annotate fft/nayukic/FFT.js @ 40:223f770b5341 kissfft-double tip

Try a double-precision kissfft

"use strict";

var nayukiCModule = NayukiCModule({});

var nc_precalc = nayukiCModule.cwrap(
    'precalc', 'number', ['number']
);

var nc_dispose = nayukiCModule.cwrap(
    'dispose', 'void', ['number']
);

var nc_transform_radix2_precalc = nayukiCModule.cwrap(
    'transform_radix2_precalc', 'void', ['number', 'number', 'number', 'number']
);

var nc_precalc_f = nayukiCModule.cwrap(
    'precalc_f', 'number', ['number']
);

var nc_dispose_f = nayukiCModule.cwrap(
    'dispose_f', 'void', ['number']
);

var nc_transform_radix2_precalc_f = nayukiCModule.cwrap(
    'transform_radix2_precalc_f', 'void', ['number', 'number', 'number', 'number']
);

function FFTNayukiC(n) {

    this.n = n;
    this.rptr = nayukiCModule._malloc(n*8 + n*8);
    this.iptr = this.rptr + n*8;
    this.rarr = new Float64Array(nayukiCModule.HEAPU8.buffer, this.rptr, n);
    this.iarr = new Float64Array(nayukiCModule.HEAPU8.buffer, this.iptr, n);
    this.tables = nc_precalc(n);

    this.forward = function(real, imag) {
	this.rarr.set(real);
	this.iarr.set(imag);
	nc_transform_radix2_precalc(this.rptr, this.iptr, this.n, this.tables);
	real.set(this.rarr);
	imag.set(this.iarr);
    };

    this.dispose = function() {
	nayukiCModule._free(this.rptr);
	nc_dispose(this.tables);
    }
}

function FFTNayukiCFloat(n) {

    this.n = n;
    this.rptr = nayukiCModule._malloc(n*4 + n*4);
    this.iptr = this.rptr + n*4;
    this.rarr = new Float32Array(nayukiCModule.HEAPU8.buffer, this.rptr, n);
    this.iarr = new Float32Array(nayukiCModule.HEAPU8.buffer, this.iptr, n);
    this.tables = nc_precalc_f(n);

    this.forward = function(real, imag) {
	this.rarr.set(real);
	this.iarr.set(imag);
	nc_transform_radix2_precalc_f(this.rptr, this.iptr, this.n, this.tables);
	real.set(this.rarr);
	imag.set(this.iarr);
    };

    this.dispose = function() {
	nayukiCModule._free(this.rptr);
	nc_dispose_f(this.tables);
    }
}