Word16 G_pitch( /* (o) Q14 : Gain of pitch lag saturated to 1.2 */
Word16 xn[], /* (i) : Pitch target. */
Word16 y1[], /* (i) : filtered adaptive codebook. */
Word16 g_coeff[], /* : Correlations need for gain quantization. */
Word16 L_subfr /* : Length of subframe. */
)
{
Word16 i;
Word16 xy, yy, exp_xy, exp_yy, gain;
Word32 L_tmp;
/* Compute scalar product <y1[],y1[]> */
L_tmp = Dot_product12(y1, y1, L_subfr, &exp_yy);
yy = (Word16)(L_tmp >> 16);
/* Compute scalar product <xn[],y1[]> */
L_tmp = Dot_product12(xn, y1, L_subfr, &exp_xy);
xy = (Word16)(L_tmp >> 16);
g_coeff[0] = yy;
g_coeff[1] = exp_yy;
g_coeff[2] = xy;
g_coeff[3] = exp_xy;
xy = xy >> 1; /* Be sure xy < yy */
/* If (xy < 0) gain = 0 */
if (xy <= 0)
return ((Word16) 0);
/* compute gain = xy/yy */
gain = div_s(xy, yy);
i = add(exp_xy, 1 - 1); /* -1 -> gain in Q14 */
i = sub(i, exp_yy);
gain = shl(gain, i); /* saturation can occur here */
/* if (gain > 1.2) gain = 1.2 in Q14 */
if (gain > 19661)
{
gain = 19661;
}
return (gain);
}
Word16 voice_factor( /* (o) Q15 : factor (-1=unvoiced to 1=voiced) */
Word16 exc[], /* (i) Q_exc : pitch excitation */
Word16 Q_exc, /* (i) : exc format */
Word16 gain_pit, /* (i) Q14 : gain of pitch */
Word16 code[], /* (i) Q9 : Fixed codebook excitation */
Word16 gain_code, /* (i) Q0 : gain of code */
Word16 L_subfr /* (i) : subframe length */
)
{
Word16 tmp, exp, ener1, exp1, ener2, exp2;
Word32 i, L_tmp;
#ifdef ASM_OPT /* asm optimization branch */
ener1 = extract_h(Dot_product12_asm(exc, exc, L_subfr, &exp1));
#else
ener1 = extract_h(Dot_product12(exc, exc, L_subfr, &exp1));
#endif
exp1 = exp1 - (Q_exc + Q_exc);
L_tmp = vo_L_mult(gain_pit, gain_pit);
exp = norm_l(L_tmp);
tmp = extract_h(L_tmp << exp);
ener1 = vo_mult(ener1, tmp);
exp1 = exp1 - exp - 10; /* 10 -> gain_pit Q14 to Q9 */
#ifdef ASM_OPT /* asm optimization branch */
ener2 = extract_h(Dot_product12_asm(code, code, L_subfr, &exp2));
#else
ener2 = extract_h(Dot_product12(code, code, L_subfr, &exp2));
#endif
exp = norm_s(gain_code);
tmp = gain_code << exp;
tmp = vo_mult(tmp, tmp);
ener2 = vo_mult(ener2, tmp);
exp2 = exp2 - (exp + exp);
i = exp1 - exp2;
if (i >= 0)
{
ener1 = ener1 >> 1;
ener2 = ener2 >> (i + 1);
} else
//============================================================================
//函数功能:找到语音因子
//函数参数:"exc[]"表示因子，作为输入参数；"Q_exc"表示激励，表示输入参数；"gain_pit"
// 表示增益音高，作为输入参数；"code[]"表示固定码本激励，作为输入参数；
// "gain_code"表示编码增益，作为输入参数；"L_subfr"表示子帧长度
//============================================================================
int16 voice_factor( /* (o) Q15 : factor (-1=unvoiced to 1=voiced) */
int16 exc[], /* (i) Q_exc : pitch excitation */
int16 Q_exc, /* (i) : exc format */
int16 gain_pit, /* (i) Q14 : gain of pitch */
int16 code[], /* (i) Q9 : Fixed codebook excitation */
int16 gain_code, /* (i) Q0 : gain of code */
int16 L_subfr /* (i) : subframe length */
)
{
int16 i, tmp, exp, ener1, exp1, ener2, exp2;
int32 L_tmp;
ener1 = extract_h(Dot_product12(exc, exc, L_subfr, &exp1));
exp1 = sub_int16(exp1, Q_exc << 1);
L_tmp = mul_16by16_to_int32(gain_pit, gain_pit);
exp = normalize_amr_wb(L_tmp);
tmp = (int16)((L_tmp << exp) >> 16);
ener1 = mult_int16(ener1, tmp);
exp1 -= (exp + 10); /* 10 -> gain_pit Q14 to Q9 */
ener2 = extract_h(Dot_product12(code, code, L_subfr, &exp2));
exp = norm_s(gain_code);
tmp = shl_int16(gain_code, exp);
tmp = mult_int16(tmp, tmp);
ener2 = mult_int16(ener2, tmp);
exp2 -= (exp << 1);
i = exp1 - exp2;
if (i >= 0)
{
ener1 >>= 1;
ener2 >>= (i + 1);
}
//============================================================================
//函数功能:设置存储器
//函数参数:"index"表示指标量化，作为输入参数；"nbits"表示位数，作为输入参数；"
// code[]"表示创新载体，作为输入参数；"L_subfr"表示子帧长度，作为输入参
// 数；"gain_pit"表示基音增益，作为输出参数；"gain_cod"表示编码增益，作
// 为输出参数；"bfi"表示坏帧指示，作为输入参数；"prev_bfi"表示先前BF指
// 示器，作为输入参数；"state"表示BFH的状态，作为输入参数；"unusable_frame"
// 表示UF指示器，作为输入参数；"vad_hist"表示非语音帧的数目，作为输入参
// 数；"mem"表示静态存储器，既作为输入参数又作为输出参数
//============================================================================
void dec_gain2_amr_wb(
int16 index, /* (i) : index of quantization. */
int16 nbits, /* (i) : number of bits (6 or 7) */
int16 code[], /* (i) Q9 : Innovative vector. */
int16 L_subfr, /* (i) : Subframe lenght. */
int16 * gain_pit, /* (o) Q14 : Pitch gain. */
int32 * gain_cod, /* (o) Q16 : Code gain. */
int16 bfi, /* (i) : bad frame indicator */
int16 prev_bfi, /* (i) : Previous BF indicator */
int16 state, /* (i) : State of BFH */
int16 unusable_frame, /* (i) : UF indicator */
int16 vad_hist, /* (i) : number of non-speech frames */
int16 * mem /* (i/o) : static memory (4 words) */
)
{
const int16 *p;
int16 *past_gain_pit, *past_gain_code, *past_qua_en, *gbuf, *pbuf, *prev_gc;
int16 *pbuf2;
int16 i, tmp, exp, frac, gcode0, exp_gcode0, qua_ener, gcode_inov;
int16 tmp1, g_code;
int16 tmp2;
int32 L_tmp;
past_qua_en = mem;
past_gain_pit = mem + 4;
past_gain_code = mem + 5;
prev_gc = mem + 6;
pbuf = mem + 7;
gbuf = mem + 12;
pbuf2 = mem + 17;
/*
* Find energy of code and compute:
*
* L_tmp = 1.0 / sqrt(energy of code/ L_subfr)
*/
L_tmp = Dot_product12(code, code, L_subfr, &exp);
exp -= 24; /* exp: -18 (code in Q9), -6 (/L_subfr) */
one_ov_sqrt_norm(&L_tmp, &exp);
gcode_inov = extract_h(shl_int32(L_tmp, exp - 3)); /* g_code_inov in Q12 */
/*
* Case of erasure.
*/
if (bfi != 0)
{
tmp = median5(&pbuf[2]);
*past_gain_pit = tmp;
if (*past_gain_pit > 15565)
{
*past_gain_pit = 15565; /* 0.95 in Q14 */
}
if (unusable_frame != 0)
{
*gain_pit = mult_int16(pdown_unusable[state], *past_gain_pit);
}
else
{
*gain_pit = mult_int16(pdown_usable[state], *past_gain_pit);
}
tmp = median5(&gbuf[2]);
if (vad_hist > 2)
{
*past_gain_code = tmp;
}
else
{
if (unusable_frame != 0)
{
*past_gain_code = mult_int16(cdown_unusable[state], tmp);
}
else
{
*past_gain_code = mult_int16(cdown_usable[state], tmp);
}
}
/* update table of past quantized energies */
//更新过去的量子化的能量表
tmp = past_qua_en[3];
tmp1 = past_qua_en[2];
L_tmp = tmp;
L_tmp += tmp1;
past_qua_en[3] = tmp;
tmp = past_qua_en[1];
tmp1 = past_qua_en[0];
L_tmp += tmp;
L_tmp += tmp1;
past_qua_en[2] = tmp;
qua_ener = (int16)(L_tmp >> 3);
past_qua_en[1] = tmp1;
qua_ener -= 3072; /* -3 in Q10 */
if (qua_ener < -14336)
{
qua_ener = -14336; /* -14 in Q10 */
}
past_qua_en[0] = qua_ener;
for (i = 1; i < 5; i++)
{
gbuf[i - 1] = gbuf[i];
pbuf[i - 1] = pbuf[i];
}
gbuf[4] = *past_gain_code;
pbuf[4] = *past_gain_pit;
/* adjust gain according to energy of code */
/* past_gain_code(Q3) * gcode_inov(Q12) => Q16 */
//调整增益根据能量代码
*gain_cod = mul_16by16_to_int32(*past_gain_code, gcode_inov);
return;
}
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. */
)
{
Word32 i, j, k;
Word16 st, ix, iy, pos, index, track, nb_pulse, nbiter, j_temp;
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; /* 4x16x16=1024 loop */
alp = 8192; /* alp = 2.0 (Q12) */
nb_pulse = 4;
nbpos[0] = 4;
nbpos[1] = 8;
break;
case 36: /* 36 bits, 8 pulses, 4 tracks */
nbiter = 4; /* 4x20x16=1280 loop */
alp = 4096; /* alp = 1.0 (Q12) */
nb_pulse = 8;
nbpos[0] = 4;
nbpos[1] = 8;
nbpos[2] = 8;
break;
case 44: /* 44 bits, 10 pulses, 4 tracks */
nbiter = 4; /* 4x26x16=1664 loop */
alp = 4096; /* alp = 1.0 (Q12) */
nb_pulse = 10;
nbpos[0] = 4;
nbpos[1] = 6;
nbpos[2] = 8;
nbpos[3] = 8;
break;
case 52: /* 52 bits, 12 pulses, 4 tracks */
nbiter = 4; /* 4x26x16=1664 loop */
alp = 4096; /* alp = 1.0 (Q12) */
nb_pulse = 12;
nbpos[0] = 4;
nbpos[1] = 6;
nbpos[2] = 8;
nbpos[3] = 8;
break;
case 64: /* 64 bits, 16 pulses, 4 tracks */
nbiter = 3; /* 3x36x16=1728 loop */
alp = 3277; /* alp = 0.8 (Q12) */
nb_pulse = 16;
nbpos[0] = 4;
nbpos[1] = 4;
nbpos[2] = 6;
nbpos[3] = 6;
nbpos[4] = 8;
nbpos[5] = 8;
break;
case 72: /* 72 bits, 18 pulses, 4 tracks */
nbiter = 3; /* 3x35x16=1680 loop */
alp = 3072; /* alp = 0.75 (Q12) */
nb_pulse = 18;
nbpos[0] = 2;
nbpos[1] = 3;
nbpos[2] = 4;
nbpos[3] = 5;
nbpos[4] = 6;
nbpos[5] = 7;
nbpos[6] = 8;
break;
case 88: /* 88 bits, 24 pulses, 4 tracks */
if(ser_size > 462)
nbiter = 1;
else
nbiter = 2; /* 2x53x16=1696 loop */
alp = 2048; /* alp = 0.5 (Q12) */
nb_pulse = 24;
nbpos[0] = 2;
nbpos[1] = 2;
nbpos[2] = 3;
nbpos[3] = 4;
nbpos[4] = 5;
nbpos[5] = 6;
nbpos[6] = 7;
nbpos[7] = 8;
nbpos[8] = 8;
nbpos[9] = 8;
break;
default:
nbiter = 0;
alp = 0;
nb_pulse = 0;
}
for (i = 0; i < nb_pulse; i++)
{
codvec[i] = i;
}
/*----------------------------------------------------------------*
* 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) */
#ifdef ASM_OPT /* asm optimization branch */
s = Dot_product12_asm(cn, cn, L_SUBFR, &exp);
#else
s = Dot_product12(cn, cn, L_SUBFR, &exp);
#endif
Isqrt_n(&s, &exp);
s = L_shl(s, (exp + 5));
k_cn = extract_h(L_add(s, 0x8000));
/* set k_dn = 32..512 (ener_dn = 2^30..2^22) */
#ifdef ASM_OPT /* asm optimization branch */
s = Dot_product12_asm(dn, dn, L_SUBFR, &exp);
#else
s = Dot_product12(dn, dn, L_SUBFR, &exp);
#endif
Isqrt_n(&s, &exp);
k_dn = (L_shl(s, (exp + 5 + 3)) + 0x8000) >> 16; /* k_dn = 256..4096 */
k_dn = vo_mult_r(alp, k_dn); /* alp in Q12 */
/* mix normalized cn[] and dn[] */
p0 = cn;
p1 = dn;
p2 = dn2;
for (i = 0; i < L_SUBFR/4; i++)
{
s = (k_cn* (*p0++))+(k_dn * (*p1++));
*p2++ = s >> 7;
s = (k_cn* (*p0++))+(k_dn * (*p1++));
*p2++ = s >> 7;
s = (k_cn* (*p0++))+(k_dn * (*p1++));
*p2++ = s >> 7;
s = (k_cn* (*p0++))+(k_dn * (*p1++));
*p2++ = s >> 7;
}
/* set sign according to dn2[] = k_cn*cn[] + k_dn*dn[] */
for(i = 0; i < L_SUBFR; i++)
{
val = dn[i];
ps = dn2[i];
if (ps >= 0)
{
sign[i] = 32767; /* sign = +1 (Q12) */
vec[i] = -32768;
} else
{
sign[i] = -32768; /* sign = -1 (Q12) */
vec[i] = 32767;
dn[i] = -val;
dn2[i] = -ps;
}
}
/*----------------------------------------------------------------*
* 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;
for (j = i; j < L_SUBFR; j += STEP)
{
if(dn2[j] > ps)
{
ps = dn2[j];
pos = j;
}
}
dn2[pos] = (k - NB_MAX); /* dn2 < 0 when position is selected */
if (k == 0)
{
pos_max[i] = pos;
}
}
}
/*--------------------------------------------------------------*
* 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;
h_inv = h_buf + (2 * L_SUBFR);
L_tmp = 0;
for (i = 0; i < L_SUBFR; i++)
{
*h++ = 0;
*h_inv++ = 0;
L_tmp += (H[i] * H[i]) << 1;
}
/* scale h[] down (/2) when energy of h[] is high with many pulses used */
val = extract_h(L_tmp);
h_shift = 0;
if ((nb_pulse >= 12) && (val > 1024))
{
h_shift = 1;
}
p0 = H;
p1 = h;
p2 = h_inv;
for (i = 0; i < L_SUBFR/4; i++)
{
*p1 = *p0++ >> h_shift;
*p2++ = -(*p1++);
*p1 = *p0++ >> h_shift;
*p2++ = -(*p1++);
*p1 = *p0++ >> h_shift;
*p2++ = -(*p1++);
*p1 = *p0++ >> h_shift;
*p2++ = -(*p1++);
}
/*------------------------------------------------------------*
* 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];
p1 = &rrixix[1][NB_POS - 1];
p2 = &rrixix[2][NB_POS - 1];
p3 = &rrixix[3][NB_POS - 1];
ptr_h1 = h;
cor = 0x00008000L; /* for rounding */
for (i = 0; i < NB_POS; i++)
{
cor += vo_L_mult((*ptr_h1), (*ptr_h1));
ptr_h1++;
*p3-- = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h1));
ptr_h1++;
*p2-- = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h1));
ptr_h1++;
*p1-- = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h1));
ptr_h1++;
*p0-- = extract_h(cor);
}
/*------------------------------------------------------------*
* 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;
ptr_hf = h + 1;
for (k = 0; k < NB_POS; k++)
{
p3 = &rrixiy[2][pos];
p2 = &rrixiy[1][pos];
p1 = &rrixiy[0][pos];
p0 = &rrixiy[3][pos - NB_POS];
cor = 0x00008000L; /* for rounding */
ptr_h1 = h;
ptr_h2 = ptr_hf;
for (i = k + 1; i < NB_POS; i++)
{
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p2 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p1 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p0 = extract_h(cor);
p3 -= (NB_POS + 1);
p2 -= (NB_POS + 1);
p1 -= (NB_POS + 1);
p0 -= (NB_POS + 1);
}
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p2 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p1 = extract_h(cor);
pos -= NB_POS;
ptr_hf += STEP;
}
/* storage order --> i3i0, i2i3, i1i2, i0i1 */
pos = MSIZE - 1;
ptr_hf = h + 3;
for (k = 0; k < NB_POS; k++)
{
p3 = &rrixiy[3][pos];
p2 = &rrixiy[2][pos - 1];
p1 = &rrixiy[1][pos - 1];
p0 = &rrixiy[0][pos - 1];
cor = 0x00008000L; /* for rounding */
ptr_h1 = h;
ptr_h2 = ptr_hf;
for (i = k + 1; i < NB_POS; i++)
{
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p2 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p1 = extract_h(cor);
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p0 = extract_h(cor);
p3 -= (NB_POS + 1);
p2 -= (NB_POS + 1);
p1 -= (NB_POS + 1);
p0 -= (NB_POS + 1);
}
cor += vo_L_mult((*ptr_h1), (*ptr_h2));
ptr_h1++;
ptr_h2++;
*p3 = extract_h(cor);
pos--;
ptr_hf += STEP;
}
/*------------------------------------------------------------*
* Modification of rrixiy[][] to take signs into account. *
*------------------------------------------------------------*/
p0 = &rrixiy[0][0];
for (k = 0; k < NB_TRACK; k++)
{
j_temp = (k + 1)&0x03;
for (i = k; i < L_SUBFR; i += STEP)
{
psign = sign;
if (psign[i] < 0)
{
psign = vec;
}
j = j_temp;
for (; j < L_SUBFR; j += STEP)
{
*p0 = vo_mult(*p0, psign[j]);
p0++;
}
}
}
/*-------------------------------------------------------------------*
* Deep first search *
*-------------------------------------------------------------------*/
psk = -1;
alpk = 1;
for (k = 0; k < nbiter; k++)
{
j_temp = k<<2;
for (i = 0; i < nb_pulse; i++)
ipos[i] = tipos[j_temp + i];
if(nbbits == 20)
{
pos = 0;
ps = 0;
alp = 0;
for (i = 0; i < L_SUBFR; i++)
{
vec[i] = 0;
}
} else if ((nbbits == 36) || (nbbits == 44))
{
/* first stage: fix 2 pulses */
pos = 2;
ix = ind[0] = pos_max[ipos[0]];
iy = ind[1] = pos_max[ipos[1]];
ps = dn[ix] + dn[iy];
i = ix >> 2; /* ix / STEP */
j = iy >> 2; /* iy / STEP */
s = rrixix[ipos[0]][i] << 13;
s += rrixix[ipos[1]][j] << 13;
i = (i << 4) + j; /* (ix/STEP)*NB_POS + (iy/STEP) */
s += rrixiy[ipos[0]][i] << 14;
alp = (s + 0x8000) >> 16;
if (sign[ix] < 0)
p0 = h_inv - ix;
else
p0 = h - ix;
if (sign[iy] < 0)
p1 = h_inv - iy;
else
p1 = h - iy;
for (i = 0; i < L_SUBFR; i++)
{
vec[i] = (*p0++) + (*p1++);
}
if(nbbits == 44)
{
ipos[8] = 0;
ipos[9] = 1;
}
} else
{