forked from KolibriOS/kolibrios
159 lines
4.7 KiB
C
159 lines
4.7 KiB
C
/*
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tabinit.c: initialize tables...
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copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.de
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initially written by Michael Hipp
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*/
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//#include <stdlib.h>
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//#include "config.h"
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#include "mpg123.h"
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//#include "debug.h"
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static unsigned char *conv16to8_buf = NULL;
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unsigned char *conv16to8;
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#ifndef USE_MMX
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real decwin[512+32];
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#ifdef USE_ALTIVEC
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static real __attribute__ ((aligned (16))) cos64[16];
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static real __attribute__ ((aligned (16))) cos32[8];
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static real __attribute__ ((aligned (16))) cos16[4];
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static real __attribute__ ((aligned (16))) cos8[2];
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static real __attribute__ ((aligned (16))) cos4[1];
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#else
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static real cos64[16],cos32[8],cos16[4],cos8[2],cos4[1];
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#endif
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real *pnts[] = { cos64,cos32,cos16,cos8,cos4 };
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static long intwinbase[] = {
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0, -1, -1, -1, -1, -1, -1, -2, -2, -2,
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-2, -3, -3, -4, -4, -5, -5, -6, -7, -7,
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-8, -9, -10, -11, -13, -14, -16, -17, -19, -21,
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-24, -26, -29, -31, -35, -38, -41, -45, -49, -53,
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-58, -63, -68, -73, -79, -85, -91, -97, -104, -111,
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-117, -125, -132, -139, -147, -154, -161, -169, -176, -183,
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-190, -196, -202, -208, -213, -218, -222, -225, -227, -228,
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-228, -227, -224, -221, -215, -208, -200, -189, -177, -163,
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-146, -127, -106, -83, -57, -29, 2, 36, 72, 111,
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153, 197, 244, 294, 347, 401, 459, 519, 581, 645,
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711, 779, 848, 919, 991, 1064, 1137, 1210, 1283, 1356,
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1428, 1498, 1567, 1634, 1698, 1759, 1817, 1870, 1919, 1962,
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2001, 2032, 2057, 2075, 2085, 2087, 2080, 2063, 2037, 2000,
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1952, 1893, 1822, 1739, 1644, 1535, 1414, 1280, 1131, 970,
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794, 605, 402, 185, -45, -288, -545, -814, -1095, -1388,
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-1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
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-5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
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-8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
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-9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
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-7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
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-70, 998, 2122, 3300, 4533, 5818, 7154, 8540, 9975, 11455,
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12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
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30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
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48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
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64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
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73415, 73908, 74313, 74630, 74856, 74992, 75038 };
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#pragma warning(disable:4244)
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void make_decode_tables(long scaleval)
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{
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int i,j,k,kr,divv;
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real *costab;
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int idx;
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for(i=0;i<5;i++)
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{
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kr=0x10>>i; divv=0x40>>i;
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costab = pnts[i];
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for(k=0;k<kr;k++)
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costab[k] = DOUBLE_TO_REAL(1.0 / (2.0 * cos(M_PI * ((double) k * 2.0 + 1.0) / (double) divv)));
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}
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idx = 0;
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scaleval = -scaleval;
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for(i=0,j=0;i<256;i++,j++,idx+=32)
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{
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if(idx < 512+16)
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decwin[idx+16] = decwin[idx] = DOUBLE_TO_REAL((double) intwinbase[j] / 65536.0 * (double) scaleval);
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if(i % 32 == 31)
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idx -= 1023;
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if(i % 64 == 63)
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scaleval = - scaleval;
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}
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for( /* i=256 */ ;i<512;i++,j--,idx+=32)
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{
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if(idx < 512+16)
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decwin[idx+16] = decwin[idx] = DOUBLE_TO_REAL((double) intwinbase[j] / 65536.0 * (double) scaleval);
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if(i % 32 == 31)
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idx -= 1023;
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if(i % 64 == 63)
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scaleval = - scaleval;
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}
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}
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#endif
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#if 0
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int make_conv16to8_table(int mode)
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{
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int i;
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/*
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* ????: 8.0 is right but on SB cards '2.0' is a better value ???
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*/
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const double mul = 8.0;
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if(!conv16to8_buf) {
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conv16to8_buf = (unsigned char *) malloc(8192);
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if(!conv16to8_buf) {
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error("Can't allocate 16 to 8 converter table!");
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return -1;
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}
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conv16to8 = conv16to8_buf + 4096;
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}
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if(mode == AUDIO_FORMAT_ULAW_8) {
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double m=127.0 / log(256.0);
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int c1;
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for(i=-4096;i<4096;i++) {
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/* dunno whether this is a valid transformation rule ?!?!? */
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if(i < 0)
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c1 = 127 - (int) (log( 1.0 - 255.0 * (double) i*mul / 32768.0 ) * m);
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else
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c1 = 255 - (int) (log( 1.0 + 255.0 * (double) i*mul / 32768.0 ) * m);
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if(c1 < 0 || c1 > 255)
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fprintf(stderr,"Converror %d %d\n",i,c1);
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if(c1 == 0)
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c1 = 2;
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conv16to8[i] = (unsigned char) c1;
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}
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}
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else if(mode == AUDIO_FORMAT_SIGNED_8) {
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for(i=-4096;i<4096;i++) {
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conv16to8[i] = i>>5;
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}
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}
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else if(mode == AUDIO_FORMAT_UNSIGNED_8) {
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for(i=-4096;i<4096;i++) {
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conv16to8[i] = (i>>5)+128;
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}
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}
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else {
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for(i=-4096;i<4096;i++) {
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conv16to8[i] = 0;
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}
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}
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return 0;
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}
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#endif
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