*(tgt++) = (*(m1++)) * (*(m2++));
}
-static int pred(const float *in, float *tgt, int n)
+/**
+ * Converts autocorrelation coefficients to LPC coefficients using the
+ * Levinson-Durbin algorithm. See blocks 37 and 50 of the G.728 specification.
+ *
+ * @return 1 if success, 0 if fail
+ */
+static int eval_lpc_coeffs(const float *in, float *tgt, int n)
{
int x, y;
double f0, f1, f2;
do_hybrid_window(36, 40, 35, buffer1, temp1, glob->st1a, glob->st1b,
syn_window);
- if (pred(temp1, glob->st1, 36))
+ if (eval_lpc_coeffs(temp1, glob->st1, 36))
colmult(glob->pr1, glob->st1, table1a, 36);
memcpy(buffer2 , glob->history + 4, 4*sizeof(*buffer2));
do_hybrid_window(10, 8, 20, buffer2, temp2, glob->st2a, glob->st2b,
gain_window);
- if (pred(temp2, glob->st2, 10))
+ if (eval_lpc_coeffs(temp2, glob->st2, 10))
colmult(glob->pr2, glob->st2, table2a, 10);
}