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Sourcecode: beep-media-player version File versions  Download package

tabinit.c

#include <stdlib.h>
#include <math.h>

#include "mpg123.h"

real mpg123_decwin[512 + 32];
static real cos64[16], cos32[8], cos16[4], cos8[2], cos4[1];
real *mpg123_pnts[] = { cos64, cos32, cos16, cos8, cos4 };

static unsigned char *mpg123_conv16to8_buf = NULL;
unsigned char *mpg123_conv16to8;

static long intwinbase[] = {
    0, -1, -1, -1, -1, -1, -1, -2, -2, -2,
    -2, -3, -3, -4, -4, -5, -5, -6, -7, -7,
    -8, -9, -10, -11, -13, -14, -16, -17, -19, -21,
    -24, -26, -29, -31, -35, -38, -41, -45, -49, -53,
    -58, -63, -68, -73, -79, -85, -91, -97, -104, -111,
    -117, -125, -132, -139, -147, -154, -161, -169, -176, -183,
    -190, -196, -202, -208, -213, -218, -222, -225, -227, -228,
    -228, -227, -224, -221, -215, -208, -200, -189, -177, -163,
    -146, -127, -106, -83, -57, -29, 2, 36, 72, 111,
    153, 197, 244, 294, 347, 401, 459, 519, 581, 645,
    711, 779, 848, 919, 991, 1064, 1137, 1210, 1283, 1356,
    1428, 1498, 1567, 1634, 1698, 1759, 1817, 1870, 1919, 1962,
    2001, 2032, 2057, 2075, 2085, 2087, 2080, 2063, 2037, 2000,
    1952, 1893, 1822, 1739, 1644, 1535, 1414, 1280, 1131, 970,
    794, 605, 402, 185, -45, -288, -545, -814, -1095, -1388,
    -1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
    -5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
    -8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
    -9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
    -7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
    -70, 998, 2122, 3300, 4533, 5818, 7154, 8540, 9975, 11455,
    12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
    30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
    48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
    64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
    73415, 73908, 74313, 74630, 74856, 74992, 75038
};

void mpg123_make_decode_tables_fpu(long scaleval);
void mpg123_make_decode_tables_mmx(long scaleval);

void
mpg123_make_decode_tables_fpu(long scaleval)
{
    int i, j;
    real *table, *costab;

    for (i = 0; i < 5; i++) {
        int kr = 0x10 >> i;
        int divv = 0x40 >> i;
        costab = mpg123_pnts[i];
        for (j = 0; j < kr; j++)
            costab[j] =
                1.0 / (2.0 *
                       cos(M_PI * ((double) j * 2.0 + 1.0) / (double) divv));
    }

    table = mpg123_decwin;
    scaleval = -scaleval;
    for (i = 0, j = 0; i < 256; i++, j++, table += 32) {
        if (table < mpg123_decwin + 512 + 16)
            table[16] = table[0] =
                (double) intwinbase[j] / 65536.0 * (double) scaleval;
        if (i % 32 == 31)
            table -= 1023;
        if (i % 64 == 63)
            scaleval = -scaleval;
    }

    for ( /* i=256 */ ; i < 512; i++, j--, table += 32) {
        if (table < mpg123_decwin + 512 + 16)
            table[16] = table[0] =
                (double) intwinbase[j] / 65536.0 * (double) scaleval;
        if (i % 32 == 31)
            table -= 1023;
        if (i % 64 == 63)
            scaleval = -scaleval;
    }
}

#ifdef USE_SIMD

gint16 mpg123_decwins[(512 + 32) * 2];

void
mpg123_make_decode_tables_mmx(long scaleval)
{
    int i, j, p, a;

    scaleval = -scaleval;
    a = 1;
    for (i = 0, j = 0, p = 0; i < 512; i++, j += a, p += 32) {
        if (p < 512 + 16) {
            int val = ((gint64) intwinbase[j] * scaleval) >> 17;
            val = CLAMP(val, -32767, 32767);
            if (p < 512) {
                int n = 1055 - p;
                mpg123_decwins[n - 16] = val;
                mpg123_decwins[n] = val;
            }
            if (!(p & 1))
                val = -val;
            mpg123_decwins[p + 16] = val;
            mpg123_decwins[p] = val;
        }
        if (i % 32 == 31)
            p -= 1023;
        if (i % 64 == 63)
            scaleval = -scaleval;
        if (i == 256)
            a = -1;
    }
}

#else
void
mpg123_make_decode_tables_mmx(long scaleval)
{
}
#endif

void
mpg123_make_decode_tables(long scaleval)
{
    mpg123_make_decode_tables_fpu(scaleval);
    mpg123_make_decode_tables_mmx(scaleval);
}




void
mpg123_make_conv16to8_table(void)
{
    int i;

    /*
     * ????: 8.0 is right but on SB cards '2.0' is a better value ???
     */

    if (!mpg123_conv16to8_buf) {
        mpg123_conv16to8_buf = g_malloc(8192);
        mpg123_conv16to8 = mpg123_conv16to8_buf + 4096;
    }

    for (i = -4096; i < 4096; i++) {
        mpg123_conv16to8[i] = (i >> 5) + 128;
    }
}

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