void interpolate_isp(
int16 isp_old[], /* input : isps from past frame */
int16 isp_new[], /* input : isps from present frame */
const int16 frac[], /* input : fraction for 3 first subfr (Q15) */
int16 Az[] /* output: LP coefficients in 4 subframes */
)
{
int16 i, k, fac_old, fac_new;
int16 isp[M];
int32 L_tmp;
for (k = 0; k < 3; k++)
{
fac_new = frac[k];
fac_old = add_int16(sub_int16(32767, fac_new), 1); /* 1.0 - fac_new */
for (i = 0; i < M; i++)
{
L_tmp = mul_16by16_to_int32(isp_old[i], fac_old);
L_tmp = mac_16by16_to_int32(L_tmp, isp_new[i], fac_new);
isp[i] = amr_wb_round(L_tmp);
}
Isp_Az(isp, Az, M, 0);
Az += MP1;
}
/* 4th subframe: isp_new (frac=1.0) */
Isp_Az(isp_new, Az, M, 0);
return;
}
/* 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;
}
/*
* Compute gcode0
* = Sum(i=0,1) pred[i]*past_qua_en[i] + mean_ener - ener_code
*/
L_tmp = L_deposit_h(MEAN_ENER); /* MEAN_ENER in Q16 */
L_tmp = shl_int32(L_tmp, 8); /* From Q16 to Q24 */
L_tmp = mac_16by16_to_int32(L_tmp, pred[0], past_qua_en[0]); /* Q13*Q10 -> Q24 */
L_tmp = mac_16by16_to_int32(L_tmp, pred[1], past_qua_en[1]); /* Q13*Q10 -> Q24 */
L_tmp = mac_16by16_to_int32(L_tmp, pred[2], past_qua_en[2]); /* Q13*Q10 -> Q24 */
L_tmp = mac_16by16_to_int32(L_tmp, pred[3], past_qua_en[3]); /* Q13*Q10 -> Q24 */
gcode0 = extract_h(L_tmp); /* From Q24 to Q8 */
/*
* gcode0 = pow(10.0, gcode0/20)
* = pow(2, 3.321928*gcode0/20)
* = pow(2, 0.166096*gcode0)
*/
L_tmp = ((int32)gcode0 * 5443) >> 7; /* *0.166096 in Q15 -> Q24 */
int32_to_dpf(L_tmp, &exp_gcode0, &frac); /* Extract exponant of gcode0 */
void agc2_amr_wb(
int16 * sig_in, /* (i) : postfilter input signal */
int16 * sig_out, /* (i/o) : postfilter output signal */
int16 l_trm /* (i) : subframe size */
)
{
int16 i, exp;
int16 gain_in, gain_out, g0;
int32 s;
int16 temp;
/* calculate gain_out with exponent */
temp = sig_out[0] >> 2;
s = fxp_mul_16by16(temp, temp) << 1;
for (i = 1; i < l_trm; i++)
{
temp = sig_out[i] >> 2;
s = mac_16by16_to_int32(s, temp, temp);
}
if (s == 0)
{
return;
}
exp = normalize_amr_wb(s) - 1;
gain_out = amr_wb_round(s << exp);
/* calculate gain_in with exponent */
temp = sig_in[0] >> 2;
s = mul_16by16_to_int32(temp, temp);
for (i = 1; i < l_trm; i++)
{
temp = sig_in[i] >> 2;
s = mac_16by16_to_int32(s, temp, temp);
}
if (s == 0)
{
g0 = 0;
}
else
{
i = normalize_amr_wb(s);
gain_in = amr_wb_round(s << i);
exp -= i;
/*
* g0 = sqrt(gain_in/gain_out)
*/
s = div_16by16(gain_out, gain_in);
s = shl_int32(s, 7); /* s = gain_out / gain_in */
s = shr_int32(s, exp); /* add exponent */
s = one_ov_sqrt(s);
g0 = amr_wb_round(shl_int32(s, 9));
}
/* sig_out(n) = gain(n) sig_out(n) */
for (i = 0; i < l_trm; i++)
{
sig_out[i] = extract_h(shl_int32(fxp_mul_16by16(sig_out[i], g0), 3));
}
return;
}
