?? qua_gain.c
字號:
exp_min[2] = add( exp_coeff[2], sub( shl( exp_gcode0, 1 ), 21 ) );
exp_min[3] = add( exp_coeff[3], sub( exp_gcode0, 3 ) );
exp_min[4] = add( exp_coeff[4], sub( exp_gcode0, 4 ) );
e_min = exp_min[0];
for(i=1; i<5; i++){
if( sub(exp_min[i], e_min) < 0 ){
e_min = exp_min[i];
}
}
/* align coeff[] and save in special 32 bit double precision */
for(i=0; i<5; i++){
j = sub( exp_min[i], e_min );
L_tmp = L_deposit_h( g_coeff[i] );
L_tmp = L_shr( L_tmp, j ); /* L_tmp:Q[exp_g_coeff[i]+16-j] */
L_Extract( L_tmp, &coeff[i], &coeff_lsf[i] ); /* DPF */
}
/* Codebook search */
L_dist_min = MAX_32;
/* initialization used only to suppress Microsoft Visual C++ warnings */
index1 = cand1;
index2 = cand2;
if(tameflag == 1){
for(i=0; i<NCAN1; i++){
for(j=0; j<NCAN2; j++){
g_pitch = add( gbk1[cand1+i][0], gbk2[cand2+j][0] ); /* Q14 */
if(g_pitch < GP0999) {
L_acc = L_deposit_l( gbk1[cand1+i][1] );
L_accb = L_deposit_l( gbk2[cand2+j][1] ); /* Q13 */
L_tmp = L_add( L_acc,L_accb );
tmp = extract_l( L_shr( L_tmp,1 ) ); /* Q12 */
g_code = mult( gcode0, tmp ); /* Q[exp_gcode0+12-15] */
g2_pitch = mult(g_pitch, g_pitch); /* Q13 */
g2_code = mult(g_code, g_code); /* Q[2*exp_gcode0-6-15] */
g_pit_cod= mult(g_code, g_pitch); /* Q[exp_gcode0-3+14-15] */
L_tmp = Mpy_32_16(coeff[0], coeff_lsf[0], g2_pitch);
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[1], coeff_lsf[1], g_pitch) );
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[2], coeff_lsf[2], g2_code) );
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[3], coeff_lsf[3], g_code) );
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[4], coeff_lsf[4], g_pit_cod) );
L_temp = L_sub(L_tmp, L_dist_min);
if( L_temp < 0L ){
L_dist_min = L_tmp;
index1 = add(cand1,i);
index2 = add(cand2,j);
}
}
}
}
}
else{
for(i=0; i<NCAN1; i++){
for(j=0; j<NCAN2; j++){
g_pitch = add( gbk1[cand1+i][0], gbk2[cand2+j][0] ); /* Q14 */
L_acc = L_deposit_l( gbk1[cand1+i][1] );
L_accb = L_deposit_l( gbk2[cand2+j][1] ); /* Q13 */
L_tmp = L_add( L_acc,L_accb );
tmp = extract_l( L_shr( L_tmp,1 ) ); /* Q12 */
g_code = mult( gcode0, tmp ); /* Q[exp_gcode0+12-15] */
g2_pitch = mult(g_pitch, g_pitch); /* Q13 */
g2_code = mult(g_code, g_code); /* Q[2*exp_gcode0-6-15] */
g_pit_cod= mult(g_code, g_pitch); /* Q[exp_gcode0-3+14-15] */
L_tmp = Mpy_32_16(coeff[0], coeff_lsf[0], g2_pitch);
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[1], coeff_lsf[1], g_pitch) );
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[2], coeff_lsf[2], g2_code) );
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[3], coeff_lsf[3], g_code) );
L_tmp = L_add(L_tmp, Mpy_32_16(coeff[4], coeff_lsf[4], g_pit_cod) );
L_temp = L_sub(L_tmp, L_dist_min);
if( L_temp < 0L ){
L_dist_min = L_tmp;
index1 = add(cand1,i);
index2 = add(cand2,j);
}
}
}
}
/* Read the quantized gain */
/*-----------------------------------------------------------------*
* *gain_pit = gbk1[indice1][0] + gbk2[indice2][0]; *
*-----------------------------------------------------------------*/
*gain_pit = add( gbk1[index1][0], gbk2[index2][0] ); /* Q14 */
/*-----------------------------------------------------------------*
* *gain_code = (gbk1[indice1][1]+gbk2[indice2][1]) * gcode0; *
*-----------------------------------------------------------------*/
L_acc = L_deposit_l( gbk1[index1][1] );
L_accb = L_deposit_l( gbk2[index2][1] );
L_gbk12 = L_add( L_acc, L_accb ); /* Q13 */
tmp = extract_l( L_shr( L_gbk12,1 ) ); /* Q12 */
L_acc = L_mult(tmp, gcode0); /* Q[exp_gcode0+12+1] */
L_acc = L_shl(L_acc, add( negate(exp_gcode0),(-12-1+1+16) ));
*gain_cod = extract_h( L_acc ); /* Q1 */
/*----------------------------------------------*
* update table of past quantized energies *
*----------------------------------------------*/
Gain_update( past_qua_en, L_gbk12 );
return( add( map1[index1]*(Word16)NCODE2, map2[index2] ) );
}
/*---------------------------------------------------------------------------*
* Function Gbk_presel *
* ~~~~~~~~~~~~~~~~~~~ *
* - presearch for gain codebook - *
*---------------------------------------------------------------------------*/
static void Gbk_presel(
Word16 best_gain[], /* (i) [0] Q9 : unquantized pitch gain */
/* (i) [1] Q2 : unquantized code gain */
Word16 *cand1, /* (o) : index of best 1st stage vector */
Word16 *cand2, /* (o) : index of best 2nd stage vector */
Word16 gcode0 /* (i) Q4 : presearch for gain codebook */
)
{
Word16 acc_h;
Word16 sft_x,sft_y;
Word32 L_acc,L_preg,L_cfbg,L_tmp,L_tmp_x,L_tmp_y;
Word32 L_temp;
/*--------------------------------------------------------------------------*
x = (best_gain[1]-(coef[0][0]*best_gain[0]+coef[1][1])*gcode0) * inv_coef;
*--------------------------------------------------------------------------*/
L_cfbg = L_mult( coef[0][0], best_gain[0] ); /* L_cfbg:Q20 -> !!y */
L_acc = L_shr( L_coef[1][1], 15 ); /* L_acc:Q20 */
L_acc = L_add( L_cfbg , L_acc );
acc_h = extract_h( L_acc ); /* acc_h:Q4 */
L_preg = L_mult( acc_h, gcode0 ); /* L_preg:Q9 */
L_acc = L_shl( L_deposit_l( best_gain[1] ), 7 ); /* L_acc:Q9 */
L_acc = L_sub( L_acc, L_preg );
acc_h = extract_h( L_shl( L_acc,2 ) ); /* L_acc_h:Q[-5] */
L_tmp_x = L_mult( acc_h, INV_COEF ); /* L_tmp_x:Q15 */
/*--------------------------------------------------------------------------*
y = (coef[1][0]*(-coef[0][1]+best_gain[0]*coef[0][0])*gcode0
-coef[0][0]*best_gain[1]) * inv_coef;
*--------------------------------------------------------------------------*/
L_acc = L_shr( L_coef[0][1], 10 ); /* L_acc:Q20 */
L_acc = L_sub( L_cfbg, L_acc ); /* !!x -> L_cfbg:Q20 */
acc_h = extract_h( L_acc ); /* acc_h:Q4 */
acc_h = mult( acc_h, gcode0 ); /* acc_h:Q[-7] */
L_tmp = L_mult( acc_h, coef[1][0] ); /* L_tmp:Q10 */
L_preg = L_mult( coef[0][0], best_gain[1] ); /* L_preg:Q13 */
L_acc = L_sub( L_tmp, L_shr(L_preg,3) ); /* L_acc:Q10 */
acc_h = extract_h( L_shl( L_acc,2 ) ); /* acc_h:Q[-4] */
L_tmp_y = L_mult( acc_h, INV_COEF ); /* L_tmp_y:Q16 */
sft_y = (14+4+1)-16; /* (Q[thr1]+Q[gcode0]+1)-Q[L_tmp_y] */
sft_x = (15+4+1)-15; /* (Q[thr2]+Q[gcode0]+1)-Q[L_tmp_x] */
if(gcode0>0){
/*-- pre select codebook #1 --*/
*cand1 = 0 ;
do{
L_temp = L_sub( L_tmp_y, L_shr(L_mult(thr1[*cand1],gcode0),sft_y));
if(L_temp >0L ){
(*cand1) =add(*cand1,1);
}
else break ;
} while(sub((*cand1),(NCODE1-NCAN1))<0) ;
/*-- pre select codebook #2 --*/
*cand2 = 0 ;
do{
L_temp = L_sub( L_tmp_x , L_shr(L_mult(thr2[*cand2],gcode0),sft_x));
if( L_temp >0L) {
(*cand2) =add(*cand2,1);
}
else break ;
} while(sub((*cand2),(NCODE2-NCAN2))<0) ;
}
else{
/*-- pre select codebook #1 --*/
*cand1 = 0 ;
do{
L_temp = L_sub(L_tmp_y ,L_shr(L_mult(thr1[*cand1],gcode0),sft_y));
if( L_temp <0L){
(*cand1) =add(*cand1,1);
}
else break ;
} while(sub((*cand1),(NCODE1-NCAN1))) ;
/*-- pre select codebook #2 --*/
*cand2 = 0 ;
do{
L_temp =L_sub(L_tmp_x ,L_shr(L_mult(thr2[*cand2],gcode0),sft_x));
if( L_temp <0L){
(*cand2) =add(*cand2,1);
}
else break ;
} while(sub( (*cand2),(NCODE2-NCAN2))) ;
}
return ;
}
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