10] += a[18];
		a[18] = xr * this.enwindow[wp + -12 * 18 + 7];
		xr = a[19] - a[11];
		a[11] += a[19];
		a[19] = xr * this.enwindow[wp + -12 * 18 + 7];

		xr = a[16] - a[12];
		a[12] += a[16];
		a[16] = xr * this.enwindow[wp + -14 * 18 + 7];
		xr = a[17] - a[13];
		a[13] += a[17];
		a[17] = xr * this.enwindow[wp + -14 * 18 + 7];

		xr = -a[20] + a[24];
		a[20] += a[24];
		a[24] = xr * this.enwindow[wp + -12 * 18 + 7];
		xr = -a[21] + a[25];
		a[21] += a[25];
		a[25] = xr * this.enwindow[wp + -12 * 18 + 7];

		xr = a[4] - a[8];
		a[4] += a[8];
		a[8] = xr * this.enwindow[wp + -12 * 18 + 7];
		xr = a[5] - a[9];
		a[5] += a[9];
		a[9] = xr * this.enwindow[wp + -12 * 18 + 7];

		xr = a[0] - a[12];
		a[0] += a[12];
		a[12] = xr * this.enwindow[wp + -4 * 18 + 7];
		xr = a[1] - a[13];
		a[1] += a[13];
		a[13] = xr * this.enwindow[wp + -4 * 18 + 7];
		xr = a[16] - a[28];
		a[16] += a[28];
		a[28] = xr * this.enwindow[wp + -4 * 18 + 7];
		xr = -a[17] + a[29];
		a[17] += a[29];
		a[29] = xr * this.enwindow[wp + -4 * 18 + 7];

		xr = Math.SQRT2 * (a[2] - a[10]);
		a[2] += a[10];
		a[10] = xr;
		xr = Math.SQRT2 * (a[3] - a[11]);
		a[3] += a[11];
		a[11] = xr;
		xr = Math.SQRT2 * (-a[18] + a[26]);
		a[18] += a[26];
		a[26] = xr - a[18];
		xr = Math.SQRT2 * (-a[19] + a[27]);
		a[19] += a[27];
		a[27] = xr - a[19];

		xr = a[2];
		a[19] -= a[3];
		a[3] -= xr;
		a[2] = a[31] - xr;
		a[31] += xr;
		xr = a[3];
		a[11] -= a[19];
		a[18] -= xr;
		a[3] = a[30] - xr;
		a[30] += xr;
		xr = a[18];
		a[27] -= a[11];
		a[19] -= xr;
		a[18] = a[15] - xr;
		a[15] += xr;

		xr = a[19];
		a[10] -= xr;
		a[19] = a[14] - xr;
		a[14] += xr;
		xr = a[10];
		a[11] -= xr;
		a[10] = a[23] - xr;
		a[23] += xr;
		xr = a[11];
		a[26] -= xr;
		a[11] = a[22] - xr;
		a[22] += xr;
		xr = a[26];
		a[27] -= xr;
		a[26] = a[7] - xr;
		a[7] += xr;

		xr = a[27];
		a[27] = a[6] - xr;
		a[6] += xr;

		xr = Math.SQRT2 * (a[0] - a[4]);
		a[0] += a[4];
		a[4] = xr;
		xr = Math.SQRT2 * (a[1] - a[5]);
		a[1] += a[5];
		a[5] = xr;
		xr = Math.SQRT2 * (a[16] - a[20]);
		a[16] += a[20];
		a[20] = xr;
		xr = Math.SQRT2 * (a[17] - a[21]);
		a[17] += a[21];
		a[21] = xr;

		xr = -Math.SQRT2 * (a[8] - a[12]);
		a[8] += a[12];
		a[12] = xr - a[8];
		xr = -Math.SQRT2 * (a[9] - a[13]);
		a[9] += a[13];
		a[13] = xr - a[9];
		xr = -Math.SQRT2 * (a[25] - a[29]);
		a[25] += a[29];
		a[29] = xr - a[25];
		xr = -Math.SQRT2 * (a[24] + a[28]);
		a[24] -= a[28];
		a[28] = xr - a[24];

		xr = a[24] - a[16];
		a[24] = xr;
		xr = a[20] - xr;
		a[20] = xr;
		xr = a[28] - xr;
		a[28] = xr;

		xr = a[25] - a[17];
		a[25] = xr;
		xr = a[21] - xr;
		a[21] = xr;
		xr = a[29] - xr;
		a[29] = xr;

		xr = a[17] - a[1];
		a[17] = xr;
		xr = a[9] - xr;
		a[9] = xr;
		xr = a[25] - xr;
		a[25] = xr;
		xr = a[5] - xr;
		a[5] = xr;
		xr = a[21] - xr;
		a[21] = xr;
		xr = a[13] - xr;
		a[13] = xr;
		xr = a[29] - xr;
		a[29] = xr;

		xr = a[1] - a[0];
		a[1] = xr;
		xr = a[16] - xr;
		a[16] = xr;
		xr = a[17] - xr;
		a[17] = xr;
		xr = a[8] - xr;
		a[8] = xr;
		xr = a[9] - xr;
		a[9] = xr;
		xr = a[24] - xr;
		a[24] = xr;
		xr = a[25] - xr;
		a[25] = xr;
		xr = a[4] - xr;
		a[4] = xr;
		xr = a[5] - xr;
		a[5] = xr;
		xr = a[20] - xr;
		a[20] = xr;
		xr = a[21] - xr;
		a[21] = xr;
		xr = a[12] - xr;
		a[12] = xr;
		xr = a[13] - xr;
		a[13] = xr;
		xr = a[28] - xr;
		a[28] = xr;
		xr = a[29] - xr;
		a[29] = xr;

		xr = a[0];
		a[0] += a[31];
		a[31] -= xr;
		xr = a[1];
		a[1] += a[30];
		a[30] -= xr;
		xr = a[16];
		a[16] += a[15];
		a[15] -= xr;
		xr = a[17];
		a[17] += a[14];
		a[14] -= xr;
		xr = a[8];
		a[8] += a[23];
		a[23] -= xr;
		xr = a[9];
		a[9] += a[22];
		a[22] -= xr;
		xr = a[24];
		a[24] += a[7];
		a[7] -= xr;
		xr = a[25];
		a[25] += a[6];
		a[6] -= xr;
		xr = a[4];
		a[4] += a[27];
		a[27] -= xr;
		xr = a[5];
		a[5] += a[26];
		a[26] -= xr;
		xr = a[20];
		a[20] += a[11];
		a[11] -= xr;
		xr = a[21];
		a[21] += a[10];
		a[10] -= xr;
		xr = a[12];
		a[12] += a[19];
		a[19] -= xr;
		xr = a[13];
		a[13] += a[18];
		a[18] -= xr;
		xr = a[28];
		a[28] += a[3];
		a[3] -= xr;
		xr = a[29];
		a[29] += a[2];
		a[2] -= xr;
	}

	private mdct_short(inout: Float32Array, inoutPos: number) {
		for (let l = 0; l < 3; l++) {
			let tc0;
			let tc1;
			let tc2;
			let ts0;
			let ts1;
			let ts2;

			ts0 = inout[inoutPos + 2 * 3] * this.win[SHORT_TYPE][0] - inout[inoutPos + 5 * 3];
			tc0 = inout[inoutPos + 0 * 3] * this.win[SHORT_TYPE][2] - inout[inoutPos + 3 * 3];
			tc1 = ts0 + tc0;
			tc2 = ts0 - tc0;

			ts0 = inout[inoutPos + 5 * 3] * this.win[SHORT_TYPE][0] + inout[inoutPos + 2 * 3];
			tc0 = inout[inoutPos + 3 * 3] * this.win[SHORT_TYPE][2] + inout[inoutPos + 0 * 3];
			ts1 = ts0 + tc0;
			ts2 = -ts0 + tc0;

			tc0 = (inout[inoutPos + 1 * 3] * this.win[SHORT_TYPE][1] - inout[inoutPos + 4 * 3]) * 2.069978111953089e-11;

			ts0 = (inout[inoutPos + 4 * 3] * this.win[SHORT_TYPE][1] + inout[inoutPos + 1 * 3]) * 2.069978111953089e-11;

			inout[inoutPos + 3 * 0] = tc1 * 1.90752519173728e-11 + tc0;

			inout[inoutPos + 3 * 5] = -ts1 * 1.90752519173728e-11 + ts0;

			tc2 = tc2 * 0.86602540378443870761 * 1.907525191737281e-11;

			ts1 = ts1 * 0.5 * 1.907525191737281e-11 + ts0;
			inout[inoutPos + 3 * 1] = tc2 - ts1;
			inout[inoutPos + 3 * 2] = tc2 + ts1;

			tc1 = tc1 * 0.5 * 1.907525191737281e-11 - tc0;
			ts2 = ts2 * 0.86602540378443870761 * 1.907525191737281e-11;

			inout[inoutPos + 3 * 3] = tc1 + ts2;
			inout[inoutPos + 3 * 4] = tc1 - ts2;

			inoutPos++;
		}
	}

	private mdct_long(out: Float32Array, outPos: number, _in: Float32Array) {
		let ct;
		let st;
		{
			const tc1 = _in[17] - _in[9];
			const tc3 = _in[15] - _in[11];
			const tc4 = _in[14] - _in[12];
			const ts5 = _in[0] + _in[8];
			let ts6 = _in[1] + _in[7];
			const ts7 = _in[2] + _in[6];
			const ts8 = _in[3] + _in[5];

			out[outPos + 17] = ts5 + ts7 - ts8 - (ts6 - _in[4]);
			st = (ts5 + ts7 - ts8) * this.cx[12 + 7] + (ts6 - _in[4]);
			ct = (tc1 - tc3 - tc4) * this.cx[12 + 6];
			out[outPos + 5] = ct + st;
			out[outPos + 6] = ct - st;

			const tc2 = (_in[16] - _in[10]) * this.cx[12 + 6];
			ts6 = ts6 * this.cx[12 + 7] + _in[4];
			ct = tc1 * this.cx[12 + 0] + tc2 + tc3 * this.cx[12 + 1] + tc4 * this.cx[12 + 2];
			st = -ts5 * this.cx[12 + 4] + ts6 - ts7 * this.cx[12 + 5] + ts8 * this.cx[12 + 3];
			out[outPos + 1] = ct + st;
			out[outPos + 2] = ct - st;

			ct = tc1 * this.cx[12 + 1] - tc2 - tc3 * this.cx[12 + 2] + tc4 * this.cx[12 + 0];
			st = -ts5 * this.cx[12 + 5] + ts6 - ts7 * this.cx[12 + 3] + ts8 * this.cx[12 + 4];
			out[outPos + 9] = ct + st;
			out[outPos + 10] = ct - st;

			ct = tc1 * this.cx[12 + 2] - tc2 + tc3 * this.cx[12 + 0] - tc4 * this.cx[12 + 1];
			st = ts5 * this.cx[12 + 3] - ts6 + ts7 * this.cx[12 + 4] - ts8 * this.cx[12 + 5];
			out[outPos + 13] = ct + st;
			out[outPos + 14] = ct - st;
		}
		{
			const ts1 = _in[8] - _in[0];
			const ts3 = _in[6] - _in[2];
			const ts4 = _in[5] - _in[3];
			const tc5 = _in[17] + _in[9];
			let tc6 = _in[16] + _in[10];
			const tc7 = _in[15] + _in[11];
			const tc8 = _in[14] + _in[12];

			out[outPos + 0] = tc5 + tc7 + tc8 + (tc6 + _in[13]);
			ct = (tc5 + tc7 + tc8) * this.cx[12 + 7] - (tc6 + _in[13]);
			st = (ts1 - ts3 + ts4) * this.cx[12 + 6];
			out[outPos + 11] = ct + st;
			out[outPos + 12] = ct - st;

			const ts2 = (_in[7] - _in[1]) * this.cx[12 + 6];
			tc6 = _in[13] - tc6 * this.cx[12 + 7];
			ct = tc5 * this.cx[12 + 3] - tc6 + tc7 * this.cx[12 + 4] + tc8 * this.cx[12 + 5];
			st = ts1 * this.cx[12 + 2] + ts2 + ts3 * this.cx[12 + 0] + ts4 * this.cx[12 + 1];
			out[outPos + 3] = ct + st;
			out[outPos + 4] = ct - st;

			ct = -tc5 * this.cx[12 + 5] + tc6 - tc7 * this.cx[12 + 3] - tc8 * this.cx[12 + 4];
			st = ts1 * this.cx[12 + 1] + ts2 - ts3 * this.cx[12 + 2] - ts4 * this.cx[12 + 0];
			out[outPos + 7] = ct + st;
			out[outPos + 8] = ct - st;

			ct = -tc5 * this.cx[12 + 4] + tc6 - tc7 * this.cx[12 + 5] - tc8 * this.cx[12 + 3];
			st = ts1 * this.cx[12 + 0] - ts2 + ts3 * this.cx[12 + 1] - ts4 * this.cx[12 + 2];
			out[outPos + 15] = ct + st;
			out[outPos + 16] = ct - st;
		}
	}

	mdct_sub48(gfc: LameInternalFlags, w0: Float32Array, w1: Float32Array) {
		let wk = w0;
		let wkPos = 286;

		for (let ch = 0; ch < gfc.channels_out; ch++) {
			for (let gr = 0; gr < gfc.mode_gr; gr++) {
				let band;
				const gi = gfc.l3_side.tt[gr][ch];
				const mdct_enc = gi.xr;
				let mdct_encPos = 0;
				const samp = gfc.sb_sample[ch][1 - gr];
				let sampPos = 0;

				for (let k = 0; k < 18 / 2; k++) {
					this.window_subband(wk, wkPos, samp[sampPos]);
					this.window_subband(wk, wkPos + 32, samp[sampPos + 1]);
					sampPos += 2;
					wkPos += 64;

					for (band = 1; band < 32; band += 2) {
						samp[sampPos - 1][band] *= -1;
					}
				}

				for (band = 0; band < 32; band++, mdct_encPos += 18) {
					let type = gi.block_type;
					const band0 = gfc.sb_sample[ch][gr];
					const band1 = gfc.sb_sample[ch][1 - gr];
					if (gi.mixed_block_flag !== 0 && band < 2) type = 0;
					if (gfc.amp_filter[band] < 1e-12) {
						fillArray(mdct_enc, mdct_encPos + 0, mdct_encPos + 18, 0);
					} else {
						if (gfc.amp_filter[band] < 1.0) {
							for (let k = 0; k < 18; k++) band1[k][this.order[band]] *= gfc.amp_filter[band];
						}
						if (type === SHORT_TYPE) {
							for (let k = -NewMDCT.NS / 4; k < 0; k++) {
								const w = this.win[SHORT_TYPE][k + 3];
								mdct_enc[mdct_encPos + k * 3 + 9] = band0[9 + k][this.order[band]] * w - band0[8 - k][this.order[band]];
								mdct_enc[mdct_encPos + k * 3 + 18] = band0[14 - k][this.order[band]] * w + band0[15 + k][this.order[band]];
								mdct_enc[mdct_encPos + k * 3 + 10] = band0[15 + k][this.order[band]] * w - band0[14 - k][this.order[band]];
								mdct_enc[mdct_encPos + k * 3 + 19] = band1[2 - k][this.order[band]] * w + band1[3 + k][this.order[band]];
								mdct_enc[mdct_encPos + k * 3 + 11] = band1[3 + k][this.order[band]] * w - band1[2 - k][this.order[band]];
								mdct_enc[mdct_encPos + k * 3 + 20] = band1[8 - k][this.order[band]] * w + band1[9 + k][this.order[band]];
							}
							this.mdct_short(mdct_enc, mdct_encPos);
						} else {
							const work = new Float32Array(18);
							for (let k = -NewMDCT.NL / 4; k < 0; k++) {
								const a = this.win[type][k + 27] * band1[k + 9][this.order[band]] + this.win[type][k + 36] * band1[8 - k][this.order[band]];
								const b = this.win[type][k + 9] * band0[k + 9][this.order[band]] - this.win[type][k + 18] * band0[8 - k][this.order[band]];
								work[k + 9] = a - b * this.tantab_l[3 + k + 9];
								work[k + 18] = a * this.tantab_l[3 + k + 9] + b;
							}

							this.mdct_long(mdct_enc, mdct_encPos, work);
						}
					}

					if (type !== SHORT_TYPE && band !== 0) {
						for (let k = 7; k >= 0; --k) {
							const bu = mdct_enc[mdct_encPos + k] * this.ca[20 + k] + mdct_enc[mdct_encPos + -1 - k] * this.cs[28 + k];
							const bd = mdct_enc[mdct_encPos + k] * this.cs[28 + k] - mdct_enc[mdct_encPos + -1 - k] * this.ca[20 + k];

							mdct_enc[mdct_encPos + -1 - k] = bu;
							mdct_enc[mdct_encPos + k] = bd;
						}
					}
				}
			}
			wk = w1;
			wkPos = 286;
			if (gfc.mode_gr === 1) {
				for (let i = 0; i < 18; i++) {
					copyArray(gfc.sb_sample[ch][1][i], 0, gfc.sb_sample[ch][0][i], 0, 32);
				}
			}
		}
	}
}