/* $NetBSD: cosdata.c,v 1.3 2017/01/30 15:50:21 christos Exp $ */

/*-
 * Copyright (c) 2015 - 2016 Nathanial Sloss <nathanialsloss@yahoo.com.au>
 * All rights reserved.
 *
 *              This software is dedicated to the memory of -
 *         Baron James Anlezark (Barry) - 1 Jan 1949 - 13 May 2012.
 *
 *              Barry was a man who loved his music.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <math.h>
#include <stdio.h>

static const double sbc_coeffs8[] = {
        0.00000000e+00, 1.56575398e-04, 3.43256425e-04, 5.54620202e-04,
        8.23919506e-04, 1.13992507e-03, 1.47640169e-03, 1.78371725e-03,
        2.01182542e-03, 2.10371989e-03, 1.99454554e-03, 1.61656283e-03,
        9.02154502e-04, -1.78805361e-04, -1.64973098e-03, -3.49717454e-03,
        5.65949473e-03, 8.02941163e-03, 1.04584443e-02, 1.27472335e-02,
        1.46525263e-02, 1.59045603e-02, 1.62208471e-02, 1.53184106e-02,
        1.29371806e-02, 8.85757540e-03, 2.92408442e-03, -4.91578024e-03,
        -1.46404076e-02, -2.61098752e-02, -3.90751381e-02, -5.31873032e-02,
        6.79989431e-02, 8.29847578e-02, 9.75753918e-02, 1.11196689e-01,
        1.23264548e-01, 1.33264415e-01, 1.40753505e-01, 1.45389847e-01,
        1.46955068e-01, 1.45389847e-01, 1.40753505e-01, 1.33264415e-01,
        1.23264548e-01, 1.11196689e-01, 9.75753918e-02, 8.29847578e-02,
        -6.79989431e-02, -5.31873032e-02, -3.90751381e-02, -2.61098752e-02,
        -1.46404076e-02, -4.91578024e-03, 2.92408442e-03, 8.85757540e-03,
        1.29371806e-02, 1.53184106e-02, 1.62208471e-02, 1.59045603e-02,
        1.46525263e-02, 1.27472335e-02, 1.04584443e-02, 8.02941163e-03,
        -5.65949473e-03, -3.49717454e-03, -1.64973098e-03, -1.78805361e-04,
        9.02154502e-04, 1.61656283e-03, 1.99454554e-03, 2.10371989e-03,
        2.01182542e-03, 1.78371725e-03, 1.47640169e-03, 1.13992507e-03,
        8.23919506e-04, 5.54620202e-04, 3.43256425e-04, 1.56575398e-04,
};

static const double sbc_coeffs4[] = {
         0.00000000e+00, 5.36548976e-04, 1.49188357e-03, 2.73370904e-03,
         3.83720193e-03, 3.89205149e-03, 1.86581691e-03,-3.06012286e-03,
         1.09137620e-02, 2.04385087e-02, 2.88757392e-02, 3.21939290e-02,
         2.58767811e-02, 6.13245186e-03,-2.88217274e-02,-7.76463494e-02,
         1.35593274e-01, 1.94987841e-01, 2.46636662e-01, 2.81828203e-01,
         2.94315332e-01, 2.81828203e-01, 2.46636662e-01, 1.94987841e-01,
        -1.35593274e-01,-7.76463494e-02,-2.88217274e-02, 6.13245186e-03,
         2.58767811e-02, 3.21939290e-02, 2.88757392e-02, 2.04385087e-02,
        -1.09137620e-02,-3.06012286e-03, 1.86581691e-03, 3.89205149e-03,
         3.83720193e-03, 2.73370904e-03, 1.49188357e-03, 5.36548976e-04, 
};

#define COEFFS_MULTI    (1 << 12)
#define SI_MULTI        512

static void
arrayprint(const char *name, const double *arr, size_t len)
{
        size_t k, count;

        printf("static const int32_t %s[] = {\n\t", name);
        for (count = k = 0; k < len; k++, count++) {
                if (count % 8 == 0 && count != 0)
                        printf("\n\t");
                printf("%d, ", (int)roundf((float)arr[k] * COEFFS_MULTI));
        }
        printf("\n};\n");
}

#define ARRAYPRINT(a)   arrayprint(#a, a, sizeof(a) / sizeof(a[0]))

static void
cosprint(int lim, int sgn)
{
        size_t count, i, k;
        size_t mi = lim * 4;
        size_t mk = mi * 2;
        int dk = sgn * lim * 2;
        double mp = M_PI_4 / lim;
        float val;

        printf("static const int32_t cos%sdata%zu[%zu][%zu] = {\n\t",
            sgn == -1 ? "" : "dec", mi, mi, mk);

        for (count = 0, i = 0; i < mi; i++) {
                for (k = 0; k < mk; k++, count++) {
                        if (count % 8 == 0 && count != 0)
                                printf("\n\t");
                        if (k == 0)
                                printf("{ ");

                        val = cosf((i + 0.5) * ((int)k + dk) * mp);
                        printf("%d, ", (int)roundf(val * SI_MULTI));

                        if (k == mk - 1)
                                printf("},");
                }
        }
        printf("\n};\n");
}

int
main(void)
{
        printf("/* sbc_coeffs.h - Automatically generated by cosdata.c. */\n"
            "\n");

        printf("#define\tSIMULTI\t%d\n\n", SI_MULTI);
        printf("#define\tCOEFFSMULTI\t%d\n\n", COEFFS_MULTI);

        ARRAYPRINT(sbc_coeffs8);
        ARRAYPRINT(sbc_coeffs4);

        cosprint(2, -1);
        cosprint(1, -1);
        cosprint(2, 1);
        cosprint(1, 1);

        return 0;
}