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;
}
void WebRtcG729fix_Lsp_Az(
int16_t lsp[], /* (i) Q15 : line spectral frequencies */
int16_t a[] /* (o) Q12 : predictor coefficients (order = 10) */
)
{
int16_t i;
int32_t f1[6], f2[6];
int32_t ff1, ff2, fff1, fff2;
Get_lsp_pol(&lsp[0],f1);
Get_lsp_pol(&lsp[1],f2);
a[0] = 4096;
for (i = 1; i <= 5; i++)
{
ff1 = WebRtcSpl_AddSatW32(f1[i], f1[i-1]); /* f1[i] += f1[i-1]; */
ff2 = WebRtcSpl_SubSatW32(f2[i], f2[i-1]); /* f2[i] -= f2[i-1]; */
fff1 = WebRtcSpl_AddSatW32(ff1, ff2); /* f1[i] + f2[i] */
fff2 = WebRtcSpl_SubSatW32(ff1, ff2); /* f1[i] - f2[i] */
a[i] = extract_l(L_shr_r(fff1, 13)); /* from Q24 to Q12 and * 0.5 */
a[11-i] = extract_l(L_shr_r(fff2, 13)); /* from Q24 to Q12 and * 0.5 */
}
}
void Lsp_Az(
Word16 lsp[], /* (i) : line spectral frequencies */
Word16 a[], /* (o) : predictor coefficients (order = 10) */
Flag *pOverflow /* (o) : overflow flag */
)
{
Word16 i;
Word16 j;
Word32 f1[6];
Word32 f2[6];
Word32 t0;
Word32 t1;
Word16 *p_a = &a[0];
Word32 *p_f1;
Word32 *p_f2;
Get_lsp_pol(&lsp[0], f1, pOverflow);
Get_lsp_pol(&lsp[1], f2, pOverflow);
p_f1 = &f1[5];
p_f2 = &f2[5];
for (i = 5; i > 0; i--)
{
*(p_f1--) += f1[i-1];
*(p_f2--) -= f2[i-1];
}
*(p_a++) = 4096;
p_f1 = &f1[1];
p_f2 = &f2[1];
for (i = 1, j = 10; i <= 5; i++, j--)
{
t0 = *(p_f1) + *(p_f2); /* f1[i] + f2[i] */
t1 = *(p_f1++) - *(p_f2++); /* f1[i] - f2[i] */
t0 = t0 + ((Word32) 1 << 12);
t1 = t1 + ((Word32) 1 << 12);
*(p_a++) = (Word16)(t0 >> 13);
a[j] = (Word16)(t1 >> 13);
}
return;
}
void Get_lsp_pol_wrapper(
Word16 *lsp,
Word32 *f,
Flag *pOverflow)
{
/*----------------------------------------------------------------------------
CALL Get_lsp_pol(lsp = lsp_ptr
f = f_ptr )
----------------------------------------------------------------------------*/
Get_lsp_pol(lsp, f, pOverflow);
/*----------------------------------------------------------------------------
MODIFYING(nothing)
RETURNING(nothing)
----------------------------------------------------------------------------*/
return;
}