hpf_f[0] = tmp;
}
}
+
+void ff_acelp_apply_order_2_transfer_function(float *buf,
+ const float zero_coeffs[2],
+ const float pole_coeffs[2],
+ float gain, float mem[2], int n)
+{
+ int i;
+ float tmp;
+
+ for (i = 0; i < n; i++) {
+ tmp = gain * buf[i] - pole_coeffs[0] * mem[0] - pole_coeffs[1] * mem[1];
+ buf[i] = tmp + zero_coeffs[0] * mem[0] + zero_coeffs[1] * mem[1];
+
+ mem[1] = mem[0];
+ mem[0] = tmp;
+ }
+}
void ff_acelp_high_pass_filter(int16_t* out, int hpf_f[2],
const int16_t* in, int length);
+/**
+ * Apply an order 2 rational transfer function in-place.
+ *
+ * @param samples [in/out]
+ * @param zero_coeffs z^-1 and z^-2 coefficients of the numerator
+ * @param pole_coeffs z^-1 and z^-2 coefficients of the denominator
+ * @param gain scale factor for final output
+ * @param mem intermediate values used by filter (should be 0 initially)
+ * @param n number of samples
+ */
+void ff_acelp_apply_order_2_transfer_function(float *samples,
+ const float zero_coeffs[2],
+ const float pole_coeffs[2],
+ float gain,
+ float mem[2], int n);
+
#endif /* AVCODEC_ACELP_FILTERS_H */