📄 trigtabs.c
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#include "statname.h"
extern const float coef32[31];
extern const float look_global[256+2+4];
extern const float look_scale[2][4][32];
extern const float look_pow[64];
extern const float look_subblock[8];
extern const float lr[2][8][2];
extern const float lr2[2][2][64][2];
/*
pi = 4.0*atan(1.0);
n = 16;
k = 0;
for(i=0; i<5; i++, n=n/2) {
for(p=0; p<n; p++, k++) {
t = (pi/(4*n))*(2*p+1);
coef32[k] = (float)(0.50/cos(t));
}
}
*/
const float coef32[31] = {
5.0060302019e-001f, 5.0547093153e-001f, 5.1544731855e-001f, 5.3104257584e-001f,
5.5310392380e-001f, 5.8293497562e-001f, 6.2250411510e-001f, 6.7480832338e-001f,
7.4453628063e-001f, 8.3934962749e-001f, 9.7256821394e-001f, 1.1694399118e+000f,
1.4841645956e+000f, 2.0577809811e+000f, 3.4076085091e+000f, 1.0190008163e+001f,
5.0241929293e-001f, 5.2249860764e-001f, 5.6694406271e-001f, 6.4682179689e-001f,
7.8815460205e-001f, 1.0606776476e+000f, 1.7224471569e+000f, 5.1011486053e+000f,
5.0979560614e-001f, 6.0134488344e-001f, 8.9997619390e-001f, 2.5629155636e+000f,
5.4119610786e-001f, 1.3065630198e+000f, 7.0710676908e-001f,
};
/* 8 bit plus 2 lookup x = pow(2.0, 0.25*(global_gain-210))
* extra 2 for ms scaling by 1/sqrt(2)
* extra 4 for cvt to mono scaling by 1/2
*
*
for(i=0;i<256+2+4;i++)
x[i] = (float)pow(2.0, 0.25*((i-(2+4)) - 210 + GLOBAL_GAIN_SCALE));
*/
const float look_global[256+2+4] = {
1.8189894035e-012f, 2.1631550717e-012f, 2.5724394403e-012f, 3.0591633827e-012f,
3.6379788071e-012f, 4.3263101435e-012f, 5.1448788806e-012f, 6.1183267654e-012f,
7.2759576142e-012f, 8.6526202869e-012f, 1.0289757761e-011f, 1.2236653531e-011f,
1.4551915228e-011f, 1.7305240574e-011f, 2.0579515522e-011f, 2.4473307061e-011f,
2.9103830457e-011f, 3.4610481148e-011f, 4.1159031045e-011f, 4.8946614123e-011f,
5.8207660913e-011f, 6.9220962295e-011f, 8.2318062089e-011f, 9.7893228246e-011f,
1.1641532183e-010f, 1.3844192459e-010f, 1.6463612418e-010f, 1.9578645649e-010f,
2.3283064365e-010f, 2.7688384918e-010f, 3.2927224836e-010f, 3.9157291298e-010f,
4.6566128731e-010f, 5.5376769836e-010f, 6.5854449671e-010f, 7.8314582597e-010f,
9.3132257462e-010f, 1.1075353967e-009f, 1.3170889934e-009f, 1.5662916519e-009f,
1.8626451492e-009f, 2.2150707935e-009f, 2.6341779868e-009f, 3.1325833039e-009f,
3.7252902985e-009f, 4.4301415869e-009f, 5.2683559737e-009f, 6.2651666077e-009f,
7.4505805969e-009f, 8.8602831738e-009f, 1.0536711947e-008f, 1.2530333215e-008f,
1.4901161194e-008f, 1.7720566348e-008f, 2.1073423895e-008f, 2.5060666431e-008f,
2.9802322388e-008f, 3.5441132695e-008f, 4.2146847790e-008f, 5.0121332862e-008f,
5.9604644775e-008f, 7.0882265391e-008f, 8.4293695579e-008f, 1.0024266572e-007f,
1.1920928955e-007f, 1.4176453078e-007f, 1.6858739116e-007f, 2.0048533145e-007f,
2.3841857910e-007f, 2.8352906156e-007f, 3.3717478232e-007f, 4.0097066289e-007f,
4.7683715820e-007f, 5.6705812312e-007f, 6.7434956463e-007f, 8.0194132579e-007f,
9.5367431641e-007f, 1.1341162462e-006f, 1.3486991293e-006f, 1.6038826516e-006f,
1.9073486328e-006f, 2.2682324925e-006f, 2.6973982585e-006f, 3.2077653032e-006f,
3.8146972656e-006f, 4.5364649850e-006f, 5.3947965171e-006f, 6.4155306063e-006f,
7.6293945313e-006f, 9.0729299700e-006f, 1.0789593034e-005f, 1.2831061213e-005f,
1.5258789063e-005f, 1.8145859940e-005f, 2.1579186068e-005f, 2.5662122425e-005f,
3.0517578125e-005f, 3.6291719880e-005f, 4.3158372137e-005f, 5.1324244851e-005f,
6.1035156250e-005f, 7.2583439760e-005f, 8.6316744273e-005f, 1.0264848970e-004f,
1.2207031250e-004f, 1.4516687952e-004f, 1.7263348855e-004f, 2.0529697940e-004f,
2.4414062500e-004f, 2.9033375904e-004f, 3.4526697709e-004f, 4.1059395880e-004f,
4.8828125000e-004f, 5.8066751808e-004f, 6.9053395418e-004f, 8.2118791761e-004f,
9.7656250000e-004f, 1.1613350362e-003f, 1.3810679084e-003f, 1.6423758352e-003f,
1.9531250000e-003f, 2.3226700723e-003f, 2.7621358167e-003f, 3.2847516704e-003f,
3.9062500000e-003f, 4.6453401446e-003f, 5.5242716335e-003f, 6.5695033409e-003f,
7.8125000000e-003f, 9.2906802893e-003f, 1.1048543267e-002f, 1.3139006682e-002f,
1.5625000000e-002f, 1.8581360579e-002f, 2.2097086534e-002f, 2.6278013363e-002f,
3.1250000000e-002f, 3.7162721157e-002f, 4.4194173068e-002f, 5.2556026727e-002f,
6.2500000000e-002f, 7.4325442314e-002f, 8.8388346136e-002f, 1.0511205345e-001f,
1.2500000000e-001f, 1.4865088463e-001f, 1.7677669227e-001f, 2.1022410691e-001f,
2.5000000000e-001f, 2.9730176926e-001f, 3.5355338454e-001f, 4.2044821382e-001f,
5.0000000000e-001f, 5.9460353851e-001f, 7.0710676908e-001f, 8.4089642763e-001f,
1.0000000000e+000f, 1.1892070770e+000f, 1.4142135382e+000f, 1.6817928553e+000f,
2.0000000000e+000f, 2.3784141541e+000f, 2.8284270763e+000f, 3.3635857105e+000f,
4.0000000000e+000f, 4.7568283081e+000f, 5.6568541527e+000f, 6.7271714211e+000f,
8.0000000000e+000f, 9.5136566162e+000f, 1.1313708305e+001f, 1.3454342842e+001f,
1.6000000000e+001f, 1.9027313232e+001f, 2.2627416611e+001f, 2.6908685684e+001f,
3.2000000000e+001f, 3.8054626465e+001f, 4.5254833221e+001f, 5.3817371368e+001f,
6.4000000000e+001f, 7.6109252930e+001f, 9.0509666443e+001f, 1.0763474274e+002f,
1.2800000000e+002f, 1.5221850586e+002f, 1.8101933289e+002f, 2.1526948547e+002f,
2.5600000000e+002f, 3.0443701172e+002f, 3.6203866577e+002f, 4.3053897095e+002f,
5.1200000000e+002f, 6.0887402344e+002f, 7.2407733154e+002f, 8.6107794189e+002f,
1.0240000000e+003f, 1.2177480469e+003f, 1.4481546631e+003f, 1.7221558838e+003f,
2.0480000000e+003f, 2.4354960938e+003f, 2.8963093262e+003f, 3.4443117676e+003f,
4.0960000000e+003f, 4.8709921875e+003f, 5.7926186523e+003f, 6.8886235352e+003f,
8.1920000000e+003f, 9.7419843750e+003f, 1.1585237305e+004f, 1.3777247070e+004f,
1.6384000000e+004f, 1.9483968750e+004f, 2.3170474609e+004f, 2.7554494141e+004f,
3.2768000000e+004f, 3.8967937500e+004f, 4.6340949219e+004f, 5.5108988281e+004f,
6.5536000000e+004f, 7.7935875000e+004f, 9.2681898438e+004f, 1.1021797656e+005f,
1.3107200000e+005f, 1.5587175000e+005f, 1.8536379688e+005f, 2.2043595313e+005f,
2.6214400000e+005f, 3.1174350000e+005f, 3.7072759375e+005f, 4.4087190625e+005f,
5.2428800000e+005f, 6.2348700000e+005f, 7.4145518750e+005f, 8.8174381250e+005f,
1.0485760000e+006f, 1.2469740000e+006f, 1.4829103750e+006f, 1.7634876250e+006f,
2.0971520000e+006f, 2.4939480000e+006f, 2.9658207500e+006f, 3.5269752500e+006f,
4.1943040000e+006f, 4.9878960000e+006f, 5.9316415000e+006f, 7.0539505000e+006f,
8.3886080000e+006f, 9.9757920000e+006f, 1.1863283000e+007f, 1.4107901000e+007f,
1.6777216000e+007f, 1.9951584000e+007f, 2.3726566000e+007f, 2.8215802000e+007f,
3.3554432000e+007f, 3.9903168000e+007f, 4.7453132000e+007f, 5.6431604000e+007f,
6.7108864000e+007f, 7.9806336000e+007f,
};
/*
for(scalefact_scale=0; scalefact_scale<2; scalefact_scale++) {
for(preemp=0; preemp<4; preemp++) {
for(scalefac=0; scalefac<32; scalefac++) {
ls[scalefact_scale][preemp][scalefac] = (float)pow(2.0, -0.5*(1+scalefact_scale)*(scalefac + preemp));
}
}
}
*/
const float look_scale[2][4][32] = {
{
{
1.0000000000e+000f, 7.0710676908e-001f, 5.0000000000e-001f, 3.5355338454e-001f,
2.5000000000e-001f, 1.7677669227e-001f, 1.2500000000e-001f, 8.8388346136e-002f,
6.2500000000e-002f, 4.4194173068e-002f, 3.1250000000e-002f, 2.2097086534e-002f,
1.5625000000e-002f, 1.1048543267e-002f, 7.8125000000e-003f, 5.5242716335e-003f,
3.9062500000e-003f, 2.7621358167e-003f, 1.9531250000e-003f, 1.3810679084e-003f,
9.7656250000e-004f, 6.9053395418e-004f, 4.8828125000e-004f, 3.4526697709e-004f,
2.4414062500e-004f, 1.7263348855e-004f, 1.2207031250e-004f, 8.6316744273e-005f,
6.1035156250e-005f, 4.3158372137e-005f, 3.0517578125e-005f, 2.1579186068e-005f,
},
{
7.0710676908e-001f, 5.0000000000e-001f, 3.5355338454e-001f, 2.5000000000e-001f,
1.7677669227e-001f, 1.2500000000e-001f, 8.8388346136e-002f, 6.2500000000e-002f,
4.4194173068e-002f, 3.1250000000e-002f, 2.2097086534e-002f, 1.5625000000e-002f,
1.1048543267e-002f, 7.8125000000e-003f, 5.5242716335e-003f, 3.9062500000e-003f,
2.7621358167e-003f, 1.9531250000e-003f, 1.3810679084e-003f, 9.7656250000e-004f,
6.9053395418e-004f, 4.8828125000e-004f, 3.4526697709e-004f, 2.4414062500e-004f,
1.7263348855e-004f, 1.2207031250e-004f, 8.6316744273e-005f, 6.1035156250e-005f,
4.3158372137e-005f, 3.0517578125e-005f, 2.1579186068e-005f, 1.5258789063e-005f,
},
{
5.0000000000e-001f, 3.5355338454e-001f, 2.5000000000e-001f, 1.7677669227e-001f,
1.2500000000e-001f, 8.8388346136e-002f, 6.2500000000e-002f, 4.4194173068e-002f,
3.1250000000e-002f, 2.2097086534e-002f, 1.5625000000e-002f, 1.1048543267e-002f,
7.8125000000e-003f, 5.5242716335e-003f, 3.9062500000e-003f, 2.7621358167e-003f,
1.9531250000e-003f, 1.3810679084e-003f, 9.7656250000e-004f, 6.9053395418e-004f,
4.8828125000e-004f, 3.4526697709e-004f, 2.4414062500e-004f, 1.7263348855e-004f,
1.2207031250e-004f, 8.6316744273e-005f, 6.1035156250e-005f, 4.3158372137e-005f,
3.0517578125e-005f, 2.1579186068e-005f, 1.5258789063e-005f, 1.0789593034e-005f,
},
{
3.5355338454e-001f, 2.5000000000e-001f, 1.7677669227e-001f, 1.2500000000e-001f,
8.8388346136e-002f, 6.2500000000e-002f, 4.4194173068e-002f, 3.1250000000e-002f,
2.2097086534e-002f, 1.5625000000e-002f, 1.1048543267e-002f, 7.8125000000e-003f,
5.5242716335e-003f, 3.9062500000e-003f, 2.7621358167e-003f, 1.9531250000e-003f,
1.3810679084e-003f, 9.7656250000e-004f, 6.9053395418e-004f, 4.8828125000e-004f,
3.4526697709e-004f, 2.4414062500e-004f, 1.7263348855e-004f, 1.2207031250e-004f,
8.6316744273e-005f, 6.1035156250e-005f, 4.3158372137e-005f, 3.0517578125e-005f,
2.1579186068e-005f, 1.5258789063e-005f, 1.0789593034e-005f, 7.6293945313e-006f,
}
},
{
{
1.0000000000e+000f, 5.0000000000e-001f, 2.5000000000e-001f, 1.2500000000e-001f,
6.2500000000e-002f, 3.1250000000e-002f, 1.5625000000e-002f, 7.8125000000e-003f,
3.9062500000e-003f, 1.9531250000e-003f, 9.7656250000e-004f, 4.8828125000e-004f,
2.4414062500e-004f, 1.2207031250e-004f, 6.1035156250e-005f, 3.0517578125e-005f,
1.5258789063e-005f, 7.6293945313e-006f, 3.8146972656e-006f, 1.9073486328e-006f,
9.5367431641e-007f, 4.7683715820e-007f, 2.3841857910e-007f, 1.1920928955e-007f,
5.9604644775e-008f, 2.9802322388e-008f, 1.4901161194e-008f, 7.4505805969e-009f,
3.7252902985e-009f, 1.8626451492e-009f, 9.3132257462e-010f, 4.6566128731e-010f,
},
{
5.0000000000e-001f, 2.5000000000e-001f, 1.2500000000e-001f, 6.2500000000e-002f,
3.1250000000e-002f, 1.5625000000e-002f, 7.8125000000e-003f, 3.9062500000e-003f,
1.9531250000e-003f, 9.7656250000e-004f, 4.8828125000e-004f, 2.4414062500e-004f,
1.2207031250e-004f, 6.1035156250e-005f, 3.0517578125e-005f, 1.5258789063e-005f,
7.6293945313e-006f, 3.8146972656e-006f, 1.9073486328e-006f, 9.5367431641e-007f,
4.7683715820e-007f, 2.3841857910e-007f, 1.1920928955e-007f, 5.9604644775e-008f,
2.9802322388e-008f, 1.4901161194e-008f, 7.4505805969e-009f, 3.7252902985e-009f,
1.8626451492e-009f, 9.3132257462e-010f, 4.6566128731e-010f, 2.3283064365e-010f,
},
{
2.5000000000e-001f, 1.2500000000e-001f, 6.2500000000e-002f, 3.1250000000e-002f,
1.5625000000e-002f, 7.8125000000e-003f, 3.9062500000e-003f, 1.9531250000e-003f,
9.7656250000e-004f, 4.8828125000e-004f, 2.4414062500e-004f, 1.2207031250e-004f,
6.1035156250e-005f, 3.0517578125e-005f, 1.5258789063e-005f, 7.6293945313e-006f,
3.8146972656e-006f, 1.9073486328e-006f, 9.5367431641e-007f, 4.7683715820e-007f,
2.3841857910e-007f, 1.1920928955e-007f, 5.9604644775e-008f, 2.9802322388e-008f,
1.4901161194e-008f, 7.4505805969e-009f, 3.7252902985e-009f, 1.8626451492e-009f,
9.3132257462e-010f, 4.6566128731e-010f, 2.3283064365e-010f, 1.1641532183e-010f,
},
{
1.2500000000e-001f, 6.2500000000e-002f, 3.1250000000e-002f, 1.5625000000e-002f,
7.8125000000e-003f, 3.9062500000e-003f, 1.9531250000e-003f, 9.7656250000e-004f,
4.8828125000e-004f, 2.4414062500e-004f, 1.2207031250e-004f, 6.1035156250e-005f,
3.0517578125e-005f, 1.5258789063e-005f, 7.6293945313e-006f, 3.8146972656e-006f,
1.9073486328e-006f, 9.5367431641e-007f, 4.7683715820e-007f, 2.3841857910e-007f,
1.1920928955e-007f, 5.9604644775e-008f, 2.9802322388e-008f, 1.4901161194e-008f,
7.4505805969e-009f, 3.7252902985e-009f, 1.8626451492e-009f, 9.3132257462e-010f,
4.6566128731e-010f, 2.3283064365e-010f, 1.1641532183e-010f, 5.8207660913e-011f,
}
}
};
/* --- iSample**(4/3) lookup, -32<=i<=31 ---
for(i=0;i<64;i++) {
tmp = i-32;
x[i] = (float)( tmp*pow(fabs(tmp), (1.0/3.0)) );
}
*/
const float look_pow[64] = {
-1.0159366608e+002f, -9.7382797241e+001f, -9.3216972351e+001f, -8.9097190857e+001f,
-8.5024490356e+001f, -8.1000000000e+001f, -7.7024894714e+001f, -7.3100440979e+001f,
-6.9227981567e+001f, -6.5408943176e+001f, -6.1644866943e+001f, -5.7937408447e+001f,
-5.4288352966e+001f, -5.0699630737e+001f, -4.7173343658e+001f, -4.3711788177e+001f,
-4.0317474365e+001f, -3.6993179321e+001f, -3.3741992950e+001f, -3.0567350388e+001f,
-2.7473142624e+001f, -2.4463781357e+001f, -2.1544347763e+001f, -1.8720754623e+001f,
-1.6000000000e+001f, -1.3390518188e+001f, -1.0902723312e+001f, -8.5498800278e+000f,
-6.3496041298e+000f, -4.3267488480e+000f, -2.5198421478e+000f, -1.0000000000e+000f,
0.0000000000e+000f, 1.0000000000e+000f, 2.5198421478e+000f, 4.3267488480e+000f,
6.3496041298e+000f, 8.5498800278e+000f, 1.0902723312e+001f, 1.3390518188e+001f,
1.6000000000e+001f, 1.8720754623e+001f, 2.1544347763e+001f, 2.4463781357e+001f,
2.7473142624e+001f, 3.0567350388e+001f, 3.3741992950e+001f, 3.6993179321e+001f,
4.0317474365e+001f, 4.3711788177e+001f, 4.7173343658e+001f, 5.0699630737e+001f,
5.4288352966e+001f, 5.7937408447e+001f, 6.1644866943e+001f, 6.5408943176e+001f,
6.9227981567e+001f, 7.3100440979e+001f, 7.7024894714e+001f, 8.1000000000e+001f,
8.5024490356e+001f, 8.9097190857e+001f, 9.3216972351e+001f, 9.7382797241e+001f,
};
/* -- pow(2.0, -0.25*8.0*subblock_gain) 3 bits --
for(i=0;i<8;i++) {
x[i] = (float)pow(2.0, 0.25 * -8.0 * i );
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