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acelp_ca.c
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acelp_ca.c
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/* G.729A Version 1.1 Last modified: September 1996 */
/*
ITU-T G.729A Speech Coder ANSI-C Source Code
Copyright (c) 1996,
AT&T, France Telecom, NTT, Universite de Sherbrooke, Lucent Technologies
All rights reserved.
*/
/*---------------------------------------------------------------------------*
* Function ACELP_Code_A() *
* ~~~~~~~~~~~~~~~~~~~~~~~~ *
* Find Algebraic codebook for G.729A *
*--------------------------------------------------------------------------*/
#include "typedef.h"
#include "basic_op.h"
#include "ld8a.h"
/* Constants defined in ld8a.h */
/* L_SUBFR -> Lenght of subframe. */
/* NB_POS -> Number of positions for each pulse. */
/* STEP -> Step betweem position of the same pulse. */
/* MSIZE -> Size of vectors for cross-correlation between two pulses. */
/* local routines definition */
static void Cor_h(
int16_t *H, /* (i) Q12 :Impulse response of filters */
int16_t *rr /* (o) :Correlations of H[] */
);
static int16_t D4i40_17_fast(/*(o) : Index of pulses positions. */
int16_t dn[], /* (i) : Correlations between h[] and Xn[]. */
int16_t *rr, /* (i) : Correlations of impulse response h[]. */
int16_t h[], /* (i) Q12: Impulse response of filters. */
int16_t cod[], /* (o) Q13: Selected algebraic codeword. */
int16_t y[], /* (o) Q12: Filtered algebraic codeword. */
int16_t *sign /* (o) : Signs of 4 pulses. */
);
/*-----------------------------------------------------------------*
* Main ACELP function. *
*-----------------------------------------------------------------*/
int16_t ACELP_Code_A( /* (o) :index of pulses positions */
int16_t x[], /* (i) :Target vector */
int16_t h[], /* (i) Q12 :Inpulse response of filters */
int16_t T0, /* (i) :Pitch lag */
int16_t pitch_sharp, /* (i) Q14 :Last quantized pitch gain */
int16_t code[], /* (o) Q13 :Innovative codebook */
int16_t y[], /* (o) Q12 :Filtered innovative codebook */
int16_t *sign /* (o) :Signs of 4 pulses */
)
{
int16_t i, index, sharp;
int16_t Dn[L_SUBFR];
int16_t rr[DIM_RR];
/*-----------------------------------------------------------------*
* Include fixed-gain pitch contribution into impulse resp. h[] *
* Find correlations of h[] needed for the codebook search. *
*-----------------------------------------------------------------*/
sharp = shl(pitch_sharp, 1); /* From Q14 to Q15 */
if (T0 < L_SUBFR)
for (i = T0; i < L_SUBFR; i++) /* h[i] += pitch_sharp*h[i-T0] */
h[i] = add(h[i], mult(h[i-T0], sharp));
Cor_h(h, rr);
/*-----------------------------------------------------------------*
* Compute correlation of target vector with impulse response. *
*-----------------------------------------------------------------*/
Cor_h_X(h, x, Dn);
/*-----------------------------------------------------------------*
* Find innovative codebook. *
*-----------------------------------------------------------------*/
index = D4i40_17_fast(Dn, rr, h, code, y, sign);
/*-----------------------------------------------------------------*
* Compute innovation vector gain. *
* Include fixed-gain pitch contribution into code[]. *
*-----------------------------------------------------------------*/
if(T0 < L_SUBFR)
for (i = T0; i < L_SUBFR; i++) /* code[i] += pitch_sharp*code[i-T0] */
code[i] = add(code[i], mult(code[i-T0], sharp));
return index;
}
/*--------------------------------------------------------------------------*
* Function Cor_h() *
* ~~~~~~~~~~~~~~~~~ *
* Compute correlations of h[] needed for the codebook search. *
*--------------------------------------------------------------------------*/
static void Cor_h(
int16_t *H, /* (i) Q12 :Impulse response of filters */
int16_t *rr /* (o) :Correlations of H[] */
)
{
int16_t *rri0i0, *rri1i1, *rri2i2, *rri3i3, *rri4i4;
int16_t *rri0i1, *rri0i2, *rri0i3, *rri0i4;
int16_t *rri1i2, *rri1i3, *rri1i4;
int16_t *rri2i3, *rri2i4;
int16_t *p0, *p1, *p2, *p3, *p4;
int16_t *ptr_hd, *ptr_hf, *ptr_h1, *ptr_h2;
int32_t cor;
int16_t i, k, ldec, l_fin_sup, l_fin_inf;
int16_t h[L_SUBFR];
/* Scaling h[] for maximum precision */
cor = 0;
for(i=0; i<L_SUBFR; i++)
cor = L_mac(cor, H[i], H[i]);
if(sub(extract_h(cor),32000) > 0)
{
for(i=0; i<L_SUBFR; i++) {
h[i] = shr(H[i], 1);
}
}
else
{
k = norm_l(cor);
k = shr(k, 1);
for(i=0; i<L_SUBFR; i++) {
h[i] = shl(H[i], k);
}
}
/*------------------------------------------------------------*
* Compute rri0i0[], rri1i1[], rri2i2[], rri3i3 and rri4i4[] *
*------------------------------------------------------------*/
/* Init pointers */
rri0i0 = rr;
rri1i1 = rri0i0 + NB_POS;
rri2i2 = rri1i1 + NB_POS;
rri3i3 = rri2i2 + NB_POS;
rri4i4 = rri3i3 + NB_POS;
rri0i1 = rri4i4 + NB_POS;
rri0i2 = rri0i1 + MSIZE;
rri0i3 = rri0i2 + MSIZE;
rri0i4 = rri0i3 + MSIZE;
rri1i2 = rri0i4 + MSIZE;
rri1i3 = rri1i2 + MSIZE;
rri1i4 = rri1i3 + MSIZE;
rri2i3 = rri1i4 + MSIZE;
rri2i4 = rri2i3 + MSIZE;
p0 = rri0i0 + NB_POS-1; /* Init pointers to last position of rrixix[] */
p1 = rri1i1 + NB_POS-1;
p2 = rri2i2 + NB_POS-1;
p3 = rri3i3 + NB_POS-1;
p4 = rri4i4 + NB_POS-1;
ptr_h1 = h;
cor = 0;
for(i=0; i<NB_POS; i++)
{
cor = L_mac(cor, *ptr_h1, *ptr_h1); ptr_h1++;
*p4-- = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h1); ptr_h1++;
*p3-- = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h1); ptr_h1++;
*p2-- = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h1); ptr_h1++;
*p1-- = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h1); ptr_h1++;
*p0-- = extract_h(cor);
}
/*-----------------------------------------------------------------*
* Compute elements of: rri2i3[], rri1i2[], rri0i1[] and rri0i4[] *
*-----------------------------------------------------------------*/
l_fin_sup = MSIZE-1;
l_fin_inf = l_fin_sup-(int16_t)1;
ldec = NB_POS+1;
ptr_hd = h;
ptr_hf = ptr_hd + 1;
for(k=0; k<NB_POS; k++) {
p3 = rri2i3 + l_fin_sup;
p2 = rri1i2 + l_fin_sup;
p1 = rri0i1 + l_fin_sup;
p0 = rri0i4 + l_fin_inf;
cor = 0;
ptr_h1 = ptr_hd;
ptr_h2 = ptr_hf;
for(i=k+(int16_t)1; i<NB_POS; i++ ) {
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p2 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p1 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p0 = extract_h(cor);
p3 -= ldec;
p2 -= ldec;
p1 -= ldec;
p0 -= ldec;
}
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p2 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p1 = extract_h(cor);
l_fin_sup -= NB_POS;
l_fin_inf--;
ptr_hf += STEP;
}
/*---------------------------------------------------------------------*
* Compute elements of: rri2i4[], rri1i3[], rri0i2[], rri1i4[], rri0i3 *
*---------------------------------------------------------------------*/
ptr_hd = h;
ptr_hf = ptr_hd + 2;
l_fin_sup = MSIZE-1;
l_fin_inf = l_fin_sup-(int16_t)1;
for(k=0; k<NB_POS; k++) {
p4 = rri2i4 + l_fin_sup;
p3 = rri1i3 + l_fin_sup;
p2 = rri0i2 + l_fin_sup;
p1 = rri1i4 + l_fin_inf;
p0 = rri0i3 + l_fin_inf;
cor = 0;
ptr_h1 = ptr_hd;
ptr_h2 = ptr_hf;
for(i=k+(int16_t)1; i<NB_POS; i++ ) {
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p4 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p2 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p1 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p0 = extract_h(cor);
p4 -= ldec;
p3 -= ldec;
p2 -= ldec;
p1 -= ldec;
p0 -= ldec;
}
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p4 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p2 = extract_h(cor);
l_fin_sup -= NB_POS;
l_fin_inf--;
ptr_hf += STEP;
}
/*----------------------------------------------------------------------*
* Compute elements of: rri1i4[], rri0i3[], rri2i4[], rri1i3[], rri0i2 *
*----------------------------------------------------------------------*/
ptr_hd = h;
ptr_hf = ptr_hd + 3;
l_fin_sup = MSIZE-1;
l_fin_inf = l_fin_sup-(int16_t)1;
for(k=0; k<NB_POS; k++) {
p4 = rri1i4 + l_fin_sup;
p3 = rri0i3 + l_fin_sup;
p2 = rri2i4 + l_fin_inf;
p1 = rri1i3 + l_fin_inf;
p0 = rri0i2 + l_fin_inf;
ptr_h1 = ptr_hd;
ptr_h2 = ptr_hf;
cor = 0;
for(i=k+(int16_t)1; i<NB_POS; i++ ) {
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p4 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p2 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p1 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p0 = extract_h(cor);
p4 -= ldec;
p3 -= ldec;
p2 -= ldec;
p1 -= ldec;
p0 -= ldec;
}
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p4 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
l_fin_sup -= NB_POS;
l_fin_inf--;
ptr_hf += STEP;
}
/*----------------------------------------------------------------------*
* Compute elements of: rri0i4[], rri2i3[], rri1i2[], rri0i1[] *
*----------------------------------------------------------------------*/
ptr_hd = h;
ptr_hf = ptr_hd + 4;
l_fin_sup = MSIZE-1;
l_fin_inf = l_fin_sup-(int16_t)1;
for(k=0; k<NB_POS; k++) {
p3 = rri0i4 + l_fin_sup;
p2 = rri2i3 + l_fin_inf;
p1 = rri1i2 + l_fin_inf;
p0 = rri0i1 + l_fin_inf;
ptr_h1 = ptr_hd;
ptr_h2 = ptr_hf;
cor = 0;
for(i=k+(int16_t)1; i<NB_POS; i++ ) {
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p2 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p1 = extract_h(cor);
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p0 = extract_h(cor);
p3 -= ldec;
p2 -= ldec;
p1 -= ldec;
p0 -= ldec;
}
cor = L_mac(cor, *ptr_h1, *ptr_h2); ptr_h1++; ptr_h2++;
*p3 = extract_h(cor);
l_fin_sup -= NB_POS;
l_fin_inf--;
ptr_hf += STEP;
}
return;
}
/*------------------------------------------------------------------------*
* Function D4i40_17_fast() *
* ~~~~~~~~~ *
* Algebraic codebook for ITU 8kb/s. *
* -> 17 bits; 4 pulses in a frame of 40 samples *
* *
*------------------------------------------------------------------------*
* The code length is 40, containing 4 nonzero pulses i0, i1, i2, i3. *
* Each pulses can have 8 possible positions (positive or negative) *
* except i3 that have 16 possible positions. *
* *
* i0 (+-1) : 0, 5, 10, 15, 20, 25, 30, 35 *
* i1 (+-1) : 1, 6, 11, 16, 21, 26, 31, 36 *
* i2 (+-1) : 2, 7, 12, 17, 22, 27, 32, 37 *
* i3 (+-1) : 3, 8, 13, 18, 23, 28, 33, 38 *
* 4, 9, 14, 19, 24, 29, 34, 39 *
*------------------------------------------------------------------------*/
static int16_t D4i40_17_fast(/*(o) : Index of pulses positions. */
int16_t dn[], /* (i) : Correlations between h[] and Xn[]. */
int16_t rr[], /* (i) : Correlations of impulse response h[]. */
int16_t h[], /* (i) Q12: Impulse response of filters. */
int16_t cod[], /* (o) Q13: Selected algebraic codeword. */
int16_t y[], /* (o) Q12: Filtered algebraic codeword. */
int16_t *sign /* (o) : Signs of 4 pulses. */
)
{
int16_t i0, i1, i2, i3, ip0, ip1, ip2, ip3;
int16_t i, j, ix, iy, track, trk, max;
int16_t prev_i0, i1_offset;
int16_t psk, ps, ps0, ps1, ps2, sq, sq2;
int16_t alpk, alp, alp_16;
int32_t s, alp0, alp1, alp2;
int16_t *p0, *p1, *p2, *p3, *p4;
int16_t sign_dn[L_SUBFR], sign_dn_inv[L_SUBFR], *psign;
int16_t tmp_vect[NB_POS];
int16_t *rri0i0, *rri1i1, *rri2i2, *rri3i3, *rri4i4;
int16_t *rri0i1, *rri0i2, *rri0i3, *rri0i4;
int16_t *rri1i2, *rri1i3, *rri1i4;
int16_t *rri2i3, *rri2i4;
int16_t *ptr_rri0i3_i4;
int16_t *ptr_rri1i3_i4;
int16_t *ptr_rri2i3_i4;
int16_t *ptr_rri3i3_i4;
/* Init pointers */
rri0i0 = rr;
rri1i1 = rri0i0 + NB_POS;
rri2i2 = rri1i1 + NB_POS;
rri3i3 = rri2i2 + NB_POS;
rri4i4 = rri3i3 + NB_POS;
rri0i1 = rri4i4 + NB_POS;
rri0i2 = rri0i1 + MSIZE;
rri0i3 = rri0i2 + MSIZE;
rri0i4 = rri0i3 + MSIZE;
rri1i2 = rri0i4 + MSIZE;
rri1i3 = rri1i2 + MSIZE;
rri1i4 = rri1i3 + MSIZE;
rri2i3 = rri1i4 + MSIZE;
rri2i4 = rri2i3 + MSIZE;
/*-----------------------------------------------------------------------*
* Chose the sign of the impulse. *
*-----------------------------------------------------------------------*/
for (i=0; i<L_SUBFR; i++)
{
if (dn[i] >= 0)
{
sign_dn[i] = MAX_16;
sign_dn_inv[i] = MIN_16;
}
else
{
sign_dn[i] = MIN_16;
sign_dn_inv[i] = MAX_16;
dn[i] = negate(dn[i]);
}
}
/*-------------------------------------------------------------------*
* Modification of rrixiy[] to take signs into account. *
*-------------------------------------------------------------------*/
p0 = rri0i1;
p1 = rri0i2;
p2 = rri0i3;
p3 = rri0i4;
for(i0=0; i0<L_SUBFR; i0+=STEP)
{
psign = sign_dn;
if (psign[i0] < 0) psign = sign_dn_inv;
for(i1=1; i1<L_SUBFR; i1+=STEP)
{
*p0 = mult(*p0, psign[i1]);
*p0 = *p0 + 1;
*p1 = mult(*p1, psign[i1+1]);
*p1 = *p1 + 1;
*p2 = mult(*p2, psign[i1+2]);
*p2 = *p2 + 1;
*p3 = mult(*p3, psign[i1+3]);
*p3 = *p3 + 1;
}
}
p0 = rri1i2;
p1 = rri1i3;
p2 = rri1i4;
for(i1=1; i1<L_SUBFR; i1+=STEP)
{
psign = sign_dn;
if (psign[i1] < 0) psign = sign_dn_inv;
for(i2=2; i2<L_SUBFR; i2+=STEP)
{
*p0 = mult(*p0, psign[i2]);
*p0 = *p0 + 1;
*p1 = mult(*p1, psign[i2+1]);
*p1 = *p1 + 1;
*p2 = mult(*p2, psign[i2+2]);
*p2 = *p2 + 1;
}
}
p0 = rri2i3;
p1 = rri2i4;
for(i2=2; i2<L_SUBFR; i2+=STEP)
{
psign = sign_dn;
if (psign[i2] < 0) psign = sign_dn_inv;
for(i3=3; i3<L_SUBFR; i3+=STEP)
{
*p0 = mult(*p0, psign[i3]);
*p0 = *p0 + 1;
*p1 = mult(*p1, psign[i3+1]);
*p1 = *p1 + 1;
}
}
/*-------------------------------------------------------------------*
* Search the optimum positions of the four pulses which maximize *
* square(correlation) / energy *
*-------------------------------------------------------------------*/
psk = -1;
alpk = 1;
ptr_rri0i3_i4 = rri0i3;
ptr_rri1i3_i4 = rri1i3;
ptr_rri2i3_i4 = rri2i3;
ptr_rri3i3_i4 = rri3i3;
/* Initializations only to remove warning from some compilers */
ip0=0; ip1=1; ip2=2; ip3=3; ix=0; iy=0; ps=0;
/* search 2 times: track 3 and 4 */
for (track=3, trk=0; track<5; track++, trk++)
{
/*------------------------------------------------------------------*
* depth first search 3, phase A: track 2 and 3/4. *
*------------------------------------------------------------------*/
sq = -1;
alp = 1;
/* i0 loop: 2 positions in track 2 */
prev_i0 = -1;
for (i=0; i<2; i++)
{
max = -1;
/* search "dn[]" maximum position in track 2 */
for (j=2; j<L_SUBFR; j+=STEP)
{
if ((sub(dn[j], max) > 0) && (sub(prev_i0,j) != 0))
{
max = dn[j];
i0 = j;
}
}
prev_i0 = i0;
j = mult(i0, 6554); /* j = i0/5 */
p0 = rri2i2 + j;
ps1 = dn[i0];
alp1 = L_mult(*p0, _1_4);
/* i1 loop: 8 positions in track 2 */
p0 = ptr_rri2i3_i4 + shl(j, 3);
p1 = ptr_rri3i3_i4;
for (i1=track; i1<L_SUBFR; i1+=STEP)
{
ps2 = add(ps1, dn[i1]); /* index increment = STEP */
/* alp1 = alp0 + rr[i0][i1] + 1/2*rr[i1][i1]; */
alp2 = L_mac(alp1, *p0++, _1_2);
alp2 = L_mac(alp2, *p1++, _1_4);
sq2 = mult(ps2, ps2);
alp_16 = _round(alp2);
s = L_msu(L_mult(alp,sq2),sq,alp_16);
if (s > 0)
{
sq = sq2;
ps = ps2;
alp = alp_16;
ix = i0;
iy = i1;
}
}
}
i0 = ix;
i1 = iy;
i1_offset = shl(mult(i1, 6554), 3); /* j = 8*(i1/5) */
/*------------------------------------------------------------------*
* depth first search 3, phase B: track 0 and 1. *
*------------------------------------------------------------------*/
ps0 = ps;
alp0 = L_mult(alp, _1_4);
sq = -1;
alp = 1;
/* build vector for next loop to decrease complexity */
p0 = rri1i2 + mult(i0, 6554);
p1 = ptr_rri1i3_i4 + mult(i1, 6554);
p2 = rri1i1;
p3 = tmp_vect;
for (i3=1; i3<L_SUBFR; i3+=STEP)
{
/* rrv[i3] = rr[i3][i3] + rr[i0][i3] + rr[i1][i3]; */
s = L_mult(*p0, _1_4); p0 += NB_POS;
s = L_mac(s, *p1, _1_4); p1 += NB_POS;
s = L_mac(s, *p2++, _1_8);
*p3++ = _round(s);
}
/* i2 loop: 8 positions in track 0 */
p0 = rri0i2 + mult(i0, 6554);
p1 = ptr_rri0i3_i4 + mult(i1, 6554);
p2 = rri0i0;
p3 = rri0i1;
for (i2=0; i2<L_SUBFR; i2+=STEP)
{
ps1 = add(ps0, dn[i2]); /* index increment = STEP */
/* alp1 = alp0 + rr[i0][i2] + rr[i1][i2] + 1/2*rr[i2][i2]; */
alp1 = L_mac(alp0, *p0, _1_8); p0 += NB_POS;
alp1 = L_mac(alp1, *p1, _1_8); p1 += NB_POS;
alp1 = L_mac(alp1, *p2++, _1_16);
/* i3 loop: 8 positions in track 1 */
p4 = tmp_vect;
for (i3=1; i3<L_SUBFR; i3+=STEP)
{
ps2 = add(ps1, dn[i3]); /* index increment = STEP */
/* alp1 = alp0 + rr[i0][i3] + rr[i1][i3] + rr[i2][i3] + 1/2*rr[i3][i3]; */
alp2 = L_mac(alp1, *p3++, _1_8);
alp2 = L_mac(alp2, *p4++, _1_2);
sq2 = mult(ps2, ps2);
alp_16 = _round(alp2);
s = L_msu(L_mult(alp,sq2),sq,alp_16);
if (s > 0)
{
sq = sq2;
alp = alp_16;
ix = i2;
iy = i3;
}
}
}
/*----------------------------------------------------------------*
* depth first search 3: compare codevector with the best case. *
*----------------------------------------------------------------*/
s = L_msu(L_mult(alpk,sq),psk,alp);
if (s > 0)
{
psk = sq;
alpk = alp;
ip2 = i0;
ip3 = i1;
ip0 = ix;
ip1 = iy;
}
/*------------------------------------------------------------------*
* depth first search 4, phase A: track 3 and 0. *
*------------------------------------------------------------------*/
sq = -1;
alp = 1;
/* i0 loop: 2 positions in track 3/4 */
prev_i0 = -1;
for (i=0; i<2; i++)
{
max = -1;
/* search "dn[]" maximum position in track 3/4 */
for (j=track; j<L_SUBFR; j+=STEP)
{
if ((sub(dn[j], max) > 0) && (sub(prev_i0,j) != 0))
{
max = dn[j];
i0 = j;
}
}
prev_i0 = i0;
j = mult(i0, 6554); /* j = i0/5 */
p0 = ptr_rri3i3_i4 + j;
ps1 = dn[i0];
alp1 = L_mult(*p0, _1_4);
/* i1 loop: 8 positions in track 0 */
p0 = ptr_rri0i3_i4 + j;
p1 = rri0i0;
for (i1=0; i1<L_SUBFR; i1+=STEP)
{
ps2 = add(ps1, dn[i1]); /* index increment = STEP */
/* alp1 = alp0 + rr[i0][i1] + 1/2*rr[i1][i1]; */
alp2 = L_mac(alp1, *p0, _1_2); p0 += NB_POS;
alp2 = L_mac(alp2, *p1++, _1_4);
sq2 = mult(ps2, ps2);
alp_16 = _round(alp2);
s = L_msu(L_mult(alp,sq2),sq,alp_16);
if (s > 0)
{
sq = sq2;
ps = ps2;
alp = alp_16;
ix = i0;
iy = i1;
}
}
}
i0 = ix;
i1 = iy;
i1_offset = shl(mult(i1, 6554), 3); /* j = 8*(i1/5) */
/*------------------------------------------------------------------*
* depth first search 4, phase B: track 1 and 2. *
*------------------------------------------------------------------*/
ps0 = ps;
alp0 = L_mult(alp, _1_4);
sq = -1;
alp = 1;
/* build vector for next loop to decrease complexity */
p0 = ptr_rri2i3_i4 + mult(i0, 6554);
p1 = rri0i2 + i1_offset;
p2 = rri2i2;
p3 = tmp_vect;
for (i3=2; i3<L_SUBFR; i3+=STEP)
{
/* rrv[i3] = rr[i3][i3] + rr[i0][i3] + rr[i1][i3]; */
s = L_mult(*p0, _1_4); p0 += NB_POS;
s = L_mac(s, *p1++, _1_4);
s = L_mac(s, *p2++, _1_8);
*p3++ = _round(s);
}
/* i2 loop: 8 positions in track 1 */
p0 = ptr_rri1i3_i4 + mult(i0, 6554);
p1 = rri0i1 + i1_offset;
p2 = rri1i1;
p3 = rri1i2;
for (i2=1; i2<L_SUBFR; i2+=STEP)
{
ps1 = add(ps0, dn[i2]); /* index increment = STEP */
/* alp1 = alp0 + rr[i0][i2] + rr[i1][i2] + 1/2*rr[i2][i2]; */
alp1 = L_mac(alp0, *p0, _1_8); p0 += NB_POS;
alp1 = L_mac(alp1, *p1++, _1_8);
alp1 = L_mac(alp1, *p2++, _1_16);
/* i3 loop: 8 positions in track 2 */
p4 = tmp_vect;
for (i3=2; i3<L_SUBFR; i3+=STEP)
{
ps2 = add(ps1, dn[i3]); /* index increment = STEP */
/* alp1 = alp0 + rr[i0][i3] + rr[i1][i3] + rr[i2][i3] + 1/2*rr[i3][i3]; */
alp2 = L_mac(alp1, *p3++, _1_8);
alp2 = L_mac(alp2, *p4++, _1_2);
sq2 = mult(ps2, ps2);
alp_16 = _round(alp2);
s = L_msu(L_mult(alp,sq2),sq,alp_16);
if (s > 0)
{
sq = sq2;
alp = alp_16;
ix = i2;
iy = i3;
}
}
}
/*----------------------------------------------------------------*
* depth first search 1: compare codevector with the best case. *
*----------------------------------------------------------------*/
s = L_msu(L_mult(alpk,sq),psk,alp);
if (s > 0)
{
psk = sq;
alpk = alp;
ip3 = i0;
ip0 = i1;
ip1 = ix;
ip2 = iy;
}
ptr_rri0i3_i4 = rri0i4;
ptr_rri1i3_i4 = rri1i4;
ptr_rri2i3_i4 = rri2i4;
ptr_rri3i3_i4 = rri4i4;
}
/* Set the sign of impulses */
i0 = sign_dn[ip0];
i1 = sign_dn[ip1];
i2 = sign_dn[ip2];
i3 = sign_dn[ip3];
/* Find the codeword corresponding to the selected positions */
for(i=0; i<L_SUBFR; i++) {
cod[i] = 0;
}
cod[ip0] = shr(i0, 2); /* From Q15 to Q13 */
cod[ip1] = shr(i1, 2);
cod[ip2] = shr(i2, 2);
cod[ip3] = shr(i3, 2);
/* find the filtered codeword */
for (i = 0; i < ip0; i++) y[i] = 0;
if(i0 > 0)
for(i=ip0, j=0; i<L_SUBFR; i++, j++) y[i] = h[j];
else
for(i=ip0, j=0; i<L_SUBFR; i++, j++) y[i] = negate(h[j]);
if(i1 > 0)
for(i=ip1, j=0; i<L_SUBFR; i++, j++) y[i] = add(y[i], h[j]);
else
for(i=ip1, j=0; i<L_SUBFR; i++, j++) y[i] = sub(y[i], h[j]);
if(i2 > 0)
for(i=ip2, j=0; i<L_SUBFR; i++, j++) y[i] = add(y[i], h[j]);
else
for(i=ip2, j=0; i<L_SUBFR; i++, j++) y[i] = sub(y[i], h[j]);
if(i3 > 0)
for(i=ip3, j=0; i<L_SUBFR; i++, j++) y[i] = add(y[i], h[j]);
else
for(i=ip3, j=0; i<L_SUBFR; i++, j++) y[i] = sub(y[i], h[j]);
/* find codebook index; 17-bit address */
i = 0;
if(i0 > 0) i = add(i, 1);
if(i1 > 0) i = add(i, 2);
if(i2 > 0) i = add(i, 4);
if(i3 > 0) i = add(i, 8);
*sign = i;
ip0 = mult(ip0, 6554); /* ip0/5 */
ip1 = mult(ip1, 6554); /* ip1/5 */
ip2 = mult(ip2, 6554); /* ip2/5 */
i = mult(ip3, 6554); /* ip3/5 */
j = add(i, shl(i, 2)); /* j = i*5 */
j = sub(ip3, add(j, 3)); /* j= ip3%5 -3 */
ip3 = add(shl(i, 1), j);
i = add(ip0, shl(ip1, 3));
i = add(i , shl(ip2, 6));
i = add(i , shl(ip3, 9));
return i;
}