本文整理汇总了C++中L_sub函数的典型用法代码示例。如果您正苦于以下问题：C++ L_sub函数的具体用法？C++ L_sub怎么用？C++ L_sub使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了L_sub函数的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Lsp_Az
void Lsp_Az(
Word16 lsp[], /* (i) Q15 : line spectral frequencies */
Word16 a[] /* (o) Q12 : predictor coefficients (order = 10) */
)
{
Word16 i, j;
Word32 f1[6], f2[6];
Word32 t0;
Get_lsp_pol(&lsp[0],f1);
Get_lsp_pol(&lsp[1],f2);
for (i = 5; i > 0; i--)
{
f1[i] = L_add(f1[i], f1[i-1]); /* f1[i] += f1[i-1]; */
f2[i] = L_sub(f2[i], f2[i-1]); /* f2[i] -= f2[i-1]; */
}
a[0] = 4096;
for (i = 1, j = 10; i <= 5; i++, j--)
{
t0 = L_add(f1[i], f2[i]); /* f1[i] + f2[i] */
a[i] = extract_l( L_shr_r(t0, 13) ); /* from Q24 to Q12 and * 0.5 */
t0 = L_sub(f1[i], f2[i]); /* f1[i] - f2[i] */
a[j] = extract_l( L_shr_r(t0, 13) ); /* from Q24 to Q12 and * 0.5 */
}
return;
}示例2: Test_Err
Word16 Test_Err(Word16 Lag1, Word16 Lag2,ENC_HANDLE *handle)
{
int i, i1, i2;
Word16 zone1, zone2;
Word32 Acc, Err_max;
Word16 iTest;
i2 = Lag2 + ClPitchOrd/2;
zone2 = mult( (Word16) i2, (Word16) 1092);
i1 = - SubFrLen + 1 + Lag1 - ClPitchOrd/2;
if(i1 <= 0) i1 = 1;
zone1 = mult( (Word16) i1, (Word16) 1092);
Err_max = -1L;
for(i=zone2; i>=zone1; i--) {
Acc = L_sub(handle->CodStat.Err[i], Err_max);
if(Acc > 0L) {
Err_max = handle->CodStat.Err[i];
}
}
Acc = L_sub(Err_max, ThreshErr);
if((Acc > 0L) || (handle->CodStat.SinDet < 0 ) ) {
iTest = 0;
}
else {
Acc = L_negate(Acc);
Acc = L_shr(Acc, DEC);
iTest = extract_l(Acc);
}
return(iTest);
}示例3: update_exc_err
void update_exc_err(
Word32 *L_exc_err,
Word16 gain_pit, /* (i) pitch gain */
Word16 T0 /* (i) integer part of pitch delay */
)
{
Word16 i, zone1, zone2, n;
Word32 L_worst, L_temp, L_acc;
Word16 hi, lo;
L_worst = -1L;
n = sub(T0, L_SUBFR);
if(n < 0) {
L_Extract(L_exc_err[0], &hi, &lo);
L_temp = Mpy_32_16(hi, lo, gain_pit);
L_temp = L_shl(L_temp, 1);
L_temp = L_add(0x00004000L, L_temp);
L_acc = L_sub(L_temp, L_worst);
if(L_acc > 0L) {
L_worst = L_temp;
}
L_Extract(L_temp, &hi, &lo);
L_temp = Mpy_32_16(hi, lo, gain_pit);
L_temp = L_shl(L_temp, 1);
L_temp = L_add(0x00004000L, L_temp);
L_acc = L_sub(L_temp, L_worst);
if(L_acc > 0L) {
L_worst = L_temp;
}
}
else {
zone1 = tab_zone[n];
i = sub(T0, 1);
zone2 = tab_zone[i];
for(i = zone1; i <= zone2; i++) {
L_Extract(L_exc_err[i], &hi, &lo);
L_temp = Mpy_32_16(hi, lo, gain_pit);
L_temp = L_shl(L_temp, 1);
L_temp = L_add(0x00004000L, L_temp);
L_acc = L_sub(L_temp, L_worst);
if(L_acc > 0L) L_worst = L_temp;
}
}
for(i=3; i>=1; i--) {
L_exc_err[i] = L_exc_err[i-1];
}
L_exc_err[0] = L_worst;
return;
}示例4: Div_32
Word32 Div_32(Word32 L_num, Word16 denom_hi, Word16 denom_lo)
{
Word16 approx, hi, lo, n_hi, n_lo;
Word32 L_32;
/* First approximation: 1 / L_denom = 1/denom_hi */
approx = div_s( (Word16)0x3fff, denom_hi); /* result in Q14 */
/* Note: 3fff = 0.5 in Q15 */
/* 1/L_denom = approx * (2.0 - L_denom * approx) */
L_32 = Mpy_32_16(denom_hi, denom_lo, approx); /* result in Q30 */
L_32 = L_sub( (Word32)0x7fffffffL, L_32); /* result in Q30 */
L_Extract(L_32, &hi, &lo);
L_32 = Mpy_32_16(hi, lo, approx); /* = 1/L_denom in Q29 */
/* L_num * (1/L_denom) */
L_Extract(L_32, &hi, &lo);
L_Extract(L_num, &n_hi, &n_lo);
L_32 = Mpy_32(n_hi, n_lo, hi, lo); /* result in Q29 */
L_32 = L_shl(L_32, 2); /* From Q29 to Q31 */
return( L_32 );
}示例5: Log2
void Log2(
Word32 x, /* (i) input */
Word16 *int_comp, /* Q0 integer part */
Word16 *frac_comp /* Q15 fractional part */
)
{
Word16 exp, idx_man, sub_man, sub_tab;
Word32 a0;
if(x <= 0){
*int_comp = 0;
*frac_comp = 0;
}
else{
exp = norm_l(x); // normalization
a0 = L_shl(x, exp); // Q30 mantissa, i.e. 1.xxx Q30
/* use table look-up of man in [1.0, 2.0[ Q30 */
a0 = L_shr(L_sub(a0, (Word32)0x40000000), 8); // Q16 index into table - note zero'ing of leading 1
idx_man = extract_h(a0); // Q0 index into table
sub_man = extract_l(L_shr((a0 & 0xFFFF), 1)); // Q15 fractional sub_man
a0 = L_deposit_h(tablog[idx_man]); // Q31
sub_tab = sub(tablog[idx_man+1], tablog[idx_man]); // Q15
a0 = L_mac(a0, sub_man, sub_tab); // Q31
*frac_comp = intround(a0); // Q15
*int_comp = sub(30, exp); // Q0
}
return;
}示例6: Lsp_pre_select
void Lsp_pre_select(
Word16 rbuf[], /* (i) Q13 : target vetor */
Word16 lspcb1[][M], /* (i) Q13 : first stage LSP codebook */
Word16 *cand /* (o) : selected code */
)
{
Word16 i, j;
Word16 tmp; /* Q13 */
Word32 L_dmin; /* Q26 */
Word32 L_tmp; /* Q26 */
Word32 L_temp;
/* avoid the worst case. (all over flow) */
*cand = 0;
L_dmin = MAX_32;
for ( i = 0 ; i < NC0 ; i++ ) {
L_tmp = 0;
for ( j = 0 ; j < M ; j++ ) {
tmp = sub(rbuf[j], lspcb1[i][j]);
L_tmp = L_mac( L_tmp, tmp, tmp );
}
L_temp = L_sub(L_tmp,L_dmin);
if ( L_temp< 0L) {
L_dmin = L_tmp;
*cand = i;
}
}
return;
}示例7: interpolation_cos129
long interpolation_cos129( short freq )
{
short sin_data,cos_data,count,temp ;
long Ltemp,Lresult;
/* cos(x)=cos(a)+(x-a)sin(a)-pow((a-x),2)*cos(a) */
count=shr(abs_s(freq ),7 );
temp=sub( extract_l(L_mult( count,64)) , freq );
/* (a-x)sin a */
/* Scale factor for (a-x): 3217=pi2/64 */
sin_data=sin129_table [ count];
cos_data=cos129_table [count];
Ltemp=L_mpy_ls(L_mult(3217,temp),sin_data);
/* (a-x) sin(a) - [(a-x)*(a-x)*cos(a)] /2 */
/* Scale factor for (a-x)*(a-x): 20213=pi2*pi2/64 */
Ltemp=L_sub(Ltemp,
L_mpy_ls(L_mult(mult_r(10106,temp),temp),cos_data));
/* Scaled up by 64/2 times */
Ltemp=L_shl( Ltemp ,6 );
Lresult= L_add(L_deposit_h(cos_data), (Ltemp)) ;
return(Lresult);
}示例8: L_divide
Word32 L_divide(Word32 L_num, Word32 L_denom)
{
Word16 approx;
Word32 L_div;
if (L_num < 0 || L_denom < 0 || L_num > L_denom)
{
printf("ERROR: Invalid input into L_divide!\n");
return (0);
}
/* First approximation: 1 / L_denom = 1/extract_h(L_denom) */
approx = divide_s((Word16) 0x3fff, extract_h(L_denom));
/* 1/L_denom = approx * (2.0 - L_denom * approx) */
L_div = L_mpy_ls(L_denom, approx);
L_div = L_sub((Word32) 0x7fffffffL, L_div);
L_div = L_mpy_ls(L_div, approx);
/* L_num * (1/L_denom) */
L_div = L_mpy_ll(L_num, L_div);
L_div = L_shl(L_div, 2);
return (L_div);
}示例9: get_pq_polynomials
void get_pq_polynomials(
Word32 *f, /* Q23 */
Word16 *lsp) /* Q15 */
{
Word16 i, n, hi, lo;
Word16 index, offset, coslsp, c;
Word32 a0;
f[0] = L_mult(2048, 2048); // 1.0 Q23
for(i = 1; i <= LPCO ; i++)
f[i]= 0;
for(n=1; n<=(LPCO>>1); n++) {
/* cosine mapping */
index = shr(lsp[2*n-2],9); // Q6
offset = lsp[2*n-2]&(Word16)0x01ff; // Q9
a0 = L_mult(sub(costable[index+1], costable[index]), offset); // Q10
coslsp = add(costable[index], intround(L_shl(a0, 6))); // Q15 cos((double)PI*lsp[2*n-2])
c = coslsp; // Q14 c = 2. * cos((double)PI*lsp[2*n-2])
for(i = 2*n; i >= 2; i--) {
L_Extract(f[i-1], &hi, &lo);
f[i] = L_add(f[i], f[i-2]); // Q23 f[i] += f[i-2]
a0 = Mpy_32_16(hi, lo, c); // Q22
f[i] = L_sub(f[i], L_shl(a0,1)); // Q23 f[i] += f[i-2] - c*f[i-1];
}
f[1] = L_msu(f[1], c, 256); // Q23 f[1] -= c;
}
return;
}示例10: Get_lsp_pol
static void Get_lsp_pol(Word16 *lsp, Word32 *f)
{
Word16 i,j, hi, lo;
Word32 t0;
/* All computation in Q24 */
*f = L_mult(4096, 2048); /* f[0] = 1.0; in Q24 */
f++;
*f = L_msu((Word32)0, *lsp, 512); /* f[1] = -2.0 * lsp[0]; in Q24 */
f++;
lsp += 2; /* Advance lsp pointer */
for(i=2; i<=5; i++)
{
*f = f[-2];
for(j=1; j<i; j++, f--)
{
L_Extract(f[-1] ,&hi, &lo);
t0 = Mpy_32_16(hi, lo, *lsp); /* t0 = f[-1] * lsp */
t0 = L_shl(t0, 1);
*f = L_add(*f, f[-2]); /* *f += f[-2] */
*f = L_sub(*f, t0); /* *f -= t0 */
}
*f = L_msu(*f, *lsp, 512); /* *f -= lsp<<9 */
f += i; /* Advance f pointer */
lsp += 2; /* Advance lsp pointer */
}
return;
}示例11: cor_h_x_e
static void cor_h_x_e(
Word16 h[], /* (i) Q12 : impulse response of weighted synthesis filter */
Word16 x[], /* (i) Q0 : correlation between target and h[] */
Word16 dn[] /* (o) Q0 : correlation between target and h[] */
)
{
Word16 i, j, k;
Word32 s, y32[L_SUBFR], max, tot, L_tmp;
/* first keep the result on 32 bits and find absolute maximum */
tot = 5;
for (k=0; k<NB_TRACK; k++) {
max = 0;
for (i=k; i<L_SUBFR; i+=STEP) {
s = 0;
for (j=i; j<L_SUBFR; j++) s = L_mac(s, x[j], h[j-i]);
y32[i] = s;
s = L_abs(s);
L_tmp = L_sub(s, max);
if (L_tmp > (Word32)0) max = s;
}
tot = L_add(tot, L_shr(max, 1)); /* tot += (2.0 x max) / 4.0 */
}
/* Find the number of right shifts to do on y32[] so that */
/* 2.0 x sumation of all max of dn[] in each track not saturate. */
j = sub(norm_l(tot), 2); /* multiply tot by 4 */
for (i=0; i<L_SUBFR; i++) {
dn[i] = round(L_shl(y32[i], j));
}
return;
}示例12: LTP_flag_update
void LTP_flag_update (vadState2 * st, Word16 mode)
{
Word16 thresh;
Word16 hi1;
Word16 lo1;
Word32 Ltmp;
test(); test();
if ((sub(mode, MR475) == 0) || (sub(mode, MR515) == 0))
{
thresh = (Word16)(32768.0*0.55); move16();
}
else if (sub(mode, MR102) == 0)
{
thresh = (Word16)(32768.0*0.60); move16();
}
else
{
thresh = (Word16)(32768.0*0.65); move16();
}
L_Extract (st->L_R0, &hi1, &lo1);
Ltmp = Mpy_32_16(hi1, lo1, thresh); test();
if (L_sub(st->L_Rmax, Ltmp) > 0)
{
st->LTP_flag = TRUE; move16();
}
else
{
st->LTP_flag = FALSE; move16();
}
return;
}示例13: Lag_max
static Word16 Lag_max( /* output: lag found */
Word16 signal[], /* input : signal used to compute the open loop pitch */
Word16 L_frame, /* input : length of frame to compute pitch */
Word16 lag_max, /* input : maximum lag */
Word16 lag_min, /* input : minimum lag */
Word16 *cor_max) /* output: normalized correlation of selected lag */
{
Word16 i, j;
Word16 *p, *p1;
Word32 max, t0, L_temp;
Word16 max_h, max_l, ener_h, ener_l;
Word16 p_max;
max = MIN_32;
/* initialization used only to suppress Microsoft Visual C++ warnings */
p_max = lag_max;
for (i = lag_max; i >= lag_min; i--)
{
p = signal;
p1 = &signal[-i];
t0 = 0;
for (j=0; j<L_frame; j++, p++, p1++)
t0 = L_mac(t0, *p, *p1);
L_temp = L_sub(t0,max);
if (L_temp >= 0L)
{
max = t0;
p_max = i;
}
}
/* compute energy */
t0 = 0;
p = &signal[-p_max];
for(i=0; i<L_frame; i++, p++)
t0 = L_mac(t0, *p, *p);
/* 1/sqrt(energy), result in Q30 */
t0 = Inv_sqrt(t0);
/* max = max/sqrt(energy) */
/* This result will always be on 16 bits !! */
L_Extract(max, &max_h, &max_l);
L_Extract(t0, &ener_h, &ener_l);
t0 = Mpy_32(max_h, max_l, ener_h, ener_l);
*cor_max = extract_l(t0);
return(p_max);
}示例14: Cor_h_X
void Cor_h_X(
Word16 h[], /* (i) Q12 :Impulse response of filters */
Word16 X[], /* (i) :Target vector */
Word16 D[] /* (o) :Correlations between h[] and D[] */
/* Normalized to 13 bits */
)
{
Word16 i, j;
Word32 s, max, L_temp;
Word32 y32[L_SUBFR];
/* first keep the result on 32 bits and find absolute maximum */
max = 0;
for (i = 0; i < L_SUBFR; i++)
{
s = 0;
for (j = i; j < L_SUBFR; j++)
s = L_mac(s, X[j], h[j-i]);
y32[i] = s;
s = L_abs(s);
L_temp =L_sub(s,max);
if(L_temp>0L) {
max = s;
}
}
/* Find the number of right shifts to do on y32[] */
/* so that maximum is on 13 bits */
j = norm_l(max);
if( sub(j,16) > 0) {
j = 16;
}
j = sub(18, j);
if(j>=0)
{
for(i=0; i<L_SUBFR; i++) {
D[i] = extract_l( L_shr(y32[i], j) );
}
}
else
{
Word16 pj = abs_s(j);
for(i=0; i<L_SUBFR; i++) {
D[i] = extract_l( L_shr(y32[i], pj) );
}
}
return;
}示例15: select_ltp
/*----------------------------------------------------------------------------
* select_ltp : selects best of (gain1, gain2)
* with gain1 = num1 * 2** sh_num1 / den1 * 2** sh_den1
* and gain2 = num2 * 2** sh_num2 / den2 * 2** sh_den2
*----------------------------------------------------------------------------
*/
static Word16 select_ltp( /* output : 1 = 1st gain, 2 = 2nd gain */
Word16 num1, /* input : numerator of gain1 */
Word16 den1, /* input : denominator of gain1 */
Word16 sh_num1, /* input : just. factor for num1 */
Word16 sh_den1, /* input : just. factor for den1 */
Word16 num2, /* input : numerator of gain2 */
Word16 den2, /* input : denominator of gain2 */
Word16 sh_num2, /* input : just. factor for num2 */
Word16 sh_den2) /* input : just. factor for den2 */
{
Word32 L_temp1, L_temp2;
Word16 temp1, temp2;
Word16 hi, lo;
Word32 L_temp;
if(den2 == 0) {
return(1);
}
/* compares criteria = num**2/den */
L_temp1 = L_mult(num1, num1);
L_Extract(L_temp1, &hi, &lo);
L_temp1 = Mpy_32_16(hi, lo, den2);
L_temp2 = L_mult(num2, num2);
L_Extract(L_temp2, &hi, &lo);
L_temp2 = Mpy_32_16(hi, lo, den1);
/* temp1 = sh_den2 + 2 * sh_num1 */
temp1 = shl(sh_num1, 1);
temp1 = add(temp1, sh_den2);
/* temp2 = sh_den1 + 2 * sh_num2; */
temp2 = shl(sh_num2, 1);
temp2 = add(temp2, sh_den1);
if(sub(temp2 ,temp1)>0) {
temp2 = sub(temp2, temp1);
L_temp1 = L_shr(L_temp1, temp2); /* temp2 > 0 */
}
else {
if(sub(temp1 ,temp2) >0) {
temp1 = sub(temp1, temp2);
L_temp2 = L_shr(L_temp2, temp1); /* temp1 > 0 */
}
}
L_temp = L_sub(L_temp2,L_temp1);
if(L_temp>0L) {
return(2);
}
else {
return(1);
}
}