Lines Matching refs:lp_half_order
106 static void lsp2poly(int* f, const int16_t* lsp, int lp_half_order)
113 for(i=2; i<=lp_half_order; i++)
123 void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order)
129 lsp2poly(f1, lsp , lp_half_order);
130 lsp2poly(f2, lsp+1, lp_half_order);
134 for(i=1; i<lp_half_order+1; i++)
141 lp[(lp_half_order << 1) + 1 - i] = (ff1 - ff2) >> 11; // divide by 2 and (3.22) -> (3.12)
147 int lp_half_order = lp_order >> 1;
155 ff_lsp2polyf(lsp , pa, lp_half_order );
156 ff_lsp2polyf(lsp + 1, qa, lp_half_order - 1);
158 for (i = 1, j = lp_order - 1; i < lp_half_order; i++, j--) {
165 lp[lp_half_order - 1] = (1.0 + lsp[lp_order - 1]) *
166 pa[lp_half_order] * 0.5;
191 void ff_lsp2polyf(const double *lsp, double *f, int lp_half_order)
198 for(i=2; i<=lp_half_order; i++)
209 void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order)
212 float *lpc2 = lpc + (lp_half_order << 1) - 1;
214 av_assert2(lp_half_order <= MAX_LP_HALF_ORDER);
216 ff_lsp2polyf(lsp, pa, lp_half_order);
217 ff_lsp2polyf(lsp + 1, qa, lp_half_order);
219 while (lp_half_order--) {
220 double paf = pa[lp_half_order+1] + pa[lp_half_order];
221 double qaf = qa[lp_half_order+1] - qa[lp_half_order];
223 lpc [ lp_half_order] = 0.5*(paf+qaf);
224 lpc2[-lp_half_order] = 0.5*(paf-qaf);