32a595222d
Made the OpenMPT / legacy OpenMPT and mpg123 libraries pre-built. Changed the OpenMPT and vgmstream plugins to import the libraries as they are now. Made mpg123 embedded and imported by the main binary, since it's now shared by two plugins. Signed-off-by: Christopher Snowhill <kode54@gmail.com>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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The function to compute the layer I and II tables at runtime or for pregeneration.
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copyright ?-2021 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.org
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initially written by Michael Hipp (in layer2.c).
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The type clreal is either double or float. POW() is pow() or powf().
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*/
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void init_layer12(void)
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{
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const clreal mulmul[27] =
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{
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0.0 , -2.0/3.0 , 2.0/3.0 ,
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2.0/7.0 , 2.0/15.0 , 2.0/31.0, 2.0/63.0 , 2.0/127.0 , 2.0/255.0 ,
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2.0/511.0 , 2.0/1023.0 , 2.0/2047.0 , 2.0/4095.0 , 2.0/8191.0 ,
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2.0/16383.0 , 2.0/32767.0 , 2.0/65535.0 ,
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-4.0/5.0 , -2.0/5.0 , 2.0/5.0, 4.0/5.0 ,
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-8.0/9.0 , -4.0/9.0 , -2.0/9.0 , 2.0/9.0 , 4.0/9.0 , 8.0/9.0
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};
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// void init_layer12_stuff()
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// real* init_layer12_table()
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for(int k=0;k<27;k++)
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{
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int i,j;
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clreal *table = layer12_table[k];
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for(j=3,i=0;i<63;i++,j--)
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*table++ = mulmul[k] * POW(2.0,(clreal) j / 3.0);
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*table++ = 0.0;
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}
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// void init_layer12()
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const unsigned char base[3][9] =
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{
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{ 1 , 0, 2 , } ,
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{ 17, 18, 0 , 19, 20 , } ,
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{ 21, 1, 22, 23, 0, 24, 25, 2, 26 }
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};
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int i,j,k,l,len;
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const int tablen[3] = { 3 , 5 , 9 };
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unsigned char *itable;
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unsigned char *tables[3] = { grp_3tab , grp_5tab , grp_9tab };
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for(i=0;i<3;i++)
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{
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itable = tables[i];
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len = tablen[i];
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for(j=0;j<len;j++)
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for(k=0;k<len;k++)
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for(l=0;l<len;l++)
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{
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*itable++ = base[i][l];
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*itable++ = base[i][k];
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*itable++ = base[i][j];
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}
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}
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}
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