ref: 7218a569ea0124a0a25dffd3e93b91bde67bdca7
dir: /amr-wb/c4t64fx.c/
/*------------------------------------------------------------------------*
* C4T64FX.C *
*------------------------------------------------------------------------*
* Performs algebraic codebook search for higher modes *
*------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*
* Function ACELP_4t64_fx() *
* ~~~~~~~~~~~~~~~~~~~~~~~~~ *
* 20, 36, 44, 52, 64, 72, 88 bits algebraic codebook. *
* 4 tracks x 16 positions per track = 64 samples. *
* *
* 20 bits --> 4 pulses in a frame of 64 samples. *
* 36 bits --> 8 pulses in a frame of 64 samples. *
* 44 bits --> 10 pulses in a frame of 64 samples. *
* 52 bits --> 12 pulses in a frame of 64 samples. *
* 64 bits --> 16 pulses in a frame of 64 samples. *
* 72 bits --> 18 pulses in a frame of 64 samples. *
* 88 bits --> 24 pulses in a frame of 64 samples. *
* *
* All pulses can have two (2) possible amplitudes: +1 or -1. *
* Each pulse can have sixteen (16) possible positions. *
*-----------------------------------------------------------------------*/
#include "typedef.h"
#include "basic_op.h"
#include "math_op.h"
#include "acelp.h"
#include "count.h"
#include "cnst.h"
#include "q_pulse.h"
static Word16 tipos[36] = {
0, 1, 2, 3, /* starting point &ipos[0], 1st iter */
1, 2, 3, 0, /* starting point &ipos[4], 2nd iter */
2, 3, 0, 1, /* starting point &ipos[8], 3rd iter */
3, 0, 1, 2, /* starting point &ipos[12], 4th iter */
0, 1, 2, 3,
1, 2, 3, 0,
2, 3, 0, 1,
3, 0, 1, 2,
0, 1, 2, 3}; /* end point for 24 pulses &ipos[35], 4th iter */
#define NB_PULSE_MAX 24
#define L_SUBFR 64
#define NB_TRACK 4
#define STEP 4
#define NB_POS 16
#define MSIZE 256
#define NB_MAX 8
#define NPMAXPT ((NB_PULSE_MAX+NB_TRACK-1)/NB_TRACK)
/* locals functions */
static void cor_h_vec(
Word16 h[], /* (i) scaled impulse response */
Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */
Word16 track, /* (i) track to use */
Word16 sign[], /* (i) sign vector */
Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */
Word16 cor[] /* (o) result of correlation (NB_POS elements) */
);
static void search_ixiy(
Word16 nb_pos_ix, /* (i) nb of pos for pulse 1 (1..8) */
Word16 track_x, /* (i) track of pulse 1 */
Word16 track_y, /* (i) track of pulse 2 */
Word16 * ps, /* (i/o) correlation of all fixed pulses */
Word16 * alp, /* (i/o) energy of all fixed pulses */
Word16 * ix, /* (o) position of pulse 1 */
Word16 * iy, /* (o) position of pulse 2 */
Word16 dn[], /* (i) corr. between target and h[] */
Word16 dn2[], /* (i) vector of selected positions */
Word16 cor_x[], /* (i) corr. of pulse 1 with fixed pulses */
Word16 cor_y[], /* (i) corr. of pulse 2 with fixed pulses */
Word16 rrixiy[][MSIZE] /* (i) corr. of pulse 1 with pulse 2 */
);
void ACELP_4t64_fx(
Word16 dn[], /* (i) <12b : correlation between target x[] and H[] */
Word16 cn[], /* (i) <12b : residual after long term prediction */
Word16 H[], /* (i) Q12: impulse response of weighted synthesis filter */
Word16 code[], /* (o) Q9 : algebraic (fixed) codebook excitation */
Word16 y[], /* (o) Q9 : filtered fixed codebook excitation */
Word16 nbbits, /* (i) : 20, 36, 44, 52, 64, 72 or 88 bits */
Word16 ser_size, /* (i) : bit rate */
Word16 _index[] /* (o) : index (20): 5+5+5+5 = 20 bits. */
/* (o) : index (36): 9+9+9+9 = 36 bits. */
/* (o) : index (44): 13+9+13+9 = 44 bits. */
/* (o) : index (52): 13+13+13+13 = 52 bits. */
/* (o) : index (64): 2+2+2+2+14+14+14+14 = 64 bits. */
/* (o) : index (72): 10+2+10+2+10+14+10+14 = 72 bits. */
/* (o) : index (88): 11+11+11+11+11+11+11+11 = 88 bits. */
)
{
Word16 i, j, k, st, ix, iy, pos, index, track, nb_pulse, nbiter;
Word16 psk, ps, alpk, alp, val, k_cn, k_dn, exp;
Word16 *p0, *p1, *p2, *p3, *psign;
Word16 *h, *h_inv, *ptr_h1, *ptr_h2, *ptr_hf, h_shift;
Word32 s, cor, L_tmp, L_index;
Word16 dn2[L_SUBFR], sign[L_SUBFR], vec[L_SUBFR];
Word16 ind[NPMAXPT * NB_TRACK];
Word16 codvec[NB_PULSE_MAX], nbpos[10];
Word16 cor_x[NB_POS], cor_y[NB_POS], pos_max[NB_TRACK];
Word16 h_buf[4 * L_SUBFR];
Word16 rrixix[NB_TRACK][NB_POS], rrixiy[NB_TRACK][MSIZE];
Word16 ipos[NB_PULSE_MAX];
switch (nbbits)
{
case 20: /* 20 bits, 4 pulses, 4 tracks */
nbiter = 4; move16(); /* 4x16x16=1024 loop */
alp = 8192; move16(); /* alp = 2.0 (Q12) */
nb_pulse = 4; move16();
nbpos[0] = 4; move16();
nbpos[1] = 8; move16();
break;
case 36: /* 36 bits, 8 pulses, 4 tracks */
nbiter = 4; move16(); /* 4x20x16=1280 loop */
alp = 4096; move16(); /* alp = 1.0 (Q12) */
nb_pulse = 8; move16();
nbpos[0] = 4; move16();
nbpos[1] = 8; move16();
nbpos[2] = 8; move16();
break;
case 44: /* 44 bits, 10 pulses, 4 tracks */
nbiter = 4; move16(); /* 4x26x16=1664 loop */
alp = 4096; move16(); /* alp = 1.0 (Q12) */
nb_pulse = 10; move16();
nbpos[0] = 4; move16();
nbpos[1] = 6; move16();
nbpos[2] = 8; move16();
nbpos[3] = 8; move16();
break;
case 52: /* 52 bits, 12 pulses, 4 tracks */
nbiter = 4; move16(); /* 4x26x16=1664 loop */
alp = 4096; move16(); /* alp = 1.0 (Q12) */
nb_pulse = 12; move16();
nbpos[0] = 4; move16();
nbpos[1] = 6; move16();
nbpos[2] = 8; move16();
nbpos[3] = 8; move16();
break;
case 64: /* 64 bits, 16 pulses, 4 tracks */
nbiter = 3; move16(); /* 3x36x16=1728 loop */
alp = 3277; move16(); /* alp = 0.8 (Q12) */
nb_pulse = 16; move16();
nbpos[0] = 4; move16();
nbpos[1] = 4; move16();
nbpos[2] = 6; move16();
nbpos[3] = 6; move16();
nbpos[4] = 8; move16();
nbpos[5] = 8; move16();
break;
case 72: /* 72 bits, 18 pulses, 4 tracks */
nbiter = 3; move16(); /* 3x35x16=1680 loop */
alp = 3072; move16(); /* alp = 0.75 (Q12) */
nb_pulse = 18; move16();
nbpos[0] = 2; move16();
nbpos[1] = 3; move16();
nbpos[2] = 4; move16();
nbpos[3] = 5; move16();
nbpos[4] = 6; move16();
nbpos[5] = 7; move16();
nbpos[6] = 8; move16();
break;
case 88: /* 88 bits, 24 pulses, 4 tracks */
test();move16();
if (sub(ser_size, 462) > 0)
nbiter = 1;
else
nbiter = 2; /* 2x53x16=1696 loop */
alp = 2048; move16(); /* alp = 0.5 (Q12) */
nb_pulse = 24; move16();
nbpos[0] = 2; move16();
nbpos[1] = 2; move16();
nbpos[2] = 3; move16();
nbpos[3] = 4; move16();
nbpos[4] = 5; move16();
nbpos[5] = 6; move16();
nbpos[6] = 7; move16();
nbpos[7] = 8; move16();
nbpos[8] = 8; move16();
nbpos[9] = 8; move16();
break;
default:
nbiter = 0;
alp = 0;
nb_pulse = 0;
}
for (i = 0; i < nb_pulse; i++)
{
codvec[i] = i; move16();
}
/*----------------------------------------------------------------*
* Find sign for each pulse position. *
*----------------------------------------------------------------*/
/* calculate energy for normalization of cn[] and dn[] */
/* set k_cn = 32..32767 (ener_cn = 2^30..256-0) */
s = Dot_product12(cn, cn, L_SUBFR, &exp);
Isqrt_n(&s, &exp);
s = L_shl(s, add(exp, 5)); /* saturation can occur here */
k_cn = round(s);
/* set k_dn = 32..512 (ener_dn = 2^30..2^22) */
s = Dot_product12(dn, dn, L_SUBFR, &exp);
Isqrt_n(&s, &exp);
k_dn = round(L_shl(s, add(exp, 5 + 3))); /* k_dn = 256..4096 */
k_dn = mult_r(alp, k_dn); /* alp in Q12 */
/* mix normalized cn[] and dn[] */
for (i = 0; i < L_SUBFR; i++)
{
s = L_mac(L_mult(k_cn, cn[i]), k_dn, dn[i]);
dn2[i] = extract_h(L_shl(s, 8)); move16();
}
/* set sign according to dn2[] = k_cn*cn[] + k_dn*dn[] */
for (k = 0; k < NB_TRACK; k++)
{
for (i = k; i < L_SUBFR; i += STEP)
{
val = dn[i]; move16();
ps = dn2[i]; move16();
test();
if (ps >= 0)
{
sign[i] = 32767; move16(); /* sign = +1 (Q12) */
vec[i] = -32768; move16();
} else
{
sign[i] = -32768; move16(); /* sign = -1 (Q12) */
vec[i] = 32767; move16();
val = negate(val);
ps = negate(ps);
}
dn[i] = val; move16(); /* modify dn[] according to the fixed sign */
dn2[i] = ps; move16(); /* dn2[] = mix of dn[] and cn[] */
}
}
/*----------------------------------------------------------------*
* Select NB_MAX position per track according to max of dn2[]. *
*----------------------------------------------------------------*/
pos = 0;
for (i = 0; i < NB_TRACK; i++)
{
for (k = 0; k < NB_MAX; k++)
{
ps = -1; move16();
for (j = i; j < L_SUBFR; j += STEP)
{
test();
if (sub(dn2[j], ps) > 0)
{
ps = dn2[j]; move16();
pos = j; move16();
}
}
move16();
dn2[pos] = sub(k, NB_MAX); /* dn2 < 0 when position is selected */
test();
if (k == 0)
{
pos_max[i] = pos; move16();
}
}
}
/*--------------------------------------------------------------*
* Scale h[] to avoid overflow and to get maximum of precision *
* on correlation. *
* *
* Maximum of h[] (h[0]) is fixed to 2048 (MAX16 / 16). *
* ==> This allow addition of 16 pulses without saturation. *
* *
* Energy worst case (on resonant impulse response), *
* - energy of h[] is approximately MAX/16. *
* - During search, the energy is divided by 8 to avoid *
* overflow on "alp". (energy of h[] = MAX/128). *
* ==> "alp" worst case detected is 22854 on sinusoidal wave. *
*--------------------------------------------------------------*/
/* impulse response buffer for fast computation */
h = h_buf; move16();
h_inv = h_buf + (2 * L_SUBFR); move16();
for (i = 0; i < L_SUBFR; i++)
{
*h++ = 0; move16();
*h_inv++ = 0; move16();
}
/* scale h[] down (/2) when energy of h[] is high with many pulses used */
L_tmp = 0;
for (i = 0; i < L_SUBFR; i++)
L_tmp = L_mac(L_tmp, H[i], H[i]);
val = extract_h(L_tmp);
h_shift = 0; move16();
test();test();
if ((sub(nb_pulse, 12) >= 0) && (sub(val, 1024) > 0))
{
h_shift = 1; move16();
}
for (i = 0; i < L_SUBFR; i++)
{
h[i] = shr(H[i], h_shift); move16();
h_inv[i] = negate(h[i]); move16();
}
/*------------------------------------------------------------*
* Compute rrixix[][] needed for the codebook search. *
* This algorithm compute impulse response energy of all *
* positions (16) in each track (4). Total = 4x16 = 64. *
*------------------------------------------------------------*/
/* storage order --> i3i3, i2i2, i1i1, i0i0 */
/* Init pointers to last position of rrixix[] */
p0 = &rrixix[0][NB_POS - 1]; move16();
p1 = &rrixix[1][NB_POS - 1]; move16();
p2 = &rrixix[2][NB_POS - 1]; move16();
p3 = &rrixix[3][NB_POS - 1]; move16();
ptr_h1 = h; move16();
cor = 0x00008000L; move32(); /* for rounding */
for (i = 0; i < NB_POS; i++)
{
cor = L_mac(cor, *ptr_h1, *ptr_h1);
ptr_h1++;
*p3-- = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h1);
ptr_h1++;
*p2-- = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h1);
ptr_h1++;
*p1-- = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h1);
ptr_h1++;
*p0-- = extract_h(cor); move16();
}
/*------------------------------------------------------------*
* Compute rrixiy[][] needed for the codebook search. *
* This algorithm compute correlation between 2 pulses *
* (2 impulses responses) in 4 possible adjacents tracks. *
* (track 0-1, 1-2, 2-3 and 3-0). Total = 4x16x16 = 1024. *
*------------------------------------------------------------*/
/* storage order --> i2i3, i1i2, i0i1, i3i0 */
pos = MSIZE - 1; move16();
ptr_hf = h + 1; move16();
for (k = 0; k < NB_POS; k++)
{
p3 = &rrixiy[2][pos]; move16();
p2 = &rrixiy[1][pos]; move16();
p1 = &rrixiy[0][pos]; move16();
p0 = &rrixiy[3][pos - NB_POS]; move16();
cor = 0x00008000L; move32(); /* for rounding */
ptr_h1 = h; move16();
ptr_h2 = ptr_hf; move16();
for (i = add(k, 1); i < NB_POS; i++)
{
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p2 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p1 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p0 = extract_h(cor); move16();
p3 -= (NB_POS + 1);
p2 -= (NB_POS + 1);
p1 -= (NB_POS + 1);
p0 -= (NB_POS + 1);
}
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p2 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p1 = extract_h(cor); move16();
pos -= NB_POS;
ptr_hf += STEP;
}
/* storage order --> i3i0, i2i3, i1i2, i0i1 */
pos = MSIZE - 1; move16();
ptr_hf = h + 3; move16();
for (k = 0; k < NB_POS; k++)
{
p3 = &rrixiy[3][pos]; move16();
p2 = &rrixiy[2][pos - 1]; move16();
p1 = &rrixiy[1][pos - 1]; move16();
p0 = &rrixiy[0][pos - 1]; move16();
cor = 0x00008000L; move32(); /* for rounding */
ptr_h1 = h; move16();
ptr_h2 = ptr_hf; move16();
for (i = add(k, 1); i < NB_POS; i++)
{
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p2 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p1 = extract_h(cor); move16();
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p0 = extract_h(cor); move16();
p3 -= (NB_POS + 1);
p2 -= (NB_POS + 1);
p1 -= (NB_POS + 1);
p0 -= (NB_POS + 1);
}
cor = L_mac(cor, *ptr_h1, *ptr_h2);
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor); move16();
pos--;
ptr_hf += STEP;
}
/*------------------------------------------------------------*
* Modification of rrixiy[][] to take signs into account. *
*------------------------------------------------------------*/
p0 = &rrixiy[0][0]; move16();
for (k = 0; k < NB_TRACK; k++)
{
for (i = k; i < L_SUBFR; i += STEP)
{
psign = sign; move16();
test();
if (psign[i] < 0)
{
psign = vec; move16();
}
for (j = (Word16) ((k + 1) % NB_TRACK); j < L_SUBFR; j += STEP)
{
*p0 = mult(*p0, psign[j]); move16();
p0++;
}
}
}
/*-------------------------------------------------------------------*
* Deep first search *
*-------------------------------------------------------------------*/
psk = -1; move16();
alpk = 1; move16();
for (k = 0; k < nbiter; k++)
{
for (i = 0; i < nb_pulse; i++)
ipos[i] = tipos[(k * 4) + i];
test();test();test();
if (sub(nbbits, 20) == 0)
{
pos = 0; move16();
ps = 0; move16();
alp = 0; move16();
for (i = 0; i < L_SUBFR; i++)
{
vec[i] = 0; move16();
}
} else if ((sub(nbbits, 36) == 0) || (sub(nbbits, 44) == 0))
{
/* first stage: fix 2 pulses */
pos = 2;
ix = ind[0] = pos_max[ipos[0]];move16();move16();
iy = ind[1] = pos_max[ipos[1]];move16();move16();
ps = add(dn[ix], dn[iy]);
i = shr(ix, 2); /* ix / STEP */
j = shr(iy, 2); /* iy / STEP */
s = L_mult(rrixix[ipos[0]][i], 4096);
s = L_mac(s, rrixix[ipos[1]][j], 4096);
i = add(shl(i, 4), j); /* (ix/STEP)*NB_POS + (iy/STEP) */
s = L_mac(s, rrixiy[ipos[0]][i], 8192);
alp = round(s);
test();move16();move16();
if (sign[ix] < 0)
p0 = h_inv - ix;
else
p0 = h - ix;
test();move16();move16();
if (sign[iy] < 0)
p1 = h_inv - iy;
else
p1 = h - iy;
for (i = 0; i < L_SUBFR; i++)
{
vec[i] = add(*p0++, *p1++);move16();
}
test();
if (sub(nbbits, 44) == 0)
{
ipos[8] = 0; move16();
ipos[9] = 1; move16();
}
} else
{
/* first stage: fix 4 pulses */
pos = 4;
ix = ind[0] = pos_max[ipos[0]]; move16();move16();
iy = ind[1] = pos_max[ipos[1]]; move16();move16();
i = ind[2] = pos_max[ipos[2]]; move16();move16();
j = ind[3] = pos_max[ipos[3]]; move16();move16();
ps = add(add(add(dn[ix], dn[iy]), dn[i]), dn[j]);
test();move16();move16();
if (sign[ix] < 0)
p0 = h_inv - ix;
else
p0 = h - ix;
test();move16();move16();
if (sign[iy] < 0)
p1 = h_inv - iy;
else
p1 = h - iy;
test();move16();move16();
if (sign[i] < 0)
p2 = h_inv - i;
else
p2 = h - i;
test();move16();move16();
if (sign[j] < 0)
p3 = h_inv - j;
else
p3 = h - j;
for (i = 0; i < L_SUBFR; i++)
{
vec[i] = add(add(add(*p0++, *p1++), *p2++), *p3++);
move16();
}
L_tmp = 0L; move32();
for (i = 0; i < L_SUBFR; i++)
L_tmp = L_mac(L_tmp, vec[i], vec[i]);
alp = round(L_shr(L_tmp, 3));
if (sub(nbbits, 72) == 0)
{
ipos[16] = 0; move16();
ipos[17] = 1; move16();
}
}
/* other stages of 2 pulses */
for (j = pos, st = 0; j < nb_pulse; j += 2, st++)
{
/*--------------------------------------------------*
* Calculate correlation of all possible positions *
* of the next 2 pulses with previous fixed pulses. *
* Each pulse can have 16 possible positions. *
*--------------------------------------------------*/
cor_h_vec(h, vec, ipos[j], sign, rrixix, cor_x);
cor_h_vec(h, vec, ipos[j + 1], sign, rrixix, cor_y);
/*--------------------------------------------------*
* Find best positions of 2 pulses. *
*--------------------------------------------------*/
search_ixiy(nbpos[st], ipos[j], ipos[j + 1], &ps, &alp,
&ix, &iy, dn, dn2, cor_x, cor_y, rrixiy);
ind[j] = ix; move16();
ind[j + 1] = iy; move16();
test();move16();move16();
if (sign[ix] < 0)
p0 = h_inv - ix;
else
p0 = h - ix;
test();move16();move16();
if (sign[iy] < 0)
p1 = h_inv - iy;
else
p1 = h - iy;
for (i = 0; i < L_SUBFR; i++)
{
vec[i] = add(vec[i], add(*p0++, *p1++)); /* can saturate here. */
move16();
}
}
/* memorise the best codevector */
ps = mult(ps, ps);
s = L_msu(L_mult(alpk, ps), psk, alp);
test();
if (s > 0)
{
psk = ps; move16();
alpk = alp; move16();
for (i = 0; i < nb_pulse; i++)
{
codvec[i] = ind[i]; move16();
}
for (i = 0; i < L_SUBFR; i++)
{
y[i] = vec[i]; move16();
}
}
}
/*-------------------------------------------------------------------*
* Build the codeword, the filtered codeword and index of codevector.*
*-------------------------------------------------------------------*/
for (i = 0; i < NPMAXPT * NB_TRACK; i++)
{
ind[i] = -1; move16();
}
for (i = 0; i < L_SUBFR; i++)
{
code[i] = 0; move16();
y[i] = shr_r(y[i], 3); move16(); /* Q12 to Q9 */
}
val = shr(512, h_shift); /* codeword in Q9 format */
for (k = 0; k < nb_pulse; k++)
{
i = codvec[k]; move16(); /* read pulse position */
j = sign[i]; move16(); /* read sign */
index = shr(i, 2); /* index = pos of pulse (0..15) */
track = (Word16) (i & 0x03); logic16(); /* track = i % NB_TRACK (0..3) */
if (j > 0)
{
code[i] = add(code[i], val); move16();
codvec[k] = add(codvec[k], (2 * L_SUBFR)); move16();
} else
{
code[i] = sub(code[i], val); move16();
index = add(index, NB_POS); move16();
}
i = extract_l(L_shr(L_mult(track, NPMAXPT), 1));
test();move16();
while (ind[i] >= 0)
{
i = add(i, 1);
}
ind[i] = index; move16();
}
k = 0; move16();
/* Build index of codevector */
test();test();test();test();test();test();test();
if (sub(nbbits, 20) == 0)
{
for (track = 0; track < NB_TRACK; track++)
{
_index[track] = extract_l(quant_1p_N1(ind[k], 4));
k += NPMAXPT;
}
} else if (sub(nbbits, 36) == 0)
{
for (track = 0; track < NB_TRACK; track++)
{
_index[track] = extract_l(quant_2p_2N1(ind[k], ind[k + 1], 4));
k += NPMAXPT;
}
} else if (sub(nbbits, 44) == 0)
{
for (track = 0; track < NB_TRACK - 2; track++)
{
_index[track] = extract_l(quant_3p_3N1(ind[k], ind[k + 1], ind[k + 2], 4));
k += NPMAXPT;
}
for (track = 2; track < NB_TRACK; track++)
{
_index[track] = extract_l(quant_2p_2N1(ind[k], ind[k + 1], 4));
k += NPMAXPT;
}
} else if (sub(nbbits, 52) == 0)
{
for (track = 0; track < NB_TRACK; track++)
{
_index[track] = extract_l(quant_3p_3N1(ind[k], ind[k + 1], ind[k + 2], 4));
k += NPMAXPT;
}
} else if (sub(nbbits, 64) == 0)
{
for (track = 0; track < NB_TRACK; track++)
{
L_index = quant_4p_4N(&ind[k], 4);
_index[track] = extract_l(L_shr(L_index, 14) & 3);
_index[track + NB_TRACK] = extract_l(L_index & 0x3FFF);
k += NPMAXPT;
}
} else if (sub(nbbits, 72) == 0)
{
for (track = 0; track < NB_TRACK - 2; track++)
{
L_index = quant_5p_5N(&ind[k], 4);
_index[track] = extract_l(L_shr(L_index, 10) & 0x03FF);
_index[track + NB_TRACK] = extract_l(L_index & 0x03FF);
k += NPMAXPT;
}
for (track = 2; track < NB_TRACK; track++)
{
L_index = quant_4p_4N(&ind[k], 4);
_index[track] = extract_l(L_shr(L_index, 14) & 3);
_index[track + NB_TRACK] = extract_l(L_index & 0x3FFF);
k += NPMAXPT;
}
} else if (sub(nbbits, 88) == 0)
{
for (track = 0; track < NB_TRACK; track++)
{
L_index = quant_6p_6N_2(&ind[k], 4);
_index[track] = extract_l(L_shr(L_index, 11) & 0x07FF);
_index[track + NB_TRACK] = extract_l(L_index & 0x07FF);
k += NPMAXPT;
}
}
return;
}
/*-------------------------------------------------------------------*
* Function cor_h_vec() *
* ~~~~~~~~~~~~~~~~~~~~~ *
* Compute correlations of h[] with vec[] for the specified track. *
*-------------------------------------------------------------------*/
static void cor_h_vec(
Word16 h[], /* (i) scaled impulse response */
Word16 vec[], /* (i) scaled vector (/8) to correlate with h[] */
Word16 track, /* (i) track to use */
Word16 sign[], /* (i) sign vector */
Word16 rrixix[][NB_POS], /* (i) correlation of h[x] with h[x] */
Word16 cor[] /* (o) result of correlation (NB_POS elements) */
)
{
Word16 i, j, pos, corr;
Word16 *p0, *p1, *p2;
Word32 L_sum;
p0 = rrixix[track]; move16();
pos = track; move16();
for (i = 0; i < NB_POS; i++, pos += STEP)
{
L_sum = 0L; move32();
p1 = h; move16();
p2 = &vec[pos]; move16();
for (j = pos; j < L_SUBFR; j++)
L_sum = L_mac(L_sum, *p1++, *p2++);
L_sum = L_shl(L_sum, 1);
corr = round(L_sum);
cor[i] = add(mult(corr, sign[pos]), *p0++); move16();
}
return;
}
/*-------------------------------------------------------------------*
* Function search_ixiy() *
* ~~~~~~~~~~~~~~~~~~~~~~~ *
* Find the best positions of 2 pulses in a subframe. *
*-------------------------------------------------------------------*/
static void search_ixiy(
Word16 nb_pos_ix, /* (i) nb of pos for pulse 1 (1..8) */
Word16 track_x, /* (i) track of pulse 1 */
Word16 track_y, /* (i) track of pulse 2 */
Word16 * ps, /* (i/o) correlation of all fixed pulses */
Word16 * alp, /* (i/o) energy of all fixed pulses */
Word16 * ix, /* (o) position of pulse 1 */
Word16 * iy, /* (o) position of pulse 2 */
Word16 dn[], /* (i) corr. between target and h[] */
Word16 dn2[], /* (i) vector of selected positions */
Word16 cor_x[], /* (i) corr. of pulse 1 with fixed pulses */
Word16 cor_y[], /* (i) corr. of pulse 2 with fixed pulses */
Word16 rrixiy[][MSIZE] /* (i) corr. of pulse 1 with pulse 2 */
)
{
Word16 x, y, pos, thres_ix;
Word16 ps1, ps2, sq, sqk;
Word16 alp_16, alpk;
Word16 *p0, *p1, *p2;
Word32 s, alp0, alp1, alp2;
p0 = cor_x; move16();
p1 = cor_y; move16();
p2 = rrixiy[track_x]; move16();
thres_ix = sub(nb_pos_ix, NB_MAX);
alp0 = L_deposit_h(*alp);
alp0 = L_add(alp0, 0x00008000L); /* for rounding */
sqk = -1; move16();
alpk = 1; move16();
for (x = track_x; x < L_SUBFR; x += STEP)
{
ps1 = add(*ps, dn[x]);
alp1 = L_mac(alp0, *p0++, 4096);
test();
if (sub(dn2[x], thres_ix) < 0)
{
pos = -1; move16();
for (y = track_y; y < L_SUBFR; y += STEP)
{
ps2 = add(ps1, dn[y]);
alp2 = L_mac(alp1, *p1++, 4096);
alp2 = L_mac(alp2, *p2++, 8192);
alp_16 = extract_h(alp2);
sq = mult(ps2, ps2);
s = L_msu(L_mult(alpk, sq), sqk, alp_16);
test();
if (s > 0)
{
sqk = sq; move16();
alpk = alp_16; move16();
pos = y; move16();
}
}
p1 -= NB_POS;
test();
if (pos >= 0)
{
*ix = x; move16();
*iy = pos; move16();
}
} else
{
p2 += NB_POS;
}
}
*ps = add(*ps, add(dn[*ix], dn[*iy])); move16();
*alp = alpk; move16();
return;
}